Remove unused import.

Fixes #295

.envrc

@@ -1 +1,25 @@
-layout python3
+layout uv
+export LINE_PROFILE=1
+export MAIL_PASSWORD="ewacyay5seu2qske"
+export MAIL_PORT=587
+export MAIL_SERVER="smtp.fastmail.com"
+export MAIL_USERNAME="kae@midnighthax.com"
+export MAIL_USE_TLS=True
+export PYGAME_HIDE_SUPPORT_PROMPT=1
+
+branch=$(git branch --show-current)
+
+# Always treat running from /home/kae/mm as production
+if [ $(pwd) == /home/kae/mm ]; then
+        export MM_ENV="PRODUCTION"
+        export DATABASE_URL="mysql+mysqldb://musicmuster:musicmuster@localhost/musicmuster_prod"
+# on_git_branch is a direnv directive
+# See https://github.com/direnv/direnv/blob/master/man/direnv-stdlib.1.md
+elif on_git_branch master; then
+        export MM_ENV="PRODUCTION"
+        export DATABASE_URL="mysql+mysqldb://musicmuster:musicmuster@localhost/musicmuster_prod"
+else
+        export MM_ENV="DEVELOPMENT"
+        export DATABASE_URL="mysql+mysqldb://dev_musicmuster:dev_musicmuster@localhost/dev_musicmuster"
+        export PYTHONBREAKPOINT="pudb.set_trace"
+fi

.flake8

@@ -0,0 +1,13 @@
+[flake8]
+max-line-length = 88
+select = C,E,F,W,B,B950
+extend-ignore = E203, E501
+exclude =
+    .git
+    app/ui,
+    __pycache__,
+    archive,
+    migrations,
+    prof,
+    docs,
+    app/icons_rc.py

.gitattributes

@@ -0,0 +1 @@
+*.py diff=python

.gitignore

@@ -1,8 +1,8 @@
 .mypy_cache/
-*_ui.py
 *.pyc
 *.swp
 tags
+.venv/
 venv/
 Session.vim
 *.flac
@@ -11,3 +11,7 @@ StudioPlaylist.png
 *.otl
 *.howto
 .direnv
+tmp/
+.coverage
+profile_output*
+kae.py

.python-version

@@ -1 +1 @@
-musicmuster
+3.13

alembic.ini

@@ -1,18 +1,29 @@
-# A generic, single database configuration.
+# a multi-database configuration.
 
 [alembic]
+# this must be configured to point to the Alchemical database instance
+# there are two components separated by a colon:
+# the left part is the import path to the module containing the database instance
+# the right part is the name of the database instance, typically 'db'
+alchemical_db = models:db
+
 # path to migration scripts
 script_location = migrations
 
-# template used to generate migration files
-# file_template = %%(rev)s_%%(slug)s
+# template used to generate migration file names; The default value is %%(rev)s_%%(slug)s
+# Uncomment the line below if you want the files to be prepended with date and time
+# see https://alembic.sqlalchemy.org/en/latest/tutorial.html#editing-the-ini-file
+# for all available tokens
+# file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(hour).2d%%(minute).2d-%%(rev)s_%%(slug)s
 
 # sys.path path, will be prepended to sys.path if present.
 # defaults to the current working directory.
-prepend_sys_path = .
+prepend_sys_path = app
 
-# timezone to use when rendering the date
-# within the migration file as well as the filename.
+# timezone to use when rendering the date within the migration file
+# as well as the filename.
+# If specified, requires the python-dateutil library that can be
+# installed by adding `alembic[tz]` to the pip requirements
 # string value is passed to dateutil.tz.gettz()
 # leave blank for localtime
 # timezone =
@@ -30,28 +41,36 @@ prepend_sys_path = .
 # versions/ directory
 # sourceless = false
 
-# version location specification; this defaults
+# version location specification; This defaults
 # to migrations/versions.  When using multiple version
-# directories, initial revisions must be specified with --version-path
-# version_locations = %(here)s/bar %(here)s/bat migrations/versions
+# directories, initial revisions must be specified with --version-path.
+# The path separator used here should be the separator specified by "version_path_separator" below.
+# version_locations = %(here)s/bar:%(here)s/bat:migrations/versions
+
+# version path separator; As mentioned above, this is the character used to split
+# version_locations. The default within new alembic.ini files is "os", which uses os.pathsep.
+# If this key is omitted entirely, it falls back to the legacy behavior of splitting on spaces and/or commas.
+# Valid values for version_path_separator are:
+#
+# version_path_separator = :
+# version_path_separator = ;
+# version_path_separator = space
+version_path_separator = os  # Use os.pathsep. Default configuration used for new projects.
 
 # the output encoding used when revision files
 # are written from script.py.mako
 # output_encoding = utf-8
 
-sqlalchemy.url = mysql+mysqldb://songdb:songdb@localhost/musicmuster
-
-
 [post_write_hooks]
 # post_write_hooks defines scripts or Python functions that are run
 # on newly generated revision scripts.  See the documentation for further
 # detail and examples
 
 # format using "black" - use the console_scripts runner, against the "black" entrypoint
-# hooks=black
-# black.type=console_scripts
-# black.entrypoint=black
-# black.options=-l 79
+# hooks = black
+# black.type = console_scripts
+# black.entrypoint = black
+# black.options = -l 79 REVISION_SCRIPT_FILENAME
 
 # Logging configuration
 [loggers]

analyse_tracks.py

@@ -2,7 +2,7 @@
 
 import os
 
-from pydub import AudioSegment, effects
+from pydub import AudioSegment
 
 # DIR = "/home/kae/git/musicmuster/archive"
 DIR = "/home/kae/git/musicmuster"

app/audacity_controller.py

@@ -0,0 +1,155 @@
+# Standard library imports
+import os
+import psutil
+import socket
+import select
+from typing import Optional
+
+# PyQt imports
+
+# Third party imports
+
+# App imports
+from classes import ApplicationError
+from config import Config
+from log import log
+
+
+class AudacityController:
+    def __init__(
+        self,
+        method: str = "pipe",
+        socket_host: str = "localhost",
+        socket_port: int = 12345,
+        timeout: int = Config.AUDACITY_TIMEOUT_SECONDS,
+    ) -> None:
+        """
+        Initialize the AudacityController.
+        :param method: Communication method ('pipe' or 'socket').
+        :param socket_host: Host for socket connection (if using sockets).
+        :param socket_port: Port for socket connection (if using sockets).
+        :param timeout: Timeout in seconds for pipe operations.
+        """
+
+        self.method = method
+        self.path: Optional[str] = None
+        self.timeout = timeout
+        if method == "pipe":
+            user_uid = os.getuid()  # Get the user's UID
+            self.pipe_to = f"/tmp/audacity_script_pipe.to.{user_uid}"
+            self.pipe_from = f"/tmp/audacity_script_pipe.from.{user_uid}"
+        elif method == "socket":
+            self.socket_host = socket_host
+            self.socket_port = socket_port
+            self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+            try:
+                self.sock.connect((self.socket_host, self.socket_port))
+                self.sock.settimeout(self.timeout)
+            except socket.error as e:
+                raise ApplicationError(f"Failed to connect to Audacity socket: {e}")
+        else:
+            raise ApplicationError("Invalid method. Use 'pipe' or 'socket'.")
+
+        self._sanity_check()
+
+    def close(self):
+        """
+        Close the connection (for sockets).
+        """
+        if self.method == "socket":
+            self.sock.close()
+
+    def export(self) -> None:
+        """
+        Export file from Audacity
+        """
+
+        self._sanity_check()
+
+        select_status = self._send_command("SelectAll")
+        log.debug(f"{select_status=}")
+
+        # Escape any double quotes in filename
+        export_cmd = f'Export2: Filename="{self.path.replace('"', '\\"')}" NumChannels=2'
+        export_status = self._send_command(export_cmd)
+        log.debug(f"{export_status=}")
+        self.path = ""
+        if not export_status.startswith("Exported"):
+            raise ApplicationError(f"Error writing from Audacity: {export_status=}")
+
+    def open(self, path: str) -> None:
+        """
+        Open path in Audacity. Escape filename.
+        """
+
+        self._sanity_check()
+
+        escaped_path = path.replace('"', '\\"')
+        cmd = f'Import2: Filename="{escaped_path}"'
+        status = self._send_command(cmd)
+        self.path = path
+
+        log.debug(f"_open_in_audacity {path=}, {status=}")
+
+    def _sanity_check(self) -> None:
+        """
+        Check Audactity running and basic connectivity.
+        """
+
+        # Check Audacity is running
+        if "audacity" not in [i.name() for i in psutil.process_iter()]:
+            log.warning("Audactity not running")
+            raise ApplicationError("Audacity is not running")
+
+        # Check pipes exist
+        if self.method == "pipe":
+            if not (os.path.exists(self.pipe_to) and os.path.exists(self.pipe_from)):
+                raise ApplicationError(
+                    "AudacityController: Audacity pipes not found. Ensure scripting is enabled "
+                    f"and pipes exist at {self.pipe_to} and {self.pipe_from}."
+                )
+
+    def _test_connectivity(self) -> None:
+        """
+        Send test command to Audacity
+        """
+
+        response = self._send_command(Config.AUDACITY_TEST_COMMAND)
+        if response != Config.AUDACITY_TEST_RESPONSE:
+            raise ApplicationError(
+                "Error testing Audacity connectivity\n"
+                f"Sent: {Config.AUDACITY_TEST_COMMAND}"
+                f"Received: {response}"
+            )
+
+    def _send_command(self, command: str) -> str:
+        """
+        Send a command to Audacity.
+        :param command: Command to send (e.g., 'SelectAll').
+        :return: Response from Audacity.
+        """
+        log.debug(f"_send_command({command=})")
+
+        if self.method == "pipe":
+            try:
+                with open(self.pipe_to, "w") as to_pipe:
+                    to_pipe.write(command + "\n")
+                with open(self.pipe_from, "r") as from_pipe:
+                    ready, _, _ = select.select([from_pipe], [], [], self.timeout)
+                    if ready:
+                        response = from_pipe.readline()
+                    else:
+                        raise TimeoutError(
+                            f"Timeout waiting for response from {self.pipe_from}"
+                        )
+            except Exception as e:
+                raise RuntimeError(f"Error communicating with Audacity via pipes: {e}")
+        elif self.method == "socket":
+            try:
+                self.sock.sendall((command + "\n").encode("utf-8"))
+                response = self.sock.recv(1024).decode("utf-8")
+            except socket.timeout:
+                raise TimeoutError("Timeout waiting for response from Audacity socket.")
+            except Exception as e:
+                raise RuntimeError(f"Error communicating with Audacity via socket: {e}")
+        return response.strip()

app/classes.py

@@ -0,0 +1,154 @@
+# Standard library imports
+from __future__ import annotations
+
+from dataclasses import dataclass
+from enum import auto, Enum
+import functools
+import threading
+from typing import NamedTuple
+
+# Third party imports
+
+# PyQt imports
+from PyQt6.QtCore import (
+    pyqtSignal,
+    QObject,
+)
+from PyQt6.QtWidgets import (
+    QProxyStyle,
+    QStyle,
+    QStyleOption,
+)
+
+# App imports
+
+
+# Define singleton first as it's needed below
+def singleton(cls):
+    """
+    Make a class a Singleton class (see
+    https://realpython.com/primer-on-python-decorators/#creating-singletons)
+
+    Added locking.
+    """
+
+    lock = threading.Lock()
+
+    @functools.wraps(cls)
+    def wrapper_singleton(*args, **kwargs):
+        if wrapper_singleton.instance is None:
+            with lock:
+                if wrapper_singleton.instance is None:  # Check still None
+                    wrapper_singleton.instance = cls(*args, **kwargs)
+        return wrapper_singleton.instance
+
+    wrapper_singleton.instance = None
+    return wrapper_singleton
+
+
+class ApplicationError(Exception):
+    """
+    Custom exception
+    """
+
+    pass
+
+
+class AudioMetadata(NamedTuple):
+    start_gap: int = 0
+    silence_at: int = 0
+    fade_at: int = 0
+
+
+class Col(Enum):
+    START_GAP = 0
+    TITLE = auto()
+    ARTIST = auto()
+    INTRO = auto()
+    DURATION = auto()
+    START_TIME = auto()
+    END_TIME = auto()
+    LAST_PLAYED = auto()
+    BITRATE = auto()
+    NOTE = auto()
+
+
+class FileErrors(NamedTuple):
+    path: str
+    error: str
+
+
+@dataclass
+class Filter:
+    version: int = 1
+    path_type: str = "contains"
+    path: str = ""
+    last_played_number: int = 0
+    last_played_comparator: str = "before"
+    last_played_unit: str = "years"
+    duration_type: str = "longer than"
+    duration_number: int = 0
+    duration_unit: str = "minutes"
+
+
+@singleton
+@dataclass
+class MusicMusterSignals(QObject):
+    """
+    Class for all MusicMuster signals. See:
+     - https://zetcode.com/gui/pyqt5/eventssignals/
+     - https://stackoverflow.com/questions/62654525/emit-a-signal-from-another-class-to-main-class
+    """
+
+    begin_reset_model_signal = pyqtSignal(int)
+    enable_escape_signal = pyqtSignal(bool)
+    end_reset_model_signal = pyqtSignal(int)
+    next_track_changed_signal = pyqtSignal()
+    resize_rows_signal = pyqtSignal(int)
+    search_songfacts_signal = pyqtSignal(str)
+    search_wikipedia_signal = pyqtSignal(str)
+    show_warning_signal = pyqtSignal(str, str)
+    span_cells_signal = pyqtSignal(int, int, int, int, int)
+    status_message_signal = pyqtSignal(str, int)
+    track_ended_signal = pyqtSignal()
+
+    def __post_init__(self):
+        super().__init__()
+
+
+class PlaylistStyle(QProxyStyle):
+    def drawPrimitive(self, element, option, painter, widget=None):
+        """
+        Draw a line across the entire row rather than just the column
+        we're hovering over.
+        """
+        if (
+            element == QStyle.PrimitiveElement.PE_IndicatorItemViewItemDrop
+            and not option.rect.isNull()
+        ):
+            option_new = QStyleOption(option)
+            option_new.rect.setLeft(0)
+            if widget:
+                option_new.rect.setRight(widget.width())
+            option = option_new
+        super().drawPrimitive(element, option, painter, widget)
+
+
+class QueryCol(Enum):
+    TITLE = 0
+    ARTIST = auto()
+    DURATION = auto()
+    LAST_PLAYED = auto()
+    BITRATE = auto()
+
+
+class Tags(NamedTuple):
+    artist: str = ""
+    title: str = ""
+    bitrate: int = 0
+    duration: int = 0
+
+
+class TrackInfo(NamedTuple):
+    track_id: int
+    row_number: int

app/config.py

@@ -1,40 +1,145 @@
+# Standard library imports
+import datetime as dt
 import logging
 import os
 
+# PyQt imports
+
+# Third party imports
+
+# App imports
+
 
 class Config(object):
+    AUDACITY_TEST_COMMAND = "Message"
+    AUDACITY_TEST_RESPONSE = "Some message"
+    AUDACITY_TIMEOUT_SECONDS = 20
     AUDIO_SEGMENT_CHUNK_SIZE = 10
-    COLOUR_CURRENT_HEADER = "#d4edda"
-    COLOUR_CURRENT_PLAYLIST = "#28a745"
-    COLOUR_ODD_PLAYLIST = "#f2f2f2"
+    BITRATE_LOW_THRESHOLD = 192
+    BITRATE_OK_THRESHOLD = 300
+    COLOUR_BITRATE_LOW = "#ffcdd2"
+    COLOUR_BITRATE_MEDIUM = "#ffeb6f"
+    COLOUR_BITRATE_OK = "#dcedc8"
+    COLOUR_CURRENT_PLAYLIST = "#7eca8f"
+    COLOUR_CURRENT_TAB = "#248f24"
     COLOUR_ENDING_TIMER = "#dc3545"
     COLOUR_EVEN_PLAYLIST = "#d9d9d9"
-    COLOUR_NEXT_HEADER = "#fff3cd"
+    COLOUR_LABEL_TEXT = "#000000"
+    COLOUR_LONG_START = "#dc3545"
     COLOUR_NEXT_PLAYLIST = "#ffc107"
+    COLOUR_NEXT_TAB = "#b38600"
+    COLOUR_NORMAL_TAB = "#000000"
     COLOUR_NOTES_PLAYLIST = "#b8daff"
-    COLOUR_PREVIOUS_HEADER = "#f8d7da"
+    COLOUR_ODD_PLAYLIST = "#f2f2f2"
+    COLOUR_QUERYLIST_SELECTED = "#d3ffd3"
+    COLOUR_UNREADABLE = "#dc3545"
     COLOUR_WARNING_TIMER = "#ffc107"
-    DBFS_FADE = -12
     DBFS_SILENCE = -50
+    DEFAULT_COLUMN_WIDTH = 200
     DISPLAY_SQL = False
-    ERRORS_TO = ['kae@midnighthax.com']
-    FADE_STEPS = 20
-    FADE_TIME = 3000
-    LOG_LEVEL_STDERR = logging.DEBUG
+    DO_NOT_IMPORT = "Do not import"
+    ENGINE_OPTIONS = dict(pool_pre_ping=True)
+    # ENGINE_OPTIONS = dict(pool_pre_ping=True, echo=True)
+    EPOCH = dt.datetime(1970, 1, 1)
+    ERRORS_FROM = ["noreply@midnighthax.com"]
+    ERRORS_TO = ["kae@midnighthax.com"]
+    EXTERNAL_BROWSER_PATH = "/usr/bin/vivaldi"
+    FADE_CURVE_BACKGROUND = "lightyellow"
+    FADE_CURVE_FOREGROUND = "blue"
+    FADE_CURVE_MS_BEFORE_FADE = 5000
+    FADEOUT_DB = -10
+    FADEOUT_SECONDS = 5
+    FADEOUT_STEPS_PER_SECOND = 5
+    FILTER_DURATION_LONGER = "longer than"
+    FILTER_DURATION_MINUTES = "minutes"
+    FILTER_DURATION_SECONDS = "seconds"
+    FILTER_DURATION_SHORTER = "shorter than"
+    FILTER_PATH_CONTAINS = "contains"
+    FILTER_PATH_EXCLUDING = "excluding"
+    FILTER_PLAYED_COMPARATOR_ANYTIME = "Any time"
+    FILTER_PLAYED_COMPARATOR_BEFORE = "before"
+    FILTER_PLAYED_COMPARATOR_NEVER = "never"
+    FILTER_PLAYED_DAYS = "days"
+    FILTER_PLAYED_MONTHS = "months"
+    FILTER_PLAYED_WEEKS = "weeks"
+    FILTER_PLAYED_YEARS = "years"
+    FUZZYMATCH_MINIMUM_LIST = 60.0
+    FUZZYMATCH_MINIMUM_SELECT_ARTIST = 80.0
+    FUZZYMATCH_MINIMUM_SELECT_TITLE = 80.0
+    FUZZYMATCH_SHOW_SCORES = True
+    HEADER_ARTIST = "Artist"
+    HEADER_BITRATE = "bps"
+    HEADER_DURATION = "Length"
+    HEADER_END_TIME = "End"
+    HEADER_INTRO = "Intro"
+    HEADER_LAST_PLAYED = "Last played"
+    HEADER_NOTE = "Notes"
+    HEADER_START_GAP = "Gap"
+    HEADER_START_TIME = "Start"
+    HEADER_TITLE = "Title"
+    HIDE_AFTER_PLAYING_OFFSET = 5000
+    HIDE_PLAYED_MODE_SECTIONS = "SECTIONS"
+    HIDE_PLAYED_MODE_TRACKS = "TRACKS"
+    IMPORT_AS_NEW = "Import as new track"
+    INFO_TAB_TITLE_LENGTH = 15
+    INTRO_SECONDS_FORMAT = ".1f"
+    INTRO_SECONDS_WARNING_MS = 3000
+    LAST_PLAYED_TODAY_STRING = "Today"
+    LAST_PLAYED_TOOLTIP_DATE_FORMAT = "%a, %d %b %Y"
+    LOG_LEVEL_STDERR = logging.INFO
     LOG_LEVEL_SYSLOG = logging.DEBUG
     LOG_NAME = "musicmuster"
-    MAIL_PASSWORD = os.environ.get('MAIL_PASSWORD')
-    MAIL_PORT = int(os.environ.get('MAIL_PORT') or 25)
-    MAIL_SERVER = os.environ.get('MAIL_SERVER') or "woodlands.midnighthax.com"
-    MAIL_USERNAME = os.environ.get('MAIL_USERNAME')
-    MAIL_USE_TLS = os.environ.get('MAIL_USE_TLS') is not None
+    MAIL_PASSWORD = os.environ.get("MAIL_PASSWORD")
+    MAIL_PORT = int(os.environ.get("MAIL_PORT") or 25)
+    MAIL_SERVER = os.environ.get("MAIL_SERVER") or "woodlands.midnighthax.com"
+    MAIL_USERNAME = os.environ.get("MAIL_USERNAME")
+    MAIL_USE_TLS = os.environ.get("MAIL_USE_TLS") is not None
+    MAIN_WINDOW_TITLE = "MusicMuster"
+    MAX_IMPORT_MATCHES = 5
+    MAX_IMPORT_THREADS = 3
+    MAX_INFO_TABS = 5
+    MAX_MISSING_FILES_TO_REPORT = 10
     MILLISECOND_SIGFIGS = 0
-    MYSQL_CONNECT = "mysql+mysqldb://musicmuster:musicmuster@localhost/musicmuster"
-    NORMALISE_ON_IMPORT = True
-    ROOT = "/home/kae/music"
-    TESTMODE = True
-    TIMER_MS = 500
-    VOLUME_VLC_DEFAULT = 81
+    MINIMUM_ROW_HEIGHT = 30
+    NO_QUERY_NAME = "Select query"
+    NO_TEMPLATE_NAME = "None"
+    NOTE_TIME_FORMAT = "%H:%M"
+    OBS_HOST = "localhost"
+    OBS_PASSWORD = "auster"
+    OBS_PORT = 4455
+    PLAY_NEXT_GUARD_MS = 10000
+    PLAY_SETTLE = 500000
+    PLAYLIST_ICON_CURRENT = ":/icons/green-circle.png"
+    PLAYLIST_ICON_NEXT = ":/icons/yellow-circle.png"
+    PLAYLIST_ICON_TEMPLATE = ":/icons/redstar.png"
+    PREVIEW_ADVANCE_MS = 5000
+    PREVIEW_BACK_MS = 5000
+    PREVIEW_END_BUFFER_MS = 1000
+    REPLACE_FILES_DEFAULT_SOURCE = "/home/kae/music/Singles/tmp"
+    RESIZE_ROW_CHUNK_SIZE = 40
+    RETURN_KEY_DEBOUNCE_MS = 1000
+    ROOT = os.environ.get("ROOT") or "/home/kae/music"
+    ROW_PADDING = 4
+    ROWS_FROM_ZERO = True
+    SCROLL_TOP_MARGIN = 3
+    SECTION_ENDINGS = ("-", "+-", "-+")
+    SECTION_HEADER = "[Section header]"
+    SECTION_STARTS = ("+", "+-", "-+")
+    SONGFACTS_ON_NEXT = False
+    START_GAP_WARNING_THRESHOLD = 300
+    SUBTOTAL_ON_ROW_ZERO = "[No subtotal on first row]"
+    TOD_TIME_FORMAT = "%H:%M:%S"
+    TRACK_TIME_FORMAT = "%H:%M:%S"
+    VLC_MAIN_PLAYER_NAME = "MusicMuster Main Player"
+    VLC_PREVIEW_PLAYER_NAME = "MusicMuster Preview Player"
+    VLC_VOLUME_DEFAULT = 100
+    VLC_VOLUME_DROP3db = 70
+    WARNING_MS_BEFORE_FADE = 5500
+    WARNING_MS_BEFORE_SILENCE = 5500
+    WEB_ZOOM_FACTOR = 1.2
+    WIKIPEDIA_ON_NEXT = False
 
-
-config = Config
+    # These rely on earlier definitions
+    HIDE_PLAYED_MODE = HIDE_PLAYED_MODE_TRACKS
+    IMPORT_DESTINATION = os.path.join(ROOT, "Singles")
+    REPLACE_FILES_DEFAULT_DESTINATION = os.path.dirname(REPLACE_FILES_DEFAULT_SOURCE)

app/dbmanager.py

@@ -0,0 +1,31 @@
+# Standard library imports
+
+# PyQt imports
+
+# Third party imports
+from alchemical import Alchemical  # type:ignore
+
+# App imports
+
+
+class DatabaseManager:
+    """
+    Singleton class to ensure we only ever have one db object
+    """
+
+    __instance = None
+
+    def __init__(self, database_url: str, **kwargs: dict) -> None:
+        if DatabaseManager.__instance is None:
+            self.db = Alchemical(database_url, **kwargs)
+            # Database managed by Alembic so no create_all() required
+            # self.db.create_all()
+            DatabaseManager.__instance = self
+        else:
+            raise Exception("Attempted to create a second DatabaseManager instance")
+
+    @staticmethod
+    def get_instance(database_url: str, **kwargs: dict) -> Alchemical:
+        if DatabaseManager.__instance is None:
+            DatabaseManager(database_url, **kwargs)
+        return DatabaseManager.__instance

app/dbtables.py

@@ -0,0 +1,226 @@
+# Standard library imports
+from typing import Optional
+from dataclasses import asdict
+import datetime as dt
+import json
+
+# PyQt imports
+
+# Third party imports
+from alchemical import Model  # type: ignore
+from sqlalchemy import (
+    Boolean,
+    DateTime,
+    ForeignKey,
+    String,
+)
+from sqlalchemy.ext.associationproxy import association_proxy
+from sqlalchemy.ext.hybrid import hybrid_property
+from sqlalchemy.engine.interfaces import Dialect
+from sqlalchemy.orm import (
+    Mapped,
+    mapped_column,
+    relationship,
+)
+from sqlalchemy.types import TypeDecorator, TEXT
+
+# App imports
+from classes import Filter
+
+
+class JSONEncodedDict(TypeDecorator):
+    """
+    Custom JSON Type for MariaDB (since native JSON type is just LONGTEXT)
+    """
+
+    impl = TEXT
+
+    def process_bind_param(self, value: dict | None, dialect: Dialect) -> str | None:
+        """Convert Python dictionary to JSON string before saving."""
+        if value is None:
+            return None
+        return json.dumps(value, default=lambda o: o.__dict__)
+
+    def process_result_value(self, value: str | None, dialect: Dialect) -> dict | None:
+        """Convert JSON string back to Python dictionary after retrieval."""
+        if value is None:
+            return None
+        return json.loads(value)
+
+
+# Database classes
+class NoteColoursTable(Model):
+    __tablename__ = "notecolours"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    substring: Mapped[str] = mapped_column(String(256), index=True, unique=True)
+    colour: Mapped[str] = mapped_column(String(21), index=False)
+    enabled: Mapped[bool] = mapped_column(default=True, index=True)
+    foreground: Mapped[Optional[str]] = mapped_column(String(21), index=False)
+    is_regex: Mapped[bool] = mapped_column(default=False, index=False)
+    is_casesensitive: Mapped[bool] = mapped_column(default=False, index=False)
+    order: Mapped[Optional[int]] = mapped_column(index=True)
+    strip_substring: Mapped[bool] = mapped_column(default=True, index=False)
+
+    def __repr__(self) -> str:
+        return (
+            f"<NoteColours(id={self.id}, substring={self.substring}, "
+            f"colour={self.colour}>"
+        )
+
+
+class PlaydatesTable(Model):
+    __tablename__ = "playdates"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    lastplayed: Mapped[dt.datetime] = mapped_column(index=True)
+    track_id: Mapped[int] = mapped_column(ForeignKey("tracks.id", ondelete="CASCADE"))
+    track: Mapped["TracksTable"] = relationship(
+        "TracksTable",
+        back_populates="playdates",
+    )
+
+    def __repr__(self) -> str:
+        return (
+            f"<Playdates(id={self.id}, track_id={self.track_id} "
+            f"lastplayed={self.lastplayed}>"
+        )
+
+
+class PlaylistsTable(Model):
+    """
+    Manage playlists
+    """
+
+    __tablename__ = "playlists"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    name: Mapped[str] = mapped_column(String(32), unique=True)
+    last_used: Mapped[Optional[dt.datetime]] = mapped_column(DateTime, default=None)
+    tab: Mapped[Optional[int]] = mapped_column(default=None)
+    open: Mapped[bool] = mapped_column(default=False)
+    is_template: Mapped[bool] = mapped_column(default=False)
+    rows: Mapped[list["PlaylistRowsTable"]] = relationship(
+        "PlaylistRowsTable",
+        back_populates="playlist",
+        cascade="all, delete-orphan",
+        order_by="PlaylistRowsTable.row_number",
+    )
+    favourite: Mapped[bool] = mapped_column(
+        Boolean, nullable=False, index=False, default=False
+    )
+
+    def __repr__(self) -> str:
+        return (
+            f"<Playlists(id={self.id}, name={self.name}, "
+            f"is_templatee={self.is_template}, open={self.open}>"
+        )
+
+
+class PlaylistRowsTable(Model):
+    __tablename__ = "playlist_rows"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    row_number: Mapped[int] = mapped_column(index=True)
+    note: Mapped[str] = mapped_column(
+        String(2048), index=False, default="", nullable=False
+    )
+    playlist_id: Mapped[int] = mapped_column(
+        ForeignKey("playlists.id", ondelete="CASCADE"), index=True
+    )
+
+    playlist: Mapped[PlaylistsTable] = relationship(back_populates="rows")
+    track_id: Mapped[Optional[int]] = mapped_column(
+        ForeignKey("tracks.id", ondelete="CASCADE")
+    )
+    track: Mapped["TracksTable"] = relationship(
+        "TracksTable",
+        back_populates="playlistrows",
+    )
+    played: Mapped[bool] = mapped_column(
+        Boolean, nullable=False, index=False, default=False
+    )
+
+    def __repr__(self) -> str:
+        return (
+            f"<PlaylistRows(id={self.id}, playlist_id={self.playlist_id}, "
+            f"track_id={self.track_id}, "
+            f"note={self.note}, row_number={self.row_number}>"
+        )
+
+
+class QueriesTable(Model):
+    __tablename__ = "queries"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    name: Mapped[str] = mapped_column(String(128), nullable=False)
+    _filter_data: Mapped[dict | None] = mapped_column("filter_data", JSONEncodedDict, nullable=False)
+    favourite: Mapped[bool] = mapped_column(Boolean, nullable=False, index=False, default=False)
+
+    def _get_filter(self) -> Filter:
+        """Convert stored JSON dictionary to a Filter object."""
+        if isinstance(self._filter_data, dict):
+            return Filter(**self._filter_data)
+        return Filter()  # Default object if None or invalid data
+
+    def _set_filter(self, value: Filter | None) -> None:
+        """Convert a Filter object to JSON before storing."""
+        self._filter_data = asdict(value) if isinstance(value, Filter) else None
+
+    # Single definition of `filter`
+    filter = property(_get_filter, _set_filter)
+
+    def __repr__(self) -> str:
+        return f"<QueriesTable(id={self.id}, name={self.name}, filter={self.filter})>"
+
+
+class SettingsTable(Model):
+    """Manage settings"""
+
+    __tablename__ = "settings"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    name: Mapped[str] = mapped_column(String(64), unique=True)
+    f_datetime: Mapped[Optional[dt.datetime]] = mapped_column(default=None)
+    f_int: Mapped[Optional[int]] = mapped_column(default=None)
+    f_string: Mapped[Optional[str]] = mapped_column(String(128), default=None)
+
+    def __repr__(self) -> str:
+        return (
+            f"<Settings(id={self.id}, name={self.name}, "
+            f"f_datetime={self.f_datetime}, f_int={self.f_int}, f_string={self.f_string}>"
+        )
+
+
+class TracksTable(Model):
+    __tablename__ = "tracks"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    artist: Mapped[str] = mapped_column(String(256), index=True)
+    bitrate: Mapped[int] = mapped_column(default=None)
+    duration: Mapped[int] = mapped_column(index=True)
+    fade_at: Mapped[int] = mapped_column(index=False)
+    intro: Mapped[Optional[int]] = mapped_column(default=None)
+    path: Mapped[str] = mapped_column(String(2048), index=False, unique=True)
+    silence_at: Mapped[int] = mapped_column(index=False)
+    start_gap: Mapped[int] = mapped_column(index=False)
+    title: Mapped[str] = mapped_column(String(256), index=True)
+
+    playlistrows: Mapped[list[PlaylistRowsTable]] = relationship(
+        "PlaylistRowsTable",
+        back_populates="track",
+        cascade="all, delete-orphan",
+    )
+    playlists = association_proxy("playlistrows", "playlist")
+    playdates: Mapped[list[PlaydatesTable]] = relationship(
+        "PlaydatesTable",
+        back_populates="track",
+        cascade="all, delete-orphan",
+        lazy="joined",
+    )
+
+    def __repr__(self) -> str:
+        return (
+            f"<Track(id={self.id}, title={self.title}, "
+            f"artist={self.artist}, path={self.path}>"
+        )

app/dialogs.py

@@ -0,0 +1,231 @@
+# Standard library imports
+from typing import Optional
+
+# PyQt imports
+from PyQt6.QtCore import QEvent, Qt
+from PyQt6.QtGui import QKeyEvent
+from PyQt6.QtWidgets import (
+    QDialog,
+    QListWidgetItem,
+    QMainWindow,
+)
+
+# Third party imports
+from sqlalchemy.orm.session import Session
+
+# App imports
+from classes import MusicMusterSignals
+from helpers import (
+    ask_yes_no,
+    get_relative_date,
+    ms_to_mmss,
+)
+from log import log
+from models import Settings, Tracks
+from playlistmodel import PlaylistModel
+from ui import dlg_TrackSelect_ui
+
+
+class TrackSelectDialog(QDialog):
+    """Select track from database"""
+
+    def __init__(
+        self,
+        parent: QMainWindow,
+        session: Session,
+        new_row_number: int,
+        base_model: PlaylistModel,
+        add_to_header: Optional[bool] = False,
+        *args: Qt.WindowType,
+        **kwargs: Qt.WindowType,
+    ) -> None:
+        """
+        Subclassed QDialog to manage track selection
+        """
+
+        super().__init__(parent, *args, **kwargs)
+        self.session = session
+        self.new_row_number = new_row_number
+        self.base_model = base_model
+        self.add_to_header = add_to_header
+        self.ui = dlg_TrackSelect_ui.Ui_Dialog()
+        self.ui.setupUi(self)
+        self.ui.btnAdd.clicked.connect(self.add_selected)
+        self.ui.btnAddClose.clicked.connect(self.add_selected_and_close)
+        self.ui.btnClose.clicked.connect(self.close)
+        self.ui.matchList.itemDoubleClicked.connect(self.add_selected)
+        self.ui.matchList.itemSelectionChanged.connect(self.selection_changed)
+        self.ui.radioTitle.toggled.connect(self.title_artist_toggle)
+        self.ui.searchString.textEdited.connect(self.chars_typed)
+        self.track: Optional[Tracks] = None
+        self.signals = MusicMusterSignals()
+
+        record = Settings.get_setting(self.session, "dbdialog_width")
+        width = record.f_int or 800
+        record = Settings.get_setting(self.session, "dbdialog_height")
+        height = record.f_int or 600
+        self.resize(width, height)
+
+        if add_to_header:
+            self.ui.lblNote.setVisible(False)
+            self.ui.txtNote.setVisible(False)
+
+    def add_selected(self) -> None:
+        """Handle Add button"""
+
+        track = None
+
+        if self.ui.matchList.selectedItems():
+            item = self.ui.matchList.currentItem()
+            if item:
+                track = item.data(Qt.ItemDataRole.UserRole)
+
+        note = self.ui.txtNote.text()
+
+        if not (track or note):
+            return
+
+        track_id = None
+        if track:
+            track_id = track.id
+
+        if note and not track_id:
+            self.base_model.insert_row(self.new_row_number, track_id, note)
+            self.ui.txtNote.clear()
+            self.new_row_number += 1
+            return
+
+        self.ui.txtNote.clear()
+        self.select_searchtext()
+
+        if track_id is None:
+            log.error("track_id is None and should not be")
+            return
+
+        # Check whether track is already in playlist
+        move_existing = False
+        existing_prd = self.base_model.is_track_in_playlist(track_id)
+        if existing_prd is not None:
+            if ask_yes_no(
+                "Duplicate row",
+                "Track already in playlist. " "Move to new location?",
+                default_yes=True,
+            ):
+                move_existing = True
+
+        if self.add_to_header:
+            if move_existing and existing_prd:  # "and existing_prd" for mypy's benefit
+                self.base_model.move_track_to_header(
+                    self.new_row_number, existing_prd, note
+                )
+            else:
+                self.base_model.add_track_to_header(self.new_row_number, track_id)
+            # Close dialog - we can only add one track to a header
+            self.accept()
+        else:
+            # Adding a new track row
+            if move_existing and existing_prd:  # "and existing_prd" for mypy's benefit
+                self.base_model.move_track_add_note(
+                    self.new_row_number, existing_prd, note
+                )
+            else:
+                self.base_model.insert_row(self.new_row_number, track_id, note)
+
+        self.new_row_number += 1
+
+    def add_selected_and_close(self) -> None:
+        """Handle Add and Close button"""
+
+        self.add_selected()
+        self.accept()
+
+    def chars_typed(self, s: str) -> None:
+        """Handle text typed in search box"""
+
+        self.ui.matchList.clear()
+        if len(s) > 0:
+            if s.startswith("a/") and len(s) > 2:
+                matches = Tracks.search_artists(self.session, "%" + s[2:])
+            elif self.ui.radioTitle.isChecked():
+                matches = Tracks.search_titles(self.session, "%" + s)
+            else:
+                matches = Tracks.search_artists(self.session, "%" + s)
+            if matches:
+                for track in matches:
+                    last_played = None
+                    last_playdate = max(
+                        track.playdates, key=lambda p: p.lastplayed, default=None
+                    )
+                    if last_playdate:
+                        last_played = last_playdate.lastplayed
+                    t = QListWidgetItem()
+                    track_text = (
+                        f"{track.title} - {track.artist} "
+                        f"[{ms_to_mmss(track.duration)}] "
+                        f"({get_relative_date(last_played)})"
+                    )
+                    t.setText(track_text)
+                    t.setData(Qt.ItemDataRole.UserRole, track)
+                    self.ui.matchList.addItem(t)
+
+    def closeEvent(self, event: Optional[QEvent]) -> None:
+        """
+        Override close and save dialog coordinates
+        """
+
+        if not event:
+            return
+
+        record = Settings.get_setting(self.session, "dbdialog_height")
+        record.f_int = self.height()
+
+        record = Settings.get_setting(self.session, "dbdialog_width")
+        record.f_int = self.width()
+
+        self.session.commit()
+
+        event.accept()
+
+    def keyPressEvent(self, event: QKeyEvent | None) -> None:
+        """
+        Clear selection on ESC if there is one
+        """
+
+        if event and event.key() == Qt.Key.Key_Escape:
+            if self.ui.matchList.selectedItems():
+                self.ui.matchList.clearSelection()
+                return
+
+        super(TrackSelectDialog, self).keyPressEvent(event)
+
+    def select_searchtext(self) -> None:
+        """Select the searchbox"""
+
+        self.ui.searchString.selectAll()
+        self.ui.searchString.setFocus()
+
+    def selection_changed(self) -> None:
+        """Display selected track path in dialog box"""
+
+        if not self.ui.matchList.selectedItems():
+            return
+
+        item = self.ui.matchList.currentItem()
+        track = item.data(Qt.ItemDataRole.UserRole)
+        last_playdate = max(track.playdates, key=lambda p: p.lastplayed, default=None)
+        if last_playdate:
+            last_played = last_playdate.lastplayed
+        else:
+            last_played = None
+        path_text = f"{track.path} ({get_relative_date(last_played)})"
+
+        self.ui.dbPath.setText(path_text)
+
+    def title_artist_toggle(self) -> None:
+        """
+        Handle switching between searching for artists and searching for
+        titles
+        """
+
+        # Logic is handled already in chars_typed(), so just call that.
+        self.chars_typed(self.ui.searchString.text())

app/file_importer.py

@@ -0,0 +1,777 @@
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from fuzzywuzzy import fuzz  # type: ignore
+import os.path
+import threading
+from typing import Optional, Sequence
+import os
+import shutil
+
+# PyQt imports
+from PyQt6.QtCore import (
+    pyqtSignal,
+    QThread,
+)
+from PyQt6.QtWidgets import (
+    QButtonGroup,
+    QDialog,
+    QFileDialog,
+    QHBoxLayout,
+    QLabel,
+    QPushButton,
+    QRadioButton,
+    QVBoxLayout,
+)
+
+# Third party imports
+
+# App imports
+from classes import (
+    ApplicationError,
+    MusicMusterSignals,
+    singleton,
+    Tags,
+)
+from config import Config
+from helpers import (
+    audio_file_extension,
+    file_is_unreadable,
+    get_tags,
+    show_OK,
+)
+from log import log
+from models import db, Tracks
+from music_manager import track_sequence
+from playlistmodel import PlaylistModel
+import helpers
+
+
+@dataclass
+class ThreadData:
+    """
+    Data structure to hold details of the import thread context
+    """
+
+    base_model: PlaylistModel
+    row_number: int
+
+
+@dataclass
+class TrackFileData:
+    """
+    Data structure to hold details of file to be imported
+    """
+
+    source_path: str
+    tags: Tags = Tags()
+    destination_path: str = ""
+    import_this_file: bool = False
+    error: str = ""
+    file_path_to_remove: Optional[str] = None
+    track_id: int = 0
+    track_match_data: list[TrackMatchData] = field(default_factory=list)
+
+
+@dataclass
+class TrackMatchData:
+    """
+    Data structure to hold details of existing files that are similar to
+    the file being imported.
+    """
+
+    artist: str
+    artist_match: float
+    title: str
+    title_match: float
+    track_id: int
+
+
+@singleton
+class FileImporter:
+    """
+    Class to manage the import of new tracks. Sanity checks are carried
+    out before processing each track.
+
+    They may replace existing tracks, be imported as new tracks, or the
+    import may be skipped altogether. The user decides which of these in
+    the UI managed by the PickMatch class.
+
+    The actual import is handled by the DoTrackImport class.
+    """
+
+    # Place to keep a reference to importer workers. This is an instance
+    # variable to allow tests access. As this is a singleton, a class
+    # variable or an instance variable are effectively the same thing.
+    workers: dict[str, DoTrackImport] = {}
+
+    def __init__(self, base_model: PlaylistModel, row_number: int) -> None:
+        """
+        Initialise the FileImporter singleton instance.
+        """
+
+        log.debug(f"FileImporter.__init__({base_model=}, {row_number=})")
+
+        # Create ModelData
+        self.model_data = ThreadData(base_model=base_model, row_number=row_number)
+
+        # Data structure to track files to import
+        self.import_files_data: list[TrackFileData] = []
+
+        # Get signals
+        self.signals = MusicMusterSignals()
+
+    def _get_existing_tracks(self) -> Sequence[Tracks]:
+        """
+        Return a list of all existing Tracks
+        """
+
+        with db.Session() as session:
+            return Tracks.get_all(session)
+
+    def start(self) -> None:
+        """
+        Build a TrackFileData object for each new file to import, add it
+        to self.import_files_data, and trigger importing.
+        """
+
+        new_files: list[str] = []
+
+        if not os.listdir(Config.REPLACE_FILES_DEFAULT_SOURCE):
+            show_OK(
+                "File import",
+                f"No files in {Config.REPLACE_FILES_DEFAULT_SOURCE} to import",
+                None,
+            )
+            return
+
+        # Refresh list of existing tracks as they may have been updated
+        # by previous imports
+        self.existing_tracks = self._get_existing_tracks()
+
+        for infile in [
+            os.path.join(Config.REPLACE_FILES_DEFAULT_SOURCE, f)
+            for f in os.listdir(Config.REPLACE_FILES_DEFAULT_SOURCE)
+            if f.endswith((".mp3", ".flac"))
+        ]:
+            if infile in [a.source_path for a in self.import_files_data]:
+                log.debug(f"file_importer.start skipping {infile=}, already queued")
+            else:
+                new_files.append(infile)
+                self.import_files_data.append(self.populate_trackfiledata(infile))
+
+        # Tell user which files won't be imported and why
+        self.inform_user(
+            [
+                a
+                for a in self.import_files_data
+                if a.source_path in new_files and a.import_this_file is False
+            ]
+        )
+
+        # Remove do-not-import entries from queue
+        self.import_files_data[:] = [
+            a for a in self.import_files_data if a.import_this_file is not False
+        ]
+
+        # Start the import if necessary
+        log.debug(
+            f"Import files prepared: {[a.source_path for a in self.import_files_data]}"
+        )
+        self._import_next_file()
+
+    def populate_trackfiledata(self, path: str) -> TrackFileData:
+        """
+        Populate TrackFileData object for path:
+
+        - Validate file to be imported
+        - Find matches and similar files
+        - Get user choices for each import file
+        - Validate self.import_files_data integrity
+        - Tell the user which files won't be imported and why
+        - Import the files, one by one.
+        """
+
+        tfd = TrackFileData(source_path=path)
+
+        if self.check_file_readable(tfd):
+            if self.check_file_tags(tfd):
+                self.find_similar(tfd)
+                if len(tfd.track_match_data) > 1:
+                    self.sort_track_match_data(tfd)
+                selection = self.get_user_choices(tfd)
+                if self.process_selection(tfd, selection):
+                    if self.extension_check(tfd):
+                        if self.validate_file_data(tfd):
+                            tfd.import_this_file = True
+
+        return tfd
+
+    def check_file_readable(self, tfd: TrackFileData) -> bool:
+        """
+        Check file is readable.
+        Return True if it is.
+        Populate error and return False if not.
+        """
+
+        if file_is_unreadable(tfd.source_path):
+            tfd.import_this_file = False
+            tfd.error = f"{tfd.source_path} is unreadable"
+            return False
+
+        return True
+
+    def check_file_tags(self, tfd: TrackFileData) -> bool:
+        """
+        Add tags to tfd
+        Return True if successful.
+        Populate error and return False if not.
+        """
+
+        try:
+            tfd.tags = get_tags(tfd.source_path)
+        except ApplicationError as e:
+            tfd.import_this_file = False
+            tfd.error = f"of tag errors ({str(e)})"
+            return False
+
+        return True
+
+    def extension_check(self, tfd: TrackFileData) -> bool:
+        """
+        If we are replacing an existing file, check that the correct file
+        extension of the replacement file matches the existing file
+        extension and return True if it does (or if there is no exsting
+        file), else False.
+        """
+
+        if not tfd.file_path_to_remove:
+            return True
+
+        if tfd.file_path_to_remove.endswith(audio_file_extension(tfd.source_path)):
+            return True
+
+        tfd.error = (
+            f"Existing file ({tfd.file_path_to_remove}) has a different "
+            f"extension to replacement file ({tfd.source_path})"
+        )
+        return False
+
+    def find_similar(self, tfd: TrackFileData) -> None:
+        """
+        - Search title in existing tracks
+        - if score >= Config.FUZZYMATCH_MINIMUM_LIST:
+            - get artist score
+            - add TrackMatchData to self.import_files_data[path].track_match_data
+        """
+
+        title = tfd.tags.title
+        artist = tfd.tags.artist
+
+        for existing_track in self.existing_tracks:
+            title_score = self._get_match_score(title, existing_track.title)
+            if title_score >= Config.FUZZYMATCH_MINIMUM_LIST:
+                artist_score = self._get_match_score(artist, existing_track.artist)
+                tfd.track_match_data.append(
+                    TrackMatchData(
+                        artist=existing_track.artist,
+                        artist_match=artist_score,
+                        title=existing_track.title,
+                        title_match=title_score,
+                        track_id=existing_track.id,
+                    )
+                )
+
+    def sort_track_match_data(self, tfd: TrackFileData) -> None:
+        """
+        Sort matched tracks in artist-similarity order
+        """
+
+        tfd.track_match_data.sort(key=lambda x: x.artist_match, reverse=True)
+
+    def _get_match_score(self, str1: str, str2: str) -> float:
+        """
+        Return the score of how well str1 matches str2.
+        """
+
+        ratio = fuzz.ratio(str1, str2)
+        partial_ratio = fuzz.partial_ratio(str1, str2)
+        token_sort_ratio = fuzz.token_sort_ratio(str1, str2)
+        token_set_ratio = fuzz.token_set_ratio(str1, str2)
+
+        # Combine scores
+        combined_score = (
+            ratio * 0.25
+            + partial_ratio * 0.25
+            + token_sort_ratio * 0.25
+            + token_set_ratio * 0.25
+        )
+
+        return combined_score
+
+    def get_user_choices(self, tfd: TrackFileData) -> int:
+        """
+        Find out whether user wants to import this as a new track,
+        overwrite an existing track or not import it at all.
+
+        Return -1 (user cancelled) 0 (import as new) >0 (replace track id)
+        """
+
+        # Build a list of (track title and artist, track_id, track path)
+        choices: list[tuple[str, int, str]] = []
+
+        # First choices are always a) don't import 2) import as a new track
+        choices.append((Config.DO_NOT_IMPORT, -1, ""))
+        choices.append((Config.IMPORT_AS_NEW, 0, ""))
+
+        # New track details
+        new_track_description = f"{tfd.tags.title} ({tfd.tags.artist})"
+
+        # Select 'import as new' as default unless the top match is good
+        # enough
+        default = 1
+        track_match_data = tfd.track_match_data
+        if track_match_data:
+            if (
+                track_match_data[0].artist_match
+                >= Config.FUZZYMATCH_MINIMUM_SELECT_ARTIST
+                and track_match_data[0].title_match
+                >= Config.FUZZYMATCH_MINIMUM_SELECT_TITLE
+            ):
+                default = 2
+
+            for xt in track_match_data:
+                xt_description = f"{xt.title} ({xt.artist})"
+                if Config.FUZZYMATCH_SHOW_SCORES:
+                    xt_description += f" ({xt.title_match:.0f}%)"
+                existing_track_path = self._get_existing_track(xt.track_id).path
+                choices.append(
+                    (
+                        xt_description,
+                        xt.track_id,
+                        existing_track_path,
+                    )
+                )
+
+        dialog = PickMatch(
+            new_track_description=new_track_description,
+            choices=choices,
+            default=default,
+        )
+        if dialog.exec():
+            return dialog.selected_track_id
+        else:
+            return -1
+
+    def process_selection(self, tfd: TrackFileData, selection: int) -> bool:
+        """
+        Process selection from PickMatch
+        """
+
+        if selection < 0:
+            # User cancelled
+            tfd.import_this_file = False
+            tfd.error = "you asked not to import this file"
+            return False
+
+        elif selection > 0:
+            # Import and replace track
+            self.replace_file(tfd, track_id=selection)
+
+        else:
+            # Import as new
+            self.import_as_new(tfd)
+
+        return True
+
+    def replace_file(self, tfd: TrackFileData, track_id: int) -> None:
+        """
+        Set up to replace an existing file.
+        """
+
+        log.debug(f"replace_file({tfd=}, {track_id=})")
+
+        if track_id < 1:
+            raise ApplicationError(f"No track ID: replace_file({tfd=}, {track_id=})")
+
+        tfd.track_id = track_id
+
+        existing_track_path = self._get_existing_track(track_id).path
+        tfd.file_path_to_remove = existing_track_path
+
+        # If the existing file in the Config.IMPORT_DESTINATION
+        # directory, replace it with the imported file name; otherwise,
+        # use the existing file name. This so that we don't change file
+        # names from CDs, etc.
+
+        if os.path.dirname(existing_track_path) == Config.IMPORT_DESTINATION:
+            tfd.destination_path = os.path.join(
+                Config.IMPORT_DESTINATION, os.path.basename(tfd.source_path)
+            )
+        else:
+            tfd.destination_path = existing_track_path
+
+    def _get_existing_track(self, track_id: int) -> Tracks:
+        """
+        Lookup in existing track in the local cache and return it
+        """
+
+        existing_track_records = [a for a in self.existing_tracks if a.id == track_id]
+        if len(existing_track_records) != 1:
+            raise ApplicationError(
+                f"Internal error in _get_existing_track: {existing_track_records=}"
+            )
+
+        return existing_track_records[0]
+
+    def import_as_new(self, tfd: TrackFileData) -> None:
+        """
+        Set up to import as a new file.
+        """
+
+        tfd.destination_path = os.path.join(
+            Config.IMPORT_DESTINATION, os.path.basename(tfd.source_path)
+        )
+
+    def validate_file_data(self, tfd: TrackFileData) -> bool:
+        """
+        Check the data structures for integrity
+        Return True if all OK
+        Populate error and return False if not.
+        """
+
+        # Check tags
+        if not (tfd.tags.artist and tfd.tags.title):
+            raise ApplicationError(
+                f"validate_file_data: {tfd.tags=}, {tfd.source_path=}"
+            )
+
+        # Check file_path_to_remove
+        if tfd.file_path_to_remove and not os.path.exists(tfd.file_path_to_remove):
+            # File to remove is missing, but this isn't a major error. We
+            # may be importing to replace a deleted file.
+            tfd.file_path_to_remove = ""
+
+        # Check destination_path
+        if not tfd.destination_path:
+            raise ApplicationError(
+                f"validate_file_data: no destination path set ({tfd.source_path=})"
+            )
+
+        # If destination path is the same as file_path_to_remove, that's
+        # OK, otherwise if this is a new import then check that
+        # destination path doesn't already exists
+
+        if tfd.track_id == 0 and tfd.destination_path != tfd.file_path_to_remove:
+            while os.path.exists(tfd.destination_path):
+                msg = (
+                    "New import requested but default destination path"
+                    f" ({tfd.destination_path})"
+                    " already exists. Click OK and choose where to save this track"
+                )
+                show_OK(title="Desintation path exists", msg=msg, parent=None)
+                # Get output filename
+                pathspec = QFileDialog.getSaveFileName(
+                    None,
+                    "Save imported track",
+                    directory=Config.IMPORT_DESTINATION,
+                )
+                if pathspec:
+                    if pathspec == "":
+                        # User cancelled
+                        tfd.error = "You did not select a location to save this track"
+                        return False
+                    tfd.destination_path = pathspec[0]
+                else:
+                    tfd.error = "destination file already exists"
+                    return False
+            # The desintation path should not already exist in the
+            # database (becquse if it does, it points to a non-existent
+            # file). Check that because the path field in the database is
+            # unique and so adding a duplicate will give a db integrity
+            # error.
+            with db.Session() as session:
+                if Tracks.get_by_path(session, tfd.destination_path):
+                    tfd.error = (
+                        "Importing a new track but destination path already exists "
+                        f"in database ({tfd.destination_path})"
+                    )
+                    return False
+
+        # Check track_id
+        if tfd.track_id < 0:
+            raise ApplicationError(
+                f"validate_file_data: track_id < 0, {tfd.source_path=}"
+            )
+
+        return True
+
+    def inform_user(self, tfds: list[TrackFileData]) -> None:
+        """
+        Tell user about files that won't be imported
+        """
+
+        msgs: list[str] = []
+        for tfd in tfds:
+            msgs.append(
+                f"{os.path.basename(tfd.source_path)} will not be imported because {tfd.error}"
+            )
+        if msgs:
+            show_OK("File not imported", "\r\r".join(msgs))
+            log.debug("\r\r".join(msgs))
+
+    def _import_next_file(self) -> None:
+        """
+        Import the next file sequentially.
+
+        This is called when an import completes so will be called asynchronously.
+        Protect with a lock.
+        """
+
+        lock = threading.Lock()
+
+        with lock:
+            while len(self.workers) < Config.MAX_IMPORT_THREADS:
+                try:
+                    tfd = self.import_files_data.pop()
+                    filename = os.path.basename(tfd.source_path)
+                    log.debug(f"Processing {filename}")
+                    log.debug(
+                        f"remaining files: {[a.source_path for a in self.import_files_data]}"
+                    )
+                    self.signals.status_message_signal.emit(
+                        f"Importing {filename}", 10000
+                    )
+                    self._start_import(tfd)
+                except IndexError:
+                    log.debug("import_next_file: no files remaining in queue")
+                    break
+
+    def _start_import(self, tfd: TrackFileData) -> None:
+        """
+        Start thread to import track
+        """
+
+        filename = os.path.basename(tfd.source_path)
+        log.debug(f"_start_import({filename=})")
+
+        self.workers[tfd.source_path] = DoTrackImport(
+            import_file_path=tfd.source_path,
+            tags=tfd.tags,
+            destination_path=tfd.destination_path,
+            track_id=tfd.track_id,
+            file_path_to_remove=tfd.file_path_to_remove,
+        )
+        log.debug(f"{self.workers[tfd.source_path]=} created")
+
+        self.workers[tfd.source_path].import_finished.connect(
+            self.post_import_processing
+        )
+        self.workers[tfd.source_path].finished.connect(lambda: self.cleanup_thread(tfd))
+        self.workers[tfd.source_path].finished.connect(
+            self.workers[tfd.source_path].deleteLater
+        )
+
+        self.workers[tfd.source_path].start()
+
+    def cleanup_thread(self, tfd: TrackFileData) -> None:
+        """
+        Remove references to finished threads/workers to prevent leaks.
+        """
+
+        log.debug(f"cleanup_thread({tfd.source_path=})")
+
+        if tfd.source_path in self.workers:
+            del self.workers[tfd.source_path]
+        else:
+            log.error(f"Couldn't find {tfd.source_path=} in {self.workers.keys()=}")
+
+        log.debug(f"After cleanup_thread: {self.workers.keys()=}")
+
+    def post_import_processing(self, source_path: str, track_id: int) -> None:
+        """
+        If track already in playlist, refresh it else insert it
+        """
+
+        log.debug(f"post_import_processing({source_path=}, {track_id=})")
+
+        if self.model_data:
+            if self.model_data.base_model:
+                self.model_data.base_model.update_or_insert(
+                    track_id, self.model_data.row_number
+                )
+
+        # Process next file(s)
+        self._import_next_file()
+
+
+class DoTrackImport(QThread):
+    """
+    Class to manage the actual import of tracks in a thread.
+    """
+
+    import_finished = pyqtSignal(str, int)
+
+    def __init__(
+        self,
+        import_file_path: str,
+        tags: Tags,
+        destination_path: str,
+        track_id: int,
+        file_path_to_remove: Optional[str] = None,
+    ) -> None:
+        """
+        Save parameters
+        """
+
+        super().__init__()
+        self.import_file_path = import_file_path
+        self.tags = tags
+        self.destination_track_path = destination_path
+        self.track_id = track_id
+        self.file_path_to_remove = file_path_to_remove
+
+        self.signals = MusicMusterSignals()
+
+    def __repr__(self) -> str:
+        return f"<DoTrackImport(id={hex(id(self))}, import_file_path={self.import_file_path}"
+
+    def run(self) -> None:
+        """
+        Either create track objects from passed files or update exising track
+        objects.
+
+        And add to visible playlist or update playlist if track already present.
+        """
+
+        self.signals.status_message_signal.emit(
+            f"Importing {os.path.basename(self.import_file_path)}", 5000
+        )
+
+        # Get audio metadata in this thread rather than calling
+        # function to save interactive time
+        self.audio_metadata = helpers.get_audio_metadata(self.import_file_path)
+
+        # Remove old file if so requested
+        if self.file_path_to_remove and os.path.exists(self.file_path_to_remove):
+            os.unlink(self.file_path_to_remove)
+
+        # Move new file to destination
+        shutil.move(self.import_file_path, self.destination_track_path)
+
+        with db.Session() as session:
+            if self.track_id == 0:
+                # Import new track
+                try:
+                    track = Tracks(
+                        session,
+                        path=self.destination_track_path,
+                        **self.tags._asdict(),
+                        **self.audio_metadata._asdict(),
+                    )
+                except Exception as e:
+                    self.signals.show_warning_signal.emit(
+                        "Error importing track", str(e)
+                    )
+                    return
+            else:
+                track = session.get(Tracks, self.track_id)
+                if track:
+                    for key, value in self.tags._asdict().items():
+                        if hasattr(track, key):
+                            setattr(track, key, value)
+                    for key, value in self.audio_metadata._asdict().items():
+                        if hasattr(track, key):
+                            setattr(track, key, value)
+                    track.path = self.destination_track_path
+                else:
+                    log.error(f"Unable to retrieve {self.track_id=}")
+                    return
+            session.commit()
+
+            helpers.normalise_track(self.destination_track_path)
+
+            self.signals.status_message_signal.emit(
+                f"{os.path.basename(self.import_file_path)} imported", 10000
+            )
+            self.import_finished.emit(self.import_file_path, track.id)
+
+
+class PickMatch(QDialog):
+    """
+    Dialog for user to select which existing track to replace or to
+    import to a new track
+    """
+
+    def __init__(
+        self,
+        new_track_description: str,
+        choices: list[tuple[str, int, str]],
+        default: int,
+    ) -> None:
+        super().__init__()
+        self.new_track_description = new_track_description
+        self.default = default
+        self.init_ui(choices)
+        self.selected_track_id = -1
+
+    def init_ui(self, choices: list[tuple[str, int, str]]) -> None:
+        """
+        Set up dialog
+        """
+
+        self.setWindowTitle("New or replace")
+
+        layout = QVBoxLayout()
+
+        # Add instructions
+        instructions = (
+            f"Importing {self.new_track_description}.\n"
+            "Import as a new track or replace existing track?"
+        )
+        instructions_label = QLabel(instructions)
+        layout.addWidget(instructions_label)
+
+        # Create a button group for radio buttons
+        self.button_group = QButtonGroup()
+
+        # Add radio buttons for each item
+        for idx, (track_description, track_id, track_path) in enumerate(choices):
+            if (
+                track_sequence.current
+                and track_id
+                and track_sequence.current.track_id == track_id
+            ):
+                # Don't allow current track to be replaced
+                track_description = "(Currently playing) " + track_description
+                radio_button = QRadioButton(track_description)
+                radio_button.setDisabled(True)
+                self.button_group.addButton(radio_button, -1)
+            else:
+                radio_button = QRadioButton(track_description)
+                radio_button.setToolTip(track_path)
+                self.button_group.addButton(radio_button, track_id)
+            layout.addWidget(radio_button)
+
+            # Select the second item by default (import as new)
+            if idx == self.default:
+                radio_button.setChecked(True)
+
+        # Add OK and Cancel buttons
+        button_layout = QHBoxLayout()
+        ok_button = QPushButton("OK")
+        cancel_button = QPushButton("Cancel")
+        button_layout.addWidget(ok_button)
+        button_layout.addWidget(cancel_button)
+        layout.addLayout(button_layout)
+
+        self.setLayout(layout)
+
+        # Connect buttons to actions
+        ok_button.clicked.connect(self.on_ok)
+        cancel_button.clicked.connect(self.reject)
+
+    def on_ok(self):
+        # Get the ID of the selected button
+        self.selected_track_id = self.button_group.checkedId()
+        self.accept()

app/helpers.py

@@ -1,6 +1,298 @@
-def ms_to_mmss(ms, decimals=0, negative=False):
+# Standard library imports
+import datetime as dt
+from email.message import EmailMessage
+from typing import Optional
+import os
+import re
+import shutil
+import smtplib
+import ssl
+import tempfile
+
+# PyQt imports
+from PyQt6.QtWidgets import QInputDialog, QMainWindow, QMessageBox, QWidget
+
+# Third party imports
+import filetype
+from mutagen.flac import FLAC  # type: ignore
+from mutagen.mp3 import MP3  # type: ignore
+from pydub import AudioSegment, effects
+from pydub.utils import mediainfo
+from tinytag import TinyTag, TinyTagException  # type: ignore
+
+# App imports
+from classes import AudioMetadata, ApplicationError, Tags
+from config import Config
+from log import log
+from models import Tracks
+
+start_time_re = re.compile(r"@\d\d:\d\d")
+
+
+def ask_yes_no(
+    title: str,
+    question: str,
+    default_yes: bool = False,
+    parent: Optional[QMainWindow] = None,
+) -> bool:
+    """Ask question; return True for yes, False for no"""
+
+    dlg = QMessageBox(parent)
+    dlg.setWindowTitle(title)
+    dlg.setText(question)
+    dlg.setStandardButtons(
+        QMessageBox.StandardButton.Yes | QMessageBox.StandardButton.No
+    )
+    dlg.setIcon(QMessageBox.Icon.Question)
+    if default_yes:
+        dlg.setDefaultButton(QMessageBox.StandardButton.Yes)
+    button = dlg.exec()
+
+    return button == QMessageBox.StandardButton.Yes
+
+
+def audio_file_extension(fpath: str) -> str | None:
+    """
+    Return the correct extension for this type of file.
+    """
+
+    return filetype.guess(fpath).extension
+
+
+def fade_point(
+    audio_segment: AudioSegment,
+    fade_threshold: float = 0.0,
+    chunk_size: int = Config.AUDIO_SEGMENT_CHUNK_SIZE,
+) -> int:
+    """
+    Returns the millisecond/index of the point where the volume drops below
+    the maximum and doesn't get louder again.
+    audio_segment - the sdlg_search_database_uiegment to find silence in
+    fade_threshold - the upper bound for how quiet is silent in dFBS
+    chunk_size - chunk size for interating over the segment in ms
+    """
+
+    assert chunk_size > 0  # to avoid infinite loop
+
+    segment_length: int = audio_segment.duration_seconds * 1000  # ms
+    trim_ms = segment_length - chunk_size
+    max_vol = audio_segment.dBFS
+    if fade_threshold == 0:
+        fade_threshold = max_vol
+
+    while (
+        audio_segment[trim_ms: trim_ms + chunk_size].dBFS < fade_threshold
+        and trim_ms > 0
+    ):  # noqa W503
+        trim_ms -= chunk_size
+
+    # if there is no trailing silence, return lenght of track (it's less
+    # the chunk_size, but for chunk_size = 10ms, this may be ignored)
+    return int(trim_ms)
+
+
+def file_is_unreadable(path: Optional[str]) -> bool:
+    """
+    Returns True if passed path is readable, else False
+    """
+
+    if not path:
+        return True
+
+    return not os.access(path, os.R_OK)
+
+
+def get_audio_segment(path: str) -> Optional[AudioSegment]:
+    if not path.endswith(audio_file_extension(path)):
+        return None
+
+    try:
+        if path.endswith(".mp3"):
+            return AudioSegment.from_mp3(path)
+        elif path.endswith(".flac"):
+            return AudioSegment.from_file(path, "flac")  # type: ignore
+    except AttributeError:
+        return None
+
+    return None
+
+
+def get_embedded_time(text: str) -> Optional[dt.datetime]:
+    """Return datetime specified as @hh:mm in text"""
+
+    try:
+        match = start_time_re.search(text)
+    except TypeError:
+        return None
+    if not match:
+        return None
+
+    try:
+        return dt.datetime.strptime(match.group(0)[1:], Config.NOTE_TIME_FORMAT)
+    except ValueError:
+        return None
+
+
+def get_all_track_metadata(filepath: str) -> dict[str, str | int | float]:
+    """Return all track metadata"""
+
+    return (
+        get_audio_metadata(filepath)._asdict()
+        | get_tags(filepath)._asdict()
+        | dict(path=filepath)
+    )
+
+
+def get_audio_metadata(filepath: str) -> AudioMetadata:
+    """Return audio metadata"""
+
+    # Set start_gap, fade_at and silence_at
+    audio = get_audio_segment(filepath)
+    if not audio:
+        return AudioMetadata()
+    else:
+        return AudioMetadata(
+            start_gap=leading_silence(audio),
+            fade_at=int(
+                round(fade_point(audio) / 1000, Config.MILLISECOND_SIGFIGS) * 1000
+            ),
+            silence_at=int(
+                round(trailing_silence(audio) / 1000, Config.MILLISECOND_SIGFIGS) * 1000
+            ),
+        )
+
+
+def get_name(prompt: str, default: str = "") -> str | None:
+    """Get a name from the user"""
+
+    dlg = QInputDialog()
+    dlg.setInputMode(QInputDialog.InputMode.TextInput)
+    dlg.setLabelText(prompt)
+    while True:
+        if default:
+            dlg.setTextValue(default)
+        dlg.resize(500, 100)
+        ok = dlg.exec()
+        if ok:
+            return dlg.textValue()
+
+        return None
+
+
+def get_relative_date(
+    past_date: Optional[dt.datetime], reference_date: Optional[dt.datetime] = None
+) -> str:
+    """
+    Return how long before reference_date past_date is as string.
+
+    Params:
+        @past_date: datetime
+        @reference_date: datetime, defaults to current date and time
+
+        @return: string
+    """
+
+    if not past_date or past_date == Config.EPOCH:
+        return "Never"
+    if not reference_date:
+        reference_date = dt.datetime.now()
+
+    # Check parameters
+    if past_date > reference_date:
+        return "get_relative_date() past_date is after relative_date"
+
+    days: int
+    days_str: str
+    weeks: int
+    weeks_str: str
+
+    weeks, days = divmod((reference_date.date() - past_date.date()).days, 7)
+    if weeks == days == 0:
+        # Same day so return time instead
+        return Config.LAST_PLAYED_TODAY_STRING + " " + past_date.strftime("%H:%M")
+    if weeks == 1:
+        weeks_str = "week"
+    else:
+        weeks_str = "weeks"
+    if days == 1:
+        days_str = "day"
+    else:
+        days_str = "days"
+    return f"{weeks} {weeks_str}, {days} {days_str}"
+
+
+def get_tags(path: str) -> Tags:
+    """
+    Return a dictionary of title, artist, bitrate and duration-in-milliseconds.
+    """
+
+    try:
+        tag = TinyTag.get(path)
+    except FileNotFoundError:
+        raise ApplicationError(f"File not found: {path}")
+    except TinyTagException:
+        raise ApplicationError(f"Can't read tags in {path}")
+
+    if (
+        tag.title is None
+        or tag.artist is None
+        or tag.bitrate is None
+        or tag.duration is None
+    ):
+        raise ApplicationError(f"Missing tags in {path}")
+
+    return Tags(
+        title=tag.title,
+        artist=tag.artist,
+        bitrate=round(tag.bitrate),
+        duration=int(round(tag.duration, Config.MILLISECOND_SIGFIGS) * 1000),
+    )
+
+
+def leading_silence(
+    audio_segment: AudioSegment,
+    silence_threshold: int = Config.DBFS_SILENCE,
+    chunk_size: int = Config.AUDIO_SEGMENT_CHUNK_SIZE,
+) -> int:
+    """
+    Returns the millisecond/index that the leading silence ends.
+    audio_segment - the segment to find silence in
+    silence_threshold - the upper bound for how quiet is silent in dFBS
+    chunk_size - chunk size for interating over the segment in ms
+
+    https://github.com/jiaaro/pydub/blob/master/pydub/silence.py
+    """
+
+    trim_ms: int = 0  # ms
+    assert chunk_size > 0  # to avoid infinite loop
+    while audio_segment[
+        trim_ms : trim_ms + chunk_size
+    ].dBFS < silence_threshold and trim_ms < len(  # noqa W504
+        audio_segment
+    ):
+        trim_ms += chunk_size
+
+    # if there is no end it should return the length of the segment
+    return min(trim_ms, len(audio_segment))
+
+
+def ms_to_mmss(
+    ms: Optional[int],
+    decimals: int = 0,
+    negative: bool = False,
+    none: Optional[str] = None,
+) -> str:
+    """Convert milliseconds to mm:ss"""
+
+    minutes: int
+    remainder: int
+    seconds: float
+
     if not ms:
-        return "-"
+        if none:
+            return none
+        else:
+            return "-"
     sign = ""
     if ms < 0:
         if negative:
@@ -17,3 +309,149 @@ def ms_to_mmss(ms, decimals=0, negative=False):
         seconds = 59.0
 
     return f"{sign}{minutes:.0f}:{seconds:02.{decimals}f}"
+
+
+def normalise_track(path: str) -> None:
+    """Normalise track"""
+
+    # Check type
+    ftype = os.path.splitext(path)[1][1:]
+    if ftype not in ["mp3", "flac"]:
+        log.error(
+            f"helpers.normalise_track({path}): " f"File type {ftype} not implemented"
+        )
+
+    bitrate = mediainfo(path)["bit_rate"]
+    audio = get_audio_segment(path)
+    if not audio:
+        return
+
+    # Get current file gid, uid and permissions
+    stats = os.stat(path)
+    try:
+        # Copy original file
+        _, temp_path = tempfile.mkstemp()
+        shutil.copyfile(path, temp_path)
+    except Exception as err:
+        log.debug(f"helpers.normalise_track({path}): err1: {repr(err)}")
+        return
+
+    # Overwrite original file with normalised output
+    normalised = effects.normalize(audio)
+    try:
+        normalised.export(path, format=os.path.splitext(path)[1][1:], bitrate=bitrate)
+        # Fix up permssions and ownership
+        os.chown(path, stats.st_uid, stats.st_gid)
+        os.chmod(path, stats.st_mode)
+        # Copy tags
+        tag_handler: type[FLAC | MP3]
+        if ftype == "flac":
+            tag_handler = FLAC
+        elif ftype == "mp3":
+            tag_handler = MP3
+        else:
+            return
+        src = tag_handler(temp_path)
+        dst = tag_handler(path)
+        for tag in src:
+            dst[tag] = src[tag]
+        dst.save()
+    except Exception as err:
+        log.debug(f"helpers.normalise_track({path}): err2: {repr(err)}")
+        # Restore original file
+        shutil.copyfile(path, temp_path)
+    finally:
+        if os.path.exists(temp_path):
+            os.remove(temp_path)
+
+
+def remove_substring_case_insensitive(parent_string: str, substring: str) -> str:
+    """
+    Remove all instances of substring from parent string, case insensitively
+    """
+
+    # Convert both strings to lowercase for case-insensitive comparison
+    lower_parent = parent_string.lower()
+    lower_substring = substring.lower()
+
+    # Initialize the result string
+    result = parent_string
+
+    # Continue removing the substring until it's no longer found
+    while lower_substring in lower_parent:
+        # Find the index of the substring
+        index = lower_parent.find(lower_substring)
+
+        # Remove the substring
+        result = result[:index] + result[index + len(substring) :]
+
+        # Update the lowercase versions
+        lower_parent = result.lower()
+
+    return result
+
+
+def send_mail(to_addr: str, from_addr: str, subj: str, body: str) -> None:
+    # From https://docs.python.org/3/library/email.examples.html
+
+    # Create a text/plain message
+    msg = EmailMessage()
+    msg.set_content(body)
+
+    msg["Subject"] = subj
+    msg["From"] = from_addr
+    msg["To"] = to_addr
+
+    # Send the message via SMTP server.
+    context = ssl.create_default_context()
+    try:
+        s = smtplib.SMTP(host=Config.MAIL_SERVER, port=Config.MAIL_PORT)
+        if Config.MAIL_USE_TLS:
+            s.starttls(context=context)
+        if Config.MAIL_USERNAME and Config.MAIL_PASSWORD:
+            s.login(Config.MAIL_USERNAME, Config.MAIL_PASSWORD)
+        s.send_message(msg)
+    except Exception as e:
+        print(e)
+    finally:
+        s.quit()
+
+
+def set_track_metadata(track: Tracks) -> None:
+    """Set/update track metadata in database"""
+
+    audio_metadata = get_audio_metadata(track.path)
+    tags = get_tags(track.path)
+
+    for audio_key in AudioMetadata._fields:
+        setattr(track, audio_key, getattr(audio_metadata, audio_key))
+    for tag_key in Tags._fields:
+        setattr(track, tag_key, getattr(tags, tag_key))
+
+
+def show_OK(title: str, msg: str, parent: Optional[QWidget] = None) -> None:
+    """Display a message to user"""
+
+    dlg = QMessageBox(parent)
+    dlg.setIcon(QMessageBox.Icon.Information)
+    dlg.setWindowTitle(title)
+    dlg.setText(msg)
+    dlg.setStandardButtons(QMessageBox.StandardButton.Ok)
+
+    _ = dlg.exec()
+
+
+def show_warning(parent: Optional[QMainWindow], title: str, msg: str) -> None:
+    """Display a warning to user"""
+
+    QMessageBox.warning(parent, title, msg, buttons=QMessageBox.StandardButton.Cancel)
+
+
+def trailing_silence(
+    audio_segment: AudioSegment,
+    silence_threshold: int = -50,
+    chunk_size: int = Config.AUDIO_SEGMENT_CHUNK_SIZE,
+) -> int:
+    """Return fade point from start in milliseconds"""
+
+    return fade_point(audio_segment, silence_threshold, chunk_size)

app/icons_rc.py

@@ -1 +0,0 @@
-ui/icons_rc.py

app/jittermonitor.py

@@ -0,0 +1,56 @@
+from PyQt6.QtCore import QObject, QTimer, QElapsedTimer
+import logging
+import time
+
+from config import Config
+
+class EventLoopJitterMonitor(QObject):
+    def __init__(
+        self,
+        parent=None,
+        interval_ms: int = 20,
+        jitter_threshold_ms: int = 100,
+        log_cooldown_s: float = 1.0,
+    ):
+        super().__init__(parent)
+        self._interval = interval_ms
+        self._jitter_threshold = jitter_threshold_ms
+        self._log_cooldown_s = log_cooldown_s
+
+        self._timer = QTimer(self)
+        self._timer.setInterval(self._interval)
+        self._timer.timeout.connect(self._on_timeout)
+
+        self._elapsed = QElapsedTimer()
+        self._elapsed.start()
+        self._last = self._elapsed.elapsed()
+
+        # child logger: e.g. "musicmuster.jitter"
+        self._log = logging.getLogger(f"{Config.LOG_NAME}.jitter")
+        self._last_log_time = 0.0
+
+    def start(self) -> None:
+        self._timer.start()
+
+    def _on_timeout(self) -> None:
+        now_ms = self._elapsed.elapsed()
+        delta = now_ms - self._last
+        self._last = now_ms
+
+        if delta > (self._interval + self._jitter_threshold):
+            self._log_jitter(now_ms, delta)
+
+    def _log_jitter(self, now_ms: int, gap_ms: int) -> None:
+        now = time.monotonic()
+
+        # simple rate limit: only one log every log_cooldown_s
+        if now - self._last_log_time < self._log_cooldown_s:
+            return
+        self._last_log_time = now
+
+        self._log.warning(
+            "Event loop gap detected: t=%d ms, gap=%d ms (interval=%d ms)",
+            now_ms,
+            gap_ms,
+            self._interval,
+        )

app/log.py

@@ -1,96 +1,138 @@
-#!/usr/bin/python3
-
+#!/usr/bin/env python3
+# Standard library imports
+from collections import defaultdict
+from functools import wraps
 import logging
+import logging.config
 import logging.handlers
+import os
 import sys
 import traceback
+import yaml
 
+# PyQt imports
+from PyQt6.QtWidgets import QApplication, QMessageBox
+
+# Third party imports
+import stackprinter  # type: ignore
+
+# App imports
 from config import Config
+from classes import ApplicationError
+
+
+class FunctionFilter(logging.Filter):
+    """Filter to allow category-based logging to stderr."""
+
+    def __init__(self, module_functions: dict[str, list[str]]):
+        super().__init__()
+
+        self.modules: list[str] = []
+        self.functions: defaultdict[str, list[str]] = defaultdict(list)
+
+        if module_functions:
+            for module in module_functions.keys():
+                if module_functions[module]:
+                    for function in module_functions[module]:
+                        self.functions[module].append(function)
+                else:
+                    self.modules.append(module)
+
+    def filter(self, record: logging.LogRecord) -> bool:
+        if not getattr(record, "levelname", None) == "DEBUG":
+            # Only prcess DEBUG messages
+            return False
+
+        module = getattr(record, "module", None)
+        if not module:
+            # No module in record
+            return False
+
+        # Process if this is a module we're tracking
+        if module in self.modules:
+            return True
+
+        # Process if this is a function we're tracking
+        if getattr(record, "funcName", None) in self.functions[module]:
+            return True
+
+        return False
 
 
 class LevelTagFilter(logging.Filter):
-    "Add leveltag"
+    """Add leveltag"""
 
-    def filter(self, record):
+    def filter(self, record: logging.LogRecord) -> bool:
         # Extract the first character of the level name
         record.leveltag = record.levelname[0]
-
-        # We never actually filter messages out, just abuse filtering to add an
-        # extra field to the LogRecord
+        # We never actually filter messages out, just add an extra field
+        # to the LogRecord
         return True
 
 
+# Load YAML logging configuration
+with open("app/logging.yaml", "r") as f:
+    config = yaml.safe_load(f)
+    logging.config.dictConfig(config)
+
+# Get logger
 log = logging.getLogger(Config.LOG_NAME)
-log.setLevel(logging.DEBUG)
-
-# stderr
-stderr = logging.StreamHandler()
-stderr.setLevel(Config.LOG_LEVEL_STDERR)
-
-# syslog
-syslog = logging.handlers.SysLogHandler(address='/dev/log')
-syslog.setLevel(Config.LOG_LEVEL_SYSLOG)
-
-# Filter
-filter = LevelTagFilter()
-syslog.addFilter(filter)
-stderr.addFilter(filter)
-
-# create formatter and add it to the handlers
-stderr_fmt = logging.Formatter('[%(asctime)s] %(leveltag)s: %(message)s',
-                               datefmt='%H:%M:%S')
-syslog_fmt = logging.Formatter('[%(name)s] %(leveltag)s: %(message)s')
-stderr.setFormatter(stderr_fmt)
-syslog.setFormatter(syslog_fmt)
-
-# add the handlers to the log
-log.addHandler(stderr)
-log.addHandler(syslog)
 
 
-def log_uncaught_exceptions(ex_cls, ex, tb):
+def handle_exception(exc_type, exc_value, exc_traceback):
+    error = str(exc_value)
+    if issubclass(exc_type, ApplicationError):
+        log.error(error)
+    else:
+        # Handle unexpected errors (log and display)
+        error_msg = "".join(traceback.format_exception(exc_type, exc_value, exc_traceback))
 
-    print("\033[1;31;47m")
-    logging.critical(''.join(traceback.format_tb(tb)))
-    print("\033[1;37;40m")
-    logging.critical('{0}: {1}'.format(ex_cls, ex))
+        print(stackprinter.format(exc_value, suppressed_paths=['/.venv'], style='darkbg'))
+
+        msg = stackprinter.format(exc_value)
+        log.error(msg)
+        log.error(error_msg)
+        print("Critical error:", error_msg)  # Consider logging instead of print
+
+        if os.environ["MM_ENV"] == "PRODUCTION":
+            from helpers import send_mail
+
+            send_mail(
+                Config.ERRORS_TO,
+                Config.ERRORS_FROM,
+                "Exception (log_uncaught_exceptions) from musicmuster",
+                msg,
+            )
+    if QApplication.instance() is not None:
+        fname = os.path.split(exc_traceback.tb_frame.f_code.co_filename)[1]
+        msg = f"ApplicationError: {error}\nat {fname}:{exc_traceback.tb_lineno}"
+        QMessageBox.critical(None, "Application Error", msg)
 
 
-sys.excepthook = log_uncaught_exceptions
+def truncate_large(obj, limit=5):
+    """Helper to truncate large lists or other iterables."""
+    if isinstance(obj, (list, tuple, set)):
+        if len(obj) > limit:
+            return f"{type(obj).__name__}(len={len(obj)}, items={list(obj)[:limit]}...)"
+
+    return repr(obj)
 
 
-def DEBUG(msg):
-    log.debug(msg)
+def log_call(func):
+    @wraps(func)
+    def wrapper(*args, **kwargs):
+        args_repr = [truncate_large(a) for a in args]
+        kwargs_repr = [f"{k}={truncate_large(v)}" for k, v in kwargs.items()]
+        params_repr = ", ".join(args_repr + kwargs_repr)
+        log.debug(f"call {func.__name__}({params_repr})")
+        try:
+            result = func(*args, **kwargs)
+            log.debug(f"return {func.__name__}: {truncate_large(result)}")
+            return result
+        except Exception as e:
+            log.debug(f"exception in {func.__name__}: {e}")
+            raise
+    return wrapper
 
 
-def EXCEPTION(msg):
-    log.exception(msg, exc_info=True, stack_info=True)
-
-
-def ERROR(msg):
-    log.error(msg)
-
-
-def INFO(msg):
-    log.info(msg)
-
-
-if __name__ == "__main__":
-    DEBUG("hi debug")
-    ERROR("hi error")
-    INFO("hi info")
-    EXCEPTION("hi exception")
-
-    def f():
-        return g()
-
-    def g():
-        return h()
-
-    def h():
-        return i()
-
-    def i():
-        1 / 0
-
-    f()
+sys.excepthook = handle_exception

app/logging.yaml

@@ -0,0 +1,55 @@
+version: 1
+disable_existing_loggers: True
+
+formatters:
+  colored:
+    (): colorlog.ColoredFormatter
+    format: "%(log_color)s[%(asctime)s] %(filename)s.%(funcName)s:%(lineno)s %(blue)s%(message)s"
+    datefmt: "%H:%M:%S"
+  syslog:
+    format: "[%(name)s] %(filename)s:%(lineno)s %(leveltag)s: %(message)s"
+
+filters:
+  leveltag:
+    (): log.LevelTagFilter
+  category_filter:
+    (): log.FunctionFilter
+    module_functions:
+      # Optionally additionally log some debug calls to stderr
+      # log all debug calls in a module:
+      #    module-name: []
+      # log debug calls for some functions in a module:
+      #    module-name:
+      #    - function-name-1
+      #    - function-name-2
+      musicmuster:
+        - play_next
+      jittermonitor: []
+
+handlers:
+  stderr:
+    class: colorlog.StreamHandler
+    level: INFO
+    formatter: colored
+    filters: [leveltag]
+    stream: ext://sys.stderr
+
+  syslog:
+    class: logging.handlers.SysLogHandler
+    level: DEBUG
+    formatter: syslog
+    filters: [leveltag]
+    address: "/dev/log"
+
+  debug_stderr:
+    class: colorlog.StreamHandler
+    level: DEBUG
+    formatter: colored
+    filters: [leveltag, category_filter]
+    stream: ext://sys.stderr
+
+loggers:
+  musicmuster:
+    level: DEBUG
+    handlers: [stderr, syslog, debug_stderr]
+    propagate: false 

app/logging_tester.py

@@ -0,0 +1,29 @@
+#!/usr/bin/env python3
+from log import log
+
+
+# Testing
+def fa():
+    log.debug("fa Debug message")
+    log.info("fa Info message")
+    log.warning("fa Warning message")
+    log.error("fa Error message")
+    log.critical("fa Critical message")
+    print()
+
+
+def fb():
+    log.debug("fb Debug message")
+    log.info("fb Info message")
+    log.warning("fb Warning message")
+    log.error("fb Error message")
+    log.critical("fb Critical message")
+    print()
+
+
+def testing():
+    fa()
+    fb()
+
+
+testing()

app/menu.yaml

@@ -0,0 +1,104 @@
+menus:
+  - title: "&File"
+    actions:
+      - text: "Save as Template"
+        handler: "save_as_template"
+      - text: "Manage Templates"
+        handler: "manage_templates_wrapper"
+      - separator: true
+      - text: "Manage Queries"
+        handler: "manage_queries_wrapper"
+      - separator: true
+      - text: "Exit"
+        handler: "close"
+
+  - title: "&Playlist"
+    actions:
+      - text: "Open Playlist"
+        handler: "open_existing_playlist"
+        shortcut: "Ctrl+O"
+      - text: "New Playlist"
+        handler: "new_playlist_dynamic_submenu"
+        submenu: true
+      - text: "Close Playlist"
+        handler: "close_playlist_tab"
+      - text: "Rename Playlist"
+        handler: "rename_playlist"
+      - text: "Delete Playlist"
+        handler: "delete_playlist"
+      - separator: true
+      - text: "Insert Track"
+        handler: "insert_track"
+        shortcut: "Ctrl+T"
+      - text: "Select Track from Query"
+        handler: "query_dynamic_submenu"
+        submenu: true
+      - text: "Insert Section Header"
+        handler: "insert_header"
+        shortcut: "Ctrl+H"
+      - text: "Import Files"
+        handler: "import_files_wrapper"
+        shortcut: "Ctrl+Shift+I"
+      - separator: true
+      - text: "Mark for Moving"
+        handler: "mark_rows_for_moving"
+        shortcut: "Ctrl+C"
+      - text: "Paste"
+        handler: "paste_rows"
+        shortcut: "Ctrl+V"
+      - separator: true
+      - text: "Export Playlist"
+        handler: "export_playlist_tab"
+      - text: "Download CSV of Played Tracks"
+        handler: "download_played_tracks"
+      - separator: true
+      - text: "Select Duplicate Rows"
+        handler: "select_duplicate_rows"
+      - text: "Move Selected"
+        handler: "move_selected"
+      - text: "Move Unplayed"
+        handler: "move_unplayed"
+      - separator: true
+      - text: "Clear Selection"
+        handler: "clear_selection"
+        shortcut: "Esc"
+        store_reference: true  # So we can enable/disable later
+
+  - title: "&Music"
+    actions:
+      - text: "Set Next"
+        handler: "set_selected_track_next"
+        shortcut: "Ctrl+N"
+      - text: "Play Next"
+        handler: "play_next"
+        shortcut: "Return"
+      - text: "Fade"
+        handler: "fade"
+        shortcut: "Ctrl+Z"
+      - text: "Stop"
+        handler: "stop"
+        shortcut: "Ctrl+Alt+S"
+      - text: "Resume"
+        handler: "resume"
+        shortcut: "Ctrl+R"
+      - text: "Skip to Next"
+        handler: "play_next"
+        shortcut: "Ctrl+Alt+Return"
+      - separator: true
+      - text: "Search"
+        handler: "search_playlist"
+        shortcut: "/"
+      - text: "Search Title in Wikipedia"
+        handler: "lookup_row_in_wikipedia"
+        shortcut: "Ctrl+W"
+      - text: "Search Title in Songfacts"
+        handler: "lookup_row_in_songfacts"
+        shortcut: "Ctrl+S"
+
+  - title: "Help"
+    actions:
+      - text: "About"
+        handler: "about"
+      - text: "Debug"
+        handler: "debug"
+

app/model.py

@@ -1,469 +0,0 @@
-#!/usr/bin/python3
-
-import sqlalchemy
-
-from datetime import datetime
-from sqlalchemy.ext.declarative import declarative_base
-from sqlalchemy import (
-    Boolean,
-    Column,
-    DateTime,
-    Float,
-    ForeignKey,
-    Integer,
-    String,
-    func
-)
-from sqlalchemy.orm.exc import MultipleResultsFound, NoResultFound
-from sqlalchemy.orm import relationship, sessionmaker
-
-from config import Config
-from log import DEBUG, ERROR
-
-# Create session at the global level as per
-# https://docs.sqlalchemy.org/en/13/orm/session_basics.html
-
-# Set up database connection
-engine = sqlalchemy.create_engine(f"{Config.MYSQL_CONNECT}?charset=utf8",
-                                  encoding='utf-8',
-                                  echo=Config.DISPLAY_SQL,
-                                  pool_pre_ping=True)
-Base = declarative_base()
-Base.metadata.create_all(engine)
-
-# Create a Session factory
-Session = sessionmaker(bind=engine)
-
-
-# Database classes
-class Notes(Base):
-    __tablename__ = 'notes'
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    playlist_id = Column(Integer, ForeignKey('playlists.id'))
-    playlist = relationship("Playlists", back_populates="notes")
-    row = Column(Integer, nullable=False)
-    note = Column(String(256), index=False)
-
-    def __repr__(self):
-        return (
-            f"<Note(id={self.id}, row={self.row}, note={self.note}>"
-        )
-
-    @staticmethod
-    def add_note(session, playlist_id, row, text):
-        DEBUG(f"add_note(playlist_id={playlist_id}, row={row}, text={text})")
-        note = Notes()
-        note.playlist_id = playlist_id
-        note.row = row
-        note.note = text
-        session.add(note)
-        session.commit()
-        return note
-
-    @staticmethod
-    def delete_note(session, id):
-        DEBUG(f"delete_note(id={id}")
-
-        session.query(Notes).filter(Notes.id == id).delete()
-        session.commit()
-
-    # Not currently used 1 June 2021
-    # @staticmethod
-    # def get_note(session, id):
-    #     return session.query(Notes).filter(Notes.id == id).one()
-
-    @classmethod
-    def update_note(cls, session, id, row, text=None):
-        """
-        Update note details. If text=None, don't change text.
-        """
-
-        DEBUG(f"update_note(id={id}, row={row}, text={text})")
-
-        note = session.query(cls).filter(cls.id == id).one()
-        note.row = row
-        if text:
-            note.note = text
-        session.commit()
-
-
-class Playdates(Base):
-    __tablename__ = 'playdates'
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    lastplayed = Column(DateTime, index=True, default=None)
-    track_id = Column(Integer, ForeignKey('tracks.id'))
-    tracks = relationship("Tracks", back_populates="playdates")
-
-    @staticmethod
-    def add_playdate(session, track):
-        DEBUG(f"add_playdate(track={track})")
-        pd = Playdates()
-        pd.lastplayed = datetime.now()
-        pd.track_id = track.id
-        session.add(pd)
-        track.update_lastplayed()
-        session.commit()
-
-
-class Playlists(Base):
-    """
-    Usage:
-
-    pl = session.query(Playlists).filter(Playlists.id == 1).one()
-
-    pl
-    <Playlist(id=1, name=Default>
-
-    pl.tracks
-    [<__main__.PlaylistTracks at 0x7fcd20181c18>,
-     <__main__.PlaylistTracks at 0x7fcd20181c88>,
-     <__main__.PlaylistTracks at 0x7fcd20181be0>,
-     <__main__.PlaylistTracks at 0x7fcd20181c50>]
-
-    [a.tracks for a in pl.tracks]
-    [<Track(id=3992, title=Yesterday Man, artist=Various, path=/h[...]
-     <Track(id=2238, title=These Boots Are Made For Walkin', arti[...]
-     <Track(id=3837, title=Babe, artist=Various, path=/home/kae/m[...]
-     <Track(id=2332, title=Such Great Heights - Remastered, artis[...]]
-
-    glue = PlaylistTracks(row=5)
-
-    tr = session.query(Tracks).filter(Tracks.id == 676).one()
-
-    tr
-    <Track(id=676, title=Seven Nation Army, artist=White Stripes,
-    path=/home/kae/music/White Stripes/Elephant/01. Seven Nation Army.flac>
-
-    glue.track_id = tr.id
-
-    pl.tracks.append(glue)
-
-    session.commit()
-
-    [a.tracks for a in pl.tracks]
-    [<Track(id=3992, title=Yesterday Man, artist=Various, path=/h[...]
-     <Track(id=2238, title=These Boots Are Made For Walkin', arti[...]
-     <Track(id=3837, title=Babe, artist=Various, path=/home/kae/m[...]
-     <Track(id=2332, title=Such Great Heights - Remastered, artis[...]
-     <Track(id=676, title=Seven Nation Army, artist=White Stripes[...]]
-    """
-
-    __tablename__ = "playlists"
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    name = Column(String(32), nullable=False, unique=True)
-    last_used = Column(DateTime, default=None, nullable=True)
-    loaded = Column(Boolean, default=True)
-    notes = relationship("Notes",
-                         order_by="Notes.row",
-                         back_populates="playlist")
-    tracks = relationship("PlaylistTracks",
-                          order_by="PlaylistTracks.row",
-                          back_populates="playlists")
-
-    def __repr__(self):
-        return (f"<Playlist(id={self.id}, name={self.name}>")
-
-    def add_track(self, session, track, row=None):
-        """
-        Add track to playlist at given row.
-        If row=None, add to end of playlist
-        """
-
-        if not row:
-            row = PlaylistTracks.new_row(session, self.id)
-
-        glue = PlaylistTracks(row=row)
-        glue.track_id = track.id
-        self.tracks.append(glue)
-        session.commit()
-
-    def close(self, session):
-        "Record playlist as no longer loaded"
-
-        self.loaded = False
-        session.add(self)
-        session.commit()
-
-    @staticmethod
-    def get_all_closed_playlists(session):
-        "Returns a  list of all playlists not currently open"
-
-        return (
-            session.query(Playlists)
-            .filter(
-                (Playlists.loaded == False) |  # noqa E712
-                (Playlists.loaded == None)
-            )
-            .order_by(Playlists.last_used.desc())
-        ).all()
-
-    @staticmethod
-    def get_all_playlists(session):
-        "Returns a list of all playlists"
-
-        return session.query(Playlists).all()
-
-    @staticmethod
-    def get_last_used(session):
-        """
-        Return a list of playlists marked "loaded", ordered by loaded date.
-        """
-
-        return (
-            session.query(Playlists)
-            .filter(Playlists.loaded == True)   # noqa E712
-            .order_by(Playlists.last_used.desc())
-        ).all()
-
-    def get_notes(self):
-        return [a.note for a in self.notes]
-
-    @staticmethod
-    def get_playlist(session, playlist_id):
-        return (
-            session.query(Playlists)
-            .filter(
-                Playlists.id == playlist_id   # noqa E712
-            )
-        ).one()
-
-    def get_tracks(self):
-        return [a.tracks for a in self.tracks]
-
-    @staticmethod
-    def new(session, name):
-        DEBUG(f"Playlists.new(name={name})")
-        playlist = Playlists()
-        playlist.name = name
-        session.add(playlist)
-        session.commit()
-        return playlist
-
-    @staticmethod
-    def open(session, plid):
-        "Record playlist as loaded and used now"
-
-        p = session.query(Playlists).filter(Playlists.id == plid).one()
-        p.loaded = True
-        p.last_used = datetime.now()
-        session.commit()
-
-        return p
-
-
-class PlaylistTracks(Base):
-    __tablename__ = 'playlisttracks'
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    playlist_id = Column(Integer, ForeignKey('playlists.id'), primary_key=True)
-    track_id = Column(Integer, ForeignKey('tracks.id'), primary_key=True)
-    row = Column(Integer, nullable=False)
-    tracks = relationship("Tracks", back_populates="playlists")
-    playlists = relationship("Playlists", back_populates="tracks")
-
-    @staticmethod
-    def add_track(session, playlist_id, track_id, row):
-        DEBUG(
-            f"PlaylistTracks.add_track(playlist_id={playlist_id}, "
-            f"track_id={track_id}, row={row})"
-        )
-        plt = PlaylistTracks()
-        plt.playlist_id = playlist_id,
-        plt.track_id = track_id,
-        plt.row = row
-        session.add(plt)
-        session.commit()
-
-    @staticmethod
-    def move_track(session, from_playlist_id, row, to_playlist_id):
-        DEBUG(
-            "PlaylistTracks.move_tracks(from_playlist_id="
-            f"{from_playlist_id}, row={row}, "
-            f"to_playlist_id={to_playlist_id})"
-        )
-        new_row = (
-            session.query(func.max(PlaylistTracks.row)).filter(
-                PlaylistTracks.playlist_id == to_playlist_id).scalar()
-        ) + 1
-        record = session.query(PlaylistTracks).filter(
-            PlaylistTracks.playlist_id == from_playlist_id,
-            PlaylistTracks.row == row
-        ).one()
-        record.playlist_id = to_playlist_id
-        record.row = new_row
-        session.commit()
-
-    @staticmethod
-    def new_row(session, playlist_id):
-        "Return row number > largest existing row number"
-
-        last_row = session.query(func.max(PlaylistTracks.row)).one()[0]
-        return last_row + 1
-
-    @staticmethod
-    def remove_all_tracks(session, playlist_id):
-        """
-        Remove all tracks from passed playlist_id
-        """
-
-        session.query(PlaylistTracks).filter(
-            PlaylistTracks.playlist_id == playlist_id,
-        ).delete()
-        session.commit()
-
-    @staticmethod
-    def remove_track(session, playlist_id, row):
-        DEBUG(
-            f"PlaylistTracks.remove_track(playlist_id={playlist_id}, "
-            f"row={row})"
-        )
-        session.query(PlaylistTracks).filter(
-            PlaylistTracks.playlist_id == playlist_id,
-            PlaylistTracks.row == row
-        ).delete()
-        session.commit()
-
-    @staticmethod
-    def update_row_track(session, playlist_id, row, track_id):
-        DEBUG(
-            f"PlaylistTracks.update_track_row(playlist_id={playlist_id}, "
-            f"row={row}, track_id={track_id})"
-        )
-
-        try:
-            plt = session.query(PlaylistTracks).filter(
-                PlaylistTracks.playlist_id == playlist_id,
-                PlaylistTracks.row == row
-            ).one()
-        except MultipleResultsFound:
-            ERROR(
-                f"Multiple rows matched in query: "
-                f"PlaylistTracks.playlist_id == {playlist_id}, "
-                f"PlaylistTracks.row == {row}"
-            )
-            return
-        except NoResultFound:
-            ERROR(
-                f"No rows matched in query: "
-                f"PlaylistTracks.playlist_id == {playlist_id}, "
-                f"PlaylistTracks.row == {row}"
-            )
-            return
-
-        plt.track_id = track_id
-        session.commit()
-
-
-class Settings(Base):
-    __tablename__ = 'settings'
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    name = Column(String(32), nullable=False, unique=True)
-    f_datetime = Column(DateTime, default=None, nullable=True)
-    f_int = Column(Integer, default=None, nullable=True)
-    f_string = Column(String(128), default=None, nullable=True)
-
-    @classmethod
-    def get_int(cls, session, name):
-        try:
-            int_setting = session.query(cls).filter(
-                cls.name == name).one()
-        except NoResultFound:
-            int_setting = Settings()
-            int_setting.name = name
-            int_setting.f_int = None
-            session.add(int_setting)
-            session.commit()
-        return int_setting
-
-    def update(self, session, data):
-        for key, value in data.items():
-            assert hasattr(self, key)
-            setattr(self, key, value)
-        session.commit()
-
-
-class Tracks(Base):
-    __tablename__ = 'tracks'
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    title = Column(String(256), index=True)
-    artist = Column(String(256), index=True)
-    duration = Column(Integer, index=True)
-    start_gap = Column(Integer, index=False)
-    fade_at = Column(Integer, index=False)
-    silence_at = Column(Integer, index=False)
-    path = Column(String(2048), index=False, nullable=False)
-    mtime = Column(Float, index=True)
-    lastplayed = Column(DateTime, index=True, default=None)
-    playlists = relationship("PlaylistTracks", back_populates="tracks")
-    playdates = relationship("Playdates", back_populates="tracks")
-
-    def __repr__(self):
-        return (
-            f"<Track(id={self.id}, title={self.title}, "
-            f"artist={self.artist}, path={self.path}>"
-        )
-
-    @classmethod
-    def get_or_create(cls, session, path):
-        DEBUG(f"Tracks.get_or_create(path={path})")
-        try:
-            track = session.query(cls).filter(cls.path == path).one()
-        except NoResultFound:
-            track = Tracks()
-            track.path = path
-            session.add(track)
-        return track
-
-    @staticmethod
-    def get_duration(session, id):
-        try:
-            return session.query(
-                Tracks.duration).filter(Tracks.id == id).one()[0]
-        except NoResultFound:
-            ERROR(f"Can't find track id {id}")
-            return None
-
-    @staticmethod
-    def get_all_paths(session):
-        "Return a list of paths of all tracks"
-
-        return [a[0] for a in session.query(Tracks.path).all()]
-
-    @staticmethod
-    def get_path(session, id):
-        try:
-            return session.query(Tracks.path).filter(Tracks.id == id).one()[0]
-        except NoResultFound:
-            ERROR(f"Can't find track id {id}")
-            return None
-
-    @staticmethod
-    def get_track(session, id):
-        try:
-            DEBUG(f"Tracks.get_track(track_id={id})")
-            track = session.query(Tracks).filter(Tracks.id == id).one()
-            return track
-        except NoResultFound:
-            ERROR(f"get_track({id}): not found")
-            return None
-
-    @staticmethod
-    def search_titles(session, text):
-        return (
-            session.query(Tracks)
-            .filter(Tracks.title.ilike(f"%{text}%"))
-            .order_by(Tracks.title)
-        ).all()
-
-    @staticmethod
-    def track_from_id(session, id):
-        return session.query(Tracks).filter(
-            Tracks.id == id).one()
-
-    def update_lastplayed(self):
-        self.lastplayed = datetime.now()

app/models.py

@@ -0,0 +1,873 @@
+# Standard library imports
+from __future__ import annotations
+
+from typing import Optional, Sequence
+import datetime as dt
+import os
+import re
+import sys
+
+# PyQt imports
+
+# Third party imports
+from dogpile.cache import make_region
+from dogpile.cache.api import NO_VALUE
+from sqlalchemy import (
+    bindparam,
+    delete,
+    func,
+    select,
+    text,
+    update,
+)
+from sqlalchemy.exc import IntegrityError, ProgrammingError
+from sqlalchemy.orm.exc import NoResultFound
+from sqlalchemy.orm import joinedload, selectinload
+from sqlalchemy.orm.session import Session
+from sqlalchemy.engine.row import RowMapping
+
+# App imports
+from classes import ApplicationError, Filter
+from config import Config
+from dbmanager import DatabaseManager
+import dbtables
+from log import log
+
+
+# Establish database connection
+DATABASE_URL = os.environ.get("DATABASE_URL")
+if DATABASE_URL is None:
+    raise ValueError("DATABASE_URL is undefined")
+if "unittest" in sys.modules and "sqlite" not in DATABASE_URL:
+    raise ValueError("Unit tests running on non-Sqlite database")
+db = DatabaseManager.get_instance(DATABASE_URL, engine_options=Config.ENGINE_OPTIONS).db
+
+# Configure the cache region
+cache_region = make_region().configure(
+    'dogpile.cache.memory',  # Use in-memory caching for now (switch to Redis if needed)
+    expiration_time=600  # Cache expires after 10 minutes
+)
+
+
+def run_sql(session: Session, sql: str) -> Sequence[RowMapping]:
+    """
+    Run a sql string and return results
+    """
+
+    try:
+        return session.execute(text(sql)).mappings().all()
+    except ProgrammingError as e:
+        raise ApplicationError(e)
+
+
+# Database classes
+class NoteColours(dbtables.NoteColoursTable):
+
+    def __init__(
+        self,
+        session: Session,
+        substring: str,
+        colour: str,
+        enabled: bool = True,
+        is_regex: bool = False,
+        is_casesensitive: bool = False,
+        order: Optional[int] = 0,
+    ) -> None:
+        self.substring = substring
+        self.colour = colour
+        self.enabled = enabled
+        self.is_regex = is_regex
+        self.is_casesensitive = is_casesensitive
+        self.order = order
+
+        session.add(self)
+        session.commit()
+
+    @classmethod
+    def get_all(cls, session: Session) -> Sequence["NoteColours"]:
+        """
+        Return all records
+        """
+
+        cache_key = "note_colours_all"
+        cached_result = cache_region.get(cache_key)
+
+        if cached_result is not NO_VALUE:
+            return cached_result
+
+        # Query the database
+        result = session.scalars(
+            select(cls)
+            .where(
+                cls.enabled.is_(True),
+            )
+            .order_by(cls.order)
+        ).all()
+        cache_region.set(cache_key, result)
+
+        return result
+
+    @staticmethod
+    def get_colour(
+        session: Session, text: str, foreground: bool = False
+    ) -> str:
+        """
+        Parse text and return background (foreground if foreground==True) colour
+        string if matched, else None
+
+        """
+
+        if not text:
+            return ""
+
+        match = False
+        for rec in NoteColours.get_all(session):
+            if rec.is_regex:
+                flags = re.UNICODE
+                if not rec.is_casesensitive:
+                    flags |= re.IGNORECASE
+                p = re.compile(rec.substring, flags)
+                if p.match(text):
+                    match = True
+            else:
+                if rec.is_casesensitive:
+                    if rec.substring in text:
+                        match = True
+                else:
+                    if rec.substring.lower() in text.lower():
+                        match = True
+
+            if match:
+                if foreground:
+                    return rec.foreground or ""
+                else:
+                    return rec.colour
+        return ""
+
+    @staticmethod
+    def invalidate_cache() -> None:
+        """Invalidate dogpile cache"""
+
+        cache_region.delete("note_colours_all")
+
+
+class Playdates(dbtables.PlaydatesTable):
+    def __init__(
+        self, session: Session, track_id: int, when: Optional[dt.datetime] = None
+    ) -> None:
+        """Record that track was played"""
+
+        if not when:
+            self.lastplayed = dt.datetime.now()
+        else:
+            self.lastplayed = when
+        self.track_id = track_id
+        session.add(self)
+        session.commit()
+
+    @staticmethod
+    def last_playdates(
+        session: Session, track_id: int, limit: int = 5
+    ) -> Sequence["Playdates"]:
+        """
+        Return a list of the last limit playdates for this track, sorted
+        latest to earliest.
+        """
+
+        return session.scalars(
+            Playdates.select()
+            .where(Playdates.track_id == track_id)
+            .order_by(Playdates.lastplayed.desc())
+            .limit(limit)
+        ).all()
+
+    @staticmethod
+    def last_played(session: Session, track_id: int) -> dt.datetime:
+        """Return datetime track last played or None"""
+
+        last_played = session.execute(
+            select(Playdates.lastplayed)
+            .where(Playdates.track_id == track_id)
+            .order_by(Playdates.lastplayed.desc())
+            .limit(1)
+        ).first()
+
+        if last_played:
+            return last_played[0]
+        else:
+            # Should never be reached as we create record with a
+            # last_played value
+            return Config.EPOCH  # pragma: no cover
+
+    @staticmethod
+    def last_played_tracks(session: Session, limit: int = 5) -> Sequence["Playdates"]:
+        """
+        Return a list of the last limit tracks played, sorted
+        earliest to latest.
+        """
+
+        return session.scalars(
+            Playdates.select().order_by(Playdates.lastplayed.desc()).limit(limit)
+        ).all()
+
+    @staticmethod
+    def played_after(session: Session, since: dt.datetime) -> Sequence["Playdates"]:
+        """Return a list of Playdates objects since passed time"""
+
+        return session.scalars(
+            select(Playdates)
+            .where(Playdates.lastplayed >= since)
+            .order_by(Playdates.lastplayed)
+        ).all()
+
+
+class Playlists(dbtables.PlaylistsTable):
+    def __init__(self, session: Session, name: str, template_id: int) -> None:
+        """Create playlist with passed name"""
+
+        self.name = name
+        self.last_used = dt.datetime.now()
+        session.add(self)
+        session.commit()
+
+        # If a template is specified, copy from it
+        if template_id:
+            PlaylistRows.copy_playlist(session, template_id, self.id)
+
+    @staticmethod
+    def clear_tabs(session: Session, playlist_ids: list[int]) -> None:
+        """
+        Make all tab records NULL
+        """
+
+        session.execute(
+            update(Playlists).where((Playlists.id.in_(playlist_ids))).values(tab=None)
+        )
+
+    def close(self, session: Session) -> None:
+        """Mark playlist as unloaded"""
+
+        self.open = False
+        session.commit()
+
+    @classmethod
+    def get_all(cls, session: Session) -> Sequence["Playlists"]:
+        """Returns a list of all playlists ordered by last use"""
+
+        return session.scalars(
+            select(cls)
+            .filter(cls.is_template.is_(False))
+            .order_by(cls.last_used.desc())
+        ).all()
+
+    @classmethod
+    def get_all_templates(cls, session: Session) -> Sequence["Playlists"]:
+        """Returns a list of all templates ordered by name"""
+
+        return session.scalars(
+            select(cls).where(cls.is_template.is_(True)).order_by(cls.name)
+        ).all()
+
+    @classmethod
+    def get_favourite_templates(cls, session: Session) -> Sequence["Playlists"]:
+        """Returns a list of favourite templates ordered by name"""
+
+        return session.scalars(
+            select(cls)
+            .where(cls.is_template.is_(True), cls.favourite.is_(True))
+            .order_by(cls.name)
+        ).all()
+
+    @classmethod
+    def get_closed(cls, session: Session) -> Sequence["Playlists"]:
+        """Returns a list of all closed playlists ordered by last use"""
+
+        return session.scalars(
+            select(cls)
+            .filter(
+                cls.open.is_(False),
+                cls.is_template.is_(False),
+            )
+            .order_by(cls.last_used.desc())
+        ).all()
+
+    @classmethod
+    def get_open(cls, session: Session) -> Sequence[Optional["Playlists"]]:
+        """
+        Return a list of loaded playlists ordered by tab.
+        """
+
+        return session.scalars(
+            select(cls).where(cls.open.is_(True)).order_by(cls.tab)
+        ).all()
+
+    def mark_open(self) -> None:
+        """Mark playlist as loaded and used now"""
+
+        self.open = True
+        self.last_used = dt.datetime.now()
+
+    @staticmethod
+    def name_is_available(session: Session, name: str) -> bool:
+        """
+        Return True if no playlist of this name exists else false.
+        """
+
+        return (
+            session.execute(select(Playlists).where(Playlists.name == name)).first()
+            is None
+        )
+
+    def rename(self, session: Session, new_name: str) -> None:
+        """
+        Rename playlist
+        """
+
+        self.name = new_name
+        session.commit()
+
+    @staticmethod
+    def save_as_template(
+        session: Session, playlist_id: int, template_name: str
+    ) -> None:
+        """Save passed playlist as new template"""
+
+        template = Playlists(session, template_name, template_id=0)
+        if not template or not template.id:
+            return
+
+        template.is_template = True
+        session.commit()
+
+        PlaylistRows.copy_playlist(session, playlist_id, template.id)
+
+
+class PlaylistRows(dbtables.PlaylistRowsTable):
+    def __init__(
+        self,
+        session: Session,
+        playlist_id: int,
+        row_number: int,
+        note: str = "",
+        track_id: Optional[int] = None,
+    ) -> None:
+        """Create PlaylistRows object"""
+
+        self.playlist_id = playlist_id
+        self.track_id = track_id
+        self.row_number = row_number
+        self.note = note
+        session.add(self)
+        session.commit()
+
+    def append_note(self, extra_note: str) -> None:
+        """Append passed note to any existing note"""
+
+        current_note = self.note
+        if current_note:
+            self.note = current_note + "\n" + extra_note
+        else:
+            self.note = extra_note
+
+    @staticmethod
+    def copy_playlist(session: Session, src_id: int, dst_id: int) -> None:
+        """Copy playlist entries"""
+
+        src_rows = session.scalars(
+            select(PlaylistRows).filter(PlaylistRows.playlist_id == src_id)
+        ).all()
+
+        for plr in src_rows:
+            PlaylistRows(
+                session=session,
+                playlist_id=dst_id,
+                row_number=plr.row_number,
+                note=plr.note,
+                track_id=plr.track_id,
+            )
+
+    @classmethod
+    def deep_row(
+        cls, session: Session, playlist_id: int, row_number: int
+    ) -> "PlaylistRows":
+        """
+        Return a playlist row that includes full track and lastplayed data for
+        given playlist_id and row
+        """
+
+        stmt = (
+            select(PlaylistRows)
+            .options(joinedload(cls.track))
+            .where(
+                PlaylistRows.playlist_id == playlist_id,
+                PlaylistRows.row_number == row_number,
+            )
+            # .options(joinedload(Tracks.playdates))
+        )
+
+        return session.execute(stmt).unique().scalar_one()
+
+    @staticmethod
+    def delete_higher_rows(session: Session, playlist_id: int, maxrow: int) -> None:
+        """
+        Delete rows in given playlist that have a higher row number
+        than 'maxrow'
+        """
+
+        session.execute(
+            delete(PlaylistRows).where(
+                PlaylistRows.playlist_id == playlist_id,
+                PlaylistRows.row_number > maxrow,
+            )
+        )
+        session.commit()
+
+    @staticmethod
+    def delete_row(session: Session, playlist_id: int, row_number: int) -> None:
+        """
+        Delete passed row in given playlist.
+        """
+
+        session.execute(
+            delete(PlaylistRows).where(
+                PlaylistRows.playlist_id == playlist_id,
+                PlaylistRows.row_number == row_number,
+            )
+        )
+
+    @staticmethod
+    def fixup_rownumbers(session: Session, playlist_id: int) -> None:
+        """
+        Ensure the row numbers for passed playlist have no gaps
+        """
+
+        plrs = session.scalars(
+            select(PlaylistRows)
+            .where(PlaylistRows.playlist_id == playlist_id)
+            .order_by(PlaylistRows.row_number)
+        ).all()
+
+        for i, plr in enumerate(plrs):
+            plr.row_number = i
+
+        # Ensure new row numbers are available to the caller
+        session.commit()
+
+    @classmethod
+    def plrids_to_plrs(
+        cls, session: Session, playlist_id: int, plr_ids: list[int]
+    ) -> Sequence["PlaylistRows"]:
+        """
+        Take a list of PlaylistRows ids and return a list of corresponding
+        PlaylistRows objects
+        """
+
+        plrs = session.scalars(
+            select(cls)
+            .where(cls.playlist_id == playlist_id, cls.id.in_(plr_ids))
+            .order_by(cls.row_number)
+        ).all()
+
+        return plrs
+
+    @staticmethod
+    def get_last_used_row(session: Session, playlist_id: int) -> Optional[int]:
+        """Return the last used row for playlist, or None if no rows"""
+
+        return session.execute(
+            select(func.max(PlaylistRows.row_number)).where(
+                PlaylistRows.playlist_id == playlist_id
+            )
+        ).scalar_one()
+
+    @staticmethod
+    def get_track_plr(
+        session: Session, track_id: int, playlist_id: int
+    ) -> Optional["PlaylistRows"]:
+        """Return first matching PlaylistRows object or None"""
+
+        return session.scalars(
+            select(PlaylistRows)
+            .where(
+                PlaylistRows.track_id == track_id,
+                PlaylistRows.playlist_id == playlist_id,
+            )
+            .limit(1)
+        ).first()
+
+    @classmethod
+    def get_played_rows(
+        cls, session: Session, playlist_id: int
+    ) -> Sequence["PlaylistRows"]:
+        """
+        For passed playlist, return a list of rows that
+        have been played.
+        """
+
+        plrs = session.scalars(
+            select(cls)
+            .where(cls.playlist_id == playlist_id, cls.played.is_(True))
+            .order_by(cls.row_number)
+        ).all()
+
+        return plrs
+
+    @classmethod
+    def get_playlist_rows(
+        cls, session: Session, playlist_id: int
+    ) -> Sequence["PlaylistRows"]:
+        """
+        For passed playlist, return a list of rows.
+        """
+
+        stmt = (
+            select(cls)
+            .where(cls.playlist_id == playlist_id)
+            .options(selectinload(cls.track))
+            .order_by(cls.row_number)
+        )
+        plrs = session.execute(stmt).scalars().all()
+
+        return plrs
+
+    @classmethod
+    def get_rows_with_tracks(
+        cls,
+        session: Session,
+        playlist_id: int,
+    ) -> Sequence["PlaylistRows"]:
+        """
+        For passed playlist, return a list of rows that
+        contain tracks
+        """
+
+        query = select(cls).where(
+            cls.playlist_id == playlist_id, cls.track_id.is_not(None)
+        )
+        plrs = session.scalars((query).order_by(cls.row_number)).all()
+
+        return plrs
+
+    @classmethod
+    def get_unplayed_rows(
+        cls, session: Session, playlist_id: int
+    ) -> Sequence["PlaylistRows"]:
+        """
+        For passed playlist, return a list of playlist rows that
+        have not been played.
+        """
+
+        plrs = session.scalars(
+            select(cls)
+            .where(
+                cls.playlist_id == playlist_id,
+                cls.track_id.is_not(None),
+                cls.played.is_(False),
+            )
+            .order_by(cls.row_number)
+        ).all()
+
+        return plrs
+
+    @classmethod
+    def insert_row(
+        cls,
+        session: Session,
+        playlist_id: int,
+        new_row_number: int,
+        note: str = "",
+        track_id: Optional[int] = None,
+    ) -> "PlaylistRows":
+        cls.move_rows_down(session, playlist_id, new_row_number, 1)
+        return cls(
+            session,
+            playlist_id=playlist_id,
+            row_number=new_row_number,
+            note=note,
+            track_id=track_id,
+        )
+
+    @staticmethod
+    def move_rows_down(
+        session: Session, playlist_id: int, starting_row: int, move_by: int
+    ) -> None:
+        """
+        Create space to insert move_by additional rows by incremented row
+        number from starting_row to end of playlist
+        """
+
+        log.debug(f"(move_rows_down({playlist_id=}, {starting_row=}, {move_by=}")
+
+        session.execute(
+            update(PlaylistRows)
+            .where(
+                (PlaylistRows.playlist_id == playlist_id),
+                (PlaylistRows.row_number >= starting_row),
+            )
+            .values(row_number=PlaylistRows.row_number + move_by)
+        )
+
+    @staticmethod
+    def update_plr_row_numbers(
+        session: Session,
+        playlist_id: int,
+        sqla_map: list[dict[str, int]],
+    ) -> None:
+        """
+        Take a {plrid: row_number} dictionary and update the row numbers accordingly
+        """
+
+        # Update database. Ref:
+        # https://docs.sqlalchemy.org/en/20/tutorial/data_update.html#the-update-sql-expression-construct
+        stmt = (
+            update(PlaylistRows)
+            .where(
+                PlaylistRows.playlist_id == playlist_id,
+                PlaylistRows.id == bindparam("playlistrow_id"),
+            )
+            .values(row_number=bindparam("row_number"))
+        )
+        session.connection().execute(stmt, sqla_map)
+
+
+class Queries(dbtables.QueriesTable):
+    def __init__(
+        self,
+        session: Session,
+        name: str,
+        filter: dbtables.Filter,
+        favourite: bool = False,
+    ) -> None:
+        """Create new query"""
+
+        self.name = name
+        self.filter = filter
+        self.favourite = favourite
+        session.add(self)
+        session.commit()
+
+    @classmethod
+    def get_all(cls, session: Session) -> Sequence["Queries"]:
+        """Returns a list of all queries ordered by name"""
+
+        return session.scalars(select(cls).order_by(cls.name)).all()
+
+    @classmethod
+    def get_favourites(cls, session: Session) -> Sequence["Queries"]:
+        """Returns a list of favourite queries ordered by name"""
+
+        return session.scalars(
+            select(cls).where(cls.favourite.is_(True)).order_by(cls.name)
+        ).all()
+
+
+class Settings(dbtables.SettingsTable):
+    def __init__(self, session: Session, name: str) -> None:
+        self.name = name
+        session.add(self)
+        session.commit()
+
+    @classmethod
+    def get_setting(cls, session: Session, name: str) -> "Settings":
+        """Get existing setting or return new setting record"""
+
+        try:
+            return session.execute(select(cls).where(cls.name == name)).scalar_one()
+
+        except NoResultFound:
+            return Settings(session, name)
+
+
+class Tracks(dbtables.TracksTable):
+    def __init__(
+        self,
+        session: Session,
+        path: str,
+        title: str,
+        artist: str,
+        duration: int,
+        start_gap: int,
+        fade_at: int,
+        silence_at: int,
+        bitrate: int,
+    ) -> None:
+        self.path = path
+        self.title = title
+        self.artist = artist
+        self.bitrate = bitrate
+        self.duration = duration
+        self.start_gap = start_gap
+        self.fade_at = fade_at
+        self.silence_at = silence_at
+
+        try:
+            session.add(self)
+            session.commit()
+        except IntegrityError as error:
+            session.rollback()
+            log.error(f"Error ({error=}) importing track ({path=})")
+            raise ValueError(error)
+
+    @classmethod
+    def get_all(cls, session: Session) -> Sequence["Tracks"]:
+        """Return a list of all tracks"""
+
+        return session.scalars(select(cls)).unique().all()
+
+    @classmethod
+    def all_tracks_indexed_by_id(cls, session: Session) -> dict[int, Tracks]:
+        """
+        Return a dictionary of all tracks, keyed by title
+        """
+
+        result: dict[int, Tracks] = {}
+
+        for track in cls.get_all(session):
+            result[track.id] = track
+
+        return result
+
+    @classmethod
+    def exact_title_and_artist(
+        cls, session: Session, title: str, artist: str
+    ) -> Sequence["Tracks"]:
+        """
+        Search for exact but case-insensitive match of title and artist
+        """
+
+        return (
+            session.scalars(
+                select(cls)
+                .where(cls.title.ilike(title), cls.artist.ilike(artist))
+                .order_by(cls.title)
+            )
+            .unique()
+            .all()
+        )
+
+    @classmethod
+    def get_filtered_tracks(
+        cls, session: Session, filter: Filter
+    ) -> Sequence["Tracks"]:
+        """
+        Return tracks matching filter
+        """
+
+        query = select(cls)
+
+        # Path specification
+        if filter.path:
+            if filter.path_type == "contains":
+                query = query.where(cls.path.ilike(f"%{filter.path}%"))
+            elif filter.path_type == "excluding":
+                query = query.where(cls.path.notilike(f"%{filter.path}%"))
+            else:
+                raise ApplicationError(f"Can't process filter path ({filter=})")
+
+        # Duration specification
+        seconds_duration = filter.duration_number
+        if filter.duration_unit == Config.FILTER_DURATION_MINUTES:
+            seconds_duration *= 60
+        elif filter.duration_unit != Config.FILTER_DURATION_SECONDS:
+            raise ApplicationError(f"Can't process filter duration ({filter=})")
+
+        if filter.duration_type == Config.FILTER_DURATION_LONGER:
+            query = query.where(cls.duration >= seconds_duration)
+        elif filter.duration_unit == Config.FILTER_DURATION_SHORTER:
+            query = query.where(cls.duration <= seconds_duration)
+        else:
+            raise ApplicationError(f"Can't process filter duration type ({filter=})")
+
+        # Process comparator
+        if filter.last_played_comparator == Config.FILTER_PLAYED_COMPARATOR_NEVER:
+            # Select tracks that have never been played
+            query = query.outerjoin(Playdates, cls.id == Playdates.track_id).where(
+                Playdates.id.is_(None)
+            )
+        else:
+            # Last played specification
+            now = dt.datetime.now()
+            # Set sensible default, and correct for Config.FILTER_PLAYED_COMPARATOR_ANYTIME
+            before = now
+            # If not ANYTIME, set 'before' appropriates
+            if filter.last_played_comparator != Config.FILTER_PLAYED_COMPARATOR_ANYTIME:
+                if filter.last_played_unit == Config.FILTER_PLAYED_DAYS:
+                    before = now - dt.timedelta(days=filter.last_played_number)
+                elif filter.last_played_unit == Config.FILTER_PLAYED_WEEKS:
+                    before = now - dt.timedelta(days=7 * filter.last_played_number)
+                elif filter.last_played_unit == Config.FILTER_PLAYED_MONTHS:
+                    before = now - dt.timedelta(days=30 * filter.last_played_number)
+                elif filter.last_played_unit == Config.FILTER_PLAYED_YEARS:
+                    before = now - dt.timedelta(days=365 * filter.last_played_number)
+
+            subquery = (
+                select(
+                    Playdates.track_id,
+                    func.max(Playdates.lastplayed).label("max_last_played"),
+                )
+                .group_by(Playdates.track_id)
+                .subquery()
+            )
+            query = query.join(subquery, Tracks.id == subquery.c.track_id).where(
+                subquery.c.max_last_played < before
+            )
+
+        records = session.scalars(query).unique().all()
+
+        return records
+
+    @classmethod
+    def get_by_path(cls, session: Session, path: str) -> Optional["Tracks"]:
+        """
+        Return track with passed path, or None.
+        """
+
+        try:
+            return (
+                session.execute(select(Tracks).where(Tracks.path == path))
+                .unique()
+                .scalar_one()
+            )
+        except NoResultFound:
+            return None
+
+    @classmethod
+    def search_artists(cls, session: Session, text: str) -> Sequence["Tracks"]:
+        """
+        Search case-insenstively for artists containing str
+
+        The query performs an outer join with 'joinedload' to populate the results
+        from the Playdates table at the same time. unique() needed; see
+        https://docs.sqlalchemy.org/en/20/orm/queryguide/relationships.html#joined-eager-loading
+        """
+
+        return (
+            session.scalars(
+                select(cls)
+                .options(joinedload(Tracks.playdates))
+                .where(cls.artist.ilike(f"%{text}%"))
+                .order_by(cls.title)
+            )
+            .unique()
+            .all()
+        )
+
+    @classmethod
+    def search_titles(cls, session: Session, text: str) -> Sequence["Tracks"]:
+        """
+        Search case-insenstively for titles containing str
+
+        The query performs an outer join with 'joinedload' to populate the results
+        from the Playdates table at the same time. unique() needed; see
+        https://docs.sqlalchemy.org/en/20/orm/queryguide/relationships.html#joined-eager-loading
+        """
+        return (
+            session.scalars(
+                select(cls)
+                .options(joinedload(Tracks.playdates))
+                .where(cls.title.like(f"{text}%"))
+                .order_by(cls.title)
+            )
+            .unique()
+            .all()
+        )

app/music.py

@@ -1,154 +0,0 @@
-import os
-import threading
-import vlc
-
-from config import Config
-from datetime import datetime
-from time import sleep
-
-from log import DEBUG, ERROR
-
-
-class Music:
-    """
-    Manage the playing of music tracks
-    """
-
-    def __init__(self):
-        self.current_track_start_time = None
-        self.fading = False
-        self.VLC = vlc.Instance()
-        self.player = None
-        self.track_path = None
-        self.max_volume = Config.VOLUME_VLC_DEFAULT
-
-    def fade(self):
-        """
-        Fade the currently playing track.
-
-        The actual management of fading runs in its own thread so as not
-        to hold up the UI during the fade.
-        """
-
-        DEBUG("music.fade()")
-
-        if not self.playing():
-            return None
-
-        self.fading = True
-
-        thread = threading.Thread(target=self._fade)
-        thread.start()
-
-    def _fade(self):
-        """
-        Implementation of fading the current track in a separate thread.
-        """
-
-        DEBUG("music._fade()")
-
-        fade_time = Config.FADE_TIME / 1000
-        steps = Config.FADE_STEPS
-        sleep_time = fade_time / steps
-
-        # We reduce volume by one mesure first, then by two measures,
-        # then three, and so on.
-
-        # The sum of the arithmetic sequence 1, 2, 3, ..n is
-        # (n**2 + n) / 2
-        total_measures_count = (steps**2 + steps) / 2
-
-        # Take a copy of current player to allow another track to be
-        # started without interfering here
-        p = self.player
-        measures_to_reduce_by = 0
-        for i in range(1, steps + 1):
-            measures_to_reduce_by += i
-            volume_factor = 1 - (measures_to_reduce_by / total_measures_count)
-            p.audio_set_volume(int(self.max_volume * volume_factor))
-            sleep(sleep_time)
-
-        p.stop()
-        p.release()
-        self.fading = False
-
-    def get_playtime(self):
-        "Return elapsed play time"
-
-        if not self.player:
-            return None
-
-        return self.player.get_time()
-
-    def get_position(self):
-        "Return current position"
-
-        DEBUG("music.get_position")
-
-        return self.player.get_position()
-
-    def play(self, path):
-        """
-        Start playing the track at path.
-
-        Log and return if path not found.
-        """
-
-        DEBUG(f"music.play({path})")
-
-        if not os.access(path, os.R_OK):
-            ERROR(f"play({path}): path not found")
-            return
-
-        self.track_path = path
-
-        self.player = self.VLC.media_player_new(path)
-        self.player.audio_set_volume(self.max_volume)
-        self.player.play()
-        self.current_track_start_time = datetime.now()
-
-    def playing(self):
-        """
-        Return True if currently playing a track, else False
-
-        vlc.is_playing() returns True if track was faded out.
-        get_position seems more reliable.
-        """
-
-        if self.player:
-            if self.player.get_position() > 0 and self.player.is_playing():
-                return True
-
-        # We take a copy of the player when fading, so we could be
-        # playing in a fade nowFalse
-        return self.fading
-
-    def set_position(self, ms):
-        "Set current play time in milliseconds from start"
-
-        return self.player.set_time(ms)
-
-    def set_volume(self, volume):
-        "Set maximum volume used for player"
-
-        if not self.player:
-            return
-
-        self.max_volume = volume
-        self.player.audio_set_volume(volume)
-
-    def stop(self):
-        "Immediately stop playing"
-
-        DEBUG("music.stop()")
-
-        if not self.player:
-            return None
-
-        position = self.player.get_position()
-        self.player.stop()
-        self.player.release()
-        # Ensure we don't reference player after release
-        self.player = None
-
-        return position

app/music_manager.py

@@ -0,0 +1,724 @@
+# Standard library imports
+from __future__ import annotations
+
+import datetime as dt
+from time import sleep
+from typing import Optional
+
+# Third party imports
+# import line_profiler
+import numpy as np
+import pyqtgraph as pg  # type: ignore
+from sqlalchemy.orm.session import Session
+import vlc  # type: ignore
+
+# PyQt imports
+from PyQt6.QtCore import (
+    pyqtSignal,
+    QObject,
+    QThread,
+)
+from pyqtgraph import PlotWidget
+from pyqtgraph.graphicsItems.PlotDataItem import PlotDataItem  # type: ignore
+from pyqtgraph.graphicsItems.LinearRegionItem import LinearRegionItem  # type: ignore
+
+# App imports
+from classes import ApplicationError, MusicMusterSignals
+from config import Config
+import helpers
+from log import log
+from models import PlaylistRows
+from vlcmanager import VLCManager
+
+
+# Define the VLC callback function type
+# import ctypes
+# import platform
+# VLC logging is very noisy so comment out unless needed
+# VLC_LOG_CB = ctypes.CFUNCTYPE(
+#     None,
+#     ctypes.c_void_p,
+#     ctypes.c_int,
+#     ctypes.c_void_p,
+#     ctypes.c_char_p,
+#     ctypes.c_void_p,
+# )
+
+# # Determine the correct C library for vsnprintf based on the platform
+# if platform.system() == "Windows":
+#     libc = ctypes.CDLL("msvcrt")
+# elif platform.system() == "Linux":
+#     libc = ctypes.CDLL("libc.so.6")
+# elif platform.system() == "Darwin":  # macOS
+#     libc = ctypes.CDLL("libc.dylib")
+# else:
+#     raise OSError("Unsupported operating system")
+
+# # Define the vsnprintf function
+# libc.vsnprintf.argtypes = [
+#     ctypes.c_char_p,
+#     ctypes.c_size_t,
+#     ctypes.c_char_p,
+#     ctypes.c_void_p,
+# ]
+# libc.vsnprintf.restype = ctypes.c_int
+
+
+class _AddFadeCurve(QObject):
+    """
+    Initialising a fade curve introduces a noticeable delay so carry out in
+    a thread.
+    """
+
+    finished = pyqtSignal()
+
+    def __init__(
+        self,
+        rat: RowAndTrack,
+        track_path: str,
+        track_fade_at: int,
+        track_silence_at: int,
+    ) -> None:
+        super().__init__()
+        self.rat = rat
+        self.track_path = track_path
+        self.track_fade_at = track_fade_at
+        self.track_silence_at = track_silence_at
+
+    def run(self) -> None:
+        """
+        Create fade curve and add to PlaylistTrack object
+        """
+
+        fc = _FadeCurve(self.track_path, self.track_fade_at, self.track_silence_at)
+        if not fc:
+            log.error(f"Failed to create FadeCurve for {self.track_path=}")
+        else:
+            self.rat.fade_graph = fc
+        self.finished.emit()
+
+
+class _FadeCurve:
+    GraphWidget: Optional[PlotWidget] = None
+
+    def __init__(
+        self, track_path: str, track_fade_at: int, track_silence_at: int
+    ) -> None:
+        """
+        Set up fade graph array
+        """
+
+        audio = helpers.get_audio_segment(track_path)
+        if not audio:
+            log.error(f"FadeCurve: could not get audio for {track_path=}")
+            return None
+
+        # Start point of curve is Config.FADE_CURVE_MS_BEFORE_FADE
+        # milliseconds before fade starts to silence
+        self.start_ms: int = max(
+            0, track_fade_at - Config.FADE_CURVE_MS_BEFORE_FADE - 1
+        )
+        self.end_ms: int = track_silence_at
+        audio_segment = audio[self.start_ms : self.end_ms]
+        self.graph_array = np.array(audio_segment.get_array_of_samples())
+
+        # Calculate the factor to map milliseconds of track to array
+        self.ms_to_array_factor = len(self.graph_array) / (self.end_ms - self.start_ms)
+
+        self.curve: Optional[PlotDataItem] = None
+        self.region: Optional[LinearRegionItem] = None
+
+    def clear(self) -> None:
+        """Clear the current graph"""
+
+        if self.GraphWidget:
+            self.GraphWidget.clear()
+
+    def plot(self) -> None:
+        if self.GraphWidget:
+            self.curve = self.GraphWidget.plot(self.graph_array)
+            if self.curve:
+                self.curve.setPen(Config.FADE_CURVE_FOREGROUND)
+            else:
+                log.debug("_FadeCurve.plot: no curve")
+        else:
+            log.debug("_FadeCurve.plot: no GraphWidget")
+
+    def tick(self, play_time: int) -> None:
+        """Update volume fade curve"""
+
+        if not self.GraphWidget:
+            return
+
+        ms_of_graph = play_time - self.start_ms
+        if ms_of_graph < 0:
+            return
+
+        if self.region is None:
+            # Create the region now that we're into fade
+            self.region = pg.LinearRegionItem([0, 0], bounds=[0, len(self.graph_array)])
+            self.GraphWidget.addItem(self.region)
+
+        # Update region position
+        if self.region:
+            self.region.setRegion([0, ms_of_graph * self.ms_to_array_factor])
+
+
+class _FadeTrack(QThread):
+    finished = pyqtSignal()
+
+    def __init__(self, player: vlc.MediaPlayer, fade_seconds: int) -> None:
+        super().__init__()
+        self.player = player
+        self.fade_seconds = fade_seconds
+
+    def run(self) -> None:
+        """
+        Implementation of fading the player
+        """
+
+        if not self.player:
+            return
+
+        # Reduce volume logarithmically
+        total_steps = self.fade_seconds * Config.FADEOUT_STEPS_PER_SECOND
+        if total_steps > 0:
+            db_reduction_per_step = Config.FADEOUT_DB / total_steps
+            reduction_factor_per_step = pow(10, (db_reduction_per_step / 20))
+
+            volume = self.player.audio_get_volume()
+
+            for i in range(1, total_steps + 1):
+                self.player.audio_set_volume(
+                    int(volume * pow(reduction_factor_per_step, i))
+                )
+                sleep(1 / Config.FADEOUT_STEPS_PER_SECOND)
+
+        self.finished.emit()
+
+
+# TODO can we move this into the _Music class?
+vlc_instance = VLCManager().vlc_instance
+
+
+class _Music:
+    """
+    Manage the playing of music tracks
+    """
+
+    def __init__(self, name: str) -> None:
+        vlc_instance.set_user_agent(name, name)
+        self.player: Optional[vlc.MediaPlayer] = None
+        self.name = name
+        self.max_volume: int = Config.VLC_VOLUME_DEFAULT
+        self.start_dt: Optional[dt.datetime] = None
+
+        # Set up logging
+        # self._set_vlc_log()
+
+    # VLC logging very noisy so comment out unless needed
+    # @VLC_LOG_CB
+    # def log_callback(data, level, ctx, fmt, args):
+    #     try:
+    #         # Create a ctypes string buffer to hold the formatted message
+    #         buf = ctypes.create_string_buffer(1024)
+
+    #         # Use vsnprintf to format the string with the va_list
+    #         libc.vsnprintf(buf, len(buf), fmt, args)
+
+    #         # Decode the formatted message
+    #         message = buf.value.decode("utf-8", errors="replace")
+    #         log.debug("VLC: " + message)
+    #     except Exception as e:
+    #         log.error(f"Error in VLC log callback: {e}")
+
+    # def _set_vlc_log(self):
+    #     try:
+    #         vlc.libvlc_log_set(vlc_instance, self.log_callback, None)
+    #         log.debug("VLC logging set up successfully")
+    #     except Exception as e:
+    #         log.error(f"Failed to set up VLC logging: {e}")
+
+    def adjust_by_ms(self, ms: int) -> None:
+        """Move player position by ms milliseconds"""
+
+        if not self.player:
+            return
+
+        elapsed_ms = self.get_playtime()
+        position = self.get_position()
+        if not position:
+            position = 0.0
+        new_position = max(0.0, position + ((position * ms) / elapsed_ms))
+        self.set_position(new_position)
+        # Adjus start time so elapsed time calculations are correct
+        if new_position == 0:
+            self.start_dt = dt.datetime.now()
+        else:
+            if self.start_dt:
+                self.start_dt -= dt.timedelta(milliseconds=ms)
+            else:
+                self.start_dt = dt.datetime.now() - dt.timedelta(milliseconds=ms)
+
+    def fade(self, fade_seconds: int) -> None:
+        """
+        Fade the currently playing track.
+
+        The actual management of fading runs in its own thread so as not
+        to hold up the UI during the fade.
+        """
+
+        if not self.player:
+            return
+
+        if not self.player.get_position() > 0 and self.player.is_playing():
+            return
+
+        self.fader_worker = _FadeTrack(self.player, fade_seconds=fade_seconds)
+        self.fader_worker.finished.connect(self.player.release)
+        self.fader_worker.start()
+        self.start_dt = None
+
+    def get_playtime(self) -> int:
+        """
+        Return number of milliseconds current track has been playing or
+        zero if not playing. The vlc function get_time() only updates 3-4
+        times a second; this function has much better resolution.
+        """
+
+        if self.start_dt is None:
+            return 0
+
+        now = dt.datetime.now()
+        elapsed_seconds = (now - self.start_dt).total_seconds()
+        return int(elapsed_seconds * 1000)
+
+    def get_position(self) -> Optional[float]:
+        """Return current position"""
+
+        if not self.player:
+            return None
+        return self.player.get_position()
+
+    def is_playing(self) -> bool:
+        """
+        Return True if we're playing
+        """
+
+        if not self.player:
+            return False
+
+        # There is a discrete time between starting playing a track and
+        # player.is_playing() returning True, so assume playing if less
+        # than Config.PLAY_SETTLE microseconds have passed since
+        # starting play.
+        return self.start_dt is not None and (
+            self.player.is_playing()
+            or (dt.datetime.now() - self.start_dt)
+            < dt.timedelta(microseconds=Config.PLAY_SETTLE)
+        )
+
+    def play(
+        self,
+        path: str,
+        start_time: dt.datetime,
+        position: Optional[float] = None,
+    ) -> None:
+        """
+        Start playing the track at path.
+
+        Log and return if path not found.
+
+        start_time ensures our version and our caller's version of
+        the start time is the same
+        """
+
+        log.debug(f"Music[{self.name}].play({path=}, {position=}")
+
+        if helpers.file_is_unreadable(path):
+            log.error(f"play({path}): path not readable")
+            return None
+
+        self.player = vlc.MediaPlayer(vlc_instance, path)
+        if self.player is None:
+            log.error(f"_Music:play: failed to create MediaPlayer ({path=})")
+            helpers.show_warning(
+                None, "Error creating MediaPlayer", f"Cannot play file ({path})"
+            )
+            return
+
+        _ = self.player.play()
+        self.set_volume(self.max_volume)
+
+        if position:
+            self.player.set_position(position)
+        self.start_dt = start_time
+
+    def set_position(self, position: float) -> None:
+        """
+        Set player position
+        """
+
+        if self.player:
+            self.player.set_position(position)
+
+    def set_volume(
+        self, volume: Optional[int] = None, set_default: bool = True
+    ) -> None:
+        """Set maximum volume used for player"""
+
+        if not self.player:
+            return
+
+        if set_default and volume:
+            self.max_volume = volume
+
+        if volume is None:
+            volume = Config.VLC_VOLUME_DEFAULT
+
+        self.player.audio_set_volume(volume)
+
+    def stop(self) -> None:
+        """Immediately stop playing"""
+
+        log.debug(f"Music[{self.name}].stop()")
+
+        self.start_dt = None
+
+        if not self.player:
+            return
+
+        if self.player.is_playing():
+            self.player.stop()
+        self.player.release()
+        self.player = None
+
+
+class RowAndTrack:
+    """
+    Object to manage playlist rows and tracks.
+    """
+
+    def __init__(self, playlist_row: PlaylistRows) -> None:
+        """
+        Initialises data structure.
+
+        The passed PlaylistRows object will include a Tracks object if this
+        row has a track.
+        """
+
+        # Collect playlistrow data
+        self.note = playlist_row.note
+        self.played = playlist_row.played
+        self.playlist_id = playlist_row.playlist_id
+        self.playlistrow_id = playlist_row.id
+        self.row_number = playlist_row.row_number
+        self.track_id = playlist_row.track_id
+
+        # Playlist display data
+        self.row_fg: Optional[str] = None
+        self.row_bg: Optional[str] = None
+        self.note_fg: Optional[str] = None
+        self.note_bg: Optional[str] = None
+
+        # Collect track data if there's a track
+        if playlist_row.track_id:
+            self.artist = playlist_row.track.artist
+            self.bitrate = playlist_row.track.bitrate
+            self.duration = playlist_row.track.duration
+            self.fade_at = playlist_row.track.fade_at
+            self.intro = playlist_row.track.intro
+            if playlist_row.track.playdates:
+                self.lastplayed = max(
+                    [a.lastplayed for a in playlist_row.track.playdates]
+                )
+            else:
+                self.lastplayed = Config.EPOCH
+            self.path = playlist_row.track.path
+            self.silence_at = playlist_row.track.silence_at
+            self.start_gap = playlist_row.track.start_gap
+            self.title = playlist_row.track.title
+        else:
+            self.artist = ""
+            self.bitrate = 0
+            self.duration = 0
+            self.fade_at = 0
+            self.intro = None
+            self.lastplayed = Config.EPOCH
+            self.path = ""
+            self.silence_at = 0
+            self.start_gap = 0
+            self.title = ""
+
+        # Track playing data
+        self.end_of_track_signalled: bool = False
+        self.end_time: Optional[dt.datetime] = None
+        self.fade_graph: Optional[_FadeCurve] = None
+        self.fade_graph_start_updates: Optional[dt.datetime] = None
+        self.resume_marker: Optional[float] = 0.0
+        self.forecast_end_time: Optional[dt.datetime] = None
+        self.forecast_start_time: Optional[dt.datetime] = None
+        self.start_time: Optional[dt.datetime] = None
+
+        # Other object initialisation
+        self.music = _Music(name=Config.VLC_MAIN_PLAYER_NAME)
+        self.signals = MusicMusterSignals()
+
+    def __repr__(self) -> str:
+        return (
+            f"<RowAndTrack(playlist_id={self.playlist_id}, "
+            f"row_number={self.row_number}, "
+            f"playlistrow_id={self.playlistrow_id}, "
+            f"note={self.note}, track_id={self.track_id}>"
+        )
+
+    def check_for_end_of_track(self) -> None:
+        """
+        Check whether track has ended. If so, emit track_ended_signal
+        """
+
+        if self.start_time is None:
+            return
+
+        if self.end_of_track_signalled:
+            return
+
+        if self.music.is_playing():
+            return
+
+        self.start_time = None
+        if self.fade_graph:
+            self.fade_graph.clear()
+        # Ensure that player is released
+        self.music.fade(0)
+        self.signals.track_ended_signal.emit()
+        self.end_of_track_signalled = True
+
+    def create_fade_graph(self) -> None:
+        """
+        Initialise and add FadeCurve in a thread as it's slow
+        """
+
+        self.fadecurve_thread = QThread()
+        self.worker = _AddFadeCurve(
+            self,
+            track_path=self.path,
+            track_fade_at=self.fade_at,
+            track_silence_at=self.silence_at,
+        )
+        self.worker.moveToThread(self.fadecurve_thread)
+        self.fadecurve_thread.started.connect(self.worker.run)
+        self.worker.finished.connect(self.fadecurve_thread.quit)
+        self.worker.finished.connect(self.worker.deleteLater)
+        self.fadecurve_thread.finished.connect(self.fadecurve_thread.deleteLater)
+        self.fadecurve_thread.start()
+
+    def drop3db(self, enable: bool) -> None:
+        """
+        If enable is true, drop output by 3db else restore to full volume
+        """
+
+        if enable:
+            self.music.set_volume(volume=Config.VLC_VOLUME_DROP3db, set_default=False)
+        else:
+            self.music.set_volume(volume=Config.VLC_VOLUME_DEFAULT, set_default=False)
+
+    def fade(self, fade_seconds: int = Config.FADEOUT_SECONDS) -> None:
+        """Fade music"""
+
+        self.resume_marker = self.music.get_position()
+        self.music.fade(fade_seconds)
+        self.signals.track_ended_signal.emit()
+
+    def is_playing(self) -> bool:
+        """
+        Return True if we're currently playing else False
+        """
+
+        if self.start_time is None:
+            return False
+
+        return self.music.is_playing()
+
+    def move_back(self, ms: int = Config.PREVIEW_BACK_MS) -> None:
+        """
+        Rewind player by ms milliseconds
+        """
+
+        self.music.adjust_by_ms(ms * -1)
+
+    def move_forward(self, ms: int = Config.PREVIEW_ADVANCE_MS) -> None:
+        """
+        Rewind player by ms milliseconds
+        """
+
+        self.music.adjust_by_ms(ms)
+
+    def play(self, position: Optional[float] = None) -> None:
+        """Play track"""
+
+        now = dt.datetime.now()
+        self.start_time = now
+
+        # Initialise player
+        self.music.play(self.path, start_time=now, position=position)
+
+        self.end_time = now + dt.timedelta(milliseconds=self.duration)
+
+        # Calculate time fade_graph should start updating
+        if self.fade_at:
+            update_graph_at_ms = max(
+                0, self.fade_at - Config.FADE_CURVE_MS_BEFORE_FADE - 1
+            )
+            self.fade_graph_start_updates = now + dt.timedelta(
+                milliseconds=update_graph_at_ms
+            )
+
+    def restart(self) -> None:
+        """
+        Restart player
+        """
+
+        self.music.adjust_by_ms(self.time_playing() * -1)
+
+    def set_forecast_start_time(
+        self, modified_rows: list[int], start: Optional[dt.datetime]
+    ) -> Optional[dt.datetime]:
+        """
+        Set forecast start time for this row
+
+        Update passed modified rows list if we changed the row.
+
+        Return new start time
+        """
+
+        changed = False
+
+        if self.forecast_start_time != start:
+            self.forecast_start_time = start
+            changed = True
+        if start is None:
+            if self.forecast_end_time is not None:
+                self.forecast_end_time = None
+                changed = True
+            new_start_time = None
+        else:
+            end_time = start + dt.timedelta(milliseconds=self.duration)
+            new_start_time = end_time
+            if self.forecast_end_time != end_time:
+                self.forecast_end_time = end_time
+                changed = True
+
+        if changed and self.row_number not in modified_rows:
+            modified_rows.append(self.row_number)
+
+        return new_start_time
+
+    def stop(self, fade_seconds: int = 0) -> None:
+        """
+        Stop this track playing
+        """
+
+        self.resume_marker = self.music.get_position()
+        self.fade(fade_seconds)
+
+        # Reset fade graph
+        if self.fade_graph:
+            self.fade_graph.clear()
+
+    def time_playing(self) -> int:
+        """
+        Return time track has been playing in milliseconds, zero if not playing
+        """
+
+        if self.start_time is None:
+            return 0
+
+        return self.music.get_playtime()
+
+    def time_remaining_intro(self) -> int:
+        """
+        Return milliseconds of intro remaining. Return 0 if no intro time in track
+        record or if intro has finished.
+        """
+
+        if not self.intro:
+            return 0
+
+        return max(0, self.intro - self.time_playing())
+
+    def time_to_fade(self) -> int:
+        """
+        Return milliseconds until fade time. Return zero if we're not playing.
+        """
+
+        if self.start_time is None:
+            return 0
+
+        return self.fade_at - self.time_playing()
+
+    def time_to_silence(self) -> int:
+        """
+        Return milliseconds until silent. Return zero if we're not playing.
+        """
+
+        if self.start_time is None:
+            return 0
+
+        return self.silence_at - self.time_playing()
+
+    def update_fade_graph(self) -> None:
+        """
+        Update fade graph
+        """
+
+        if (
+            not self.is_playing()
+            or not self.fade_graph_start_updates
+            or not self.fade_graph
+        ):
+            return
+
+        now = dt.datetime.now()
+
+        if self.fade_graph_start_updates > now:
+            return
+
+        self.fade_graph.tick(self.time_playing())
+
+    def update_playlist_and_row(self, session: Session) -> None:
+        """
+        Update local playlist_id and row_number from playlistrow_id
+        """
+
+        plr = session.get(PlaylistRows, self.playlistrow_id)
+        if not plr:
+            raise ApplicationError(f"(Can't retrieve PlaylistRows entry, {self=}")
+        self.playlist_id = plr.playlist_id
+        self.row_number = plr.row_number
+
+
+class TrackSequence:
+    next: Optional[RowAndTrack] = None
+    current: Optional[RowAndTrack] = None
+    previous: Optional[RowAndTrack] = None
+
+    def set_next(self, rat: Optional[RowAndTrack]) -> None:
+        """
+        Set the 'next' track to be passed rat. Clear
+        any previous next track. If passed rat is None
+        just clear existing next track.
+        """
+
+        # Clear any existing fade graph
+        if self.next and self.next.fade_graph:
+            self.next.fade_graph.clear()
+
+        if rat is None:
+            self.next = None
+        else:
+            self.next = rat
+            self.next.create_fade_graph()
+
+
+track_sequence = TrackSequence()

app/querylistmodel.py

@@ -0,0 +1,290 @@
+# Standard library imports
+# Allow forward reference to PlaylistModel
+from __future__ import annotations
+
+from collections.abc import Callable
+from dataclasses import dataclass
+from typing import Optional
+import datetime as dt
+
+# PyQt imports
+from PyQt6.QtCore import (
+    QAbstractTableModel,
+    QModelIndex,
+    Qt,
+    QVariant,
+)
+from PyQt6.QtGui import (
+    QBrush,
+    QColor,
+    QFont,
+)
+
+# Third party imports
+from sqlalchemy.orm.session import Session
+
+# import snoop  # type: ignore
+
+# App imports
+from classes import (
+    ApplicationError,
+    Filter,
+    QueryCol,
+)
+from config import Config
+from helpers import (
+    file_is_unreadable,
+    get_relative_date,
+    ms_to_mmss,
+    show_warning,
+)
+from log import log
+from models import db, Playdates, Tracks
+from music_manager import RowAndTrack
+
+
+@dataclass
+class QueryRow:
+    artist: str
+    bitrate: int
+    duration: int
+    lastplayed: Optional[dt.datetime]
+    path: str
+    title: str
+    track_id: int
+
+
+class QuerylistModel(QAbstractTableModel):
+    """
+    The Querylist Model
+
+    Used to support query lists. The underlying database is never
+    updated. We just present tracks that match a query and allow the user
+    to copy those to a playlist.
+
+    """
+
+    def __init__(self, session: Session, filter: Filter) -> None:
+        """
+        Load query
+        """
+
+        log.debug(f"QuerylistModel.__init__({filter=})")
+
+        super().__init__()
+        self.session = session
+        self.filter = filter
+
+        self.querylist_rows: dict[int, QueryRow] = {}
+        self._selected_rows: set[int] = set()
+
+        self.load_data()
+
+    def __repr__(self) -> str:
+        return f"<QuerylistModel: filter={self.filter}, {self.rowCount()} rows>"
+
+    def _background_role(self, row: int, column: int, qrow: QueryRow) -> QBrush:
+        """Return background setting"""
+
+        # Unreadable track file
+        if file_is_unreadable(qrow.path):
+            return QBrush(QColor(Config.COLOUR_UNREADABLE))
+
+        # Selected row
+        if row in self._selected_rows:
+            return QBrush(QColor(Config.COLOUR_QUERYLIST_SELECTED))
+
+        # Individual cell colouring
+        if column == QueryCol.BITRATE.value:
+            if not qrow.bitrate or qrow.bitrate < Config.BITRATE_LOW_THRESHOLD:
+                return QBrush(QColor(Config.COLOUR_BITRATE_LOW))
+            elif qrow.bitrate < Config.BITRATE_OK_THRESHOLD:
+                return QBrush(QColor(Config.COLOUR_BITRATE_MEDIUM))
+            else:
+                return QBrush(QColor(Config.COLOUR_BITRATE_OK))
+
+        return QBrush()
+
+    def columnCount(self, parent: QModelIndex = QModelIndex()) -> int:
+        """Standard function for view"""
+
+        return len(QueryCol)
+
+    def data(
+        self, index: QModelIndex, role: int = Qt.ItemDataRole.DisplayRole
+    ) -> QVariant:
+        """Return data to view"""
+
+        if (
+            not index.isValid()
+            or not (0 <= index.row() < len(self.querylist_rows))
+            or role
+            in [
+                Qt.ItemDataRole.CheckStateRole,
+                Qt.ItemDataRole.DecorationRole,
+                Qt.ItemDataRole.EditRole,
+                Qt.ItemDataRole.FontRole,
+                Qt.ItemDataRole.ForegroundRole,
+                Qt.ItemDataRole.InitialSortOrderRole,
+                Qt.ItemDataRole.SizeHintRole,
+                Qt.ItemDataRole.StatusTipRole,
+                Qt.ItemDataRole.TextAlignmentRole,
+                Qt.ItemDataRole.WhatsThisRole,
+            ]
+        ):
+            return QVariant()
+
+        row = index.row()
+        column = index.column()
+        # rat for playlist row data as it's used a lot
+        qrow = self.querylist_rows[row]
+
+        # Dispatch to role-specific functions
+        dispatch_table: dict[int, Callable] = {
+            int(Qt.ItemDataRole.BackgroundRole): self._background_role,
+            int(Qt.ItemDataRole.DisplayRole): self._display_role,
+            int(Qt.ItemDataRole.ToolTipRole): self._tooltip_role,
+        }
+
+        if role in dispatch_table:
+            return QVariant(dispatch_table[role](row, column, qrow))
+
+        # Fall through to no-op
+        return QVariant()
+
+    def _display_role(self, row: int, column: int, qrow: QueryRow) -> str:
+        """
+        Return text for display
+        """
+
+        dispatch_table = {
+            QueryCol.ARTIST.value: qrow.artist,
+            QueryCol.BITRATE.value: str(qrow.bitrate),
+            QueryCol.DURATION.value: ms_to_mmss(qrow.duration),
+            QueryCol.LAST_PLAYED.value: get_relative_date(qrow.lastplayed),
+            QueryCol.TITLE.value: qrow.title,
+        }
+        if column in dispatch_table:
+            return dispatch_table[column]
+
+        return ""
+
+    def flags(self, index: QModelIndex) -> Qt.ItemFlag:
+        """
+        Standard model flags
+        """
+
+        if not index.isValid():
+            return Qt.ItemFlag.NoItemFlags
+
+        return Qt.ItemFlag.ItemIsEnabled | Qt.ItemFlag.ItemIsSelectable
+
+    def get_selected_track_ids(self) -> list[int]:
+        """
+        Return a list of track_ids from selected tracks
+        """
+
+        return [self.querylist_rows[row].track_id for row in self._selected_rows]
+
+    def headerData(
+        self,
+        section: int,
+        orientation: Qt.Orientation,
+        role: int = Qt.ItemDataRole.DisplayRole,
+    ) -> QVariant:
+        """
+        Return text for headers
+        """
+
+        display_dispatch_table = {
+            QueryCol.TITLE.value: QVariant(Config.HEADER_TITLE),
+            QueryCol.ARTIST.value: QVariant(Config.HEADER_ARTIST),
+            QueryCol.DURATION.value: QVariant(Config.HEADER_DURATION),
+            QueryCol.LAST_PLAYED.value: QVariant(Config.HEADER_LAST_PLAYED),
+            QueryCol.BITRATE.value: QVariant(Config.HEADER_BITRATE),
+        }
+
+        if role == Qt.ItemDataRole.DisplayRole:
+            if orientation == Qt.Orientation.Horizontal:
+                return display_dispatch_table[section]
+            else:
+                if Config.ROWS_FROM_ZERO:
+                    return QVariant(str(section))
+                else:
+                    return QVariant(str(section + 1))
+
+        elif role == Qt.ItemDataRole.FontRole:
+            boldfont = QFont()
+            boldfont.setBold(True)
+            return QVariant(boldfont)
+
+        return QVariant()
+
+    def load_data(self) -> None:
+        """
+        Populate self.querylist_rows
+        """
+
+        # Clear any exsiting rows
+        self.querylist_rows = {}
+        row = 0
+
+        try:
+            results = Tracks.get_filtered_tracks(self.session, self.filter)
+            for result in results:
+                lastplayed = None
+                if hasattr(result, "playdates"):
+                    pds = result.playdates
+                    if pds:
+                        lastplayed = max([a.lastplayed for a in pds])
+                queryrow = QueryRow(
+                    artist=result.artist,
+                    bitrate=result.bitrate or 0,
+                    duration=result.duration,
+                    lastplayed=lastplayed,
+                    path=result.path,
+                    title=result.title,
+                    track_id=result.id,
+                )
+
+                self.querylist_rows[row] = queryrow
+                row += 1
+        except ApplicationError as e:
+            show_warning(None, "Query error", f"Error loading query data ({e})")
+
+    def rowCount(self, index: QModelIndex = QModelIndex()) -> int:
+        """Standard function for view"""
+
+        return len(self.querylist_rows)
+
+    def toggle_row_selection(self, row: int) -> None:
+        if row in self._selected_rows:
+            self._selected_rows.discard(row)
+        else:
+            self._selected_rows.add(row)
+
+        # Emit dataChanged for the entire row
+        top_left = self.index(row, 0)
+        bottom_right = self.index(row, self.columnCount() - 1)
+        self.dataChanged.emit(top_left, bottom_right, [Qt.ItemDataRole.BackgroundRole])
+
+    def _tooltip_role(self, row: int, column: int, rat: RowAndTrack) -> str | QVariant:
+        """
+        Return tooltip. Currently only used for last_played column.
+        """
+
+        if column != QueryCol.LAST_PLAYED.value:
+            return QVariant()
+        with db.Session() as session:
+            track_id = self.querylist_rows[row].track_id
+            if not track_id:
+                return QVariant()
+            playdates = Playdates.last_playdates(session, track_id)
+            return (
+                "<br>".join(
+                    [
+                        a.lastplayed.strftime(Config.LAST_PLAYED_TOOLTIP_DATE_FORMAT)
+                        for a in reversed(playdates)
+                    ]
+                )
+            )

app/songdb.py

@@ -1,197 +0,0 @@
-#!/usr/bin/env python
-
-import argparse
-import os
-import shutil
-import tempfile
-
-from config import Config
-from log import DEBUG, INFO
-from model import Tracks, Session
-from mutagen.flac import FLAC
-from pydub import AudioSegment, effects
-from tinytag import TinyTag
-
-
-def main():
-    "Main loop"
-
-    INFO("Starting")
-
-    # Parse command line
-    p = argparse.ArgumentParser()
-    p.add_argument('-u', '--update',
-                   action="store_true", dest="update",
-                   default=True, help="Update database")
-    args = p.parse_args()
-
-    # Run as required
-    if args.update:
-        INFO("Updating database")
-        with Session() as session:
-            update_db(session)
-
-    INFO("Finished")
-
-
-def add_path_to_db(session, path):
-    "Add passed path to database along with metadata"
-
-    track = Tracks.get_or_create(session, path)
-    tag = TinyTag.get(path)
-    audio = get_audio_segment(path)
-
-    track.title = tag.title
-    track.artist = tag.artist
-    track.duration = int(round(tag.duration,
-                               Config.MILLISECOND_SIGFIGS) * 1000)
-    track.start_gap = leading_silence(audio)
-    track.fade_at = round(fade_point(audio) / 1000,
-                          Config.MILLISECOND_SIGFIGS) * 1000
-    track.silence_at = round(trailing_silence(audio) / 1000,
-                             Config.MILLISECOND_SIGFIGS) * 1000
-    track.mtime = os.path.getmtime(path)
-    session.commit()
-
-    if Config.NORMALISE_ON_IMPORT:
-        # Get current file gid, uid and permissions
-        stats = os.stat(path)
-        try:
-            # Copy original file
-            fd, temp_path = tempfile.mkstemp()
-            shutil.copyfile(path, temp_path)
-        except Exception as err:
-            DEBUG(f"songdb.add_path_to_db({path}): err1: {str(err)}")
-            return
-
-    # Overwrite original file with normalised output
-    normalised = effects.normalize(audio)
-    try:
-        normalised.export(path, format=os.path.splitext(path)[1][1:])
-        # Fix up permssions and ownership
-        os.chown(path, stats.st_uid, stats.st_gid)
-        os.chmod(path, stats.st_mode)
-        # Copy tags
-        src = FLAC(temp_path)
-        dst = FLAC(path)
-        for tag in src:
-            dst[tag] = src[tag]
-        dst.save()
-    except Exception as err:
-        DEBUG(f"songdb.add_path_to_db({path}): err2: {str(err)}")
-        # Restore original file
-        shutil.copyfile(path, temp_path)
-    finally:
-        if os.path.exists(temp_path):
-            os.remove(temp_path)
-
-    return track
-
-
-def get_audio_segment(path):
-    try:
-        if path.endswith('.mp3'):
-            return AudioSegment.from_mp3(path)
-        elif path.endswith('.flac'):
-            return AudioSegment.from_file(path, "flac")
-    except AttributeError:
-        return None
-
-
-def leading_silence(audio_segment, silence_threshold=Config.DBFS_SILENCE,
-                    chunk_size=Config.AUDIO_SEGMENT_CHUNK_SIZE):
-    """
-    Returns the millisecond/index that the leading silence ends.
-    audio_segment - the segment to find silence in
-    silence_threshold - the upper bound for how quiet is silent in dFBS
-    chunk_size - chunk size for interating over the segment in ms
-
-    https://github.com/jiaaro/pydub/blob/master/pydub/silence.py
-    """
-
-    trim_ms = 0  # ms
-    assert chunk_size > 0  # to avoid infinite loop
-    while (
-        audio_segment[trim_ms:trim_ms + chunk_size].dBFS <      # noqa W504
-            silence_threshold and trim_ms < len(audio_segment)):
-        trim_ms += chunk_size
-
-    # if there is no end it should return the length of the segment
-    return min(trim_ms, len(audio_segment))
-
-
-def fade_point(audio_segment, fade_threshold=Config.DBFS_FADE,
-               chunk_size=Config.AUDIO_SEGMENT_CHUNK_SIZE):
-    """
-    Returns the millisecond/index of the point where the fade is down to
-    fade_threshold and doesn't get louder again.
-    audio_segment - the sdlg_search_database_uiegment to find silence in
-    fade_threshold - the upper bound for how quiet is silent in dFBS
-    chunk_size - chunk size for interating over the segment in ms
-    """
-
-    assert chunk_size > 0  # to avoid infinite loop
-
-    segment_length = audio_segment.duration_seconds * 1000  # ms
-    trim_ms = segment_length - chunk_size
-    while (
-        audio_segment[trim_ms:trim_ms + chunk_size].dBFS < fade_threshold
-            and trim_ms > 0):       # noqa W503
-        trim_ms -= chunk_size
-
-    # if there is no trailing silence, return lenght of track (it's less
-    # the chunk_size, but for chunk_size = 10ms, this may be ignored)
-    return int(trim_ms)
-
-
-# Current unused (1 June 2021)
-# def rescan_database(session):
-#
-#     tracks = Tracks.get_all_tracks(session)
-#     total_tracks = len(tracks)
-#     track_count = 0
-#     for track in tracks:
-#         track_count += 1
-#         print(f"Track {track_count} of {total_tracks}")
-#         audio = get_audio_segment(track.path)
-#         track.start_gap = leading_silence(audio)
-#         track.fade_at = fade_point(audio)
-#         track.silence_at = trailing_silence(audio)
-#         session.commit()
-
-
-def trailing_silence(audio_segment, silence_threshold=-50.0,
-                     chunk_size=Config.AUDIO_SEGMENT_CHUNK_SIZE):
-    return fade_point(audio_segment, silence_threshold, chunk_size)
-
-
-def update_db(session):
-    """
-    Repopulate database
-    """
-
-    # Search for tracks in only one of directory and database
-
-    db_paths = set(Tracks.get_all_paths(session))
-
-    os_paths_list = []
-    for root, dirs, files in os.walk(Config.ROOT):
-        for f in files:
-            path = os.path.join(root, f)
-            ext = os.path.splitext(f)[1]
-            if ext in [".flac", ".mp3"]:
-                os_paths_list.append(path)
-    os_paths = set(os_paths_list)
-
-    for path in list(db_paths - os_paths):
-        # TODO
-        INFO(f"To remove from database: {path}")
-
-    for path in list(os_paths - db_paths):
-        # TODO
-        INFO(f"Adding to dataabase: {path}")
-        add_path_to_db(session, path)
-
-
-if __name__ == '__main__' and '__file__' in globals():
-    main()

app/ui/dlgQuery.ui

@@ -0,0 +1,94 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>queryDialog</class>
+ <widget class="QDialog" name="queryDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>762</width>
+    <height>686</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Query</string>
+  </property>
+  <widget class="QTableView" name="tableView">
+   <property name="geometry">
+    <rect>
+     <x>10</x>
+     <y>65</y>
+     <width>741</width>
+     <height>561</height>
+    </rect>
+   </property>
+  </widget>
+  <widget class="QLabel" name="label">
+   <property name="geometry">
+    <rect>
+     <x>20</x>
+     <y>10</y>
+     <width>61</width>
+     <height>24</height>
+    </rect>
+   </property>
+   <property name="text">
+    <string>Query:</string>
+   </property>
+  </widget>
+  <widget class="QComboBox" name="cboQuery">
+   <property name="geometry">
+    <rect>
+     <x>80</x>
+     <y>10</y>
+     <width>221</width>
+     <height>32</height>
+    </rect>
+   </property>
+  </widget>
+  <widget class="QPushButton" name="btnAddTracks">
+   <property name="geometry">
+    <rect>
+     <x>530</x>
+     <y>640</y>
+     <width>102</width>
+     <height>36</height>
+    </rect>
+   </property>
+   <property name="text">
+    <string>Add &amp;tracks</string>
+   </property>
+  </widget>
+  <widget class="QLabel" name="lblDescription">
+   <property name="geometry">
+    <rect>
+     <x>330</x>
+     <y>10</y>
+     <width>401</width>
+     <height>46</height>
+    </rect>
+   </property>
+   <property name="text">
+    <string>TextLabel</string>
+   </property>
+   <property name="alignment">
+    <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignTop</set>
+   </property>
+  </widget>
+  <widget class="QPushButton" name="pushButton">
+   <property name="geometry">
+    <rect>
+     <x>650</x>
+     <y>640</y>
+     <width>102</width>
+     <height>36</height>
+    </rect>
+   </property>
+   <property name="text">
+    <string>Close</string>
+   </property>
+  </widget>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

app/ui/dlgQuery_ui.py

@@ -0,0 +1,45 @@
+# Form implementation generated from reading ui file 'app/ui/dlgQuery.ui'
+#
+# Created by: PyQt6 UI code generator 6.8.1
+#
+# WARNING: Any manual changes made to this file will be lost when pyuic6 is
+# run again.  Do not edit this file unless you know what you are doing.
+
+
+from PyQt6 import QtCore, QtGui, QtWidgets
+
+
+class Ui_queryDialog(object):
+    def setupUi(self, queryDialog):
+        queryDialog.setObjectName("queryDialog")
+        queryDialog.resize(762, 686)
+        self.tableView = QtWidgets.QTableView(parent=queryDialog)
+        self.tableView.setGeometry(QtCore.QRect(10, 65, 741, 561))
+        self.tableView.setObjectName("tableView")
+        self.label = QtWidgets.QLabel(parent=queryDialog)
+        self.label.setGeometry(QtCore.QRect(20, 10, 61, 24))
+        self.label.setObjectName("label")
+        self.cboQuery = QtWidgets.QComboBox(parent=queryDialog)
+        self.cboQuery.setGeometry(QtCore.QRect(80, 10, 221, 32))
+        self.cboQuery.setObjectName("cboQuery")
+        self.btnAddTracks = QtWidgets.QPushButton(parent=queryDialog)
+        self.btnAddTracks.setGeometry(QtCore.QRect(530, 640, 102, 36))
+        self.btnAddTracks.setObjectName("btnAddTracks")
+        self.lblDescription = QtWidgets.QLabel(parent=queryDialog)
+        self.lblDescription.setGeometry(QtCore.QRect(330, 10, 401, 46))
+        self.lblDescription.setAlignment(QtCore.Qt.AlignmentFlag.AlignLeading|QtCore.Qt.AlignmentFlag.AlignLeft|QtCore.Qt.AlignmentFlag.AlignTop)
+        self.lblDescription.setObjectName("lblDescription")
+        self.pushButton = QtWidgets.QPushButton(parent=queryDialog)
+        self.pushButton.setGeometry(QtCore.QRect(650, 640, 102, 36))
+        self.pushButton.setObjectName("pushButton")
+
+        self.retranslateUi(queryDialog)
+        QtCore.QMetaObject.connectSlotsByName(queryDialog)
+
+    def retranslateUi(self, queryDialog):
+        _translate = QtCore.QCoreApplication.translate
+        queryDialog.setWindowTitle(_translate("queryDialog", "Query"))
+        self.label.setText(_translate("queryDialog", "Query:"))
+        self.btnAddTracks.setText(_translate("queryDialog", "Add &tracks"))
+        self.lblDescription.setText(_translate("queryDialog", "TextLabel"))
+        self.pushButton.setText(_translate("queryDialog", "Close"))

app/ui/dlgReplaceFiles.ui

@@ -0,0 +1,145 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>Dialog</class>
+ <widget class="QDialog" name="Dialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>1038</width>
+    <height>774</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Dialog</string>
+  </property>
+  <widget class="QDialogButtonBox" name="buttonBox">
+   <property name="geometry">
+    <rect>
+     <x>680</x>
+     <y>730</y>
+     <width>341</width>
+     <height>32</height>
+    </rect>
+   </property>
+   <property name="orientation">
+    <enum>Qt::Horizontal</enum>
+   </property>
+   <property name="standardButtons">
+    <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+   </property>
+  </widget>
+  <widget class="QLabel" name="label">
+   <property name="geometry">
+    <rect>
+     <x>10</x>
+     <y>15</y>
+     <width>181</width>
+     <height>24</height>
+    </rect>
+   </property>
+   <property name="text">
+    <string>Source directory:</string>
+   </property>
+   <property name="alignment">
+    <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+   </property>
+  </widget>
+  <widget class="QLabel" name="label_2">
+   <property name="geometry">
+    <rect>
+     <x>10</x>
+     <y>50</y>
+     <width>181</width>
+     <height>24</height>
+    </rect>
+   </property>
+   <property name="text">
+    <string>Destination directory:</string>
+   </property>
+   <property name="alignment">
+    <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+   </property>
+  </widget>
+  <widget class="QLabel" name="lblSourceDirectory">
+   <property name="geometry">
+    <rect>
+     <x>200</x>
+     <y>15</y>
+     <width>811</width>
+     <height>24</height>
+    </rect>
+   </property>
+   <property name="text">
+    <string>lblSourceDirectory</string>
+   </property>
+  </widget>
+  <widget class="QLabel" name="lblDestinationDirectory">
+   <property name="geometry">
+    <rect>
+     <x>200</x>
+     <y>50</y>
+     <width>811</width>
+     <height>24</height>
+    </rect>
+   </property>
+   <property name="text">
+    <string>lblDestinationDirectory</string>
+   </property>
+  </widget>
+  <widget class="QTableWidget" name="tableWidget">
+   <property name="geometry">
+    <rect>
+     <x>20</x>
+     <y>90</y>
+     <width>1001</width>
+     <height>621</height>
+    </rect>
+   </property>
+   <property name="alternatingRowColors">
+    <bool>true</bool>
+   </property>
+   <property name="columnCount">
+    <number>3</number>
+   </property>
+   <column/>
+   <column/>
+   <column/>
+  </widget>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>Dialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>Dialog</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

app/ui/dlg_Cart.ui

@@ -0,0 +1,164 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>DialogCartEdit</class>
+ <widget class="QDialog" name="DialogCartEdit">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>564</width>
+    <height>148</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Carts</string>
+  </property>
+  <layout class="QGridLayout" name="gridLayout">
+   <item row="0" column="0">
+    <widget class="QLabel" name="label">
+     <property name="maximumSize">
+      <size>
+       <width>56</width>
+       <height>16777215</height>
+      </size>
+     </property>
+     <property name="text">
+      <string>&amp;Name:</string>
+     </property>
+     <property name="buddy">
+      <cstring>lineEditName</cstring>
+     </property>
+    </widget>
+   </item>
+   <item row="0" column="1" colspan="2">
+    <widget class="QLineEdit" name="lineEditName">
+     <property name="inputMask">
+      <string/>
+     </property>
+    </widget>
+   </item>
+   <item row="0" column="3">
+    <widget class="QCheckBox" name="chkEnabled">
+     <property name="text">
+      <string>&amp;Enabled</string>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="0">
+    <widget class="QLabel" name="label_2">
+     <property name="maximumSize">
+      <size>
+       <width>56</width>
+       <height>16777215</height>
+      </size>
+     </property>
+     <property name="text">
+      <string>File:</string>
+     </property>
+     <property name="buddy">
+      <cstring>lblPath</cstring>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="1">
+    <widget class="QLabel" name="lblPath">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="minimumSize">
+      <size>
+       <width>301</width>
+       <height>41</height>
+      </size>
+     </property>
+     <property name="text">
+      <string/>
+     </property>
+     <property name="textFormat">
+      <enum>Qt::PlainText</enum>
+     </property>
+     <property name="alignment">
+      <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignTop</set>
+     </property>
+     <property name="wordWrap">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="3">
+    <widget class="QPushButton" name="btnFile">
+     <property name="maximumSize">
+      <size>
+       <width>31</width>
+       <height>16777215</height>
+      </size>
+     </property>
+     <property name="text">
+      <string>...</string>
+     </property>
+    </widget>
+   </item>
+   <item row="2" column="1">
+    <spacer name="horizontalSpacer">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="sizeHint" stdset="0">
+      <size>
+       <width>116</width>
+       <height>20</height>
+      </size>
+     </property>
+    </spacer>
+   </item>
+   <item row="2" column="2" colspan="2">
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>DialogCartEdit</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>DialogCartEdit</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

app/ui/dlg_SearchDatabase.ui

@@ -1,86 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<ui version="4.0">
- <class>Dialog</class>
- <widget class="QDialog" name="Dialog">
-  <property name="geometry">
-   <rect>
-    <x>0</x>
-    <y>0</y>
-    <width>383</width>
-    <height>270</height>
-   </rect>
-  </property>
-  <property name="windowTitle">
-   <string>Dialog</string>
-  </property>
-  <layout class="QVBoxLayout" name="verticalLayout">
-   <item>
-    <layout class="QGridLayout" name="gridLayout">
-     <item row="0" column="0">
-      <widget class="QLabel" name="label">
-       <property name="text">
-        <string>Title:</string>
-       </property>
-      </widget>
-     </item>
-     <item row="0" column="1">
-      <widget class="QLineEdit" name="searchString"/>
-     </item>
-    </layout>
-   </item>
-   <item>
-    <widget class="QListWidget" name="matchList"/>
-   </item>
-   <item>
-    <widget class="QLabel" name="dbPath">
-     <property name="text">
-      <string/>
-     </property>
-    </widget>
-   </item>
-   <item>
-    <layout class="QHBoxLayout" name="horizontalLayout">
-     <item>
-      <spacer name="horizontalSpacer">
-       <property name="orientation">
-        <enum>Qt::Horizontal</enum>
-       </property>
-       <property name="sizeHint" stdset="0">
-        <size>
-         <width>88</width>
-         <height>20</height>
-        </size>
-       </property>
-      </spacer>
-     </item>
-     <item>
-      <widget class="QPushButton" name="btnAdd">
-       <property name="text">
-        <string>&amp;Add</string>
-       </property>
-       <property name="default">
-        <bool>true</bool>
-       </property>
-      </widget>
-     </item>
-     <item>
-      <widget class="QPushButton" name="btnAddClose">
-       <property name="text">
-        <string>A&amp;dd and close</string>
-       </property>
-      </widget>
-     </item>
-     <item>
-      <widget class="QPushButton" name="btnClose">
-       <property name="text">
-        <string>&amp;Close</string>
-       </property>
-      </widget>
-     </item>
-    </layout>
-   </item>
-  </layout>
- </widget>
- <resources/>
- <connections/>
-</ui>

app/ui/dlg_SelectPlaylist_ui.py

@@ -0,0 +1,34 @@
+# Form implementation generated from reading ui file 'app/ui/dlg_SelectPlaylist.ui'
+#
+# Created by: PyQt6 UI code generator 6.5.0
+#
+# WARNING: Any manual changes made to this file will be lost when pyuic6 is
+# run again.  Do not edit this file unless you know what you are doing.
+
+
+from PyQt6 import QtCore, QtGui, QtWidgets
+
+
+class Ui_dlgSelectPlaylist(object):
+    def setupUi(self, dlgSelectPlaylist):
+        dlgSelectPlaylist.setObjectName("dlgSelectPlaylist")
+        dlgSelectPlaylist.resize(276, 150)
+        self.verticalLayout = QtWidgets.QVBoxLayout(dlgSelectPlaylist)
+        self.verticalLayout.setObjectName("verticalLayout")
+        self.lstPlaylists = QtWidgets.QListWidget(parent=dlgSelectPlaylist)
+        self.lstPlaylists.setObjectName("lstPlaylists")
+        self.verticalLayout.addWidget(self.lstPlaylists)
+        self.buttonBox = QtWidgets.QDialogButtonBox(parent=dlgSelectPlaylist)
+        self.buttonBox.setOrientation(QtCore.Qt.Orientation.Horizontal)
+        self.buttonBox.setStandardButtons(QtWidgets.QDialogButtonBox.StandardButton.Cancel|QtWidgets.QDialogButtonBox.StandardButton.Ok)
+        self.buttonBox.setObjectName("buttonBox")
+        self.verticalLayout.addWidget(self.buttonBox)
+
+        self.retranslateUi(dlgSelectPlaylist)
+        self.buttonBox.accepted.connect(dlgSelectPlaylist.accept) # type: ignore
+        self.buttonBox.rejected.connect(dlgSelectPlaylist.reject) # type: ignore
+        QtCore.QMetaObject.connectSlotsByName(dlgSelectPlaylist)
+
+    def retranslateUi(self, dlgSelectPlaylist):
+        _translate = QtCore.QCoreApplication.translate
+        dlgSelectPlaylist.setWindowTitle(_translate("dlgSelectPlaylist", "Dialog"))

app/ui/dlg_TrackSelect.ui

@@ -0,0 +1,131 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>Dialog</class>
+ <widget class="QDialog" name="Dialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>584</width>
+    <height>377</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Dialog</string>
+  </property>
+  <layout class="QGridLayout" name="gridLayout">
+   <item row="0" column="0">
+    <widget class="QLabel" name="label">
+     <property name="text">
+      <string>Title:</string>
+     </property>
+    </widget>
+   </item>
+   <item row="0" column="1">
+    <widget class="QLineEdit" name="searchString"/>
+   </item>
+   <item row="1" column="0" colspan="2">
+    <widget class="QListWidget" name="matchList"/>
+   </item>
+   <item row="2" column="0" colspan="2">
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QLabel" name="lblNote">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="maximumSize">
+        <size>
+         <width>46</width>
+         <height>16777215</height>
+        </size>
+       </property>
+       <property name="text">
+        <string>&amp;Note:</string>
+       </property>
+       <property name="alignment">
+        <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignTop</set>
+       </property>
+       <property name="buddy">
+        <cstring>txtNote</cstring>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLineEdit" name="txtNote"/>
+     </item>
+    </layout>
+   </item>
+   <item row="3" column="0" colspan="2">
+    <widget class="QLabel" name="dbPath">
+     <property name="text">
+      <string/>
+     </property>
+    </widget>
+   </item>
+   <item row="4" column="0" colspan="2">
+    <layout class="QHBoxLayout" name="horizontalLayout_2">
+     <item>
+      <widget class="QRadioButton" name="radioTitle">
+       <property name="text">
+        <string>&amp;Title</string>
+       </property>
+       <property name="checked">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QRadioButton" name="radioArtist">
+       <property name="text">
+        <string>&amp;Artist</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <spacer name="horizontalSpacer_2">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <widget class="QPushButton" name="btnAdd">
+       <property name="text">
+        <string>&amp;Add</string>
+       </property>
+       <property name="default">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="btnAddClose">
+       <property name="text">
+        <string>A&amp;dd and close</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="btnClose">
+       <property name="text">
+        <string>&amp;Close</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

app/ui/dlg_TrackSelect_ui.py

@@ -0,0 +1,83 @@
+# Form implementation generated from reading ui file 'dlg_TrackSelect.ui'
+#
+# Created by: PyQt6 UI code generator 6.5.3
+#
+# WARNING: Any manual changes made to this file will be lost when pyuic6 is
+# run again.  Do not edit this file unless you know what you are doing.
+
+
+from PyQt6 import QtCore, QtGui, QtWidgets
+
+
+class Ui_Dialog(object):
+    def setupUi(self, Dialog):
+        Dialog.setObjectName("Dialog")
+        Dialog.resize(584, 377)
+        self.gridLayout = QtWidgets.QGridLayout(Dialog)
+        self.gridLayout.setObjectName("gridLayout")
+        self.label = QtWidgets.QLabel(parent=Dialog)
+        self.label.setObjectName("label")
+        self.gridLayout.addWidget(self.label, 0, 0, 1, 1)
+        self.searchString = QtWidgets.QLineEdit(parent=Dialog)
+        self.searchString.setObjectName("searchString")
+        self.gridLayout.addWidget(self.searchString, 0, 1, 1, 1)
+        self.matchList = QtWidgets.QListWidget(parent=Dialog)
+        self.matchList.setObjectName("matchList")
+        self.gridLayout.addWidget(self.matchList, 1, 0, 1, 2)
+        self.horizontalLayout = QtWidgets.QHBoxLayout()
+        self.horizontalLayout.setObjectName("horizontalLayout")
+        self.lblNote = QtWidgets.QLabel(parent=Dialog)
+        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Policy.Fixed, QtWidgets.QSizePolicy.Policy.Preferred)
+        sizePolicy.setHorizontalStretch(0)
+        sizePolicy.setVerticalStretch(0)
+        sizePolicy.setHeightForWidth(self.lblNote.sizePolicy().hasHeightForWidth())
+        self.lblNote.setSizePolicy(sizePolicy)
+        self.lblNote.setMaximumSize(QtCore.QSize(46, 16777215))
+        self.lblNote.setAlignment(QtCore.Qt.AlignmentFlag.AlignLeading|QtCore.Qt.AlignmentFlag.AlignLeft|QtCore.Qt.AlignmentFlag.AlignTop)
+        self.lblNote.setObjectName("lblNote")
+        self.horizontalLayout.addWidget(self.lblNote)
+        self.txtNote = QtWidgets.QLineEdit(parent=Dialog)
+        self.txtNote.setObjectName("txtNote")
+        self.horizontalLayout.addWidget(self.txtNote)
+        self.gridLayout.addLayout(self.horizontalLayout, 2, 0, 1, 2)
+        self.dbPath = QtWidgets.QLabel(parent=Dialog)
+        self.dbPath.setText("")
+        self.dbPath.setObjectName("dbPath")
+        self.gridLayout.addWidget(self.dbPath, 3, 0, 1, 2)
+        self.horizontalLayout_2 = QtWidgets.QHBoxLayout()
+        self.horizontalLayout_2.setObjectName("horizontalLayout_2")
+        self.radioTitle = QtWidgets.QRadioButton(parent=Dialog)
+        self.radioTitle.setChecked(True)
+        self.radioTitle.setObjectName("radioTitle")
+        self.horizontalLayout_2.addWidget(self.radioTitle)
+        self.radioArtist = QtWidgets.QRadioButton(parent=Dialog)
+        self.radioArtist.setObjectName("radioArtist")
+        self.horizontalLayout_2.addWidget(self.radioArtist)
+        spacerItem = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Policy.Expanding, QtWidgets.QSizePolicy.Policy.Minimum)
+        self.horizontalLayout_2.addItem(spacerItem)
+        self.btnAdd = QtWidgets.QPushButton(parent=Dialog)
+        self.btnAdd.setDefault(True)
+        self.btnAdd.setObjectName("btnAdd")
+        self.horizontalLayout_2.addWidget(self.btnAdd)
+        self.btnAddClose = QtWidgets.QPushButton(parent=Dialog)
+        self.btnAddClose.setObjectName("btnAddClose")
+        self.horizontalLayout_2.addWidget(self.btnAddClose)
+        self.btnClose = QtWidgets.QPushButton(parent=Dialog)
+        self.btnClose.setObjectName("btnClose")
+        self.horizontalLayout_2.addWidget(self.btnClose)
+        self.gridLayout.addLayout(self.horizontalLayout_2, 4, 0, 1, 2)
+        self.lblNote.setBuddy(self.txtNote)
+
+        self.retranslateUi(Dialog)
+        QtCore.QMetaObject.connectSlotsByName(Dialog)
+
+    def retranslateUi(self, Dialog):
+        _translate = QtCore.QCoreApplication.translate
+        Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
+        self.label.setText(_translate("Dialog", "Title:"))
+        self.lblNote.setText(_translate("Dialog", "&Note:"))
+        self.radioTitle.setText(_translate("Dialog", "&Title"))
+        self.radioArtist.setText(_translate("Dialog", "&Artist"))
+        self.btnAdd.setText(_translate("Dialog", "&Add"))
+        self.btnAddClose.setText(_translate("Dialog", "A&dd and close"))
+        self.btnClose.setText(_translate("Dialog", "&Close"))

app/ui/dlg_cart_ui.py

@@ -0,0 +1,71 @@
+# Form implementation generated from reading ui file 'dlg_Cart.ui'
+#
+# Created by: PyQt6 UI code generator 6.5.3
+#
+# WARNING: Any manual changes made to this file will be lost when pyuic6 is
+# run again.  Do not edit this file unless you know what you are doing.
+
+
+from PyQt6 import QtCore, QtGui, QtWidgets
+
+
+class Ui_DialogCartEdit(object):
+    def setupUi(self, DialogCartEdit):
+        DialogCartEdit.setObjectName("DialogCartEdit")
+        DialogCartEdit.resize(564, 148)
+        self.gridLayout = QtWidgets.QGridLayout(DialogCartEdit)
+        self.gridLayout.setObjectName("gridLayout")
+        self.label = QtWidgets.QLabel(parent=DialogCartEdit)
+        self.label.setMaximumSize(QtCore.QSize(56, 16777215))
+        self.label.setObjectName("label")
+        self.gridLayout.addWidget(self.label, 0, 0, 1, 1)
+        self.lineEditName = QtWidgets.QLineEdit(parent=DialogCartEdit)
+        self.lineEditName.setInputMask("")
+        self.lineEditName.setObjectName("lineEditName")
+        self.gridLayout.addWidget(self.lineEditName, 0, 1, 1, 2)
+        self.chkEnabled = QtWidgets.QCheckBox(parent=DialogCartEdit)
+        self.chkEnabled.setObjectName("chkEnabled")
+        self.gridLayout.addWidget(self.chkEnabled, 0, 3, 1, 1)
+        self.label_2 = QtWidgets.QLabel(parent=DialogCartEdit)
+        self.label_2.setMaximumSize(QtCore.QSize(56, 16777215))
+        self.label_2.setObjectName("label_2")
+        self.gridLayout.addWidget(self.label_2, 1, 0, 1, 1)
+        self.lblPath = QtWidgets.QLabel(parent=DialogCartEdit)
+        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Policy.Preferred, QtWidgets.QSizePolicy.Policy.Preferred)
+        sizePolicy.setHorizontalStretch(0)
+        sizePolicy.setVerticalStretch(0)
+        sizePolicy.setHeightForWidth(self.lblPath.sizePolicy().hasHeightForWidth())
+        self.lblPath.setSizePolicy(sizePolicy)
+        self.lblPath.setMinimumSize(QtCore.QSize(301, 41))
+        self.lblPath.setText("")
+        self.lblPath.setTextFormat(QtCore.Qt.TextFormat.PlainText)
+        self.lblPath.setAlignment(QtCore.Qt.AlignmentFlag.AlignLeading|QtCore.Qt.AlignmentFlag.AlignLeft|QtCore.Qt.AlignmentFlag.AlignTop)
+        self.lblPath.setWordWrap(True)
+        self.lblPath.setObjectName("lblPath")
+        self.gridLayout.addWidget(self.lblPath, 1, 1, 1, 1)
+        self.btnFile = QtWidgets.QPushButton(parent=DialogCartEdit)
+        self.btnFile.setMaximumSize(QtCore.QSize(31, 16777215))
+        self.btnFile.setObjectName("btnFile")
+        self.gridLayout.addWidget(self.btnFile, 1, 3, 1, 1)
+        spacerItem = QtWidgets.QSpacerItem(116, 20, QtWidgets.QSizePolicy.Policy.Expanding, QtWidgets.QSizePolicy.Policy.Minimum)
+        self.gridLayout.addItem(spacerItem, 2, 1, 1, 1)
+        self.buttonBox = QtWidgets.QDialogButtonBox(parent=DialogCartEdit)
+        self.buttonBox.setOrientation(QtCore.Qt.Orientation.Horizontal)
+        self.buttonBox.setStandardButtons(QtWidgets.QDialogButtonBox.StandardButton.Cancel|QtWidgets.QDialogButtonBox.StandardButton.Ok)
+        self.buttonBox.setObjectName("buttonBox")
+        self.gridLayout.addWidget(self.buttonBox, 2, 2, 1, 2)
+        self.label.setBuddy(self.lineEditName)
+        self.label_2.setBuddy(self.lblPath)
+
+        self.retranslateUi(DialogCartEdit)
+        self.buttonBox.accepted.connect(DialogCartEdit.accept) # type: ignore
+        self.buttonBox.rejected.connect(DialogCartEdit.reject) # type: ignore
+        QtCore.QMetaObject.connectSlotsByName(DialogCartEdit)
+
+    def retranslateUi(self, DialogCartEdit):
+        _translate = QtCore.QCoreApplication.translate
+        DialogCartEdit.setWindowTitle(_translate("DialogCartEdit", "Carts"))
+        self.label.setText(_translate("DialogCartEdit", "&Name:"))
+        self.chkEnabled.setText(_translate("DialogCartEdit", "&Enabled"))
+        self.label_2.setText(_translate("DialogCartEdit", "File:"))
+        self.btnFile.setText(_translate("DialogCartEdit", "..."))

app/ui/dlg_replace_files_ui.py

@@ -0,0 +1,53 @@
+# Form implementation generated from reading ui file 'app/ui/dlgReplaceFiles.ui'
+#
+# Created by: PyQt6 UI code generator 6.7.0
+#
+# WARNING: Any manual changes made to this file will be lost when pyuic6 is
+# run again.  Do not edit this file unless you know what you are doing.
+
+
+from PyQt6 import QtCore, QtGui, QtWidgets
+
+
+class Ui_Dialog(object):
+    def setupUi(self, Dialog):
+        Dialog.setObjectName("Dialog")
+        Dialog.resize(1038, 774)
+        self.buttonBox = QtWidgets.QDialogButtonBox(parent=Dialog)
+        self.buttonBox.setGeometry(QtCore.QRect(680, 730, 341, 32))
+        self.buttonBox.setOrientation(QtCore.Qt.Orientation.Horizontal)
+        self.buttonBox.setStandardButtons(QtWidgets.QDialogButtonBox.StandardButton.Cancel|QtWidgets.QDialogButtonBox.StandardButton.Ok)
+        self.buttonBox.setObjectName("buttonBox")
+        self.label = QtWidgets.QLabel(parent=Dialog)
+        self.label.setGeometry(QtCore.QRect(10, 15, 181, 24))
+        self.label.setAlignment(QtCore.Qt.AlignmentFlag.AlignRight|QtCore.Qt.AlignmentFlag.AlignTrailing|QtCore.Qt.AlignmentFlag.AlignVCenter)
+        self.label.setObjectName("label")
+        self.label_2 = QtWidgets.QLabel(parent=Dialog)
+        self.label_2.setGeometry(QtCore.QRect(10, 50, 181, 24))
+        self.label_2.setAlignment(QtCore.Qt.AlignmentFlag.AlignRight|QtCore.Qt.AlignmentFlag.AlignTrailing|QtCore.Qt.AlignmentFlag.AlignVCenter)
+        self.label_2.setObjectName("label_2")
+        self.lblSourceDirectory = QtWidgets.QLabel(parent=Dialog)
+        self.lblSourceDirectory.setGeometry(QtCore.QRect(200, 15, 811, 24))
+        self.lblSourceDirectory.setObjectName("lblSourceDirectory")
+        self.lblDestinationDirectory = QtWidgets.QLabel(parent=Dialog)
+        self.lblDestinationDirectory.setGeometry(QtCore.QRect(200, 50, 811, 24))
+        self.lblDestinationDirectory.setObjectName("lblDestinationDirectory")
+        self.tableWidget = QtWidgets.QTableWidget(parent=Dialog)
+        self.tableWidget.setGeometry(QtCore.QRect(20, 90, 1001, 621))
+        self.tableWidget.setAlternatingRowColors(True)
+        self.tableWidget.setColumnCount(3)
+        self.tableWidget.setObjectName("tableWidget")
+        self.tableWidget.setRowCount(0)
+
+        self.retranslateUi(Dialog)
+        self.buttonBox.accepted.connect(Dialog.accept) # type: ignore
+        self.buttonBox.rejected.connect(Dialog.reject) # type: ignore
+        QtCore.QMetaObject.connectSlotsByName(Dialog)
+
+    def retranslateUi(self, Dialog):
+        _translate = QtCore.QCoreApplication.translate
+        Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
+        self.label.setText(_translate("Dialog", "Source directory:"))
+        self.label_2.setText(_translate("Dialog", "Destination directory:"))
+        self.lblSourceDirectory.setText(_translate("Dialog", "lblSourceDirectory"))
+        self.lblDestinationDirectory.setText(_translate("Dialog", "lblDestinationDirectory"))

app/ui/downloadcsv.ui

@@ -0,0 +1,107 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>DateSelect</class>
+ <widget class="QDialog" name="DateSelect">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>280</width>
+    <height>166</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Dialog</string>
+  </property>
+  <widget class="QDialogButtonBox" name="buttonBox">
+   <property name="geometry">
+    <rect>
+     <x>70</x>
+     <y>110</y>
+     <width>191</width>
+     <height>32</height>
+    </rect>
+   </property>
+   <property name="orientation">
+    <enum>Qt::Horizontal</enum>
+   </property>
+   <property name="standardButtons">
+    <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+   </property>
+  </widget>
+  <widget class="QDateTimeEdit" name="dateTimeEdit">
+   <property name="geometry">
+    <rect>
+     <x>70</x>
+     <y>60</y>
+     <width>194</width>
+     <height>28</height>
+    </rect>
+   </property>
+   <property name="calendarPopup">
+    <bool>true</bool>
+   </property>
+  </widget>
+  <widget class="QLabel" name="label">
+   <property name="geometry">
+    <rect>
+     <x>10</x>
+     <y>20</y>
+     <width>261</width>
+     <height>19</height>
+    </rect>
+   </property>
+   <property name="text">
+    <string>Download CSV of tracks played</string>
+   </property>
+  </widget>
+  <widget class="QLabel" name="label_2">
+   <property name="geometry">
+    <rect>
+     <x>15</x>
+     <y>66</y>
+     <width>51</width>
+     <height>19</height>
+    </rect>
+   </property>
+   <property name="text">
+    <string>Since:</string>
+   </property>
+  </widget>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>DateSelect</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>DateSelect</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

app/ui/downloadcsv_ui.py

@@ -0,0 +1,41 @@
+# Form implementation generated from reading ui file 'app/ui/downloadcsv.ui'
+#
+# Created by: PyQt6 UI code generator 6.5.0
+#
+# WARNING: Any manual changes made to this file will be lost when pyuic6 is
+# run again.  Do not edit this file unless you know what you are doing.
+
+
+from PyQt6 import QtCore, QtGui, QtWidgets
+
+
+class Ui_DateSelect(object):
+    def setupUi(self, DateSelect):
+        DateSelect.setObjectName("DateSelect")
+        DateSelect.resize(280, 166)
+        self.buttonBox = QtWidgets.QDialogButtonBox(parent=DateSelect)
+        self.buttonBox.setGeometry(QtCore.QRect(70, 110, 191, 32))
+        self.buttonBox.setOrientation(QtCore.Qt.Orientation.Horizontal)
+        self.buttonBox.setStandardButtons(QtWidgets.QDialogButtonBox.StandardButton.Cancel|QtWidgets.QDialogButtonBox.StandardButton.Ok)
+        self.buttonBox.setObjectName("buttonBox")
+        self.dateTimeEdit = QtWidgets.QDateTimeEdit(parent=DateSelect)
+        self.dateTimeEdit.setGeometry(QtCore.QRect(70, 60, 194, 28))
+        self.dateTimeEdit.setCalendarPopup(True)
+        self.dateTimeEdit.setObjectName("dateTimeEdit")
+        self.label = QtWidgets.QLabel(parent=DateSelect)
+        self.label.setGeometry(QtCore.QRect(10, 20, 261, 19))
+        self.label.setObjectName("label")
+        self.label_2 = QtWidgets.QLabel(parent=DateSelect)
+        self.label_2.setGeometry(QtCore.QRect(15, 66, 51, 19))
+        self.label_2.setObjectName("label_2")
+
+        self.retranslateUi(DateSelect)
+        self.buttonBox.accepted.connect(DateSelect.accept) # type: ignore
+        self.buttonBox.rejected.connect(DateSelect.reject) # type: ignore
+        QtCore.QMetaObject.connectSlotsByName(DateSelect)
+
+    def retranslateUi(self, DateSelect):
+        _translate = QtCore.QCoreApplication.translate
+        DateSelect.setWindowTitle(_translate("DateSelect", "Dialog"))
+        self.label.setText(_translate("DateSelect", "Download CSV of tracks played"))
+        self.label_2.setText(_translate("DateSelect", "Since:"))

app/ui/icons.qrc

@@ -1,5 +1,14 @@
 <RCC>
   <qresource prefix="icons">
+    <file>yellow-circle.png</file>
+    <file>redstar.png</file>
+    <file>green-circle.png</file>
+    <file>star.png</file>
+    <file>star_empty.png</file>
+    <file>record-red-button.png</file>
+    <file>record-button.png</file>
+    <file alias="headphones">headphone-symbol.png</file>
+    <file alias="musicmuster">musicmuster.png</file>
     <file alias="stopsign">stopsign.png</file>
     <file alias="wikipedia">wikipedia-logo.png</file>
     <file alias="songsearch">songsearch_icon.png</file>

app/ui/main_window_footer.ui

@@ -0,0 +1,589 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>FooterSection</class>
+ <widget class="QWidget" name="FooterSection">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>1237</width>
+    <height>154</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Form</string>
+  </property>
+  <layout class="QHBoxLayout" name="horizontalLayout_2">
+   <item>
+    <widget class="QFrame" name="InfoFooterFrame">
+     <property name="maximumSize">
+      <size>
+       <width>16777215</width>
+       <height>16777215</height>
+      </size>
+     </property>
+     <property name="styleSheet">
+      <string notr="true">background-color: rgb(192, 191, 188)</string>
+     </property>
+     <property name="frameShape">
+      <enum>QFrame::StyledPanel</enum>
+     </property>
+     <property name="frameShadow">
+      <enum>QFrame::Raised</enum>
+     </property>
+     <layout class="QHBoxLayout" name="horizontalLayout">
+      <item>
+       <widget class="QFrame" name="FadeStopInfoFrame">
+        <property name="minimumSize">
+         <size>
+          <width>152</width>
+          <height>112</height>
+         </size>
+        </property>
+        <property name="maximumSize">
+         <size>
+          <width>184</width>
+          <height>16777215</height>
+         </size>
+        </property>
+        <property name="frameShape">
+         <enum>QFrame::StyledPanel</enum>
+        </property>
+        <property name="frameShadow">
+         <enum>QFrame::Raised</enum>
+        </property>
+        <layout class="QVBoxLayout" name="verticalLayout_4">
+         <item>
+          <widget class="QPushButton" name="btnPreview">
+           <property name="minimumSize">
+            <size>
+             <width>132</width>
+             <height>41</height>
+            </size>
+           </property>
+           <property name="text">
+            <string>  Preview</string>
+           </property>
+           <property name="icon">
+            <iconset resource="icons.qrc">
+             <normaloff>:/icons/headphones</normaloff>:/icons/headphones</iconset>
+           </property>
+           <property name="iconSize">
+            <size>
+             <width>30</width>
+             <height>30</height>
+            </size>
+           </property>
+           <property name="checkable">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QGroupBox" name="groupBoxIntroControls">
+           <property name="minimumSize">
+            <size>
+             <width>132</width>
+             <height>46</height>
+            </size>
+           </property>
+           <property name="maximumSize">
+            <size>
+             <width>132</width>
+             <height>46</height>
+            </size>
+           </property>
+           <property name="title">
+            <string/>
+           </property>
+           <widget class="QPushButton" name="btnPreviewStart">
+            <property name="geometry">
+             <rect>
+              <x>0</x>
+              <y>0</y>
+              <width>44</width>
+              <height>23</height>
+             </rect>
+            </property>
+            <property name="minimumSize">
+             <size>
+              <width>44</width>
+              <height>23</height>
+             </size>
+            </property>
+            <property name="maximumSize">
+             <size>
+              <width>44</width>
+              <height>23</height>
+             </size>
+            </property>
+            <property name="text">
+             <string>&lt;&lt;</string>
+            </property>
+           </widget>
+           <widget class="QPushButton" name="btnPreviewArm">
+            <property name="geometry">
+             <rect>
+              <x>44</x>
+              <y>0</y>
+              <width>44</width>
+              <height>23</height>
+             </rect>
+            </property>
+            <property name="minimumSize">
+             <size>
+              <width>44</width>
+              <height>23</height>
+             </size>
+            </property>
+            <property name="maximumSize">
+             <size>
+              <width>44</width>
+              <height>23</height>
+             </size>
+            </property>
+            <property name="text">
+             <string/>
+            </property>
+            <property name="icon">
+             <iconset resource="icons.qrc">
+              <normaloff>:/icons/record-button.png</normaloff>
+              <normalon>:/icons/record-red-button.png</normalon>:/icons/record-button.png</iconset>
+            </property>
+            <property name="checkable">
+             <bool>true</bool>
+            </property>
+           </widget>
+           <widget class="QPushButton" name="btnPreviewEnd">
+            <property name="geometry">
+             <rect>
+              <x>88</x>
+              <y>0</y>
+              <width>44</width>
+              <height>23</height>
+             </rect>
+            </property>
+            <property name="minimumSize">
+             <size>
+              <width>44</width>
+              <height>23</height>
+             </size>
+            </property>
+            <property name="maximumSize">
+             <size>
+              <width>44</width>
+              <height>23</height>
+             </size>
+            </property>
+            <property name="text">
+             <string>&gt;&gt;</string>
+            </property>
+           </widget>
+           <widget class="QPushButton" name="btnPreviewBack">
+            <property name="geometry">
+             <rect>
+              <x>0</x>
+              <y>23</y>
+              <width>44</width>
+              <height>23</height>
+             </rect>
+            </property>
+            <property name="minimumSize">
+             <size>
+              <width>44</width>
+              <height>23</height>
+             </size>
+            </property>
+            <property name="maximumSize">
+             <size>
+              <width>44</width>
+              <height>23</height>
+             </size>
+            </property>
+            <property name="text">
+             <string>&lt;</string>
+            </property>
+           </widget>
+           <widget class="QPushButton" name="btnPreviewMark">
+            <property name="enabled">
+             <bool>false</bool>
+            </property>
+            <property name="geometry">
+             <rect>
+              <x>44</x>
+              <y>23</y>
+              <width>44</width>
+              <height>23</height>
+             </rect>
+            </property>
+            <property name="minimumSize">
+             <size>
+              <width>44</width>
+              <height>23</height>
+             </size>
+            </property>
+            <property name="maximumSize">
+             <size>
+              <width>44</width>
+              <height>23</height>
+             </size>
+            </property>
+            <property name="text">
+             <string/>
+            </property>
+            <property name="icon">
+             <iconset>
+              <normalon>:/icons/star.png</normalon>
+              <disabledoff>:/icons/star_empty.png</disabledoff>
+             </iconset>
+            </property>
+           </widget>
+           <widget class="QPushButton" name="btnPreviewFwd">
+            <property name="geometry">
+             <rect>
+              <x>88</x>
+              <y>23</y>
+              <width>44</width>
+              <height>23</height>
+             </rect>
+            </property>
+            <property name="minimumSize">
+             <size>
+              <width>44</width>
+              <height>23</height>
+             </size>
+            </property>
+            <property name="maximumSize">
+             <size>
+              <width>44</width>
+              <height>23</height>
+             </size>
+            </property>
+            <property name="text">
+             <string>&gt;</string>
+            </property>
+           </widget>
+          </widget>
+         </item>
+        </layout>
+       </widget>
+      </item>
+      <item>
+       <widget class="QFrame" name="frame_intro">
+        <property name="minimumSize">
+         <size>
+          <width>152</width>
+          <height>112</height>
+         </size>
+        </property>
+        <property name="styleSheet">
+         <string notr="true"/>
+        </property>
+        <property name="frameShape">
+         <enum>QFrame::StyledPanel</enum>
+        </property>
+        <property name="frameShadow">
+         <enum>QFrame::Raised</enum>
+        </property>
+        <layout class="QVBoxLayout" name="verticalLayout_9">
+         <item>
+          <widget class="QLabel" name="label_7">
+           <property name="text">
+            <string>Intro</string>
+           </property>
+           <property name="alignment">
+            <set>Qt::AlignCenter</set>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QLabel" name="label_intro_timer">
+           <property name="font">
+            <font>
+             <family>FreeSans</family>
+             <pointsize>40</pointsize>
+             <weight>50</weight>
+             <bold>false</bold>
+            </font>
+           </property>
+           <property name="text">
+            <string>0:0</string>
+           </property>
+           <property name="alignment">
+            <set>Qt::AlignCenter</set>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </widget>
+      </item>
+      <item>
+       <widget class="QFrame" name="frame_toggleplayed_3db">
+        <property name="minimumSize">
+         <size>
+          <width>152</width>
+          <height>112</height>
+         </size>
+        </property>
+        <property name="maximumSize">
+         <size>
+          <width>184</width>
+          <height>16777215</height>
+         </size>
+        </property>
+        <property name="frameShape">
+         <enum>QFrame::StyledPanel</enum>
+        </property>
+        <property name="frameShadow">
+         <enum>QFrame::Raised</enum>
+        </property>
+        <layout class="QVBoxLayout" name="verticalLayout_6">
+         <item>
+          <widget class="QPushButton" name="btnDrop3db">
+           <property name="minimumSize">
+            <size>
+             <width>132</width>
+             <height>41</height>
+            </size>
+           </property>
+           <property name="maximumSize">
+            <size>
+             <width>164</width>
+             <height>16777215</height>
+            </size>
+           </property>
+           <property name="text">
+            <string>-3dB to talk</string>
+           </property>
+           <property name="checkable">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QPushButton" name="btnHidePlayed">
+           <property name="minimumSize">
+            <size>
+             <width>132</width>
+             <height>41</height>
+            </size>
+           </property>
+           <property name="maximumSize">
+            <size>
+             <width>164</width>
+             <height>16777215</height>
+            </size>
+           </property>
+           <property name="text">
+            <string>Hide played</string>
+           </property>
+           <property name="checkable">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </widget>
+      </item>
+      <item>
+       <widget class="QFrame" name="frame_fade">
+        <property name="minimumSize">
+         <size>
+          <width>152</width>
+          <height>112</height>
+         </size>
+        </property>
+        <property name="styleSheet">
+         <string notr="true"/>
+        </property>
+        <property name="frameShape">
+         <enum>QFrame::StyledPanel</enum>
+        </property>
+        <property name="frameShadow">
+         <enum>QFrame::Raised</enum>
+        </property>
+        <layout class="QVBoxLayout" name="verticalLayout_2">
+         <item>
+          <widget class="QLabel" name="label_4">
+           <property name="text">
+            <string>Fade</string>
+           </property>
+           <property name="alignment">
+            <set>Qt::AlignCenter</set>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QLabel" name="label_fade_timer">
+           <property name="font">
+            <font>
+             <family>FreeSans</family>
+             <pointsize>40</pointsize>
+             <weight>50</weight>
+             <bold>false</bold>
+            </font>
+           </property>
+           <property name="text">
+            <string>00:00</string>
+           </property>
+           <property name="alignment">
+            <set>Qt::AlignCenter</set>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </widget>
+      </item>
+      <item>
+       <widget class="QFrame" name="frame_silent">
+        <property name="minimumSize">
+         <size>
+          <width>152</width>
+          <height>112</height>
+         </size>
+        </property>
+        <property name="styleSheet">
+         <string notr="true"/>
+        </property>
+        <property name="frameShape">
+         <enum>QFrame::StyledPanel</enum>
+        </property>
+        <property name="frameShadow">
+         <enum>QFrame::Raised</enum>
+        </property>
+        <layout class="QVBoxLayout" name="verticalLayout_7">
+         <item>
+          <widget class="QLabel" name="label_5">
+           <property name="text">
+            <string>Silent</string>
+           </property>
+           <property name="alignment">
+            <set>Qt::AlignCenter</set>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QLabel" name="label_silent_timer">
+           <property name="font">
+            <font>
+             <family>FreeSans</family>
+             <pointsize>40</pointsize>
+             <weight>50</weight>
+             <bold>false</bold>
+            </font>
+           </property>
+           <property name="text">
+            <string>00:00</string>
+           </property>
+           <property name="alignment">
+            <set>Qt::AlignCenter</set>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </widget>
+      </item>
+      <item>
+       <widget class="PlotWidget" name="widgetFadeVolume" native="true">
+        <property name="sizePolicy">
+         <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+          <horstretch>1</horstretch>
+          <verstretch>0</verstretch>
+         </sizepolicy>
+        </property>
+        <property name="minimumSize">
+         <size>
+          <width>0</width>
+          <height>0</height>
+         </size>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QFrame" name="frame">
+        <property name="minimumSize">
+         <size>
+          <width>151</width>
+          <height>0</height>
+         </size>
+        </property>
+        <property name="maximumSize">
+         <size>
+          <width>151</width>
+          <height>112</height>
+         </size>
+        </property>
+        <property name="frameShape">
+         <enum>QFrame::StyledPanel</enum>
+        </property>
+        <property name="frameShadow">
+         <enum>QFrame::Raised</enum>
+        </property>
+        <layout class="QVBoxLayout" name="verticalLayout_5">
+         <item>
+          <widget class="QPushButton" name="btnFade">
+           <property name="minimumSize">
+            <size>
+             <width>132</width>
+             <height>32</height>
+            </size>
+           </property>
+           <property name="maximumSize">
+            <size>
+             <width>164</width>
+             <height>16777215</height>
+            </size>
+           </property>
+           <property name="text">
+            <string>  Fade</string>
+           </property>
+           <property name="icon">
+            <iconset resource="icons.qrc">
+             <normaloff>:/icons/fade</normaloff>:/icons/fade</iconset>
+           </property>
+           <property name="iconSize">
+            <size>
+             <width>30</width>
+             <height>30</height>
+            </size>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QPushButton" name="btnStop">
+           <property name="minimumSize">
+            <size>
+             <width>0</width>
+             <height>36</height>
+            </size>
+           </property>
+           <property name="text">
+            <string>  Stop</string>
+           </property>
+           <property name="icon">
+            <iconset resource="icons.qrc">
+             <normaloff>:/icons/stopsign</normaloff>:/icons/stopsign</iconset>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </widget>
+      </item>
+     </layout>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>PlotWidget</class>
+   <extends>QWidget</extends>
+   <header>pyqtgraph</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <resources>
+  <include location="icons.qrc"/>
+ </resources>
+ <connections/>
+</ui>

app/ui/main_window_footer_ui.py

@@ -0,0 +1,274 @@
+# Form implementation generated from reading ui file 'app/ui/main_window_footer.ui'
+#
+# Created by: PyQt6 UI code generator 6.8.1
+#
+# WARNING: Any manual changes made to this file will be lost when pyuic6 is
+# run again.  Do not edit this file unless you know what you are doing.
+
+
+from PyQt6 import QtCore, QtGui, QtWidgets
+
+
+class Ui_FooterSection(object):
+    def setupUi(self, FooterSection):
+        FooterSection.setObjectName("FooterSection")
+        FooterSection.resize(1237, 154)
+        self.horizontalLayout_2 = QtWidgets.QHBoxLayout(FooterSection)
+        self.horizontalLayout_2.setObjectName("horizontalLayout_2")
+        self.InfoFooterFrame = QtWidgets.QFrame(parent=FooterSection)
+        self.InfoFooterFrame.setMaximumSize(QtCore.QSize(16777215, 16777215))
+        self.InfoFooterFrame.setStyleSheet("background-color: rgb(192, 191, 188)")
+        self.InfoFooterFrame.setFrameShape(QtWidgets.QFrame.Shape.StyledPanel)
+        self.InfoFooterFrame.setFrameShadow(QtWidgets.QFrame.Shadow.Raised)
+        self.InfoFooterFrame.setObjectName("InfoFooterFrame")
+        self.horizontalLayout = QtWidgets.QHBoxLayout(self.InfoFooterFrame)
+        self.horizontalLayout.setObjectName("horizontalLayout")
+        self.FadeStopInfoFrame = QtWidgets.QFrame(parent=self.InfoFooterFrame)
+        self.FadeStopInfoFrame.setMinimumSize(QtCore.QSize(152, 112))
+        self.FadeStopInfoFrame.setMaximumSize(QtCore.QSize(184, 16777215))
+        self.FadeStopInfoFrame.setFrameShape(QtWidgets.QFrame.Shape.StyledPanel)
+        self.FadeStopInfoFrame.setFrameShadow(QtWidgets.QFrame.Shadow.Raised)
+        self.FadeStopInfoFrame.setObjectName("FadeStopInfoFrame")
+        self.verticalLayout_4 = QtWidgets.QVBoxLayout(self.FadeStopInfoFrame)
+        self.verticalLayout_4.setObjectName("verticalLayout_4")
+        self.btnPreview = QtWidgets.QPushButton(parent=self.FadeStopInfoFrame)
+        self.btnPreview.setMinimumSize(QtCore.QSize(132, 41))
+        icon = QtGui.QIcon()
+        icon.addPixmap(
+            QtGui.QPixmap(":/icons/headphones"),
+            QtGui.QIcon.Mode.Normal,
+            QtGui.QIcon.State.Off,
+        )
+        self.btnPreview.setIcon(icon)
+        self.btnPreview.setIconSize(QtCore.QSize(30, 30))
+        self.btnPreview.setCheckable(True)
+        self.btnPreview.setObjectName("btnPreview")
+        self.verticalLayout_4.addWidget(self.btnPreview)
+        self.groupBoxIntroControls = QtWidgets.QGroupBox(parent=self.FadeStopInfoFrame)
+        self.groupBoxIntroControls.setMinimumSize(QtCore.QSize(132, 46))
+        self.groupBoxIntroControls.setMaximumSize(QtCore.QSize(132, 46))
+        self.groupBoxIntroControls.setTitle("")
+        self.groupBoxIntroControls.setObjectName("groupBoxIntroControls")
+        self.btnPreviewStart = QtWidgets.QPushButton(parent=self.groupBoxIntroControls)
+        self.btnPreviewStart.setGeometry(QtCore.QRect(0, 0, 44, 23))
+        self.btnPreviewStart.setMinimumSize(QtCore.QSize(44, 23))
+        self.btnPreviewStart.setMaximumSize(QtCore.QSize(44, 23))
+        self.btnPreviewStart.setObjectName("btnPreviewStart")
+        self.btnPreviewArm = QtWidgets.QPushButton(parent=self.groupBoxIntroControls)
+        self.btnPreviewArm.setGeometry(QtCore.QRect(44, 0, 44, 23))
+        self.btnPreviewArm.setMinimumSize(QtCore.QSize(44, 23))
+        self.btnPreviewArm.setMaximumSize(QtCore.QSize(44, 23))
+        self.btnPreviewArm.setText("")
+        icon1 = QtGui.QIcon()
+        icon1.addPixmap(
+            QtGui.QPixmap(":/icons/record-button.png"),
+            QtGui.QIcon.Mode.Normal,
+            QtGui.QIcon.State.Off,
+        )
+        icon1.addPixmap(
+            QtGui.QPixmap(":/icons/record-red-button.png"),
+            QtGui.QIcon.Mode.Normal,
+            QtGui.QIcon.State.On,
+        )
+        self.btnPreviewArm.setIcon(icon1)
+        self.btnPreviewArm.setCheckable(True)
+        self.btnPreviewArm.setObjectName("btnPreviewArm")
+        self.btnPreviewEnd = QtWidgets.QPushButton(parent=self.groupBoxIntroControls)
+        self.btnPreviewEnd.setGeometry(QtCore.QRect(88, 0, 44, 23))
+        self.btnPreviewEnd.setMinimumSize(QtCore.QSize(44, 23))
+        self.btnPreviewEnd.setMaximumSize(QtCore.QSize(44, 23))
+        self.btnPreviewEnd.setObjectName("btnPreviewEnd")
+        self.btnPreviewBack = QtWidgets.QPushButton(parent=self.groupBoxIntroControls)
+        self.btnPreviewBack.setGeometry(QtCore.QRect(0, 23, 44, 23))
+        self.btnPreviewBack.setMinimumSize(QtCore.QSize(44, 23))
+        self.btnPreviewBack.setMaximumSize(QtCore.QSize(44, 23))
+        self.btnPreviewBack.setObjectName("btnPreviewBack")
+        self.btnPreviewMark = QtWidgets.QPushButton(parent=self.groupBoxIntroControls)
+        self.btnPreviewMark.setEnabled(False)
+        self.btnPreviewMark.setGeometry(QtCore.QRect(44, 23, 44, 23))
+        self.btnPreviewMark.setMinimumSize(QtCore.QSize(44, 23))
+        self.btnPreviewMark.setMaximumSize(QtCore.QSize(44, 23))
+        self.btnPreviewMark.setText("")
+        icon2 = QtGui.QIcon()
+        icon2.addPixmap(
+            QtGui.QPixmap(":/icons/star.png"),
+            QtGui.QIcon.Mode.Normal,
+            QtGui.QIcon.State.On,
+        )
+        icon2.addPixmap(
+            QtGui.QPixmap(":/icons/star_empty.png"),
+            QtGui.QIcon.Mode.Disabled,
+            QtGui.QIcon.State.Off,
+        )
+        self.btnPreviewMark.setIcon(icon2)
+        self.btnPreviewMark.setObjectName("btnPreviewMark")
+        self.btnPreviewFwd = QtWidgets.QPushButton(parent=self.groupBoxIntroControls)
+        self.btnPreviewFwd.setGeometry(QtCore.QRect(88, 23, 44, 23))
+        self.btnPreviewFwd.setMinimumSize(QtCore.QSize(44, 23))
+        self.btnPreviewFwd.setMaximumSize(QtCore.QSize(44, 23))
+        self.btnPreviewFwd.setObjectName("btnPreviewFwd")
+        self.verticalLayout_4.addWidget(self.groupBoxIntroControls)
+        self.horizontalLayout.addWidget(self.FadeStopInfoFrame)
+        self.frame_intro = QtWidgets.QFrame(parent=self.InfoFooterFrame)
+        self.frame_intro.setMinimumSize(QtCore.QSize(152, 112))
+        self.frame_intro.setStyleSheet("")
+        self.frame_intro.setFrameShape(QtWidgets.QFrame.Shape.StyledPanel)
+        self.frame_intro.setFrameShadow(QtWidgets.QFrame.Shadow.Raised)
+        self.frame_intro.setObjectName("frame_intro")
+        self.verticalLayout_9 = QtWidgets.QVBoxLayout(self.frame_intro)
+        self.verticalLayout_9.setObjectName("verticalLayout_9")
+        self.label_7 = QtWidgets.QLabel(parent=self.frame_intro)
+        self.label_7.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
+        self.label_7.setObjectName("label_7")
+        self.verticalLayout_9.addWidget(self.label_7)
+        self.label_intro_timer = QtWidgets.QLabel(parent=self.frame_intro)
+        font = QtGui.QFont()
+        font.setFamily("FreeSans")
+        font.setPointSize(40)
+        font.setBold(False)
+        font.setWeight(50)
+        self.label_intro_timer.setFont(font)
+        self.label_intro_timer.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
+        self.label_intro_timer.setObjectName("label_intro_timer")
+        self.verticalLayout_9.addWidget(self.label_intro_timer)
+        self.horizontalLayout.addWidget(self.frame_intro)
+        self.frame_toggleplayed_3db = QtWidgets.QFrame(parent=self.InfoFooterFrame)
+        self.frame_toggleplayed_3db.setMinimumSize(QtCore.QSize(152, 112))
+        self.frame_toggleplayed_3db.setMaximumSize(QtCore.QSize(184, 16777215))
+        self.frame_toggleplayed_3db.setFrameShape(QtWidgets.QFrame.Shape.StyledPanel)
+        self.frame_toggleplayed_3db.setFrameShadow(QtWidgets.QFrame.Shadow.Raised)
+        self.frame_toggleplayed_3db.setObjectName("frame_toggleplayed_3db")
+        self.verticalLayout_6 = QtWidgets.QVBoxLayout(self.frame_toggleplayed_3db)
+        self.verticalLayout_6.setObjectName("verticalLayout_6")
+        self.btnDrop3db = QtWidgets.QPushButton(parent=self.frame_toggleplayed_3db)
+        self.btnDrop3db.setMinimumSize(QtCore.QSize(132, 41))
+        self.btnDrop3db.setMaximumSize(QtCore.QSize(164, 16777215))
+        self.btnDrop3db.setCheckable(True)
+        self.btnDrop3db.setObjectName("btnDrop3db")
+        self.verticalLayout_6.addWidget(self.btnDrop3db)
+        self.btnHidePlayed = QtWidgets.QPushButton(parent=self.frame_toggleplayed_3db)
+        self.btnHidePlayed.setMinimumSize(QtCore.QSize(132, 41))
+        self.btnHidePlayed.setMaximumSize(QtCore.QSize(164, 16777215))
+        self.btnHidePlayed.setCheckable(True)
+        self.btnHidePlayed.setObjectName("btnHidePlayed")
+        self.verticalLayout_6.addWidget(self.btnHidePlayed)
+        self.horizontalLayout.addWidget(self.frame_toggleplayed_3db)
+        self.frame_fade = QtWidgets.QFrame(parent=self.InfoFooterFrame)
+        self.frame_fade.setMinimumSize(QtCore.QSize(152, 112))
+        self.frame_fade.setStyleSheet("")
+        self.frame_fade.setFrameShape(QtWidgets.QFrame.Shape.StyledPanel)
+        self.frame_fade.setFrameShadow(QtWidgets.QFrame.Shadow.Raised)
+        self.frame_fade.setObjectName("frame_fade")
+        self.verticalLayout_2 = QtWidgets.QVBoxLayout(self.frame_fade)
+        self.verticalLayout_2.setObjectName("verticalLayout_2")
+        self.label_4 = QtWidgets.QLabel(parent=self.frame_fade)
+        self.label_4.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
+        self.label_4.setObjectName("label_4")
+        self.verticalLayout_2.addWidget(self.label_4)
+        self.label_fade_timer = QtWidgets.QLabel(parent=self.frame_fade)
+        font = QtGui.QFont()
+        font.setFamily("FreeSans")
+        font.setPointSize(40)
+        font.setBold(False)
+        font.setWeight(50)
+        self.label_fade_timer.setFont(font)
+        self.label_fade_timer.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
+        self.label_fade_timer.setObjectName("label_fade_timer")
+        self.verticalLayout_2.addWidget(self.label_fade_timer)
+        self.horizontalLayout.addWidget(self.frame_fade)
+        self.frame_silent = QtWidgets.QFrame(parent=self.InfoFooterFrame)
+        self.frame_silent.setMinimumSize(QtCore.QSize(152, 112))
+        self.frame_silent.setStyleSheet("")
+        self.frame_silent.setFrameShape(QtWidgets.QFrame.Shape.StyledPanel)
+        self.frame_silent.setFrameShadow(QtWidgets.QFrame.Shadow.Raised)
+        self.frame_silent.setObjectName("frame_silent")
+        self.verticalLayout_7 = QtWidgets.QVBoxLayout(self.frame_silent)
+        self.verticalLayout_7.setObjectName("verticalLayout_7")
+        self.label_5 = QtWidgets.QLabel(parent=self.frame_silent)
+        self.label_5.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
+        self.label_5.setObjectName("label_5")
+        self.verticalLayout_7.addWidget(self.label_5)
+        self.label_silent_timer = QtWidgets.QLabel(parent=self.frame_silent)
+        font = QtGui.QFont()
+        font.setFamily("FreeSans")
+        font.setPointSize(40)
+        font.setBold(False)
+        font.setWeight(50)
+        self.label_silent_timer.setFont(font)
+        self.label_silent_timer.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
+        self.label_silent_timer.setObjectName("label_silent_timer")
+        self.verticalLayout_7.addWidget(self.label_silent_timer)
+        self.horizontalLayout.addWidget(self.frame_silent)
+        self.widgetFadeVolume = PlotWidget(parent=self.InfoFooterFrame)
+        sizePolicy = QtWidgets.QSizePolicy(
+            QtWidgets.QSizePolicy.Policy.Preferred,
+            QtWidgets.QSizePolicy.Policy.Preferred,
+        )
+        sizePolicy.setHorizontalStretch(1)
+        sizePolicy.setVerticalStretch(0)
+        sizePolicy.setHeightForWidth(
+            self.widgetFadeVolume.sizePolicy().hasHeightForWidth()
+        )
+        self.widgetFadeVolume.setSizePolicy(sizePolicy)
+        self.widgetFadeVolume.setMinimumSize(QtCore.QSize(0, 0))
+        self.widgetFadeVolume.setObjectName("widgetFadeVolume")
+        self.horizontalLayout.addWidget(self.widgetFadeVolume)
+        self.frame = QtWidgets.QFrame(parent=self.InfoFooterFrame)
+        self.frame.setMinimumSize(QtCore.QSize(151, 0))
+        self.frame.setMaximumSize(QtCore.QSize(151, 112))
+        self.frame.setFrameShape(QtWidgets.QFrame.Shape.StyledPanel)
+        self.frame.setFrameShadow(QtWidgets.QFrame.Shadow.Raised)
+        self.frame.setObjectName("frame")
+        self.verticalLayout_5 = QtWidgets.QVBoxLayout(self.frame)
+        self.verticalLayout_5.setObjectName("verticalLayout_5")
+        self.btnFade = QtWidgets.QPushButton(parent=self.frame)
+        self.btnFade.setMinimumSize(QtCore.QSize(132, 32))
+        self.btnFade.setMaximumSize(QtCore.QSize(164, 16777215))
+        icon3 = QtGui.QIcon()
+        icon3.addPixmap(
+            QtGui.QPixmap(":/icons/fade"),
+            QtGui.QIcon.Mode.Normal,
+            QtGui.QIcon.State.Off,
+        )
+        self.btnFade.setIcon(icon3)
+        self.btnFade.setIconSize(QtCore.QSize(30, 30))
+        self.btnFade.setObjectName("btnFade")
+        self.verticalLayout_5.addWidget(self.btnFade)
+        self.btnStop = QtWidgets.QPushButton(parent=self.frame)
+        self.btnStop.setMinimumSize(QtCore.QSize(0, 36))
+        icon4 = QtGui.QIcon()
+        icon4.addPixmap(
+            QtGui.QPixmap(":/icons/stopsign"),
+            QtGui.QIcon.Mode.Normal,
+            QtGui.QIcon.State.Off,
+        )
+        self.btnStop.setIcon(icon4)
+        self.btnStop.setObjectName("btnStop")
+        self.verticalLayout_5.addWidget(self.btnStop)
+        self.horizontalLayout.addWidget(self.frame)
+        self.horizontalLayout_2.addWidget(self.InfoFooterFrame)
+
+        self.retranslateUi(FooterSection)
+        QtCore.QMetaObject.connectSlotsByName(FooterSection)
+
+    def retranslateUi(self, FooterSection):
+        _translate = QtCore.QCoreApplication.translate
+        FooterSection.setWindowTitle(_translate("FooterSection", "Form"))
+        self.btnPreview.setText(_translate("FooterSection", "  Preview"))
+        self.btnPreviewStart.setText(_translate("FooterSection", "<<"))
+        self.btnPreviewEnd.setText(_translate("FooterSection", ">>"))
+        self.btnPreviewBack.setText(_translate("FooterSection", "<"))
+        self.btnPreviewFwd.setText(_translate("FooterSection", ">"))
+        self.label_7.setText(_translate("FooterSection", "Intro"))
+        self.label_intro_timer.setText(_translate("FooterSection", "0:0"))
+        self.btnDrop3db.setText(_translate("FooterSection", "-3dB to talk"))
+        self.btnHidePlayed.setText(_translate("FooterSection", "Hide played"))
+        self.label_4.setText(_translate("FooterSection", "Fade"))
+        self.label_fade_timer.setText(_translate("FooterSection", "00:00"))
+        self.label_5.setText(_translate("FooterSection", "Silent"))
+        self.label_silent_timer.setText(_translate("FooterSection", "00:00"))
+        self.btnFade.setText(_translate("FooterSection", "  Fade"))
+        self.btnStop.setText(_translate("FooterSection", "  Stop"))
+
+
+from pyqtgraph import PlotWidget  # type: ignore

app/ui/main_window_header.ui

@@ -0,0 +1,314 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>HeaderSection</class>
+ <widget class="QWidget" name="HeaderSection">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>1273</width>
+    <height>179</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Form</string>
+  </property>
+  <layout class="QHBoxLayout" name="horizontalLayout">
+   <item>
+    <layout class="QGridLayout" name="gridLayout">
+     <item row="0" column="0">
+      <layout class="QHBoxLayout" name="horizontalLayout_3">
+       <item>
+        <layout class="QVBoxLayout" name="verticalLayout_3">
+         <item>
+          <widget class="QLabel" name="previous_track_2">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="maximumSize">
+            <size>
+             <width>230</width>
+             <height>16777215</height>
+            </size>
+           </property>
+           <property name="font">
+            <font>
+             <family>Sans</family>
+             <pointsize>20</pointsize>
+            </font>
+           </property>
+           <property name="styleSheet">
+            <string notr="true">background-color: #f8d7da;
+border: 1px solid rgb(85, 87, 83);</string>
+           </property>
+           <property name="text">
+            <string>Last track:</string>
+           </property>
+           <property name="alignment">
+            <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QLabel" name="current_track_2">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="maximumSize">
+            <size>
+             <width>230</width>
+             <height>16777215</height>
+            </size>
+           </property>
+           <property name="font">
+            <font>
+             <family>Sans</family>
+             <pointsize>20</pointsize>
+            </font>
+           </property>
+           <property name="styleSheet">
+            <string notr="true">background-color: #d4edda;
+border: 1px solid rgb(85, 87, 83);</string>
+           </property>
+           <property name="text">
+            <string>Current track:</string>
+           </property>
+           <property name="alignment">
+            <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QLabel" name="next_track_2">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="maximumSize">
+            <size>
+             <width>230</width>
+             <height>16777215</height>
+            </size>
+           </property>
+           <property name="font">
+            <font>
+             <family>Sans</family>
+             <pointsize>20</pointsize>
+            </font>
+           </property>
+           <property name="styleSheet">
+            <string notr="true">background-color: #fff3cd;
+border: 1px solid rgb(85, 87, 83);</string>
+           </property>
+           <property name="text">
+            <string>Next track:</string>
+           </property>
+           <property name="alignment">
+            <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
+       <item>
+        <layout class="QVBoxLayout" name="verticalLayout">
+         <item>
+          <widget class="QLabel" name="hdrPreviousTrack">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="minimumSize">
+            <size>
+             <width>0</width>
+             <height>0</height>
+            </size>
+           </property>
+           <property name="maximumSize">
+            <size>
+             <width>16777215</width>
+             <height>16777215</height>
+            </size>
+           </property>
+           <property name="font">
+            <font>
+             <family>Sans</family>
+             <pointsize>20</pointsize>
+            </font>
+           </property>
+           <property name="styleSheet">
+            <string notr="true">background-color: #f8d7da;
+border: 1px solid rgb(85, 87, 83);</string>
+           </property>
+           <property name="text">
+            <string/>
+           </property>
+           <property name="wordWrap">
+            <bool>false</bool>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QPushButton" name="hdrCurrentTrack">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="font">
+            <font>
+             <pointsize>20</pointsize>
+            </font>
+           </property>
+           <property name="styleSheet">
+            <string notr="true">background-color: #d4edda;
+border: 1px solid rgb(85, 87, 83);
+text-align: left;
+padding-left: 8px;
+</string>
+           </property>
+           <property name="text">
+            <string/>
+           </property>
+           <property name="flat">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QPushButton" name="hdrNextTrack">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="font">
+            <font>
+             <pointsize>20</pointsize>
+            </font>
+           </property>
+           <property name="styleSheet">
+            <string notr="true">background-color: #fff3cd;
+border: 1px solid rgb(85, 87, 83);
+text-align: left;
+padding-left: 8px;</string>
+           </property>
+           <property name="text">
+            <string/>
+           </property>
+           <property name="flat">
+            <bool>true</bool>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
+       <item>
+        <widget class="QFrame" name="frame_2">
+         <property name="minimumSize">
+          <size>
+           <width>0</width>
+           <height>131</height>
+          </size>
+         </property>
+         <property name="maximumSize">
+          <size>
+           <width>230</width>
+           <height>131</height>
+          </size>
+         </property>
+         <property name="frameShape">
+          <enum>QFrame::StyledPanel</enum>
+         </property>
+         <property name="frameShadow">
+          <enum>QFrame::Raised</enum>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_10">
+          <item>
+           <widget class="QLabel" name="lblTOD">
+            <property name="minimumSize">
+             <size>
+              <width>208</width>
+              <height>0</height>
+             </size>
+            </property>
+            <property name="font">
+             <font>
+              <pointsize>35</pointsize>
+             </font>
+            </property>
+            <property name="text">
+             <string>00:00:00</string>
+            </property>
+            <property name="alignment">
+             <set>Qt::AlignCenter</set>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QLabel" name="label_elapsed_timer">
+            <property name="font">
+             <font>
+              <family>FreeSans</family>
+              <pointsize>18</pointsize>
+              <weight>50</weight>
+              <bold>false</bold>
+             </font>
+            </property>
+            <property name="styleSheet">
+             <string notr="true">color: black;</string>
+            </property>
+            <property name="text">
+             <string>00:00 / 00:00</string>
+            </property>
+            <property name="alignment">
+             <set>Qt::AlignCenter</set>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+      </layout>
+     </item>
+     <item row="1" column="0">
+      <widget class="QFrame" name="frame_4">
+       <property name="minimumSize">
+        <size>
+         <width>0</width>
+         <height>16</height>
+        </size>
+       </property>
+       <property name="autoFillBackground">
+        <bool>false</bool>
+       </property>
+       <property name="styleSheet">
+        <string notr="true">background-color: rgb(154, 153, 150)</string>
+       </property>
+       <property name="frameShape">
+        <enum>QFrame::StyledPanel</enum>
+       </property>
+       <property name="frameShadow">
+        <enum>QFrame::Raised</enum>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

app/ui/main_window_header_ui.py

@@ -0,0 +1,178 @@
+# Form implementation generated from reading ui file 'app/ui/main_window_header.ui'
+#
+# Created by: PyQt6 UI code generator 6.8.1
+#
+# WARNING: Any manual changes made to this file will be lost when pyuic6 is
+# run again.  Do not edit this file unless you know what you are doing.
+
+
+from PyQt6 import QtCore, QtGui, QtWidgets
+
+
+class Ui_HeaderSection(object):
+    def setupUi(self, HeaderSection):
+        HeaderSection.setObjectName("HeaderSection")
+        HeaderSection.resize(1273, 179)
+        self.horizontalLayout = QtWidgets.QHBoxLayout(HeaderSection)
+        self.horizontalLayout.setObjectName("horizontalLayout")
+        self.gridLayout = QtWidgets.QGridLayout()
+        self.gridLayout.setObjectName("gridLayout")
+        self.horizontalLayout_3 = QtWidgets.QHBoxLayout()
+        self.horizontalLayout_3.setObjectName("horizontalLayout_3")
+        self.verticalLayout_3 = QtWidgets.QVBoxLayout()
+        self.verticalLayout_3.setObjectName("verticalLayout_3")
+        self.previous_track_2 = QtWidgets.QLabel(parent=HeaderSection)
+        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Policy.Preferred, QtWidgets.QSizePolicy.Policy.Preferred)
+        sizePolicy.setHorizontalStretch(0)
+        sizePolicy.setVerticalStretch(0)
+        sizePolicy.setHeightForWidth(self.previous_track_2.sizePolicy().hasHeightForWidth())
+        self.previous_track_2.setSizePolicy(sizePolicy)
+        self.previous_track_2.setMaximumSize(QtCore.QSize(230, 16777215))
+        font = QtGui.QFont()
+        font.setFamily("Sans")
+        font.setPointSize(20)
+        self.previous_track_2.setFont(font)
+        self.previous_track_2.setStyleSheet("background-color: #f8d7da;\n"
+"border: 1px solid rgb(85, 87, 83);")
+        self.previous_track_2.setAlignment(QtCore.Qt.AlignmentFlag.AlignRight|QtCore.Qt.AlignmentFlag.AlignTrailing|QtCore.Qt.AlignmentFlag.AlignVCenter)
+        self.previous_track_2.setObjectName("previous_track_2")
+        self.verticalLayout_3.addWidget(self.previous_track_2)
+        self.current_track_2 = QtWidgets.QLabel(parent=HeaderSection)
+        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Policy.Preferred, QtWidgets.QSizePolicy.Policy.Preferred)
+        sizePolicy.setHorizontalStretch(0)
+        sizePolicy.setVerticalStretch(0)
+        sizePolicy.setHeightForWidth(self.current_track_2.sizePolicy().hasHeightForWidth())
+        self.current_track_2.setSizePolicy(sizePolicy)
+        self.current_track_2.setMaximumSize(QtCore.QSize(230, 16777215))
+        font = QtGui.QFont()
+        font.setFamily("Sans")
+        font.setPointSize(20)
+        self.current_track_2.setFont(font)
+        self.current_track_2.setStyleSheet("background-color: #d4edda;\n"
+"border: 1px solid rgb(85, 87, 83);")
+        self.current_track_2.setAlignment(QtCore.Qt.AlignmentFlag.AlignRight|QtCore.Qt.AlignmentFlag.AlignTrailing|QtCore.Qt.AlignmentFlag.AlignVCenter)
+        self.current_track_2.setObjectName("current_track_2")
+        self.verticalLayout_3.addWidget(self.current_track_2)
+        self.next_track_2 = QtWidgets.QLabel(parent=HeaderSection)
+        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Policy.Preferred, QtWidgets.QSizePolicy.Policy.Preferred)
+        sizePolicy.setHorizontalStretch(0)
+        sizePolicy.setVerticalStretch(0)
+        sizePolicy.setHeightForWidth(self.next_track_2.sizePolicy().hasHeightForWidth())
+        self.next_track_2.setSizePolicy(sizePolicy)
+        self.next_track_2.setMaximumSize(QtCore.QSize(230, 16777215))
+        font = QtGui.QFont()
+        font.setFamily("Sans")
+        font.setPointSize(20)
+        self.next_track_2.setFont(font)
+        self.next_track_2.setStyleSheet("background-color: #fff3cd;\n"
+"border: 1px solid rgb(85, 87, 83);")
+        self.next_track_2.setAlignment(QtCore.Qt.AlignmentFlag.AlignRight|QtCore.Qt.AlignmentFlag.AlignTrailing|QtCore.Qt.AlignmentFlag.AlignVCenter)
+        self.next_track_2.setObjectName("next_track_2")
+        self.verticalLayout_3.addWidget(self.next_track_2)
+        self.horizontalLayout_3.addLayout(self.verticalLayout_3)
+        self.verticalLayout = QtWidgets.QVBoxLayout()
+        self.verticalLayout.setObjectName("verticalLayout")
+        self.hdrPreviousTrack = QtWidgets.QLabel(parent=HeaderSection)
+        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Policy.Preferred, QtWidgets.QSizePolicy.Policy.Preferred)
+        sizePolicy.setHorizontalStretch(0)
+        sizePolicy.setVerticalStretch(0)
+        sizePolicy.setHeightForWidth(self.hdrPreviousTrack.sizePolicy().hasHeightForWidth())
+        self.hdrPreviousTrack.setSizePolicy(sizePolicy)
+        self.hdrPreviousTrack.setMinimumSize(QtCore.QSize(0, 0))
+        self.hdrPreviousTrack.setMaximumSize(QtCore.QSize(16777215, 16777215))
+        font = QtGui.QFont()
+        font.setFamily("Sans")
+        font.setPointSize(20)
+        self.hdrPreviousTrack.setFont(font)
+        self.hdrPreviousTrack.setStyleSheet("background-color: #f8d7da;\n"
+"border: 1px solid rgb(85, 87, 83);")
+        self.hdrPreviousTrack.setText("")
+        self.hdrPreviousTrack.setWordWrap(False)
+        self.hdrPreviousTrack.setObjectName("hdrPreviousTrack")
+        self.verticalLayout.addWidget(self.hdrPreviousTrack)
+        self.hdrCurrentTrack = QtWidgets.QPushButton(parent=HeaderSection)
+        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Policy.Preferred, QtWidgets.QSizePolicy.Policy.Preferred)
+        sizePolicy.setHorizontalStretch(0)
+        sizePolicy.setVerticalStretch(0)
+        sizePolicy.setHeightForWidth(self.hdrCurrentTrack.sizePolicy().hasHeightForWidth())
+        self.hdrCurrentTrack.setSizePolicy(sizePolicy)
+        font = QtGui.QFont()
+        font.setPointSize(20)
+        self.hdrCurrentTrack.setFont(font)
+        self.hdrCurrentTrack.setStyleSheet("background-color: #d4edda;\n"
+"border: 1px solid rgb(85, 87, 83);\n"
+"text-align: left;\n"
+"padding-left: 8px;\n"
+"")
+        self.hdrCurrentTrack.setText("")
+        self.hdrCurrentTrack.setFlat(True)
+        self.hdrCurrentTrack.setObjectName("hdrCurrentTrack")
+        self.verticalLayout.addWidget(self.hdrCurrentTrack)
+        self.hdrNextTrack = QtWidgets.QPushButton(parent=HeaderSection)
+        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Policy.Preferred, QtWidgets.QSizePolicy.Policy.Preferred)
+        sizePolicy.setHorizontalStretch(0)
+        sizePolicy.setVerticalStretch(0)
+        sizePolicy.setHeightForWidth(self.hdrNextTrack.sizePolicy().hasHeightForWidth())
+        self.hdrNextTrack.setSizePolicy(sizePolicy)
+        font = QtGui.QFont()
+        font.setPointSize(20)
+        self.hdrNextTrack.setFont(font)
+        self.hdrNextTrack.setStyleSheet("background-color: #fff3cd;\n"
+"border: 1px solid rgb(85, 87, 83);\n"
+"text-align: left;\n"
+"padding-left: 8px;")
+        self.hdrNextTrack.setText("")
+        self.hdrNextTrack.setFlat(True)
+        self.hdrNextTrack.setObjectName("hdrNextTrack")
+        self.verticalLayout.addWidget(self.hdrNextTrack)
+        self.horizontalLayout_3.addLayout(self.verticalLayout)
+        self.frame_2 = QtWidgets.QFrame(parent=HeaderSection)
+        self.frame_2.setMinimumSize(QtCore.QSize(0, 131))
+        self.frame_2.setMaximumSize(QtCore.QSize(230, 131))
+        self.frame_2.setFrameShape(QtWidgets.QFrame.Shape.StyledPanel)
+        self.frame_2.setFrameShadow(QtWidgets.QFrame.Shadow.Raised)
+        self.frame_2.setObjectName("frame_2")
+        self.verticalLayout_10 = QtWidgets.QVBoxLayout(self.frame_2)
+        self.verticalLayout_10.setObjectName("verticalLayout_10")
+        self.lblTOD = QtWidgets.QLabel(parent=self.frame_2)
+        self.lblTOD.setMinimumSize(QtCore.QSize(208, 0))
+        font = QtGui.QFont()
+        font.setPointSize(35)
+        self.lblTOD.setFont(font)
+        self.lblTOD.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
+        self.lblTOD.setObjectName("lblTOD")
+        self.verticalLayout_10.addWidget(self.lblTOD)
+        self.label_elapsed_timer = QtWidgets.QLabel(parent=self.frame_2)
+        font = QtGui.QFont()
+        font.setFamily("FreeSans")
+        font.setPointSize(18)
+        font.setBold(False)
+        font.setWeight(50)
+        self.label_elapsed_timer.setFont(font)
+        self.label_elapsed_timer.setStyleSheet("color: black;")
+        self.label_elapsed_timer.setAlignment(QtCore.Qt.AlignmentFlag.AlignCenter)
+        self.label_elapsed_timer.setObjectName("label_elapsed_timer")
+        self.verticalLayout_10.addWidget(self.label_elapsed_timer)
+        self.horizontalLayout_3.addWidget(self.frame_2)
+        self.gridLayout.addLayout(self.horizontalLayout_3, 0, 0, 1, 1)
+        self.frame_4 = QtWidgets.QFrame(parent=HeaderSection)
+        self.frame_4.setMinimumSize(QtCore.QSize(0, 16))
+        self.frame_4.setAutoFillBackground(False)
+        self.frame_4.setStyleSheet("background-color: rgb(154, 153, 150)")
+        self.frame_4.setFrameShape(QtWidgets.QFrame.Shape.StyledPanel)
+        self.frame_4.setFrameShadow(QtWidgets.QFrame.Shadow.Raised)
+        self.frame_4.setObjectName("frame_4")
+        self.gridLayout.addWidget(self.frame_4, 1, 0, 1, 1)
+        self.horizontalLayout.addLayout(self.gridLayout)
+
+        self.retranslateUi(HeaderSection)
+        QtCore.QMetaObject.connectSlotsByName(HeaderSection)
+
+    def retranslateUi(self, HeaderSection):
+        _translate = QtCore.QCoreApplication.translate
+        HeaderSection.setWindowTitle(_translate("HeaderSection", "Form"))
+        self.previous_track_2.setText(_translate("HeaderSection", "Last track:"))
+        self.current_track_2.setText(_translate("HeaderSection", "Current track:"))
+        self.next_track_2.setText(_translate("HeaderSection", "Next track:"))
+        self.lblTOD.setText(_translate("HeaderSection", "00:00:00"))
+        self.label_elapsed_timer.setText(_translate("HeaderSection", "00:00 / 00:00"))

app/ui/main_window_playlist.ui

@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>PlaylistSection</class>
+ <widget class="QWidget" name="PlaylistSection">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>1249</width>
+    <height>538</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Form</string>
+  </property>
+  <layout class="QHBoxLayout" name="horizontalLayout">
+   <item>
+    <widget class="QSplitter" name="splitter">
+     <property name="orientation">
+      <enum>Qt::Vertical</enum>
+     </property>
+     <widget class="QTabWidget" name="tabPlaylist">
+      <property name="currentIndex">
+       <number>-1</number>
+      </property>
+      <property name="documentMode">
+       <bool>false</bool>
+      </property>
+      <property name="tabsClosable">
+       <bool>true</bool>
+      </property>
+      <property name="movable">
+       <bool>true</bool>
+      </property>
+     </widget>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

app/ui/main_window_playlist_ui.py

@@ -0,0 +1,34 @@
+# Form implementation generated from reading ui file 'app/ui/main_window_playlist.ui'
+#
+# Created by: PyQt6 UI code generator 6.8.1
+#
+# WARNING: Any manual changes made to this file will be lost when pyuic6 is
+# run again.  Do not edit this file unless you know what you are doing.
+
+
+from PyQt6 import QtCore, QtGui, QtWidgets
+
+
+class Ui_PlaylistSection(object):
+    def setupUi(self, PlaylistSection):
+        PlaylistSection.setObjectName("PlaylistSection")
+        PlaylistSection.resize(1249, 499)
+        self.horizontalLayout = QtWidgets.QHBoxLayout(PlaylistSection)
+        self.horizontalLayout.setObjectName("horizontalLayout")
+        self.splitter = QtWidgets.QSplitter(parent=PlaylistSection)
+        self.splitter.setOrientation(QtCore.Qt.Orientation.Vertical)
+        self.splitter.setObjectName("splitter")
+        self.tabPlaylist = QtWidgets.QTabWidget(parent=self.splitter)
+        self.tabPlaylist.setDocumentMode(False)
+        self.tabPlaylist.setTabsClosable(True)
+        self.tabPlaylist.setMovable(True)
+        self.tabPlaylist.setObjectName("tabPlaylist")
+        self.horizontalLayout.addWidget(self.splitter)
+
+        self.retranslateUi(PlaylistSection)
+        self.tabPlaylist.setCurrentIndex(-1)
+        QtCore.QMetaObject.connectSlotsByName(PlaylistSection)
+
+    def retranslateUi(self, PlaylistSection):
+        _translate = QtCore.QCoreApplication.translate
+        PlaylistSection.setWindowTitle(_translate("PlaylistSection", "Form"))

app/utilities.py

@@ -0,0 +1,97 @@
+#!/usr/bin/env python
+# Standard library imports
+import os
+
+# PyQt imports
+
+# Third party imports
+from sqlalchemy.orm.session import Session
+
+# App imports
+from config import Config
+from helpers import (
+    get_tags,
+)
+from log import log
+from models import Tracks
+
+
+def check_db(session: Session) -> None:
+    """
+    Database consistency check.
+
+    A report is generated if issues are found, but there are no automatic
+    corrections made.
+
+    Search for tracks that are in the music directory but not the datebase
+    Check all paths in database exist
+    """
+
+    db_paths = set([a.path for a in Tracks.get_all(session)])
+
+    os_paths_list = []
+    for root, _dirs, files in os.walk(Config.ROOT):
+        for f in files:
+            path = os.path.join(root, f)
+            ext = os.path.splitext(f)[1]
+            if ext in [".flac", ".mp3"]:
+                os_paths_list.append(path)
+    os_paths = set(os_paths_list)
+
+    # Find any files in music directory that are not in database
+    files_not_in_db = list(os_paths - db_paths)
+
+    # Find paths in database missing in music directory
+    paths_not_found = []
+    missing_file_count = 0
+    more_files_to_report = False
+    for path in list(db_paths - os_paths):
+        if missing_file_count >= Config.MAX_MISSING_FILES_TO_REPORT:
+            more_files_to_report = True
+            break
+
+        missing_file_count += 1
+
+        track = Tracks.get_by_path(session, path)
+        if not track:
+            # This shouldn't happen as we're looking for paths in
+            # database that aren't in filesystem, but just in case...
+            log.error(f"update_db: {path} not found in db")
+            continue
+
+        paths_not_found.append(track)
+
+    # Output messages (so if running via cron, these will get sent to
+    # user)
+    if files_not_in_db:
+        print("Files in music directory but not in database")
+        print("--------------------------------------------")
+        print("\n".join(files_not_in_db))
+        print("\n")
+    if paths_not_found:
+        print("Invalid paths in database")
+        print("-------------------------")
+        for t in paths_not_found:
+            print(
+                f"""
+                Track ID: {t.id}
+                Path:     {t.path}
+                Title:    {t.title}
+                Artist:   {t.artist}
+            """
+            )
+        if more_files_to_report:
+            print("There were more paths than listed that were not found")
+
+
+def update_bitrates(session: Session) -> None:
+    """
+    Update bitrates on all tracks in database
+    """
+
+    for track in Tracks.get_all(session):
+        try:
+            t = get_tags(track.path)
+            track.bitrate = t.bitrate
+        except FileNotFoundError:
+            continue

app/vlcmanager.py

@@ -0,0 +1,29 @@
+# Standard library imports
+
+# PyQt imports
+
+# Third party imports
+import vlc  # type: ignore
+
+# App imports
+
+
+class VLCManager:
+    """
+    Singleton class to ensure we only ever have one vlc Instance
+    """
+
+    __instance = None
+
+    def __init__(self) -> None:
+        if VLCManager.__instance is None:
+            self.vlc_instance = vlc.Instance()
+            VLCManager.__instance = self
+        else:
+            raise Exception("Attempted to create a second VLCManager instance")
+
+    @staticmethod
+    def get_instance() -> vlc.Instance:
+        if VLCManager.__instance is None:
+            VLCManager()
+        return VLCManager.__instance

archive/DragAndDropReference.py

@@ -0,0 +1,190 @@
+#!/usr/bin/python3
+# vim: set expandtab tabstop=4 shiftwidth=4:
+
+# PyQt Functionality Snippet by Apocalyptech
+# "Licensed" in the Public Domain under CC0 1.0 Universal (CC0 1.0)
+# Public Domain Dedication.  Use it however you like!
+#
+# https://creativecommons.org/publicdomain/zero/1.0/
+# https://creativecommons.org/publicdomain/zero/1.0/legalcode
+
+from PyQt6 import QtWidgets, QtCore
+
+
+# class MyModel(QtGui.QStandardItemModel):
+class MyModel(QtCore.QAbstractTableModel):
+    def __init__(self, parent=None):
+        super().__init__(parent)
+
+    def columnCount(self, parent=None):
+        return 5
+
+    def rowCount(self, parent=None):
+        return 20
+
+    # def headerData(self, column: int, orientation, role: QtCore.Qt.ItemDataRole):
+    #     return (('Regex', 'Category')[column]
+    #             if role == QtCore.Qt.DisplayRole and orientation == QtCore.Qt.Horizontal
+    #             else None)
+
+    def headerData(self, column, orientation, role):
+        if role == QtCore.Qt.ItemDataRole.DisplayRole and orientation == QtCore.Qt.Orientation.Horizontal:
+            return f"{column=}"
+        return None
+
+    def data(self, index: QtCore.QModelIndex, role: QtCore.Qt.ItemDataRole):
+        if not index.isValid() or role not in {
+            QtCore.Qt.ItemDataRole.DisplayRole,
+            QtCore.Qt.ItemDataRole.EditRole,
+        }:
+            return None
+        # return (self._data[index.row()][index.column()] if index.row() < len(self._data) else
+        #         "edit me" if role == QtCore.Qt.DisplayRole else "")
+
+        # def data(self, index, role):
+        #     if not index.isValid() or role not in [QtCore.Qt.DisplayRole,
+        #                                            QtCore.Qt.EditRole]:
+        #         return None
+        #     return (self._data[index.row()][index.column()] if index.row() < len(self._data) else
+        #             "edit me" if role == QtCore.Qt.DisplayRole else "")
+
+        row = index.row()
+        column = index.column()
+        return f"Row {row}, Col {column}"
+
+    def flags(self, index: QtCore.QModelIndex) -> QtCore.Qt.ItemFlag:
+        # https://doc.qt.io/qt-5/qt.html#ItemFlag-enum
+        if not index.isValid():
+            return QtCore.Qt.ItemFlag.ItemIsEnabled
+        if index.row() < 20:
+            return (
+                QtCore.Qt.ItemFlag.ItemIsEnabled
+                | QtCore.Qt.ItemFlag.ItemIsEditable
+                | QtCore.Qt.ItemFlag.ItemIsSelectable
+                | QtCore.Qt.ItemFlag.ItemIsDragEnabled
+            )
+        return QtCore.Qt.ItemFlag.ItemIsEnabled | QtCore.Qt.ItemFlag.ItemIsEditable
+
+    # def flags(self, index):
+    #     if not index.isValid():
+    #         return QtCore.Qt.ItemIsDropEnabled
+    #     if index.row() < 5:
+    #         return (
+    #             QtCore.Qt.ItemIsEnabled
+    #             | QtCore.Qt.ItemIsEditable
+    #             | QtCore.Qt.ItemIsSelectable
+    #             | QtCore.Qt.ItemIsDragEnabled
+    #         )
+    #     return QtCore.Qt.ItemIsEnabled | QtCore.Qt.ItemIsEditable
+
+    # def supportedDragOptions(self):
+    #     return QtCore.Qt.MoveAction | QtCore.Qt.CopyAction
+
+    # def supportedDropActions(self) -> bool:
+    #     return QtCore.Qt.MoveAction | QtCore.Qt.CopyAction
+
+    def relocateRow(self, row_source, row_target) -> None:
+        return
+        row_a, row_b = max(row_source, row_target), min(row_source, row_target)
+        self.beginMoveRows(
+            QtCore.QModelIndex(), row_a, row_a, QtCore.QModelIndex(), row_b
+        )
+        self._data.insert(row_target, self._data.pop(row_source))
+        self.endMoveRows()
+
+    def supportedDropActions(self):
+        return QtCore.Qt.DropAction.MoveAction | QtCore.Qt.DropAction.CopyAction
+
+    # def relocateRow(self, src, dst):
+    #     print("relocateRow")
+
+    # def dropMimeData(self, data, action, row, col, parent):
+    #     """
+    #     Always move the entire row, and don't allow column "shifting"
+    #     """
+    #     # return super().dropMimeData(data, action, row, 0, parent)
+    #     print("dropMimeData")
+    #     super().dropMimeData(data, action, row, col, parent)
+
+
+class MyStyle(QtWidgets.QProxyStyle):
+    def drawPrimitive(self, element, option, painter, widget=None):
+        """
+        Draw a line across the entire row rather than just the column
+        we're hovering over.  This may not always work depending on global
+        style - for instance I think it won't work on OSX.
+        """
+        if element == QtWidgets.QStyle.PrimitiveElement.PE_IndicatorItemViewItemDrop and not option.rect.isNull():
+            option_new = QtWidgets.QStyleOption(option)
+            option_new.rect.setLeft(0)
+            if widget:
+                option_new.rect.setRight(widget.width())
+            option = option_new
+        super().drawPrimitive(element, option, painter, widget)
+
+
+class MyTableView(QtWidgets.QTableView):
+    def __init__(self, parent):
+        super().__init__(parent)
+        self.verticalHeader().hide()
+        self.setSelectionBehavior(QtWidgets.QAbstractItemView.SelectionBehavior.SelectRows)
+        self.setSelectionMode(QtWidgets.QAbstractItemView.SelectionMode.ExtendedSelection)
+        self.setDragDropMode(QtWidgets.QAbstractItemView.DragDropMode.InternalMove)
+        self.setDragDropOverwriteMode(False)
+        self.setAcceptDrops(True)
+        # self.horizontalHeader().hide()
+        # self.horizontalHeader().setSectionResizeMode(QtWidgets.QHeaderView.Stretch)
+        # self.setShowGrid(False)
+
+        # Set our custom style - this draws the drop indicator across the whole row
+        self.setStyle(MyStyle())
+
+        # Set our custom model - this prevents row "shifting"
+        # self.model = MyModel()
+        # self.setModel(self.model)
+        self.setModel(MyModel())
+
+        # for (idx, data) in enumerate(['foo', 'bar', 'baz']):
+        #     item_1 = QtGui.QStandardItem('Item {}'.format(idx))
+        #     item_1.setEditable(False)
+        #     item_1.setDropEnabled(False)
+
+        #     item_2 = QtGui.QStandardItem(data)
+        #     item_2.setEditable(False)
+        #     item_2.setDropEnabled(False)
+
+        #     self.model.appendRow([item_1, item_2])
+
+    def dropEvent(self, event):
+        if event.source() is not self or (
+            event.dropAction() != QtCore.Qt.DropAction.MoveAction
+            and self.dragDropMode() != QtWidgets.QAbstractItemView.InternalMove
+        ):
+            super().dropEvent(event)
+
+        from_rows = list(set([a.row() for a in self.selectedIndexes()]))
+        to_row = self.indexAt(event.position().toPoint()).row()
+        if (
+            0 <= min(from_rows) <= self.model().rowCount()
+            and 0 <= max(from_rows) <= self.model().rowCount()
+            and 0 <= to_row <= self.model().rowCount()
+        ):
+            print(f"move_rows({from_rows=}, {to_row=})")
+            event.accept()
+        super().dropEvent(event)
+
+
+class Testing(QtWidgets.QMainWindow):
+    def __init__(self):
+        super().__init__()
+
+        view = MyTableView(self)
+        view.setModel(MyModel())
+        self.setCentralWidget(view)
+        self.show()
+
+
+if __name__ == "__main__":
+    app = QtWidgets.QApplication([])
+    test = Testing()
+    raise SystemExit(app.exec())

archive/audplayer.py

@@ -1,11 +1,11 @@
 #!/usr/bin/python3
 
-from datetime import datetime, timedelta
+import datetime as dt
 from threading import Timer
 from pydub import AudioSegment
 from time import sleep
-from timeloop import Timeloop
-import vlc
+from timeloop import Timeloop  # type: ignore
+import vlc  # type: ignore
 
 
 class RepeatedTimer(object):
@@ -49,9 +49,9 @@ def leading_silence(audio_segment, silence_threshold=-50.0, chunk_size=10):
 
     trim_ms = 0  # ms
     assert chunk_size > 0  # to avoid infinite loop
-    while (
-        audio_segment[trim_ms:trim_ms + chunk_size].dBFS < silence_threshold
-            and trim_ms < len(audio_segment)):
+    while audio_segment[
+        trim_ms : trim_ms + chunk_size
+    ].dBFS < silence_threshold and trim_ms < len(audio_segment):
         trim_ms += chunk_size
 
     # if there is no end it should return the length of the segment
@@ -72,8 +72,9 @@ def significant_fade(audio_segment, fade_threshold=-20.0, chunk_size=10):
     segment_length = audio_segment.duration_seconds * 1000  # ms
     trim_ms = segment_length - chunk_size
     while (
-        audio_segment[trim_ms:trim_ms + chunk_size].dBFS < fade_threshold
-            and trim_ms > 0):
+        audio_segment[trim_ms : trim_ms + chunk_size].dBFS < fade_threshold
+        and trim_ms > 0
+    ):
         trim_ms -= chunk_size
 
     # if there is no trailing silence, return lenght of track (it's less
@@ -94,8 +95,9 @@ def trailing_silence(audio_segment, silence_threshold=-50.0, chunk_size=10):
     segment_length = audio_segment.duration_seconds * 1000  # ms
     trim_ms = segment_length - chunk_size
     while (
-        audio_segment[trim_ms:trim_ms + chunk_size].dBFS < silence_threshold
-            and trim_ms > 0):
+        audio_segment[trim_ms : trim_ms + chunk_size].dBFS < silence_threshold
+        and trim_ms > 0
+    ):
         trim_ms -= chunk_size
 
     # if there is no trailing silence, return lenght of track (it's less
@@ -124,15 +126,17 @@ def update_progress(player, talk_at, silent_at):
     remaining_time = total_time - elapsed_time
     talk_time = remaining_time - (total_time - talk_at)
     silent_time = remaining_time - (total_time - silent_at)
-    end_time = (datetime.now() + timedelta(
-        milliseconds=remaining_time)).strftime("%H:%M:%S")
+    end_time = (dt.datetime.now() + timedelta(milliseconds=remaining_time)).strftime(
+        "%H:%M:%S"
+    )
     print(
         f"\t{ms_to_mmss(elapsed_time)}/"
         f"{ms_to_mmss(total_time)}\t\t"
         f"Talk in: {ms_to_mmss(talk_time)} "
         f"Silent in: {ms_to_mmss(silent_time)} "
-        f"Ends at: {end_time} [{ms_to_mmss(remaining_time)}]"
-        , end="\r")
+        f"Ends at: {end_time} [{ms_to_mmss(remaining_time)}]",
+        end="\r",
+    )
 
 
 # Print name of current song, print name of next song. Play current when
@@ -163,21 +167,21 @@ def test():
 
 test()
 # next_song = get_next_song
-# 
+#
 # def play_track():
 #     r = run_aud_cmd("--current-song-length
-# 
-# 
-# 
+#
+#
+#
 # def play():
 #     play_track()
 #     songtimer_start()
-# 
-# 
+#
+#
 # print("Start playing in 3 seconds")
-# 
+#
 # sleep(3)
-# 
+#
 # play()
 
 

archive/db_experiments.py

@@ -0,0 +1,84 @@
+#!/usr/bin/env python3
+
+from sqlalchemy import create_engine, String, update, bindparam, case
+from sqlalchemy.orm import (
+    DeclarativeBase,
+    Mapped,
+    mapped_column,
+    sessionmaker,
+    scoped_session,
+)
+from typing import Generator
+from contextlib import contextmanager
+
+db_url = "sqlite:////tmp/rhys.db"
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+class Rhys(Base):
+    __tablename__ = "rhys"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    ref_number: Mapped[int] = mapped_column()
+    name: Mapped[str] = mapped_column(String(256), index=True)
+
+    def __init__(self, session, ref_number: int, name: str) -> None:
+        self.ref_number = ref_number
+        self.name = name
+        session.add(self)
+        session.flush()
+
+
+@contextmanager
+def Session() -> Generator[scoped_session, None, None]:
+    Session = scoped_session(sessionmaker(bind=engine))
+    yield Session
+    Session.commit()
+    Session.close()
+
+
+engine = create_engine(db_url)
+Base.metadata.create_all(engine)
+
+inital_number_of_records = 10
+
+
+def move_rows(session):
+    new_row = 6
+
+    with Session() as session:
+        # new_record = Rhys(session, new_row, f"new {new_row=}")
+        # Move rows
+
+        stmt = (
+            update(Rhys)
+            .where(Rhys.ref_number > new_row)
+            # .where(Rhys.id.in_(session.query(Rhys.id).order_by(Rhys.id.desc())))
+            .values({Rhys.ref_number: Rhys.ref_number + 1})
+        )
+
+        session.execute(stmt)
+
+
+sqla_map = []
+for k, v in zip(range(11), [0, 1, 2, 3, 4, 7, 8, 10, 5, 6, 9]):
+    sqla_map.append({"oldrow": k, "newrow": v})
+
+# for a, b in sqla_map.items():
+#     print(f"{a} > {b}")
+
+with Session() as session:
+    for a in range(inital_number_of_records):
+        _ = Rhys(session, a, f"record: {a}")
+
+    stmt = update(Rhys).values(
+        ref_number=case(
+            {item['oldrow']: item['newrow'] for item in sqla_map},
+            value=Rhys.ref_number
+        )
+    )
+
+    session.connection().execute(stmt, sqla_map)

archive/dragdrop.py

@@ -0,0 +1,101 @@
+#!/usr/bin/env python3
+
+# https://stackoverflow.com/questions/26227885/drag-and-drop-rows-within-qtablewidget
+
+import sys
+
+from PyQt6.QtWidgets import (
+    QTableWidget,
+    QAbstractItemView,
+    QTableWidgetItem,
+    QWidget,
+    QHBoxLayout,
+    QApplication,
+)
+from PyQt6.QtCore import Qt
+
+
+class TableWidgetDragRows(QTableWidget):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        self.setDragEnabled(True)
+        self.setAcceptDrops(True)
+        self.viewport().setAcceptDrops(True)
+        self.setDragDropOverwriteMode(False)
+        self.setDropIndicatorShown(True)
+
+        self.setSelectionMode(QAbstractItemView.SelectionMode.ExtendedSelection)
+        self.setSelectionBehavior(QAbstractItemView.SelectionBehavior.SelectRows)
+        self.setDragDropMode(QAbstractItemView.DragDropMode.InternalMove)
+        self.DropIndicatorPosition(QAbstractItemView.DropIndicatorPosition.BelowItem)
+
+    def dropEvent(self, event):
+        if event.source() == self:
+            rows = set([mi.row() for mi in self.selectedIndexes()])
+            targetRow = self.indexAt(event.position().toPoint()).row()
+            if self.dropIndicatorPosition() == QAbstractItemView.DropIndicatorPosition.BelowItem:
+                targetRow += 1
+            rows.discard(targetRow)
+            rows = sorted(rows)
+            if not rows:
+                return
+            if targetRow == -1:
+                targetRow = self.rowCount()
+            for _ in range(len(rows)):
+                self.insertRow(targetRow)
+            rowMapping = dict()  # Src row to target row.
+            for idx, row in enumerate(rows):
+                if row < targetRow:
+                    rowMapping[row] = targetRow + idx
+                else:
+                    rowMapping[row + len(rows)] = targetRow + idx
+            colCount = self.columnCount()
+            for srcRow, tgtRow in sorted(rowMapping.items()):
+                for col in range(0, colCount):
+                    self.setItem(tgtRow, col, self.takeItem(srcRow, col))
+            for row in reversed(sorted(rowMapping.keys())):
+                self.removeRow(row)
+            event.accept()
+            return
+
+
+class Window(QWidget):
+    def __init__(self):
+        super(Window, self).__init__()
+
+        layout = QHBoxLayout()
+        self.setLayout(layout)
+
+        self.table_widget = TableWidgetDragRows()
+        layout.addWidget(self.table_widget)
+
+        # setup table widget
+        self.table_widget.setColumnCount(2)
+        self.table_widget.setHorizontalHeaderLabels(["Type", "Name"])
+
+        items = [
+            ("Red", "Toyota"),
+            ("Blue", "RV"),
+            ("Green", "Beetle"),
+            ("Silver", "Chevy"),
+            ("Black", "BMW"),
+        ]
+        self.table_widget.setRowCount(len(items))
+        for i, (color, model) in enumerate(items):
+            item_flags = Qt.ItemFlag.ItemIsSelectable | Qt.ItemFlag.ItemIsDragEnabled
+            colour_item = QTableWidgetItem(color)
+            colour_item.setFlags(item_flags)
+            model_item = QTableWidgetItem(model)
+            model_item.setFlags(item_flags)
+            self.table_widget.setItem(i, 0, QTableWidgetItem(color))
+            self.table_widget.setItem(i, 1, QTableWidgetItem(model))
+
+        self.resize(400, 400)
+        self.show()
+
+
+if __name__ == "__main__":
+    app = QApplication(sys.argv)
+    window = Window()
+    sys.exit(app.exec())

archive/play.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python
+
+from pydub import AudioSegment
+
+
+def fade_point(audio_segment, fade_threshold=-12, chunk_size=10):
+    """
+    Returns the millisecond/index of the point where the fade is down to
+    fade_threshold and doesn't get louder again.
+    audio_segment - the sdlg_search_database_uiegment to find silence in
+    fade_threshold - the upper bound for how quiet is silent in dFBS
+    chunk_size - chunk size for interating over the segment in ms
+    """
+
+    assert chunk_size > 0  # to avoid infinite loop
+
+    segment_length = audio_segment.duration_seconds * 1000  # ms
+    print(f"segment_length={int(segment_length/1000)}")
+    trim_ms = segment_length - chunk_size
+
+    max_vol = audio_segment.dBFS
+    print(f"{max_vol=}")
+    fade_threshold = max_vol
+    while (
+        audio_segment[trim_ms : trim_ms + chunk_size].dBFS < fade_threshold
+        and trim_ms > 0
+    ):  # noqa W503
+        trim_ms -= chunk_size
+
+    # if there is no trailing silence, return lenght of track (it's less
+    # the chunk_size, but for chunk_size = 10ms, this may be ignored)
+    print(f"Fade last {int(segment_length - trim_ms)/1000} seconds")
+
+
+# print("Shout:")
+# segment = AudioSegment.from_mp3("../archive/shout.mp3")
+# fade_point(segment)
+# print("Champagne:")
+# segment = AudioSegment.from_mp3("../archive/champ.mp3")
+# fade_point(segment)
+# print("Be good:")
+# segment = AudioSegment.from_mp3("../archive/wibg.mp3")
+# fade_point(segment)
+print("Be good:")
+segment = AudioSegment.from_file("/tmp/bia.flac", "flac")
+fade_point(segment)

archive/proxymodel.py

@@ -0,0 +1,125 @@
+#!/usr/bin/env python
+
+import sys
+from PyQt6.QtCore import (Qt, QAbstractTableModel, QModelIndex, QSortFilterProxyModel)
+from PyQt6.QtWidgets import (QApplication, QMainWindow, QTableView, QLineEdit, QVBoxLayout, QWidget)
+
+class CustomTableModel(QAbstractTableModel):
+    def __init__(self, data):
+        super().__init__()
+        self._data = data
+
+    def rowCount(self, parent=QModelIndex()):
+        return len(self._data)
+
+    def columnCount(self, parent=QModelIndex()):
+        return 2  # Row number and data
+
+    def data(self, index, role=Qt.ItemDataRole.DisplayRole):
+        if role == Qt.ItemDataRole.DisplayRole:
+            row, col = index.row(), index.column()
+            if col == 0:
+                return row + 1  # Row number (1-based index)
+            elif col == 1:
+                return self._data[row]
+
+    def setData(self, index, value, role=Qt.ItemDataRole.EditRole):
+        if role == Qt.ItemDataRole.EditRole and index.isValid():
+            self._data[index.row()] = value
+            self.dataChanged.emit(index, index, [Qt.ItemDataRole.EditRole])
+            return True
+        return False
+
+    def flags(self, index):
+        default_flags = Qt.ItemFlag.ItemIsSelectable | Qt.ItemFlag.ItemIsEnabled
+        if index.isValid():
+            return default_flags | Qt.ItemFlag.ItemIsDragEnabled | Qt.ItemFlag.ItemIsDropEnabled
+        return default_flags | Qt.ItemFlag.ItemIsDropEnabled
+
+    def removeRow(self, row):
+        self.beginRemoveRows(QModelIndex(), row, row)
+        self._data.pop(row)
+        self.endRemoveRows()
+
+    def insertRow(self, row, value):
+        self.beginInsertRows(QModelIndex(), row, row)
+        self._data.insert(row, value)
+        self.endInsertRows()
+
+    def moveRows(self, sourceParent, sourceRow, count, destinationParent, destinationRow):
+        if sourceRow < destinationRow:
+            destinationRow -= 1
+
+        self.beginMoveRows(sourceParent, sourceRow, sourceRow, destinationParent, destinationRow)
+        row_data = self._data.pop(sourceRow)
+        self._data.insert(destinationRow, row_data)
+        self.endMoveRows()
+        return True
+
+class ProxyModel(QSortFilterProxyModel):
+    def __init__(self):
+        super().__init__()
+        self.filterString = ""
+
+    def setFilterString(self, text):
+        self.filterString = text
+        self.invalidateFilter()
+
+    def filterAcceptsRow(self, source_row, source_parent):
+        if self.filterString:
+            data = self.sourceModel().data(self.sourceModel().index(source_row, 1), Qt.ItemDataRole.DisplayRole)
+            return self.filterString in str(data)
+        return True
+
+class TableView(QTableView):
+    def __init__(self, model):
+        super().__init__()
+        self.setModel(model)
+        self.setDragDropMode(QTableView.DragDropMode.InternalMove)
+        self.setSelectionBehavior(QTableView.SelectionBehavior.SelectRows)
+        self.setSortingEnabled(False)
+        self.setDragDropOverwriteMode(False)
+
+    def dropEvent(self, event):
+        source_index = self.indexAt(event.pos())
+        if not source_index.isValid():
+            return
+
+        destination_row = source_index.row()
+        dragged_row = self.currentIndex().row()
+
+        if dragged_row != destination_row:
+            self.model().sourceModel().moveRows(QModelIndex(), dragged_row, 1, QModelIndex(), destination_row)
+        super().dropEvent(event)
+        self.model().layoutChanged.emit()  # Refresh model to update row numbers
+
+class MainWindow(QMainWindow):
+    def __init__(self):
+        super().__init__()
+
+        self.data = ["dog", "hog", "don", "cat", "bat"]
+
+        self.baseModel = CustomTableModel(self.data)
+        self.proxyModel = ProxyModel()
+        self.proxyModel.setSourceModel(self.baseModel)
+
+        self.view = TableView(self.proxyModel)
+
+        self.filterLineEdit = QLineEdit()
+        self.filterLineEdit.setPlaceholderText("Filter by substring")
+        self.filterLineEdit.textChanged.connect(self.proxyModel.setFilterString)
+
+        layout = QVBoxLayout()
+        layout.addWidget(self.filterLineEdit)
+        layout.addWidget(self.view)
+
+        container = QWidget()
+        container.setLayout(layout)
+        self.setCentralWidget(container)
+
+if __name__ == "__main__":
+    app = QApplication(sys.argv)
+    window = MainWindow()
+    window.show()
+    sys.exit(app.exec())
+

archive/qtableview-reorder-working.py

@@ -0,0 +1,98 @@
+#!/usr/bin/env python
+# vim: set expandtab tabstop=4 shiftwidth=4:
+
+# PyQt Functionality Snippet by Apocalyptech
+# "Licensed" in the Public Domain under CC0 1.0 Universal (CC0 1.0)
+# Public Domain Dedication.  Use it however you like!
+#
+# https://creativecommons.org/publicdomain/zero/1.0/
+# https://creativecommons.org/publicdomain/zero/1.0/legalcode
+
+import sys
+from PyQt5 import QtWidgets, QtGui, QtCore
+
+class MyModel(QtGui.QStandardItemModel):
+
+    def dropMimeData(self, data, action, row, col, parent):
+        """
+        Always move the entire row, and don't allow column "shifting"
+        """
+        return super().dropMimeData(data, action, row, 0, parent)
+
+class MyStyle(QtWidgets.QProxyStyle):
+
+    def drawPrimitive(self, element, option, painter, widget=None):
+        """
+        Draw a line across the entire row rather than just the column
+        we're hovering over.  This may not always work depending on global
+        style - for instance I think it won't work on OSX.
+        """
+        if element == self.PE_IndicatorItemViewItemDrop and not option.rect.isNull():
+            option_new = QtWidgets.QStyleOption(option)
+            option_new.rect.setLeft(0)
+            if widget:
+                option_new.rect.setRight(widget.width())
+            option = option_new
+        super().drawPrimitive(element, option, painter, widget)
+
+class MyTableView(QtWidgets.QTableView):
+
+    def __init__(self, parent):
+        super().__init__(parent)
+        self.verticalHeader().hide()
+        self.horizontalHeader().hide()
+        self.horizontalHeader().setSectionResizeMode(QtWidgets.QHeaderView.Stretch)
+        self.setSelectionBehavior(self.SelectRows)
+        self.setSelectionMode(self.SingleSelection)
+        self.setShowGrid(False)
+        self.setDragDropMode(self.InternalMove)
+        self.setDragDropOverwriteMode(False)
+
+        # Set our custom style - this draws the drop indicator across the whole row
+        self.setStyle(MyStyle())
+
+        # Set our custom model - this prevents row "shifting"
+        self.model = MyModel()
+        self.setModel(self.model)
+
+        for (idx, data) in enumerate(['foo', 'bar', 'baz']):
+            item_1 = QtGui.QStandardItem('Item {}'.format(idx))
+            item_1.setEditable(False)
+            item_1.setDropEnabled(False)
+
+            item_2 = QtGui.QStandardItem(data)
+            item_2.setEditable(False)
+            item_2.setDropEnabled(False)
+
+            self.model.appendRow([item_1, item_2])
+
+class Testing(QtWidgets.QMainWindow):
+
+    def __init__(self):
+        super().__init__()
+
+        # Main widget
+        w = QtWidgets.QWidget()
+        l = QtWidgets.QVBoxLayout()
+        w.setLayout(l)
+        self.setCentralWidget(w)
+
+        # spacer
+        l.addWidget(QtWidgets.QLabel('top'), 1)
+
+        # Combo Box
+        l.addWidget(MyTableView(self))
+
+        # spacer
+        l.addWidget(QtWidgets.QLabel('bottom'), 1)
+
+        # A bit of window housekeeping
+        self.resize(400, 400)
+        self.setWindowTitle('Testing')
+        self.show()
+
+if __name__ == '__main__':
+
+    app = QtWidgets.QApplication([])
+    test = Testing()
+    sys.exit(app.exec_())

archive/spike.py

@@ -1,5 +1,3 @@
-
-
 # tl = Timeloop()
 #
 #
@@ -48,34 +46,34 @@
 #    rt.stop()  # better in a try/finally block to make sure the program ends!
 #    print("End")
 
-    #def kae2(self, index):
-    #    print(f"table header click, index={index}")
+# def kae2(self, index):
+#    print(f"table header click, index={index}")
 
-    #def kae(self, a, b, c):
-    #    self.data.append(f"a={a}, b={b}, c={c}")
+# def kae(self, a, b, c):
+#    self.data.append(f"a={a}, b={b}, c={c}")
 
-    #def mousePressEvent(self, QMouseEvent):
-    #    print("mouse press")
+# def mousePressEvent(self, QMouseEvent):
+#    print("mouse press")
 
-    #def mouseReleaseEvent(self, QMouseEvent):
-    #    print("mouse release")
-    #    # QMessageBox.about(
-    #    #     self,
-    #    #     "About Sample Editor",
-    #    #     "\n".join(self.data)
-    #    # )
-    #def eventFilter(self, obj, event):
-    #    # you could be doing different groups of actions
-    #    # for different types of widgets and either filtering
-    #    # the event or not.
-    #    # Here we just check if its one of the layout widgets
-    #    # if self.layout.indexOf(obj) != -1:
-    #    # print(f"event received: {event.type()}")
-    #    if event.type() == QEvent.MouseButtonPress:
-    #        print("Widget click")
-    #            # if I returned True right here, the event
-    #            # would be filtered and not reach the obj,
-    #            # meaning that I decided to handle it myself
+# def mouseReleaseEvent(self, QMouseEvent):
+#    print("mouse release")
+#    # QMessageBox.about(
+#    #     self,
+#    #     "About Sample Editor",
+#    #     "\n".join(self.data)
+#    # )
+# def eventFilter(self, obj, event):
+#    # you could be doing different groups of actions
+#    # for different types of widgets and either filtering
+#    # the event or not.
+#    # Here we just check if its one of the layout widgets
+#    # if self.layout.indexOf(obj) != -1:
+#    # print(f"event received: {event.type()}")
+#    if event.type() == QEvent.MouseButtonPress:
+#        print("Widget click")
+#            # if I returned True right here, the event
+#            # would be filtered and not reach the obj,
+#            # meaning that I decided to handle it myself
 
-    #    # regardless, just do the default
-    #    return super().eventFilter(obj, event)
+#    # regardless, just do the default
+#    return super().eventFilter(obj, event)

archive/todo/data.db

@@ -0,0 +1 @@
+[[false, "My first todo"], [true, "My second todo"], [true, "Another todo"], [false, "as"]]

archive/todo/mainwindow.ui

@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>275</width>
+    <height>314</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Todo</string>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QVBoxLayout" name="verticalLayout">
+    <item>
+     <widget class="QListView" name="todoView">
+      <property name="selectionMode">
+       <enum>QAbstractItemView::SingleSelection</enum>
+      </property>
+     </widget>
+    </item>
+    <item>
+     <widget class="QWidget" name="widget" native="true">
+      <layout class="QHBoxLayout" name="horizontalLayout">
+       <item>
+        <widget class="QPushButton" name="deleteButton">
+         <property name="text">
+          <string>Delete</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QPushButton" name="completeButton">
+         <property name="text">
+          <string>Complete</string>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+    </item>
+    <item>
+     <widget class="QLineEdit" name="todoEdit"/>
+    </item>
+    <item>
+     <widget class="QPushButton" name="addButton">
+      <property name="text">
+       <string>Add Todo</string>
+      </property>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+  <widget class="QMenuBar" name="menubar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>275</width>
+     <height>22</height>
+    </rect>
+   </property>
+  </widget>
+  <widget class="QStatusBar" name="statusbar"/>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

archive/todo/todo.py

@@ -0,0 +1,104 @@
+import sys
+import datetime
+import json
+from PyQt5 import QtCore, QtGui, QtWidgets, uic
+from PyQt5.QtCore import Qt
+
+
+qt_creator_file = "mainwindow.ui"
+Ui_MainWindow, QtBaseClass = uic.loadUiType(qt_creator_file)
+tick = QtGui.QImage("tick.png")
+
+
+class TodoModel(QtCore.QAbstractListModel):
+    def __init__(self, *args, todos=None, **kwargs):
+        super(TodoModel, self).__init__(*args, **kwargs)
+        self.todos = todos or []
+
+    def data(self, index, role):
+        if role == Qt.DisplayRole:
+            _, text = self.todos[index.row()]
+            return text
+
+        if role == Qt.DecorationRole:
+            status, _ = self.todos[index.row()]
+            if status:
+                return tick
+
+    def rowCount(self, index):
+        return len(self.todos)
+
+    def flags(self, index):
+        print(datetime.datetime.now().time().strftime("%H:%M:%S"))
+        return super().flags(index)
+
+
+class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
+    def __init__(self):
+        QtWidgets.QMainWindow.__init__(self)
+        Ui_MainWindow.__init__(self)
+        self.setupUi(self)
+        self.model = TodoModel()
+        self.load()
+        self.todoView.setModel(self.model)
+        self.addButton.pressed.connect(self.add)
+        self.deleteButton.pressed.connect(self.delete)
+        self.completeButton.pressed.connect(self.complete)
+
+    def add(self):
+        """
+        Add an item to our todo list, getting the text from the QLineEdit .todoEdit
+        and then clearing it.
+        """
+        text = self.todoEdit.text()
+        if text:  # Don't add empty strings.
+            # Access the list via the model.
+            self.model.todos.append((False, text))
+            # Trigger refresh.
+            self.model.layoutChanged.emit()
+            # Empty the input
+            self.todoEdit.setText("")
+            self.save()
+
+    def delete(self):
+        indexes = self.todoView.selectedIndexes()
+        if indexes:
+            # Indexes is a list of a single item in single-select mode.
+            index = indexes[0]
+            # Remove the item and refresh.
+            del self.model.todos[index.row()]
+            self.model.layoutChanged.emit()
+            # Clear the selection (as it is no longer valid).
+            self.todoView.clearSelection()
+            self.save()
+
+    def complete(self):
+        indexes = self.todoView.selectedIndexes()
+        if indexes:
+            index = indexes[0]
+            row = index.row()
+            status, text = self.model.todos[row]
+            self.model.todos[row] = (True, text)
+            # .dataChanged takes top-left and bottom right, which are equal
+            # for a single selection.
+            self.model.dataChanged.emit(index, index)
+            # Clear the selection (as it is no longer valid).
+            self.todoView.clearSelection()
+            self.save()
+
+    def load(self):
+        try:
+            with open("data.db", "r") as f:
+                self.model.todos = json.load(f)
+        except Exception:
+            pass
+
+    def save(self):
+        with open("data.db", "w") as f:
+            data = json.dump(self.model.todos, f)
+
+
+app = QtWidgets.QApplication(sys.argv)
+window = MainWindow()
+window.show()
+app.exec_()

archive/wheel_events.txt

@@ -0,0 +1,22 @@
+diff --git a/app/musicmuster.py b/app/musicmuster.py
+index d90644b..b53f3a8 100755
+--- a/app/musicmuster.py
++++ b/app/musicmuster.py
+@@ -1803,6 +1803,17 @@ class Window(QMainWindow, Ui_MainWindow):
+         else:
+             self.hdrNextTrack.setText("")
+ 
++    def wheelEvent(self, event):
++        """
++        Detect wheel events
++        """
++
++        delta = event.angleDelta().y() / 120
++        if delta > 0:
++            print("musicmuster.py Scroll Up")
++        else:
++            print("musicmuster.py Scroll Down")
++
+ 
+ class CartDialog(QDialog):
+     """Edit cart details"""

docs/Makefile

@@ -0,0 +1,20 @@
+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line, and also
+# from the environment for the first two.
+SPHINXOPTS    ?=
+SPHINXBUILD   ?= sphinx-build
+SOURCEDIR     = source
+BUILDDIR      = build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.PHONY: help Makefile
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)

docs/build/html/.buildinfo

@@ -0,0 +1,4 @@
+# Sphinx build info version 1
+# This file hashes the configuration used when building these files. When it is not found, a full rebuild will be done.
+config: dcac9a6ec03f5a33392ad4b5bcf42637
+tags: 645f666f9bcd5a90fca523b33c5a78b7

docs/build/html/_sources/development.rst.txt

@@ -0,0 +1,2 @@
+Development
+===========

docs/build/html/_sources/index.rst.txt

@@ -0,0 +1,25 @@
+.. MusicMuster documentation master file, created by
+   sphinx-quickstart on Sun Jul  2 17:58:44 2023.
+
+Welcome to MusicMuster's documentation!
+=======================================
+
+**MusicMuster** is a music player targeted at the production of live
+internet radio shows.
+
+Contents
+--------
+
+.. toctree::
+    introduction
+    installation
+    tutorial
+    reference
+    development
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`

docs/build/html/_sources/installation.rst.txt

@@ -0,0 +1,2 @@
+Installation
+============

docs/build/html/_sources/introduction.rst.txt

@@ -0,0 +1,87 @@
+Introduction
+============
+
+Why MusicMuster?
+----------------
+
+In January 2022 I started my show on `Mixcloud
+<https://www.mixcloud.com/KeithsMusicBox/>`. Until then, my show had
+been on an internet radio station which required me to use a Windows
+playout system. As I only use Linux, I had to set up a Windows PC
+specifically for that purpose. The system I had to use had what I felt
+were shortcomings in various areas.
+
+Once I moved to Mixcloud I searched for a Linux equivalent that didn't
+have the same shortcomings but was unable to find one that met my
+criteria. I decided to see how practical it would be to write my own,
+and MusicMuster was born.
+
+What is MusicMuster?
+--------------------
+
+It is a Linux-based music player. Whilst it could be used as a general
+home music player, there are much better applications for that role.
+**MusicMuster** has been specifically designed to support the
+production of live internet radio shows.
+
+Features
+--------
+
+* Database backed
+* Can be almost entirely keyboard driven
+* Open multiple playlists in tabs
+* Play tracks from any playlist
+* Add notes/comments to tracks on playlist
+* Automatatic colour-coding of notes/comments according to content
+* Preview tracks before playing to audience
+* Time of day clock
+* Elapsed track time counter
+* Time to run until track starts to fade
+* Time to run until track is silent
+* Graphic of volume from 5 seconds (configurable) before fade until
+  track is silent
+* Optionally hide played tracks in playlist
+* Button to drop playout volume by 3dB for talkover
+* Playlist displays:
+    * Title
+    * Artist
+    * Length of track (mm:ss)
+    * Estimated start time of track
+    * Estimated end time of track
+    * When track was last played
+    * Bits per second (bitrate) of track
+    * Length of leading silence in recording before track starts
+    * Total track length of arbitrary sections of tracks
+    * Commands that are sent to OBS Studio (eg, for automated scene
+      changes)
+* Playlist templates
+* Move selected or unplayed tracks between playlists
+* Download CSV of tracks played between arbitrary dates/times
+* Search for tracks by title or artist
+* Automatic search of current and next track in Wikipedia
+* Optional search of any track in Wikipedia
+* Optional search of any track in Songfacts
+
+
+Requirements
+------------
+
+.. note:: MusicMuster has only been tested on Debian 12, "Bookworm";
+   however, it should run on most contemporary Linux systems.
+
+The :doc:`installation` page explains how to build MusicMuster in its
+own environment which will automatcally install all requirements
+except the database. The current version of MusicMuster uses MariaDB
+version 10.11; however, any recent version of MariaDB should suffice.
+
+MusicMuster is a Python 3 application and requires Python 3.8 or
+later.
+
+
+Feedback, bugs, etc
+-------------------
+
+Please send to keith@midnighthax.com
+
+Keith Edmunds,
+July 2023

docs/build/html/_sources/reference.rst.txt

@@ -0,0 +1,2 @@
+Reference
+=========

docs/build/html/_sources/tutorial.rst.txt

@@ -0,0 +1,2 @@
+Tutorial
+========

docs/build/html/_static/alabaster.css

@@ -0,0 +1,703 @@
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+
+    div.document {
+        width: 100%;
+        margin: 0;
+    }
+
+    div.footer {
+        display: none;
+    }
+
+    div.bodywrapper {
+        margin: 0;
+    }
+
+    div.body {
+        min-height: 0;
+        padding: 0;
+    }
+
+    .rtd_doc_footer {
+        display: none;
+    }
+
+    .document {
+        width: auto;
+    }
+
+    .footer {
+        width: auto;
+    }
+
+    .footer {
+        width: auto;
+    }
+
+    .github {
+        display: none;
+    }
+}
+
+
+/* misc. */
+
+.revsys-inline {
+    display: none!important;
+}
+
+/* Make nested-list/multi-paragraph items look better in Releases changelog
+ * pages. Without this, docutils' magical list fuckery causes inconsistent
+ * formatting between different release sub-lists.
+ */
+div#changelog > div.section > ul > li > p:only-child {
+    margin-bottom: 0;
+}
+
+/* Hide fugly table cell borders in ..bibliography:: directive output */
+table.docutils.citation, table.docutils.citation td, table.docutils.citation th {
+  border: none;
+  /* Below needed in some edge cases; if not applied, bottom shadows appear */
+  -moz-box-shadow: none;
+  -webkit-box-shadow: none;
+  box-shadow: none;
+}
+
+
+/* relbar */
+
+.related {
+    line-height: 30px;
+    width: 100%;
+    font-size: 0.9rem;
+}
+
+.related.top {
+    border-bottom: 1px solid #EEE;
+    margin-bottom: 20px;
+}
+
+.related.bottom {
+    border-top: 1px solid #EEE;
+}
+
+.related ul {
+    padding: 0;
+    margin: 0;
+    list-style: none;
+}
+
+.related li {
+    display: inline;
+}
+
+nav#rellinks {
+    float: right;
+}
+
+nav#rellinks li+li:before {
+    content: "|";
+}
+
+nav#breadcrumbs li+li:before {
+    content: "\00BB";
+}
+
+/* Hide certain items when printing */
+@media print {
+    div.related {
+        display: none;
+    }
+}

docs/build/html/_static/basic.css

@@ -0,0 +1,903 @@
+/*
+ * basic.css
+ * ~~~~~~~~~
+ *
+ * Sphinx stylesheet -- basic theme.
+ *
+ * :copyright: Copyright 2007-2023 by the Sphinx team, see AUTHORS.
+ * :license: BSD, see LICENSE for details.
+ *
+ */
+
+/* -- main layout ----------------------------------------------------------- */
+
+div.clearer {
+    clear: both;
+}
+
+div.section::after {
+    display: block;
+    content: '';
+    clear: left;
+}
+
+/* -- relbar ---------------------------------------------------------------- */
+
+div.related {
+    width: 100%;
+    font-size: 90%;
+}
+
+div.related h3 {
+    display: none;
+}
+
+div.related ul {
+    margin: 0;
+    padding: 0 0 0 10px;
+    list-style: none;
+}
+
+div.related li {
+    display: inline;
+}
+
+div.related li.right {
+    float: right;
+    margin-right: 5px;
+}
+
+/* -- sidebar --------------------------------------------------------------- */
+
+div.sphinxsidebarwrapper {
+    padding: 10px 5px 0 10px;
+}
+
+div.sphinxsidebar {
+    float: left;
+    width: 230px;
+    margin-left: -100%;
+    font-size: 90%;
+    word-wrap: break-word;
+    overflow-wrap : break-word;
+}
+
+div.sphinxsidebar ul {
+    list-style: none;
+}
+
+div.sphinxsidebar ul ul,
+div.sphinxsidebar ul.want-points {
+    margin-left: 20px;
+    list-style: square;
+}
+
+div.sphinxsidebar ul ul {
+    margin-top: 0;
+    margin-bottom: 0;
+}
+
+div.sphinxsidebar form {
+    margin-top: 10px;
+}
+
+div.sphinxsidebar input {
+    border: 1px solid #98dbcc;
+    font-family: sans-serif;
+    font-size: 1em;
+}
+
+div.sphinxsidebar #searchbox form.search {
+    overflow: hidden;
+}
+
+div.sphinxsidebar #searchbox input[type="text"] {
+    float: left;
+    width: 80%;
+    padding: 0.25em;
+    box-sizing: border-box;
+}
+
+div.sphinxsidebar #searchbox input[type="submit"] {
+    float: left;
+    width: 20%;
+    border-left: none;
+    padding: 0.25em;
+    box-sizing: border-box;
+}
+
+
+img {
+    border: 0;
+    max-width: 100%;
+}
+
+/* -- search page ----------------------------------------------------------- */
+
+ul.search {
+    margin: 10px 0 0 20px;
+    padding: 0;
+}
+
+ul.search li {
+    padding: 5px 0 5px 20px;
+    background-image: url(file.png);
+    background-repeat: no-repeat;
+    background-position: 0 7px;
+}
+
+ul.search li a {
+    font-weight: bold;
+}
+
+ul.search li p.context {
+    color: #888;
+    margin: 2px 0 0 30px;
+    text-align: left;
+}
+
+ul.keywordmatches li.goodmatch a {
+    font-weight: bold;
+}
+
+/* -- index page ------------------------------------------------------------ */
+
+table.contentstable {
+    width: 90%;
+    margin-left: auto;
+    margin-right: auto;
+}
+
+table.contentstable p.biglink {
+    line-height: 150%;
+}
+
+a.biglink {
+    font-size: 1.3em;
+}
+
+span.linkdescr {
+    font-style: italic;
+    padding-top: 5px;
+    font-size: 90%;
+}
+
+/* -- general index --------------------------------------------------------- */
+
+table.indextable {
+    width: 100%;
+}
+
+table.indextable td {
+    text-align: left;
+    vertical-align: top;
+}
+
+table.indextable ul {
+    margin-top: 0;
+    margin-bottom: 0;
+    list-style-type: none;
+}
+
+table.indextable > tbody > tr > td > ul {
+    padding-left: 0em;
+}
+
+table.indextable tr.pcap {
+    height: 10px;
+}
+
+table.indextable tr.cap {
+    margin-top: 10px;
+    background-color: #f2f2f2;
+}
+
+img.toggler {
+    margin-right: 3px;
+    margin-top: 3px;
+    cursor: pointer;
+}
+
+div.modindex-jumpbox {
+    border-top: 1px solid #ddd;
+    border-bottom: 1px solid #ddd;
+    margin: 1em 0 1em 0;
+    padding: 0.4em;
+}
+
+div.genindex-jumpbox {
+    border-top: 1px solid #ddd;
+    border-bottom: 1px solid #ddd;
+    margin: 1em 0 1em 0;
+    padding: 0.4em;
+}
+
+/* -- domain module index --------------------------------------------------- */
+
+table.modindextable td {
+    padding: 2px;
+    border-collapse: collapse;
+}
+
+/* -- general body styles --------------------------------------------------- */
+
+div.body {
+    min-width: 360px;
+    max-width: 800px;
+}
+
+div.body p, div.body dd, div.body li, div.body blockquote {
+    -moz-hyphens: auto;
+    -ms-hyphens: auto;
+    -webkit-hyphens: auto;
+    hyphens: auto;
+}
+
+a.headerlink {
+    visibility: hidden;
+}
+
+h1:hover > a.headerlink,
+h2:hover > a.headerlink,
+h3:hover > a.headerlink,
+h4:hover > a.headerlink,
+h5:hover > a.headerlink,
+h6:hover > a.headerlink,
+dt:hover > a.headerlink,
+caption:hover > a.headerlink,
+p.caption:hover > a.headerlink,
+div.code-block-caption:hover > a.headerlink {
+    visibility: visible;
+}
+
+div.body p.caption {
+    text-align: inherit;
+}
+
+div.body td {
+    text-align: left;
+}
+
+.first {
+    margin-top: 0 !important;
+}
+
+p.rubric {
+    margin-top: 30px;
+    font-weight: bold;
+}
+
+img.align-left, figure.align-left, .figure.align-left, object.align-left {
+    clear: left;
+    float: left;
+    margin-right: 1em;
+}
+
+img.align-right, figure.align-right, .figure.align-right, object.align-right {
+    clear: right;
+    float: right;
+    margin-left: 1em;
+}
+
+img.align-center, figure.align-center, .figure.align-center, object.align-center {
+  display: block;
+  margin-left: auto;
+  margin-right: auto;
+}
+
+img.align-default, figure.align-default, .figure.align-default {
+  display: block;
+  margin-left: auto;
+  margin-right: auto;
+}
+
+.align-left {
+    text-align: left;
+}
+
+.align-center {
+    text-align: center;
+}
+
+.align-default {
+    text-align: center;
+}
+
+.align-right {
+    text-align: right;
+}
+
+/* -- sidebars -------------------------------------------------------------- */
+
+div.sidebar,
+aside.sidebar {
+    margin: 0 0 0.5em 1em;
+    border: 1px solid #ddb;
+    padding: 7px;
+    background-color: #ffe;
+    width: 40%;
+    float: right;
+    clear: right;
+    overflow-x: auto;
+}
+
+p.sidebar-title {
+    font-weight: bold;
+}
+
+nav.contents,
+aside.topic,
+div.admonition, div.topic, blockquote {
+    clear: left;
+}
+
+/* -- topics ---------------------------------------------------------------- */
+
+nav.contents,
+aside.topic,
+div.topic {
+    border: 1px solid #ccc;
+    padding: 7px;
+    margin: 10px 0 10px 0;
+}
+
+p.topic-title {
+    font-size: 1.1em;
+    font-weight: bold;
+    margin-top: 10px;
+}
+
+/* -- admonitions ----------------------------------------------------------- */
+
+div.admonition {
+    margin-top: 10px;
+    margin-bottom: 10px;
+    padding: 7px;
+}
+
+div.admonition dt {
+    font-weight: bold;
+}
+
+p.admonition-title {
+    margin: 0px 10px 5px 0px;
+    font-weight: bold;
+}
+
+div.body p.centered {
+    text-align: center;
+    margin-top: 25px;
+}
+
+/* -- content of sidebars/topics/admonitions -------------------------------- */
+
+div.sidebar > :last-child,
+aside.sidebar > :last-child,
+nav.contents > :last-child,
+aside.topic > :last-child,
+div.topic > :last-child,
+div.admonition > :last-child {
+    margin-bottom: 0;
+}
+
+div.sidebar::after,
+aside.sidebar::after,
+nav.contents::after,
+aside.topic::after,
+div.topic::after,
+div.admonition::after,
+blockquote::after {
+    display: block;
+    content: '';
+    clear: both;
+}
+
+/* -- tables ---------------------------------------------------------------- */
+
+table.docutils {
+    margin-top: 10px;
+    margin-bottom: 10px;
+    border: 0;
+    border-collapse: collapse;
+}
+
+table.align-center {
+    margin-left: auto;
+    margin-right: auto;
+}
+
+table.align-default {
+    margin-left: auto;
+    margin-right: auto;
+}
+
+table caption span.caption-number {
+    font-style: italic;
+}
+
+table caption span.caption-text {
+}
+
+table.docutils td, table.docutils th {
+    padding: 1px 8px 1px 5px;
+    border-top: 0;
+    border-left: 0;
+    border-right: 0;
+    border-bottom: 1px solid #aaa;
+}
+
+th {
+    text-align: left;
+    padding-right: 5px;
+}
+
+table.citation {
+    border-left: solid 1px gray;
+    margin-left: 1px;
+}
+
+table.citation td {
+    border-bottom: none;
+}
+
+th > :first-child,
+td > :first-child {
+    margin-top: 0px;
+}
+
+th > :last-child,
+td > :last-child {
+    margin-bottom: 0px;
+}
+
+/* -- figures --------------------------------------------------------------- */
+
+div.figure, figure {
+    margin: 0.5em;
+    padding: 0.5em;
+}
+
+div.figure p.caption, figcaption {
+    padding: 0.3em;
+}
+
+div.figure p.caption span.caption-number,
+figcaption span.caption-number {
+    font-style: italic;
+}
+
+div.figure p.caption span.caption-text,
+figcaption span.caption-text {
+}
+
+/* -- field list styles ----------------------------------------------------- */
+
+table.field-list td, table.field-list th {
+    border: 0 !important;
+}
+
+.field-list ul {
+    margin: 0;
+    padding-left: 1em;
+}
+
+.field-list p {
+    margin: 0;
+}
+
+.field-name {
+    -moz-hyphens: manual;
+    -ms-hyphens: manual;
+    -webkit-hyphens: manual;
+    hyphens: manual;
+}
+
+/* -- hlist styles ---------------------------------------------------------- */
+
+table.hlist {
+    margin: 1em 0;
+}
+
+table.hlist td {
+    vertical-align: top;
+}
+
+/* -- object description styles --------------------------------------------- */
+
+.sig {
+	font-family: 'Consolas', 'Menlo', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', monospace;
+}
+
+.sig-name, code.descname {
+    background-color: transparent;
+    font-weight: bold;
+}
+
+.sig-name {
+	font-size: 1.1em;
+}
+
+code.descname {
+    font-size: 1.2em;
+}
+
+.sig-prename, code.descclassname {
+    background-color: transparent;
+}
+
+.optional {
+    font-size: 1.3em;
+}
+
+.sig-paren {
+    font-size: larger;
+}
+
+.sig-param.n {
+	font-style: italic;
+}
+
+/* C++ specific styling */
+
+.sig-inline.c-texpr,
+.sig-inline.cpp-texpr {
+	font-family: unset;
+}
+
+.sig.c   .k, .sig.c   .kt,
+.sig.cpp .k, .sig.cpp .kt {
+	color: #0033B3;
+}
+
+.sig.c   .m,
+.sig.cpp .m {
+	color: #1750EB;
+}
+
+.sig.c   .s, .sig.c   .sc,
+.sig.cpp .s, .sig.cpp .sc {
+	color: #067D17;
+}
+
+
+/* -- other body styles ----------------------------------------------------- */
+
+ol.arabic {
+    list-style: decimal;
+}
+
+ol.loweralpha {
+    list-style: lower-alpha;
+}
+
+ol.upperalpha {
+    list-style: upper-alpha;
+}
+
+ol.lowerroman {
+    list-style: lower-roman;
+}
+
+ol.upperroman {
+    list-style: upper-roman;
+}
+
+:not(li) > ol > li:first-child > :first-child,
+:not(li) > ul > li:first-child > :first-child {
+    margin-top: 0px;
+}
+
+:not(li) > ol > li:last-child > :last-child,
+:not(li) > ul > li:last-child > :last-child {
+    margin-bottom: 0px;
+}
+
+ol.simple ol p,
+ol.simple ul p,
+ul.simple ol p,
+ul.simple ul p {
+    margin-top: 0;
+}
+
+ol.simple > li:not(:first-child) > p,
+ul.simple > li:not(:first-child) > p {
+    margin-top: 0;
+}
+
+ol.simple p,
+ul.simple p {
+    margin-bottom: 0;
+}
+
+aside.footnote > span,
+div.citation > span {
+    float: left;
+}
+aside.footnote > span:last-of-type,
+div.citation > span:last-of-type {
+  padding-right: 0.5em;
+}
+aside.footnote > p {
+  margin-left: 2em;
+}
+div.citation > p {
+  margin-left: 4em;
+}
+aside.footnote > p:last-of-type,
+div.citation > p:last-of-type {
+    margin-bottom: 0em;
+}
+aside.footnote > p:last-of-type:after,
+div.citation > p:last-of-type:after {
+    content: "";
+    clear: both;
+}
+
+dl.field-list {
+    display: grid;
+    grid-template-columns: fit-content(30%) auto;
+}
+
+dl.field-list > dt {
+    font-weight: bold;
+    word-break: break-word;
+    padding-left: 0.5em;
+    padding-right: 5px;
+}
+
+dl.field-list > dd {
+    padding-left: 0.5em;
+    margin-top: 0em;
+    margin-left: 0em;
+    margin-bottom: 0em;
+}
+
+dl {
+    margin-bottom: 15px;
+}
+
+dd > :first-child {
+    margin-top: 0px;
+}
+
+dd ul, dd table {
+    margin-bottom: 10px;
+}
+
+dd {
+    margin-top: 3px;
+    margin-bottom: 10px;
+    margin-left: 30px;
+}
+
+dl > dd:last-child,
+dl > dd:last-child > :last-child {
+    margin-bottom: 0;
+}
+
+dt:target, span.highlighted {
+    background-color: #fbe54e;
+}
+
+rect.highlighted {
+    fill: #fbe54e;
+}
+
+dl.glossary dt {
+    font-weight: bold;
+    font-size: 1.1em;
+}
+
+.versionmodified {
+    font-style: italic;
+}
+
+.system-message {
+    background-color: #fda;
+    padding: 5px;
+    border: 3px solid red;
+}
+
+.footnote:target  {
+    background-color: #ffa;
+}
+
+.line-block {
+    display: block;
+    margin-top: 1em;
+    margin-bottom: 1em;
+}
+
+.line-block .line-block {
+    margin-top: 0;
+    margin-bottom: 0;
+    margin-left: 1.5em;
+}
+
+.guilabel, .menuselection {
+    font-family: sans-serif;
+}
+
+.accelerator {
+    text-decoration: underline;
+}
+
+.classifier {
+    font-style: oblique;
+}
+
+.classifier:before {
+    font-style: normal;
+    margin: 0 0.5em;
+    content: ":";
+    display: inline-block;
+}
+
+abbr, acronym {
+    border-bottom: dotted 1px;
+    cursor: help;
+}
+
+/* -- code displays --------------------------------------------------------- */
+
+pre {
+    overflow: auto;
+    overflow-y: hidden;  /* fixes display issues on Chrome browsers */
+}
+
+pre, div[class*="highlight-"] {
+    clear: both;
+}
+
+span.pre {
+    -moz-hyphens: none;
+    -ms-hyphens: none;
+    -webkit-hyphens: none;
+    hyphens: none;
+    white-space: nowrap;
+}
+
+div[class*="highlight-"] {
+    margin: 1em 0;
+}
+
+td.linenos pre {
+    border: 0;
+    background-color: transparent;
+    color: #aaa;
+}
+
+table.highlighttable {
+    display: block;
+}
+
+table.highlighttable tbody {
+    display: block;
+}
+
+table.highlighttable tr {
+    display: flex;
+}
+
+table.highlighttable td {
+    margin: 0;
+    padding: 0;
+}
+
+table.highlighttable td.linenos {
+    padding-right: 0.5em;
+}
+
+table.highlighttable td.code {
+    flex: 1;
+    overflow: hidden;
+}
+
+.highlight .hll {
+    display: block;
+}
+
+div.highlight pre,
+table.highlighttable pre {
+    margin: 0;
+}
+
+div.code-block-caption + div {
+    margin-top: 0;
+}
+
+div.code-block-caption {
+    margin-top: 1em;
+    padding: 2px 5px;
+    font-size: small;
+}
+
+div.code-block-caption code {
+    background-color: transparent;
+}
+
+table.highlighttable td.linenos,
+span.linenos,
+div.highlight span.gp {  /* gp: Generic.Prompt */
+  user-select: none;
+  -webkit-user-select: text; /* Safari fallback only */
+  -webkit-user-select: none; /* Chrome/Safari */
+  -moz-user-select: none; /* Firefox */
+  -ms-user-select: none; /* IE10+ */
+}
+
+div.code-block-caption span.caption-number {
+    padding: 0.1em 0.3em;
+    font-style: italic;
+}
+
+div.code-block-caption span.caption-text {
+}
+
+div.literal-block-wrapper {
+    margin: 1em 0;
+}
+
+code.xref, a code {
+    background-color: transparent;
+    font-weight: bold;
+}
+
+h1 code, h2 code, h3 code, h4 code, h5 code, h6 code {
+    background-color: transparent;
+}
+
+.viewcode-link {
+    float: right;
+}
+
+.viewcode-back {
+    float: right;
+    font-family: sans-serif;
+}
+
+div.viewcode-block:target {
+    margin: -1px -10px;
+    padding: 0 10px;
+}
+
+/* -- math display ---------------------------------------------------------- */
+
+img.math {
+    vertical-align: middle;
+}
+
+div.body div.math p {
+    text-align: center;
+}
+
+span.eqno {
+    float: right;
+}
+
+span.eqno a.headerlink {
+    position: absolute;
+    z-index: 1;
+}
+
+div.math:hover a.headerlink {
+    visibility: visible;
+}
+
+/* -- printout stylesheet --------------------------------------------------- */
+
+@media print {
+    div.document,
+    div.documentwrapper,
+    div.bodywrapper {
+        margin: 0 !important;
+        width: 100%;
+    }
+
+    div.sphinxsidebar,
+    div.related,
+    div.footer,
+    #top-link {
+        display: none;
+    }
+}

docs/build/html/_static/custom.css

@@ -0,0 +1 @@
+/* This file intentionally left blank. */

docs/build/html/_static/debug.css

@@ -0,0 +1,69 @@
+/*
+  This CSS file should be overridden by the theme authors. It's
+  meant for debugging and developing the skeleton that this theme provides.
+*/
+body {
+  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif,
+    "Apple Color Emoji", "Segoe UI Emoji";
+  background: lavender;
+}
+.sb-announcement {
+  background: rgb(131, 131, 131);
+}
+.sb-announcement__inner {
+  background: black;
+  color: white;
+}
+.sb-header {
+  background: lightskyblue;
+}
+.sb-header__inner {
+  background: royalblue;
+  color: white;
+}
+.sb-header-secondary {
+  background: lightcyan;
+}
+.sb-header-secondary__inner {
+  background: cornflowerblue;
+  color: white;
+}
+.sb-sidebar-primary {
+  background: lightgreen;
+}
+.sb-main {
+  background: blanchedalmond;
+}
+.sb-main__inner {
+  background: antiquewhite;
+}
+.sb-header-article {
+  background: lightsteelblue;
+}
+.sb-article-container {
+  background: snow;
+}
+.sb-article-main {
+  background: white;
+}
+.sb-footer-article {
+  background: lightpink;
+}
+.sb-sidebar-secondary {
+  background: lightgoldenrodyellow;
+}
+.sb-footer-content {
+  background: plum;
+}
+.sb-footer-content__inner {
+  background: palevioletred;
+}
+.sb-footer {
+  background: pink;
+}
+.sb-footer__inner {
+  background: salmon;
+}
+.sb-article {
+  background: white;
+}

docs/build/html/_static/doctools.js

@@ -0,0 +1,156 @@
+/*
+ * doctools.js
+ * ~~~~~~~~~~~
+ *
+ * Base JavaScript utilities for all Sphinx HTML documentation.
+ *
+ * :copyright: Copyright 2007-2023 by the Sphinx team, see AUTHORS.
+ * :license: BSD, see LICENSE for details.
+ *
+ */
+"use strict";
+
+const BLACKLISTED_KEY_CONTROL_ELEMENTS = new Set([
+  "TEXTAREA",
+  "INPUT",
+  "SELECT",
+  "BUTTON",
+]);
+
+const _ready = (callback) => {
+  if (document.readyState !== "loading") {
+    callback();
+  } else {
+    document.addEventListener("DOMContentLoaded", callback);
+  }
+};
+
+/**
+ * Small JavaScript module for the documentation.
+ */
+const Documentation = {
+  init: () => {
+    Documentation.initDomainIndexTable();
+    Documentation.initOnKeyListeners();
+  },
+
+  /**
+   * i18n support
+   */
+  TRANSLATIONS: {},
+  PLURAL_EXPR: (n) => (n === 1 ? 0 : 1),
+  LOCALE: "unknown",
+
+  // gettext and ngettext don't access this so that the functions
+  // can safely bound to a different name (_ = Documentation.gettext)
+  gettext: (string) => {
+    const translated = Documentation.TRANSLATIONS[string];
+    switch (typeof translated) {
+      case "undefined":
+        return string; // no translation
+      case "string":
+        return translated; // translation exists
+      default:
+        return translated[0]; // (singular, plural) translation tuple exists
+    }
+  },
+
+  ngettext: (singular, plural, n) => {
+    const translated = Documentation.TRANSLATIONS[singular];
+    if (typeof translated !== "undefined")
+      return translated[Documentation.PLURAL_EXPR(n)];
+    return n === 1 ? singular : plural;
+  },
+
+  addTranslations: (catalog) => {
+    Object.assign(Documentation.TRANSLATIONS, catalog.messages);
+    Documentation.PLURAL_EXPR = new Function(
+      "n",
+      `return (${catalog.plural_expr})`
+    );
+    Documentation.LOCALE = catalog.locale;
+  },
+
+  /**
+   * helper function to focus on search bar
+   */
+  focusSearchBar: () => {
+    document.querySelectorAll("input[name=q]")[0]?.focus();
+  },
+
+  /**
+   * Initialise the domain index toggle buttons
+   */
+  initDomainIndexTable: () => {
+    const toggler = (el) => {
+      const idNumber = el.id.substr(7);
+      const toggledRows = document.querySelectorAll(`tr.cg-${idNumber}`);
+      if (el.src.substr(-9) === "minus.png") {
+        el.src = `${el.src.substr(0, el.src.length - 9)}plus.png`;
+        toggledRows.forEach((el) => (el.style.display = "none"));
+      } else {
+        el.src = `${el.src.substr(0, el.src.length - 8)}minus.png`;
+        toggledRows.forEach((el) => (el.style.display = ""));
+      }
+    };
+
+    const togglerElements = document.querySelectorAll("img.toggler");
+    togglerElements.forEach((el) =>
+      el.addEventListener("click", (event) => toggler(event.currentTarget))
+    );
+    togglerElements.forEach((el) => (el.style.display = ""));
+    if (DOCUMENTATION_OPTIONS.COLLAPSE_INDEX) togglerElements.forEach(toggler);
+  },
+
+  initOnKeyListeners: () => {
+    // only install a listener if it is really needed
+    if (
+      !DOCUMENTATION_OPTIONS.NAVIGATION_WITH_KEYS &&
+      !DOCUMENTATION_OPTIONS.ENABLE_SEARCH_SHORTCUTS
+    )
+      return;
+
+    document.addEventListener("keydown", (event) => {
+      // bail for input elements
+      if (BLACKLISTED_KEY_CONTROL_ELEMENTS.has(document.activeElement.tagName)) return;
+      // bail with special keys
+      if (event.altKey || event.ctrlKey || event.metaKey) return;
+
+      if (!event.shiftKey) {
+        switch (event.key) {
+          case "ArrowLeft":
+            if (!DOCUMENTATION_OPTIONS.NAVIGATION_WITH_KEYS) break;
+
+            const prevLink = document.querySelector('link[rel="prev"]');
+            if (prevLink && prevLink.href) {
+              window.location.href = prevLink.href;
+              event.preventDefault();
+            }
+            break;
+          case "ArrowRight":
+            if (!DOCUMENTATION_OPTIONS.NAVIGATION_WITH_KEYS) break;
+
+            const nextLink = document.querySelector('link[rel="next"]');
+            if (nextLink && nextLink.href) {
+              window.location.href = nextLink.href;
+              event.preventDefault();
+            }
+            break;
+        }
+      }
+
+      // some keyboard layouts may need Shift to get /
+      switch (event.key) {
+        case "/":
+          if (!DOCUMENTATION_OPTIONS.ENABLE_SEARCH_SHORTCUTS) break;
+          Documentation.focusSearchBar();
+          event.preventDefault();
+      }
+    });
+  },
+};
+
+// quick alias for translations
+const _ = Documentation.gettext;
+
+_ready(Documentation.init);

docs/build/html/_static/documentation_options.js

@@ -0,0 +1,14 @@
+var DOCUMENTATION_OPTIONS = {
+    URL_ROOT: document.getElementById("documentation_options").getAttribute('data-url_root'),
+    VERSION: '2.11.2',
+    LANGUAGE: 'en',
+    COLLAPSE_INDEX: false,
+    BUILDER: 'html',
+    FILE_SUFFIX: '.html',
+    LINK_SUFFIX: '.html',
+    HAS_SOURCE: true,
+    SOURCELINK_SUFFIX: '.txt',
+    NAVIGATION_WITH_KEYS: false,
+    SHOW_SEARCH_SUMMARY: true,
+    ENABLE_SEARCH_SHORTCUTS: true,
+};

docs/build/html/_static/language_data.js

@@ -0,0 +1,199 @@
+/*
+ * language_data.js
+ * ~~~~~~~~~~~~~~~~
+ *
+ * This script contains the language-specific data used by searchtools.js,
+ * namely the list of stopwords, stemmer, scorer and splitter.
+ *
+ * :copyright: Copyright 2007-2023 by the Sphinx team, see AUTHORS.
+ * :license: BSD, see LICENSE for details.
+ *
+ */
+
+var stopwords = ["a", "and", "are", "as", "at", "be", "but", "by", "for", "if", "in", "into", "is", "it", "near", "no", "not", "of", "on", "or", "such", "that", "the", "their", "then", "there", "these", "they", "this", "to", "was", "will", "with"];
+
+
+/* Non-minified version is copied as a separate JS file, is available */
+
+/**
+ * Porter Stemmer
+ */
+var Stemmer = function() {
+
+  var step2list = {
+    ational: 'ate',
+    tional: 'tion',
+    enci: 'ence',
+    anci: 'ance',
+    izer: 'ize',
+    bli: 'ble',
+    alli: 'al',
+    entli: 'ent',
+    eli: 'e',
+    ousli: 'ous',
+    ization: 'ize',
+    ation: 'ate',
+    ator: 'ate',
+    alism: 'al',
+    iveness: 'ive',
+    fulness: 'ful',
+    ousness: 'ous',
+    aliti: 'al',
+    iviti: 'ive',
+    biliti: 'ble',
+    logi: 'log'
+  };
+
+  var step3list = {
+    icate: 'ic',
+    ative: '',
+    alize: 'al',
+    iciti: 'ic',
+    ical: 'ic',
+    ful: '',
+    ness: ''
+  };
+
+  var c = "[^aeiou]";          // consonant
+  var v = "[aeiouy]";          // vowel
+  var C = c + "[^aeiouy]*";    // consonant sequence
+  var V = v + "[aeiou]*";      // vowel sequence
+
+  var mgr0 = "^(" + C + ")?" + V + C;                      // [C]VC... is m>0
+  var meq1 = "^(" + C + ")?" + V + C + "(" + V + ")?$";    // [C]VC[V] is m=1
+  var mgr1 = "^(" + C + ")?" + V + C + V + C;              // [C]VCVC... is m>1
+  var s_v   = "^(" + C + ")?" + v;                         // vowel in stem
+
+  this.stemWord = function (w) {
+    var stem;
+    var suffix;
+    var firstch;
+    var origword = w;
+
+    if (w.length < 3)
+      return w;
+
+    var re;
+    var re2;
+    var re3;
+    var re4;
+
+    firstch = w.substr(0,1);
+    if (firstch == "y")
+      w = firstch.toUpperCase() + w.substr(1);
+
+    // Step 1a
+    re = /^(.+?)(ss|i)es$/;
+    re2 = /^(.+?)([^s])s$/;
+
+    if (re.test(w))
+      w = w.replace(re,"$1$2");
+    else if (re2.test(w))
+      w = w.replace(re2,"$1$2");
+
+    // Step 1b
+    re = /^(.+?)eed$/;
+    re2 = /^(.+?)(ed|ing)$/;
+    if (re.test(w)) {
+      var fp = re.exec(w);
+      re = new RegExp(mgr0);
+      if (re.test(fp[1])) {
+        re = /.$/;
+        w = w.replace(re,"");
+      }
+    }
+    else if (re2.test(w)) {
+      var fp = re2.exec(w);
+      stem = fp[1];
+      re2 = new RegExp(s_v);
+      if (re2.test(stem)) {
+        w = stem;
+        re2 = /(at|bl|iz)$/;
+        re3 = new RegExp("([^aeiouylsz])\\1$");
+        re4 = new RegExp("^" + C + v + "[^aeiouwxy]$");
+        if (re2.test(w))
+          w = w + "e";
+        else if (re3.test(w)) {
+          re = /.$/;
+          w = w.replace(re,"");
+        }
+        else if (re4.test(w))
+          w = w + "e";
+      }
+    }
+
+    // Step 1c
+    re = /^(.+?)y$/;
+    if (re.test(w)) {
+      var fp = re.exec(w);
+      stem = fp[1];
+      re = new RegExp(s_v);
+      if (re.test(stem))
+        w = stem + "i";
+    }
+
+    // Step 2
+    re = /^(.+?)(ational|tional|enci|anci|izer|bli|alli|entli|eli|ousli|ization|ation|ator|alism|iveness|fulness|ousness|aliti|iviti|biliti|logi)$/;
+    if (re.test(w)) {
+      var fp = re.exec(w);
+      stem = fp[1];
+      suffix = fp[2];
+      re = new RegExp(mgr0);
+      if (re.test(stem))
+        w = stem + step2list[suffix];
+    }
+
+    // Step 3
+    re = /^(.+?)(icate|ative|alize|iciti|ical|ful|ness)$/;
+    if (re.test(w)) {
+      var fp = re.exec(w);
+      stem = fp[1];
+      suffix = fp[2];
+      re = new RegExp(mgr0);
+      if (re.test(stem))
+        w = stem + step3list[suffix];
+    }
+
+    // Step 4
+    re = /^(.+?)(al|ance|ence|er|ic|able|ible|ant|ement|ment|ent|ou|ism|ate|iti|ous|ive|ize)$/;
+    re2 = /^(.+?)(s|t)(ion)$/;
+    if (re.test(w)) {
+      var fp = re.exec(w);
+      stem = fp[1];
+      re = new RegExp(mgr1);
+      if (re.test(stem))
+        w = stem;
+    }
+    else if (re2.test(w)) {
+      var fp = re2.exec(w);
+      stem = fp[1] + fp[2];
+      re2 = new RegExp(mgr1);
+      if (re2.test(stem))
+        w = stem;
+    }
+
+    // Step 5
+    re = /^(.+?)e$/;
+    if (re.test(w)) {
+      var fp = re.exec(w);
+      stem = fp[1];
+      re = new RegExp(mgr1);
+      re2 = new RegExp(meq1);
+      re3 = new RegExp("^" + C + v + "[^aeiouwxy]$");
+      if (re.test(stem) || (re2.test(stem) && !(re3.test(stem))))
+        w = stem;
+    }
+    re = /ll$/;
+    re2 = new RegExp(mgr1);
+    if (re.test(w) && re2.test(w)) {
+      re = /.$/;
+      w = w.replace(re,"");
+    }
+
+    // and turn initial Y back to y
+    if (firstch == "y")
+      w = firstch.toLowerCase() + w.substr(1);
+    return w;
+  }
+}
+