MDL-48012 core: added pre_*_delete hooks

course/lib.php

@@ -1652,6 +1652,15 @@ function course_delete_module($cmid) {
             "Cannot delete this module as the function {$modulename}_delete_instance is missing in mod/$modulename/lib.php.");
     }
 
+    // Allow plugins to use this course module before we completely delete it.
+    if ($pluginsfunction = get_plugins_with_function('pre_course_module_delete')) {
+        foreach ($pluginsfunction as $plugintype => $plugins) {
+            foreach ($plugins as $pluginfunction) {
+                $pluginfunction($cm);
+            }
+        }
+    }
+
     // Delete activity context questions and question categories.
     question_delete_activity($cm);
 

lib/blocklib.php

@@ -2041,6 +2041,15 @@ function blocks_name_allowed_in_format($name, $pageformat) {
 function blocks_delete_instance($instance, $nolongerused = false, $skipblockstables = false) {
     global $DB;
 
+    // Allow plugins to use this block before we completely delete it.
+    if ($pluginsfunction = get_plugins_with_function('pre_block_delete')) {
+        foreach ($pluginsfunction as $plugintype => $plugins) {
+            foreach ($plugins as $pluginfunction) {
+                $pluginfunction($instance);
+            }
+        }
+    }
+
     if ($block = block_instance($instance->blockname, $instance)) {
         $block->instance_delete();
     }

lib/coursecatlib.php

@@ -1670,6 +1670,16 @@ class coursecat implements renderable, cacheable_object, IteratorAggregate {
         // Make sure we won't timeout when deleting a lot of courses.
         $settimeout = core_php_time_limit::raise();
 
+        // Allow plugins to use this category before we completely delete it.
+        if ($pluginsfunction = get_plugins_with_function('pre_course_category_delete')) {
+            $category = $this->get_db_record();
+            foreach ($pluginsfunction as $plugintype => $plugins) {
+                foreach ($plugins as $pluginfunction) {
+                    $pluginfunction($category);
+                }
+            }
+        }
+
         $deletedcourses = array();
 
         // Get children. Note, we don't want to use cache here because it would be rebuilt too often.

lib/moodlelib.php

@@ -3928,6 +3928,15 @@ function delete_user(stdClass $user) {
         return false;
     }
 
+    // Allow plugins to use this user object before we completely delete it.
+    if ($pluginsfunction = get_plugins_with_function('pre_user_delete')) {
+        foreach ($pluginsfunction as $plugintype => $plugins) {
+            foreach ($plugins as $pluginfunction) {
+                $pluginfunction($user);
+            }
+        }
+    }
+
     // Keep user record before updating it, as we have to pass this to user_deleted event.
     $olduser = clone $user;
 
@@ -4677,6 +4686,15 @@ function delete_course($courseorid, $showfeedback = true) {
         return false;
     }
 
+    // Allow plugins to use this course before we completely delete it.
+    if ($pluginsfunction = get_plugins_with_function('pre_course_delete')) {
+        foreach ($pluginsfunction as $plugintype => $plugins) {
+            foreach ($plugins as $pluginfunction) {
+                $pluginfunction($course);
+            }
+        }
+    }
+
     // Make the course completely empty.
     remove_course_contents($courseid, $showfeedback);