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Editing: ListCommand.php

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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Console\Command;

use Symfony\Component\Console\Helper\DescriptorHelper;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Input\InputDefinition;

/**
 * ListCommand displays the list of all available commands for the application.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class ListCommand extends Command
{
    /**
     * {@inheritdoc}
     */
    protected function configure()
    {
        $this
            ->setName('list')
            ->setDefinition($this->createDefinition())
            ->setDescription('Lists commands')
            ->setHelp(<<<'EOF'
The <info>%command.name%</info> command lists all commands:

<info>php %command.full_name%</info>

You can also display the commands for a specific namespace:

<info>php %command.full_name% test</info>

You can also output the information in other formats by using the <comment>--format</comment> option:

<info>php %command.full_name% --format=xml</info>

It's also possible to get raw list of commands (useful for embedding command runner):

<info>php %command.full_name% --raw</info>
EOF
            )
        ;
    }

/**
     * {@inheritdoc}
     */
    public function getNativeDefinition()
    {
        return $this->createDefinition();
    }

/**
     * {@inheritdoc}
     */
    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $helper = new DescriptorHelper();
        $helper->describe($output, $this->getApplication(), array(
            'format' => $input->getOption('format'),
            'raw_text' => $input->getOption('raw'),
            'namespace' => $input->getArgument('namespace'),
        ));
    }

/**
     * {@inheritdoc}
     */
    private function createDefinition()
    {
        return new InputDefinition(array(
            new InputArgument('namespace', InputArgument::OPTIONAL, 'The namespace name'),
            new InputOption('raw', null, InputOption::VALUE_NONE, 'To output raw command list'),
            new InputOption('format', null, InputOption::VALUE_REQUIRED, 'The output format (txt, xml, json, or md)', 'txt'),
        ));
    }
}

Editing: ListCommand.php

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