added stuff

nyx/modules/options/usrEnv/brightness.nix

@@ -0,0 +1,58 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: let
+  inherit (lib.options) mkOption;
+  inherit (lib.types) ints bool enum package;
+
+  cfg = config.modules.usrEnv.brightness;
+in {
+  options.modules.usrEnv.brightness = {
+    enable = mkOption {
+      type = bool;
+      default = false;
+      description = ''
+        Enable brightness management with systemd.
+      '';
+    };
+
+    package = mkOption {
+      type = package;
+      default = pkgs.writeShellApplication {
+        name = "set-system-brightness";
+        runtimeInputs = with pkgs; [brightnessctl];
+        text = "brightnessctl set ${cfg.value}";
+      };
+    };
+
+    value = mkOption {
+      type = ints.between 0 100;
+      default = 85; # try to save some battery on laptops
+      description = ''
+        The screen brightness that will be set once the graphical target is reached.
+      '';
+    };
+
+    service = {
+      type = mkOption {
+        type = enum ["oneshot" "simple"];
+        default = "oneshot";
+        description = ''
+          The type of the service to be used for setting brightness on graphical session start.
+        '';
+      };
+
+      target = mkOption {
+        type = enum ["graphical-session.target" "multi-user.target"];
+        default = "graphical-session.target";
+        description = ''
+          The target that the systemd-brightnessd service will be bound to.
+
+          This effectively sets the `after` attribute in the serviceConfig
+        '';
+      };
+    };
+  };
+}