{ stdenv, fetchgit, php, flex, makeWrapper }:

let
  libphutil = fetchgit {
    url    = "git://github.com/facebook/libphutil.git";
    rev    = "6c29d5c8d169084927df75b18761312195080550";
    sha256 = "5891e5d7688a2f026e02a2684a2002c0715f0492fd8475bdcb8fab2066eff37a";
  };
  arcanist = fetchgit {
    url    = "git://github.com/facebook/arcanist.git";
    rev    = "a70a00a960ff4a7e30e20b4db1c68c081f16eaa0";
    sha256 = "37d9b80fbfc694df86a4bf75a540f81aa2e65f463d301d1f8a5930ecae8ba9fc";
  };
in
stdenv.mkDerivation rec {
  name    = "arcanist-${version}";
  version = "20140924";

  src = [ arcanist libphutil ];
  buildInputs = [ php makeWrapper flex ];

  unpackPhase = "true";
  buildPhase = ''
    ORIG=`pwd`
    cp -R ${libphutil} libphutil
    cp -R ${arcanist} arcanist
    chmod +w -R libphutil arcanist
    cd libphutil/support/xhpast
    make clean all install
    cd $ORIG
  '';
  installPhase = ''
    mkdir -p $out/bin $out/libexec
    cp -R libphutil $out/libexec/libphutil
    cp -R arcanist  $out/libexec/arcanist

    ln -s $out/libexec/arcanist/bin/arc $out/bin
    wrapProgram $out/bin/arc \
      --prefix PATH : "${php}/bin"
  '';

  meta = {
    description = "Command line interface to Phabricator";
    homepage    = "http://phabricator.org";
    license     = stdenv.lib.licenses.asl20;
    platforms   = stdenv.lib.platforms.unix;
    maintainers = [ stdenv.lib.maintainers.thoughtpolice ];
  };
}