New markprompt_required setting for the authoring form

If markprompt_required is set the marks field in the authoring form
will be required and will show an error if it is left blank.

edit_aitext_form.php

@@ -63,7 +63,9 @@ protected function definition_inner($mform) {
         $mform->setType('markscheme', PARAM_RAW);
         $mform->setDefault('markscheme', get_config('qtype_aitext', 'defaultmarksscheme'));
         $mform->addHelpButton('markscheme', 'markscheme', 'qtype_aitext');
-        $mform->addRule('markscheme', get_string('markschememissing', 'qtype_aitext'), 'required');
+        if (get_config('qtype_aitext', 'markprompt_required')== 1) {
+            $mform->addRule('markscheme', get_string('markschememissing', 'qtype_aitext'), 'required');
+        }
         $models = explode(",", get_config('tool_aiconnect', 'model'));
         if (count($models) > 1 ) {
             $models = array_combine($models, $models);

lang/en/qtype_aitext.php

@@ -57,6 +57,8 @@
 $string['graderinfoheader'] = 'Grader information';
 $string['jsonprompt'] = 'JSon prompt';
 $string['jsonprompt_setting'] = 'Instructions sent to convert the returned value into json';
+$string['markprompt_required'] = 'Mark prompt required';
+$string['markprompt_required_setting'] = 'If set, when authoring a question a prompt asking for marking is a required field and will show an error if it is left empty';
 $string['markscheme'] = 'Mark scheme';
 $string['markscheme_help'] = 'This will tell the AI grader how to give a numerical grade to the student response. The total possible score is this question\'s \'Default mark\'';
 $string['markschememissing'] = 'The marke scheme is missing. Please enter a prompt, how to mark the users input';

settings.php

@@ -72,6 +72,12 @@
         new lang_string('use_local_ai_manager_setting', 'qtype_aitext'),
         0
     ));
+    $settings->add(new admin_setting_configcheckbox(
+        'qtype_aitext/markprompt_required',
+        new lang_string('markprompt_required', 'qtype_aitext'),
+        new lang_string('markprompt_required_setting', 'qtype_aitext'),
+        0
+    ));
 
 }