8 changed files with 87 additions and 142 deletions
--- a/pdm.lock
+++ b/pdm.lock
@ -183,106 +183,100 @@ files = [

 [[package]]
 name = "pyobjc-core"
-version = "10.3.1"
+version = "10.2"
 requires_python = ">=3.8"
 summary = "Python<->ObjC Interoperability Module"
 files = [
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 ]

 [[package]]
 name = "pyobjc-framework-avfoundation"
-version = "10.3.1"
+version = "10.2"
 requires_python = ">=3.8"
 summary = "Wrappers for the framework AVFoundation on macOS"
 dependencies = [
-    "pyobjc-core>=10.3.1",
-    "pyobjc-framework-Cocoa>=10.3.1",
-    "pyobjc-framework-CoreAudio>=10.3.1",
-    "pyobjc-framework-CoreMedia>=10.3.1",
-    "pyobjc-framework-Quartz>=10.3.1",
+    "pyobjc-core>=10.2",
+    "pyobjc-framework-Cocoa>=10.2",
+    "pyobjc-framework-CoreAudio>=10.2",
+    "pyobjc-framework-CoreMedia>=10.2",
+    "pyobjc-framework-Quartz>=10.2",
 ]
 files = [
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 ]

 [[package]]
 name = "pyobjc-framework-cocoa"
-version = "10.3.1"
+version = "10.2"
 requires_python = ">=3.8"
 summary = "Wrappers for the Cocoa frameworks on macOS"
 dependencies = [
-    "pyobjc-core>=10.3.1",
+    "pyobjc-core>=10.2",
 ]
 files = [
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 ]

 [[package]]
 name = "pyobjc-framework-coreaudio"
-version = "10.3.1"
+version = "10.2"
 requires_python = ">=3.8"
 summary = "Wrappers for the framework CoreAudio on macOS"
 dependencies = [
-    "pyobjc-core>=10.3.1",
-    "pyobjc-framework-Cocoa>=10.3.1",
+    "pyobjc-core>=10.2",
+    "pyobjc-framework-Cocoa>=10.2",
 ]
 files = [
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 ]

 [[package]]
 name = "pyobjc-framework-coremedia"
-version = "10.3.1"
+version = "10.2"
 requires_python = ">=3.8"
 summary = "Wrappers for the framework CoreMedia on macOS"
 dependencies = [
-    "pyobjc-core>=10.3.1",
-    "pyobjc-framework-Cocoa>=10.3.1",
+    "pyobjc-core>=10.2",
+    "pyobjc-framework-Cocoa>=10.2",
 ]
 files = [
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 ]

 [[package]]
 name = "pyobjc-framework-mediaplayer"
-version = "10.3.1"
+version = "10.2"
 requires_python = ">=3.8"
 summary = "Wrappers for the framework MediaPlayer on macOS"
 dependencies = [
-    "pyobjc-core>=10.3.1",
-    "pyobjc-framework-AVFoundation>=10.3.1",
+    "pyobjc-core>=10.2",
+    "pyobjc-framework-AVFoundation>=10.2",
 ]
 files = [
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 [[package]]
 name = "pyobjc-framework-quartz"
-version = "10.3.1"
+version = "10.2"
 requires_python = ">=3.8"
 summary = "Wrappers for the Quartz frameworks on macOS"
 dependencies = [
-    "pyobjc-core>=10.3.1",
-    "pyobjc-framework-Cocoa>=10.3.1",
+    "pyobjc-core>=10.2",
+    "pyobjc-framework-Cocoa>=10.2",
 ]
 files = [
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 ]

 [[package]]
@ -327,27 +321,27 @@ files = [

 [[package]]
 name = "ruff"
-version = "0.4.10"
+version = "0.4.4"
 requires_python = ">=3.7"
 summary = "An extremely fast Python linter and code formatter, written in Rust."
 files = [
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 ]

 [[package]]
--- a/pyproject.toml
+++ b/pyproject.toml
@ -52,6 +52,7 @@ build-backend = "pdm.backend"
 mypy_path = 'stubs'

 [tool.ruff.lint]
+ignore-init-module-imports = true
 select = [
    # pycodestyle
    "E4", # import
--- a/src/mpd_now_playable/cocoa/now_playing.py
+++ b/src/mpd_now_playable/cocoa/now_playing.py
@ -78,12 +78,6 @@ def playback_state_to_cocoa(state: PlaybackState) -> MPMusicPlaybackState:
 	return mapping[state]


-def join_plural_field(field: list[str]) -> str | None:
-	if field:
-		return ", ".join(field)
-	return None
-
-
 def song_to_media_item(song: Song) -> NSMutableDictionary:
 	nowplaying_info = nothing_to_media_item()
 	nowplaying_info[MPNowPlayingInfoPropertyMediaType] = MPNowPlayingInfoMediaTypeAudio
@ -94,12 +88,12 @@ def song_to_media_item(song: Song) -> NSMutableDictionary:
 	nowplaying_info[MPMediaItemPropertyPersistentID] = song_to_persistent_id(song)

 	nowplaying_info[MPMediaItemPropertyTitle] = song.title
-	nowplaying_info[MPMediaItemPropertyArtist] = join_plural_field(song.artist)
-	nowplaying_info[MPMediaItemPropertyAlbumTitle] = join_plural_field(song.album)
+	nowplaying_info[MPMediaItemPropertyArtist] = song.artist
+	nowplaying_info[MPMediaItemPropertyAlbumTitle] = song.album
 	nowplaying_info[MPMediaItemPropertyAlbumTrackNumber] = song.track
 	nowplaying_info[MPMediaItemPropertyDiscNumber] = song.disc
-	nowplaying_info[MPMediaItemPropertyGenre] = join_plural_field(song.genre)
-	nowplaying_info[MPMediaItemPropertyComposer] = join_plural_field(song.composer)
+	nowplaying_info[MPMediaItemPropertyGenre] = song.genre
+	nowplaying_info[MPMediaItemPropertyComposer] = song.composer
 	nowplaying_info[MPMediaItemPropertyPlaybackDuration] = song.duration

 	# MPD can't play back music at different rates, so we just want to set it
--- a/src/mpd_now_playable/mpd/artwork_cache.py
+++ b/src/mpd_now_playable/mpd/artwork_cache.py
@ -6,7 +6,6 @@ from yarl import URL

 from ..cache import Cache, make_cache
 from ..tools.asyncio import run_background_task
-from ..tools.types import un_maybe_plural
 from .types import CurrentSongResponse, MpdStateHandler

 CACHE_TTL = 60 * 60  # seconds = 1 hour
@ -17,11 +16,9 @@ class ArtCacheEntry(TypedDict):


 def calc_album_key(song: CurrentSongResponse) -> str:
-	artist = sorted(
-		un_maybe_plural(song.get("albumartist", song.get("artist", "Unknown Artist")))
-	)
-	album = sorted(un_maybe_plural(song.get("album", "Unknown Album")))
-	return ":".join(";".join(t).replace(":", "-") for t in (artist, album))
+	artist = song.get("albumartist", song.get("artist", "Unknown Artist"))
+	album = song.get("album", "Unknown Album")
+	return ":".join(t.replace(":", "-") for t in (artist, album))


 def calc_track_key(song: CurrentSongResponse) -> str:
--- a/src/mpd_now_playable/mpd/listener.py
+++ b/src/mpd_now_playable/mpd/listener.py
@ -9,7 +9,7 @@ from yarl import URL
 from ..config.model import MpdConfig
 from ..player import Player
 from ..song import PlaybackState, Song, SongListener
-from ..tools.types import convert_if_exists, un_maybe_plural
+from ..tools.types import convert_if_exists
 from .artwork_cache import MpdArtworkCache
 from .types import CurrentSongResponse, StatusResponse

@ -27,11 +27,11 @@ def mpd_current_to_song(
 			current.get("musicbrainz_releasetrackid"), UUID
 		),
 		title=current.get("title"),
-		artist=un_maybe_plural(current.get("artist")),
-		album=un_maybe_plural(current.get("album")),
-		album_artist=un_maybe_plural(current.get("albumartist")),
-		composer=un_maybe_plural(current.get("composer")),
-		genre=un_maybe_plural(current.get("genre")),
+		artist=current.get("artist"),
+		album=current.get("album"),
+		album_artist=current.get("albumartist"),
+		composer=current.get("composer"),
+		genre=current.get("genre"),
 		track=convert_if_exists(current.get("track"), int),
 		disc=convert_if_exists(current.get("disc"), int),
 		duration=float(status["duration"]),
--- a/src/mpd_now_playable/mpd/types.py
+++ b/src/mpd_now_playable/mpd/types.py
@ -1,7 +1,5 @@
 from typing import Literal, NotRequired, Protocol, TypedDict

-from ..tools.types import MaybePlural
-

 class MpdStateHandler(Protocol):
 	async def get_art(self, file: str) -> bytes | None: ...
@ -49,19 +47,19 @@ class StatusResponse(TypedDict):
 # tagged, since then it can pass more information on to Now Playing, but it
 # should work fine with completely untagged music too.
 class CurrentSongTags(TypedDict, total=False):
-	artist: MaybePlural[str]
-	albumartist: MaybePlural[str]
-	artistsort: MaybePlural[str]
-	albumartistsort: MaybePlural[str]
+	artist: str
+	albumartist: str
+	artistsort: str
+	albumartistsort: str
 	title: str
-	album: MaybePlural[str]
+	album: str
 	track: str
 	date: str
 	originaldate: str
-	composer: MaybePlural[str]
+	composer: str
 	disc: str
 	label: str
-	genre: MaybePlural[str]
+	genre: str
 	musicbrainz_albumid: str
 	musicbrainz_albumartistid: str
 	musicbrainz_releasetrackid: str
--- a/src/mpd_now_playable/song.py
+++ b/src/mpd_now_playable/song.py
@ -21,17 +21,18 @@ class Song:
 	musicbrainz_trackid: UUID | None
 	musicbrainz_releasetrackid: UUID | None
 	title: str | None
-	artist: list[str]
-	composer: list[str]
-	album: list[str]
-	album_artist: list[str]
+	artist: str | None
+	composer: str | None
+	album: str | None
+	album_artist: str | None
 	track: int | None
 	disc: int | None
-	genre: list[str]
+	genre: str | None
 	duration: float
 	elapsed: float
 	art: bytes | None = field(repr=lambda a: "<has art>" if a else "<no art>")


 class SongListener(Protocol):
-	def update(self, song: Song | None) -> None: ...
+	def update(self, song: Song | None) -> None:
+		...
--- a/src/mpd_now_playable/tools/types.py
+++ b/src/mpd_now_playable/tools/types.py
@ -1,51 +1,11 @@
-from collections.abc import Callable
-from typing import Any, TypeAlias, TypeVar
+from typing import Callable, TypeVar

-__all__ = (
-	"AnyExceptList",
-	"MaybePlural",
-	"convert_if_exists",
-	"un_maybe_plural",
-)
+__all__ = ("convert_if_exists",)

-# Accept as many types as possible that are not lists. Yes, having to identify
-# them manually like this is kind of a pain! TypeScript can express this
-# restriction using a conditional type, and with another conditional type it
-# can correctly type a version of un_maybe_plural that *does* accept lists, but
-# Python's type system isn't quite that bonkers powerful. Yet?
-AnyExceptList = (
-	int
-	| float
-	| complex
-	| bool
-	| str
-	| bytes
-	| set[Any]
-	| dict[Any, Any]
-	| tuple[Any, ...]
-	| Callable[[Any], Any]
-	| type
-)
+T = TypeVar("T")


-U = TypeVar("U")
-
-
-def convert_if_exists(value: str | None, converter: Callable[[str], U]) -> U | None:
+def convert_if_exists(value: str | None, converter: Callable[[str], T]) -> T | None:
 	if value is None:
 		return None
 	return converter(value)
-
-
-T = TypeVar("T", bound=AnyExceptList)
-MaybePlural: TypeAlias = list[T] | T
-
-
-def un_maybe_plural(value: MaybePlural[T] | None) -> list[T]:
-	match value:
-		case None:
-			return []
-		case list(values):
-			return values[:]
-		case item:
-			return [item]