nixpkgs/pkgs/games/dwarf-fortress/dfhack/default.nix

{ stdenv, hostPlatform, lib, fetchFromGitHub, cmake, writeScriptBin, callPackage
, perl, XMLLibXML, XMLLibXSLT, zlib
, enableStoneSense ? false,  allegro5, libGLU_combined
, SDL
}:

let
  dfVersion = "0.44.11";
  version = "${dfVersion}-alpha1";

  # revision of library/xml submodule
  xmlRev = "853bd161270f50b21fe4b751de339458f78f56d6";

  arch =
    if stdenv.system == "x86_64-linux" then "64"
    else if stdenv.system == "i686-linux" then "32"
    else throw "Unsupported architecture";

  fakegit = writeScriptBin "git" ''
    #! ${stdenv.shell}
    if [ "$*" = "describe --tags --long" ]; then
      echo "${version}-unknown"
    elif [ "$*" = "rev-parse HEAD" ]; then
      if [ "$(dirname "$(pwd)")" = "xml" ]; then
        echo "${xmlRev}"
      else
        echo "refs/tags/${version}"
      fi
    elif [ "$*" = "rev-parse HEAD:library/xml" ]; then
      echo "${xmlRev}"
    else
      exit 1
    fi
  '';

in stdenv.mkDerivation rec {
  name = "dfhack-${version}";

  # Beware of submodules
  src = fetchFromGitHub {
    owner = "DFHack";
    repo = "dfhack";
    sha256 = "1vzrpdw0pn18calayf9dwqpyg37cb7wkzkvskxjx9nak5ilxzywm";
    rev = version;
    fetchSubmodules = true;
  };

  nativeBuildInputs = [ cmake perl XMLLibXML XMLLibXSLT fakegit ];
  # We don't use system libraries because dfhack needs old C++ ABI.
  buildInputs = [ zlib SDL ]
             ++ lib.optionals enableStoneSense [ allegro5 libGLU_combined ];

  preConfigure = ''
    # Trick build system into believing we have .git
    mkdir -p .git/modules/library/xml
    touch .git/index .git/modules/library/xml/index
  '';

  preBuild = ''
    export LD_LIBRARY_PATH="$PWD/depends/protobuf:$LD_LIBRARY_PATH"
  '';

  cmakeFlags = [ "-DDFHACK_BUILD_ARCH=${arch}" "-DDOWNLOAD_RUBY=OFF" ]
            ++ lib.optionals enableStoneSense [ "-DBUILD_STONESENSE=ON" "-DSTONESENSE_INTERNAL_SO=OFF" ];

  enableParallelBuilding = true;

  passthru = { inherit version dfVersion; };

  meta = with stdenv.lib; {
    description = "Memory hacking library for Dwarf Fortress and a set of tools that use it";
    homepage = https://github.com/DFHack/dfhack/;
    license = licenses.zlib;
    platforms = [ "x86_64-linux" "i686-linux" ];
    maintainers = with maintainers; [ robbinch a1russell abbradar numinit ];
  };
}