+
+;;;
+;;; Group compaction. -- dvl
+;;;
+
+(defun gnus-group-compact-group (group)
+ "Compact the current group.
+Compaction means removing gaps between article numbers. Hence, this
+operation is only meaningful for back ends using one file per article
+\(e.g. nnml).
+
+Note: currently only implemented in nnml."
+ (interactive (list (gnus-group-group-name)))
+ (unless group
+ (error "No group to compact"))
+ (unless (gnus-check-backend-function 'request-compact-group group)
+ (error "This back end does not support group compaction"))
+ (let ((group-decoded (gnus-group-decoded-name group)))
+ (gnus-message 6 "\
+Compacting group %s... (this may take a long time)"
+ group-decoded)
+ (prog1
+ (if (not (gnus-request-compact-group group))
+ (gnus-error 3 "Couldn't compact group %s" group-decoded)
+ (gnus-message 6 "Compacting group %s...done" group-decoded)
+ t)
+ ;; Invalidate the "original article" buffer which might be out of date.
+ ;; #### NOTE: Yes, this might be a bit rude, but since compaction
+ ;; #### will not happen very often, I think this is acceptable.
+ (let ((original (get-buffer gnus-original-article-buffer)))
+ (and original (gnus-kill-buffer original)))
+ ;; Update the group line to reflect new information (art number etc).
+ (gnus-group-update-group-line))))
+