A better psysh/rc.php that automatically loads your composer autoloader

rc.php

<?php

/**
 * This is a better Psysh rc.php
 */

$add_composer_autoloader = function(array $config) {
	static $was_run = false;
	if ($was_run) {
		return $config;
	} else {
		$was_run = true;
	}

	$dir = realpath(getcwd());
	while (true) {
		$composer_json = "$dir/composer.json";
		if (is_readable($composer_json)) {
			$autoloader = "$dir/vendor/autoload.php";

			// Check for alternate vendor dir
			$composer = json_decode(file_get_contents($composer_json), true);
			if (isset($composer['config']) && isset($composer['config']['vendor-dir'])) {
				$vendor_dir = $composer['config']['vendor-dir'];
				$autoloader = "$dir/$vendor_dir/autoload.php";
			}

			if (is_readable($autoloader)) {
				if (!isset($config["defaultIncludes"])) {
					$config["defaultIncludes"] = [];
				}
				$config["defaultIncludes"][] = $autoloader;
				echo "Added Composer autoloader: $autoloader\n";
				return $config;
			}
		}

		$last_dir = $dir;
		$dir = realpath("$dir/../");
		if ($dir === false || $dir === $last_dir) break;
	}
	return $config;
};

$config = [
	// "Default includes" will be included once at the beginning of every PsySH
	// session. This is a good place to add autoloaders for your favorite
	// libraries.
	'defaultIncludes' => [
		// Use this line to add your user's global composer autoloader
		// __DIR__.'/../.composer/vendor/autoload.php',
	],

	// While PsySH ships with a bunch of great commands, it's possible to add
	// your own for even more awesome. Any Psy command added here will be
	// available in your Psy shell sessions.
	'commands' => [],

	// PsySH ships with presenters for scalars, resources, arrays, and objects.
	// But you're not limited to those presenters. You can enable additional
	// presenters (like the included MongoCursorPresenter), or write your own!
	'presenters' => [
		// new \Psy\Presenter\MongoCursorPresenter,
	],
];

return $add_composer_autoloader($config);

awesome gist! Thanks!