My “really old” plugin can still take care of this (as long as you’re not using sidebar widgets):
http://guff.szub.net/2005/01/27/add-link-attribute/
add_filter('wp_list_categories','wp_rel_nofollow'); will do the trick easily enough for the categories.
There’s no filter on the wp_get_archives function that I can find though.
Bah! You and your crazy filters! ;)
(Where have I read that before…)
Let me share a personal quote from earlier this year with everyone:
Dammit, everything in WordPress should have a filter by now. Everything!!!
If that came true, I could stop linking to hacky plugins of mine written all the way back in 2005.
I’m using sidebar widgets.
I put the categories filter in the default-filters.php file, but it did not work. Does it go somewhere else?
The wp_rel_nofollow() filter appears to be broken in 2.5.1 — when I add the suggested line to default-filters.php, the category list rendered on my site’s homepage has escaped quotes:
<li class=\"cat-item cat-item-3\"><a href=\"http://example.com/foo\" title=\"View all posts filed under Colophon\" rel=\"nofollow\">Colophon</a> (10)
I worked around this bug by cloning the wp_rel_nofollow() function to a new name and removing this line from it:
$text = $wpdb->escape($text);
and then updating default-filters.php with my new function name:
add_filter('wp_list_categories','wp_rel_nofollow_mgm');
Voila! Category links are nofollowed and there are no ugly escaped-quote issues in the source.
