From: npostavs@users.sourceforge.net
To: Eli Zaretskii <eliz@gnu.org>
Cc: lekktu@gmail.com, monnier@iro.umontreal.ca, dgutov@yandex.ru,
rost@math.uni-bielefeld.de, 4655@debbugs.gnu.org, larsi@gnus.org
Subject: bug#4655: 23.1.50; buffer-swap-text oddity
Date: Wed, 13 Jul 2016 19:50:49 -0400 [thread overview]
Message-ID: <87a8hlf67a.fsf@users.sourceforge.net> (raw)
In-Reply-To: <83zipnbflj.fsf@gnu.org> (Eli Zaretskii's message of "Tue, 12 Jul 2016 08:16:56 +0300")
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Eli Zaretskii <eliz@gnu.org> writes:
> Yes, something like "upon return from this form ...". I think it's a
> good idea.
>
> Otherwise the text is good, IMO.
Okay, here is my final version, I will push tomorrow.
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[-- Attachment #2: patch-v3 --]
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From f0295dbfceb3264f93d583537ff184b63779adea Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs@gmail.com>
Date: Sun, 10 Jul 2016 21:52:23 -0400
Subject: [PATCH v3] Document buffer-swap-text+save-excursion interaction
* doc/lispref/buffers.texi (Swapping Text):
* src/buffer.c (Fbuffer_swap_text): Add warning about interaction of
`buffer-swap-text' and `save-excursion' (Bug #4655).
---
doc/lispref/buffers.texi | 6 ++++++
src/buffer.c | 4 +++-
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/doc/lispref/buffers.texi b/doc/lispref/buffers.texi
index 1f7f263..740d7cf 100644
--- a/doc/lispref/buffers.texi
+++ b/doc/lispref/buffers.texi
@@ -1211,6 +1211,12 @@ Swapping Text
overlays, the text properties, the undo list, the value of the
@code{enable-multibyte-characters} flag (@pxref{Text Representations,
enable-multibyte-characters}), etc.
+
+@strong{Warning:} If this function is called from within a
+@code{save-excursion} form, the current buffer will be set to
+@var{buffer} upon leaving the form, since the marker used by
+@code{save-excursion} to save the position and buffer will be swapped
+as well.
@end defun
If you use @code{buffer-swap-text} on a file-visiting buffer, you
diff --git a/src/buffer.c b/src/buffer.c
index e4269c0..89f4479 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -2231,7 +2231,9 @@ advance_to_char_boundary (ptrdiff_t byte_pos)
DEFUN ("buffer-swap-text", Fbuffer_swap_text, Sbuffer_swap_text,
1, 1, 0,
- doc: /* Swap the text between current buffer and BUFFER. */)
+ doc: /* Swap the text between current buffer and BUFFER.
+Using this function from `save-excursion' might produce surprising
+results, see Info node `(elisp)Swapping Text'. */)
(Lisp_Object buffer)
{
struct buffer *other_buffer;
--
2.8.0
next prev parent reply other threads:[~2016-07-13 23:50 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <jwv3a2eiia3.fsf-monnier+emacs@gnu.org>
2009-10-06 18:46 ` bug#4655: 23.1.50; buffer-swap-text oddity Markus Rost
2009-10-07 4:01 ` Juanma Barranquero
2009-10-07 5:41 ` Stefan Monnier
2009-10-07 8:53 ` Markus Rost
2009-10-07 10:07 ` Juanma Barranquero
2009-10-07 14:29 ` Stefan Monnier
2009-10-08 16:48 ` Markus Rost
2011-07-13 14:08 ` Lars Magne Ingebrigtsen
2016-07-11 1:58 ` npostavs
2016-07-11 14:37 ` Eli Zaretskii
2016-07-11 18:50 ` Markus Rost
2016-07-11 19:07 ` Dmitry Gutov
2016-07-12 1:58 ` npostavs
2016-07-12 5:16 ` Eli Zaretskii
2016-07-13 23:50 ` npostavs [this message]
2016-07-14 15:03 ` Eli Zaretskii
2016-07-15 0:05 ` npostavs
2010-01-10 7:36 ` bug#5273: marked as done (23.1; format-alist encode vs write-region-post-annotation-function) Emacs bug Tracking System
2010-01-13 0:45 ` bug#5256: marked as done (conjunct formation should follow input sequence when inserting text) Emacs bug Tracking System
2010-01-13 0:49 ` bug#5265: marked as done (23.1.90; vc - can't reread redirected stdin for log message) Emacs bug Tracking System
2010-01-14 1:22 ` bug#5276: marked as done (23.1; Doc string of bookmark-bmenu-execute-deletions) Emacs bug Tracking System
2010-01-16 20:05 ` bug#5267: 23.1; doc string of defstruct Chong Yidong
2010-01-16 21:39 ` bug#5279: 23.1; VC: should set LC_MESSAGES to C (with patch) Chong Yidong
2010-05-13 19:20 ` bug#5284: 23.1; gnus-summary-expire-thread does not work Glenn Morris
2010-05-24 19:53 ` bug#5270: [PATCH] * lisp/image-dired.el (image-dired-dired-insert-marked-thumbs) Insert thumbnails before file names of marked files in the dired buffer Thierry Volpiatto
2010-05-25 15:49 ` Juri Linkov
2010-05-25 16:59 ` Thierry Volpiatto
2010-05-25 17:46 ` Juri Linkov
2010-06-30 20:35 ` bug#5281: 23.1; xml-parse-region causes infinite loops if the region is not well-formed XML Chong Yidong
2009-12-29 18:19 bug#5284: 23.1; gnus-summary-expire-thread does not work Tom Tromey
2010-05-11 6:04 ` Andreas Seltenreich
[not found] ` <mailman.7.1273778942.8369.bug-gnu-emacs@gnu.org>
2010-06-30 21:35 ` Ted Zlatanov
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