notmuch_bool_t first, notmuch_bool_t output_body);
void
-format_headers_json (const void *ctx, GMimeMessage *message, notmuch_bool_t reply);
+format_headers_json (struct sprinter *sp, GMimeMessage *message,
+ notmuch_bool_t reply);
typedef enum {
NOTMUCH_SHOW_TEXT_PART_REPLY = 1 << 0,