each_ref_fn: change to take an object_id parameter

Change typedef each_ref_fn to take a "const struct object_id *oid"
parameter instead of "const unsigned char *sha1".

To aid this transition, implement an adapter that can be used to wrap
old-style functions matching the old typedef, which is now called
"each_ref_sha1_fn"), and make such functions callable via the new
interface. This requires the old function and its cb_data to be
wrapped in a "struct each_ref_fn_sha1_adapter", and that object to be
used as the cb_data for an adapter function, each_ref_fn_adapter().

This is an enormous diff, but most of it consists of simple,
mechanical changes to the sites that call any of the "for_each_ref"
family of functions. Subsequent to this change, the call sites can be
rewritten one by one to use the new interface.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/walker.c b/walker.c
index 58ffeca264..bb2e0b9328 100644
--- a/walker.c
+++ b/walker.c
@@ -269,7 +269,10 @@ int walker_fetch(struct walker *walker, int targets, char **target,
 	}
 
 	if (!walker->get_recover) {
-		for_each_ref(mark_complete, NULL);
+		struct each_ref_fn_sha1_adapter wrapped_mark_complete =
+			{mark_complete, NULL};
+
+		for_each_ref(each_ref_fn_adapter, &wrapped_mark_complete);
 		commit_list_sort_by_date(&complete);
 	}