GNU bug report logs - #871
23.0.60; diff mode inverted logic

Message received at (unknown):

Received: (at unknown) by unknown; unknown
X-Spam-Checker-Version: SpamAssassin 3.2.3-bugs.debian.org_2005_01_02
	(2007-08-08) on rzlab.ucr.edu
X-Spam-Level: 
X-Spam-Status: No, score=-7.9 required=4.0 tests=BAYES_00,FOURLA,
	MURPHY_DRUGS_REL8,RCVD_IN_DNSWL_MED autolearn=ham
	version=3.2.3-bugs.debian.org_2005_01_02
Received: (at submit) by emacsbugs.donarmstrong.com; 3 Sep 2008 13:30:49 +0000
Received: from fencepost.gnu.org (fencepost.gnu.org [140.186.70.10])
	by rzlab.ucr.edu (8.13.8/8.13.8/Debian-3) with ESMTP id m83DUikL019633
	for <submit@HIDDEN>; Wed, 3 Sep 2008 06:30:45 -0700
Received: from mx10.gnu.org ([199.232.76.166]:52916)
	by fencepost.gnu.org with esmtp (Exim 4.67)
	(envelope-from <dave@HIDDEN>)
	id 1KasPx-0001Z9-Nn
	for emacs-pretest-bug@HIDDEN; Wed, 03 Sep 2008 09:29:05 -0400
Received: from Debian-exim by monty-python.gnu.org with spam-scanned (Exim 4.60)
	(envelope-from <dave@HIDDEN>)
	id 1KasRT-0005YL-NP
	for emacs-pretest-bug@HIDDEN; Wed, 03 Sep 2008 09:30:44 -0400
Received: from boost-consulting.com ([206.71.190.141]:61856)
	by monty-python.gnu.org with esmtp (Exim 4.60)
	(envelope-from <dave@HIDDEN>)
	id 1KasRT-0005Y3-6S
	for emacs-pretest-bug@HIDDEN; Wed, 03 Sep 2008 09:30:39 -0400
Received: from mcbain.luannocracy.com.boostpro.com (207-172-223-249.c3-0.smr-ubr3.sbo-smr.ma.static.cable.rcn.com [207.172.223.249])
	(Authenticated sender: dave)
	by boost-consulting.com (Postfix) with ESMTPSA id 319D61CC1E;
	Wed,  3 Sep 2008 06:24:23 -0700 (PDT)
From: David Abrahams <dave@HIDDEN>
To: emacs-pretest-bug@HIDDEN
Subject: 23.0.60; diff mode inverted logic
Date: Wed, 03 Sep 2008 09:30:34 -0400
Message-ID: <8763pdcq6d.fsf@HIDDEN>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-detected-kernel: by monty-python.gnu.org: FreeBSD 6.x (1)


Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the emacs-pretest-bug@HIDDEN mailing list.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

    diff -dur directory1 directory2 > changes.diff
    `C-x C-f changes.diff'
    `C-x C-q' ;; to make the buffer read-only, if it isn't already
    `N'
    `C-c C-a'

The diff described above generates a patch that can be used to transform
directory1 so that it is identical to directory2.  However, using
diff-mode with default settings to actually perform that transformation
is unaccountably awkward.  First of all, if you use diff mode in the
most obvious way, it wants to modify directory2 instead of directory1.
The only way I know of to get it to operate on directory1 instead is to
invert the direction of the diffs with `C-c C-r'.  But then every time I
apply a diff, I am told that it has already been applied and asked if I
want to undo it.  I can say yes and get the behavior I want, but as I
noted, it's awkward at best.  Hmm, I just discovered
diff-jump-to-old-file, which defaults to nil, and corrects this problem!
What use case is made easier by its default setting?

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/local/share/emacs/23.0.60/etc/DEBUG for instructions.


In GNU Emacs 23.0.60.2 (i686-pc-linux-gnu, GTK+ Version 2.12.9)
 of 2008-05-03 on mcbain
Windowing system distributor `The X.Org Foundation', version 11.0.10400090
configured using `configure  '--with-x-toolkit=gtk' '--prefix=/usr/local''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Diff

Minor modes in effect:
  shell-dirtrack-mode: t
  show-paren-mode: t
  global-auto-revert-mode: t
  delete-selection-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-n C-n C-n C-n C-n C-n C-n C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-p M-< M-! M-p C-. 
C-. C-. C-. C-. C-. C-. C-, <M-backspace> <backspace> 
<return> C-S-x C-S-w M-P M-P M-P M-P <return> Y Y C-S-x 
B B O O <tab> C-S-g C-S-x C-S-k M-< C-_ C-_ C-S-x C-S-v 
<return> Y E S <return> y e s <return> n C-_ C-x C-q 
n C-c C-r <return> C-x C-f C-g C-x C-n C-c C-a y C-h 
m C-x C-p C-s b u g C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-s C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-p C-p C-p C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-x C-k C-x C-n M-x e m a c 
s - b u <tab> <backspace> <backspace> <backspace> <tab> 
<tab> C-g C-g C-h a b u g <return> C-x C-p C-s r e 
p o r t C-s C-s C-s C-s C-s C-s C-s C-s C-s C-s C-s 
C-x C-k C-x C-n M-x r e p o <tab> r t <tab> b u <tab> 
<return>

Recent messages:
Mark set
Hunk has already been applied; undo it? (y or n) 
Hunk undone
Type C-x 4 C-o RET to restore the other window, C-M-v to scroll help.
Mark saved where search started
Making completion list...
Quit [2 times]
Type C-x 4 C-o RET to restore the other window.  
Mark saved where search started
Making completion list...

-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com