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, 7 insertions, 2 deletions

diff --git a/http-backend.c b/http-backend.c
index b6c0484fb2..e4f3de3b7e 100644
--- a/http-backend.c
+++ b/http-backend.c
@@ -395,8 +395,11 @@ static void get_info_refs(char *arg)
 		run_service(argv);
 
 	} else {
+		struct each_ref_fn_sha1_adapter wrapped_show_text_ref =
+			{show_text_ref, &buf};
+
 		select_getanyfile();
-		for_each_namespaced_ref(show_text_ref, &buf);
+		for_each_namespaced_ref(each_ref_fn_adapter, &wrapped_show_text_ref);
 		send_strbuf("text/plain", &buf);
 	}
 	strbuf_release(&buf);
@@ -425,9 +428,11 @@ static int show_head_ref(const char *refname, const unsigned char *sha1,
 static void get_head(char *arg)
 {
 	struct strbuf buf = STRBUF_INIT;
+	struct each_ref_fn_sha1_adapter wrapped_show_head_ref =
+		{show_head_ref, &buf};
 
 	select_getanyfile();
-	head_ref_namespaced(show_head_ref, &buf);
+	head_ref_namespaced(each_ref_fn_adapter, &wrapped_show_head_ref);
 	send_strbuf("text/plain", &buf);
 	strbuf_release(&buf);
 }