bisect: move common bisect functionality to "bisect_common"

So we can easily reuse the code in a later patch.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

bisect.c

@@ -532,6 +532,20 @@ static void bisect_rev_setup(struct rev_info *revs, const char *prefix)
 	revs->limited = 1;
 }
 
+static void bisect_common(struct rev_info *revs, const char *prefix,
+			  int *reaches, int *all)
+{
+	bisect_rev_setup(revs, prefix);
+
+	if (prepare_revision_walk(revs))
+		die("revision walk setup failed");
+	if (revs->tree_objects)
+		mark_edges_uninteresting(revs->commits, revs, NULL);
+
+	revs->commits = find_bisection(revs->commits, reaches, all,
+				       !!skipped_sha1_nr);
+}
+
 int bisect_next_vars(const char *prefix)
 {
 	struct rev_info revs;
@@ -542,15 +556,7 @@ int bisect_next_vars(const char *prefix)
 	info.revs = &revs;
 	info.bisect_show_flags = BISECT_SHOW_TRIED | BISECT_SHOW_STRINGED;
 
-	bisect_rev_setup(&revs, prefix);
-
-	if (prepare_revision_walk(&revs))
-		die("revision walk setup failed");
-	if (revs.tree_objects)
-		mark_edges_uninteresting(revs.commits, &revs, NULL);
-
-	revs.commits = find_bisection(revs.commits, &reaches, &all,
-				      !!skipped_sha1_nr);
+	bisect_common(&revs, prefix, &reaches, &all);
 
 	return show_bisect_vars(&info, reaches, all);
 }