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bug#11067:; diff-buffer-with-file

From: Arni Magnusson
Subject: bug#11067:; diff-buffer-with-file
Date: Thu, 22 Mar 2012 14:54:16 +0000 (UTC)
User-agent: Alpine 2.02 (LFD 1266 2009-07-14)

I'm running Emacs alpha,


and `diff-buffer-with-file' is not working like it did in Emacs 23.4.1

1. Start emacs -Q
2. Set `diff-command' to "winmerge" and `diff-switches' to nil
3. Open a file, say c:/gnu/emacs/BUGS, make some changes without saving
4. M-x diff-buffer-with-file

Emacs 23.4.1 performs this task very nicely, but Emacs alpha provides the external program with args that cannot be compared:


Examining the Emacs *Diff* buffer provides some insights. In Emacs 23.4.1 it contains

  winmerge "c:/gnu/emacs/BUGS" "c:/Temp/buffer-content-3436L7C"

which looks sensible, but in Emacs alpha it the *Diff* buffer contains

winmerge "-L" "c:/gnu/emacs/BUGS" "-L" "#<buffer BUGS>" "c:/gnu/emacs/BUGS" "c:/Temp/buffer-content-2640boz"

which looks like 6 args instead of 2, including some "-L" options (even after specifically disabling all diff switches) and "#<buffer BUGS>" (probably of no use to an external program).

To me, it looks like version of `diff-buffer-with-file' in diff.el should try harder to mimic the behavior of version 23.4.1 in files.el.

Many thanks,


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