image field migrate alt to caption drush script

caption-drush-script.php

@@ -0,0 +1,47 @@
+<?php
+
+//
+// This example demonstrates how to write a drush
+// script. These scripts are run with the php:script command.
+//
+use Drush\Drush;
+
+// $this->output()->writeln("Hello world!");
+// $this->output()->writeln("The extra options/arguments to this command were:");
+// $this->output()->writeln(print_r($extra, true));
+
+//
+// We can check which site was bootstrapped via
+// the '@self' alias, which is defined only if
+// there is a bootstrapped site.
+//
+$self = Drush::aliasManager()->getSelf();;
+if (!$self->hasRoot()) {
+  $this->output()->writeln('No bootstrapped site.');
+}
+else {
+  $this->output()->writeln('The following site is bootstrapped:');
+  $this->output()->writeln(print_r($self->legacyRecord(), true));
+  
+  // $nids = \Drupal::entityQuery('node')->condition('type','projet')->execute();
+  $nodes = \Drupal::entityTypeManager()->getStorage('node')
+    ->loadByProperties(['type' => 'projet']);
+  
+  foreach ($nodes as $nid => $node) {
+    /** @var Drupal\file\Plugin\Field\FieldType\FileFieldItemList $field_photo */
+    $field_photo = $node->get('field_photo');
+    $itemlist = $field_photo->getValue();
+    /** @var Drupal\image_field_caption\ImageCaptionItem $field_item */
+    foreach ($itemlist as $key => $field_item) {
+      if (!empty($field_item['alt']) && (!isset($field_item['caption']) || empty($field_item['caption']))) {
+        $field_item['image_field_caption']['value'] = $field_item['alt'];
+        $field_item['image_field_caption']['format'] = 'plain_text';
+        $itemlist[$key] = $field_item;
+      }
+    }
+    // $field_photo->setValue($itemlist);
+    $node->set('field_photo', $itemlist);
+    $node->save();
+  }
+}
+