some refactoring and modularizing locale

modules/nixos/hardware/graphics/nvidia/default.nix

@@ -0,0 +1,72 @@
+{
+  pkgs,
+  config,
+  lib,
+  ...
+}: let
+  nvidia-offload = pkgs.writeShellScriptBin "nvidia-offload" ''
+    export LIBVA_DRIVER_NAME=nvidia
+    export GBM_BACKEND=nvidia-drm
+    export __GLX_VENDOR_LIBRARY_NAME=nvidia
+    export __GL_VRR_ALLOWED=1
+    export XDG_SESSION_TYPE=wayland
+    export NVD_BACKEND=direct
+    export ELECTRON_OZONE_PLATFORM_HINT=auto
+        exec "$@"
+  '';
+  inherit (lib) types mkIf mkEnableOption mkOption;
+  cfg = config.nixos.hardware.graphics.nvidia;
+in {
+  options = {
+    nixos.hardware.graphics.nvidia = {
+      enable = mkEnableOption "Enables NVidia graphics";
+      package = mkOption {
+        type = types.enum ["stable" "beta" "production" "latest"];
+        default = "stable";
+        description = "Choose between the stable, beta, latest, or production NVidia driver package";
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [
+      egl-wayland
+    ];
+    hardware = {
+      graphics = {
+        enable = true;
+        enable32Bit = true;
+        extraPackages = with pkgs; [
+          nvidia-offload
+          libva
+          vaapiVdpau
+          libvdpau-va-gl
+          intel-media-driver
+          nvidia-vaapi-driver
+          vulkan-tools
+        ];
+        extraPackages32 = with pkgs.pkgsi686Linux; [
+          vaapiVdpau
+          libvdpau-va-gl
+        ];
+      };
+      nvidia = {
+        package =
+          if cfg.package == "beta"
+          then config.boot.kernelPackages.nvidiaPackages.beta
+          else if cfg.package == "latest"
+          then config.boot.kernelPackages.nvidiaPackages.latest
+          else if cfg.package == "production"
+          then config.boot.kernelPackages.nvidiaPackages.prodution
+          else config.boot.kernelPackages.nvidiaPackages.stable;
+        modesetting.enable = true;
+        powerManagement = {
+          enable = false;
+          finegrained = false;
+        };
+        open = true;
+        nvidiaSettings = true;
+      };
+    };
+  };
+}