Integrate Magento and Silverstripe autoloaders

When you try to include the Magento Mage class in your SilverStripe project, Magento will try to load classes that have already been loaded by SilverStripe’s __autoload() method. (bleh, try saying that 3 times fast ;)

What I did was really hacky… Magento is really well namespaced, so I just gave it’s autoloader a list of classes that it was allowed to load. Anything else is handled by SilverStripe’s autoloader.

Change store/lib/Varien/Autoload.php [line 80-ish] from this:

/**
 * Load class source code
 *
 * @param string $class
 */
public function autoload($class)
{
    if ($this->_collectClasses) {
        $this->_arrLoadedClasses[self::$_scope][] = $class;
    }
    if ($this->_isIncludePathDefined) {
        $classFile = $class;
    } else {
        $classFile = str_replace(' ', DIRECTORY_SEPARATOR, ucwords(str_replace('_', ' ', $class)));
    }
    $classFile.= '.php';
    return include $classFile;
}

to this:

/**
 * Load class source code
 *
 * @param string $class
 */
public function autoload($class)
{        
        if ( $this->is_magento_class($class) ) {
                if ($this->_collectClasses) {
                        $this->_arrLoadedClasses[self::$_scope][] = $class;
                }
                if ($this->_isIncludePathDefined) {
                        $classFile = $class;
                } else {
                        $classFile = str_replace(' ', DIRECTORY_SEPARATOR, ucwords(str_replace('_', ' ', $class)));
                }
                $classFile.= '.php';
                return include $classFile;        
        }
}

/**
 * You need to manually maintain this list of classes - if you install a module for example
 */
private function is_magento_class($className) {
        $namespaces = array('Zend', 'Varien', 'Mage', 'other', '3rd party', 'modules');

        $is_mage_class = false;
        foreach($namespaces as $namespace) {
                if( strpos($className, $namespace) !== false) {
                        $is_mage_class = true;
                }
        }

        return $is_mage_class;
}

Obviously this is ridiculously hacky and I did it this way cause I was running out of time to get a specific project working.

Maybe someone clever out there could devise some way of dynamically getting Magento’s classes? Or maybe do it on the silverstripe end - silverstripe maintains a manifest of its classes. something like that…