Re: [PATCH 11/11] refs: split and make get_*_ref_store() public API

Duy Nguyen [off-list ref] writes:

Direct call sites are just middle men though, e.g.
for_each_ref_submodule(). I'll attempt to clean this up at some point
in future (probably at the same time I attempt to kill *_submodule ref
api). But I think for now I'll just put a TODO or FIXME comment here.

So we'd have get_*_ref_store() for various cases and then will have
a unifying for_each_ref_in_refstore() that takes a ref-store, which
supersedes all the ad-hoc iterators like for_each_ref_submodule(),
for_each_namespaced_ref(), etc?

That's a very sensible longer-term goal, methinks.

I am wondering what we should do to for_each_{tag,branch,...}_ref().  
Would that become

	ref_store = get_ref_main_store();
	tag_ref_store = filter_ref_store(ref_store, "refs/tags/");
	for_each_ref_in_refstore(tag_ref_store, ...);

or do you plan to have some other pattern?