(defun my-org-drill-file-names-in-howm ()
"Return list of absolute filenames of org-drill files in howm"
(delete-dups
(mapcar #'car (howm-grep "\:drill\:"
(howm-files-in-directory howm-directory)))))(use-package org-drill
:custom
(setq org-drill-scope (my-org-drill-file-names-in-howm))
:after howm)