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/sha1_name.c b/sha1_name.c
index 6d10f052b5..1aad0a3223 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -1371,7 +1371,10 @@ static int get_sha1_with_context_1(const char *name,
 		int pos;
 		if (!only_to_die && namelen > 2 && name[1] == '/') {
 			struct commit_list *list = NULL;
-			for_each_ref(handle_one_ref, &list);
+			struct each_ref_fn_sha1_adapter wrapped_handle_one_ref =
+				{handle_one_ref, &list};
+
+			for_each_ref(each_ref_fn_adapter, &wrapped_handle_one_ref);
 			commit_list_sort_by_date(&list);
 			return get_sha1_oneline(name + 2, sha1, list);
 		}