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 installer
$installer = new Installer\LibraryInstaller('vendor', $preferSource = true);
$installer->setDownloader('git',  new Downloader\GitDownloader());
$installer->setDownloader('pear', new Downloader\PearDownloader());
$installer->setDownloader('zip',  new Downloader\ZipDownloader());

// initialize composer
$composer = new Composer();
$composer->setInstaller('library', $installer);
$composer->setRepository('Platform', new Repository\PlatformRepository());
$composer->setRepository('Packagist', new Repository\ComposerRepository('http://packagist.org'));

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

// initialize lock
$packageLock = new Package\PackageLock('composer.lock');

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