Re: git diff: add option for omitting the contents of deletes

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On Tue, Mar 8, 2011 at 9:49 PM, Junio C Hamano <gitster@xxxxxxxxx> wrote:
> Mart Sõmermaa <mrts.pydev@xxxxxxxxx> writes:
>
>> On Tue, Mar 1, 2011 at 2:11 AM, Junio C Hamano <gitster@xxxxxxxxx> wrote:
>>> In any case, a minimum patch to give what Mart wanted to see would
>>> probably look like this.  I'll leave bugfixes, documentation and tests to
>>> the readers ;-).
>>
>> The minimum looks to be the optimum -- IMHO this is entirely sufficient,
>
> I suspect not, as I don't think I ever did anything to the codepath for -B
> output, and I also recall spending some time thinking about this issue in
> an earlier message that I mentioned -B besides "deletion", none of the
> suggestions in which I don't think I tried to implement.

Your suggestion is as follows:

"It also might make sense to apply the similar principle to shorten the output
with -B when a rewrite patch is expressed as a single hunk patch that removes
everything old and then adds everthing new."

I have to admit that I've never used -B, only -M, so please don't mind that
its semantics and exact behavior are a bit foreign to me.

After running t/t4130-apply-criss-cross-rename.sh,
`git diff -M -B` outputs the following:

diff --git a/file2 b/file1
similarity index 100%
rename from file2
rename to file1
diff --git a/file1 b/file2
similarity index 100%
rename from file1
rename to file2

Can you bring a similar example of changes in the output after
the above-mentioned similar principle has been implemented for -B?

> I also vaguely recall that I suspected that the output may not have the
> usual "index deadbeaf..000000 mode" line and that I chose to ignore it.

'deadbeaf' is present:

$ ../git/bin-wrappers/git diff -D HEAD
diff --git a/foo.txt b/foo.txt
deleted file mode 100644
index 257cc56..0000000

Can we perhaps consider the -B behavior orthogonal to -D (unless I am missing
something very important here)?

Best regards,
MS
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