[desktop] Add a waylandOnly option

machines/nix-book/configuration.nix

@@ -12,7 +12,10 @@
   roles = {
     audio.enable = true;
     bluetooth.enable = true;
-    desktop.enable = true;
+    desktop = {
+      enable = true;
+      waylandOnly = true;
+    };
     nfs-mounts.enable = true;
     printing.enable = true;
     spotifyd.enable = true;

roles/desktop/default.nix

@@ -15,13 +15,11 @@ let
   ];
 
   x11BasePackages = with pkgs; [
-
+    customPackages.modrinthNvidia
   ];
 
   x11OnlyPackages = with pkgs; [
     emacs
-
-    customPackages.modrinthNvidia
   ];
 
   waylandBasePackages = with pkgs; [
@@ -42,6 +40,10 @@ in
       type = types.bool;
       default = false;
     };
+    waylandOnly = mkOption {
+      type = types.bool;
+      default = false;
+    };
   };
 
   config = mkIf cfg.enable
@@ -131,11 +133,10 @@ in
 
       environment.systemPackages = with pkgs; mkMerge [
         basePackages
-        x11BasePackages
+        (mkIf (!cfg.waylandOnly) x11BasePackages)
         (mkIf cfg.x11Only x11OnlyPackages)
-        # TODO: Do we need a "wayland only" mode?
         (mkIf (!cfg.x11Only) waylandBasePackages)
-        (mkIf (!cfg.x11Only) waylandOnlyPackages)
+        (mkIf (cfg.waylandOnly) waylandOnlyPackages)
       ];
     };