{
  pkgs,
  config,
  lib,
  ...
}: {
  options = with lib;
  with types; {
    myWallPaperPathString = mkOption {type = str;};
    myUserName = mkOption {type = str;};
    myDisplayName = mkOption {type = str;};
    myEmail = mkOption {type = str;};
  };
  config = rec {
    myUserName = "stvnliu";
    myWallPaperPathString = "/home/${config.myUserName}/wallpaper.png";
    myDisplayName = "Zhongheng Liu";
    myEmail = "z.liu@outlook.com.gr";
  };
}