{ lib, stdenv, fetchFromGitHub, unzip, zip, libiconv, perl, aspell, dos2unix
, singleWordlist ? null
}:

stdenv.mkDerivation rec {
  pname = "scowl";
  version = "2020.12.07";

  src = fetchFromGitHub {
    owner = "en-wl";
    repo = "wordlist";
    rev = "rel-${version}";
    sha256 = "sha256-J61jhpnZcXMnoGlSuSCrKDZnnyp3Snjr+fUpTVKX64g=";
  };

  postPatch = ''
    substituteInPlace scowl/src/Makefile \
        --replace g++ c++
  '';

  nativeBuildInputs = [ unzip zip perl aspell dos2unix ];
  buildInputs = lib.optional (!stdenv.isLinux) libiconv;

  NIX_CFLAGS_COMPILE = "-Wno-narrowing";

  preConfigure = ''
    patchShebangs .
    export PERL5LIB="$PERL5LIB''${PERL5LIB:+:}$PWD/varcon"
  '';

  postBuild = lib.optionalString (singleWordlist == null) ''
    (
    cd scowl/speller
    make aspell
    make hunspell
    )
  '';

  enableParallelBuilding = false;

  installPhase = if singleWordlist == null then ''
    eval "$preInstall"

    mkdir -p "$out/share/scowl"
    mkdir -p "$out/lib" "$out/share/hunspell" "$out/share/myspell"
    mkdir -p "$out/share/dict"

    cp -r scowl/speller/aspell "$out/lib/aspell"
    cp scowl/speller/*.{aff,dic} "$out/share/hunspell"
    ln -s "$out/share/hunspell" "$out/share/myspell/dicts"

    cp scowl/final/* "$out/share/scowl"

    (
      cd scowl
      for region in american british british_s british_z canadian australian; do
        case $region in
          american)
            regcode=en-us;
            ;;
          british)
            regcode=en-gb-ise;
            ;;
          british_s)
            regcode=en-gb-ise;
            ;;
          british_z)
            regcode=en-gb-ize;
            ;;
          canadian)
            regcode=en-ca;
            ;;
          australian)
            regcode=en-au;
            ;;
        esac
        regcode_var="$regcode"
        if test "$region" = british; then
          regcode_var="en-gb"
        fi

        echo $region $regcode $regcode_sz
        for s in 10 20 30 35 40 50 55 60 70 80 90 95; do
          ./mk-list $regcode $s > "$out/share/dict/w$region.$s"
          ./mk-list --variants=1 $regcode_var $s > "$out/share/dict/w$region.variants.$s"
          ./mk-list --variants=2 $regcode_var $s > "$out/share/dict/w$region.acceptable.$s"
        done
        ./mk-list $regcode 60 > "$out/share/dict/w$region.txt"
        ./mk-list --variants=1 $regcode_var 60 > "$out/share/dict/w$region.variants.txt"
        ./mk-list --variants=2 $regcode_var 80 > "$out/share/dict/w$region.scrabble.txt"
      done
      ./mk-list --variants=1 en-gb 60 > "$out/share/dict/words.variants.txt"
      ./mk-list --variants=1 en-gb 80 > "$out/share/dict/words.scrabble.txt"
      ./mk-list en-gb-ise 60 > "$out/share/dict/words.txt"
    )

    eval "$postInstall"
  '' else ''
    mkdir -p "$out/share/dict"
    cd scowl
    ./mk-list ${singleWordlist} > "$out/share/dict/words.txt"
  '';

  meta = {
    description = "Spell checker oriented word lists";
    license = lib.licenses.mit;
    maintainers = [lib.maintainers.raskin];
    platforms = lib.platforms.unix;
    homepage = "http://wordlist.aspell.net/";
  };
}