nixpkgs/pkgs/development/tools/xcpretty/gemset.nix

{
  rouge = {
    source = {
      remotes = ["https://rubygems.org"];
      sha256 = "0sfikq1q8xyqqx690iiz7ybhzx87am4w50w8f2nq36l3asw4x89d";
      type = "gem";
    };
    version = "2.0.7";
  };
  xcpretty = {
    dependencies = ["rouge"];
    source = {
      remotes = ["https://rubygems.org"];
      sha256 = "1xq47q2h5llj7b54rws4796904vnnjz7qqnacdv7wlp3gdbwrivm";
      type = "gem";
    };
    version = "0.3.0";
  };
}