{
  namespace,
  lib,
  config,
  ...
}:
let
  inherit (lib)
    mkOption
    types
    mkDefault
    mkIf
    ;
in
{
  options.${namespace}.my = rec {
    name = mkOption {
      type = with types; str;
      default = config.snowfallorg.user.name or "marley";
      description = "Your username, for use as your login name.";
    };

    username = mkOption {
      type = with types; str;
      default = name;
      description = "Your username, for external profiles.";
    };

    fullName = mkOption {
      type = with types; str;
      default = name;
      description = "Your full name, for display purposes.";
    };

    email = mkOption {
      type = with types; nullOr str;
      default = null;
      description = "Your email";
    };

    git.name = mkOption {
      type = with types; str;
      default = username;
      description = "Your git committer name.";
    };

    git.email = mkOption {
      type = with types; nullOr str;
      default = email;
      description = "Your git committer email.";
    };
  };

  config =
    let
      cfg = config.${namespace}.my;
    in
    {
      assertions = [
        {
          assertion = cfg.name != null;
          message = "${namespace}.my.name must be set.";
        }
      ];

      home.username = mkDefault cfg.name;

      programs.git = mkIf config.programs.git.enable {
        userName = mkDefault cfg.git.name;
        userEmail = mkDefault cfg.git.email;
      };
    };
}