initial refactoring

platforms/nixos/modules/nmasur/presets/services/lightdm.nix

@@ -0,0 +1,35 @@
+{
+  config,
+  lib,
+  ...
+}:
+
+let
+  cfg = config.nmasur.presets.services.lightdm;
+in
+
+{
+
+  options.nmasur.presets.services.lightdm.enable = lib.mkEnableOption "Lightdm display manager";
+
+  config = lib.mkIf cfg.enable {
+
+    services.xserver = {
+      enable = true;
+
+      # Login screen
+      displayManager = {
+        lightdm = {
+          enable = true;
+          background = config.wallpaper;
+
+          # Show default user
+          # Also make sure /var/lib/AccountsService/users/<user> has SystemAccount=false
+          extraSeatDefaults = ''
+            greeter-hide-users = false
+          '';
+        };
+      };
+    };
+  };
+}