waybar: Use myxer as a graphical audio mixer

hosts/miku.nix

@@ -6,7 +6,7 @@ in mkHost config {
   userName = "alexander";
   hostName = "miku";
   primaryInterface = "enp6s0";
-  overlays = [ "nur" "unstable" "simple" "custom" "emacs" ];
+  overlays = [ "nur" "unstable" "stable" "simple" "custom" "emacs" ];
   hardwareImports = [ "amdgpu" "amd" ];
   programImports = [
     "zsh" "git" "mpv" "tmux" "emacs" "firefox" "i18n" "gamemode" "gnome" #"gnome-terminal"
@@ -112,6 +112,17 @@ in mkHost config {
       gnome.gnome-keyring.enable = true;
     };
 
+    environment.sessionVariables = {
+      # sway
+      #"_JAVA_AWT_NONREPARENTING" = 1;
+
+      # Wayland
+      "QT_QPA_PLATFORM" = "wayland-egl";
+      "ECORE_EVAS_ENGINE" = "wayland-egl";
+      "ELM_ENGINE" = "wayland-egl";
+      "SDL_VIDEODRIVER" = "wayland";
+    };
+    
     # TODO: Move into modules
     systemd.user.services = {
       scream = {

modules/programs/waybar/default.nix

@@ -44,6 +44,9 @@
               on-click = "${pkgs.wlogout}/bin/wlogout";
               tooltip = "false";
             };
+            "pulseaudio" = {
+              on-click = "${pkgs.stable.myxer}/bin/myxer";
+            };
           };
         }
       ];

overlays/default.nix

@@ -16,6 +16,7 @@ in {
   });
   nur = import ./nur.nix pkgs;
   unstable = importWrapper ./unstable.nix;
+  stable = importWrapper ./stable.nix;
   custom = import ./custom.nix pkgs;
   simple = import ./simple.nix;
   surface = import ./surface.nix pkgs;

overlays/stable.nix

@@ -0,0 +1,21 @@
+# NOTE: pkgs is unused but there for consistency with nur.nix
+{
+  lib, ...
+}: final: prev:
+
+let
+  stableTarball =
+    fetchTarball
+      https://github.com/NixOS/nixpkgs/archive/nixos-21.05.tar.gz;
+in {
+  stable = import stableTarball {
+    # TODO
+    config = {
+      allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [
+        "firmwareLinuxNonfree" "microcodeAmd" "microcodeIntel"
+        "steam" "steam-original" "steam-runtime"
+        "discord"
+      ];
+    };
+  };
+}