+ void (*show_part) (GMimeObject *part, int *part_count, int first),
+ void (*show_part_end) (GMimeObject *part));
+
+notmuch_status_t
+show_one_part (const char *filename, int part);
+
+char *
+json_quote_chararray (const void *ctx, const char *str, const size_t len);
+
+char *
+json_quote_str (const void *ctx, const char *str);