feat(nix): add support for creating the config via home-manager

flake.nix

@@ -20,6 +20,16 @@
       # deprecated in Nix 2.8
       nixosModule = self.nixosModules.default;
 
+      homeManagerModules =
+        let
+          protontweaks = import ./nix/home-manager.nix;
+        in
+        {
+          protontweaks = protontweaks;
+          default = protontweaks;
+        };
+      homeManagerModule = self.homeManagerModules.default;
+
       overlay = final: prev: {
         protontweaks = prev.callPackage ./nix/pkgs/protontweaks.nix { };
       };

nix/home-manager.nix

@@ -0,0 +1,26 @@
+{ lib, config, pkgs, ... }:
+let
+  cfg = config.services.protontweaks;
+
+  inherit (lib) mkIf mkEnableOption;
+in
+{
+  options.services.protontweaks = {
+    enable = mkEnableOption "protontweaks";
+
+    gamemode = mkEnableOption "automatic gamemode initialization" // {
+      default = true;
+    };
+
+    mangohud = mkEnableOption "automatic mangohud initialization" // {
+      default = false;
+    };
+  };
+
+  config = mkIf (cfg.enable) {
+    home.file.".config/protontweaks.json".text = builtins.toJSON ({
+      gamemode = cfg.gamemode;
+      mangohud = cfg.mangohud;
+    });
+  };
+}