xfce.xfce4-alsa-plugin: init at 0.4.0

Fixes #381435

pkgs/desktops/xfce/default.nix

@@ -111,6 +111,8 @@ makeScopeWithSplicing' {
 
       #### PANEL PLUGINS
 
+      xfce4-alsa-plugin = callPackage ./panel-plugins/xfce4-alsa-plugin { };
+
       xfce4-battery-plugin = callPackage ./panel-plugins/xfce4-battery-plugin { };
 
       xfce4-clipman-plugin = callPackage ./panel-plugins/xfce4-clipman-plugin { };

pkgs/desktops/xfce/panel-plugins/xfce4-alsa-plugin/default.nix

@@ -0,0 +1,51 @@
+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  meson,
+  vala,
+  pkg-config,
+  gettext,
+  ninja,
+  alsa-lib,
+  xfce4-panel,
+  nix-update-script,
+}:
+
+stdenv.mkDerivation (finalAttrs: {
+  pname = "xfce4-alsa-plugin";
+  version = "0.4.0";
+
+  src = fetchFromGitHub {
+    owner = "equeim";
+    repo = "xfce4-alsa-plugin";
+    tag = finalAttrs.version;
+    hash = "sha256-95uVHDyXji8dut7qfE5V/uBBt6DPYF/YfudHe7HJcE8=";
+  };
+
+  strictDeps = true;
+
+  nativeBuildInputs = [
+    meson
+    vala
+    pkg-config
+    gettext
+    ninja
+  ];
+
+  buildInputs = [
+    alsa-lib
+    xfce4-panel
+  ];
+
+  passthru.updateScript = nix-update-script { };
+
+  meta = {
+    homepage = "https://github.com/equeim/xfce4-alsa-plugin";
+    description = "Simple ALSA volume control for xfce4-panel";
+    license = lib.licenses.gpl3Plus;
+    platforms = lib.platforms.linux;
+    maintainers = with lib.maintainers; [ ProxyVT ];
+    teams = [ lib.teams.xfce ];
+  };
+})