class ManageOptions

class ManageOptions {
    
    /**
     * The Composer service.
     *
     * @var \Composer\Composer
     */
    protected $composer;
    
    /**
     * ManageOptions constructor.
     *
     * @param \Composer\Composer $composer
     *   The Composer service.
     */
    public function __construct(Composer $composer) {
        $this->composer = $composer;
    }
    
    /**
     * Gets the root-level scaffold options for this project.
     *
     * @return \Drupal\Composer\Plugin\Scaffold\ScaffoldOptions
     *   The scaffold options object.
     */
    public function getOptions() {
        return $this->packageOptions($this->composer
            ->getPackage());
    }
    
    /**
     * Gets the scaffold options for the stipulated project.
     *
     * @param \Composer\Package\PackageInterface $package
     *   The package to fetch the scaffold options from.
     *
     * @return \Drupal\Composer\Plugin\Scaffold\ScaffoldOptions
     *   The scaffold options object.
     */
    public function packageOptions(PackageInterface $package) {
        return ScaffoldOptions::create($package->getExtra());
    }
    
    /**
     * Creates an interpolator for the 'locations' element.
     *
     * The interpolator returned will replace a path string with the tokens
     * defined in the 'locations' element.
     *
     * Note that only the root package may define locations.
     *
     * @return \Drupal\Composer\Plugin\Scaffold\Interpolator
     *   Interpolator that will do replacements in a string using tokens in
     *   'locations' element.
     */
    public function getLocationReplacements() {
        return (new Interpolator())->setData($this->ensureLocations());
    }
    
    /**
     * Ensures that all of the locations defined in the scaffold files exist.
     *
     * Create them on the filesystem if they do not.
     */
    protected function ensureLocations() {
        $fs = new Filesystem();
        $locations = $this->getOptions()
            ->locations() + [
            'web_root' => './',
        ];
        $locations = array_map(function ($location) use ($fs) {
            $fs->ensureDirectoryExists($location);
            $location = realpath($location);
            return $location;
        }, $locations);
        return $locations;
    }

}