+/* Store an mtime within the database for 'directory'.
+ *
+ * The 'directory' should be an object retrieved from the database
+ * with notmuch_database_get_directory for a particular path.
+ *
+ * The intention is for the caller to use the mtime to allow efficient
+ * identification of new messages to be added to the database. The
+ * recommended usage is as follows:
+ *
+ * o Read the mtime of a directory from the filesystem
+ *
+ * o Call add_message for all mail files in the directory
+ *
+ * o Call notmuch_directory_set_mtime with the mtime read from the
+ * filesystem.
+ *
+ * Then, when wanting to check for updates to the directory in the
+ * future, the client can call notmuch_directory_get_mtime and know
+ * that it only needs to add files if the mtime of the directory and
+ * files are newer than the stored timestamp.
+ *
+ * Note: The notmuch_directory_get_mtime function does not allow the
+ * caller to distinguish a timestamp of 0 from a non-existent
+ * timestamp. So don't store a timestamp of 0 unless you are
+ * comfortable with that.
+ *
+ * Return value:
+ *
+ * NOTMUCH_STATUS_SUCCESS: mtime successfully stored in database.
+ *
+ * NOTMUCH_STATUS_XAPIAN_EXCEPTION: A Xapian exception
+ * occurred, mtime not stored.
+ *
+ * NOTMUCH_STATUS_READ_ONLY_DATABASE: Database was opened in read-only
+ * mode so directory mtime cannot be modified.
+ */
+notmuch_status_t
+notmuch_directory_set_mtime (notmuch_directory_t *directory,
+ time_t mtime);
+
+/* Get the mtime of a directory, (as previously stored with
+ * notmuch_directory_set_mtime).
+ *
+ * Returns 0 if no mtime has previously been stored for this
+ * directory.*/
+time_t
+notmuch_directory_get_mtime (notmuch_directory_t *directory);
+
+/* Get a notmuch_filenames_t iterator listing all the filenames of
+ * messages in the database within the given directory.
+ *
+ * The returned filenames will be the basename-entries only (not
+ * complete paths). */
+notmuch_filenames_t *
+notmuch_directory_get_child_files (notmuch_directory_t *directory);
+
+/* Get a notmuch_filenams_t iterator listing all the filenames of
+ * sub-directories in the database within the given directory.
+ *
+ * The returned filenames will be the basename-entries only (not
+ * complete paths). */
+notmuch_filenames_t *
+notmuch_directory_get_child_directories (notmuch_directory_t *directory);
+
+/* Destroy a notmuch_directory_t object. */
+void
+notmuch_directory_destroy (notmuch_directory_t *directory);
+
+/* Is the given 'filenames' iterator pointing at a valid filename.
+ *
+ * When this function returns TRUE, notmuch_filenames_get will return
+ * a valid string. Whereas when this function returns FALSE,
+ * notmuch_filenames_get will return NULL.
+ *
+ * It is acceptable to pass NULL for 'filenames', in which case this
+ * function will always return FALSE.
+ */
+notmuch_bool_t
+notmuch_filenames_valid (notmuch_filenames_t *filenames);
+
+/* Get the current filename from 'filenames' as a string.
+ *
+ * Note: The returned string belongs to 'filenames' and has a lifetime
+ * identical to it (and the directory to which it ultimately belongs).
+ *
+ * It is acceptable to pass NULL for 'filenames', in which case this
+ * function will always return NULL.
+ */
+const char *
+notmuch_filenames_get (notmuch_filenames_t *filenames);
+
+/* Move the 'filenames' iterator to the next filename.
+ *
+ * If 'filenames' is already pointing at the last filename then the
+ * iterator will be moved to a point just beyond that last filename,
+ * (where notmuch_filenames_valid will return FALSE and
+ * notmuch_filenames_get will return NULL).
+ *
+ * It is acceptable to pass NULL for 'filenames', in which case this
+ * function will do nothing.
+ */
+void
+notmuch_filenames_move_to_next (notmuch_filenames_t *filenames);
+
+/* Destroy a notmuch_filenames_t object.
+ *
+ * It's not strictly necessary to call this function. All memory from
+ * the notmuch_filenames_t object will be reclaimed when the
+ * containing directory object is destroyed.
+ *
+ * It is acceptable to pass NULL for 'filenames', in which case this
+ * function will do nothing.
+ */
+void
+notmuch_filenames_destroy (notmuch_filenames_t *filenames);
+