--- /dev/null
+/**
+ * Implements hook_file_move().
+ */
+function {{ machine_name }}_file_move($file, $source) {
+ $file_user = user_load($file->uid);
+ // Make sure that the file name starts with the owner's user name.
+ if (strpos($file->filename, $file_user->name) !== 0) {
+ $file->filename = $file_user->name . '_' . $file->filename;
+ $file->save();
+
+ watchdog('file', t('Moved file %source has been renamed to %destination', array('%source' => $source->filename, '%destination' => $file->filename)));
+ }
+}