nixos/coolercontrol: Add support for Nvidia hardware

nixos/modules/programs/coolercontrol.nix

@@ -10,11 +10,24 @@ in
 {
   ##### interface
   options = {
-    programs.coolercontrol.enable = lib.mkEnableOption (lib.mdDoc "CoolerControl GUI & its background services");
+    programs.coolercontrol = {
+      enable = lib.mkEnableOption (lib.mdDoc "CoolerControl GUI & its background services");
+
+      nvidiaSupport = lib.mkOption {
+        type = lib.types.bool;
+        default = lib.elem "nvidia" config.services.xserver.videoDrivers;
+        defaultText = lib.literalExpression "lib.elem \"nvidia\" config.services.xserver.videoDrivers";
+        description = lib.mdDoc ''
+          Enable support for Nvidia GPUs.
+        '';
+      };
+    };
   };
 
   ##### implementation
-  config = lib.mkIf cfg.enable {
+  config = lib.mkIf cfg.enable (lib.mkMerge [
+    # Common
+    ({
       environment.systemPackages = with pkgs.coolercontrol; [
         coolercontrol-gui
       ];
@@ -31,7 +44,16 @@ in
           coolercontrold.wantedBy = [ "multi-user.target" ];
         };
       };
-  };
+    })
+
+    # Nvidia support
+    (lib.mkIf cfg.nvidiaSupport {
+      systemd.services.coolercontrold.path = with config.boot.kernelPackages; [
+        nvidia_x11 # nvidia-smi
+        nvidia_x11.settings # nvidia-settings
+      ];
+    })
+  ]);
 
   meta.maintainers = with lib.maintainers; [ OPNA2608 codifryed ];
 }