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, 5 insertions, 2 deletions

diff --git a/log-tree.c b/log-tree.c
index 8dba7be92e..1a0e170793 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -149,10 +149,13 @@ static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
 void load_ref_decorations(int flags)
 {
 	if (!decoration_loaded) {
+		struct each_ref_fn_sha1_adapter wrapped_add_ref_decoration =
+			{add_ref_decoration, NULL};
+
 		decoration_loaded = 1;
 		decoration_flags = flags;
-		for_each_ref(add_ref_decoration, NULL);
-		head_ref(add_ref_decoration, NULL);
+		for_each_ref(each_ref_fn_adapter, &wrapped_add_ref_decoration);
+		head_ref(each_ref_fn_adapter, &wrapped_add_ref_decoration);
 		for_each_commit_graft(add_graft_decoration, NULL);
 	}
 }