MDL-76583 core: Update uses of external_* classes

blocks/html/block_html.php

@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
+use core_external\util as external_util;
+
 /**
  * Form for editing HTML block instances.
  *
@@ -21,9 +23,7 @@
  * @copyright 1999 onwards Martin Dougiamas (http://dougiamas.com)
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-
 class block_html extends block_base {
-
     function init() {
         $this->title = get_string('pluginname', 'block_html');
     }
@@ -87,9 +87,6 @@ class block_html extends block_base {
     }
 
     public function get_content_for_external($output) {
-        global $CFG;
-        require_once($CFG->libdir . '/externallib.php');
-
         $bc = new stdClass;
         $bc->title = null;
         $bc->content = '';
@@ -113,8 +110,15 @@ class block_html extends block_base {
             if (isset($this->config->format)) {
                 $format = $this->config->format;
             }
-            list($bc->content, $bc->contentformat) =
-                external_format_text($this->config->text, $format, $this->context, 'block_html', 'content', null, $filteropt);
+            [$bc->content, $bc->contentformat] = \core_external\util::format_text(
+                $this->config->text,
+                $format,
+                $this->context,
+                'block_html',
+                'content',
+                null,
+                $filteropt
+            );
             $bc->files = external_util::get_area_files($this->context->id, 'block_html', 'content', false, false);
 
         }