limit rss description

[Budget101]

Originally Posted by Paul M

There is no way to limit it without using a plugin (as we do here).

This is a simplfied version of what we do ;

Hook: external_query

unset($vbulletin->GPC['fulldesc']);
$vbulletin->options['threadpreview'] = 200;
$hook_query_fields .= ",LEFT(post.pagetext,400) AS message";

What can we add to this to make it work on Blog Feeds as well??