depot/third_party/nixpkgs/pkgs/by-name/lc/lc0/package.nix

{
  stdenv,
  lib,
  fetchFromGitHub,
  meson,
  ninja,
  pkg-config,
  python3,
  zlib,
  gtest,
  eigen,
}:

stdenv.mkDerivation rec {
  pname = "lc0";
  version = "0.31.2";

  src = fetchFromGitHub {
    owner = "LeelaChessZero";
    repo = "lc0";
    rev = "refs/tags/v${version}";
    hash = "sha256-8watDDxSyZ5khYqpXPyjQso2MkOzfI6o2nt0vkuiEUI=";
    fetchSubmodules = true;
  };

  patchPhase = ''
    runHook prePatch

    patchShebangs --build scripts/*

    runHook postPatch
  '';

  strictDeps = true;

  nativeBuildInputs = [
    meson
    ninja
    pkg-config
    python3
  ];

  buildInputs = [
    eigen
    gtest
    zlib
  ];

  mesonFlags =
    [
      "-Dplain_cuda=false"
      "-Daccelerate=false"
      "-Dmetal=disabled"
      "-Dembed=false"
    ]
    # in version 31 this option will be required
    ++ lib.optionals (lib.versionAtLeast version "0.31") [ "-Dnative_cuda=false" ];

  enableParallelBuilding = true;

  meta = {
    homepage = "https://lczero.org/";
    description = "Open source neural network based chess engine";
    longDescription = ''
      Lc0 is a UCI-compliant chess engine designed to play chess via neural network, specifically those of the LeelaChessZero project.
    '';
    maintainers = with lib.maintainers; [ _9glenda ];
    platforms = lib.platforms.unix;
    license = lib.licenses.gpl3Plus;
    broken = stdenv.hostPlatform.isDarwin;
  };

}