reachable: reuse revision.c "add all reflogs" code

We want to add all reflog entries as tips for finding
reachable objects. The revision machinery can already do
this (to support "rev-list --reflog"); we can reuse that
code.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

reachable.c

@@ -22,22 +22,6 @@ static void update_progress(struct connectivity_progress *cp)
 		display_progress(cp->progress, cp->count);
 }
 
-static int add_one_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
-		const char *email, unsigned long timestamp, int tz,
-		const char *message, void *cb_data)
-{
-	struct object *object;
-	struct rev_info *revs = (struct rev_info *)cb_data;
-
-	object = parse_object(osha1);
-	if (object)
-		add_pending_object(revs, object, "");
-	object = parse_object(nsha1);
-	if (object)
-		add_pending_object(revs, object, "");
-	return 0;
-}
-
 static int add_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
 {
 	struct object *object = parse_object_or_die(sha1, path);
@@ -48,12 +32,6 @@ static int add_one_ref(const char *path, const unsigned char *sha1, int flag, vo
 	return 0;
 }
 
-static int add_one_reflog(const char *path, const unsigned char *sha1, int flag, void *cb_data)
-{
-	for_each_reflog_ent(path, add_one_reflog_ent, cb_data);
-	return 0;
-}
-
 static void add_one_tree(const unsigned char *sha1, struct rev_info *revs)
 {
 	struct tree *tree = lookup_tree(sha1);
@@ -138,7 +116,7 @@ void mark_reachable_objects(struct rev_info *revs, int mark_reflog,
 
 	/* Add all reflog info */
 	if (mark_reflog)
-		for_each_reflog(add_one_reflog, revs);
+		add_reflogs_to_pending(revs, 0);
 
 	cp.progress = progress;
 	cp.count = 0;

revision.c

@@ -1275,7 +1275,7 @@ static int handle_one_reflog(const char *path, const unsigned char *sha1, int fl
 	return 0;
 }
 
-static void handle_reflog(struct rev_info *revs, unsigned flags)
+void add_reflogs_to_pending(struct rev_info *revs, unsigned flags)
 {
 	struct all_refs_cb cb;
 	cb.all_revs = revs;
@@ -2061,7 +2061,7 @@ static int handle_revision_pseudo_opt(const char *submodule,
 		for_each_glob_ref_in(handle_one_ref, arg + 10, "refs/remotes/", &cb);
 		clear_ref_exclusion(&revs->ref_excludes);
 	} else if (!strcmp(arg, "--reflog")) {
-		handle_reflog(revs, *flags);
+		add_reflogs_to_pending(revs, *flags);
 	} else if (!strcmp(arg, "--not")) {
 		*flags ^= UNINTERESTING | BOTTOM;
 	} else if (!strcmp(arg, "--no-walk")) {

revision.h

@@ -276,6 +276,7 @@ extern void add_pending_sha1(struct rev_info *revs,
 			     unsigned int flags);
 
 extern void add_head_to_pending(struct rev_info *);
+extern void add_reflogs_to_pending(struct rev_info *, unsigned int flags);
 
 enum commit_action {
 	commit_ignore,