refactor(waybar): produce core registry entries

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

@@ -54,6 +54,11 @@ in
 
     registry.waybar.${config.networking.hostName}."custom/dnd" = {
       order = 80;
+      style = ''
+        #custom-dnd {
+          margin-right: 8px;
+        }
+      '';
       settings = {
         return-type = "json";
         exec = "${dndStatus}";

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

@@ -6,47 +6,20 @@
 }:
 # Waybar: a top status bar reading system state at a glance.
 let
+  registeredWaybarStyles = lib.concatStringsSep "\n" (
+    lib.filter (style: style != "") (lib.mapAttrsToList (_name: module: module.style) hostWaybarModules)
+  );
+
+  hostWaybarModules = lib.attrByPath [ config.networking.hostName ] { } config.registry.waybar;
+
   waybarModulesFor =
     position:
     map (module: module.name) (
       lib.sort (a: b: a.order < b.order) (
-        lib.filter (module: module.position == position) (staticWaybarModules ++ registeredWaybarModules)
+        lib.filter (module: module.position == position) registeredWaybarModules
       )
     );
 
-  staticWaybarModules = [
-    {
-      name = "hyprland/workspaces";
-      position = "left";
-      order = 10;
-    }
-    {
-      name = "clock";
-      position = "center";
-      order = 10;
-    }
-    {
-      name = "mpris";
-      position = "right";
-      order = 30;
-    }
-    {
-      name = "wireplumber";
-      position = "right";
-      order = 40;
-    }
-    {
-      name = "custom/network";
-      position = "right";
-      order = 60;
-    }
-    {
-      name = "battery";
-      position = "right";
-      order = 70;
-    }
-  ];
-
   registeredWaybarModules = lib.mapAttrsToList (
     name: module:
     module
@@ -55,14 +28,12 @@ let
     }
   ) hostWaybarModules;
 
-  hostWaybarModules = lib.attrByPath [ config.networking.hostName ] { } config.registry.waybar;
+  registeredWaybarModuleSettings = lib.mapAttrs (_name: module: module.settings) hostWaybarModules;
 
   # 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}"'';
 
-  registeredWaybarModuleSettings = lib.mapAttrs (_name: module: module.settings) hostWaybarModules;
-
   networkStatus = pkgs.writeShellScript "waybar-network-status" ''
     active=$(
       ${lib.getExe' pkgs.networkmanager "nmcli"} -t -f DEVICE,TYPE,STATE,CONNECTION device status \
@@ -114,11 +85,8 @@ in
         .modules-right {
           margin-right: 8px;
         }
-
+      ''
-        #custom-dnd {
+      + registeredWaybarStyles;
-          margin-right: 8px;
-        }
-      '';
 
       settings.mainBar = lib.mkMerge [
         {
@@ -131,72 +99,93 @@ in
           modules-center = waybarModulesFor "center";
           modules-right = waybarModulesFor "right";
 
-          # Per-application icons for the windows on each workspace, mapped from
-          # window class with a neutral glyph for anything unlisted.
-          "hyprland/workspaces" = {
-            on-click = "activate";
-            format = "{id} {windows}";
-            format-window-separator = " ";
-            window-rewrite-default = g "f2d0";
-            window-rewrite = lib.mapAttrs' (
-              _name: windowIcon: lib.nameValuePair "class<${windowIcon.class}>" (g windowIcon.icon)
-            ) (lib.attrByPath [ config.networking.hostName ] { } config.registry.window-icon);
-          };
-
-          clock = {
-            format = "{:%a %d %b  %H:%M}";
-            tooltip-format = "<tt>{calendar}</tt>";
-            calendar = {
-              mode = "month";
-              # Underline the current day so it stands out in the grid.
-              format.today = "<b><u>{}</u></b>";
-            };
-          };
-
-          mpris = {
-            format = "${g "f001"} {title}";
-            format-paused = "${g "f04c"} {title}";
-            max-length = 40;
-            on-click = "play-pause";
-            on-scroll-up = "next";
-            on-scroll-down = "previous";
-          };
-
-          wireplumber = {
-            format = "{icon} {volume}%";
-            format-muted = "${g "f026"} muted";
-            format-icons = [
-              (g "f026")
-              (g "f027")
-              (g "f028")
-            ];
-            on-click = "${lib.getExe' pkgs.wireplumber "wpctl"} set-mute @DEFAULT_AUDIO_SINK@ toggle";
-          };
-
-          "custom/network" = {
-            return-type = "json";
-            exec = "${networkStatus}";
-            interval = 5;
-          };
-
-          battery = {
-            format = "{icon} {capacity}%";
-            format-charging = "${g "f0e7"} {capacity}%";
-            format-icons = [
-              (g "f244")
-              (g "f243")
-              (g "f242")
-              (g "f241")
-              (g "f240")
-            ];
-            states = {
-              warning = 20;
-              critical = 10;
-            };
-          };
         }
         registeredWaybarModuleSettings
       ];
     };
+
+    registry.waybar.${config.networking.hostName} = {
+      "hyprland/workspaces" = {
+        position = "left";
+        order = 10;
+        settings = {
+          on-click = "activate";
+          format = "{id} {windows}";
+          format-window-separator = " ";
+          window-rewrite-default = g "f2d0";
+          window-rewrite = lib.mapAttrs' (
+            _name: windowIcon: lib.nameValuePair "class<${windowIcon.class}>" (g windowIcon.icon)
+          ) (lib.attrByPath [ config.networking.hostName ] { } config.registry.window-icon);
+        };
+      };
+
+      clock = {
+        position = "center";
+        order = 10;
+        settings = {
+          format = "{:%a %d %b  %H:%M}";
+          tooltip-format = "<tt>{calendar}</tt>";
+          calendar = {
+            mode = "month";
+            # Underline the current day so it stands out in the grid.
+            format.today = "<b><u>{}</u></b>";
+          };
+        };
+      };
+
+      mpris = {
+        order = 30;
+        settings = {
+          format = "${g "f001"} {title}";
+          format-paused = "${g "f04c"} {title}";
+          max-length = 40;
+          on-click = "play-pause";
+          on-scroll-up = "next";
+          on-scroll-down = "previous";
+        };
+      };
+
+      wireplumber = {
+        order = 40;
+        settings = {
+          format = "{icon} {volume}%";
+          format-muted = "${g "f026"} muted";
+          format-icons = [
+            (g "f026")
+            (g "f027")
+            (g "f028")
+          ];
+          on-click = "${lib.getExe' pkgs.wireplumber "wpctl"} set-mute @DEFAULT_AUDIO_SINK@ toggle";
+        };
+      };
+
+      "custom/network" = {
+        order = 60;
+        settings = {
+          return-type = "json";
+          exec = "${networkStatus}";
+          interval = 5;
+        };
+      };
+
+      battery = {
+        order = 70;
+        settings = {
+          format = "{icon} {capacity}%";
+          format-charging = "${g "f0e7"} {capacity}%";
+          format-icons = [
+            (g "f244")
+            (g "f243")
+            (g "f242")
+            (g "f241")
+            (g "f240")
+          ];
+          states = {
+            warning = 20;
+            critical = 10;
+          };
+        };
+      };
+    };
   };
 }

configs/nixos/registry/waybar.nix

@@ -19,6 +19,12 @@
         description = "Sorts the module within its Waybar section.";
       };
 
+      style = lib.mkOption {
+        type = lib.types.lines;
+        default = "";
+        description = "Adds CSS for the Waybar module.";
+      };
+
       settings = lib.mkOption {
         type = lib.types.attrsOf lib.types.anything;
         default = { };