add button to Advanced settings tab to clear caches

backend/app.go

@@ -32,6 +32,7 @@ const (
 	portableDir      = "supersonic_portable"
 	savedQueueFile   = "saved_queue.json"
 	themesDir        = "themes"
+	audioCacheSubdir = "audio"
 )
 
 var (
@@ -146,7 +147,7 @@ func StartupApp(appName, displayAppName, appVersion, appVersionTag, latestReleas
 	a.ServerManager = NewServerManager(appName, appVersion, a.Config, !portableMode && a.Config.Application.EnablePasswordStorage)
 	a.ImageManager = NewImageManager(a.bgrndCtx, a.ServerManager, cacheDir)
 	if a.Config.Playback.UseWaveformSeekbar {
-		ac, err := NewAudioCache(a.bgrndCtx, a.ServerManager, filepath.Join(cacheDir, "audio"))
+		ac, err := NewAudioCache(a.bgrndCtx, a.ServerManager, filepath.Join(cacheDir, audioCacheSubdir))
 		if err != nil {
 			log.Printf("failed to create audio cache: %s", err.Error())
 		}
@@ -247,6 +248,21 @@ func (a *App) ThemesDir() string {
 	return filepath.Join(a.configDir, themesDir)
 }
 
+func (a *App) ClearCaches() {
+	if a.cacheDir != "" {
+		entries, _ := os.ReadDir(a.cacheDir)
+		for _, e := range entries {
+			// The audio cache directory is necessary for
+			// proper playback of enqueued tracks, and also
+			// doesn't accumulate more than a few entries.
+			// Leave it alone.
+			if e.Name() != audioCacheSubdir {
+				_ = os.RemoveAll(filepath.Join(a.cacheDir, e.Name()))
+			}
+		}
+	}
+}
+
 func checkPortablePath() string {
 	if p, err := os.Executable(); err == nil {
 		pdirPath := path.Join(filepath.Dir(p), portableDir)

res/translations/en.json

@@ -47,6 +47,7 @@
     "Cast to device": "Cast to device",
     "Channels": "Channels",
     "Check for Updates": "Check for Updates",
+    "Clear caches": "Clear caches",
     "Close": "Close",
     "Close to system tray": "Close to system tray",
     "Comment": "Comment",

res/translations/es.json

@@ -35,6 +35,7 @@
     "Broadcast": "Transmisión",
     "Cancel": "Cancelar",
     "Check for Updates": "Buscar actualizaciones",
+    "Clear caches": "Borrar cachés",
     "Close": "Cerrar",
     "Close to system tray": "Cerrar a la bandeja del sistema",
     "Comment": "Comentario",

res/translations/fr.json

@@ -47,6 +47,7 @@
     "Cast to device": "Diffuser sur un appareil",
     "Channels": "Canaux",
     "Check for Updates": "Vérifier les mises à jour",
+    "Clear caches": "Vider les caches",
     "Close": "Fermer",
     "Close to system tray": "Réduire dans la barre d'état à la fermeture",
     "Comment": "Commentaire",

ui/controller/controller.go

@@ -347,6 +347,7 @@ func (c *Controller) ShowSettingsDialog(themeUpdateCallbk func(), themeFiles map
 		c.App.LocalPlayer.SetEqualizer(eq)
 	}
 	dlg.OnPageNeedsRefresh = c.RefreshPageFunc
+	dlg.OnClearCaches = func() { go c.App.ClearCaches() }
 	pop := widget.NewModalPopUp(dlg, c.MainWindow.Canvas())
 	fynetooltip.AddPopUpToolTipLayer(pop)
 	dlg.OnDismiss = func() {

ui/dialogs/settingsdialog.go

@@ -38,6 +38,7 @@ type SettingsDialog struct {
 	OnDismiss                      func()
 	OnEqualizerSettingsChanged     func()
 	OnPageNeedsRefresh             func()
+	OnClearCaches                  func()
 
 	config       *backend.Config
 	audioDevices []mpv.AudioDevice
@@ -610,10 +611,18 @@ func (s *SettingsDialog) createAdvancedTab() *container.TabItem {
 	}
 	percentEntry.Text = strconv.Itoa(s.config.Application.MaxImageCacheSizeMB)
 
+	clearCaches := widget.NewButton(lang.L("Clear caches"), func() {
+		if s.OnClearCaches != nil {
+			s.OnClearCaches()
+		}
+	})
+
 	imgCacheCfg := container.NewHBox(
 		widget.NewLabel(lang.L("Maximum image cache size")),
 		percentEntry,
 		widget.NewLabel("MB"),
+		layout.NewSpacer(),
+		clearCaches,
 	)
 
 	osMediaAPIs := widget.NewCheck(lang.L("Enable OS media player integration"), func(b bool) {