feature #102 Dropdown to change locale (JulienItard)

This PR was squashed before being merged into the master branch (closes #102).

Discussion
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Dropdown to change locale

see #83

Someone should add comments in routing.yml because my english it not good enough :)

![capture du 2015-07-15 19 52 19](https://cloud.githubusercontent.com/assets/1370893/8705607/0b15ade0-2b2b-11e5-933a-5cafaad4c8ee.png)

Commits
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307236b Dropdown to change locale

app/Resources/assets/scss/main.scss

@@ -59,6 +59,10 @@ header {
     ul.nav li {
         margin-bottom: 0;
     }
+
+    .locales a {
+        padding-right: 10px;
+    }
 }
 
 // Body contents

app/Resources/views/base.html.twig

@@ -49,7 +49,9 @@
                         </div>
                         <div class="navbar-collapse collapse">
                             <ul class="nav navbar-nav navbar-right">
+
                                 {% block header_navigation_links %}
+
                                     <li>
                                         <a href="{{ path('blog_index') }}">
                                             <i class="fa fa-home"></i> {{ 'menu.homepage'|trans }}
@@ -77,6 +79,16 @@
                                         </a>
                                     </li>
                                 {% endif %}
+
+                                <li class="dropdown">
+                                    <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false"><i class="fa fa-globe"></i> <span class="caret"></span></a>
+                                    <ul class="dropdown-menu locales" role="menu">
+                                        {% for locale in locales() %}
+                                            <li {% if app.request.locale == locale.code %}class="active"{% endif %}><a href="{{ path('blog_index', {_locale:locale.code}) }}">{{ locale.name|capitalize }}</a></li>
+                                        {% endfor %}
+                                    </ul>
+                                </li>
+
                             </ul>
                         </div>
                     </div>

app/config/config.yml

@@ -9,6 +9,9 @@ imports:
     - { resource: security.yml }
     - { resource: services.yml }
 
+parameters:
+    app_locales: en|fr|de|es|cs|ru|uk|ro|pt_BR
+
 # Basic configuration for the Symfony framework features
 framework:
     # Uncomment the 'ide' option to turn all of the file paths in an exception

app/config/routing.yml

@@ -7,6 +7,11 @@
 app:
     resource: @AppBundle/Controller/
     type:     annotation
+    prefix:   /{_locale}
+    requirements: 
+        _locale: %app_locales%
+    defaults:
+        _locale: %locale%
 
 # These lines define a route using YAML configuration. The controller used by
 # the route (FrameworkBundle:Template:template) is a convenient shortcut when

app/config/services.yml

@@ -18,6 +18,12 @@ services:
         tags:
             - { name: twig.extension }
 
+    app.twig.locale_extension:
+        class:     AppBundle\Twig\LocaleExtension
+        arguments: ["%app_locales%"]
+        tags:
+            - { name: twig.extension }
+
     app.twig.source_code_extension:
         class:     AppBundle\Twig\SourceCodeExtension
         arguments: ["@twig.loader", "%kernel.root_dir%"]

src/AppBundle/Controller/BlogController.php

@@ -11,16 +11,17 @@
 
 namespace AppBundle\Controller;
 
-use Symfony\Bundle\FrameworkBundle\Controller\Controller;
+use AppBundle\Entity\Comment;
+use AppBundle\Entity\Post;
+use AppBundle\Form\CommentType;
 use Sensio\Bundle\FrameworkExtraBundle\Configuration\Method;
+use Sensio\Bundle\FrameworkExtraBundle\Configuration\ParamConverter;
 use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
 use Sensio\Bundle\FrameworkExtraBundle\Configuration\Security;
-use Sensio\Bundle\FrameworkExtraBundle\Configuration\ParamConverter;
+use Symfony\Bundle\FrameworkBundle\Controller\Controller;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use AppBundle\Entity\Post;
-use AppBundle\Entity\Comment;
-use AppBundle\Form\CommentType;
+use Symfony\Component\Intl\Intl;
 
 /**
  * Controller used to manage blog contents in the public part of the site.

src/AppBundle/Twig/LocaleExtension.php

@@ -0,0 +1,51 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace AppBundle\Twig;
+
+use Symfony\Component\Intl\Intl;
+
+/**
+ * @author Julien ITARD <julienitard@gmail.com>
+ */
+class LocaleExtension extends \Twig_Extension
+{
+    private $locales;
+
+    public function __construct( $locales)
+    {
+        $this->locales = $locales;
+    }
+
+    public function getFunctions()
+    {
+        return array(
+            new \Twig_SimpleFunction('locales', array($this, 'getLocales')),
+        );
+    }
+
+    public function getLocales()
+    {
+        $array = explode('|', $this->locales);
+
+        foreach ($array as $locale) {
+            $locales[] = array('code' => $locale, 'name' => Intl::getLocaleBundle()->getLocaleName($locale, $locale));
+        }
+
+        return $locales; 
+    }
+
+    // the name of the Twig extension must be unique in the application
+    public function getName()
+    {
+        return 'app.locale_extension';
+    }
+}