default.nix

{stdenv, makeWrapper, fetchurl, jdk12_headless, ...}:

stdenv.mkDerivation rec {
  mcVersion = "1.15.2";
  build = "192";
  name = "paper-${mcVersion}-${build}";

  src = fetchurl {
    url = "https://papermc.io/api/v1/paper/${mcVersion}/${build}/download";
    sha256 = "011inrgkd7p45wiwfbljssqfi3zrgfq47hl4n7zxz6m23nxgklb7";
  };

  nativeBuildInputs = [ makeWrapper ];

  dontUnpack = true;

  buildPhase = ''
    mkdir -p $out/share/java
    cp $src $out/share/java/paperclip.jar
    '';

  installPhase = ''
    mkdir -p $out/bin
    makeWrapper ${jdk12_headless}/bin/java $out/bin/paperclip \
        --add-flags "-jar $out/share/java/paperclip.jar" \
        --add-flags "nogui" \
        --set JAVA_HOME ${jdk12_headless.home}
    '';
}