configs/nixos/modules/desktop/utilities/audio.nix

@@ -7,6 +7,15 @@
 }:
 # PipeWire as the desktop audio server.
 let
+  volumeKey = keys: command: {
+    inherit keys;
+    repeating = true;
+    action = {
+      kind = "exec";
+      command = "${lib.getExe' pkgs.swayosd "swayosd-client"} --output-volume ${command}";
+    };
+  };
+
   mediaKey = keys: command: {
     inherit keys;
     locked = true;
@@ -30,6 +39,17 @@ in
     };
 
     registry.keybind.${config.networking.hostName} = {
+      volume-up = volumeKey "XF86AudioRaiseVolume" "raise --max-volume 100";
+      volume-down = volumeKey "XF86AudioLowerVolume" "lower";
+      mute = {
+        keys = "XF86AudioMute";
+        locked = true;
+        action = {
+          kind = "exec";
+          command = "${lib.getExe' pkgs.swayosd "swayosd-client"} --output-volume mute-toggle";
+        };
+      };
+
       media-play = mediaKey "XF86AudioPlay" "play-pause";
       media-next = mediaKey "XF86AudioNext" "next";
       media-previous = mediaKey "XF86AudioPrev" "previous";

configs/nixos/modules/desktop/utilities/osd.nix

@@ -5,39 +5,41 @@
   ...
 }:
 # SwayOSD: a transient on-screen popup for volume and brightness changes.
-let
-  user = config.user.name;
-in
 {
   options.modules.desktop.utilities.osd.enable =
     lib.mkEnableOption "the SwayOSD volume and brightness popup";
 
   config = lib.mkIf config.modules.desktop.utilities.osd.enable {
+    environment.systemPackages = [ pkgs.swayosd ];
+
+    # The udev rule chgrps each backlight's brightness node to `video` and adds
+    # group write, so the server dims the panel without root.
+    # Membership below grants the running session that access.
+    services.udev.packages = [ pkgs.swayosd ];
+    users.users.${config.user.name}.extraGroups = [ "video" ];
+
+    # The server draws the popups, so it runs for the whole graphical session.
+    # It binds to the target uwsm activates.
+    home-manager.users.${config.user.name}.systemd.user.services.swayosd = {
+      Unit = {
+        Description = "SwayOSD on-screen display server";
+        PartOf = [ "graphical-session.target" ];
+        After = [ "graphical-session.target" ];
+      };
+      Service = {
+        ExecStart = lib.getExe' pkgs.swayosd "swayosd-server";
+        Restart = "on-failure";
+      };
+      Install.WantedBy = [ "graphical-session.target" ];
+    };
+
     registry.keybind.${config.networking.hostName} = {
-      volume-up = {
-        keys = "XF86AudioRaiseVolume";
-        repeating = true;
-        action = {
-          kind = "exec";
-          command = "${pkgs.swayosd}/bin/swayosd-client --output-volume raise --max-volume 100";
-        };
-      };
-
-      volume-down = {
-        keys = "XF86AudioLowerVolume";
-        repeating = true;
-        action = {
-          kind = "exec";
-          command = "${pkgs.swayosd}/bin/swayosd-client --output-volume lower";
-        };
-      };
-
       brightness-up = {
         keys = "XF86MonBrightnessUp";
         repeating = true;
         action = {
           kind = "exec";
-          command = "${pkgs.swayosd}/bin/swayosd-client --brightness raise";
+          command = "${lib.getExe' pkgs.swayosd "swayosd-client"} --brightness raise";
         };
       };
 
@@ -46,41 +48,9 @@ in
         repeating = true;
         action = {
           kind = "exec";
-          command = "${pkgs.swayosd}/bin/swayosd-client --brightness lower";
+          command = "${lib.getExe' pkgs.swayosd "swayosd-client"} --brightness lower";
         };
       };
-
-      mute = {
-        keys = "XF86AudioMute";
-        locked = true;
-        action = {
-          kind = "exec";
-          command = "${pkgs.swayosd}/bin/swayosd-client --output-volume mute-toggle";
-        };
-      };
-    };
-
-    environment.systemPackages = [ pkgs.swayosd ];
-
-    # The udev rule chgrps each backlight's brightness node to `video` and adds
-    # group write, so the server dims the panel without root.
-    # Membership below grants the running session that access.
-    services.udev.packages = [ pkgs.swayosd ];
-    users.users.${user}.extraGroups = [ "video" ];
-
-    # The server draws the popups, so it runs for the whole graphical session.
-    # It binds to the target uwsm activates.
-    home-manager.users.${user}.systemd.user.services.swayosd = {
-      Unit = {
-        Description = "SwayOSD on-screen display server";
-        PartOf = [ "graphical-session.target" ];
-        After = [ "graphical-session.target" ];
-      };
-      Service = {
-        ExecStart = "${pkgs.swayosd}/bin/swayosd-server";
-        Restart = "on-failure";
-      };
-      Install.WantedBy = [ "graphical-session.target" ];
     };
   };
 }