<?php
// $Id: enforce_revlog.module,v 1.1.2.1 2010-06-16 16:56:06 nancyw Exp $

/**
 * @file
 * Enforces the use of the revision log field.
 */

/**
 * Implements hook_nodeapi().
 */
function enforce_revlog_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL) {
  switch ($op) {
    case 'validate':
      // If revision is checked and log message is empty, complain.
      // An empty log for new content will be ignored.
      if ($node->revision && empty($node->log) && $node->nid) {
        if (user_access('administer nodes'))
          form_set_error('log', t('Please enter a revision log message or uncheck the revision checkbox.'));
        else
          form_set_error('log', t('Please enter a revision log message.'));
      }
      return;
  }
}