On Thu, Dec 01, 2016 at 12:58:21PM -0800, Junio C Hamano wrote:

> Jeff King <p...@peff.net> writes:
> > On Thu, Dec 01, 2016 at 12:52:05PM -0800, Junio C Hamano wrote:
> >
> >> Jeff King <p...@peff.net> writes:
> >> 
> >> > This takes the output of `diff-tree -z --raw` and feeds it
> >> > back to the later stages of the diff machinery to produce
> >> > diffs in other formats.
> >> 
> >> A full circle.  This reminds me of the experiment done more than 10
> >> years ago at the beginning of the "diffcore transformations" design.
> >
> > Heh, I didn't even think to dig for prior art on the list.
> It took me a while to dig it up because the topic is so old, but
> https://public-inbox.org/git/pine.lnx.4.58.0504251832480.18...@ppc970.osdl.org/
> is the thread I had in mind.  The idea of rename detection followed
> soon afterwards.

Thanks for an interesting read. Your diff-tree-helper patch is very
similar to what I wrote.

I do think the right decision was made back then. The single-process
model is much more efficient, and it was over 10 years until somebody
actually wanted to expose the functionality to a script (and even now,
I'm not convinced enough people want it to even merit inclusion).


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