+/**
+ * Returns an iterator for a ';'-delimited list of configuration values
+ *
+ * These values reflect all configuration information given at the
+ * time the database was opened.
+ *
+ * @param[in] notmuch database
+ * @param[in] key configuration key
+ *
+ * @since libnotmuch 5.4 (notmuch 0.32)
+ *
+ * @retval NULL in case of error.
+ */
+notmuch_config_values_t *
+notmuch_config_get_values (notmuch_database_t *notmuch, notmuch_config_key_t key);
+
+/**
+ * Returns an iterator for a ';'-delimited list of configuration values
+ *
+ * These values reflect all configuration information given at the
+ * time the database was opened.
+ *
+ * @param[in] notmuch database
+ * @param[in] key configuration key
+ *
+ * @since libnotmuch 5.4 (notmuch 0.32)
+ *
+ * @retval NULL in case of error.
+ */
+notmuch_config_values_t *
+notmuch_config_get_values_string (notmuch_database_t *notmuch, const char *key);
+
+/**
+ * Is the given 'config_values' iterator pointing at a valid element.
+ *
+ * @param[in] values iterator
+ *
+ * @since libnotmuch 5.4 (notmuch 0.32)
+ *
+ * @retval FALSE if passed a NULL pointer, or the iterator is exhausted.
+ *
+ */
+notmuch_bool_t
+notmuch_config_values_valid (notmuch_config_values_t *values);
+
+/**
+ * Get the current value from the 'values' iterator
+ *
+ * @param[in] values iterator
+ *
+ * @since libnotmuch 5.4 (notmuch 0.32)
+ *
+ * @retval a string with the same lifetime as the iterator
+ */
+const char *
+notmuch_config_values_get (notmuch_config_values_t *values);
+
+/**
+ * Move the 'values' iterator to the next element
+ *
+ * @param[in,out] values iterator
+ *
+ * @since libnotmuch 5.4 (notmuch 0.32)
+ *
+ */
+void
+notmuch_config_values_move_to_next (notmuch_config_values_t *values);
+
+
+/**
+ * reset the 'values' iterator to the first element
+ *
+ * @param[in,out] values iterator. A NULL value is ignored.
+ *
+ * @since libnotmuch 5.4 (notmuch 0.32)
+ *
+ */
+void
+notmuch_config_values_start (notmuch_config_values_t *values);
+
+/**
+ * Destroy a config values iterator, along with any associated
+ * resources.
+ *
+ * @param[in,out] values iterator
+ *
+ * @since libnotmuch 5.4 (notmuch 0.32)
+ */
+void
+notmuch_config_values_destroy (notmuch_config_values_t *values);
+
+
+/**
+ * Returns an iterator for a (key, value) configuration pairs
+ *
+ * @param[in] notmuch database
+ * @param[in] prefix prefix for keys. Pass "" for all keys.
+ *
+ * @since libnotmuch 5.4 (notmuch 0.32)
+ *
+ * @retval NULL in case of error.
+ */
+notmuch_config_pairs_t *
+notmuch_config_get_pairs (notmuch_database_t *notmuch,
+ const char *prefix);
+
+/**
+ * Is the given 'config_pairs' iterator pointing at a valid element.
+ *
+ * @param[in] pairs iterator
+ *
+ * @since libnotmuch 5.4 (notmuch 0.32)
+ *
+ * @retval FALSE if passed a NULL pointer, or the iterator is exhausted.
+ *
+ */
+notmuch_bool_t
+notmuch_config_pairs_valid (notmuch_config_pairs_t *pairs);
+
+/**
+ * Move the 'config_pairs' iterator to the next element
+ *
+ * @param[in,out] pairs iterator
+ *
+ * @since libnotmuch 5.4 (notmuch 0.32)
+ *
+ */
+void
+notmuch_config_pairs_move_to_next (notmuch_config_pairs_t *pairs);
+
+/**
+ * Get the current key from the 'config_pairs' iterator
+ *
+ * @param[in] pairs iterator
+ *
+ * @since libnotmuch 5.4 (notmuch 0.32)
+ *
+ * @retval a string with the same lifetime as the iterator
+ */
+const char *
+notmuch_config_pairs_key (notmuch_config_pairs_t *pairs);
+
+/**
+ * Get the current value from the 'config_pairs' iterator
+ *
+ * @param[in] pairs iterator
+ *
+ * @since libnotmuch 5.4 (notmuch 0.32)
+ *
+ * @retval a string with the same lifetime as the iterator
+ */
+const char *
+notmuch_config_pairs_value (notmuch_config_pairs_t *pairs);
+
+/**
+ * Destroy a config_pairs iterator, along with any associated
+ * resources.
+ *
+ * @param[in,out] pairs iterator
+ *
+ * @since libnotmuch 5.4 (notmuch 0.32)
+ */
+void
+notmuch_config_pairs_destroy (notmuch_config_pairs_t *pairs);
+
+/**
+ * get a configuration value from an open database as Boolean
+ *
+ * This value reflects all configuration information given at the time
+ * the database was opened.
+ *
+ * @param[in] notmuch database
+ * @param[in] key configuration key
+ * @param[out] val configuration value, converted to Boolean
+ *
+ * @since libnotmuch 5.4 (notmuch 0.32)
+ *
+ * @retval #NOTMUCH_STATUS_ILLEGAL_ARGUMENT if either key is unknown
+ * or the corresponding value does not convert to Boolean.
+ */
+notmuch_status_t
+notmuch_config_get_bool (notmuch_database_t *notmuch,
+ notmuch_config_key_t key,
+ notmuch_bool_t *val);
+
+/**
+ * return the path of the config file loaded, if any
+ *
+ * @retval NULL if no config file was loaded
+ */
+const char *
+notmuch_config_path (notmuch_database_t *notmuch);
+