add the new property 'version' for define asset version

Entea/Twig/Extension/AssetExtension.php

@@ -7,31 +7,62 @@
 
 namespace Entea\Twig\Extension;
 
-class AssetExtension extends  \Twig_Extension 
+class AssetExtension extends \Twig_Extension 
 {
     private $app;
     private $options;
-
+
+    private $_assetDirectory;
+    private $_assetVersion;
+
+    /**
+     * Constructor 
+     * 
+     * @param \Silex\Application $app
+     * @param array $options
+     */
     function __construct(\Silex\Application $app, array $options = array())
     {
         $this->app = $app;
         $this->options = $options;
     }
-
+
+    public function initRuntime(\Twig_Environment $environment) 
+    {   
+        parent::initRuntime($environment);
+
+        $this->_assetDirectory = $this->app['request']->getBasePath();
+        if(isset($this->options['asset.directory']))
+            $this->_assetDirectory = $this->options['asset.directory'];
+
+        $this->_assetVersion = '1.0';
+        if(isset($this->options['asset.version']))
+            $this->_assetVersion = $this->options['asset.version'];
+    }
+
     public function getFunctions()
     {
         return array(
-            'asset'    => new \Twig_Function_Method($this, 'asset'),
+            'asset' => new \Twig_Function_Method($this, 'asset'),
         );
     }
-
-    public function asset($url) 
+
+    /**
+     * Logic for the "asset" function of Twig 
+     * 
+     * @param type $url
+     * @param type $version
+     * @return type
+     */
+    public function asset($url, $version=NULL) 
     {
-        $assetDir = isset($this->options['asset.directory']) ? 
-            $this->options['asset.directory'] : 
-            $this->app['request']->getBasePath();
-
-        return sprintf('%s/%s', $assetDir, ltrim($url, '/'));
+        if($version !== NULL)
+            $this->_assetVersion = $version;
+
+        return sprintf('%s/%s?v=%s', 
+                $this->_assetDirectory, 
+                ltrim($url, '/'),
+                $this->_assetVersion);
     }
 
     /**

README.md

@@ -31,9 +31,14 @@ And then, in your twig file:
 ```
 {{asset('/style/hello.css')}}
 ```
+or with a specific version which overrides the global version
+```
+{{asset('/style/hello.css', '1.2')}}
+```
 
 ### Properties
  - **asset.directory**: Your asset directory
+ - **asset.version**: Your asset global version (default: 1.0)
 
 ### Installation