composer/bin/composer

#!/usr/bin/env php
<?php

require __DIR__.'/../tests/bootstrap.php';

use Composer\Composer;
use Composer\Installer;
use Composer\Downloader;
use Composer\Repository;
use Composer\Package;
use Composer\Console\Application as ComposerApplication;

// initialize repository manager
$rm = new Repository\RepositoryManager();
$rm->setLocalRepository(new Repository\PlatformRepository(new Repository\FilesystemRepository('.composer/installed.json')));
$rm->setRepository('Packagist', new Repository\ComposerRepository('http://packagist.org'));

// initialize download manager
$dm = new Downloader\DownloadManager($preferSource = false);
$dm->setDownloader('git',  new Downloader\GitDownloader());
$dm->setDownloader('pear', new Downloader\PearDownloader());
$dm->setDownloader('zip',  new Downloader\ZipDownloader());

// initialize installation manager
$im = new Installer\InstallationManager();
$im->setInstaller('library', new Installer\LibraryInstaller('vendor', $dm, $rm->getLocalRepository()));

// load package
$loader  = new Package\Loader\JsonLoader();
$package = $loader->load('composer.json');

// initialize composer
$composer = new Composer();
$composer->setPackage($package);
$composer->setPackageLock(new Package\PackageLock('composer.lock'));
$composer->setRepositoryManager($rm);
$composer->setDownloadManager($dm);
$composer->setInstallationManager($im);

// run the command application
$application = new ComposerApplication($composer);
$application->run();