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mirror of https://github.com/LnL7/nix-darwin.git synced 2024-09-11 12:49:18 +03:00

doc: add manual build for module options

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Daiderd Jordan 2019-05-04 15:36:05 +02:00
parent 631fd857aa
commit b85b9a4206
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7 changed files with 1051 additions and 0 deletions

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{ pkgs, options, config, version, revision, extraSources ? [] }:
with pkgs;
let
lib = pkgs.lib;
# Remove invisible and internal options.
optionsListVisible = lib.filter (opt: opt.visible && !opt.internal) (lib.optionAttrSetToDocList options);
# Replace functions by the string <function>
substFunction = x:
if builtins.isAttrs x then lib.mapAttrs (name: substFunction) x
else if builtins.isList x then map substFunction x
else if lib.isFunction x then "<function>"
else x;
# Generate DocBook documentation for a list of packages. This is
# what `relatedPackages` option of `mkOption` from
# ../../../lib/options.nix influences.
#
# Each element of `relatedPackages` can be either
# - a string: that will be interpreted as an attribute name from `pkgs`,
# - a list: that will be interpreted as an attribute path from `pkgs`,
# - an attrset: that can specify `name`, `path`, `package`, `comment`
# (either of `name`, `path` is required, the rest are optional).
genRelatedPackages = packages:
let
unpack = p: if lib.isString p then { name = p; }
else if lib.isList p then { path = p; }
else p;
describe = args:
let
title = args.title or null;
name = args.name or (lib.concatStringsSep "." args.path);
path = args.path or [ args.name ];
package = args.package or (lib.attrByPath path (throw "Invalid package attribute path `${toString path}'") pkgs);
in "<listitem>"
+ "<para><literal>${lib.optionalString (title != null) "${title} aka "}pkgs.${name} (${package.meta.name})</literal>"
+ lib.optionalString (!package.meta.available) " <emphasis>[UNAVAILABLE]</emphasis>"
+ ": ${package.meta.description or "???"}.</para>"
+ lib.optionalString (args ? comment) "\n<para>${args.comment}</para>"
# Lots of `longDescription's break DocBook, so we just wrap them into <programlisting>
+ lib.optionalString (package.meta ? longDescription) "\n<programlisting>${package.meta.longDescription}</programlisting>"
+ "</listitem>";
in "<itemizedlist>${lib.concatStringsSep "\n" (map (p: describe (unpack p)) packages)}</itemizedlist>";
optionsListDesc = lib.flip map optionsListVisible (opt: opt // {
# Clean up declaration sites to not refer to the NixOS source tree.
declarations = map stripAnyPrefixes opt.declarations;
}
// lib.optionalAttrs (opt ? example) { example = substFunction opt.example; }
// lib.optionalAttrs (opt ? default) { default = substFunction opt.default; }
// lib.optionalAttrs (opt ? type) { type = substFunction opt.type; }
// lib.optionalAttrs (opt ? relatedPackages && opt.relatedPackages != []) { relatedPackages = genRelatedPackages opt.relatedPackages; });
# We need to strip references to /nix/store/* from options,
# including any `extraSources` if some modules came from elsewhere,
# or else the build will fail.
#
# E.g. if some `options` came from modules in ${pkgs.customModules}/nix,
# you'd need to include `extraSources = [ pkgs.customModules ]`
prefixesToStrip = map (p: "${toString p}/") ([ ../../.. ] ++ extraSources);
stripAnyPrefixes = lib.flip (lib.fold lib.removePrefix) prefixesToStrip;
# Custom "less" that pushes up all the things ending in ".enable*"
# and ".package*"
optionLess = a: b:
let
ise = lib.hasPrefix "enable";
isp = lib.hasPrefix "package";
cmp = lib.splitByAndCompare ise lib.compare
(lib.splitByAndCompare isp lib.compare lib.compare);
in lib.compareLists cmp a.loc b.loc < 0;
# Customly sort option list for the man page.
optionsList = lib.sort optionLess optionsListDesc;
# Convert the list of options into an XML file.
optionsXML = builtins.toFile "options.xml" (builtins.toXML optionsList);
optionsDocBook = runCommand "options-db.xml" {} ''
optionsXML=${optionsXML}
if grep /darwin/modules $optionsXML; then
echo "The manual appears to depend on the location of Darwin, which is bad"
echo "since this prevents sharing via a 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
${buildPackages.libxslt.bin}/bin/xsltproc \
--stringparam revision '${revision}' \
-o intermediate.xml ${./options-to-docbook.xsl} $optionsXML
${buildPackages.libxslt.bin}/bin/xsltproc \
-o "$out" ${./postprocess-option-descriptions.xsl} intermediate.xml
'';
sources = lib.sourceFilesBySuffices ./. [".xml"];
modulesDoc = builtins.toFile "modules.xml" ''
<section xmlns:xi="http://www.w3.org/2001/XInclude" id="modules">
${(lib.concatMapStrings (path: ''
<xi:include href="${path}" />
'') (lib.catAttrs "value" (config.meta.doc or [])))}
</section>
'';
generatedSources = runCommand "generated-docbook" {} ''
mkdir $out
ln -s ${modulesDoc} $out/modules.xml
ln -s ${optionsDocBook} $out/options-db.xml
printf "%s" "${version}" > $out/version
'';
copySources =
''
cp -prd $sources/* . || true
ln -s ${generatedSources} ./generated
chmod -R u+w .
'';
toc = builtins.toFile "toc.xml"
''
<toc role="chunk-toc">
<d:tocentry xmlns:d="http://docbook.org/ns/docbook" linkend="book-darwin-manual"><?dbhtml filename="index.html"?>
<d:tocentry linkend="ch-options"><?dbhtml filename="options.html"?></d:tocentry>
<d:tocentry linkend="ch-release-notes"><?dbhtml filename="release-notes.html"?></d:tocentry>
</d:tocentry>
</toc>
'';
manualXsltprocOptions = toString [
"--param section.autolabel 1"
"--param section.label.includes.component.label 1"
"--stringparam html.stylesheet 'style.css overrides.css highlightjs/mono-blue.css'"
"--stringparam html.script './highlightjs/highlight.pack.js ./highlightjs/loader.js'"
"--param xref.with.number.and.title 1"
"--param toc.section.depth 3"
"--stringparam admon.style ''"
"--stringparam callout.graphics.extension .svg"
"--stringparam current.docid manual"
"--param chunk.section.depth 0"
"--param chunk.first.sections 1"
"--param use.id.as.filename 1"
"--stringparam generate.toc 'book toc appendix toc'"
"--stringparam chunk.toc ${toc}"
];
manual-combined = runCommand "darwin-manual-combined"
{ inherit sources;
nativeBuildInputs = [ buildPackages.libxml2.bin buildPackages.libxslt.bin ];
meta.description = "The NixOS manual as plain docbook XML";
}
''
${copySources}
xmllint --xinclude --output ./manual-combined.xml ./manual.xml
xmllint --xinclude --noxincludenode \
--output ./man-pages-combined.xml ./man-pages.xml
# outputs the context of an xmllint error output
# LEN lines around the failing line are printed
function context {
# length of context
local LEN=6
# lines to print before error line
local BEFORE=4
# xmllint output lines are:
# file.xml:1234: there was an error on line 1234
while IFS=':' read -r file line rest; do
echo
if [[ -n "$rest" ]]; then
echo "$file:$line:$rest"
local FROM=$(($line>$BEFORE ? $line - $BEFORE : 1))
# number lines & filter context
nl --body-numbering=a "$file" | sed -n "$FROM,+$LEN p"
else
if [[ -n "$line" ]]; then
echo "$file:$line"
else
echo "$file"
fi
fi
done
}
function lintrng {
xmllint --debug --noout --nonet \
--relaxng ${docbook5}/xml/rng/docbook/docbook.rng \
"$1" \
2>&1 | context 1>&2
# ^ redirect assumes xmllint doesnt print to stdout
}
lintrng manual-combined.xml
lintrng man-pages-combined.xml
mkdir $out
cp manual-combined.xml $out/
cp man-pages-combined.xml $out/
'';
olinkDB = runCommand "manual-olinkdb"
{ inherit sources;
nativeBuildInputs = [ buildPackages.libxml2.bin buildPackages.libxslt.bin ];
}
''
xsltproc \
${manualXsltprocOptions} \
--stringparam collect.xref.targets only \
--stringparam targets.filename "$out/manual.db" \
--nonet \
${docbook_xsl_ns}/xml/xsl/docbook/xhtml/chunktoc.xsl \
${manual-combined}/manual-combined.xml
cat > "$out/olinkdb.xml" <<EOF
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE targetset SYSTEM
"file://${docbook_xsl_ns}/xml/xsl/docbook/common/targetdatabase.dtd" [
<!ENTITY manualtargets SYSTEM "file://$out/manual.db">
]>
<targetset>
<targetsetinfo>
Allows for cross-referencing olinks between the manpages
and manual.
</targetsetinfo>
<document targetdoc="manual">&manualtargets;</document>
</targetset>
EOF
'';
in rec {
inherit generatedSources;
# The NixOS options in JSON format.
optionsJSON = runCommand "options-json"
{ meta.description = "List of NixOS options in JSON format";
}
''
# Export list of options in different format.
dst=$out/share/doc/darwin
mkdir -p $dst
cp ${builtins.toFile "options.json" (builtins.unsafeDiscardStringContext (builtins.toJSON
(builtins.listToAttrs (map (o: { name = o.name; value = removeAttrs o ["name" "visible" "internal"]; }) optionsList))))
} $dst/options.json
mkdir -p $out/nix-support
echo "file json $dst/options.json" >> $out/nix-support/hydra-build-products
''; # */
# Generate the NixOS manual.
manualHTML = runCommand "darwin-manual-html"
{ inherit sources;
nativeBuildInputs = [ buildPackages.libxml2.bin buildPackages.libxslt.bin ];
meta.description = "The Darwin manual in HTML format";
allowedReferences = ["out"];
}
''
# Generate the HTML manual.
dst=$out/share/doc/darwin
mkdir -p $dst
xsltproc \
${manualXsltprocOptions} \
--stringparam target.database.document "${olinkDB}/olinkdb.xml" \
--stringparam id.warnings "1" \
--nonet --output $dst/ \
${docbook_xsl_ns}/xml/xsl/docbook/xhtml/chunktoc.xsl \
${manual-combined}/manual-combined.xml \
|& tee xsltproc.out
grep "^ID recommended on" xsltproc.out &>/dev/null && echo "error: some IDs are missing" && false
rm xsltproc.out
mkdir -p $dst/images/callouts
cp ${docbook_xsl_ns}/xml/xsl/docbook/images/callouts/*.svg $dst/images/callouts/
cp ${./style.css} $dst/style.css
cp ${./overrides.css} $dst/overrides.css
cp -r ${pkgs.documentation-highlighter} $dst/highlightjs
mkdir -p $out/nix-support
echo "nix-build out $out" >> $out/nix-support/hydra-build-products
echo "doc manual $dst" >> $out/nix-support/hydra-build-products
''; # */
# Alias for backward compatibility. TODO(@oxij): remove eventually.
manual = manualHTML;
# Index page of the NixOS manual.
manualHTMLIndex = "${manualHTML}/share/doc/darwin/index.html";
manualEpub = runCommand "darwin-manual-epub"
{ inherit sources;
buildInputs = [ libxml2.bin libxslt.bin zip ];
}
''
# Generate the epub manual.
dst=$out/share/doc/darwin
xsltproc \
${manualXsltprocOptions} \
--stringparam target.database.document "${olinkDB}/olinkdb.xml" \
--nonet --xinclude --output $dst/epub/ \
${docbook_xsl_ns}/xml/xsl/docbook/epub/docbook.xsl \
${manual-combined}/manual-combined.xml
mkdir -p $dst/epub/OEBPS/images/callouts
cp -r ${docbook_xsl_ns}/xml/xsl/docbook/images/callouts/*.svg $dst/epub/OEBPS/images/callouts # */
echo "application/epub+zip" > mimetype
manual="$dst/darwin-manual.epub"
zip -0Xq "$manual" mimetype
cd $dst/epub && zip -Xr9D "$manual" *
rm -rf $dst/epub
mkdir -p $out/nix-support
echo "doc-epub manual $manual" >> $out/nix-support/hydra-build-products
'';
# Generate the NixOS manpages.
manpages = runCommand "darwin-manpages"
{ inherit sources;
nativeBuildInputs = [ buildPackages.libxml2.bin buildPackages.libxslt.bin ];
allowedReferences = ["out"];
}
''
# Generate manpages.
mkdir -p $out/share/man
xsltproc --nonet \
--maxdepth 6000 \
--param man.output.in.separate.dir 1 \
--param man.output.base.dir "'$out/share/man/'" \
--param man.endnotes.are.numbered 0 \
--param man.break.after.slash 1 \
--stringparam target.database.document "${olinkDB}/olinkdb.xml" \
${docbook_xsl_ns}/xml/xsl/docbook/manpages/docbook.xsl \
${manual-combined}/man-pages-combined.xml
'';
}

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<reference xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude">
<title>Darwin Reference Pages</title>
<info>
<author><personname><firstname>Daiderd</firstname><surname>Jordan</surname></personname>
<contrib>Author</contrib>
</author>
<copyright><year>2016-2019</year><holder>Daiderd Jordan</holder>
</copyright>
</info>
<refentry>
<refmeta>
<refentrytitle><filename>configuration.nix</filename>
</refentrytitle><manvolnum>5</manvolnum>
<refmiscinfo class="source">Darwin</refmiscinfo>
<!-- <refmiscinfo class="version"><xi:include href="version.txt" parse="text"/></refmiscinfo> -->
</refmeta>
<refnamediv>
<refname><filename>configuration.nix</filename>
</refname><refpurpose>Darwin system configuration specification</refpurpose>
</refnamediv>
<refsection>
<title>Description</title>
<para>
The file <filename>configuration.nix</filename> contains the
declarative specification of your Darwin system configuration. The command
<command>darwin-rebuild</command> takes this file and realises the system
configuration specified therein.
</para>
</refsection>
<refsection>
<title>Options</title>
<para>
You can use the following options in <filename>configuration.nix</filename>.
</para>
<xi:include href="./generated/options-db.xml"
xpointer="configuration-variable-list" />
</refsection>
</refentry>
</reference>

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<book xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id="book-darwin-manual">
<info>
<title>Darwin Manual</title>
<subtitle>Version <xi:include href="./generated/version" parse="text" />
</subtitle>
</info>
<preface xml:id="preface">
<title>Preface</title>
<para>Nix modules for darwin.</para>
</preface>
<chapter xml:id="sec-options">
<title>Configuration Options</title>
<xi:include href="./generated/options-db.xml"
xpointer="configuration-variable-list" />
</chapter>
</book>

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<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:str="http://exslt.org/strings"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:nixos="tag:nixos.org"
xmlns="http://docbook.org/ns/docbook"
extension-element-prefixes="str"
>
<xsl:output method='xml' encoding="UTF-8" />
<xsl:param name="revision" />
<xsl:param name="program" />
<xsl:template match="/expr/list">
<appendix xml:id="appendix-configuration-options">
<title>Configuration Options</title>
<variablelist xml:id="configuration-variable-list">
<xsl:for-each select="attrs">
<xsl:variable name="id" select="concat('opt-', str:replace(str:replace(str:replace(str:replace(attr[@name = 'name']/string/@value, '*', '_'), '&lt;', '_'), '>', '_'), '?', '_'))" />
<varlistentry>
<term xlink:href="#{$id}">
<xsl:attribute name="xml:id"><xsl:value-of select="$id"/></xsl:attribute>
<option>
<xsl:value-of select="attr[@name = 'name']/string/@value" />
</option>
</term>
<listitem>
<nixos:option-description>
<para>
<xsl:value-of disable-output-escaping="yes"
select="attr[@name = 'description']/string/@value" />
</para>
</nixos:option-description>
<xsl:if test="attr[@name = 'type']">
<para>
<emphasis>Type:</emphasis>
<xsl:text> </xsl:text>
<xsl:value-of select="attr[@name = 'type']/string/@value"/>
<xsl:if test="attr[@name = 'readOnly']/bool/@value = 'true'">
<xsl:text> </xsl:text>
<emphasis>(read only)</emphasis>
</xsl:if>
</para>
</xsl:if>
<xsl:if test="attr[@name = 'default']">
<para>
<emphasis>Default:</emphasis>
<xsl:text> </xsl:text>
<xsl:apply-templates select="attr[@name = 'default']" mode="top" />
</para>
</xsl:if>
<xsl:if test="attr[@name = 'example']">
<para>
<emphasis>Example:</emphasis>
<xsl:text> </xsl:text>
<xsl:choose>
<xsl:when test="attr[@name = 'example']/attrs[attr[@name = '_type' and string[@value = 'literalExample']]]">
<programlisting><xsl:value-of select="attr[@name = 'example']/attrs/attr[@name = 'text']/string/@value" /></programlisting>
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates select="attr[@name = 'example']" mode="top" />
</xsl:otherwise>
</xsl:choose>
</para>
</xsl:if>
<xsl:if test="attr[@name = 'relatedPackages']">
<para>
<emphasis>Related packages:</emphasis>
<xsl:text> </xsl:text>
<xsl:value-of disable-output-escaping="yes"
select="attr[@name = 'relatedPackages']/string/@value" />
</para>
</xsl:if>
<xsl:if test="count(attr[@name = 'declarations']/list/*) != 0">
<para>
<emphasis>Declared by:</emphasis>
</para>
<xsl:apply-templates select="attr[@name = 'declarations']" />
</xsl:if>
<xsl:if test="count(attr[@name = 'definitions']/list/*) != 0">
<para>
<emphasis>Defined by:</emphasis>
</para>
<xsl:apply-templates select="attr[@name = 'definitions']" />
</xsl:if>
</listitem>
</varlistentry>
</xsl:for-each>
</variablelist>
</appendix>
</xsl:template>
<xsl:template match="*" mode="top">
<xsl:choose>
<xsl:when test="string[contains(@value, '&#010;')]">
<programlisting>
<xsl:text>''
</xsl:text><xsl:value-of select='str:replace(string/@value, "${", "&apos;&apos;${")' /><xsl:text>''</xsl:text></programlisting>
</xsl:when>
<xsl:otherwise>
<literal><xsl:apply-templates /></literal>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template match="null">
<xsl:text>null</xsl:text>
</xsl:template>
<xsl:template match="string">
<xsl:choose>
<xsl:when test="(contains(@value, '&quot;') or contains(@value, '\')) and not(contains(@value, '&#010;'))">
<xsl:text>''</xsl:text><xsl:value-of select='str:replace(@value, "${", "&apos;&apos;${")' /><xsl:text>''</xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:text>"</xsl:text><xsl:value-of select="str:replace(str:replace(str:replace(str:replace(@value, '\', '\\'), '&quot;', '\&quot;'), '&#010;', '\n'), '$', '\$')" /><xsl:text>"</xsl:text>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template match="int">
<xsl:value-of select="@value" />
</xsl:template>
<xsl:template match="bool[@value = 'true']">
<xsl:text>true</xsl:text>
</xsl:template>
<xsl:template match="bool[@value = 'false']">
<xsl:text>false</xsl:text>
</xsl:template>
<xsl:template match="list">
[
<xsl:for-each select="*">
<xsl:apply-templates select="." />
<xsl:text> </xsl:text>
</xsl:for-each>
]
</xsl:template>
<xsl:template match="attrs[attr[@name = '_type' and string[@value = 'literalExample']]]">
<xsl:value-of select="attr[@name = 'text']/string/@value" />
</xsl:template>
<xsl:template match="attrs">
{
<xsl:for-each select="attr">
<xsl:value-of select="@name" />
<xsl:text> = </xsl:text>
<xsl:apply-templates select="*" /><xsl:text>; </xsl:text>
</xsl:for-each>
}
</xsl:template>
<xsl:template match="derivation">
<replaceable>(build of <xsl:value-of select="attr[@name = 'name']/string/@value" />)</replaceable>
</xsl:template>
<xsl:template match="attr[@name = 'declarations' or @name = 'definitions']">
<simplelist>
<xsl:for-each select="list/string">
<member><filename>
<!-- Hyperlink the filename either to the NixOS Subversion
repository (if its a module and we have a revision number),
or to the local filesystem. -->
<xsl:choose>
<xsl:when test="not(starts-with(@value, '/'))">
<xsl:choose>
<xsl:when test="$revision = 'local'">
<xsl:attribute name="xlink:href">https://github.com/LnL7/nix-darwin/blob/master/<xsl:value-of select="@value"/></xsl:attribute>
</xsl:when>
<xsl:otherwise>
<xsl:attribute name="xlink:href">https://github.com/LnL7/nix-darwin/blob/<xsl:value-of select="$revision"/>/<xsl:value-of select="@value"/></xsl:attribute>
</xsl:otherwise>
</xsl:choose>
</xsl:when>
<xsl:otherwise>
<xsl:attribute name="xlink:href">file://<xsl:value-of select="@value"/></xsl:attribute>
</xsl:otherwise>
</xsl:choose>
<!-- Print the filename and make it user-friendly by replacing the
/nix/store/<hash> prefix by the default location of darwin
sources. -->
<xsl:choose>
<xsl:when test="not(starts-with(@value, '/'))">
&lt;<xsl:value-of select="@value"/>&gt;
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="@value" />
</xsl:otherwise>
</xsl:choose>
</filename></member>
</xsl:for-each>
</simplelist>
</xsl:template>
<xsl:template match="function">
<xsl:text>λ</xsl:text>
</xsl:template>
</xsl:stylesheet>

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.docbook .xref img[src^=images\/callouts\/],
.screen img,
.programlisting img {
width: 1em;
}
.calloutlist img {
width: 1.5em;
}

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<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:str="http://exslt.org/strings"
xmlns:exsl="http://exslt.org/common"
xmlns:db="http://docbook.org/ns/docbook"
xmlns:nixos="tag:nixos.org"
extension-element-prefixes="str exsl">
<xsl:output method='xml' encoding="UTF-8" />
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()" />
</xsl:copy>
</xsl:template>
<xsl:template name="break-up-description">
<xsl:param name="input" />
<xsl:param name="buffer" />
<!-- Every time we have two newlines following each other, we want to
break it into </para><para>. -->
<xsl:variable name="parbreak" select="'&#xa;&#xa;'" />
<!-- Similar to "(head:tail) = input" in Haskell. -->
<xsl:variable name="head" select="$input[1]" />
<xsl:variable name="tail" select="$input[position() &gt; 1]" />
<xsl:choose>
<xsl:when test="$head/self::text() and contains($head, $parbreak)">
<!-- If the haystack provided to str:split() directly starts or
ends with $parbreak, it doesn't generate a <token/> for that,
so we are doing this here. -->
<xsl:variable name="splitted-raw">
<xsl:if test="starts-with($head, $parbreak)"><token /></xsl:if>
<xsl:for-each select="str:split($head, $parbreak)">
<token><xsl:value-of select="node()" /></token>
</xsl:for-each>
<!-- Something like ends-with($head, $parbreak), but there is
no ends-with() in XSLT, so we need to use substring(). -->
<xsl:if test="
substring($head, string-length($head) -
string-length($parbreak) + 1) = $parbreak
"><token /></xsl:if>
</xsl:variable>
<xsl:variable name="splitted"
select="exsl:node-set($splitted-raw)/token" />
<!-- The buffer we had so far didn't contain any text nodes that
contain a $parbreak, so we can put the buffer along with the
first token of $splitted into a para element. -->
<para xmlns="http://docbook.org/ns/docbook">
<xsl:apply-templates select="exsl:node-set($buffer)" />
<xsl:apply-templates select="$splitted[1]/node()" />
</para>
<!-- We have already emitted the first splitted result, so the
last result is going to be set as the new $buffer later
because its contents may not be directly followed up by a
$parbreak. -->
<xsl:for-each select="$splitted[position() &gt; 1
and position() &lt; last()]">
<para xmlns="http://docbook.org/ns/docbook">
<xsl:apply-templates select="node()" />
</para>
</xsl:for-each>
<xsl:call-template name="break-up-description">
<xsl:with-param name="input" select="$tail" />
<xsl:with-param name="buffer" select="$splitted[last()]/node()" />
</xsl:call-template>
</xsl:when>
<!-- Either non-text node or one without $parbreak, which we just
want to buffer and continue recursing. -->
<xsl:when test="$input">
<xsl:call-template name="break-up-description">
<xsl:with-param name="input" select="$tail" />
<!-- This essentially appends $head to $buffer. -->
<xsl:with-param name="buffer">
<xsl:if test="$buffer">
<xsl:for-each select="exsl:node-set($buffer)">
<xsl:apply-templates select="." />
</xsl:for-each>
</xsl:if>
<xsl:apply-templates select="$head" />
</xsl:with-param>
</xsl:call-template>
</xsl:when>
<!-- No more $input, just put the remaining $buffer in a para. -->
<xsl:otherwise>
<para xmlns="http://docbook.org/ns/docbook">
<xsl:apply-templates select="exsl:node-set($buffer)" />
</para>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template match="nixos:option-description">
<xsl:choose>
<!--
Only process nodes that are comprised of a single <para/> element,
because if that's not the case the description already contains
</para><para> in between and we need no further processing.
-->
<xsl:when test="count(db:para) > 1">
<xsl:apply-templates select="node()" />
</xsl:when>
<xsl:otherwise>
<xsl:call-template name="break-up-description">
<xsl:with-param name="input"
select="exsl:node-set(db:para/node())" />
</xsl:call-template>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>

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/* Copied from http://bakefile.sourceforge.net/, which appears
licensed under the GNU GPL. */
/***************************************************************************
Basic headers and text:
***************************************************************************/
body
{
font-family: "Nimbus Sans L", sans-serif;
font-size: 1em;
background: white;
margin: 2em 1em 2em 1em;
}
h1, h2, h3, h4
{
color: #005aa0;
}
h1 /* title */
{
font-size: 200%;
}
h2 /* chapters, appendices, subtitle */
{
font-size: 180%;
}
div.book
{
text-align: center;
}
div.book > div
{
/*
* based on https://medium.com/@zkareemz/golden-ratio-62b3b6d4282a
* we do 70 characters per line to fit code listings better
* 70 * (font-size / 1.618)
* expression for emacs:
* (* 70 (/ 1 1.618))
*/
max-width: 43.2em;
text-align: left;
margin: auto;
}
/* Extra space between chapters, appendices. */
div.chapter > div.titlepage h2, div.appendix > div.titlepage h2
{
margin-top: 1.5em;
}
div.section > div.titlepage h2 /* sections */
{
font-size: 150%;
margin-top: 1.5em;
}
h3 /* subsections */
{
font-size: 125%;
}
div.simplesect h2
{
font-size: 110%;
}
div.appendix h3
{
font-size: 150%;
margin-top: 1.5em;
}
div.refnamediv h2, div.refsynopsisdiv h2, div.refsection h2 /* refentry parts */
{
margin-top: 1.4em;
font-size: 125%;
}
div.refsection h3
{
font-size: 110%;
}
/***************************************************************************
Examples:
***************************************************************************/
div.example
{
border: 1px solid #b0b0b0;
padding: 6px 6px;
margin-left: 1.5em;
margin-right: 1.5em;
background: #f4f4f8;
border-radius: 0.4em;
box-shadow: 0.4em 0.4em 0.5em #e0e0e0;
}
div.example p.title
{
margin-top: 0em;
}
div.example pre
{
box-shadow: none;
}
/***************************************************************************
Screen dumps:
***************************************************************************/
pre.screen, pre.programlisting
{
border: 1px solid #b0b0b0;
padding: 3px 3px;
margin-left: 0.5em;
margin-right: 0.5em;
background: #f4f4f8;
font-family: monospace;
border-radius: 0.4em;
box-shadow: 0.4em 0.4em 0.5em #e0e0e0;
}
div.example pre.programlisting
{
border: 0px;
padding: 0 0;
margin: 0 0 0 0;
}
/***************************************************************************
Notes, warnings etc:
***************************************************************************/
.note, .warning
{
border: 1px solid #b0b0b0;
padding: 3px 3px;
margin-left: 1.5em;
margin-right: 1.5em;
margin-bottom: 1em;
padding: 0.3em 0.3em 0.3em 0.3em;
background: #fffff5;
border-radius: 0.4em;
box-shadow: 0.4em 0.4em 0.5em #e0e0e0;
}
div.note, div.warning
{
font-style: italic;
}
div.note h3, div.warning h3
{
color: red;
font-size: 100%;
padding-right: 0.5em;
display: inline;
}
div.note p, div.warning p
{
margin-bottom: 0em;
}
div.note h3 + p, div.warning h3 + p
{
display: inline;
}
div.note h3
{
color: blue;
font-size: 100%;
}
div.navfooter *
{
font-size: 90%;
}
/***************************************************************************
Links colors and highlighting:
***************************************************************************/
a { text-decoration: none; }
a:hover { text-decoration: underline; }
a:link { color: #0048b3; }
a:visited { color: #002a6a; }
/***************************************************************************
Table of contents:
***************************************************************************/
div.toc
{
font-size: 90%;
}
div.toc dl
{
margin-top: 0em;
margin-bottom: 0em;
}
/***************************************************************************
Special elements:
***************************************************************************/
tt, code
{
color: #400000;
}
.term
{
font-weight: bold;
}
div.variablelist dd p, div.glosslist dd p
{
margin-top: 0em;
}
div.variablelist dd, div.glosslist dd
{
margin-left: 1.5em;
}
div.glosslist dt
{
font-style: italic;
}
.varname
{
color: #400000;
}
span.command strong
{
font-weight: normal;
color: #400000;
}
div.calloutlist table
{
box-shadow: none;
}
table
{
border-collapse: collapse;
box-shadow: 0.4em 0.4em 0.5em #e0e0e0;
}
table.simplelist
{
text-align: left;
color: #005aa0;
border: 0;
padding: 5px;
background: #fffff5;
font-weight: normal;
font-style: italic;
box-shadow: none;
margin-bottom: 1em;
}
div.navheader table, div.navfooter table {
box-shadow: none;
}
div.affiliation
{
font-style: italic;
}