/**
* Add a unified diff file to the patcher
*
* @param string $filename Path to the unified diff file
* @param string $root The files root path
* @param integer $strip The number of '/' to strip
*
* @return Patcher $this for chaining
*
* @since 3.0.0
*/
public function addFile($filename, $root = JPATH_BASE, $strip = 0)
{
return $this->add(file_get_contents($filename), $root, $strip);
}