Re: [RFC 2/2] grep: use '/' delimiter for paths

[Junio C Hamano <gitster@pobox.com>]

Stefan Hajnoczi <stefanha@redhat.com> writes:

> If the tree contains a sub-directory then git-grep(1) output contains a
> colon character instead of a path separator:
>
>   $ git grep malloc v2.9.3:t
>   v2.9.3:t:test-lib.sh:	setup_malloc_check () {
>   $ git show v2.9.3:t:test-lib.sh
>   fatal: Path 't:test-lib.sh' does not exist in 'v2.9.3'

I am slightly less negative on this compared to 1/2, but not by a
big margin.  The user wanted to feed a subtree to the command,
instead of doing the more natural

    $ git grep -e malloc v2.9.3 -- t

So again, "contains a colon character" is not coming from what Git
does, but the user gave Git "a colon character" when she didn't have
to.

Having said that, if we wanted to start ignoring what the end-user
said in the initial input like 1/2 and 2/2 does (i.e. "this specific
tree object" as an input), I think the approach to solve for 1/2 and
2/2 should be the same.  I think we should decide to do a slash
instead of a colon, not because v2.9.3: has colon at the end and
v2.9.3:t has colon in it, but because both of these are both bare
tree objects.  The patches presented does not seem to base their
decision on the actual object type but on the textual input, which
seems wrong.