first commit

plugins/fields/usergrouplist/tmpl/usergrouplist.php

@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * @package     Joomla.Plugin
+ * @subpackage  Fields.Usergrouplist
+ *
+ * @copyright   (C) 2017 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+defined('_JEXEC') or die;
+
+use Joomla\Component\Users\Administrator\Helper\UsersHelper;
+
+$value = $field->value;
+
+if ($value == '') {
+    return;
+}
+
+$value  = (array) $value;
+$texts  = [];
+$groups = UsersHelper::getGroups();
+
+foreach ($groups as $group) {
+    if (in_array($group->value, $value)) {
+        $texts[] = htmlentities(trim($group->text, '- '));
+    }
+}
+
+echo htmlentities(implode(', ', $texts));