add wluma to control backlight

home/modules/default.nix

@@ -17,6 +17,7 @@
       ./fuzzel.nix
       ./firefox.nix
       ./niri.nix
+      ./wluma.nix
     ];
 
   options = {

home/modules/niri.nix

@@ -29,6 +29,7 @@ in
     ];
     youthlic.programs = {
       fuzzel.enable = true;
+      wluma.enable = true;
     };
     programs.niri = {
       config = builtins.readFile cfg.config;

home/modules/wluma.nix

@@ -0,0 +1,57 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+let
+  cfg = config.youthlic.programs.wluma;
+in
+{
+  options = {
+    youthlic.programs.wluma = {
+      enable = lib.mkEnableOption "wluma";
+      config = lib.mkOption {
+        type = lib.types.path;
+        example = ./config.toml;
+        description = ''
+          path to config file of wluma
+        '';
+      };
+      package = lib.mkOption {
+        type = lib.types.package;
+        example = pkgs.wluam;
+        default = pkgs.wluma;
+        description = ''
+          pakcage of wluma
+        '';
+      };
+    };
+  };
+  config = lib.mkIf cfg.enable {
+    home.packages = [
+      cfg.package
+    ];
+    xdg.configFile."wluma/config.toml" = {
+      enable = true;
+      source = cfg.config;
+    };
+    systemd.user.services.wluma = {
+      Unit = {
+        Description = "Adjusting screen brightness based on screen contents and amount of ambient light";
+        PartOf = [ "graphical-session.target" ];
+        After = [ "graphical-session.target" ];
+      };
+      Service = {
+        ExecStart = [ "${lib.getExe cfg.package}" ];
+        Restart = "always";
+        EnvironmentFile = [ "-%E/wluma/service.conf" ];
+        PrivateNetwork = true;
+        PrivateMounts = false;
+      };
+      Install = {
+        WantedBy = [ "graphical-session.target" ];
+      };
+    };
+  };
+}