+void output_log (const char *, ...) PRINTF_FORMAT (1, 2);
+
+void output_set_title (const char *);
+void output_set_subtitle (const char *);
+void output_set_filename (const char *);
+
+const char *output_get_command_name (void);
+char *output_get_uppercase_command_name (void);
+
+size_t output_open_group (struct output_item *);
+void output_close_groups (size_t nesting_level);
+