drupal_composer_builder/src/BuildSettingsCommand.php

<?php

namespace Fgm\Drupal\Composer;

use Composer\Command\BaseCommand;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

class BuildSettingsCommand extends BaseBuilderCommand
{

    /**
     * @var string
     */
    protected $eventName;

    /**
     * {@inheritDoc}
     */
    public function configure()
    {
        parent::configure();
        $this->eventName = $this->getName();
        $this
            ->setName('build:settings')
            ->setDescription('Builds the *.settings.local.php files.')
            ->setDefinition([])
            ->setHelp(
                <<<EOT
The build:settings command combines shared and per-environment parameters and passes
them to the settings.local.php.twig template to build the settings/(build|run).settings.local.php files.

EOT
            );
    }

    /**
     * {@inheritDoc}
     */
    public function execute(InputInterface $input, OutputInterface $output)
    {
        $messageFormat = empty($this->eventName)
        ? "BuildSettingsCommand Executed on its own"
        : "BuildSettingsCommand Executed on \"%s\" event";
        $output->write(sprintf($messageFormat, $this->eventName), true);
    }
}