Add Twig extension with md2html filter

Author: petk

app/Resources/views/default/cheatsheet.html.twig

@@ -7,5 +7,5 @@
 {% endblock %}
 
 {% block body %}
-    {{ html|raw }}
+    {{ html|md2html }}
 {% endblock %}

app/Resources/views/default/conduct.html.twig

@@ -16,5 +16,5 @@
 {% endblock %}
 
 {% block body %}
-    {{ content|raw }}
+    {{ content|md2html }}
 {% endblock %}

app/Resources/views/default/resources.html.twig

@@ -7,5 +7,5 @@
 {% endblock %}
 
 {% block body %}
-    {{ html|raw }}
+    {{ html|md2html }}
 {% endblock %}

app/config/services.yml

@@ -1,13 +1,18 @@
-# Learn more about services, parameters and containers at
-# http://symfony.com/doc/current/book/service_container.html
-parameters:
-#    parameter_name: value
-
 services:
+    markdown:
+        class: Mni\FrontYAML\Parser
+
     app.repository.post:
         class:        AppBundle\Repository\PostRepository
-        arguments:    ["%kernel.root_dir%"]
+        arguments:    ['%kernel.root_dir%']
 
     app.repository.psr:
         class:        AppBundle\Repository\PsrRepository
-        arguments:    ["%kernel.root_dir%"]
+        arguments:    ['%kernel.root_dir%']
+
+    app.twig.app_extension:
+        class:  AppBundle\Twig\AppExtension
+        public: false
+        arguments: ['@markdown']
+        tags:
+            - { name: twig.extension }

src/AppBundle/Controller/DefaultController.php

@@ -13,7 +13,6 @@
 use AppBundle\Entity\Contact;
 use Sensio\Bundle\FrameworkExtraBundle\Configuration\Cache;
 use Symfony\Component\HttpFoundation\Response;
-use Mni\FrontYAML\Parser;
 use AppBundle\Entity\Project;
 
 class DefaultController extends Controller
@@ -168,10 +167,8 @@ public function resourcesAction(Request $request)
     {
         $file = $this->get('kernel')->getRootDir().'/../vendor/symfony-si/symfony-resources/README.md';
         $content = (file_exists($file)) ? file_get_contents($file) : '<h1>Symfony resources</h1>';
-        $parser = new Parser();
-        $document = $parser->parse($content);
 
-        return $this->render('default/resources.html.twig', ['html' => $document->getContent()]);
+        return $this->render('default/resources.html.twig', ['html' => $content]);
     }
 
     /**
@@ -182,10 +179,8 @@ public function cheatsheetAction()
     {
         $file = $this->get('kernel')->getRootDir().'/../vendor/symfony-si/symfony-cheatsheet/README.md';
         $content = (file_exists($file)) ? file_get_contents($file) : '<h1>Symfony cheat sheet</h1>';
-        $parser = new Parser();
-        $document = $parser->parse($content);
 
-        return $this->render('default/cheatsheet.html.twig', ['html' => $document->getContent()]);
+        return $this->render('default/cheatsheet.html.twig', ['html' => $content]);
     }
 
     /**
@@ -315,9 +310,7 @@ public function conductAction()
     {
         $file = $this->get('kernel')->getRootDir().'/../vendor/symfony-si/conduct/README.md';
         $content = (file_exists($file)) ? file_get_contents($file) : '<h1>Symfony.si Code of Conduct</h1>';
-        $parser = new Parser();
-        $document = $parser->parse($content);
 
-        return $this->render('default/conduct.html.twig', ['content' => $document->getContent()]);
+        return $this->render('default/conduct.html.twig', ['content' => $content]);
     }
 }

src/AppBundle/Twig/AppExtension.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace AppBundle\Twig;
+
+use Mni\FrontYAML\Parser;
+
+/**
+ * Application Twig extension which adds 'md2html' Twig filter for converting Markdown
+ * content to HTML.
+ */
+class AppExtension extends \Twig_Extension
+{
+    /**
+     * @var Parser
+     */
+    private $parser;
+
+    /**
+     * AppExtension constructor.
+     *
+     * @param Parser $parser
+     */
+    public function __construct(Parser $parser)
+    {
+        $this->parser = $parser;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getFilters()
+    {
+        return array(
+            new \Twig_SimpleFilter('md2html', [$this, 'markdownToHtml'], ['is_safe' => ['html']]),
+        );
+    }
+
+    /**
+     * Parses the given Markdown content and converts it HTML.
+     *
+     * @param string $content
+     * @return string
+     */
+    public function markdownToHtml($content)
+    {
+        $document = $this->parser->parse($content);
+        return $document->getContent();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getName()
+    {
+        return 'app.extension';
+    }
+}