GNU bug report logs - #1017
vc-diff for the hg backend ignore diff switches variables

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From: help-debbugs <at> gnu.org (Emacs bug Tracking System)
To: Francesco Potorti` <pot <at> gnu.org>
Subject: bug#1017 closed by Glenn Morris <rgm <at> gnu.org> (Re: bug#1017: 
 vc-diff for the hg backend ignore diff switches variables)

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This is an automatic notification regarding your bug report
which was filed against the emacs package:

#1017: vc-diff for the hg backend ignore diff switches variables

It has been closed by Glenn Morris <rgm <at> gnu.org>.

Their explanation is attached below along with your original report.
If this explanation is unsatisfactory and you have not received a
better one in a separate message then please contact Glenn Morris <rgm <at> gnu.org> by
replying to this email.


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1017: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=1017
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From: Glenn Morris <rgm <at> gnu.org>
To: 1017-done <at> debbugs.gnu.org
Subject: Re: bug#1017: vc-diff for the hg backend ignore diff switches variables
Date: Wed, 19 Nov 2008 21:45:49 -0500

It seems no-one uses Mercurial, so I verified myself that this seems
to work OK, and have installed it.

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From: Francesco Potorti` <pot <at> gnu.org>
To: GNU emacs bug list <bug-gnu-emacs <at> gnu.org>
Subject: vc-diff for the hg backend ignore diff switches variables
Date: Tue, 23 Sep 2008 16:57:24 +0200

Three related problems:

1)
Apparently the hg backend of vc ignores both diff-switches and
vc-diff-switches.

2)
The vc-hg-diff-switches variables is not defined.

3)
The hg backend is special with respect to the vc-diff-switches
variable.  Its doc says:

  A string or list of strings specifying switches for diff under VC.
  When running diff under a given BACKEND, VC concatenates the values of
  `diff-switches', `vc-diff-switches', and `vc-BACKEND-diff-switches' to
  get the switches for that command.  Thus, `vc-diff-switches' should
  contain switches that are specific to version control, but not
  specific to any particular backend.

This behaviour assumes that the diff switches can be accumulated.
however, it does not allow for removing them for a particular backend.
For example, I have

(setq diff-switches "-pu"
      vc-diff-switches "-b")

which works for the cvs and rcs backends.  However, it would not work
for the hg backend, as 'hg diff' does not tolerate the -u option.  This
problem would require a different way of combining the diff switches.

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