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    <h3>Editing: ListCommand.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * 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\Completion\CompletionInput;
use Symfony\Component\Console\Completion\CompletionSuggestions;
use Symfony\Component\Console\Descriptor\ApplicationDescription;
use Symfony\Component\Console\Helper\DescriptorHelper;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;

/**
 * ListCommand displays the list of all available commands for the application.
 *
 * @author Fabien Potencier &lt;fabien@symfony.com&gt;
 */
class ListCommand extends Command
{
    /**
     * {@inheritdoc}
     */
    protected function configure()
    {
        $this
            -&gt;setName('list')
            -&gt;setDefinition([
                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'),
                new InputOption('short', null, InputOption::VALUE_NONE, 'To skip describing commands\' arguments'),
            ])
            -&gt;setDescription('List commands')
            -&gt;setHelp(&lt;&lt;&lt;'EOF'
The &lt;info&gt;%command.name%&lt;/info&gt; command lists all commands:

  &lt;info&gt;%command.full_name%&lt;/info&gt;

You can also display the commands for a specific namespace:

  &lt;info&gt;%command.full_name% test&lt;/info&gt;

You can also output the information in other formats by using the &lt;comment&gt;--format&lt;/comment&gt; option:

  &lt;info&gt;%command.full_name% --format=xml&lt;/info&gt;

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

  &lt;info&gt;%command.full_name% --raw&lt;/info&gt;
EOF
            )
        ;
    }

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

        return 0;
    }

    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
    {
        if ($input-&gt;mustSuggestArgumentValuesFor('namespace')) {
            $descriptor = new ApplicationDescription($this-&gt;getApplication());
            $suggestions-&gt;suggestValues(array_keys($descriptor-&gt;getNamespaces()));

            return;
        }

        if ($input-&gt;mustSuggestOptionValuesFor('format')) {
            $helper = new DescriptorHelper();
            $suggestions-&gt;suggestValues($helper-&gt;getFormats());
        }
    }
}
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