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25.0.50; Use unified diff format by default, and recommend using it in reports and patches |
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Thu, 09 Apr 2015 23:05:42 +0300 |
That should involve changing the default `diff-switches' value and small
changes to doc/emacs/files.texi and doc/emacs/trouble.texi.
Let me know if I missed something.
Barring any objections, I'll do that tomorrow-ish, on master.
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Re: bug#20290: 25.0.50; Use unified diff format by default, and recommend using it in reports and patches |
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Tue, 14 Apr 2015 05:16:28 +0300 |
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Mozilla/5.0 (X11; Linux x86_64; rv:36.0) Gecko/20100101 Thunderbird/36.0 |
On 04/13/2015 02:30 AM, Paul Eggert wrote:
As I recall, RMS preferred diff -c to diff -u, and that is partly why
trouble.texi suggests -c over -u and why diff-switches defaults to -c.
Yup, Stephen reminded of that in a recent emacs-devel thread, so I
thought this would be a good time to try to change it.
These days -u format is far more popular than -c format in practice, and
I expect that most active Emacs developers prefer -u, so it's
appropriate for Emacs to default to -u and for trouble.texi to suggest it.
This is done now. Thanks everyone.
I suppose that in theory there is the issue of Emacs running on an older
POSIXish platform where 'diff' does not support -u. I don't have access
to any such platform, though. I can confirm that Solaris 10 diff (2005)
supports '-u'. So perhaps we don't need to worry about this.
I think the usual response is that users on outdated systems don't
necessarily have to be able to use the latest-and-greatest Emacs.
But in this case the incompatibility would be very minor: if someone
actually encounters this problem, they'll only need to customize the
relevant variable.
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