Add GNOME

- Add config option to switch between window managers / desktop environments
- Remove systemPackages attribute when a service or program attribute is available
- Add GNOME to gui

system/gui/dwm.nix

@@ -9,7 +9,6 @@
     ../app/launcher/rofi.nix
   ];
 
-  environment.systemPackages = [ pkgs.dwm ];
   services.xserver.windowManager.dwm.enable = true;
   services.xserver.displayManager.defaultSession = "none+dwm";
 }

system/gui/gnome.nix

@@ -0,0 +1,10 @@
+{ config, lib, pkgs, ... }:
+
+{
+  imports = [
+    ./x11.nix
+  ];
+
+  services.xserver.displayManager.gdm.enable = true;
+  services.xserver.desktopManager.gnome.enable = true;
+}

system/gui/lightdm.nix

@@ -1,8 +1,5 @@
 { config, lib, pkgs, ... }:
 
 {
-  environment.systemPackages = [ pkgs.lightdm ];
-  services.xserver.displayManager = {
-    lightdm.enable = true;
-  };
+  services.xserver.displayManager.lightdm.enable = true;
 }