+extern int cgit_diff_files(const unsigned char *old_sha1,
+ const unsigned char *new_sha1,
+ linediff_fn fn);
+
+extern void cgit_diff_tree(const unsigned char *old_sha1,
+ const unsigned char *new_sha1,
+ filepair_fn fn);
+
+extern void cgit_diff_commit(struct commit *commit, filepair_fn fn);
+