nixpkgs/nixos/doc/manual/default.nix

{ pkgs, options, version, revision }:

with pkgs;
with pkgs.lib;

let

  # Remove invisible and internal options.
  options' = filter (opt: opt.visible && !opt.internal) (optionAttrSetToDocList options);

  # Clean up declaration sites to not refer to the NixOS source tree.
  options'' = flip map options' (opt: opt // {
    declarations = map (fn: stripPrefix fn) opt.declarations;
  });

  prefix = toString ../../..;

  stripPrefix = fn:
    if substring 0 (stringLength prefix) fn == prefix then
      substring (stringLength prefix + 1) 1000 fn
    else
      fn;

  optionsXML = builtins.toFile "options.xml" (builtins.unsafeDiscardStringContext (builtins.toXML options''));

  optionsDocBook = runCommand "options-db.xml" {} ''
    if grep /nixpkgs/nixos/modules ${optionsXML}; then
      echo "The manual appears to depend on the location of Nixpkgs, which is bad"
      echo "since this prevents sharing via the NixOS channel.  This is typically"
      echo "caused by an option default that refers to a relative path (see above"
      echo "for hints about the offending path)."
      exit 1
    fi
    ${libxslt}/bin/xsltproc \
      --stringparam revision '${revision}' \
      -o $out ${./options-to-docbook.xsl} ${optionsXML}
  '';

  sources = sourceFilesBySuffices ./. [".xml"];

  copySources =
    ''
      cp -prd $sources/* . # */
      ln -s ${optionsDocBook} options-db.xml
      echo "${version}" > version
    '';

in rec {

  # Generate the NixOS manual.
  manual = stdenv.mkDerivation {
    name = "nixos-manual";

    inherit sources;

    buildInputs = [ libxml2 libxslt ];

    buildCommand = ''
      ${copySources}

      # Check the validity of the manual sources.
      xmllint --noout --nonet --xinclude --noxincludenode \
        --relaxng ${docbook5}/xml/rng/docbook/docbook.rng \
        manual.xml

      # Generate the HTML manual.
      dst=$out/share/doc/nixos
      mkdir -p $dst
      xsltproc \
        --param section.autolabel 1 \
        --param section.label.includes.component.label 1 \
        --stringparam html.stylesheet style.css \
        --param xref.with.number.and.title 1 \
        --param toc.section.depth 3 \
        --stringparam admon.style "" \
        --stringparam callout.graphics.extension .gif \
        --param chunk.section.depth 1 \
        --param chunk.first.sections 1 \
        --param use.id.as.filename 1 \
        --stringparam generate.toc "book toc chapter toc appendix toc" \
        --nonet --xinclude --output $dst/ \
        ${docbook5_xsl}/xml/xsl/docbook/xhtml/chunkfast.xsl ./manual.xml

      mkdir -p $dst/images/callouts
      cp ${docbook5_xsl}/xml/xsl/docbook/images/callouts/*.gif $dst/images/callouts/

      cp ${./style.css} $dst/style.css

      mkdir -p $out/nix-support
      echo "nix-build out $out" >> $out/nix-support/hydra-build-products
      echo "doc manual $dst manual.html" >> $out/nix-support/hydra-build-products
    ''; # */

    meta.description = "The NixOS manual in HTML format";
  };

  manualPDF = stdenv.mkDerivation {
    name = "nixos-manual-pdf";

    inherit sources;

    buildInputs = [ libxml2 libxslt dblatex tetex ];

    buildCommand = ''
      # TeX needs a writable font cache.
      export VARTEXFONTS=$TMPDIR/texfonts

      ${copySources}

      dst=$out/share/doc/nixos
      mkdir -p $dst
      xmllint --xinclude manual.xml | dblatex -o $dst/manual.pdf - \
        -P doc.collab.show=0 \
        -P latex.output.revhistory=0

      mkdir -p $out/nix-support
      echo "doc-pdf manual $dst/manual.pdf" >> $out/nix-support/hydra-build-products
    ''; # */
  };

  # Generate the NixOS manpages.
  manpages = stdenv.mkDerivation {
    name = "nixos-manpages";

    inherit sources;

    buildInputs = [ libxml2 libxslt ];

    buildCommand = ''
      ${copySources}

      # Check the validity of the manual sources.
      xmllint --noout --nonet --xinclude --noxincludenode \
        --relaxng ${docbook5}/xml/rng/docbook/docbook.rng \
        ./man-pages.xml

      # Generate manpages.
      mkdir -p $out/share/man
      xsltproc --nonet --xinclude \
        --param man.output.in.separate.dir 1 \
        --param man.output.base.dir "'$out/share/man/'" \
        --param man.endnotes.are.numbered 0 \
        ${docbook5_xsl}/xml/xsl/docbook/manpages/docbook.xsl \
        ./man-pages.xml
    '';
  };

}