{ stdenv, fetchurl, lib
, autoconf, automake, gnum4, libtool, perl, gnulib, uthash, pkgconfig, gettext
, python, freetype, zlib, glib, libungif, libpng, libjpeg, libtiff, libxml2, cairo, pango
, readline, woff2, zeromq
, withSpiro ? false, libspiro
, withGTK ? false, gtk2
, withPython ? true
, withExtras ? true
, Carbon ? null, Cocoa ? null
}:

stdenv.mkDerivation rec {
  pname = "fontforge";
  version = "20190413";

  src = fetchurl {
    url = "https://github.com/${pname}/${pname}/releases/download/${version}/${pname}-${version}.tar.gz";
    sha256 = "05v640mnk4fy4jzmxb6c4n4qm800x7hy4sl5gcdgzmm3md2s0qk7";
  };

  patches = [ ./fontforge-20140813-use-system-uthash.patch ];

  # use $SOURCE_DATE_EPOCH instead of non-deterministic timestamps
  postPatch = ''
    find . -type f -name '*.c' -exec sed -r -i 's#\btime\(&(.+)\)#if (getenv("SOURCE_DATE_EPOCH")) \1=atol(getenv("SOURCE_DATE_EPOCH")); else &#g' {} \;
    sed -r -i 's#author\s*!=\s*NULL#& \&\& !getenv("SOURCE_DATE_EPOCH")#g'                            fontforge/cvexport.c fontforge/dumppfa.c fontforge/print.c fontforge/svg.c fontforge/splineutil2.c
    sed -r -i 's#\bb.st_mtime#getenv("SOURCE_DATE_EPOCH") ? atol(getenv("SOURCE_DATE_EPOCH")) : &#g'  fontforge/parsepfa.c fontforge/sfd.c fontforge/svg.c
    sed -r -i 's#^\s*ttf_fftm_dump#if (!getenv("SOURCE_DATE_EPOCH")) ttf_fftm_dump#g'                 fontforge/tottf.c
    sed -r -i 's#sprintf\(.+ author \);#if (!getenv("SOURCE_DATE_EPOCH")) &#g'                        fontforgeexe/fontinfo.c
  '';

  # do not use x87's 80-bit arithmetic, rouding errors result in very different font binaries
  NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isi686 "-msse2 -mfpmath=sse";

  nativeBuildInputs = [ pkgconfig autoconf automake gnum4 libtool perl gettext ];
  buildInputs = [
    readline uthash woff2 zeromq
    python freetype zlib glib libungif libpng libjpeg libtiff libxml2
  ]
    ++ lib.optionals withSpiro [libspiro]
    ++ lib.optionals withGTK [ gtk2 cairo pango ]
    ++ lib.optionals stdenv.isDarwin [ Carbon Cocoa ];

    configureFlags = [ "--enable-woff2" ]
    ++ lib.optionals (!withPython) [ "--disable-python-scripting" "--disable-python-extension" ]
    ++ lib.optional withGTK "--enable-gtk2-use"
    ++ lib.optional (!withGTK) "--without-x"
    ++ lib.optional withExtras "--enable-fontforge-extras";

  # work-around: git isn't really used, but configuration fails without it
  preConfigure = ''
    # The way $version propagates to $version of .pe-scripts (https://github.com/dejavu-fonts/dejavu-fonts/blob/358190f/scripts/generate.pe#L19)
    export SOURCE_DATE_EPOCH=$(date -d ${version} +%s)

    export GIT="$(type -P true)"
    cp -r "${gnulib}" ./gnulib
    chmod +w -R ./gnulib
    ./bootstrap --skip-git --gnulib-srcdir=./gnulib --force
  '';

  doCheck = false; # tries to wget some fonts
  doInstallCheck = doCheck;

  postInstall =
    # get rid of the runtime dependency on python
    lib.optionalString (!withPython) ''
      rm -r "$out/share/fontforge/python"
    '';

  enableParallelBuilding = true;

  meta = {
    description = "A font editor";
    homepage = http://fontforge.github.io;
    platforms = stdenv.lib.platforms.all;
    license = stdenv.lib.licenses.bsd3;
  };
}