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/builtin/receive-pack.c b/builtin/receive-pack.c
index d2ec52bca9..12ecacddb4 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -228,10 +228,13 @@ static void collect_one_alternate_ref(const struct ref *ref, void *data)
 static void write_head_info(void)
 {
 	struct sha1_array sa = SHA1_ARRAY_INIT;
+	struct each_ref_fn_sha1_adapter wrapped_show_ref_cb =
+		{show_ref_cb, NULL};
+
 	for_each_alternate_ref(collect_one_alternate_ref, &sa);
 	sha1_array_for_each_unique(&sa, show_one_alternate_sha1, NULL);
 	sha1_array_clear(&sa);
-	for_each_ref(show_ref_cb, NULL);
+	for_each_ref(each_ref_fn_adapter, &wrapped_show_ref_cb);
 	if (!sent_capabilities)
 		show_ref("capabilities^{}", null_sha1);