Twig and Kohana3.2

controller.php

<?php
// application/classes/controller.php
class TwigView {
    protected static $_instance = null;
    protected $_env;
    
    public static function getInstance(){
        if(self::$_instance === null){
            self::$_instance = new TwigView();           
        }
        return self::$_instance;   
        
    }
    
    public static function proxy(){
        $args = func_get_args();
        $class = ucfirst(array_shift($args));
        $method = array_shift($args);
        return call_user_func_array("{$class}::{$method}",$args);
    }
    
    
    
    protected function __construct(){
       if (!class_exists('Twig_Autoloader')) {
                //application/vendor/Twig
                require APPPATH.'vendor'.DIRECTORY_SEPARATOR.'Twig'.DIRECTORY_SEPARATOR.'Autoloader.php';
        }
       Twig_Autoloader::register();
       $loader = new Twig_Loader_Filesystem(APPPATH.'views');
       $this->_env = new Twig_Environment(
                $loader,
                array('auto_reload'=>true, 'cache'=>APPPATH.'cache'.DIRECTORY_SEPARATOR.'twig')
            );
       $this->_env->addFunction('kohana_*_*', new Twig_Function_Function('TwigView::proxy', array('is_safe' => array('html'))));
    }
    
    public function get_env(){
        return $this->_env; 
    }
    
    public function render($filename, $context = array()){
        $response = $this->get_env()->loadTemplate($filename)->render($context);
        return $response;
    }
}

twigview.php

<?php 
// application/classes/twigview.php
class Controller extends Kohana_Controller {
    protected function error_404(){
    
    
    }
    
    protected function render_to_response($filename, $context=array()){
         $response = TwigView::getInstance()->render($filename, $context);
         $this->response->body($response);
    }

}