addInterpolationData example

  protected function copyScaffold(ScaffoldFilePath $destination, IOInterface $io) {
    $interpolator = $destination->getInterpolator();
    $this->source->addInterpolationData($interpolator);
    if (file_put_contents($destination->fullPath(), $this->contents()) === FALSE) {
      throw new \RuntimeException($interpolator->interpolate("Could not copy source file <info>[src-rel-path]</info> to <info>[dest-rel-path]</info>!"));
    }
    $io->write($interpolator->interpolate(" - Copy <info>[dest-rel-path]</info> from <info>[src-rel-path]</info>"));
    return new ScaffoldResult($destination, $this->overwrite);
  }

  /** * Symlinks the scaffold file. * * @param \Drupal\Composer\Plugin\Scaffold\ScaffoldFilePath $destination * Scaffold file to process. * @param \Composer\IO\IOInterface $io * IOInterface to writing to. * * @return \Drupal\Composer\Plugin\Scaffold\Operations\ScaffoldResult * The scaffold result. */

    if (!$this->managed) {
      $message = ' - <info>NOTICE</info> Modifying existing file at <info>[dest-rel-path]</info>.';
      if (!file_exists($destination_path)) {
        $message = ' - <info>NOTICE</info> Creating a new file at <info>[dest-rel-path]</info>.';
      }
      $message .= ' Examine the contents and ensure that it came out correctly.';
      $io->write($interpolator->interpolate($message));
    }

    // Notify that we are prepending, if there is prepend data.     if (!empty($this->prepend)) {
      $this->prepend->addInterpolationData($interpolator, 'prepend');
      $io->write($interpolator->interpolate(" - Prepend to <info>[dest-rel-path]</info> from <info>[prepend-rel-path]</info>"));
    }
    // Notify that we are appending, if there is append data.     if (!empty($this->append)) {
      $this->append->addInterpolationData($interpolator, 'append');
      $io->write($interpolator->interpolate(" - Append to <info>[dest-rel-path]</info> from <info>[append-rel-path]</info>"));
    }

    // Write the resulting data     file_put_contents($destination_path, $this->contents());

    

  public function getInterpolator($name_prefix = '') {
    $interpolator = new Interpolator();
    $this->addInterpolationData($interpolator, $name_prefix);
    return $interpolator;
  }

}