extern void cgit_print_diffstat(const unsigned char *old_sha1,
const unsigned char *new_sha1);
extern void cgit_print_diff(const char *new_hex, const char *old_hex,
extern void cgit_print_diffstat(const unsigned char *old_sha1,
const unsigned char *new_sha1);
extern void cgit_print_diff(const char *new_hex, const char *old_hex,