feat: Add Song radio option in tracklist.

At this moment this feature is only available on the Subsonic media provider. Using a
Jellyfin server the "Play song radio" option will be disabled.

backend/mediaprovider/mediaprovider.go

@@ -200,6 +200,10 @@ type SupportsSharing interface {
 	CanShareArtists() bool
 }
 
+type SupportsSongRadio interface {
+	GetSongRadio(trackID string, count int) ([]*Track, error)
+}
+
 type LyricsProvider interface {
 	GetLyrics(track *Track) (*Lyrics, error)
 }

backend/mediaprovider/subsonic/subsonicmediaprovider.go

@@ -543,3 +543,11 @@ func fillPlaylist(pl *subsonic.Playlist, playlist *mediaprovider.Playlist) {
 	playlist.TrackCount = pl.SongCount
 	playlist.Duration = pl.Duration
 }
+
+func (s *subsonicMediaProvider) GetSongRadio(trackID string, count int) ([]*mediaprovider.Track, error) {
+	tr, err := s.client.GetSimilarSongs(trackID, map[string]string{"count": strconv.Itoa(count)})
+	if err != nil {
+		return nil, err
+	}
+	return sharedutil.MapSlice(tr, toTrack), nil
+}

res/bundled_gen.sh

@@ -15,6 +15,7 @@ fyne bundle -append -prefix Res icons/publicdomain/theatermasks.svg >> bundled.g
 fyne bundle -append -prefix Res icons/publicdomain/grid.svg >> bundled.go
 fyne bundle -append -prefix Res icons/publicdomain/list.svg >> bundled.go
 fyne bundle -append -prefix Res icons/publicdomain/filter.svg >> bundled.go
+fyne bundle -append -prefix Res icons/remix_design/broadcast.svg >> bundled.go
 fyne bundle -append -prefix Res icons/remix_design/repeat.svg >> bundled.go
 fyne bundle -append -prefix Res icons/remix_design/repeatone.svg >> bundled.go
 fyne bundle -append -prefix Res icons/remix_design/shuffle.svg >> bundled.go

ui/browsing/albumpage.go

@@ -95,8 +95,10 @@ func newAlbumPage(
 	a.tracklist.SetSorting(sort)
 	_, canRate := a.mp.(mediaprovider.SupportsRating)
 	_, canShare := a.mp.(mediaprovider.SupportsSharing)
+	_, canSongRadio := a.mp.(mediaprovider.SupportsSongRadio)
 	a.tracklist.Options.DisableRating = !canRate
 	a.tracklist.Options.DisableSharing = !canShare
+	a.tracklist.Options.DisableSongRadio = !canSongRadio
 	a.tracklist.OnVisibleColumnsChanged = func(cols []string) {
 		a.cfg.TracklistColumns = cols
 	}

ui/browsing/artistpage.go

@@ -238,8 +238,10 @@ func (a *ArtistPage) showTopTracks() {
 		tl.Options = widgets.TracklistOptions{AutoNumber: true}
 		_, canRate := a.mp.(mediaprovider.SupportsRating)
 		_, canShare := a.mp.(mediaprovider.SupportsSharing)
+		_, canSongRadio := a.mp.(mediaprovider.SupportsSongRadio)
 		tl.Options.DisableRating = !canRate
 		tl.Options.DisableSharing = !canShare
+		tl.Options.DisableSongRadio = !canSongRadio
 		tl.SetVisibleColumns(a.cfg.TracklistColumns)
 		tl.SetSorting(a.trackSort)
 		tl.OnVisibleColumnsChanged = func(cols []string) {

ui/browsing/favoritespage.go

@@ -403,8 +403,10 @@ func (a *FavoritesPage) onShowFavoriteSongs() {
 			tracklist.Options = widgets.TracklistOptions{AutoNumber: true}
 			_, canRate := a.mp.(mediaprovider.SupportsRating)
 			_, canShare := a.mp.(mediaprovider.SupportsSharing)
+			_, canSongRadio := a.mp.(mediaprovider.SupportsSongRadio)
 			tracklist.Options.DisableRating = !canRate
 			tracklist.Options.DisableSharing = !canShare
+			tracklist.Options.DisableSongRadio = !canSongRadio
 			tracklist.SetVisibleColumns(a.cfg.TracklistColumns)
 			tracklist.SetSorting(a.trackSort)
 			tracklist.OnVisibleColumnsChanged = func(cols []string) {

ui/browsing/playlistpage.go

@@ -88,11 +88,13 @@ func newPlaylistPage(
 	}
 	_, canRate := a.sm.Server.(mediaprovider.SupportsRating)
 	_, canShare := a.sm.Server.(mediaprovider.SupportsSharing)
+	_, canSongRadio := a.sm.Server.(mediaprovider.SupportsSongRadio)
 	remove := fyne.NewMenuItem("Remove from playlist", a.onRemoveSelectedFromPlaylist)
 	remove.Icon = theme.ContentClearIcon()
 	a.tracklist.Options = widgets.TracklistOptions{
 		DisableRating:  !canRate,
 		DisableSharing: !canShare,
+		DisableSongRadio: !canSongRadio,
 		AuxiliaryMenuItems: []*fyne.MenuItem{
 			util.NewReorderTracksSubmenu(a.doSetNewTrackOrder),
 			remove,

ui/browsing/trackspage.go

@@ -41,6 +41,7 @@ type tracksPageState struct {
 	mp         mediaprovider.MediaProvider
 	canRate    bool
 	canShare   bool
+	canSongRadio bool
 }
 
 func NewTracksPage(contr *controller.Controller, conf *backend.TracksPageConfig, pool *util.WidgetPool, mp mediaprovider.MediaProvider) *TracksPage {
@@ -50,10 +51,12 @@ func NewTracksPage(contr *controller.Controller, conf *backend.TracksPageConfig,
 	t.tracklist = t.obtainTracklist()
 	_, t.canRate = mp.(mediaprovider.SupportsRating)
 	_, t.canShare = mp.(mediaprovider.SupportsSharing)
+	_, t.canSongRadio = mp.(mediaprovider.SupportsSongRadio)
 	t.tracklist.Options = widgets.TracklistOptions{
 		DisableSorting: true,
 		DisableRating:  !t.canRate,
 		DisableSharing: !t.canShare,
+		DisableSongRadio: !t.canSongRadio,
 		AutoNumber:     true,
 	}
 	t.tracklist.SetVisibleColumns(conf.TracklistColumns)
@@ -141,6 +144,7 @@ func (t *TracksPage) doSearch(query string) {
 			DisableSorting: true,
 			DisableRating:  !t.canRate,
 			DisableSharing: !t.canShare,
+			DisableSongRadio: !t.canSongRadio,
 		}
 		t.searchTracklist.SetVisibleColumns(t.conf.TracklistColumns)
 		t.searchTracklist.SetNowPlaying(t.nowPlayingID)

ui/controller/controller.go

@@ -145,6 +145,20 @@ func (m *Controller) connectTracklistActionsWithReplayGainMode(tracklist *widget
 	tracklist.OnShare = func(trackID string) {
 		go m.ShowShareDialog(trackID)
 	}
+	tracklist.OnPlaySongRadio = func (track *mediaprovider.Track) {
+		go func() {
+			tracks, err := m.GetSongRadioTracks(track)
+			if err != nil {
+				log.Printf("Error getting song radio: ", err)
+				return 
+			}
+			m.App.PlaybackManager.LoadTracks(tracks, false, false)
+			if m.App.Config.ReplayGain.Mode == backend.ReplayGainAuto {
+				m.App.PlaybackManager.SetReplayGainMode(mode)
+			}
+			m.App.PlaybackManager.PlayFromBeginning()
+		}()
+	}
 }
 
 func (m *Controller) ConnectAlbumGridActions(grid *widgets.GridView) {
@@ -868,3 +882,23 @@ func (c *Controller) ShowAlbumInfoDialog(albumID, albumName string, albumCover i
 		pop.Show()
 	}()
 }
+
+func (c *Controller) GetSongRadioTracks(sourceTrack *mediaprovider.Track) ([]*mediaprovider.Track, error) {
+	r, ok := c.App.ServerManager.Server.(mediaprovider.SupportsSongRadio)
+	if !ok {
+		return nil, fmt.Errorf("Server does not support song radio")
+	}
+
+	radioTracks, err := r.GetSongRadio(sourceTrack.ID, 100)
+	if err != nil {
+		return nil, fmt.Errorf("Error getting song radio: ", err)
+	}
+
+	// The goal of this implementation is to place the source track first in the queue.
+	filteredTracks := sharedutil.FilterSlice(radioTracks, func(track *mediaprovider.Track) bool{
+		return track.ID != sourceTrack.ID
+	})
+	tracks := []*mediaprovider.Track{sourceTrack}
+	tracks = append(tracks, filteredTracks...)
+	return tracks, nil
+}

ui/theme/theme.go

@@ -27,6 +27,7 @@ const (
 var (
 	AlbumIcon       fyne.Resource = theme.NewThemedResource(res.ResDiscSvg)
 	ArtistIcon      fyne.Resource = theme.NewThemedResource(res.ResPeopleSvg)
+	BroadcastIcon   fyne.Resource = theme.NewThemedResource(res.ResBroadcastSvg)
 	FavoriteIcon    fyne.Resource = theme.NewThemedResource(res.ResHeartFilledSvg)
 	NotFavoriteIcon fyne.Resource = theme.NewThemedResource(res.ResHeartOutlineSvg)
 	NowPlayingIcon  fyne.Resource = theme.NewThemedResource(res.ResHeadphonesSvg)

ui/widgets/tracklist.go

@@ -76,6 +76,9 @@ type TracklistOptions struct {
 
 	// Disables the sharing option.
 	DisableSharing bool
+
+	// Disables the song radio option.
+	DisableSongRadio bool
 }
 
 type Tracklist struct {
@@ -92,6 +95,7 @@ type Tracklist struct {
 	OnSetRating     func(trackIDs []string, rating int)
 	OnDownload      func(tracks []*mediaprovider.Track, downloadName string)
 	OnShare         func(trackID string)
+	OnPlaySongRadio func(track *mediaprovider.Track)
 
 	OnShowArtistPage func(artistID string)
 	OnShowAlbumPage  func(albumID string)
@@ -114,6 +118,7 @@ type Tracklist struct {
 	ctxMenu       *fyne.Menu
 	ratingSubmenu *fyne.MenuItem
 	shareMenuItem *fyne.MenuItem
+	songRadioMenuItem *fyne.MenuItem
 	container     *fyne.Container
 }
 
@@ -539,8 +544,12 @@ func (t *Tracklist) onShowContextMenu(e *fyne.PointEvent, trackIdx int) {
 				}
 			})
 			add.Icon = theme.ContentAddIcon()
+			t.songRadioMenuItem = fyne.NewMenuItem("Play song radio", func() {
+				t.onPlaySongRadio(t.selectedTracks())
+			})
+			t.songRadioMenuItem.Icon = myTheme.BroadcastIcon
 			t.ctxMenu.Items = append(t.ctxMenu.Items,
-				play, shuffle, add)
+				play, shuffle, add, t.songRadioMenuItem)
 		}
 		playlist := fyne.NewMenuItem("Add to playlist...", func() {
 			if t.OnAddToPlaylist != nil {
@@ -579,6 +588,7 @@ func (t *Tracklist) onShowContextMenu(e *fyne.PointEvent, trackIdx int) {
 	}
 	t.ratingSubmenu.Disabled = t.Options.DisableRating
 	t.shareMenuItem.Disabled = t.Options.DisableSharing || len(t.selectedTracks()) != 1
+	t.songRadioMenuItem.Disabled = t.Options.DisableSongRadio || len(t.selectedTracks()) != 1
 	widget.ShowPopUpMenuAtPosition(t.ctxMenu, fyne.CurrentApp().Driver().CanvasForObject(t), e.AbsolutePosition)
 }
 
@@ -649,6 +659,14 @@ func (t *Tracklist) onShare(tracks []*mediaprovider.Track) {
 	}
 }
 
+func (t *Tracklist) onPlaySongRadio(tracks []*mediaprovider.Track) {
+	if t.OnPlaySongRadio != nil {
+		if len(tracks) > 0 {
+			t.OnPlaySongRadio(tracks[0])
+		}
+	}
+}
+
 func (t *Tracklist) selectedTracks() []*mediaprovider.Track {
 	t.tracksMutex.RLock()
 	defer t.tracksMutex.RUnlock()