first commit

media/com_content/js/admin-article-readmore.js

@@ -0,0 +1,29 @@
+import { JoomlaEditor, JoomlaEditorButton } from 'editor-api';
+import JoomlaDialog from 'joomla.dialog';
+
+/**
+ * @copyright  (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license    GNU General Public License version 2 or later; see LICENSE.txt
+ */
+const insertReadmoreHandler = editor => {
+  const content = editor.getValue();
+  if (!content) {
+    editor.replaceSelection('<hr id="system-readmore">');
+  } else if (content && !content.match(/<hr\s+id=("|')system-readmore("|')\s*\/*>/i)) {
+    editor.replaceSelection('<hr id="system-readmore">');
+  } else {
+    JoomlaDialog.alert(Joomla.Text._('PLG_READMORE_ALREADY_EXISTS'));
+  }
+};
+
+// @TODO: Remove in Joomla 6
+window.insertReadmore = () => {
+  // eslint-disable-next-line no-console
+  console.warn('Method window.insertReadmore() is deprecated, use button action "insert-readmore."');
+  const editor = JoomlaEditor.getActive();
+  if (!editor) {
+    throw new Error('An active editor are not available');
+  }
+  insertReadmoreHandler(editor);
+};
+JoomlaEditorButton.registerAction('insert-readmore', insertReadmoreHandler);