Check for new songs

DeltatuneWls/Program.cs

@@ -1,4 +1,5 @@
 using Gio;
+using GLib;
 using Gtk;
 using ZwlrLayerShell;
 using Application = Gtk.Application;
@@ -9,11 +10,31 @@ if (!LayerShell.IsSupported())
     return 255;
 }
 
+ApplicationWindow? window = null;
+
 var application = Application.New("gay.pancakes.deltatune_wls", Gio.ApplicationFlags.FlagsNone);
 
+GLib.Functions.TimeoutAdd(GLib.Constants.PRIORITY_DEFAULT, 500, () =>
+{
+    if (window == null) return true;
+    
+    var playerctl = Subprocess.New(["playerctl", "metadata", "--format", "{{ title }}"],
+        SubprocessFlags.StdoutPipe | SubprocessFlags.StderrSilence);
+
+    var pipe = playerctl.GetStdoutPipe();
+    if (pipe == null) return true;
+
+    var stdout = DataInputStream.New(pipe);
+    var line   = stdout.ReadLineUtf8(out UIntPtr length, null);
+
+    window.ActivateAction("new_song", Variant.NewString(line?.Trim() ?? ""));
+
+    return true;
+});
+
 application.OnActivate += (sender, eventArgs) =>
 {
-    var window = ApplicationWindow.New((Application)sender);
+    window = ApplicationWindow.New((Application)sender);
 
     LayerShell.InitForWindow(window);
     LayerShell.SetNamespace(window, "deltatune-wls");
@@ -22,6 +43,27 @@ application.OnActivate += (sender, eventArgs) =>
     LayerShell.SetAnchor(window, Edge.Top, true);
     LayerShell.SetMargin(window, 15);
 
+    var label = Label.New(null);
+    label.Halign = Align.Start;
+
+    window.SetChild(label);
+
+    window.OnDestroy += (widget, args1) => application.Quit();
+
+    var action = SimpleAction.NewStateful("new_song", VariantType.String, Variant.NewString(""));
+    action.OnActivate += (simpleAction, signalArgs) =>
+    {
+        var title    = simpleAction.GetState()!.GetString(out _);
+        var newTitle = signalArgs.Parameter!.GetString(out _);
+
+        if (newTitle != title)
+        {
+            simpleAction.SetState(signalArgs.Parameter);
+            label.SetLabel($"♪ - {newTitle}");
+        }
+    };
+    window.AddAction(action);
+
     window.Present();
 };