Added Help button functionality.

Signed-off-by: Gergely POLONKAI <polesz@w00d5t0ck.info>

src/KekRozsak/FrontBundle/Twig/HelpUrlExtension.php

@@ -0,0 +1,69 @@
+<?php
+
+namespace KekRozsak\FrontBundle\Twig;
+
+use JMS\DiExtraBundle\Annotation as DI;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\Routing\Exception\RouteNotFoundException;
+
+/**
+ * Description of HelpUrlExtension
+ *
+ * @author Gergely Polonkai
+ * 
+ * @DI\Service
+ * @DI\Tag("twig.extension")
+ */
+class HelpUrlExtension extends \Twig_Extension
+{
+    /**
+     * @var Symfony\Component\DependencyInjection\ContainerInterface $container
+     */
+    private $container;
+
+    /**
+     * @DI\InjectParams({
+     *     "container" = @DI\Inject("service_container")
+     * })
+     */
+    public function __construct(ContainerInterface $container) {
+        $this->container = $container;
+    }
+
+    public function getGlobals() {
+        parent::getGlobals();
+        
+        $request = $this->container->get('request');
+        $router = $this->container->get('router');
+
+        $currentRoute = $request->get('_route');
+        $m = array();
+        $helpRoutes = array($currentRoute . 'Help');
+        $helpUrl = null;
+
+        if (preg_match('/^([^_]+)_([a-z]+)/', $currentRoute, $m)) {
+            $helpRoutes[] = $m[1] . '_' . $m[2] . 'Help';
+        }
+
+        foreach ($helpRoutes as $helpRoute) {
+            try {
+                $helpUrl = $router->generate($helpRoute);
+            } catch (RouteNotFoundException $e) {
+                $helpUrl = null;
+            }
+            if ($helpUrl !== null) {
+                break;
+            }
+        }
+
+        return array(
+            'helpUrl' => $helpUrl,
+        );
+    }
+    
+    public function getName()
+    {
+        return 'HelpUrl';
+    }
+}