* NOTMUCH_STATUS_TAG_TOO_LONG: A tag value is too long (exceeds
* NOTMUCH_TAG_MAX)
*
+ * NOTMUCH_STATUS_UNBALANCED_FREEZE_THAW: The notmuch_message_thaw
+ * function has been called more times than notmuch_message_freeze.
+ *
+ * And finally:
+ *
* NOTMUCH_STATUS_LAST_STATUS: Not an actual status value. Just a way
* to find out how many valid status values there are.
*/
NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID,
NOTMUCH_STATUS_NULL_POINTER,
NOTMUCH_STATUS_TAG_TOO_LONG,
+ NOTMUCH_STATUS_UNBALANCED_FREEZE_THAW,
NOTMUCH_STATUS_LAST_STATUS
} notmuch_status_t;
* reference the filename, and will not copy the entire contents of
* the file.
*
+ * If 'message' is not NULL, then, on successful return '*message'
+ * will be initialized to a message object that can be used for things
+ * such as adding tags to the just-added message. The user should call
+ * notmuch_message_destroy when done with the message. On any failure
+ * '*message' will be set to NULL.
+ *
* Return value:
*
* NOTMUCH_STATUS_SUCCESS: Message successfully added to database.
*/
notmuch_status_t
notmuch_database_add_message (notmuch_database_t *database,
- const char *filename);
+ const char *filename,
+ notmuch_message_t **message);
/* Find a message with the given messsage_id.
*
const char *
notmuch_thread_get_thread_id (notmuch_thread_t *thread);
+/* Get the subject of 'thread'
+ *
+ * The subject is taken from the first message (according to the query
+ * order---see notmuch_query_set_sort) in the query results that
+ * belongs to this thread.
+ *
+ * The returned string belongs to 'thread' and as such, should not be
+ * modified by the caller and will only be valid for as long as the
+ * thread is valid, (which is until notmuch_thread_destroy or until
+ * the query from which it derived is destroyed).
+ */
+const char *
+notmuch_thread_get_subject (notmuch_thread_t *thread);
+
+/* Get the tags for 'thread', returning a notmuch_tags_t object which
+ * can be used to iterate over all tags.
+ *
+ * Note: In the Notmuch database, tags are stored on individual
+ * messages, not on threads. So the tags returned here will be all
+ * tags of the messages which matched the search and which belong to
+ * this thread.
+ *
+ * The tags object is owned by the thread and as such, will only be
+ * valid for as long as the thread is valid, (for example, until
+ * notmuch_thread_destroy or until the query from which it derived is
+ * destroyed).
+ *
+ * Typical usage might be:
+ *
+ * notmuch_thread_t *thread;
+ * notmuch_tags_t *tags;
+ * const char *tag;
+ *
+ * thread = notmuch_thread_results_get (thread_results);
+ *
+ * for (tags = notmuch_thread_get_tags (thread);
+ * notmuch_tags_has_more (tags);
+ * notmuch_result_advance (tags))
+ * {
+ * tag = notmuch_tags_get (tags);
+ * ....
+ * }
+ *
+ * notmuch_thread_destroy (thread);
+ *
+ * Note that there's no explicit destructor needed for the
+ * notmuch_tags_t object. (For consistency, we do provide a
+ * notmuch_tags_destroy function, but there's no good reason to call
+ * it if the message is about to be destroyed).
+ */
+notmuch_tags_t *
+notmuch_thread_get_tags (notmuch_thread_t *thread);
+
/* Destroy a notmuch_thread_t object. */
void
notmuch_thread_destroy (notmuch_thread_t *thread);
*
* NOTMUCH_STATUS_NULL_POINTER: The 'tag' argument is NULL
*
- * NOTMUCH_STATUS_TAG_TOO_LONG: The length of 'tag' is longer than
- * too long (exceeds NOTMUCH_TAG_MAX)
+ * NOTMUCH_STATUS_TAG_TOO_LONG: The length of 'tag' is too long
+ * (exceeds NOTMUCH_TAG_MAX)
*/
notmuch_status_t
notmuch_message_add_tag (notmuch_message_t *message, const char *tag);
*
* Return value:
*
- * NOTMUCH_STATUS_SUCCESS: Tag successfully added to message
+ * NOTMUCH_STATUS_SUCCESS: Tag successfully removed from message
*
* NOTMUCH_STATUS_NULL_POINTER: The 'tag' argument is NULL
*
- * NOTMUCH_STATUS_TAG_TOO_LONG: The length of 'tag' is longer than
- * too long (exceeds NOTMUCH_TAG_MAX)
+ * NOTMUCH_STATUS_TAG_TOO_LONG: The length of 'tag' is too long
+ * (exceeds NOTMUCH_TAG_MAX)
*/
notmuch_status_t
notmuch_message_remove_tag (notmuch_message_t *message, const char *tag);
+/* Remove all tags from the given message.
+ *
+ * See notmuch_message_freeze for an example showing how to safely
+ * replace tag values.
+ */
+void
+notmuch_message_remove_all_tags (notmuch_message_t *message);
+
+/* Freeze the current state of 'message' within the database.
+ *
+ * This means that changes to the message state, (via
+ * notmuch_message_add_tag, notmuch_message_remove_tag, and
+ * notmuch_message_remove_all_tags), will not be committed to the
+ * database until the message is thawed with notmuch_message_thaw.
+ *
+ * Multiple calls to freeze/thaw are valid and these calls with
+ * "stack". That is there must be as many calls to thaw as to freeze
+ * before a message is actually thawed.
+ *
+ * The ability to do freeze/thaw allows for safe transactions to
+ * change tag values. For example, explicitly setting a message to
+ * have a given set of tags might look like this:
+ *
+ * notmuch_message_freeze (message);
+ *
+ * notmuch_message_remove_all_tags (message);
+ *
+ * for (i = 0; i < NUM_TAGS; i++)
+ * notmuch_message_add_tag (message, tags[i]);
+ *
+ * notmuch_message_thaw (message);
+ *
+ * With freeze/thaw used like this, the message in the database is
+ * guaranteed to have either the full set of original tag value, or
+ * the full set of new tag values, but nothing in between.
+ *
+ * Imagine the example above without freeze/thaw and the operation
+ * somehow getting interrupted. This could result in the message being
+ * left with no tags if the interruption happened after
+ * notmuch_message_remove_all_tags but before notmuch_message_add_tag.
+ */
+void
+notmuch_message_freeze (notmuch_message_t *message);
+
+/* Thaw the current 'message', synchronizing any changes that may have
+ * occurred while 'message' was frozen into the notmuch database.
+ *
+ * See notmuch_message_freeze for an example of how to use this
+ * function to safely provide tag changes.
+ *
+ * Multiple calls to freeze/thaw are valid and these calls with
+ * "stack". That is there must be as many calls to thaw as to freeze
+ * before a message is actually thawed.
+ *
+ * Return value:
+ *
+ * NOTMUCH_STATUS_SUCCESS: Message successfully thawed, (or at least
+ * its frozen count has successfully been reduced by 1).
+ *
+ * NOTMUCH_STATUS_UNBALANCE_FREEZE_THAW: An attempt was made to thaw
+ * an unfrozen message. That is, there have been an unbalanced
+ * number of calls to notmuch_message_freeze and
+ * notmuch_message_thaw.
+ */
+notmuch_status_t
+notmuch_message_thaw (notmuch_message_t *message);
+
/* Destroy a notmuch_message_t object.
*
* It can be useful to call this function in the case of a single
projects / notmuch / blobdiff