On Wed, Jan 18, 2017 at 12:57:12PM -0800, Junio C Hamano wrote:
> Jeff King <peff@xxxxxxxx> writes:
>
> > So I dunno. A sensible rule to me is "iff -p would show a diff header,
> > then --stat should mention it".
>
> True but tricky (you need a better definition of "a diff header").
>
> In addition to a new and deleted file, does a file whose executable
> bit was flipped need mention? If so, then "diff --git" is the diff
> header in the above. Otherwise "@@ ... @@", iow, "iff -p would show
> any hunk".
>
> I think the patch implements the latter, which I think is sensible.
I would think the former is more sensible (and is what my patch is
working towards). Doing:
>empty
git add empty
git diff --cached
shows a "diff --git" header, but no hunk. I think it should show a
diffstat (and does with my patch).
I was thinking the rule should be something like:
if (p->status == DIFF_STATUS_MODIFIED &&
!file->added && !file->deleted))
and otherwise include the entry, since it would be an add, delete,
rename, etc, which carries useful information.
Though a pure rename would not hit this code path at all, I would think
(it would not trigger "!same_contents"). And a rename where there was a
whitespace only change probably _should_ be omitted from "-b".
Ditto for a pure mode change, I think. We do not run the contents
through diff at all, so it does not hit this code path.
-Peff