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<body class="article">
<div id="header">
<h1>builtin API</h1>
</div>
<div id="content">
<div class="sect1">
<h2 id="_adding_a_new_built_in">Adding a new built-in</h2>
<div class="sectionbody">
<div class="paragraph"><p>There are 4 things to do to add a built-in command implementation to
Git:</p></div>
<div class="olist arabic"><ol class="arabic">
<li>
<p>
Define the implementation of the built-in command <code>foo</code> with
  signature:
</p>
<div class="literalblock">
<div class="content">
<pre><code>int cmd_foo(int argc, const char **argv, const char *prefix);</code></pre>
</div></div>
</li>
<li>
<p>
Add the external declaration for the function to <code>builtin.h</code>.
</p>
</li>
<li>
<p>
Add the command to <code>commands[]</code> table in <code>handle_internal_command()</code>,
  defined in <code>git.c</code>.  The entry should look like:
</p>
<div class="literalblock">
<div class="content">
<pre><code>{ "foo", cmd_foo, &lt;options&gt; },</code></pre>
</div></div>
<div class="paragraph"><p>where options is the bitwise-or of:</p></div>
<div class="dlist"><dl>
<dt class="hdlist1">
<code>RUN_SETUP</code>
</dt>
<dd>
<p>
        Make sure there is a Git directory to work on, and if there is a
        work tree, chdir to the top of it if the command was invoked
        in a subdirectory.  If there is no work tree, no chdir() is
        done.
</p>
</dd>
<dt class="hdlist1">
<code>USE_PAGER</code>
</dt>
<dd>
<p>
        If the standard output is connected to a tty, spawn a pager and
        feed our output to it.
</p>
</dd>
<dt class="hdlist1">
<code>NEED_WORK_TREE</code>
</dt>
<dd>
<p>
        Make sure there is a work tree, i.e. the command cannot act
        on bare repositories.
        This only makes sense when <code>RUN_SETUP</code> is also set.
</p>
</dd>
</dl></div>
</li>
<li>
<p>
Add <code>builtin-foo.o</code> to <code>BUILTIN_OBJS</code> in <code>Makefile</code>.
</p>
</li>
</ol></div>
<div class="paragraph"><p>Additionally, if <code>foo</code> is a new command, there are 3 more things to do:</p></div>
<div class="olist arabic"><ol class="arabic">
<li>
<p>
Add tests to <code>t/</code> directory.
</p>
</li>
<li>
<p>
Write documentation in <code>Documentation/git-foo.txt</code>.
</p>
</li>
<li>
<p>
Add an entry for <code>git-foo</code> to <code>command-list.txt</code>.
</p>
</li>
<li>
<p>
Add an entry for <code>/git-foo</code> to <code>.gitignore</code>.
</p>
</li>
</ol></div>
</div>
</div>
<div class="sect1">
<h2 id="_how_a_built_in_is_called">How a built-in is called</h2>
<div class="sectionbody">
<div class="paragraph"><p>The implementation <code>cmd_foo()</code> takes three parameters, <code>argc</code>, <code>argv,
and `prefix</code>.  The first two are similar to what <code>main()</code> of a
standalone command would be called with.</p></div>
<div class="paragraph"><p>When <code>RUN_SETUP</code> is specified in the <code>commands[]</code> table, and when you
were started from a subdirectory of the work tree, <code>cmd_foo()</code> is called
after chdir(2) to the top of the work tree, and <code>prefix</code> gets the path
to the subdirectory the command started from.  This allows you to
convert a user-supplied pathname (typically relative to that directory)
to a pathname relative to the top of the work tree.</p></div>
<div class="paragraph"><p>The return value from <code>cmd_foo()</code> becomes the exit status of the
command.</p></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated 2013-06-10 20:01:55 UTC
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