+/* Coerce a notmuch_private_status_t value to a notmuch_status_t
+ * value, generating an internal error if the private value is equal
+ * to or greater than NOTMUCH_STATUS_LAST_STATUS. (The idea here is
+ * that the caller has previously handled any expected
+ * notmuch_private_status_t values.)
+ */
+#define COERCE_STATUS(private_status, format, ...) \
+ ((private_status >= (notmuch_private_status_t) NOTMUCH_STATUS_LAST_STATUS)\
+ ? \
+ (notmuch_status_t) _internal_error (format " (%s).\n", \
+ ##__VA_ARGS__, \
+ __location__) \
+ : \
+ (notmuch_status_t) private_status)
+
+/* database.cc */
+
+/* Lookup a prefix value by name.
+ *
+ * XXX: This should really be static inside of message.cc, and we can
+ * do that once we convert database.cc to use the
+ * _notmuch_message_add/remove_term functions. */
+const char *
+_find_prefix (const char *name);
+
+/* thread.cc */
+
+notmuch_thread_t *
+_notmuch_thread_create (const void *talloc_owner,
+ notmuch_database_t *notmuch,
+ const char *thread_id);
+
+void
+_notmuch_thread_add_message (notmuch_thread_t *thread,
+ notmuch_message_t *message);
+
+/* message.cc */
+
+notmuch_message_t *
+_notmuch_message_create (const void *talloc_owner,
+ notmuch_database_t *notmuch,
+ unsigned int doc_id,
+ notmuch_private_status_t *status);
+
+notmuch_message_t *
+_notmuch_message_create_for_message_id (const void *talloc_owner,
+ notmuch_database_t *notmuch,
+ const char *message_id,
+ notmuch_private_status_t *status);
+
+const char *
+_notmuch_message_get_subject (notmuch_message_t *message);
+
+notmuch_private_status_t
+_notmuch_message_add_term (notmuch_message_t *message,
+ const char *prefix_name,
+ const char *value);
+
+notmuch_private_status_t
+_notmuch_message_remove_term (notmuch_message_t *message,
+ const char *prefix_name,
+ const char *value);
+
+notmuch_private_status_t
+_notmuch_message_gen_terms (notmuch_message_t *message,
+ const char *prefix_name,
+ const char *text);
+
+void
+_notmuch_message_set_filename (notmuch_message_t *message,
+ const char *filename);
+
+void
+_notmuch_message_add_thread_id (notmuch_message_t *message,
+ const char *thread_id);
+
+void
+_notmuch_message_ensure_thread_id (notmuch_message_t *message);
+
+void
+_notmuch_message_set_date (notmuch_message_t *message,
+ const char *date);
+
+void
+_notmuch_message_sync (notmuch_message_t *message);
+
+/* index.cc */
+
+notmuch_status_t
+_notmuch_message_index_file (notmuch_message_t *message,
+ const char *filename);
+
+/* message-file.c */