Handle "mailer" in swiftmailer:email:send

[ZCJ]

By default, the mailer will use the 'default' value for the mailer option.
->addOption('mailer', null, InputOption::VALUE_REQUIRED, 'The mailer name', 'default')
When executing swiftmailer: email: send , i was not prompt to enter/confirm/validate my 'mailer', and hence the command was throwing an error :

PHP Fatal error: Call to undefined method Symfony\Bundle\SwiftmailerBundle\Command\NewEmailCommand::getOption() in /Users/ZCJ/Sites/Spade/vendor/symfony/swiftmailer-bundle/Command/NewEmailCommand.php on line 61

That was because my mail service was configured as "gmail" and an exception was being raised in:
$mailerServiceName = sprintf('swiftmailer.mailer.%s', $input->getOption('mailer'));
if (!$this->getContainer()->has($mailerServiceName)) {
throw new \InvalidArgumentException(sprintf('The mailer "%s" does not exist', $this->getOption('mailer')));
}

I think it would be great if we can handle the mailer in the interact dialog.

For that, I am proposing something minor like :

if('default' === $input->getOption('mailer')){
$input->setOption('mailer',$dialog->ask($output, sprintf('Mailer (Enter for 'default'): '),'default'));
}