play the songs list from the songs tab

app/src/main/kotlin/com/subtracks/data/db/LibraryDao.kt

@@ -21,6 +21,13 @@ internal const val PLAYLIST_SONGS_SQL =
         "WHERE playlist_songs.sourceId = :sourceId AND playlist_songs.playlistId = :playlistId " +
         "ORDER BY playlist_songs.position"
 
+internal const val SONGS_SQL =
+    "SELECT songs.*, albums.coverArt AS coverArt FROM songs " +
+        "LEFT JOIN albums ON albums.sourceId = songs.sourceId AND albums.id = songs.albumId " +
+        "WHERE songs.sourceId = :sourceId " +
+        "ORDER BY albums.albumArtist COLLATE NOCASE, songs.album COLLATE NOCASE, songs.disc, songs.track, " +
+        "songs.title COLLATE NOCASE, songs.id"
+
 @Dao
 @DaoReturnTypeConverters(PagingSourceDaoReturnTypeConverter::class)
 interface LibraryDao {
@@ -93,12 +100,7 @@ interface LibraryDao {
     @Query("SELECT * FROM albums WHERE sourceId = :sourceId ORDER BY created DESC, name COLLATE NOCASE")
     fun albumsByRecentlyAdded(sourceId: Long): PagingSource<Int, Album>
 
-    @Query(
-        "SELECT songs.*, albums.coverArt AS coverArt FROM songs " +
-            "LEFT JOIN albums ON albums.sourceId = songs.sourceId AND albums.id = songs.albumId " +
-            "WHERE songs.sourceId = :sourceId " +
-            "ORDER BY songs.title COLLATE NOCASE, songs.artist COLLATE NOCASE",
-    )
+    @Query(SONGS_SQL)
     fun songs(sourceId: Long): PagingSource<Int, SongListItem>
 
     @Query("SELECT * FROM playlists WHERE sourceId = :sourceId ORDER BY name COLLATE NOCASE")

app/src/main/kotlin/com/subtracks/data/db/QueueDao.kt

@@ -47,6 +47,9 @@ interface QueueDao {
         albumId: String,
     ): Long
 
+    @Query("SELECT COUNT(*) FROM songs WHERE sourceId = :sourceId")
+    suspend fun songsLength(sourceId: Long): Long
+
     @Query("SELECT COUNT(*) FROM songs WHERE sourceId = :sourceId AND id = :songId")
     suspend fun songLength(
         sourceId: Long,
@@ -67,6 +70,12 @@ interface QueueDao {
         offset: Long,
     ): SongListItem?
 
+    @Query("$SONGS_SQL LIMIT 1 OFFSET :offset")
+    suspend fun songAt(
+        sourceId: Long,
+        offset: Long,
+    ): SongListItem?
+
     @Query(
         "SELECT songs.*, albums.coverArt AS coverArt FROM songs " +
             "LEFT JOIN albums ON albums.sourceId = songs.sourceId AND albums.id = songs.albumId " +

app/src/main/kotlin/com/subtracks/data/model/Models.kt

@@ -175,7 +175,7 @@ data class SearchIndex(
     val title: String,
 )
 
-enum class QueueKind { Playlist, Album, Song }
+enum class QueueKind { Playlist, Album, Song, Songs }
 
 @Entity(
     tableName = "queue_entries",

app/src/main/kotlin/com/subtracks/data/repo/QueueRepository.kt

@@ -53,6 +53,8 @@ class QueueRepository(
         songId: String,
     ) = QueueEntry(position = 0, sourceId = sourceId, kind = QueueKind.Song, refId = songId)
 
+    fun songsEntry(sourceId: Long) = QueueEntry(position = 0, sourceId = sourceId, kind = QueueKind.Songs, refId = "")
+
     suspend fun replace(entries: List<QueueEntry>) {
         db.useWriterConnection { transactor ->
             transactor.immediateTransaction {
@@ -99,6 +101,7 @@ class QueueRepository(
             QueueKind.Playlist -> dao.playlistSongAt(entry.sourceId, entry.refId, index)
             QueueKind.Album -> dao.albumSongAt(entry.sourceId, entry.refId, index)
             QueueKind.Song -> if (offset == 0L) dao.song(entry.sourceId, entry.refId) else null
+            QueueKind.Songs -> dao.songAt(entry.sourceId, index)
         }
     }
 
@@ -108,6 +111,7 @@ class QueueRepository(
                 QueueKind.Song -> dao.songLength(sourceId, refId)
                 QueueKind.Playlist -> dao.playlistLength(sourceId, refId)
                 QueueKind.Album -> dao.albumLength(sourceId, refId)
+                QueueKind.Songs -> dao.songsLength(sourceId)
             }
         val available = (total - offset).coerceAtLeast(0)
         return count?.coerceAtMost(available) ?: available

app/src/main/kotlin/com/subtracks/di/AppModule.kt

@@ -34,7 +34,7 @@ fun appModule(
     single<PlayerConnection> { MediaSessionConnection(context.applicationContext, get()) }
     single { PlaybackController(get(), get(), get()) }
     viewModel { RootViewModel(get()) }
-    viewModel { LibraryViewModel(get(), get(), get(), get()) }
+    viewModel { LibraryViewModel(get(), get(), get(), get(), get()) }
     viewModel { SettingsViewModel(get(), get()) }
     viewModel { AddSourceViewModel(get(), get()) }
     viewModel { params -> AlbumDetailViewModel(get(), get(), get(), params.get()) }

app/src/main/kotlin/com/subtracks/playback/PlaybackController.kt

@@ -118,6 +118,11 @@ class PlaybackController(
         startPosition: Long,
     ) = play(listOf(queueRepository.playlistEntry(sourceId, playlistId)), startPosition)
 
+    fun playSongs(
+        sourceId: Long,
+        startPosition: Long,
+    ) = play(listOf(queueRepository.songsEntry(sourceId)), startPosition)
+
     fun togglePlayPause() {
         val player = player ?: return
         if (player.isEnded) {

app/src/main/kotlin/com/subtracks/ui/library/LibraryScreen.kt

@@ -93,6 +93,7 @@ fun LibraryRoute(
 ) {
     var selectedTab by rememberSaveable { mutableStateOf(LibraryTab.Albums) }
     val syncing by viewModel.syncing.collectAsStateWithLifecycle()
+    val playingSongId by viewModel.playingSongId.collectAsStateWithLifecycle()
     LibraryScreen(
         selectedTab = selectedTab,
         onTabSelected = { selectedTab = it },
@@ -105,8 +106,10 @@ fun LibraryRoute(
         coverArt = viewModel::coverArt,
         onAlbumClick = onAlbumClick,
         onPlaylistClick = onPlaylistClick,
+        onSongClick = viewModel::playSong,
         onSync = viewModel::sync,
         onOpenSettings = onOpenSettings,
+        playingSongId = playingSongId,
     )
 }
 
@@ -122,9 +125,11 @@ fun LibraryScreen(
     coverArt: (String?, Boolean) -> CoverArtRef?,
     onAlbumClick: (Album) -> Unit,
     onPlaylistClick: (Playlist) -> Unit,
+    onSongClick: (Int) -> Unit,
     onSync: () -> Unit,
     onOpenSettings: () -> Unit,
     syncing: Boolean = false,
+    playingSongId: String? = null,
     bottomInset: Dp = 0.dp,
     modifier: Modifier = Modifier,
 ) {
@@ -206,7 +211,7 @@ fun LibraryScreen(
             when (LibraryTab.entries[page]) {
                 LibraryTab.Albums -> AlbumsContent(albums, coverArt, bottomInset, onAlbumClick)
                 LibraryTab.Artists -> ArtistsContent(artists, coverArt, bottomInset)
-                LibraryTab.Songs -> SongsContent(songs, coverArt, bottomInset)
+                LibraryTab.Songs -> SongsContent(songs, coverArt, bottomInset, onSongClick, playingSongId)
                 LibraryTab.Playlists -> PlaylistsContent(playlists, coverArt, bottomInset, onPlaylistClick)
             }
         }

app/src/main/kotlin/com/subtracks/ui/library/LibraryViewModel.kt

@@ -8,12 +8,14 @@ import com.subtracks.data.model.Album
 import com.subtracks.data.model.Artist
 import com.subtracks.data.model.CoverArtRef
 import com.subtracks.data.model.Playlist
+import com.subtracks.data.model.QueueKind
 import com.subtracks.data.model.SongListItem
 import com.subtracks.data.prefs.UserPreferences
 import com.subtracks.data.repo.LibraryRepository
 import com.subtracks.data.repo.SourceRepository
 import com.subtracks.data.sync.SyncManager
 import com.subtracks.data.sync.SyncStatus
+import com.subtracks.playback.PlaybackController
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.SharingStarted
@@ -22,12 +24,14 @@ import kotlinx.coroutines.flow.filterNotNull
 import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.launch
 
 @OptIn(ExperimentalCoroutinesApi::class)
 class LibraryViewModel(
     private val libraryRepository: LibraryRepository,
     private val sourceRepository: SourceRepository,
     private val syncManager: SyncManager,
+    private val playbackController: PlaybackController,
     userPreferences: UserPreferences,
 ) : ViewModel() {
     val albums: Flow<PagingData<Album>> =
@@ -60,10 +64,22 @@ class LibraryViewModel(
             .map { it == SyncStatus.Running }
             .stateIn(viewModelScope, SharingStarted.WhileSubscribed(5_000), false)
 
+    val playingSongId: StateFlow<String?> =
+        playbackController.state
+            .map { state -> state.item?.id?.takeIf { state.context?.kind == QueueKind.Songs } }
+            .stateIn(viewModelScope, SharingStarted.WhileSubscribed(5_000), null)
+
     fun coverArt(
         coverArt: String?,
         thumbnail: Boolean,
     ): CoverArtRef? = sourceRepository.coverArt(coverArt, thumbnail)
 
+    fun playSong(position: Int) {
+        viewModelScope.launch {
+            val sourceId = sourceRepository.activeSourceIdOnce() ?: return@launch
+            playbackController.playSongs(sourceId, position.toLong())
+        }
+    }
+
     fun sync() = syncManager.requestSync()
 }

app/src/main/kotlin/com/subtracks/ui/library/SongsContent.kt

@@ -1,5 +1,6 @@
 package com.subtracks.ui.library
 
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
@@ -36,6 +37,8 @@ fun SongsContent(
     items: LazyPagingItems<SongListItem>,
     coverArt: (String?, Boolean) -> CoverArtRef?,
     bottomInset: Dp,
+    onSongClick: (Int) -> Unit,
+    playingSongId: String? = null,
     modifier: Modifier = Modifier,
 ) {
     when {
@@ -55,7 +58,13 @@ fun SongsContent(
                 items(count = items.itemCount, key = items.itemKey { it.song.id }) { index ->
                     val item = items[index]
                     if (item != null) {
-                        SongRow(song = item.song, coverArtId = item.coverArt, coverArt = coverArt)
+                        SongRow(
+                            song = item.song,
+                            coverArtId = item.coverArt,
+                            coverArt = coverArt,
+                            isPlaying = item.song.id == playingSongId,
+                            modifier = Modifier.clickable { onSongClick(index) },
+                        )
                     }
                 }
             }

app/src/test/kotlin/com/subtracks/data/repo/QueueRepositoryTest.kt

@@ -6,6 +6,7 @@ import androidx.sqlite.driver.bundled.BundledSQLiteDriver
 import androidx.test.core.app.ApplicationProvider
 import androidx.test.ext.junit.runners.AndroidJUnit4
 import com.subtracks.data.db.SubtracksDatabase
+import com.subtracks.data.model.Album
 import com.subtracks.data.model.PlaylistSong
 import com.subtracks.data.model.QueueEntry
 import com.subtracks.data.model.QueueKind
@@ -70,6 +71,19 @@ class QueueRepositoryTest {
             assertEquals(listOf("s2", "s3"), resolveAll(snapshot))
         }
 
+    @Test
+    fun theSongsEntryResolvesTheWholeLibraryInListOrder() =
+        runTest {
+            seedLibrary()
+            db.libraryDao().upsertAlbums(listOf(album("al0", "Zeroth Album", "Aardvark")))
+            db.libraryDao().upsertSongs(listOf(song("s0", "al0", track = 1, album = "Zeroth Album")))
+
+            val snapshot = repository.snapshotAfter(listOf(repository.songsEntry(1)))
+
+            assertEquals(6, snapshot.size)
+            assertEquals(listOf("s0", "s1", "s2", "s3", "s4", "s5"), resolveAll(snapshot))
+        }
+
     @Test
     fun windowSpansEntryBoundaries() =
         runTest {
@@ -226,28 +240,55 @@ class QueueRepositoryTest {
         db.sourcesDao().upsertSource(
             Source(id = 1, name = "test", address = "http://localhost", isActive = true, createdAt = 0),
         )
+        db.libraryDao().upsertAlbums(
+            listOf(
+                album("al1", "First Album", "Artist One"),
+                album("al2", "Second Album", "Artist Two"),
+            ),
+        )
         db.libraryDao().upsertSongs(
             listOf(
-                song("s1", "al1", track = 1),
-                song("s2", "al1", track = 2),
-                song("s3", "al1", track = 3),
-                song("s4", "al2", track = 1),
-                song("s5", "al2", track = 2),
+                song("s1", "al1", track = 1, album = "First Album"),
+                song("s2", "al1", track = 2, album = "First Album"),
+                song("s3", "al1", track = 3, album = "First Album"),
+                song("s4", "al2", track = 1, album = "Second Album"),
+                song("s5", "al2", track = 2, album = "Second Album"),
             ),
         )
     }
 
+    private fun album(
+        id: String,
+        name: String,
+        albumArtist: String,
+    ) = Album(
+        sourceId = 1,
+        id = id,
+        artistId = "ar1",
+        name = name,
+        albumArtist = albumArtist,
+        created = 0,
+        coverArt = null,
+        genre = null,
+        year = null,
+        starred = null,
+        songCount = 1,
+        frequentRank = null,
+        recentRank = null,
+    )
+
     private fun song(
         id: String,
         albumId: String,
         track: Long,
+        album: String = "Album",
     ) = Song(
         sourceId = 1,
         id = id,
         albumId = albumId,
         artistId = "ar1",
         title = "Song $id",
-        album = "Album",
+        album = album,
         artist = "Artist",
         duration = 100,
         track = track,

app/src/test/kotlin/com/subtracks/playback/PlaybackControllerTest.kt

@@ -70,6 +70,19 @@ class PlaybackControllerTest {
         assertEquals(listOf("prepare", "play"), handle.operations.takeLast(2))
     }
 
+    @Test
+    fun playingTheSongsListQueuesTheWholeLibrary() {
+        seedAlbum(60, sourceId = 1)
+
+        controller.playSongs(1, 30)
+        await { handle.operations.contains("play") }
+
+        assertEquals(51, handle.itemCount)
+        assertEquals(QueueContext(QueueKind.Songs, ""), controller.state.value.context)
+        assertTrue(controller.state.value.hasNext)
+        assertTrue(controller.state.value.hasPrevious)
+    }
+
     @Test
     fun advancingShiftsTheWindowAndKeepsItBounded() {
         seedAlbum(100, sourceId = 1)

app/src/test/kotlin/com/subtracks/ui/AppScreenshotTest.kt

@@ -248,6 +248,7 @@ class AppScreenshotTest {
                     coverArt = { id, _ -> id?.let { CoverArtRef(it, "test:$it") } },
                     onAlbumClick = {},
                     onPlaylistClick = {},
+                    onSongClick = {},
                     onSync = {},
                     onOpenSettings = {},
                 )

app/src/test/kotlin/com/subtracks/ui/LibraryScreenTest.kt

@@ -50,6 +50,7 @@ class LibraryScreenTest {
                     coverArt = { _, _ -> null },
                     onAlbumClick = {},
                     onPlaylistClick = {},
+                    onSongClick = {},
                     onSync = {},
                     onOpenSettings = {},
                 )

docs/implementation-plan.md

@@ -34,7 +34,8 @@ Not done yet in this slice (deliberately): artist detail, cover-art tonal colour
 - (done) Media notifications and headset/Bluetooth controls, from the media session.
 - (done) A SQL-backed queue of references (whole playlist / album / song, each with an optional ordinal range) resolved lazily, with only a bounded window in memory and in the player.
 - (done) Streaming bitrate and preferred format from settings (`maxBitRate`/`format`, so the server transcodes as configured).
-- Playing from the Songs tab, the queue view (add to queue / play next / reorder), and gapless format preferences.
+- (done) Playing from the Songs tab: the tapped song queues the whole songs list at that position.
+- The queue view (add to queue / play next / reorder), and gapless format preferences.
 - Scrobbling and "now playing" back to the server.
 - Optional download/caching.