Issue #3356929 by Wim Leers, kevinquillen: Provide an upgrade path from "codesnippet" contrib CKEditor 4 plugin to "CodeBlock" core CKEditor 5 plugin

core/modules/ckeditor5/src/Plugin/CKEditor4To5Upgrade/Contrib.php

@@ -4,6 +4,8 @@ declare(strict_types=1);
 
 namespace Drupal\ckeditor5\Plugin\CKEditor4To5Upgrade;
 
+// cspell:ignore codesnippet
+
 use Drupal\ckeditor5\HTMLRestrictions;
 use Drupal\ckeditor5\Plugin\CKEditor4To5UpgradePluginInterface;
 use Drupal\Core\Plugin\PluginBase;
@@ -15,9 +17,11 @@ use Drupal\filter\FilterFormatInterface;
  * @CKEditor4To5Upgrade(
  *   id = "contrib",
  *   cke4_buttons = {
- *     "Code"
+ *     "Code",
+ *     "CodeSnippet",
  *   },
  *   cke4_plugin_settings = {
+ *     "codesnippet",
  *   },
  *   cke5_plugin_elements_subset_configuration = {
  *   }
@@ -37,6 +41,10 @@ class Contrib extends PluginBase implements CKEditor4To5UpgradePluginInterface {
       case 'Code':
         return ['code'];
 
+      // @see https://www.drupal.org/project/codesnippet
+      case 'CodeSnippet':
+        return ['codeBlock'];
+
       default:
         throw new \OutOfBoundsException();
     }
@@ -46,7 +54,25 @@ class Contrib extends PluginBase implements CKEditor4To5UpgradePluginInterface {
    * {@inheritdoc}
    */
   public function mapCKEditor4SettingsToCKEditor5Configuration(string $cke4_plugin_id, array $cke4_plugin_settings): ?array {
-    throw new \OutOfBoundsException();
+    switch ($cke4_plugin_id) {
+      case 'codesnippet':
+        $languages = [];
+        $enabled_cke4_languages = array_filter($cke4_plugin_settings['highlight_languages']);
+        foreach ($enabled_cke4_languages as $language) {
+          $languages[] = [
+            'language' => $language,
+            'label' => $language,
+          ];
+        }
+        return [
+          'ckeditor5_codeBlock' => [
+            'languages' => $languages,
+          ],
+        ];
+
+      default:
+        throw new \OutOfBoundsException();
+    }
   }
 
   /**

core/modules/ckeditor5/tests/src/Kernel/SmartDefaultSettingsTest.php

@@ -4,6 +4,8 @@ declare(strict_types = 1);
 
 namespace Drupal\Tests\ckeditor5\Kernel;
 
+// cspell:ignore arta codesnippet
+
 use Drupal\ckeditor5\HTMLRestrictions;
 use Drupal\Component\Render\FormattableMarkup;
 use Drupal\Component\Utility\NestedArray;
@@ -423,9 +425,50 @@ class SmartDefaultSettingsTest extends KernelTestBase {
                 ],
               ],
             ],
+            1 => [
+              [
+                'name' => 'Contributed modules providing buttons with settings',
+                'items' => [
+                  // @see https://www.drupal.org/project/codesnippet
+                  'CodeSnippet',
+                ],
+              ],
+            ],
+          ],
+        ],
+        'plugins' => [
+          'codesnippet' => [
+            'highlight_style' => 'arta',
+            'highlight_languages' => [
+              'cs' => 'cs',
+              'cpp' => 'cpp',
+              'coffeescript' => 'coffeescript',
+              'css' => 'css',
+              'diff' => 'diff',
+              'html' => 'html',
+              'http' => 'http',
+              'ini' => 'ini',
+              'java' => 'java',
+              'javascript' => 'javascript',
+              'json' => 'json',
+              'makefile' => 'makefile',
+              'markdown' => 'markdown',
+              'nginx' => 'nginx',
+              'objectivec' => 'objectivec',
+              'perl' => 'perl',
+              'php' => 'php',
+              'python' => 'python',
+              'ruby' => 'ruby',
+              'sql' => 'sql',
+              'vbscript' => 'vbscript',
+              'xhtml' => 'xhtml',
+              'xml' => 'xml',
+              // These 2 languages have been disabled.
+              'apache' => 0,
+              'bash' => 0,
+            ],
           ],
         ],
-        'plugins' => [],
       ],
     ])->setSyncing(TRUE)->save();
   }
@@ -1452,9 +1495,39 @@ class SmartDefaultSettingsTest extends KernelTestBase {
         'toolbar' => [
           'items' => [
             'code',
+            '|',
+            'codeBlock',
+          ],
+        ],
+        'plugins' => [
+          'ckeditor5_codeBlock' => [
+            'languages' => [
+              ['label' => 'cs', 'language' => 'cs'],
+              ['label' => 'cpp', 'language' => 'cpp'],
+              ['label' => 'coffeescript', 'language' => 'coffeescript'],
+              ['label' => 'css', 'language' => 'css'],
+              ['label' => 'diff', 'language' => 'diff'],
+              ['label' => 'html', 'language' => 'html'],
+              ['label' => 'http', 'language' => 'http'],
+              ['label' => 'ini', 'language' => 'ini'],
+              ['label' => 'java', 'language' => 'java'],
+              ['label' => 'javascript', 'language' => 'javascript'],
+              ['label' => 'json', 'language' => 'json'],
+              ['label' => 'makefile', 'language' => 'makefile'],
+              ['label' => 'markdown', 'language' => 'markdown'],
+              ['label' => 'nginx', 'language' => 'nginx'],
+              ['label' => 'objectivec', 'language' => 'objectivec'],
+              ['label' => 'perl', 'language' => 'perl'],
+              ['label' => 'php', 'language' => 'php'],
+              ['label' => 'python', 'language' => 'python'],
+              ['label' => 'ruby', 'language' => 'ruby'],
+              ['label' => 'sql', 'language' => 'sql'],
+              ['label' => 'vbscript', 'language' => 'vbscript'],
+              ['label' => 'xhtml', 'language' => 'xhtml'],
+              ['label' => 'xml', 'language' => 'xml'],
+            ],
           ],
         ],
-        'plugins' => [],
       ],
       'expected_superset' => '',
       'expected_fundamental_compatibility_violations' => [],