struct rev_info; /* in revision.h, it circularly uses enum cmit_fmt */
extern void get_commit_format(const char *arg, struct rev_info *);
extern void format_commit_message(const struct commit *commit,
struct rev_info; /* in revision.h, it circularly uses enum cmit_fmt */
extern void get_commit_format(const char *arg, struct rev_info *);
extern void format_commit_message(const struct commit *commit,