{ lib, stdenv, fetchurl, fetchpatch, perl
, enableGhostscript ? false
, ghostscript, gawk, libX11, libXaw, libXt, libXmu # for postscript and html output
, enableHtml ? false, psutils, netpbm # for html output
, enableIconv ? false, iconv
, enableLibuchardet ? false, libuchardet # for detecting input file encoding in preconv(1)
, buildPackages
, autoreconfHook
, pkg-config
, texinfo
, bison
, bash
}:

stdenv.mkDerivation rec {
  pname = "groff";
  version = "1.23.0";

  src = fetchurl {
    url = "mirror://gnu/groff/${pname}-${version}.tar.gz";
    hash = "sha256-a5dX9ZK3UYtJAutq9+VFcL3Mujeocf3bLTCuOGNRHBM=";
  };

  outputs = [ "out" "man" "doc" "info" "perl" ];

  enableParallelBuilding = true;

  postPatch = ''
    # BASH_PROG gets replaced with a path to the build bash which doesn't get automatically patched by patchShebangs
    substituteInPlace contrib/gdiffmk/gdiffmk.sh \
      --replace "@BASH_PROG@" "/bin/sh"
  '' + lib.optionalString enableHtml ''
    substituteInPlace src/preproc/html/pre-html.cpp \
      --replace "psselect" "${psutils}/bin/psselect" \
      --replace "pnmcut" "${lib.getBin netpbm}/bin/pnmcut" \
      --replace "pnmcrop" "${lib.getBin netpbm}/bin/pnmcrop" \
      --replace "pnmtopng" "${lib.getBin netpbm}/bin/pnmtopng"
    substituteInPlace tmac/www.tmac.in \
      --replace "pnmcrop" "${lib.getBin netpbm}/bin/pnmcrop" \
      --replace "pngtopnm" "${lib.getBin netpbm}/bin/pngtopnm" \
      --replace "@PNMTOPS_NOSETPAGE@" "${lib.getBin netpbm}/bin/pnmtops -nosetpage"
  '' + lib.optionalString (enableGhostscript || enableHtml) ''
    substituteInPlace contrib/pdfmark/pdfroff.sh \
      --replace '$GROFF_GHOSTSCRIPT_INTERPRETER' "${lib.getBin ghostscript}/bin/gs" \
      --replace '$GROFF_AWK_INTERPRETER' "${lib.getBin gawk}/bin/gawk"
  '';

  strictDeps = true;
  nativeBuildInputs = [ autoreconfHook pkg-config texinfo ]
    # Required due to the patch that changes .ypp files.
    ++ lib.optional (stdenv.cc.isClang && lib.versionAtLeast stdenv.cc.version "9") bison;
  buildInputs = [ perl bash ]
    ++ lib.optionals enableGhostscript [ ghostscript gawk libX11 libXaw libXt libXmu ]
    ++ lib.optionals enableHtml [ psutils netpbm ]
    ++ lib.optionals enableIconv [ iconv ]
    ++ lib.optionals enableLibuchardet [ libuchardet ];

  # Builds running without a chroot environment may detect the presence
  # of /usr/X11 in the host system, leading to an impure build of the
  # package. To avoid this issue, X11 support is explicitly disabled.
  configureFlags = lib.optionals (!enableGhostscript) [
    "--without-x"
  ] ++ [
    "ac_cv_path_PERL=${buildPackages.perl}/bin/perl"
  ] ++ lib.optionals enableGhostscript [
    "--with-gs=${lib.getBin ghostscript}/bin/gs"
    "--with-awk=${lib.getBin gawk}/bin/gawk"
    "--with-appresdir=${placeholder "out"}/lib/X11/app-defaults"
  ] ++ lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform) [
    "gl_cv_func_signbit=yes"
  ];

  makeFlags = lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform) [
    # Trick to get the build system find the proper 'native' groff
    # http://www.mail-archive.com/bug-groff@gnu.org/msg01335.html
    "GROFF_BIN_PATH=${buildPackages.groff}/bin"
    "GROFFBIN=${buildPackages.groff}/bin/groff"
  ];

  doCheck = true;

  postInstall = ''
    for f in 'man.local' 'mdoc.local'; do
        cat '${./site.tmac}' >>"$out/share/groff/site-tmac/$f"
    done

    moveToOutput bin/gropdf $perl
    moveToOutput bin/pdfmom $perl
    moveToOutput bin/roff2text $perl
    moveToOutput bin/roff2pdf $perl
    moveToOutput bin/roff2ps $perl
    moveToOutput bin/roff2dvi $perl
    moveToOutput bin/roff2ps $perl
    moveToOutput bin/roff2html $perl
    moveToOutput bin/glilypond $perl
    moveToOutput bin/mmroff $perl
    moveToOutput bin/roff2x $perl
    moveToOutput bin/afmtodit $perl
    moveToOutput bin/gperl $perl
    moveToOutput bin/chem $perl

    moveToOutput bin/gpinyin $perl
    moveToOutput lib/groff/gpinyin $perl
    substituteInPlace $perl/bin/gpinyin \
      --replace $out/lib/groff/gpinyin $perl/lib/groff/gpinyin

    moveToOutput bin/grog $perl
    moveToOutput lib/groff/grog $perl
    substituteInPlace $perl/bin/grog \
      --replace $out/lib/groff/grog $perl/lib/groff/grog

    find $perl/ -type f -print0 | xargs --null sed -i 's|${buildPackages.perl}|${perl}|'
  '';

  meta = with lib; {
    homepage = "https://www.gnu.org/software/groff/";
    description = "GNU Troff, a typesetting package that reads plain text and produces formatted output";
    license = licenses.gpl3Plus;
    platforms = platforms.all;
    maintainers = with maintainers; [ pSub ];

    longDescription = ''
      groff is the GNU implementation of troff, a document formatting
      system.  Included in this release are implementations of troff,
      pic, eqn, tbl, grn, refer, -man, -mdoc, -mom, and -ms macros,
      and drivers for PostScript, TeX dvi format, HP LaserJet 4
      printers, Canon CAPSL printers, HTML and XHTML format (beta
      status), and typewriter-like devices.  Also included is a
      modified version of the Berkeley -me macros, the enhanced
      version gxditview of the X11 xditview previewer, and an
      implementation of the -mm macros.
    '';

    outputsToInstall = [ "out" "perl" ];
  };
}