addArgument('mapping', InputArgument::REQUIRED, 'The mapping to debug.'); } protected function execute(InputInterface $input, OutputInterface $output): int { $mapping = $input->getArgument('mapping'); if (!isset($this->mappings[$mapping])) { throw new MappingNotFoundException(\sprintf('Mapping "%s" does not exist.', $mapping)); } $output->writeln(\sprintf('Debug information for mapping %s', $mapping)); foreach ($this->mappings[$mapping] as $key => $value) { $output->writeln(\sprintf('%s: %s', $key, \var_export($value, true))); } return self::SUCCESS; } public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void { if ($input->mustSuggestArgumentValuesFor('mapping')) { $suggestions->suggestValues(\array_keys($this->mappings)); } } }