protected function getConfigFiles($files, array $defaults = ['steak.yml', 'steak.php'])
    {
        $option = (new ArgvInput())->getParameterOption(['--config', '-c']);

        if ( ! $option) {
            foreach ($defaults as $default) {
                if ($files->exists($default)) {
                    $option = ($option ? ',' : '') . $default;
                }
            }
        }

        return $option ? explode(',', $option) : [];
    }