git-commit-tree: make it usable from other builtins

diff --git a/commit.h b/commit.h
index dcec7fb9a2264d068037aa57894ba0a3ae43231a..2acfc79d3483b4c83c1c181a8ac1505393e96ee5 100644 (file)
--- a/commit.h
+++ b/commit.h
@@ -140,4 +140,6 @@ static inline int single_parent(struct commit *commit)
        return commit->parents && !commit->parents->next;
 }
 
+struct commit_list *reduce_heads(struct commit_list *heads);
+
 #endif /* COMMIT_H */