Hi all,

Please find attached a patch to add a new function org-agenda-filter-set
which allows you to specify the same strings as in the org-agenda-filter
prompt directly from Lisp.  It allows you to do things like:

    (org-agenda-filter-set "-@foo-bar")

Before, this would have involved doing more of the heavy lifting
manually using org-agenda-filter-apply.

Best regards,
Stefan Kangas