Chris@0: <?php
Chris@0: 
Chris@0: /**
Chris@0:  * @file
Chris@0:  * Provides migration from other Drupal sites.
Chris@0:  */
Chris@0: 
Chris@18: use Drupal\Core\Url;
Chris@0: use Drupal\Core\Database\DatabaseExceptionWrapper;
Chris@0: use Drupal\Core\Routing\RouteMatchInterface;
Chris@0: use Drupal\migrate\Exception\RequirementsException;
Chris@0: use Drupal\migrate\MigrateExecutable;
Chris@0: use Drupal\migrate\Plugin\RequirementsInterface;
Chris@0: 
Chris@0: /**
Chris@0:  * Implements hook_help().
Chris@0:  */
Chris@0: function migrate_drupal_help($route_name, RouteMatchInterface $route_match) {
Chris@0:   switch ($route_name) {
Chris@0:     case 'help.page.migrate_drupal':
Chris@0:       $output = '';
Chris@0:       $output .= '<h3>' . t('About') . '</h3>';
Chris@18:       $output .= '<p>' . t('The Migrate Drupal module provides a framework based on the <a href=":migrate">Migrate module</a> to facilitate migration from a Drupal (6, 7, or 8) site to your website. It does not provide a user interface. For more information, see the <a href=":migrate_drupal">online documentation for the Migrate Drupal module</a>.', [':migrate' => Url::fromRoute('help.page', ['name' => 'migrate'])->toString(), ':migrate_drupal' => 'https://www.drupal.org/documentation/modules/migrate_drupal']) . '</p>';
Chris@0:       return $output;
Chris@0:   }
Chris@0: }
Chris@0: 
Chris@0: /**
Chris@0:  * Implements hook_migration_plugins_alter().
Chris@0:  */
Chris@0: function migrate_drupal_migration_plugins_alter(&$definitions) {
Chris@0:   // This is why the deriver can't do this: the 'd6_taxonomy_vocabulary'
Chris@0:   // definition is not available to the deriver as it is running inside
Chris@0:   // getDefinitions().
Chris@0:   if (isset($definitions['d6_taxonomy_vocabulary'])) {
Chris@0:     $vocabulary_migration_definition = [
Chris@0:       'source' => [
Chris@0:         'ignore_map' => TRUE,
Chris@0:         'plugin' => 'd6_taxonomy_vocabulary',
Chris@0:       ],
Chris@0:       'destination' => [
Chris@0:         'plugin' => 'null',
Chris@0:       ],
Chris@14:       'idMap' => [
Chris@14:         'plugin' => 'null',
Chris@14:       ],
Chris@0:     ];
Chris@0:     $vocabulary_migration = \Drupal::service('plugin.manager.migration')->createStubMigration($vocabulary_migration_definition);
Chris@0: 
Chris@0:     try {
Chris@0:       $source_plugin = $vocabulary_migration->getSourcePlugin();
Chris@0:       if ($source_plugin instanceof RequirementsInterface) {
Chris@0:         $source_plugin->checkRequirements();
Chris@0:       }
Chris@14:       $executable = new MigrateExecutable($vocabulary_migration);
Chris@0:       $process = ['vid' => $definitions['d6_taxonomy_vocabulary']['process']['vid']];
Chris@0:       foreach ($source_plugin as $row) {
Chris@0:         $executable->processRow($row, $process);
Chris@0:         $source_vid = $row->getSourceProperty('vid');
Chris@0:         $plugin_ids = ['d6_term_node:' . $source_vid, 'd6_term_node_revision:' . $source_vid];
Chris@0:         foreach ($plugin_ids as $plugin_id) {
Chris@0:           // Match the field name derivation in d6_vocabulary_field.yml.
Chris@0:           $field_name = substr('field_' . $row->getDestinationProperty('vid'), 0, 32);
Chris@0: 
Chris@0:           // The Forum module is expecting 'taxonomy_forums' as the field name
Chris@0:           // for the forum nodes. The 'forum_vocabulary' source property is
Chris@0:           // evaluated in Drupal\taxonomy\Plugin\migrate\source\d6\Vocabulary
Chris@0:           // and is set to true if the vocabulary vid being migrated is the
Chris@0:           // same as the one in the 'forum_nav_vocabulary' variable on the
Chris@0:           // source site.
Chris@0:           $destination_vid = $row->getSourceProperty('forum_vocabulary') ? 'taxonomy_forums' : $field_name;
Chris@0:           $definitions[$plugin_id]['process'][$destination_vid] = 'tid';
Chris@0:         }
Chris@0:       }
Chris@0:     }
Chris@0:     catch (RequirementsException $e) {
Chris@0:       // This code currently runs whenever the definitions are being loaded and
Chris@0:       // if you have a Drupal 7 source site then the requirements will not be
Chris@0:       // met for the d6_taxonomy_vocabulary migration.
Chris@0:     }
Chris@0:     catch (DatabaseExceptionWrapper $e) {
Chris@0:       // When the definitions are loaded it is possible the tables will not
Chris@0:       // exist.
Chris@0:     }
Chris@0: 
Chris@0:   }
Chris@0: }