* `after-change-functions' and undo
@ 2004-11-27 23:43 Paul Pogonyshev
2004-11-28 11:48 ` David Kastrup
0 siblings, 1 reply; 4+ messages in thread
From: Paul Pogonyshev @ 2004-11-27 23:43 UTC (permalink / raw)
Hi.
I'm having a problem with `after-change-functions' and undo
interference. My `after-change' hook does magic things to
allow special property inheritance. So, it can set certain
text properties on an inserted text chunk.
Everything works fine till I start undoing in the buffer.
It seems that `after-change' hook is invoked and, when
undoing a deletion, it sees an insertion and happily starts
mangling text properties.
So, the question is: can I prevent my `after-change' hook
from running while undo is in effect? I couldn't figure out
from the manual.
Paul
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: `after-change-functions' and undo
2004-11-27 23:43 `after-change-functions' and undo Paul Pogonyshev
@ 2004-11-28 11:48 ` David Kastrup
2004-11-28 14:51 ` Paul Pogonyshev
0 siblings, 1 reply; 4+ messages in thread
From: David Kastrup @ 2004-11-28 11:48 UTC (permalink / raw)
Cc: emacs-devel
Paul Pogonyshev <pogonyshev@gmx.net> writes:
> I'm having a problem with `after-change-functions' and undo
> interference.
>
> So, the question is: can I prevent my `after-change' hook
> from running while undo is in effect? I couldn't figure out
> from the manual.
undo-in-progress's value is nil
Non-nil while performing an undo.
Some change-hooks test this variable to do something different.
Defined in `simple'.
--
David Kastrup, Kriemhildstr. 15, 44793 Bochum
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: `after-change-functions' and undo
2004-11-28 11:48 ` David Kastrup
@ 2004-11-28 14:51 ` Paul Pogonyshev
2004-11-29 6:11 ` Richard Stallman
0 siblings, 1 reply; 4+ messages in thread
From: Paul Pogonyshev @ 2004-11-28 14:51 UTC (permalink / raw)
Cc: emacs-devel
David Kastrup wrote:
> Paul Pogonyshev <pogonyshev@gmx.net> writes:
> > I'm having a problem with `after-change-functions' and undo
> > interference.
> >
> > So, the question is: can I prevent my `after-change' hook
> > from running while undo is in effect? I couldn't figure out
> > from the manual.
>
> undo-in-progress's value is nil
>
> Non-nil while performing an undo.
> Some change-hooks test this variable to do something different.
>
> Defined in `simple'.
That's exactly what I was looking for, thank you.
Maybe it should be added to the Elisp manual? I can do this,
but I'm not sure where to add the description.
Paul
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: `after-change-functions' and undo
2004-11-28 14:51 ` Paul Pogonyshev
@ 2004-11-29 6:11 ` Richard Stallman
0 siblings, 0 replies; 4+ messages in thread
From: Richard Stallman @ 2004-11-29 6:11 UTC (permalink / raw)
Cc: emacs-devel
I will add this. Thanks.
*** text.texi 23 Oct 2004 00:52:51 -0400 1.79
--- text.texi 28 Nov 2004 19:53:10 -0500
***************
*** 1244,1249 ****
--- 1244,1255 ----
undo individual replacements one by one.
@end defun
+ @defvar undo-in-progress
+ This variable is normally @code{nil}, but the undo commands bind it to
+ @code{t}. This is so that various kinds of change hooks can tell when
+ they're being called for the sake of undoing.
+ @end defvar
+
@defun primitive-undo count list
This is the basic function for undoing elements of an undo list.
It undoes the first @var{count} elements of @var{list}, returning
^ permalink raw reply [flat|nested] 4+ messages in thread
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2004-11-27 23:43 `after-change-functions' and undo Paul Pogonyshev
2004-11-28 11:48 ` David Kastrup
2004-11-28 14:51 ` Paul Pogonyshev
2004-11-29 6:11 ` Richard Stallman
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