{ fetchurl, stdenv, python2

, enableStandardFeatures ? false
, sourceHighlight ? null
, highlight ? null
, pygments ? null
, graphviz ? null
, tetex ? null
, dblatexFull ? null
, libxslt ? null
, w3m ? null
, lynx ? null
, imagemagick ? null
, lilypond ? null
, libxml2 ? null
, docbook_xml_dtd_45 ? null
, docbook5_xsl ? null
, docbook_xsl ? null
, fop ? null
# TODO: Package this:
#, epubcheck ? null
, gnused ? null
, coreutils ? null

# if true, enable all the below filters and backends
, enableExtraPlugins ? false

# unzip is needed to extract filter and backend plugins
, unzip ? null
# filters
, enableDitaaFilter ? false, jre ? null
, enableMscgenFilter ? false, mscgen ? null
, enableDiagFilter ? false, blockdiag ? null, seqdiag ? null, actdiag ? null, nwdiag ? null
, enableQrcodeFilter ? false, qrencode ? null
, enableMatplotlibFilter ? false, matplotlib ? null, numpy ? null
, enableAafigureFilter ? false, aafigure ? null, recursivePthLoader ? null
# backends
, enableDeckjsBackend ? false
, enableOdfBackend ? false
}:

assert enableStandardFeatures ->
  sourceHighlight != null &&
  highlight != null &&
  pygments != null &&
  graphviz != null &&
  tetex != null &&
  dblatexFull != null &&
  libxslt != null &&
  w3m != null &&
  lynx != null &&
  imagemagick != null &&
  lilypond != null &&
  libxml2 != null &&
  docbook_xml_dtd_45 != null &&
  docbook5_xsl != null &&
  docbook_xsl != null &&
  fop != null &&
# TODO: Package this:
#  epubcheck != null &&
  gnused != null &&
  coreutils != null;

# filters
assert enableExtraPlugins || enableDitaaFilter || enableMscgenFilter || enableDiagFilter || enableQrcodeFilter || enableAafigureFilter -> unzip != null;
assert enableExtraPlugins || enableDitaaFilter -> jre != null;
assert enableExtraPlugins || enableMscgenFilter -> mscgen != null;
assert enableExtraPlugins || enableDiagFilter -> blockdiag != null && seqdiag != null && actdiag != null && nwdiag != null;
assert enableExtraPlugins || enableMatplotlibFilter -> matplotlib != null && numpy != null;
assert enableExtraPlugins || enableAafigureFilter -> aafigure != null && recursivePthLoader != null;
# backends
assert enableExtraPlugins || enableDeckjsBackend || enableOdfBackend -> unzip != null;

let

  _enableDitaaFilter = enableExtraPlugins || enableDitaaFilter;
  _enableMscgenFilter = enableExtraPlugins || enableMscgenFilter;
  _enableDiagFilter = enableExtraPlugins || enableDiagFilter;
  _enableQrcodeFilter = enableExtraPlugins || enableQrcodeFilter;
  _enableMatplotlibFilter = enableExtraPlugins || enableMatplotlibFilter;
  _enableAafigureFilter = enableExtraPlugins || enableAafigureFilter;
  _enableDeckjsBackend = enableExtraPlugins || enableDeckjsBackend;
  _enableOdfBackend = enableExtraPlugins || enableOdfBackend;

  #
  # filters
  #

  ditaaFilterSrc = fetchurl {
    url = "https://asciidoc-ditaa-filter.googlecode.com/files/ditaa-filter-1.1.zip";
    sha256 = "0p7hm2a1xywx982ia3vg4c0lam5sz0xknsc10i2a5vswy026naf6";
  };

  mscgenFilterSrc = fetchurl {
    url = "https://asciidoc-mscgen-filter.googlecode.com/files/mscgen-filter-1.2.zip";
    sha256 = "1nfwmj375gpv5dn9i770pjv59aihzy2kja0fflsk96xwnlqsqq61";
  };

  diagFilterSrc = fetchurl {
    # unfortunately no version number
    url = "https://asciidoc-diag-filter.googlecode.com/files/diag_filter.zip";
    sha256 = "1qlqrdbqkdqqgfdhjsgdws1al0sacsyq6jmwxdfy7r8k7bv7n7mm";
  };

  qrcodeFilterSrc = fetchurl {
    url = "https://asciidoc-qrencode-filter.googlecode.com/files/qrcode-filter-1.0.zip";
    sha256 = "0h4bql1nb4y4fmg2yvlpfjhvy22ln8jsaxdr10f8bfcg5lr0zkxs";
  };

  # there are no archives or tags, using latest commit in master branch as per 2013-09-22
  matplotlibFilterSrc = let commit = "75f0d009629f93f33fab04b83faca20cc35dd358"; in fetchurl rec {
    name = "mplw-${commit}.tar.gz";
    url = "https://api.github.com/repos/lvv/mplw/tarball/${commit}";
    sha256 = "0yfhkm2dr8gnp0fcg25x89hwiymkri2m5cyqzmzragzwj0hbmcf1";
  };

  aafigureFilterSrc = fetchurl {
    url = "https://asciidoc-aafigure-filter.googlecode.com/files/aafigure-filter-1.1.zip";
    sha256 = "1hq2s30dvmv5dqvj0xm1qwdwafhgm9w1iyr0lr0c40cyk8h00j8j";
  };

  #
  # backends
  #

  deckjsBackendSrc = fetchurl {
    url = "https://github.com/downloads/houqp/asciidoc-deckjs/deckjs-1.6.2.zip";
    sha256 = "1siy1j8naj5irrrrv5bfgl4d8nal6j9pyahy4f50wmrr9wv59s46";
  };

  # the odf backend is actually two plugins: odt + odp
  odtBackendSrc = fetchurl {
    url = "https://github.com/downloads/dagwieers/asciidoc-odf/odt-backend-0.1.zip";
    sha256 = "1zaa97h9sx6ncxcdkl1x3ggydi7f8kjgvrnpjnkjiizi45k350kw";
  };
  odpBackendSrc = fetchurl {
    url = "https://github.com/downloads/dagwieers/asciidoc-odf/odp-backend-0.1.zip";
    sha256 = "08ya4bskygzqkfqwjllpg31qc5k08xp2k78z9b2480g8y57bfy10";
  };

in

stdenv.mkDerivation rec {
  name = "asciidoc-8.6.9";

  src = fetchurl {
    url = "mirror://sourceforge/asciidoc/${name}.tar.gz";
    sha256 = "1w71nk527lq504njmaf0vzr93pgahkgzzxzglrq6bay8cw2rvnvq";
  };

  buildInputs = [ python2 unzip ];

  # install filters early, so their shebangs are patched too
  patchPhase = with stdenv.lib; ''
    mkdir -p "$out/etc/asciidoc/filters"
    mkdir -p "$out/etc/asciidoc/backends"
  '' + optionalString _enableDitaaFilter ''
    echo "Extracting ditaa filter"
    unzip -d "$out/etc/asciidoc/filters/ditaa" "${ditaaFilterSrc}"
    sed -i -e "s|java -jar|${jre}/bin/java -jar|" \
        "$out/etc/asciidoc/filters/ditaa/ditaa2img.py"
  '' + optionalString _enableMscgenFilter ''
    echo "Extracting mscgen filter"
    unzip -d "$out/etc/asciidoc/filters/mscgen" "${mscgenFilterSrc}"
    sed -i -e "s|filter-wrapper.py mscgen|filter-wrapper.py ${mscgen}/bin/mscgen|" \
        "$out/etc/asciidoc/filters/mscgen/mscgen-filter.conf"
  '' + optionalString _enableDiagFilter ''
    echo "Extracting diag filter"
    unzip -d "$out/etc/asciidoc/filters/diag" "${diagFilterSrc}"
    sed -i \
        -e "s|filter='blockdiag|filter=\'${blockdiag}/bin/blockdiag|" \
        -e "s|filter='seqdiag|filter=\'${seqdiag}/bin/seqdiag|" \
        -e "s|filter='actdiag|filter=\'${actdiag}/bin/actdiag|" \
        -e "s|filter='nwdiag|filter=\'${nwdiag}/bin/nwdiag|" \
        -e "s|filter='packetdiag|filter=\'${nwdiag}/bin/packetdiag|" \
        "$out/etc/asciidoc/filters/diag/diag-filter.conf"
  '' + optionalString _enableQrcodeFilter ''
    echo "Extracting qrcode filter"
    unzip -d "$out/etc/asciidoc/filters/qrcode" "${qrcodeFilterSrc}"
    sed -i -e "s|systemcmd('qrencode|systemcmd('${qrencode}/bin/qrencode|" \
        "$out/etc/asciidoc/filters/qrcode/qrcode2img.py"
  '' + optionalString _enableMatplotlibFilter ''
    echo "Extracting mpl (matplotlib) filter"
    mkdir -p "$out/etc/asciidoc/filters/mpl"
    tar xvf "${matplotlibFilterSrc}" -C "$out/etc/asciidoc/filters/mpl" --strip-components=1
    # Stop asciidoc from loading mpl/.old/chart-filter.conf
    rm -rf "$out/etc/asciidoc/filters/mpl/.old"
    # Add matplotlib and numpy to sys.path
    matplotlib_path="$(toPythonPath ${matplotlib})"
    numpy_path="$(toPythonPath ${numpy})"
    sed -i "/^import.*sys/asys.path.append(\"$matplotlib_path\"); sys.path.append(\"$numpy_path\");" \
        "$out/etc/asciidoc/filters/mpl/mplw.py"
  '' + optionalString _enableAafigureFilter ''
    echo "Extracting aafigure filter"
    unzip -d "$out/etc/asciidoc/filters/aafigure" "${aafigureFilterSrc}"
    # Add aafigure to sys.path (and it needs recursive-pth-loader)
    pth_loader_path="$(toPythonPath ${recursivePthLoader})"
    aafigure_path="$(toPythonPath ${aafigure})"
    sed -i "/^import.*sys/asys.path.append(\"$pth_loader_path\"); sys.path.append(\"$aafigure_path\"); import sitecustomize" \
        "$out/etc/asciidoc/filters/aafigure/aafig2img.py"
  '' + optionalString _enableDeckjsBackend ''
    echo "Extracting deckjs backend"
    unzip -d "$out/etc/asciidoc/backends/deckjs" "${deckjsBackendSrc}"
  '' + optionalString _enableOdfBackend ''
    echo "Extracting odf backend (odt + odp)"
    unzip -d "$out/etc/asciidoc/backends/odt" "${odtBackendSrc}"
    unzip -d "$out/etc/asciidoc/backends/odp" "${odpBackendSrc}"
    # The odt backend has a TODO note about removing this hardcoded path, but
    # the odp backend already has that fix. Copy it here until fixed upstream.
    sed -i "s|'/etc/asciidoc/backends/odt/asciidoc.ott'|os.path.dirname(__file__),'asciidoc.ott'|" \
        "$out/etc/asciidoc/backends/odt/a2x-backend.py"
  '' + optionalString enableStandardFeatures ''
    sed -e "s|dot|${graphviz}/bin/dot|g" \
        -e "s|neato|${graphviz}/bin/neato|g" \
        -e "s|twopi|${graphviz}/bin/twopi|g" \
        -e "s|circo|${graphviz}/bin/circo|g" \
        -e "s|fdp|${graphviz}/bin/fdp|g" \
        -i "filters/graphviz/graphviz2png.py"

    sed -e "s|run('latex|run('${tetex}/bin/latex|g" \
        -e "s|cmd = 'dvipng'|cmd = '${tetex}/bin/dvipng'|g" \
        -i "filters/latex/latex2png.py"

    sed -e "s|run('abc2ly|run('${lilypond}/bin/abc2ly|g" \
        -e "s|run('lilypond|run('${lilypond}/bin/lilypond|g" \
        -e "s|run('convert|run('${imagemagick.out}/bin/convert|g" \
        -i "filters/music/music2png.py"

    sed -e 's|filter="source-highlight|filter="${sourceHighlight}/bin/source-highlight|' \
        -e 's|filter="highlight|filter="${highlight}/bin/highlight|' \
        -e 's|filter="pygmentize|filter="${pygments}/bin/pygmentize|' \
        -i "filters/source/source-highlight-filter.conf"

    # ENV is custom environment passed to programs that a2x invokes. Here we
    # use it to work around an impurity in the tetex package; tetex tools
    # cannot find their neighbours (e.g. pdflatex doesn't find mktextfm).
    # We can remove PATH= when those impurities are fixed.
    sed -e "s|^ENV =.*|ENV = dict(XML_CATALOG_FILES='${docbook_xml_dtd_45}/xml/dtd/docbook/catalog.xml ${docbook5_xsl}/xml/xsl/docbook/catalog.xml ${docbook_xsl}/xml/xsl/docbook/catalog.xml', PATH='${stdenv.lib.makeBinPath [ tetex coreutils gnused ]}')|" \
        -e "s|^ASCIIDOC =.*|ASCIIDOC = '$out/bin/asciidoc'|" \
        -e "s|^XSLTPROC =.*|XSLTPROC = '${libxslt.bin}/bin/xsltproc'|" \
        -e "s|^DBLATEX =.*|DBLATEX = '${dblatexFull}/bin/dblatex'|" \
        -e "s|^FOP =.*|FOP = '${fop}/bin/fop'|" \
        -e "s|^W3M =.*|W3M = '${w3m}/bin/w3m'|" \
        -e "s|^LYNX =.*|LYNX = '${lynx}/bin/lynx'|" \
        -e "s|^XMLLINT =.*|XMLLINT = '${libxml2.bin}/bin/xmllint'|" \
        -e "s|^EPUBCHECK =.*|EPUBCHECK = 'nixpkgs_is_missing_epubcheck'|" \
        -i a2x.py
  '' + ''
    for n in $(find "$out" . -name \*.py); do
      sed -i -e "s,^#![[:space:]]*.*/bin/env python,#!${python2}/bin/python,g" "$n"
      chmod +x "$n"
    done

    sed -i -e "s,/etc/vim,,g" Makefile.in
  '';

  preInstall = "mkdir -p $out/etc/vim";
  makeFlags = if stdenv.isCygwin then "DESTDIR=/." else null;

  meta = with stdenv.lib; {
    description = "Text-based document generation system";
    longDescription = ''
      AsciiDoc is a text document format for writing notes, documentation,
      articles, books, ebooks, slideshows, web pages, man pages and blogs.
      AsciiDoc files can be translated to many formats including HTML, PDF,
      EPUB, man page.

      AsciiDoc is highly configurable: both the AsciiDoc source file syntax and
      the backend output markups (which can be almost any type of SGML/XML
      markup) can be customized and extended by the user.
    '';
    homepage = "http://www.methods.co.nz/asciidoc/";
    license = licenses.gpl2Plus;
    platforms = platforms.unix;
    maintainers = [ maintainers.bjornfor ];
  };
}