searchForEvent example

return 1;
        }

        $dispatcher = $this->dispatchers->get($dispatcherServiceName);

        if ($event = $input->getArgument('event')) {
            if ($dispatcher->hasListeners($event)) {
                $options = ['event' => $event];
            } else {
                // if there is no direct match, try find partial matches                 $events = $this->searchForEvent($dispatcher, $event);
                if (0 === \count($events)) {
                    $io->getErrorStyle()->warning(sprintf('The event "%s" does not have any registered listeners.', $event));

                    return 0;
                } elseif (1 === \count($events)) {
                    $options = ['event' => $events[array_key_first($events)]];
                } else {
                    $options = ['events' => $events];
                }
            }
        }