public function notify(\Exception $exception)
 {
     if (!$exception instanceof ServiceNotFoundException) {
         return;
     }
     $serviceId = $exception->getId();
     $guessedFqcn = $this->guessFqcn($serviceId);
     $definition = new Definition();
     $definition->setClass($guessedFqcn);
     $containerBuilder = new ContainerBuilder();
     $containerBuilder->addDefinitions([$serviceId => $definition]);
     $dumper = new YamlDumper($containerBuilder);
     $result = $dumper->dump();
     $message = sprintf('Service `%s` missing. Define it in your services.yml:', $serviceId);
     $this->output->writeln('--- ' . $message . PHP_EOL);
     $this->output->write($result, true);
     $errorMessages = ['Service ' . $serviceId . ' was not found.'];
     $formatter = new FormatterHelper();
     $formattedBlock = $formatter->formatBlock($errorMessages, 'error', true);
     $this->output->writeln('');
     $this->output->writeln($formattedBlock);
     $this->output->writeln('');
     $question = sprintf('<question>Do you want to create a specification for %s? (Y/n)</question>', $guessedFqcn);
     $dialog = new DialogHelper();
     if ($dialog->askConfirmation($this->output, $question, true)) {
         $this->specRunner->runDescCommand($guessedFqcn);
     }
 }
 public function runDescCommand($className)
 {
     $this->descRunner->runDescCommand($className);
 }