add DankMaterialShell

modules/nixos/desktop/common/greeter.nix

@@ -9,12 +9,13 @@
 in {
   options = {
     module.desktop.displayManager = mkOption {
-      default = "greetd";
+      default = null;
       type = types.enum [
         "cosmic"
         "gdm"
         "greetd"
         "sddm"
+        null
       ];
     };
   };

modules/nixos/desktop/default.nix

@@ -2,6 +2,7 @@
   imports = [
     ./common
     ./cosmic
+    ./dms
     ./gnome
     ./hyprland
     ./niri

modules/nixos/desktop/dms/default.nix

@@ -0,0 +1,44 @@
+{
+  config,
+  inputs,
+  lib,
+  perSystem,
+  pkgs,
+  ...
+}:
+with lib; let
+  cfg = config.desktop.dms;
+in {
+  imports = with inputs; [
+    dankMaterialShell.nixosModules.dankMaterialShell
+    dankMaterialShell.nixosModules.greeter
+    niri-flake.nixosModules.niri
+  ];
+  options = {
+    desktop.dms.enable =
+      mkEnableOption "enable DankMaterialShell";
+  };
+  config = mkIf cfg.enable {
+    xdg.portal = {
+      enable = true;
+      extraPortals = with pkgs; [xdg-desktop-portal-gnome xdg-desktop-portal-gtk];
+      config.niri.default = ["gnome" "gtk"];
+    };
+
+    module.desktop.gnome-keyring.enable = true;
+    sound.pipewire.enable = true;
+
+    programs.niri = {
+      enable = true;
+      package = perSystem.niri.niri;
+    };
+
+    programs.dankMaterialShell = {
+      enable = true;
+      greeter = {
+        enable = true;
+        compositor.name = "niri";
+      };
+    };
+  };
+}