Add DI compiler pass to register commonmark extension

DependencyInjection/Compiler/CommonMarkExtensionPass.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Bcremer\Sculpin\Bundle\CommonMarkBundle\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\Reference;
+
+class CommonMarkExtensionPass implements CompilerPassInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function process(ContainerBuilder $container)
+    {
+        if (false === $container->hasDefinition('sculpin_commonmark.environment')) {
+            return;
+        }
+
+        $definition = $container->getDefinition('sculpin_commonmark.environment');
+
+        foreach ($container->findTaggedServiceIds('sculpin_commonmark.extension') as $id => $attributes) {
+            $definition->addMethodCall(
+                'addExtension',
+                [new Reference($id)]
+            );
+        }
+    }
+}

README.md

@@ -34,7 +34,12 @@ class SculpinKernel extends \Sculpin\Bundle\SculpinBundle\HttpKernel\AbstractKer
 }
 ```
 
-## Defined services
+## Extensibility
+This bundle provides access to the low level component of the `thephpleague/commonmark` package.
+For more information about `thephpleague/commonmark` customization please see [Advanced Usage & Customization](https://github.com/thephpleague/commonmark#advanced-usage--customization) and 
+[Community Extensions](https://github.com/thephpleague/commonmark#community-extensions).
+
+### Defined services
 This bundle defines the following services in the sculpin DI Container:
 
 * `sculpin_commonmark.environment`
@@ -43,6 +48,13 @@ This bundle defines the following services in the sculpin DI Container:
 * `sculpin_commonmark.converter`
 * `sculpin_commonmark.event.commonmark`
 
+### Defined DI Tags 
+This bundle handles the following [Dependency Injection Tags](http://symfony.com/doc/current/components/dependency_injection/tags.html):
+
+* `sculpin_commonmark.extension`: To add a implementation of [`League\CommonMark\Extension\ExtensionInterface`](https://github.com/thephpleague/commonmark/blob/master/src/Extension/ExtensionInterface.php) to the 
+[`League\CommonMark\Environment`](https://github.com/thephpleague/commonmark/blob/master/src/Environment.php).
+
+
 ## License
 
 The MIT License (MIT). Please see [License File](LICENSE) for more information.

SculpinCommonMarkBundle.php

@@ -1,9 +1,19 @@
 <?php
 namespace Bcremer\Sculpin\Bundle\CommonMarkBundle;
 
+use Bcremer\Sculpin\Bundle\CommonMarkBundle\DependencyInjection\Compiler\CommonMarkExtensionPass;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\HttpKernel\Bundle\Bundle;
 
 class SculpinCommonMarkBundle extends Bundle
 {
     const CONVERTER_NAME = 'commonmark';
+
+    /**
+     * {@inheritdoc}
+     */
+    public function build(ContainerBuilder $container)
+    {
+        $container->addCompilerPass(new CommonMarkExtensionPass());
+    }
 }