pollymc/packages/nix/polymc/default.nix

{ lib
, mkDerivation
, fetchFromGitHub
, makeDesktopItem
, cmake
, ninja
, jdk8
, jdk
, zlib
, file
, makeWrapper
, xorg
, libpulseaudio
, qtbase
, libGL
, msaClientID ? ""

# flake
, self
, submoduleNbt
, submoduleQuazip
}:

let
  # Libraries required to run Minecraft
  libpath = with xorg; lib.makeLibraryPath [
    libX11
    libXext
    libXcursor
    libXrandr
    libXxf86vm
    libpulseaudio
    libGL
  ]; 

  # This variable will be passed to Minecraft by PolyMC
  gameLibraryPath = libpath + ":/run/opengl-driver/lib";
in

mkDerivation rec {
  pname = "polymc";
  version = "nightly";

  src = lib.cleanSource self;

  nativeBuildInputs = [ cmake ninja file makeWrapper ];
  buildInputs = [ qtbase jdk8 zlib ];

  dontWrapQtApps = true;

  postPatch = ''
    # hardcode jdk paths
    substituteInPlace launcher/java/JavaUtils.cpp \
      --replace 'scanJavaDir("/usr/lib/jvm")' 'javas.append("${jdk}/lib/openjdk/bin/java")' \
      --replace 'scanJavaDir("/usr/lib32/jvm")' 'javas.append("${jdk8}/lib/openjdk/bin/java")'
  '' + lib.optionalString (msaClientID != "") ''
    # add client ID
    substituteInPlace CMakeLists.txt \
      --replace '17b47edd-c884-4997-926d-9e7f9a6b4647' '${msaClientID}'
  '';

  postUnpack = ''
    # Copy submodules inputs
    rm -rf source/libraries/{libnbtplusplus,quazip}
    mkdir source/libraries/{libnbtplusplus,quazip}
    cp -a ${submoduleNbt}/* source/libraries/libnbtplusplus
    cp -a ${submoduleQuazip}/* source/libraries/quazip
    chmod a+r+w source/libraries/{libnbtplusplus,quazip}/*
  '';

  cmakeFlags = [
    "-GNinja"
    "-DLauncher_LAYOUT=lin-system"
  ];

  desktopItem = makeDesktopItem {
    name = "polymc";
    exec = "polymc";
    icon = "polymc";
    desktopName = "PolyMC";
    genericName = "Minecraft Launcher";
    comment = "A custom launcher for Minecraft";
    categories = "Game;";
    extraEntries = ''
      Keywords=game;Minecraft;
    '';
  };

  postInstall = ''
    install -Dm644 ../launcher/resources/multimc/scalable/launcher.svg $out/share/pixmaps/polymc.svg
    install -Dm644 ${desktopItem}/share/applications/polymc.desktop $out/share/applications/org.polymc.PolyMC.desktop

    # xorg.xrandr needed for LWJGL [2.9.2, 3) https://github.com/LWJGL/lwjgl/issues/128
    wrapProgram $out/bin/polymc \
      "''${qtWrapperArgs[@]}" \
      --set GAME_LIBRARY_PATH ${gameLibraryPath} \
      --prefix PATH : ${lib.makeBinPath [ xorg.xrandr jdk ]}
  '';
}