CommandGenerator.php

<?php
/**
 * @file
 * Contains \Drupal\AppConsole\Generator\CommandGenerator.
 */

namespace Drupal\AppConsole\Generator;

class CommandGenerator extends Generator
{
    /**
     * Generator Plugin Block
     * @param  string $module Module name
     * @param  string $command Command name
     * @param  string $class_name class name for plugin block
     * @param  array $container Access to container class
     */
    public function generate($module, $command, $class_name, $container)
    {
        $command_key_root = 'command.' . str_replace(':', '.', $command);

        $parameters = [
          'module_name' => $module,
          'command' => $command,
          'name' => [
            'class' => $class_name,
          ],
          'container' => $container,
          'command_key_root' => $command_key_root
        ];

        $messages[$command_key_root . '.description'] = 'Greet someone';
        $messages[$command_key_root . '.arguments.name'] = 'Who do you want to greet?';
        $messages[$command_key_root . '.options.yell'] = 'If set, the task will yell in uppercase letters';

        $translator = $this->getTranslator();
        $translator->writeTranslationsByModule($module, $messages);

        $this->renderFile(
          'module/src/Command/command.php.twig',
          $this->getCommandPath($module) . '/' . $class_name . '.php',
          $parameters
        );
    }
}