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Re: [PATCH/RFC] Makefile: dedup list of files obtained from ls-files

On Mon, Apr 22, 2019 at 10:49:27AM -0400, Jeff King wrote:
> On Sun, Apr 21, 2019 at 10:19:04PM +0900, Junio C Hamano wrote:
> >    I am not fan of adding the "| sort -u" of the whole thing,
> >    because there is no need to dedup the output of the $(FIND) side
> >    of the alternative, but "(ls-files | sort -u) || (find)" would
> >    obviously not work.  If we truly care, perhaps we should add a
> >    new option to ls-files to show each path only once, unless it is
> >    showing the stage number (i.e. "ls-files -s" or "ls-files -u"),
> >    but this gets the problem go away without code change, hence this
> >    RFC ;-)
> FWIW, after reading your commit message my thoughts immediately turned
> to "why can't ls-files have a mode that outputs each just once", but
> then ended up at the same place as your patch: it's not that hard to
> just de-dup the output.
> It _could_ be a sign that other scripts besides our Makefile would
> benefit from such an option, but I think I'd want to see at least one
> other example before going in that direction.

I remember being rather puzzled by 'git ls-files' listing the same
file more than once depending on its --options when I was working on
the git-aware path completion parts of our completion script.