Add twig extension to update seo page

CHANGELOG.md

@@ -1,6 +1,7 @@
 Changelog
 =========
 
+* **2015-09-30**: Add `cmf_seo_update_metadata` twig function for updating seo metadata from templates using
 * **2015-09-08**: Add meta tag for language information
 * **2015-08-20**: Added templates configuration and `exclusion_rules` (based on the request matcher) to
   the error handling configuration

Resources/config/services.xml

@@ -11,6 +11,7 @@
         <parameter key="cmf_seo.cache.file.class">Symfony\Cmf\Bundle\SeoBundle\Cache\FileCache</parameter>
         <parameter key="cmf_seo.presentation.class">Symfony\Cmf\Bundle\SeoBundle\SeoPresentation</parameter>
         <parameter key="cmf_seo.error.suggestion_provider.controller.class">Symfony\Cmf\Bundle\SeoBundle\Controller\SuggestionProviderController</parameter>
+        <parameter key="cmf_seo.twig.extension.class">Symfony\Cmf\Bundle\SeoBundle\Twig\Extension\CmfSeoExtension</parameter>
     </parameters>
 
     <services>
@@ -58,6 +59,11 @@
         />
 
         <service id="cmf_seo.error.exclusion_matcher" class="Symfony\Cmf\Bundle\SeoBundle\Matcher\ExclusionMatcher" />
+
+        <service id="cmf_seo.twig.extension" class="%cmf_seo.twig.extension.class%" public="false">
+            <tag name="twig.extension" />
+            <argument type="service" id="cmf_seo.presentation" />
+        </service>
     </services>
 
 </container>

Twig/Extension/CmfSeoExtension.php

@@ -0,0 +1,57 @@
+<?php
+
+/*
+ * This file is part of the Symfony CMF package.
+ *
+ * (c) 2011-2015 Symfony CMF
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @author Ben Glassman <[email protected]>
+ */
+
+namespace Symfony\Cmf\Bundle\SeoBundle\Twig\Extension;
+
+use Symfony\Cmf\Bundle\SeoBundle\SeoPresentationInterface;
+
+class CmfSeoExtension extends \Twig_Extension
+{
+    /**
+     * @var SeoPresentationInterface
+     */
+    protected $seoPresentation;
+
+    /**
+     * @param SeoPresentationInterface $seoPresentation
+     */
+    public function __construct(SeoPresentationInterface $seoPresentation)
+    {
+        $this->seoPresentation = $seoPresentation;
+    }
+
+    /**
+     * @{inheritdoc}
+     */
+    public function getFunctions()
+    {
+        return array(
+            new \Twig_SimpleFunction('cmf_seo_update_metadata',
+                array($this, 'updateMetadata')
+            ),
+        );
+    }
+
+    /**
+     * @see SeoPresentationInterface
+     */
+    public function updateMetadata($content)
+    {
+        $this->seoPresentation->updateSeoPage($content);
+    }
+
+    public function getName()
+    {
+        return 'cmf_seo';
+    }
+}