feat(niri): giving niri a test drive

modules/nixos/services/greetd/default.nix

@@ -1,6 +1,7 @@
 {
   config,
   lib,
+  pkgs,
   ...
 }:
 let
@@ -9,8 +10,11 @@ let
     mkEnableOption
     mkOption
     types
+    mkMerge
     ;
   cfg = config.nixos.services.greetd;
+  hyprcfg = config.nixos.programs.hyprland;
+  niricfg = config.nixos.programs.niri;
 in
 {
   options = {
@@ -28,21 +32,47 @@ in
     };
   };
 
-  config = mkIf cfg.enable {
-    services.greetd =
-      let
-        session = {
-          command = "${lib.getExe config.programs.uwsm.package} start hyprland-uwsm.desktop";
-          user = cfg.user;
+  config =
+    let
+      usernames = builtins.attrNames config.home-manager.users;
+      username = builtins.head usernames;
+    in
+    mkMerge [
+      (mkIf cfg.enable { services.greetd.enable = true; })
+
+      (mkIf hyprcfg.enable {
+        services.greetd =
+          let
+            session = {
+              command = "${lib.getExe config.programs.uwsm.package} start hyprland-uwsm.desktop";
+              user = cfg.user;
+            };
+          in
+          {
+            settings = {
+              terminal.vt = 1;
+              default_session = session;
+              initial_session = session;
+            };
+          };
+      })
+
+      (mkIf niricfg.enable {
+        services.greetd = {
+          enable = true;
+          settings = rec {
+            tuigreet_session =
+              let
+                session = "${pkgs.niri-unstable}/bin/niri-session";
+                tuigreet = "${lib.getExe pkgs.tuigreet}";
+              in
+              {
+                command = "${tuigreet} --time --remember --cmd ${session}";
+                user = "greeter";
+              };
+            default_session = tuigreet_session;
+          };
         };
-      in
-      {
-        enable = true;
-        settings = {
-          terminal.vt = 1;
-          default_session = session;
-          initial_session = session;
-        };
-      };
-  };
+      })
+    ];
 }