add greetd

modules/hyprland/sys/hyprland.nix

@@ -1,11 +1,29 @@
 { inputs, ... }: {
-  flake.nixosModules.hyprland-sys-hyprland = { pkgs, ... }: {
+  flake.nixosModules.hyprland-sys-hyprland = { pkgs, ... }: let
+    tuigreet = "${pkgs.greetd.tuigreet}/bin/tuigreet";
+    session   = "${pkgs.hyprland}/bin/Hyprland";
+    username  = "mo";
+  in {
     programs.hyprland = {
       enable = true;
       xwayland.enable = true;
       withUWSM = true;
     };
 
+    services.greetd = {
+      enable = true;
+      settings = {
+        initial_session = {
+          command = session;
+          user    = username;
+        };
+        default_session = {
+          command = "${tuigreet} --greeting 'Welcome to NixOS!' --asterisks --remember --remember-user-session --time --cmd ${session}";
+          user    = "greeter";
+        };
+      };
+    };
+
     environment.systemPackages = [
       inputs.caelestia-shell.packages.${pkgs.stdenv.hostPlatform.system}.with-cli
     ];