{
  description = "Home Manager configuration of john";

  inputs = {
    # Specify the source of Home Manager and Nixpkgs.
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    { nixpkgs, home-manager, ... }:
    let
      system = "x86_64-linux";
      pkgs = nixpkgs.legacyPackages.${system};
      lib = pkgs.lib;
      
      # Define a module that contains the user option
      optionsModule = { config, ... }: {
        options.user = lib.mkOption {
          type = lib.types.str;
          description = "The username for the Home Manager configuration.";
          default = "john";
        };
      };
      
      # Function to create a home configuration for any user
      mkHomeConfiguration = username: home-manager.lib.homeManagerConfiguration {
        inherit pkgs;
        modules = [ 
          ./home.nix 
          optionsModule
          # Override the user option for this specific configuration
          { user = username; }
        ];
      };
      
      # Default username from the module evaluation
      moduleEval = lib.evalModules {
        modules = [ optionsModule ];
      };
      defaultUsername = moduleEval.config.user;
    in
    {
      # Default configuration using the default username
      homeConfigurations.${defaultUsername} = mkHomeConfiguration defaultUsername;
      
      # Export the function so other flakes can create configurations for any user
      lib = {
        mkHomeConfiguration = mkHomeConfiguration;
        mkHomeConfigurationForUser = username: mkHomeConfiguration username;
      };
      
      # Export modules for reuse in other flakes
      homeManagerModules = {
        default = ./home.nix;
        john-config = ./home.nix;
        options-module = optionsModule;
      };
    };
}