+(deffoo nnir-request-expire-articles (articles group &optional server force)
+ (if force
+ (let ((articles-by-group (nnir-categorize
+ articles nnir-article-group nnir-article-ids))
+ not-deleted)
+ (while (not (null articles-by-group))
+ (let* ((group-articles (pop articles-by-group))
+ (artgroup (car group-articles))
+ (articleids (cadr group-articles))
+ (artlist (sort (mapcar 'cdr articleids) '<)))
+ (unless (gnus-check-backend-function 'request-expire-articles
+ artgroup)
+ (error "The group %s does not support article deletion" artgroup))
+ (unless (gnus-check-server (gnus-find-method-for-group artgroup))
+ (error "Couldn't open server for group %s" artgroup))
+ (push (gnus-request-expire-articles
+ artlist artgroup force)
+ not-deleted)))
+ (sort (delq nil not-deleted) '<))
+ articles))
+