Re: [RFC diff-tree -c with copy/rename]

[Junio C Hamano <junkio@cox.net>]

"Marco Costalba" <mcostalba@gmail.com> writes:

> As example
>
> 'R093MM	checkout-index.c builtin-checkout-index.c'
>
> instead of current
>
> 'RM	builtin-checkout-index.c'

I am not particularly opposed to have an option to do this.  I
originally did not show this because I did not particularly find
it interesting (and I still don't).  The output would become a
very long line, not for human consumption, though.

But it should not be too involved if you want to do this.  We
already compute all the information necessary to do so before
combine-diff.c::intersect_paths() converts the usual <from,to>
representation (struct diff_filepair) into <result, list of
parents' blobs> representation (struct combine_diff_path), which
is used by combine-diff.c routines.

We currently do not retain that information when this conversion
happens to be used for the output.  You would need to add a few
fields to record the preimage filename, similarity score and
status in struct combine_diff_parent and populate them in
intersect_paths() and adjust the output routines.