Add volume icon to waybar

wm/waybar.nix

@@ -21,11 +21,26 @@
       ];
 
       modules-right = [
+        "pulseaudio"
         "cpu"
         "tray"
         "clock"
       ];
 
+      pulseaudio = {
+        format = "{icon} {volume}%";
+        format-muted = "󰝟 muted";
+        tooltip = false;
+
+        scroll-step = 5;
+
+        format-icons = {
+          default = [ "󰕿" "󰖀" "󰕾" ];
+        };
+
+        on-click = "wpctl set-mute @DEFAULT_AUDIO_SINK@ toggle";
+      };
+
       mpris = {
         player = "spotify";
         format = "{player_icon} {artist} - {title}";
@@ -35,7 +50,7 @@
       };
 
       cpu = {
-        format = "{usage}% ";
+        format = "  {usage}%";
         tooltip = false;
       };