refactor(waybar): register workspace window icons

configs/nixos/modules/desktop/apps/firefox.nix

@@ -26,6 +26,11 @@ in
   };
 
   config = lib.mkIf cfg.enable {
+    registry.window-icon.${config.networking.hostName}.firefox = {
+      class = ".*[Ff]irefox.*";
+      icon = "f269";
+    };
+
     home-manager.users.${config.user.name} = hm: {
       programs.firefox = {
         enable = true;

configs/nixos/modules/desktop/apps/ghostty.nix

@@ -20,6 +20,11 @@ in
       };
     };
 
+    registry.window-icon.${config.networking.hostName}.ghostty = {
+      class = "com.mitchellh.ghostty";
+      icon = "f120";
+    };
+
     home-manager.users.${user}.home.packages = [ pkgs.ghostty ];
   };
 }

configs/nixos/modules/desktop/apps/obsidian.nix

@@ -14,5 +14,10 @@ in
 
   config = lib.mkIf config.modules.desktop.apps.obsidian.enable {
     home-manager.users.${user}.home.packages = [ pkgs.obsidian ];
+
+    registry.window-icon.${config.networking.hostName}.obsidian = {
+      class = "obsidian";
+      icon = "f02d";
+    };
   };
 }

configs/nixos/modules/desktop/apps/signal.nix

@@ -13,5 +13,10 @@ in
 
   config = lib.mkIf config.modules.desktop.apps.signal.enable {
     home-manager.users.${user}.home.packages = [ pkgs.signal-desktop ];
+
+    registry.window-icon.${config.networking.hostName}.signal = {
+      class = "[Ss]ignal";
+      icon = "f4ad";
+    };
   };
 }

configs/nixos/modules/desktop/apps/steam.nix

@@ -23,5 +23,10 @@
     environment.systemPackages = [
       pkgs.gamescope
     ];
+
+    registry.window-icon.${config.networking.hostName}.steam = {
+      class = "[Ss]team";
+      icon = "f1b6";
+    };
   };
 }

configs/nixos/modules/desktop/apps/vencord.nix

@@ -14,5 +14,10 @@ in
 
   config = lib.mkIf config.modules.desktop.apps.vencord.enable {
     home-manager.users.${user}.home.packages = [ pkgs.vesktop ];
+
+    registry.window-icon.${config.networking.hostName}.vesktop = {
+      class = "[Vv]esktop";
+      icon = "f1ff";
+    };
   };
 }

configs/nixos/modules/desktop/session/waybar.nix

@@ -11,7 +11,6 @@ let
   # A Nerd Font Private-Use-Area codepoint as a literal character, decoded
   # through JSON so the glyph survives as bytes rather than an editor paste.
   g = code: builtins.fromJSON ''"\u${code}"'';
-  user = config.user.name;
 
   sleepOffIcon = builtins.fromJSON ''"\udb81\udcb3"'';
 
@@ -19,7 +18,7 @@ let
   # With no mako daemon answering, the status reads "notifications on", keeping
   # the widget inert rather than broken.
   dndStatus = pkgs.writeShellScript "waybar-dnd-status" ''
-    if ${pkgs.mako}/bin/makoctl mode 2>/dev/null | ${pkgs.gnugrep}/bin/grep -qx dnd; then
+    if ${lib.getExe' pkgs.mako "makoctl"} mode 2>/dev/null | ${lib.getExe pkgs.gnugrep} -qx dnd; then
       printf '{"text":"${g "f1f6"}","tooltip":"Do not disturb: on","class":"dnd"}\n'
     else
       printf '{"text":"${g "f0f3"}","tooltip":"Notifications on","class":"active"}\n'
@@ -27,14 +26,14 @@ let
   '';
 
   dndToggle = pkgs.writeShellScript "waybar-dnd-toggle" ''
-    ${pkgs.mako}/bin/makoctl mode -t dnd >/dev/null 2>&1
+    ${lib.getExe' pkgs.mako "makoctl"} mode -t dnd >/dev/null 2>&1
-    ${pkgs.procps}/bin/pkill -RTMIN+8 waybar
+    ${lib.getExe' pkgs.procps "pkill"} -RTMIN+8 waybar
   '';
 
   # Lit while a wf-recorder capture is running.
   # Empty text collapses the widget when idle, so it shows nothing until then.
   recStatus = pkgs.writeShellScript "waybar-recording-status" ''
-    if ${pkgs.procps}/bin/pgrep -x wf-recorder >/dev/null; then
+    if ${lib.getExe' pkgs.procps "pgrep"} -x wf-recorder >/dev/null; then
       printf '{"text":"${g "f03d"}","tooltip":"Recording","class":"recording"}\n'
     else
       printf '{"text":"","class":"idle"}\n'
@@ -42,7 +41,7 @@ let
   '';
 
   idleLockStatus = pkgs.writeShellScript "waybar-idle-lock-status" ''
-    if ${pkgs.systemd}/bin/systemctl --user is-active --quiet lockscreen-idle-inhibit.service; then
+    if ${lib.getExe' pkgs.systemd "systemctl"} --user is-active --quiet lockscreen-idle-inhibit.service; then
       printf '{"text":"${sleepOffIcon}","tooltip":"Idle locking inhibited","class":"inhibited"}\n'
     else
       printf '{"text":"","class":"idle"}\n'
@@ -52,14 +51,14 @@ let
   vpnStatus = pkgs.writeShellScript "waybar-vpn-status" ''
     interface=${lib.escapeShellArg vpnClient.interface}
 
-    if ! ${pkgs.iproute2}/bin/ip link show dev "$interface" >/dev/null 2>&1; then
+    if ! ${lib.getExe' pkgs.iproute2 "ip"} link show dev "$interface" >/dev/null 2>&1; then
       printf '{"text":"","class":"idle"}\n'
       exit 0
     fi
 
-    ipaddr=$(${pkgs.iproute2}/bin/ip -4 -o addr show dev "$interface" | ${pkgs.gawk}/bin/awk '{ print $4; exit }')
+    ipaddr=$(${lib.getExe' pkgs.iproute2 "ip"} -4 -o addr show dev "$interface" | ${lib.getExe' pkgs.gawk "awk"} '{ print $4; exit }')
 
-    ${pkgs.jq}/bin/jq -cn \
+    ${lib.getExe pkgs.jq} -cn \
       --arg text "󰲝" \
       --arg tooltip "VPN $interface: ''${ipaddr:-no IPv4}" \
       --arg class "active" \
@@ -68,12 +67,12 @@ let
 
   networkStatus = pkgs.writeShellScript "waybar-network-status" ''
     active=$(
-      ${pkgs.networkmanager}/bin/nmcli -t -f DEVICE,TYPE,STATE,CONNECTION device status \
+      ${lib.getExe' pkgs.networkmanager "nmcli"} -t -f DEVICE,TYPE,STATE,CONNECTION device status \
-        | ${pkgs.gawk}/bin/awk -F: '$3 == "connected" && $2 != "loopback" { print; exit }'
+        | ${lib.getExe' pkgs.gawk "awk"} -F: '$3 == "connected" && $2 != "loopback" { print; exit }'
     )
 
     if [ -z "$active" ]; then
-      ${pkgs.jq}/bin/jq -cn \
+      ${lib.getExe pkgs.jq} -cn \
         --arg text "${g "f127"} off" \
         --arg tooltip "Network disconnected" \
         --arg class "disconnected" \
@@ -89,9 +88,9 @@ let
       *) icon="NET" ;;
     esac
 
-    ipaddr=$(${pkgs.iproute2}/bin/ip -4 -o addr show dev "$device" | ${pkgs.gawk}/bin/awk '{ print $4; exit }')
+    ipaddr=$(${lib.getExe' pkgs.iproute2 "ip"} -4 -o addr show dev "$device" | ${lib.getExe' pkgs.gawk "awk"} '{ print $4; exit }')
 
-    ${pkgs.jq}/bin/jq -cn \
+    ${lib.getExe pkgs.jq} -cn \
       --arg text "$icon $connection" \
       --arg tooltip "$device: ''${ipaddr:-no IPv4}" \
       --arg class "$type" \
@@ -106,7 +105,7 @@ in
     # codepoints Stylix's monospace font does not carry.
     fonts.packages = [ pkgs.nerd-fonts.symbols-only ];
 
-    home-manager.users.${user}.programs.waybar = {
+    home-manager.users.${config.user.name}.programs.waybar = {
       enable = true;
 
       # A user service bound to graphical-session.target, which uwsm activates,
@@ -151,16 +150,9 @@ in
           format = "{id} {windows}";
           format-window-separator = " ";
           window-rewrite-default = g "f2d0";
-          window-rewrite = {
+          window-rewrite = lib.mapAttrs' (
-            "class<com.mitchellh.ghostty>" = g "f120";
+            _name: windowIcon: lib.nameValuePair "class<${windowIcon.class}>" (g windowIcon.icon)
-            "class<.*[Ff]irefox.*>" = g "f269";
+          ) (lib.attrByPath [ config.networking.hostName ] { } config.registry.window-icon);
-            "class<chromium.*>" = g "f268";
-            "class<[Cc]ode>" = g "f121";
-            "class<obsidian>" = g "f02d";
-            "class<[Ss]ignal>" = g "f4ad";
-            "class<[Ss]team>" = g "f1b6";
-            "class<[Vv]esktop>" = g "f1ff";
-          };
         };
 
         clock = {
@@ -190,7 +182,7 @@ in
             (g "f027")
             (g "f028")
           ];
-          on-click = "${pkgs.wireplumber}/bin/wpctl set-mute @DEFAULT_AUDIO_SINK@ toggle";
+          on-click = "${lib.getExe' pkgs.wireplumber "wpctl"} set-mute @DEFAULT_AUDIO_SINK@ toggle";
         };
 
         "custom/vpn" = {

configs/nixos/registry/window-icon.nix

@@ -0,0 +1,19 @@
+{ lib, ... }:
+{
+
+  type = lib.types.submodule {
+    options = {
+      class = lib.mkOption {
+        description = "Matches the window class reported by the compositor.";
+        type = lib.types.str;
+        example = ".*[Ff]irefox.*";
+      };
+
+      icon = lib.mkOption {
+        description = "Sets the Nerd Font codepoint shown for matching windows.";
+        type = lib.types.str;
+        example = "f269";
+      };
+    };
+  };
+}