{
  lib,
  pkgs,
  ...
}: {
  # Make a modpack given its mod inputs.
  #
  # Mods should be attrsets in this format:
  #   {
  #     project = "";
  #     id = "";
  #     filename = "";
  #     sha256 = "";
  #   }
  #
  # This may be nice to read from a json ;)
  #
  mkModpack = {
    name,
    version,
    mods,
  }:
    pkgs.stdenv.mkDerivation {
      inherit name version;
      srcs = map pkgs.local.fetchFromCurseForge mods;

      sourceRoot = "src/";
      preUnpack = "mkdir -p src/";
      unpackCmd = "cp $curSrc src/";

      installPhase = ''
        mkdir -p $out/mods/
        cp * $out/mods
      '';
    };

  mkModpackZip = {
    name,
    version,
    mods,
  }:
    pkgs.stdenv.mkDerivation {
      inherit name version;
      srcs = map pkgs.local.fetchFromCurseForge mods;

      sourceRoot = "src/";
      preUnpack = "mkdir -p src/";
      unpackCmd = "cp $curSrc src/";

      buildInputs = [pkgs.zip];

      buildPhase = ''
        zip voor-kia-mods.zip *.jar
      '';

      installPhase = ''
        mkdir -p $out/
        cp voor-kia-mods.zip $out/
      '';
    };
}