MagentoHackathon\Composer\Magento\Plugin::saveVendorDirPath PHP Method

    private function saveVendorDirPath(Composer $composer)
    {
        $magentoDir = $this->installer->getTargetDir();
        $vendorDirPath = $this->filesystem->findShortestPath($magentoDir, realpath($composer->getConfig()->get('vendor-dir')), true);
        $vendorPathFile = $magentoDir . '/app/etc/vendor_path.php';
        $content = <<<AUTOLOAD
<?php
/**
 * Path to Composer vendor directory
 */
return '{$vendorDirPath}';

AUTOLOAD;
        file_put_contents($vendorPathFile, $content);
    }