Custom command registering strategies inside Symfony2 application.

Application.php

<?php
use Symfony\Component\Console\Application as BaseApplication;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\HttpKernel\KernelInterface;
use Symfony\Component\HttpKernel\Kernel;
use Symfony\Component\HttpKernel\Bundle\Bundle;
use Symfony\Bundle\FrameworkBundle\Console\Shell;

class Application extends BaseApplication
    {
    private $kernel;

    public function __construct(KernelInterface $kernel)
        {
        $this->kernel = $kernel;
        parent::__construct('Symfony', Kernel::VERSION.' - '.$kernel->getName().'/'.$kernel->getEnvironment().($kernel->isDebug() ? '/debug' : ''));
        $this->getDefinition()->addOption(new InputOption('--shell', '-s', InputOption::VALUE_NONE, 'Launch the shell.'));
        $this->getDefinition()->addOption(new InputOption('--process-isolation', null, InputOption::VALUE_NONE, 'Launch commands from shell as a separate processes.'));
        $this->getDefinition()->addOption(new InputOption('--env', '-e', InputOption::VALUE_REQUIRED, 'The Environment name.', $kernel->getEnvironment()));
        $this->getDefinition()->addOption(new InputOption('--no-debug', null, InputOption::VALUE_NONE, 'Switches off debug mode.'));
        $this->getDefinition()->addOption(new InputOption('--strategy', null, InputOption::VALUE_REQUIRED, 'Command registering strategy.'));
        }

    public function getKernel()
        {
        return $this->kernel;
        }

    public function doRun(InputInterface $input, OutputInterface $output)
        {
        $this->registerCommands($input->getParameterOption('--strategy', 'all'));
        if(true === $input->hasParameterOption(array('--shell', '-s')))
            {
            $shell = new Shell($this);
            $shell->setProcessIsolation($input->hasParameterOption(array('--process-isolation')));
            $shell->run();
            return 0;
            }
        return parent::doRun($input, $output);
        }

    protected function registerCommands($strategy)
        {
        $this->kernel->boot();
        if('none' === $strategy)
            {
            return;
            }
        foreach($this->kernel->getBundles() as $bundle)
            {
            if('project' === $strategy && false === strpos($bundle->getPath(), dirname(__DIR__).'/src/'))
                {
                continue;
                }
            if($bundle instanceof Bundle)
                {
                $bundle->registerCommands($this);
                }
            }
        }
    }