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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="sec-wrapping-documentation"></a>Documentation</h2></div></div></div>
<p>In general, gtkmm-style projects use Doxygen, which reads specially formatted C++ comments and generates HTML documentation. You may write these doxygen comments directly in the header files.</p>
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<div class="titlepage"><div><div><h3 class="title">
<a name="wrapping-reusing-c-documentation"></a>Reusing C documentation</h3></div></div></div>
<p>You might wish to reuse documentation that exists for the C library that
you are wrapping. GTK-style C libraries typically use gtk-doc or gi-docgen and therefore
have source code comments formatted for gtk-doc or gi-docgen and some extra documentation
in .sgml and .xml files. The docextract_to_xml.py script, from glibmm's
<code class="filename">tools/defs_gen</code> directory, can read these files and
generate an .xml file that <span class="command"><strong>gmmproc</strong></span> can use to generate
doxygen comments. <span class="command"><strong>gmmproc</strong></span> will even try to transform the
documentation to make it more appropriate for a C++ API.</p>
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For instance,</p>
<pre class="programlisting"><code class="code">./docextract_to_xml.py -s ~/checkout/gnome/gtk/gtk/ > gtk_docs.xml
</code></pre>
<p>Because this automatic transformation is not always appropriate, you might
want to provide hand-written text for a particular method. You can do this
by copying the XML node for the function from your
<code class="filename">something_docs.xml</code> file to the
<code class="filename">something_docs_override.xml</code> file and changing the
contents. Alternatively you can write your own documentation in the
<code class="filename">.hg</code> file.</p>
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<a name="wrapping-documentation-build-structure"></a>Documentation build structure</h3></div></div></div>
<p>If you copied the skeleton source tree in <span class="application">mm-common</span> and substituted the
placeholder text, then you will already have suitable <code class="filename">meson.build</code>
and <code class="filename">Doxyfile.in</code> files in the <code class="filename">doc/reference/</code>
directory. You probably need to modify the <code class="varname">tag_file_modules</code>
variable in <code class="filename">meson.build</code>, though.
With the <span class="application">mm-common</span> build setup, the list
of Doxygen input files is not defined in the Doxygen configuration file, but passed
along from <span class="command"><strong>meson/ninja</strong></span> to the standard input of <span class="command"><strong>doxygen</strong></span>.
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