int log_tree_diff_flush(struct rev_info *);
int log_tree_commit(struct rev_info *, struct commit *);
int log_tree_opt_parse(struct rev_info *, const char **, int);
-void show_log(struct rev_info *opt, const char *sep);
+void show_log(struct rev_info *opt);
void show_decorations(struct commit *commit);
void log_write_email_headers(struct rev_info *opt, const char *name,
const char **subject_p,