ede-php-autoload-list-namespaces.php

<?php
/**
 * Scans the Composer namespace mappings to obtain the correct
 * paths of packages that use psr-0 with target-dir.
 *
 * @see https://getcomposer.org/doc/04-schema.md#target-dir
 * {
 *   "autoload": {
 *      "psr-0": { "Symfony\\Component\\Finder\\": "" }
 *   },
 *   "target-dir": "Symfony/Component/Finder"
 * }
 *
 * Usage:
 * php ede-php-autoload-list-namespaces.php vendor/composer/autoload_namespaces.php
 */
$autoloadInformation = require $_SERVER['argv'][1];
echo array_reduce(array_map(function ($prefix, $directories) {
    return [$prefix, $directories];
}, array_keys($autoloadInformation), $autoloadInformation), function ($list, $package) {
    list($prefix, $directories) = $package;

    $prefix = addslashes($prefix);
    $directory = array_pop($directories);
    return $list . "(\"{$prefix}\" . \"{$directory}\") ";
}, "(") . ")";