remote.c: hoist branch.*.remote lookup out of remote_get_1

We'll want to use this logic as a fallback when looking up
the pushremote, so let's pull it out into its own function.

We don't technically need to make this available outside of
remote.c, but doing so will provide a consistent API with
pushremote_for_branch, which we will add later.
Signed-off-by: NJeff King <peff@peff.net>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

remote.c

@@ -692,6 +692,18 @@ static int valid_remote_nick(const char *name)
 	return !strchr(name, '/'); /* no slash */
 }
 
+const char *remote_for_branch(struct branch *branch, int *explicit)
+{
+	if (branch && branch->remote_name) {
+		if (explicit)
+			*explicit = 1;
+		return branch->remote_name;
+	}
+	if (explicit)
+		*explicit = 0;
+	return "origin";
+}
+
 static struct remote *remote_get_1(const char *name, const char *pushremote_name)
 {
 	struct remote *ret;
@@ -703,13 +715,8 @@ static struct remote *remote_get_1(const char *name, const char *pushremote_name
 		if (pushremote_name) {
 			name = pushremote_name;
 			name_given = 1;
-		} else {
-			if (current_branch && current_branch->remote_name) {
-				name = current_branch->remote_name;
-				name_given = 1;
-			} else
-				name = "origin";
-		}
+		} else
+			name = remote_for_branch(current_branch, &name_given);
 	}
 
 	ret = make_remote(name, 0);

remote.h

@@ -211,6 +211,7 @@ struct branch {
 };
 
 struct branch *branch_get(const char *name);
+const char *remote_for_branch(struct branch *branch, int *explicit);
 
 int branch_has_merge_config(struct branch *branch);
 int branch_merge_matches(struct branch *, int n, const char *);