Add gdm gnome sddm kde

modules/programs/sddm.nix

@@ -0,0 +1,44 @@
+{
+  lib,
+  options,
+  config,
+  ...
+}:
+{
+  options.mods.sddm = {
+    enable = lib.mkOption {
+      default = false;
+      example = true;
+      type = lib.types.bool;
+      description = "Enables the sddm displayManager";
+    };
+    useDefaultOptions = lib.mkOption {
+      default = true;
+      example = false;
+      type = lib.types.bool;
+      description = "Use default options provided by module. If disabled, will only apply extraOptions.";
+    };
+    extraOptions = lib.mkOption {
+      default = { };
+      example = {
+        wayland.enable = false;
+      };
+      type = with lib.types; attrsOf anything;
+      description = "Extra options to be applied to the sddm config";
+    };
+  };
+
+  config = lib.mkIf config.mods.sddm.enable (
+    lib.optionalAttrs (options ? services.displayManager.sddm) (
+      {
+        services.displayManager.sddm.enable = true;
+      }
+      // lib.mkIf config.mods.sddm.useDefaultOptions {
+        services.displayManager.sddm.wayland.enable = true;
+      }
+      // {
+        services.displayManager.sddm = config.mods.sddm.extraOptions;
+      }
+    )
+  );
+}