composer/src/Composer/Command/DebugPackagesCommand.php

<?php

/*
 * This file is part of Composer.
 *
 * (c) Nils Adermann <naderman@naderman.de>
 *     Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Composer\Command;

use Composer\Autoload\AutoloadGenerator;
use Composer\DependencyResolver;
use Composer\DependencyResolver\Pool;
use Composer\DependencyResolver\Request;
use Composer\DependencyResolver\Operation;
use Composer\Package\LinkConstraint\VersionConstraint;
use Composer\Repository\PlatformRepository;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

/**
 * @author Jordi Boggiano <j.boggiano@seld.be>
 */
class DebugPackagesCommand extends Command
{
    protected function configure()
    {
        $this
            ->setName('debug:packages')
            ->setDescription('Lists all existing packages and their version')
            ->setHelp(<<<EOT
<info>php composer debug:packages</info>

EOT
            )
        ;
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $composer = $this->getComposer();

        // create local repo, this contains all packages that are installed in the local project
        $localRepo           = $composer->getRepositoryManager()->getLocalRepository();
        // create installed repo, this contains all local packages + platform packages (php & extensions)
        $installedRepo       = new PlatformRepository($localRepo);

        foreach ($installedRepo->getPackages() as $package) {
            $output->writeln('installed: '.$package->getName().' '.$package->getVersion());
        }

        foreach ($composer->getRepositoryManager()->getRepositories() as $repository) {
            foreach ($repository->getPackages() as $package) {
                $output->writeln('available: '.$package->getName().' '.$package->getVersion());
            }
        }
    }
}