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<h1 class="lined-header"><span>External plugins</span></h1>
<div class="paragraph"><p>It is often convenient to be able to keep the build files
used by all your projects in one place. Those files could
be Makefiles, configuration files, templates and more.</p></div>
<div class="paragraph"><p>Erlang.mk allows you to automatically load plugins from
dependencies. Plugins can do anything, including defining
new variables, defining file templates, hooking themselves
inside the normal Erlang.mk processing or even adding new
rules.</p></div>
<div class="paragraph"><p>You can load plugins using one of two methods. You can
either load all plugins from a dependency, or just one.
We will also cover conventions about writing external
plugins.</p></div>
<div class="sect1">
<h2 id="_loading_all_plugins_from_a_dependency">Loading all plugins from a dependency</h2>
<div class="sectionbody">
<div class="paragraph"><p>To load plugins from a dependency, all you need to do is add
the dependency name to <code>DEP_PLUGINS</code> in addition to the list
of dependencies.</p></div>
<div class="paragraph"><p>For example, if you have <code>cowboy</code> in <code>DEPS</code>, add <code>cowboy</code> in
<code>DEP_PLUGINS</code> also:</p></div>
<div class="listingblock">
<div class="content"></div></div>
<div class="paragraph"><p>This will load the file <em>plugins.mk</em> in the root folder of
the Cowboy repository.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_loading_one_plugin_from_a_dependency">Loading one plugin from a dependency</h2>
<div class="sectionbody">
<div class="paragraph"><p>Now that we know how to load all plugins, let’s take a look
at how to load one specific plugin from a dependency.</p></div>
<div class="paragraph"><p>To do this, instead of writing only the name of the dependency,
we will write its name and the path to the plugin file. This
means that writing <code>DEP_PLUGINS = cowboy</code> is equivalent to
writing <code>DEP_PLUGINS = cowboy/plugins.mk</code>.</p></div>
<div class="paragraph"><p>Knowing this, if we were to load the plugin <em>mk/dist.mk</em>
from Cowboy and no other, we would write the following in
our Makefile:</p></div>
<div class="listingblock">
<div class="content"></div></div>
</div>
</div>
<div class="sect1">
<h2 id="_writing_external_plugins">Writing external plugins</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <em>plugins.mk</em> file is a convention. It is meant to load
all the plugins from the dependency. The code for the plugin
can be written directly in <em>plugins.mk</em> or be separate.</p></div>
<div class="paragraph"><p>If you are providing more than one plugin with your repository,
the recommended way is to create one file per plugin in the
<em>mk/</em> folder in your repository, and then include those
individual plugins in <em>plugins.mk</em>.</p></div>
<div class="paragraph"><p>For example, if you have two plugins <em>mk/dist.mk</em> and
<em>mk/templates.mk</em>, you could write the following <em>plugins.mk</em>
file:</p></div>
<div class="listingblock">
<div class="content"></div></div>
<div class="paragraph"><p>The <code>THIS</code> variable is required to relatively include files.</p></div>
<div class="paragraph"><p>This allows users to not only be able to select individual
plugins, but also select all plugins from the dependency
in one go if they wish to do so.</p></div>
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Erlang.mk
1
User Guide
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