Re: [PATCH v2 3/4] show-ref: Optimize show_ref a bit

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

Junio C Hamano <gitster@pobox.com> writes:

> Having to do this change probably is an indication that the division
> of labour between show_ref() and show_one() up to this step needs to
> be rethought.
>
> Conceptually, "git show-ref" works in two ways:
>
>  * When in --verify mode, the end user gives which refnames to
>    consider showing.
>
>  * Otherwise the end user gives pattern and the command infers which
>    refnames to consider showing using the pattern.
>
> And for the refnames that are considered for showing, we may do
> various things, like -d to deref and --quiet to be silent.  We want
> this actual "output" step to be the same between two modes of
> operation.

... also "error out if the named object did not exist" can be part
of this, which means ...

> So a better division of labour would be:
>
>  * Make show_ref() about "using pattern, enumerate what refs to
>    show" and call show_one().
>
>  * Update show_one() and teach _it_ to handle quiet and deref_tags.

... "if (!has_sha1_file(oid->hash)) die()" in show_ref() would
probably want to be part of this update.