static function getMarkPatrolledLink()
{
global $wgRequest, $wgUser;
// Append a [Mark as Patrolled] link in certain cases
$markPatrolledLink = '';
$rcid = $wgRequest->getInt('rcid');
$fromRC = $wgRequest->getInt('fromrc');
if ($wgUser && $rcid > 0 && $fromRC && $wgUser->isAllowed('patrol')) {
$rc = RecentChange::newFromId($rcid);
if ($rc) {
$oldRevId = $rc->getAttribute('rc_last_oldid');
$newRevId = $rc->getAttribute('rc_this_oldid');
$diff = new DifferenceEngine(null, $oldRevId, $newRevId);
if ($diff->loadRevisionData()) {
$markPatrolledLink = $diff->markPatrolledLink();
} else {
throw new MWException("wikiHow internal error: we know there is an rcid ({$rcid}) and newrevid ({$newRevId}), but couldn't find the revision");
}
}
}
return $markPatrolledLink;
}
