function add_logger()
{
// If we're running on Drupal 8 or later, we provide a logger which will send
// output to drush_log(). This should catch every message logged through every
// channel.
$container = \Drupal::getContainer();
$parser = $container->get('logger.log_message_parser');
$drushLogger = \Drush::logger();
$logger = new \Drush\Log\DrushLog($parser, $drushLogger);
$container->get('logger.factory')->addLogger($logger);
}
