diff has options to deal with whitespace.
-b --ignore-space-change
-w --ignore-all-space

Tim Daly

On Tue, 2011-10-25 at 07:35 +0200, Florent Hivert wrote:
> On Mon, Oct 24, 2011 at 11:20:47AM -0700, Keshav Kini wrote:
> > Hmm. I have to say I'm surprised that people are advocating for using 
> > trailing whitespace at all, as it seemed to me to be quite universally 
> > reviled in the programming world. But on some reflection, the only real 
> > problem with trailing whitespace - other than that it bloats files and that 
> > it, er, grates on certain types of minds :) - is that people remove it 
> > from, 
> > or, though I imagine this is rare, add it to otherwise untouched lines. I 
> > guess if hypothetically we had stuck to a "no trailing whitespace policy" 
> > from day 1 of Sage development, such a policy would have minimized diff 
> > cruft. But Sage's codebase is already so big that perhaps the best policy 
> > is 
> > just "don't purposelessly add or remove whitespace to lines that you aren't 
> > otherwise editing". As far as that goes, Jason's .emacs snippet seems 
> > useful 
> > for the developer's guide, indeed.
> 
> +1 to this policy ! WE are trying to do that in the sage-combinat project.
> 
> Systematically remove all trailing whitespaces creates a lot of conflicts in
> the patch queue so I'm strongly against it.
> 
> Cheers,
> 
> Florent
> 


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