add a button in post form to browse through repository

classes/post_form.php

@@ -58,7 +58,7 @@ public function definition() {
         $modform->addRule('subject', get_string('maximumchars', '', 255), 'maxlength', 255, 'client');
 
         // The message.
-        $modform->addElement('editor', 'message', get_string('message', 'moodleoverflow'), null);
+        $modform->addElement('editor', 'message', get_string('message', 'moodleoverflow'), null, self::editor_options($modcontext, (empty($post->id) ? null : $post->id)));
         $modform->setType('message', PARAM_RAW);
         $modform->addRule('message', get_string('required'), 'required', null, 'client');
 
@@ -141,6 +141,25 @@ public static function attachment_options($moodleoverflow) {
             'return_types' => FILE_INTERNAL | FILE_CONTROLLED_LINK,
         ];
     }
+
+    /**
+     * Returns the options array to use in forum text editor
+     *
+     * @param context_module $context
+     * @param int $postid post id, use null when adding new post
+     * @return array
+     */
+    public static function editor_options(context_module $context, $postid) {
+        global $COURSE, $PAGE, $CFG;
+        $maxbytes = get_user_max_upload_file_size($PAGE->context, $CFG->maxbytes, $COURSE->maxbytes);
+        return array(
+            'maxfiles' => EDITOR_UNLIMITED_FILES,
+            'maxbytes' => $maxbytes,
+            'trusttext'=> true,
+            'return_types'=> FILE_INTERNAL | FILE_EXTERNAL,
+            'subdirs' => file_area_contains_subdirs($context, 'mod_forum', 'post', $postid)
+        );
+    }
 }