* bug#17236: undo-only hangs when nils double up
@ 2014-04-10 16:15 Barry OReilly
2014-04-10 17:23 ` Andreas Schwab
2014-04-10 20:30 ` Stefan Monnier
0 siblings, 2 replies; 4+ messages in thread
From: Barry OReilly @ 2014-04-10 16:15 UTC (permalink / raw)
To: 17236
When there are consecutive nils in buffer-undo-list, undo-only can
hang. For example, if buffer-undo-list begins with (nil nil ...), then
the first undo-only succeeds, changes nothing, and inserts an identity
mapping into undo-equiv-table. The second undo-only hangs because the
identity mapping causes an infinite recursive lookup in
undo-equiv-table.
Perhaps the bug is in the Emacs package (Evil in this case) that
doubles up the nils. I ask here because the undo code already seems to
try to account for these to some extent. eg there are a few of these
in the undo function:
(while (eq (car list) nil)
(setq list (cdr list)))
Is this an Emacs bug or an Evil bug?
^ permalink raw reply [flat|nested] 4+ messages in thread* bug#17236: undo-only hangs when nils double up 2014-04-10 16:15 bug#17236: undo-only hangs when nils double up Barry OReilly @ 2014-04-10 17:23 ` Andreas Schwab 2014-04-10 20:30 ` Stefan Monnier 1 sibling, 0 replies; 4+ messages in thread From: Andreas Schwab @ 2014-04-10 17:23 UTC (permalink / raw) To: Barry OReilly; +Cc: 17236 Barry OReilly <gundaetiapo@gmail.com> writes: > When there are consecutive nils in buffer-undo-list, undo-only can > hang. undo-boundary never creates such an entry. Andreas. -- Andreas Schwab, schwab@linux-m68k.org GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5 "And now for something completely different." ^ permalink raw reply [flat|nested] 4+ messages in thread
* bug#17236: undo-only hangs when nils double up 2014-04-10 16:15 bug#17236: undo-only hangs when nils double up Barry OReilly 2014-04-10 17:23 ` Andreas Schwab @ 2014-04-10 20:30 ` Stefan Monnier 2014-04-12 19:24 ` Barry OReilly 1 sibling, 1 reply; 4+ messages in thread From: Stefan Monnier @ 2014-04-10 20:30 UTC (permalink / raw) To: Barry OReilly; +Cc: 17236 > Is this an Emacs bug or an Evil bug? Putting a double nil in the undo-list is an error, so Evil is to blame. But that doesn't excuse the inf-loop. We should check with `eq' that we don't add an identity mapping to undo-equiv-table. Stefan ^ permalink raw reply [flat|nested] 4+ messages in thread
* bug#17236: undo-only hangs when nils double up 2014-04-10 20:30 ` Stefan Monnier @ 2014-04-12 19:24 ` Barry OReilly 0 siblings, 0 replies; 4+ messages in thread From: Barry OReilly @ 2014-04-12 19:24 UTC (permalink / raw) Cc: 17236-done [-- Attachment #1: Type: text/plain, Size: 54 bytes --] Rev 116951. The Evil bug was also reported and fixed. [-- Attachment #2: Type: text/html, Size: 114 bytes --] ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2014-04-12 19:24 UTC | newest] Thread overview: 4+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2014-04-10 16:15 bug#17236: undo-only hangs when nils double up Barry OReilly 2014-04-10 17:23 ` Andreas Schwab 2014-04-10 20:30 ` Stefan Monnier 2014-04-12 19:24 ` Barry OReilly
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