Hackathon Extension Point for Setup App

di.xml

    <type name="wrapperList">
        <arguments>
            <argument name="wrappers" xsi:type="array">
                <item xsi:type="string">UpgradeCommand</item>
                <item xsi:type="array">
                    <item xsi:type="array">
                        <item xsi:type="object">Wrapper</item>
                    </item>
                </item>
            </argument>
        </arguments>
    </type>

Magento\Framework\Console\Cli

<?php
namespace Magento\Framework\Console;

use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Output\ConsoleOutput;
use Symfony\Component\Console\Input\ArgvInput;
use Symfony\Component\Console\Application as SymfonyApplication;
use Magento\Framework\App\Bootstrap;
use Magento\Framework\Filesystem\Driver\File;
use Magento\Framework\Shell\ComplexParameter;
use Magento\Setup\Console\CompilerPreparation;

/**
 * Magento 2 CLI Application. This is the hood for all command line tools supported by Magento
 *
 * {@inheritdoc}
 * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
 */
class Cli extends SymfonyApplication
{
  /**
   * Gets application commands
   *
   * @return array
   */
  protected function getApplicationCommands()
  {
      $commands = [];
      try {
          $bootstrapParam = new ComplexParameter(self::INPUT_KEY_BOOTSTRAP);
          $params = $bootstrapParam->mergeFromArgv($_SERVER, $_SERVER);
          $params[Bootstrap::PARAM_REQUIRE_MAINTENANCE] = null;
          $bootstrap = Bootstrap::create(BP, $params);
          $objectManager = $bootstrap->getObjectManager();
          /** @var \Magento\Setup\Model\ObjectManagerProvider $omProvider */
          $omProvider = $this->serviceManager->get('Magento\Setup\Model\ObjectManagerProvider');
          $omProvider->setObjectManager($objectManager);

          if (class_exists('Magento\Setup\Console\CommandList')) {
              $setupCommandList = new \Magento\Setup\Console\CommandList($this->serviceManager);
              $commands = array_merge($commands, $setupCommandList->getCommands());
          }

          if ($objectManager->get('Magento\Framework\App\DeploymentConfig')->isAvailable()) {
              /** @var \Magento\Framework\Console\CommandList $commandList */
              $commandList = $objectManager->create('Magento\Framework\Console\CommandList');
              $commands = array_merge($commands, $commandList->getCommands());
          }

          $commands = array_merge($commands, $this->getVendorCommands($objectManager));

          $commands = $objectManager->create('wrapperList')->decorate($commands);
      } catch (\Exception $e) {
          $this->initException = $e;
      }
      return $commands;
  }
}

WrapperList

<?php
class WrapperList
{
    public function decorate($commands)
    {
        foreach($commands as $key => $command) {
            $class = get_class($command);
            if (isset($this->decorators[$class])) {
                foreach ($this->decorators[$class] as $decorator) {
                    $commands[$key] = $this->decoratorFactory->care($decorator, ['subject' => $commands[$key]]);
                }
            }
        }
        return $commands;
    }
}