* bug#12254: 24.2; completion fails backward-char
@ 2012-08-22 2:40 Leo
2012-08-22 16:17 ` Stefan Monnier
2012-08-29 18:05 ` Stefan Monnier
0 siblings, 2 replies; 6+ messages in thread
From: Leo @ 2012-08-22 2:40 UTC (permalink / raw)
To: 12254
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This is a regression. It doesn't happen in Emacs 23.4.
1. Emacs -q -l b.el (b.el is attached)
2. M-x b-mode
3. Type I followed by <tab> to complete to IGNORE
4. C-b
In step 4, C-b could not move backwards; point appears to be trapped
there.
Leo
[-- Attachment #2: b.el --]
[-- Type: application/emacs-lisp, Size: 401 bytes --]
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#12254: 24.2; completion fails backward-char
2012-08-22 2:40 bug#12254: 24.2; completion fails backward-char Leo
@ 2012-08-22 16:17 ` Stefan Monnier
2012-08-29 18:05 ` Stefan Monnier
1 sibling, 0 replies; 6+ messages in thread
From: Stefan Monnier @ 2012-08-22 16:17 UTC (permalink / raw)
To: Leo; +Cc: 12254
Thanks for those bug reports, Leo.
I'm probably to blame for most/all of those completion problems, but I'm
just coming back from a vacation and have to prepare for the "beginning
of the end of the semester" (for reasons of student strikes (tho
I guess it's probably more due to government's obtuseness), we're about
to resume classes for the last 4 weeks of the winter semester ;-).
So, I'll try to look at it ASAP, but you may have to wait a week or two.
Stefan
^ permalink raw reply [flat|nested] 6+ messages in thread* bug#12254: 24.2; completion fails backward-char
2012-08-22 2:40 bug#12254: 24.2; completion fails backward-char Leo
2012-08-22 16:17 ` Stefan Monnier
@ 2012-08-29 18:05 ` Stefan Monnier
2012-08-30 12:05 ` Leo
1 sibling, 1 reply; 6+ messages in thread
From: Stefan Monnier @ 2012-08-29 18:05 UTC (permalink / raw)
To: Leo; +Cc: 12254-done
tags 12254 notabug
thanks
> (defun b-completion-at-point ()
> (let ((beg (progn
> (skip-syntax-backward "w")
> (point)))
> (end (progn
> (skip-syntax-forward "w")
> (point))))
> (list beg end '("IGNORE" "DEBUG" "HELLO"))))
This needs to save-excursion.
> This is a regression. It doesn't happen in Emacs 23.4.
That's only because completion-at-point-functions is used less often so
the bug in the above code doesn't bite as often.
But your above completion function is already buggy in Emacs-23.4 since
it can't complete "IG!R" to "IGNORE", whereas after adding the
save-excursion such completion works just fine.
Stefan
^ permalink raw reply [flat|nested] 6+ messages in thread* bug#12254: 24.2; completion fails backward-char
2012-08-29 18:05 ` Stefan Monnier
@ 2012-08-30 12:05 ` Leo
2012-08-30 15:39 ` Stefan Monnier
0 siblings, 1 reply; 6+ messages in thread
From: Leo @ 2012-08-30 12:05 UTC (permalink / raw)
To: Stefan Monnier; +Cc: 12254
On 2012-08-30 02:05 +0800, Stefan Monnier wrote:
> That's only because completion-at-point-functions is used less often so
> the bug in the above code doesn't bite as often.
> But your above completion function is already buggy in Emacs-23.4 since
> it can't complete "IG!R" to "IGNORE", whereas after adding the
> save-excursion such completion works just fine.
Thank you for this.
This isn't clear on the documentation on completion-at-point-functions.
It is a trap that one can easily fall into. I wonder if you may add a
note in the doc-string of completion-at-point-functions. Thanks.
Leo
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#12254: 24.2; completion fails backward-char
2012-08-30 12:05 ` Leo
@ 2012-08-30 15:39 ` Stefan Monnier
2012-08-30 22:25 ` Leo
0 siblings, 1 reply; 6+ messages in thread
From: Stefan Monnier @ 2012-08-30 15:39 UTC (permalink / raw)
To: Leo; +Cc: 12254
> This isn't clear on the documentation on completion-at-point-functions.
> It is a trap that one can easily fall into. I wonder if you may add a
> note in the doc-string of completion-at-point-functions. Thanks.
How 'bout the patch below?
Stefan
=== modified file 'lisp/minibuffer.el'
--- lisp/minibuffer.el 2012-08-14 17:10:38 +0000
+++ lisp/minibuffer.el 2012-08-30 15:39:14 +0000
@@ -1821,7 +1821,9 @@
`:predicate' a predicate that completion candidates need to satisfy.
`:exclusive' If `no', means that if the completion table fails to
match the text at point, then instead of reporting a completion
- failure, the completion should try the next completion function.")
+ failure, the completion should try the next completion function.
+As is the case with most hooks, the functions are responsible to preserve
+things like point and current buffer.")
(defvar completion--capf-misbehave-funs nil
"List of functions found on `completion-at-point-functions' that misbehave.
^ permalink raw reply [flat|nested] 6+ messages in thread* bug#12254: 24.2; completion fails backward-char
2012-08-30 15:39 ` Stefan Monnier
@ 2012-08-30 22:25 ` Leo
0 siblings, 0 replies; 6+ messages in thread
From: Leo @ 2012-08-30 22:25 UTC (permalink / raw)
To: Stefan Monnier; +Cc: 12254
On 2012-08-30 23:39 +0800, Stefan Monnier wrote:
> === modified file 'lisp/minibuffer.el'
> --- lisp/minibuffer.el 2012-08-14 17:10:38 +0000
> +++ lisp/minibuffer.el 2012-08-30 15:39:14 +0000
> @@ -1821,7 +1821,9 @@
> `:predicate' a predicate that completion candidates need to satisfy.
> `:exclusive' If `no', means that if the completion table fails to
> match the text at point, then instead of reporting a completion
> - failure, the completion should try the next completion function.")
> + failure, the completion should try the next completion function.
> +As is the case with most hooks, the functions are responsible to preserve
> +things like point and current buffer.")
>
> (defvar completion--capf-misbehave-funs nil
> "List of functions found on `completion-at-point-functions' that misbehave.
Thank you. That looks good ;)
Leo
^ permalink raw reply [flat|nested] 6+ messages in thread
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2012-08-22 2:40 bug#12254: 24.2; completion fails backward-char Leo
2012-08-22 16:17 ` Stefan Monnier
2012-08-29 18:05 ` Stefan Monnier
2012-08-30 12:05 ` Leo
2012-08-30 15:39 ` Stefan Monnier
2012-08-30 22:25 ` Leo
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