Extract GDM and Tuigreet configurations into separate files

modules/system/dm.nix

@@ -1,36 +0,0 @@
-{
-  config,
-  pkgs,
-  lib,
-  ...
-}:
-let
-  cfg = config.myConfig.dm;
-in
-{
-  options.myConfig.dm = {
-    gdm.enable = lib.mkEnableOption "";
-    tuigreet.enable = lib.mkEnableOption "";
-  };
-
-  config = {
-    services.xserver = lib.mkIf cfg.gdm.enable {
-      enable = true;
-      displayManager.gdm.enable = true;
-    };
-
-    services.greetd = lib.mkIf cfg.tuigreet.enable {
-      enable = true;
-      settings = {
-        default_session =
-          let
-            base = config.services.xserver.displayManager.sessionData.desktops;
-          in
-          {
-            command = "${lib.getExe pkgs.greetd.tuigreet} --time --asterisks --remember --remember-user-session --sessions ${base}/share/wayland-sessions:${base}/share/xsessions";
-            user = "greeter";
-          };
-      };
-    };
-  };
-}

modules/system/dm/gdm.nix

@@ -0,0 +1,11 @@
+{ config, lib, ... }:
+{
+  options.myConfig.dm.gdm.enable = lib.mkEnableOption "";
+
+  config = lib.mkIf config.myConfig.dm.gdm.enable {
+    services.xserver = {
+      enable = true;
+      displayManager.gdm.enable = true;
+    };
+  };
+}

modules/system/dm/tuigreet.nix

@@ -0,0 +1,32 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+{
+  options.myConfig.dm.tuigreet.enable = lib.mkEnableOption "";
+
+  config = lib.mkIf config.myConfig.dm.tuigreet.enable {
+    services.greetd = {
+      enable = true;
+      settings = {
+        default_session =
+          let
+            sessionData = config.services.displayManager.sessionData.desktops;
+          in
+          {
+            user = "greeter";
+            command = lib.concatStringsSep " " [
+              (lib.getExe pkgs.greetd.tuigreet)
+              "--time"
+              "--asterisks"
+              "--remember"
+              "--remember-user-session"
+              "--sessions '${sessionData}/share/wayland-sessions:${sessionData}/share/xsessions'"
+            ];
+          };
+      };
+    };
+  };
+}