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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- Copyright (c) 1999 Neil Blakey-Milner, All rights reserved.
Redistribution and use in source (SGML DocBook) and 'compiled' forms
(SGML HTML, PDF, PostScript, RTF and so forth) with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code (SGML DocBook) must retain the above
copyright notice, this list of conditions and the following
disclaimer as the first lines of this file unmodified.
2. Redistributions in compiled form (transformed to other DTDs,
converted to PDF, PostScript, RTF and other formats) must reproduce
the above copyright notice, this list of conditions and the
following disclaimer in the documentation and/or other materials
provided with the distribution.
THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL NIK CLAYTON BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS DOCUMENTATION, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
$FreeBSD$
-->
<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0" xml:id="doc-build">
<title>The Documentation Build Process</title>
<para>This chapter covers organization of the documentation build
process and how &man.make.1; is used to control it.</para>
<sect1 xml:id="doc-build-rendering">
<title>Rendering DocBook into Output</title>
<para>Different types of output can be produced from a single
DocBook source file. The type of output desired is set with the
<varname>FORMATS</varname> variable. A list of known formats is
stored in <varname>KNOWN_FORMATS</varname>:</para>
<screen xml:id="doc-build-rendering-known-formats">&prompt.user; <userinput>cd ~/doc/en_US.ISO8859-1/books/handbook</userinput>
&prompt.user; <userinput>make -V KNOWN_FORMATS</userinput></screen>
<table xml:id="doc-build-rendering-common-formats" frame="none">
<title>Common Output Formats</title>
<tgroup cols="3">
<thead>
<row>
<entry><varname>FORMATS</varname> Value</entry>
<entry>File Type</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry><literal>html</literal></entry>
<entry><acronym>HTML</acronym>, one file</entry>
<entry>A single <filename>book.html</filename> or
<filename>article.html</filename>.</entry>
</row>
<row>
<entry><literal>html-split</literal></entry>
<entry><acronym>HTML</acronym>, multiple files</entry>
<entry>Multiple <acronym>HTML</acronym> files, one for
each chapter or section, for use on a typical web
site.</entry>
</row>
<row>
<entry><literal>pdf</literal></entry>
<entry><acronym>PDF</acronym></entry>
<entry>Portable Document Format</entry>
</row>
</tbody>
</tgroup>
</table>
<para>The default output format can vary by document, but is
usually <literal>html-split</literal>. Other formats are chosen
by setting <varname>FORMATS</varname> to a specific value.
Multiple output formats can be created at a single time by
setting <varname>FORMATS</varname> to a list of formats.</para>
<example xml:id="doc-build-formats-example-html">
<title>Build a Single HTML Output File</title>
<screen>&prompt.user; <userinput>cd ~/doc/en_US.ISO8859-1/books/handbook</userinput>
&prompt.user; <userinput>make FORMATS=html</userinput></screen>
</example>
<example xml:id="doc-build-formats-example-html-split-pdf">
<title>Build HTML-Split and <acronym>PDF</acronym> Output
Files</title>
<screen>&prompt.user; <userinput>cd ~/doc/en_US.ISO8859-1/books/handbook</userinput>
&prompt.user; <userinput>make FORMATS="html-split pdf"</userinput></screen>
</example>
</sect1>
<sect1 xml:id="doc-build-toolset">
<title>The &os; Documentation Build Toolset</title>
<para>These are the tools used to build and install the
<acronym>FDP</acronym> documentation.</para>
<itemizedlist>
<listitem>
<para>The primary build tool is &man.make.1;, specifically
<application>Berkeley Make</application>.</para>
</listitem>
<listitem>
<para>Package building is handled by &os;'s
&man.pkg-create.8;.</para>
</listitem>
<listitem>
<para>&man.gzip.1; is used to create compressed versions of
the document. &man.bzip2.1; archives are also supported.
&man.tar.1; is used for package building.</para>
</listitem>
<listitem>
<para>&man.install.1; is used to install the
documentation.</para>
</listitem>
</itemizedlist>
</sect1>
<sect1 xml:id="doc-build-makefiles">
<title>Understanding <filename>Makefile</filename>s in the
Documentation Tree</title>
<para>There are three main types of <filename>Makefile</filename>s
in the &os; Documentation Project tree.</para>
<itemizedlist>
<listitem>
<para><link linkend="sub-make">Subdirectory
<filename>Makefile</filename>s</link> simply pass
commands to those directories below them.</para>
</listitem>
<listitem>
<para><link linkend="doc-make">Documentation
<filename>Makefile</filename>s</link> describe the
documents that are produced from this
directory.</para>
</listitem>
<listitem>
<para><link linkend="make-includes"><application>Make</application>
includes</link> are the glue that perform the document
production, and are usually of the form
<filename>doc.<replaceable>xxx</replaceable>.mk</filename>.</para>
</listitem>
</itemizedlist>
<sect2 xml:id="sub-make">
<title>Subdirectory <filename>Makefile</filename>s</title>
<para>These <filename>Makefile</filename>s usually take the form
of:</para>
<programlisting>SUBDIR =articles
SUBDIR+=books
COMPAT_SYMLINK = en
DOC_PREFIX?= ${.CURDIR}/..
.include "${DOC_PREFIX}/share/mk/doc.project.mk"</programlisting>
<para>The first four non-empty lines define the &man.make.1;
variables <varname>SUBDIR</varname>,
<varname>COMPAT_SYMLINK</varname>, and
<varname>DOC_PREFIX</varname>.</para>
<para>The <varname>SUBDIR</varname> statement and
<varname>COMPAT_SYMLINK</varname> statement show how to
assign a value to a variable, overriding any previous
value.</para>
<para>The second <varname>SUBDIR</varname> statement shows how a
value is appended to the current value of a variable. The
<varname>SUBDIR</varname> variable is now <literal>articles
books</literal>.</para>
<para>The <varname>DOC_PREFIX</varname> assignment shows how a
value is assigned to the variable, but only if it is not
already defined. This is useful if
<varname>DOC_PREFIX</varname> is not where this
<filename>Makefile</filename> thinks it is - the user can
override this and provide the correct value.</para>
<para>What does it all mean? <varname>SUBDIR</varname>
mentions which subdirectories below this one the build process
should pass any work on to.</para>
<para><varname>COMPAT_SYMLINK</varname> is specific to
compatibility symlinks (amazingly enough) for languages to
their official encoding (<filename>doc/en</filename> would
point to <filename>en_US.ISO-8859-1</filename>).</para>
<para><varname>DOC_PREFIX</varname> is the path to the root of
the &os; Document Project tree. This is not always that easy
to find, and is also easily overridden, to allow for
flexibility. <varname>.CURDIR</varname> is a &man.make.1;
builtin variable with the path to the current
directory.</para>
<para>The final line includes the &os; Documentation Project's
project-wide &man.make.1; system file
<filename>doc.project.mk</filename> which is the glue which
converts these variables into build instructions.</para>
</sect2>
<sect2 xml:id="doc-make">
<title>Documentation <filename>Makefile</filename>s</title>
<para>These <filename>Makefile</filename>s set &man.make.1;
variables that describe how to build the documentation
contained in that directory.</para>
<para>Here is an example:</para>
<programlisting>MAINTAINER=nik@FreeBSD.org
DOC?= book
FORMATS?= html-split html
INSTALL_COMPRESSED?= gz
INSTALL_ONLY_COMPRESSED?=
# SGML content
SRCS= book.xml
DOC_PREFIX?= ${.CURDIR}/../../..
.include "$(DOC_PREFIX)/share/mk/docproj.docbook.mk"</programlisting>
<para>The <varname>MAINTAINER</varname> variable allows
committers to claim ownership of a document in the &os;
Documentation Project, and take responsibility for maintaining
it.</para>
<para><varname>DOC</varname> is the name (sans the
<filename>.xml</filename> extension) of the main document
created by this directory. <varname>SRCS</varname> lists all
the individual files that make up the document. This should
also include important files in which a change should result
in a rebuild.</para>
<para><varname>FORMATS</varname> indicates the default formats
that should be built for this document.
<varname>INSTALL_COMPRESSED</varname> is the default list of
compression techniques that should be used in the document
build. <varname>INSTALL_ONLY_COMPRESS</varname>, empty by
default, should be non-empty if only compressed documents are
desired in the build.</para>
<para>The <varname>DOC_PREFIX</varname> and include statements
should be familiar already.</para>
</sect2>
</sect1>
<sect1 xml:id="make-includes">
<title>&os; Documentation Project
<application>Make</application> Includes</title>
<para>&man.make.1; includes are best explained by inspection of
the code. Here are the system include files:</para>
<itemizedlist>
<listitem>
<para><filename>doc.project.mk</filename> is the main project
include file, which includes all the following include
files, as necessary.</para>
</listitem>
<listitem>
<para><filename>doc.subdir.mk</filename> handles traversing of
the document tree during the build and install
processes.</para>
</listitem>
<listitem>
<para><filename>doc.install.mk</filename> provides variables
that affect ownership and installation of documents.</para>
</listitem>
<listitem>
<para><filename>doc.docbook.mk</filename> is included if
<varname>DOCFORMAT</varname> is <literal>docbook</literal>
and <varname>DOC</varname> is set.</para>
</listitem>
</itemizedlist>
<sect2>
<title><filename>doc.project.mk</filename></title>
<para>By inspection:</para>
<programlisting>DOCFORMAT?= docbook
MAINTAINER?= doc@FreeBSD.org
PREFIX?= /usr/local
PRI_LANG?= en_US.ISO8859-1
.if defined(DOC)
.if ${DOCFORMAT} == "docbook"
.include "doc.docbook.mk"
.endif
.endif
.include "doc.subdir.mk"
.include "doc.install.mk"</programlisting>
<sect3>
<title>Variables</title>
<para><varname>DOCFORMAT</varname> and
<varname>MAINTAINER</varname> are assigned default values,
if these are not set by the document make file.</para>
<para><varname>PREFIX</varname> is the prefix under which the
<link linkend="tools">documentation building tools</link>
are installed. For normal package and port installation,
this is <filename>/usr/local</filename>.</para>
<para><varname>PRI_LANG</varname> should be set to whatever
language and encoding is natural amongst users these
documents are being built for. US English is the
default.</para>
<note>
<para><varname>PRI_LANG</varname> does not affect which
documents can, or even will, be built. Its main use is
creating links to commonly referenced documents into the
&os; documentation install root.</para>
</note>
</sect3>
<sect3>
<title>Conditionals</title>
<para>The <literal>.if defined(DOC)</literal> line is an
example of a &man.make.1; conditional which, like in other
programs, defines behavior if some condition is true or if
it is false. <literal>defined</literal> is a function which
returns whether the variable given is defined or not.</para>
<para><literal>.if ${DOCFORMAT} == "docbook"</literal>, next,
tests whether the <varname>DOCFORMAT</varname> variable is
<literal>"docbook"</literal>, and in this case, includes
<filename>doc.docbook.mk</filename>.</para>
<para>The two <literal>.endif</literal>s close the two above
conditionals, marking the end of their application.</para>
</sect3>
</sect2>
<sect2>
<title><filename>doc.subdir.mk</filename></title>
<para>This file is too long to explain in detail. These notes
describe the most important features.</para>
<sect3>
<title>Variables</title>
<itemizedlist>
<listitem>
<para><varname>SUBDIR</varname> is a list of
subdirectories that the build process should go further
down into.</para>
</listitem>
<listitem>
<para><varname>ROOT_SYMLINKS</varname> is the name of
directories that should be linked to the document
install root from their actual locations, if the current
language is the primary language (specified by
<varname>PRI_LANG</varname>).</para>
</listitem>
<listitem>
<para><varname>COMPAT_SYMLINK</varname> is described in
the
<link linkend="sub-make">Subdirectory Makefile</link>
section.</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Targets and Macros</title>
<para>Dependencies are described by
<literal><replaceable>target</replaceable>:
<replaceable>dependency1 dependency2
...</replaceable></literal> tuples, where to build
<literal>target</literal>, the given
dependencies must be built first.</para>
<para>After that descriptive tuple, instructions on how to
build the target may be given, if the conversion process
between the target and its dependencies are not previously
defined, or if this particular conversion is not the same as
the default conversion method.</para>
<para>A special dependency <literal>.USE</literal> defines
the equivalent of a macro.</para>
<programlisting>_SUBDIRUSE: .USE
.for entry in ${SUBDIR}
@${ECHO} "===> ${DIRPRFX}${entry}"
@(cd ${.CURDIR}/${entry} && \
${MAKE} ${.TARGET:S/realpackage/package/:S/realinstall/install/} DIRPRFX=${DIRPRFX}${entry}/ )
.endfor</programlisting>
<para>In the above, <buildtarget>_SUBDIRUSE</buildtarget> is now
a macro which will execute the given commands when it is
listed as a dependency.</para>
<para>What sets this macro apart from other targets?
Basically, it is executed <emphasis>after</emphasis> the
instructions given in the build procedure it is listed as a
dependency to, and it does not adjust
<varname>.TARGET</varname>, which is the variable which
contains the name of the target currently being
built.</para>
<programlisting>clean: _SUBDIRUSE
rm -f ${CLEANFILES}</programlisting>
<para>In the above, <buildtarget>clean</buildtarget> will use
the <buildtarget>_SUBDIRUSE</buildtarget> macro after it has
executed the instruction
<command>rm -f ${CLEANFILES}</command>. In effect, this
causes <buildtarget>clean</buildtarget> to go further and
further down the directory tree, deleting built files as it
goes <emphasis>down</emphasis>, not on the way back
up.</para>
<sect4>
<title>Provided Targets</title>
<itemizedlist>
<listitem>
<para><buildtarget>install</buildtarget> and
<buildtarget>package</buildtarget> both go down the
directory tree calling the real versions of themselves
in the subdirectories
(<buildtarget>realinstall</buildtarget> and
<buildtarget>realpackage</buildtarget>
respectively).</para>
</listitem>
<listitem>
<para><buildtarget>clean</buildtarget> removes files
created by the build process (and goes down the
directory tree too).
<buildtarget>cleandir</buildtarget> does the same, and
also removes the object directory, if any.</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title>More on Conditionals</title>
<itemizedlist>
<listitem>
<para><literal>exists</literal> is another condition
function which returns true if the given file
exists.</para>
</listitem>
<listitem>
<para><literal>empty</literal> returns true if the given
variable is empty.</para>
</listitem>
<listitem>
<para><literal>target</literal> returns true if the given
target does not already exist.</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Looping Constructs in <command>make
(.for)</command></title>
<para><literal>.for</literal> provides a way to repeat a set
of instructions for each space-separated element in a
variable. It does this by assigning a variable to contain
the current element in the list being examined.</para>
<programlisting>_SUBDIRUSE: .USE
.for entry in ${SUBDIR}
@${ECHO} "===> ${DIRPRFX}${entry}"
@(cd ${.CURDIR}/${entry} && \
${MAKE} ${.TARGET:S/realpackage/package/:S/realinstall/install/} DIRPRFX=${DIRPRFX}${entry}/ )
.endfor</programlisting>
<para>In the above, if <varname>SUBDIR</varname> is empty, no
action is taken; if it has one or more elements, the
instructions between <literal>.for</literal> and
<literal>.endfor</literal> would repeat for every element,
with <varname>entry</varname> being replaced with the value
of the current element.</para>
</sect3>
</sect2>
</sect1>
</chapter>
|