Add AppBundle and the YouTube and Vimeo Twig functions

src/AppBundle/AppBundle.php

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+<?php
+
+namespace AppBundle;
+
+use Symfony\Component\HttpKernel\Bundle\Bundle;
+
+class AppBundle extends Bundle
+{
+}

src/AppBundle/DependencyInjection/AppExtension.php

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+<?php
+
+namespace AppBundle\DependencyInjection;
+
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\HttpKernel\DependencyInjection\Extension;
+use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
+use Symfony\Component\Config\FileLocator;
+
+class AppExtension extends Extension
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function load(array $configs, ContainerBuilder $container)
+    {
+        $loader = new YamlFileLoader($container, new FileLocator(__DIR__ . '/../config'));
+        $loader->load('services.yml');
+    }
+}

src/AppBundle/Twig/VimeoExtension.php

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+<?php
+
+namespace AppBundle\Twig;
+
+use Twig_Extension;
+use Twig_SimpleFunction;
+
+class VimeoExtension extends Twig_Extension
+{
+    public function getFunctions()
+    {
+        return [
+          new Twig_SimpleFunction('vimeo', [$this, 'embedCode'])
+        ];
+    }
+
+    /**
+     * Generates the embed code for a video.
+     *
+     * @param $videoId
+     *   The ID of the video.
+     *
+     * @return string
+     */
+    public function embedCode($videoId)
+    {
+        return sprintf(
+            '<iframe src="https://player.vimeo.com/video/%s?title=0&portrait=0" width="500" height="281" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>',
+            $videoId
+        );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getName()
+    {
+        return 'vimeo';
+    }
+
+}

src/AppBundle/Twig/YouTubeExtension.php

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+<?php
+
+namespace AppBundle\Twig;
+
+use Twig_Extension;
+use Twig_SimpleFunction;
+
+class YouTubeExtension extends Twig_Extension
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function getFunctions()
+    {
+        return [
+            new Twig_SimpleFunction('youtube', [$this, 'embedCode'])
+        ];
+    }
+
+    /**
+     * Generates the embed code for a video.
+     *
+     * @param $videoId
+     *   The ID of the video.
+     *
+     * @return string
+     */
+    public function embedCode($videoId)
+    {
+        return sprintf(
+            '<iframe width="560" height="315" src="https://www.youtube.com/embed/%s" frameborder="0" allowfullscreen></iframe>',
+            $videoId
+        );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getName()
+    {
+        return 'youtube';
+    }
+
+}

src/AppBundle/config/services.yml

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+services:
+    app.twig.vimeo:
+        class: AppBundle\Twig\VimeoExtension
+        tags:
+            - { name: twig.extension }
+    app.twig.youtube:
+        class: AppBundle\Twig\YouTubeExtension
+        tags:
+            - { name: twig.extension }