1 /* notmuch - Not much of an email library, (just index and search)
3 * Copyright © 2009 Carl Worth
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see http://www.gnu.org/licenses/ .
18 * Author: Carl Worth <cworth@cworth.org>
25 # define NOTMUCH_BEGIN_DECLS extern "C" {
26 # define NOTMUCH_END_DECLS }
28 # define NOTMUCH_BEGIN_DECLS
29 # define NOTMUCH_END_DECLS
44 typedef int notmuch_bool_t;
46 /* Status codes used for the return values of most functions.
48 * A zero value (NOTMUCH_STATUS_SUCCESS) indicates that the function
49 * completed without error. Any other value indicates an error as
52 * NOTMUCH_STATUS_SUCCESS: No error occurred.
54 * NOTMUCH_STATUS_OUT_OF_MEMORY: Out of memory
56 * XXX: We don't really want to expose this lame XAPIAN_EXCEPTION
57 * value. Instead we should map to things like DATABASE_LOCKED or
60 * NOTMUCH_STATUS_READONLY_DATABASE: An attempt was made to write to a
61 * database opened in read-only mode.
63 * NOTMUCH_STATUS_XAPIAN_EXCEPTION: A Xapian exception occurred
65 * NOTMUCH_STATUS_FILE_ERROR: An error occurred trying to read or
66 * write to a file (this could be file not found, permission
69 * NOTMUCH_STATUS_FILE_NOT_EMAIL: A file was presented that doesn't
70 * appear to be an email message.
72 * NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID: A file contains a message ID
73 * that is identical to a message already in the database.
75 * NOTMUCH_STATUS_NULL_POINTER: The user erroneously passed a NULL
76 * pointer to a notmuch function.
78 * NOTMUCH_STATUS_TAG_TOO_LONG: A tag value is too long (exceeds
81 * NOTMUCH_STATUS_UNBALANCED_FREEZE_THAW: The notmuch_message_thaw
82 * function has been called more times than notmuch_message_freeze.
86 * NOTMUCH_STATUS_LAST_STATUS: Not an actual status value. Just a way
87 * to find out how many valid status values there are.
89 typedef enum _notmuch_status {
90 NOTMUCH_STATUS_SUCCESS = 0,
91 NOTMUCH_STATUS_OUT_OF_MEMORY,
92 NOTMUCH_STATUS_READONLY_DATABASE,
93 NOTMUCH_STATUS_XAPIAN_EXCEPTION,
94 NOTMUCH_STATUS_FILE_ERROR,
95 NOTMUCH_STATUS_FILE_NOT_EMAIL,
96 NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID,
97 NOTMUCH_STATUS_NULL_POINTER,
98 NOTMUCH_STATUS_TAG_TOO_LONG,
99 NOTMUCH_STATUS_UNBALANCED_FREEZE_THAW,
101 NOTMUCH_STATUS_LAST_STATUS
104 /* Get a string representation of a notmuch_status_t value.
106 * The result is readonly.
109 notmuch_status_to_string (notmuch_status_t status);
111 /* Various opaque data types. For each notmuch_<foo>_t see the various
112 * notmuch_<foo> functions below. */
113 typedef struct _notmuch_database notmuch_database_t;
114 typedef struct _notmuch_query notmuch_query_t;
115 typedef struct _notmuch_threads notmuch_threads_t;
116 typedef struct _notmuch_thread notmuch_thread_t;
117 typedef struct _notmuch_messages notmuch_messages_t;
118 typedef struct _notmuch_message notmuch_message_t;
119 typedef struct _notmuch_tags notmuch_tags_t;
120 typedef struct _notmuch_directory notmuch_directory_t;
121 typedef struct _notmuch_filenames notmuch_filenames_t;
123 /* Create a new, empty notmuch database located at 'path'.
125 * The path should be a top-level directory to a collection of
126 * plain-text email messages (one message per file). This call will
127 * create a new ".notmuch" directory within 'path' where notmuch will
130 * After a successful call to notmuch_database_create, the returned
131 * database will be open so the caller should call
132 * notmuch_database_close when finished with it.
134 * The database will not yet have any data in it
135 * (notmuch_database_create itself is a very cheap function). Messages
136 * contained within 'path' can be added to the database by calling
137 * notmuch_database_add_message.
139 * In case of any failure, this function returns NULL, (after printing
140 * an error message on stderr).
143 notmuch_database_create (const char *path);
146 NOTMUCH_DATABASE_MODE_READ_ONLY = 0,
147 NOTMUCH_DATABASE_MODE_READ_WRITE
148 } notmuch_database_mode_t;
150 /* XXX: I think I'd like this to take an extra argument of
151 * notmuch_status_t* for returning a status value on failure. */
153 /* Open an existing notmuch database located at 'path'.
155 * The database should have been created at some time in the past,
156 * (not necessarily by this process), by calling
157 * notmuch_database_create with 'path'. By default the database should be
158 * opened for reading only. In order to write to the database you need to
159 * pass the NOTMUCH_DATABASE_MODE_WRITABLE mode.
161 * An existing notmuch database can be identified by the presence of a
162 * directory named ".notmuch" below 'path'.
164 * The caller should call notmuch_database_close when finished with
167 * In case of any failure, this function returns NULL, (after printing
168 * an error message on stderr).
171 notmuch_database_open (const char *path,
172 notmuch_database_mode_t mode);
174 /* Close the given notmuch database, freeing all associated
175 * resources. See notmuch_database_open. */
177 notmuch_database_close (notmuch_database_t *database);
179 /* Return the database path of the given database.
181 * The return value is a string owned by notmuch so should not be
182 * modified nor freed by the caller. */
184 notmuch_database_get_path (notmuch_database_t *database);
186 /* Retrieve a directory object from the database for 'path'.
188 * Here, 'path' should be a path relative to the path of 'database'
189 * (see notmuch_database_get_path), or else should be an absolute path
190 * with initial components that match the path of 'database'.
192 * Note: The resulting notmuch_directory_t object will represent the
193 * state as it currently exists in the database, (and will not reflect
194 * subsequent changes).
196 notmuch_directory_t *
197 notmuch_database_get_directory (notmuch_database_t *database,
200 /* Add a new message to the given notmuch database.
202 * Here,'filename' should be a path relative to the path of
203 * 'database' (see notmuch_database_get_path), or else should be an
204 * absolute filename with initial components that match the path of
207 * The file should be a single mail message (not a multi-message mbox)
208 * that is expected to remain at its current location, (since the
209 * notmuch database will reference the filename, and will not copy the
210 * entire contents of the file.
212 * If 'message' is not NULL, then, on successful return '*message'
213 * will be initialized to a message object that can be used for things
214 * such as adding tags to the just-added message. The user should call
215 * notmuch_message_destroy when done with the message. On any failure
216 * '*message' will be set to NULL.
220 * NOTMUCH_STATUS_SUCCESS: Message successfully added to database.
222 * NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID: Message has the same message
223 * ID as another message already in the database. Nothing added
226 * NOTMUCH_STATUS_FILE_ERROR: an error occurred trying to open the
227 * file, (such as permission denied, or file not found,
228 * etc.). Nothing added to the database.
230 * NOTMUCH_STATUS_FILE_NOT_EMAIL: the contents of filename don't look
231 * like an email message. Nothing added to the database.
234 notmuch_database_add_message (notmuch_database_t *database,
235 const char *filename,
236 notmuch_message_t **message);
238 /* Remove a message from the given notmuch database.
240 * Note that the only this particular filename association is removed
241 * from the database. If the same message (as determined by the
242 * message ID) is still available via other filenames, then the
243 * message will persist in the database for those filenames. When the
244 * last filename is removed for a particular message, the database
245 * content for that message will be entirely removed.
248 notmuch_database_remove_message (notmuch_database_t *database,
249 const char *filename);
251 /* Find a message with the given message_id.
253 * If the database contains a message with the given message_id, then
254 * a new notmuch_message_t object is returned. The caller should call
255 * notmuch_message_destroy when done with the message.
257 * If no message is found with the given message_id or if an
258 * out-of-memory situation occurs, this function returns NULL.
261 notmuch_database_find_message (notmuch_database_t *database,
262 const char *message_id);
264 /* Return a list of all tags found in the database.
266 * This function creates a list of all tags found in the database. The
267 * resulting list contains all tags from all messages found in the database.
269 * On error this function returns NULL.
272 notmuch_database_get_all_tags (notmuch_database_t *db);
274 /* Create a new query for 'database'.
276 * Here, 'database' should be an open database, (see
277 * notmuch_database_open and notmuch_database_create).
279 * For the query string, we'll document the syntax here more
280 * completely in the future, but it's likely to be a specialized
281 * version of the general Xapian query syntax:
283 * http://xapian.org/docs/queryparser.html
285 * As a special case, passing a length-zero string, (that is ""), will
286 * result in a query that returns all messages in the database.
288 * See notmuch_query_set_sort for controlling the order of results and
289 * notmuch_query_search to actually execute the query.
291 * User should call notmuch_query_destroy when finished with this
294 * Will return NULL if insufficient memory is available.
297 notmuch_query_create (notmuch_database_t *database,
298 const char *query_string);
300 /* Sort values for notmuch_query_set_sort */
302 NOTMUCH_SORT_OLDEST_FIRST,
303 NOTMUCH_SORT_NEWEST_FIRST,
304 NOTMUCH_SORT_MESSAGE_ID
307 /* Specify the sorting desired for this query. */
309 notmuch_query_set_sort (notmuch_query_t *query, notmuch_sort_t sort);
311 /* Execute a query for threads, returning a notmuch_threads_t object
312 * which can be used to iterate over the results. The returned threads
313 * object is owned by the query and as such, will only be valid until
314 * notmuch_query_destroy.
316 * Typical usage might be:
318 * notmuch_query_t *query;
319 * notmuch_threads_t *threads;
320 * notmuch_thread_t *thread;
322 * query = notmuch_query_create (database, query_string);
324 * for (threads = notmuch_query_search_threads (query);
325 * notmuch_threads_has_more (threads);
326 * notmuch_threads_advance (threads))
328 * thread = notmuch_threads_get (threads);
330 * notmuch_thread_destroy (thread);
333 * notmuch_query_destroy (query);
335 * Note: If you are finished with a thread before its containing
336 * query, you can call notmuch_thread_destroy to clean up some memory
337 * sooner (as in the above example). Otherwise, if your thread objects
338 * are long-lived, then you don't need to call notmuch_thread_destroy
339 * and all the memory will still be reclaimed when the query is
342 * Note that there's no explicit destructor needed for the
343 * notmuch_threads_t object. (For consistency, we do provide a
344 * notmuch_threads_destroy function, but there's no good reason
345 * to call it if the query is about to be destroyed).
348 notmuch_query_search_threads (notmuch_query_t *query);
350 /* Execute a query for messages, returning a notmuch_messages_t object
351 * which can be used to iterate over the results. The returned
352 * messages object is owned by the query and as such, will only be
353 * valid until notmuch_query_destroy.
355 * Typical usage might be:
357 * notmuch_query_t *query;
358 * notmuch_messages_t *messages;
359 * notmuch_message_t *message;
361 * query = notmuch_query_create (database, query_string);
363 * for (messages = notmuch_query_search_messages (query);
364 * notmuch_messages_has_more (messages);
365 * notmuch_messages_advance (messages))
367 * message = notmuch_messages_get (messages);
369 * notmuch_message_destroy (message);
372 * notmuch_query_destroy (query);
374 * Note: If you are finished with a message before its containing
375 * query, you can call notmuch_message_destroy to clean up some memory
376 * sooner (as in the above example). Otherwise, if your message
377 * objects are long-lived, then you don't need to call
378 * notmuch_message_destroy and all the memory will still be reclaimed
379 * when the query is destroyed.
381 * Note that there's no explicit destructor needed for the
382 * notmuch_messages_t object. (For consistency, we do provide a
383 * notmuch_messages_destroy function, but there's no good
384 * reason to call it if the query is about to be destroyed).
387 notmuch_query_search_messages (notmuch_query_t *query);
389 /* Destroy a notmuch_query_t along with any associated resources.
391 * This will in turn destroy any notmuch_threads_t and
392 * notmuch_messages_t objects generated by this query, (and in
393 * turn any notmuch_thrad_t and notmuch_message_t objects generated
394 * from those results, etc.), if such objects haven't already been
398 notmuch_query_destroy (notmuch_query_t *query);
400 /* Does the given notmuch_threads_t object contain any more
403 * When this function returns TRUE, notmuch_threads_get will
404 * return a valid object. Whereas when this function returns FALSE,
405 * notmuch_threads_get will return NULL.
407 * See the documentation of notmuch_query_search_threads for example
408 * code showing how to iterate over a notmuch_threads_t object.
411 notmuch_threads_has_more (notmuch_threads_t *threads);
413 /* Get the current thread from 'threads' as a notmuch_thread_t.
415 * Note: The returned thread belongs to 'threads' and has a lifetime
416 * identical to it (and the query to which it belongs).
418 * See the documentation of notmuch_query_search_threads for example
419 * code showing how to iterate over a notmuch_threads_t object.
421 * If an out-of-memory situation occurs, this function will return
425 notmuch_threads_get (notmuch_threads_t *threads);
427 /* Advance the 'threads' iterator to the next thread.
429 * See the documentation of notmuch_query_search_threads for example
430 * code showing how to iterate over a notmuch_threads_t object.
433 notmuch_threads_advance (notmuch_threads_t *threads);
435 /* Destroy a notmuch_threads_t object.
437 * It's not strictly necessary to call this function. All memory from
438 * the notmuch_threads_t object will be reclaimed when the
439 * containg query object is destroyed.
442 notmuch_threads_destroy (notmuch_threads_t *threads);
444 /* Return an estimate of the number of messages matching a search
446 * This function performs a search and returns Xapian's best
447 * guess as to number of matching messages.
450 notmuch_query_count_messages (notmuch_query_t *query);
452 /* Get the thread ID of 'thread'.
454 * The returned string belongs to 'thread' and as such, should not be
455 * modified by the caller and will only be valid for as long as the
456 * thread is valid, (which is until notmuch_thread_destroy or until
457 * the query from which it derived is destroyed).
460 notmuch_thread_get_thread_id (notmuch_thread_t *thread);
462 /* Get the total number of messages in 'thread'.
464 * This count consists of all messages in the database belonging to
465 * this thread. Contrast with notmuch_thread_get_matched_messages() .
468 notmuch_thread_get_total_messages (notmuch_thread_t *thread);
470 /* Get a notmuch_messages_t iterator for the top-level messages in
473 * This iterator will not necessarily iterate over all of the messages
474 * in the thread. It will only iterate over the messages in the thread
475 * which are not replies to other messages in the thread.
477 * To iterate over all messages in the thread, the caller will need to
478 * iterate over the result of notmuch_message_get_replies for each
479 * top-level message (and do that recursively for the resulting
483 notmuch_thread_get_toplevel_messages (notmuch_thread_t *thread);
485 /* Get the number of messages in 'thread' that matched the search.
487 * This count includes only the messages in this thread that were
488 * matched by the search from which the thread was created. Contrast
489 * with notmuch_thread_get_total_messages() .
492 notmuch_thread_get_matched_messages (notmuch_thread_t *thread);
494 /* Get the authors of 'thread'
496 * The returned string is a comma-separated list of the names of the
497 * authors of mail messages in the query results that belong to this
500 * The returned string belongs to 'thread' and as such, should not be
501 * modified by the caller and will only be valid for as long as the
502 * thread is valid, (which is until notmuch_thread_destroy or until
503 * the query from which it derived is destroyed).
506 notmuch_thread_get_authors (notmuch_thread_t *thread);
508 /* Get the subject of 'thread'
510 * The subject is taken from the first message (according to the query
511 * order---see notmuch_query_set_sort) in the query results that
512 * belongs to this thread.
514 * The returned string belongs to 'thread' and as such, should not be
515 * modified by the caller and will only be valid for as long as the
516 * thread is valid, (which is until notmuch_thread_destroy or until
517 * the query from which it derived is destroyed).
520 notmuch_thread_get_subject (notmuch_thread_t *thread);
522 /* Get the date of the oldest message in 'thread' as a time_t value.
525 notmuch_thread_get_oldest_date (notmuch_thread_t *thread);
527 /* Get the date of the oldest message in 'thread' as a time_t value.
530 notmuch_thread_get_newest_date (notmuch_thread_t *thread);
532 /* Get the tags for 'thread', returning a notmuch_tags_t object which
533 * can be used to iterate over all tags.
535 * Note: In the Notmuch database, tags are stored on individual
536 * messages, not on threads. So the tags returned here will be all
537 * tags of the messages which matched the search and which belong to
540 * The tags object is owned by the thread and as such, will only be
541 * valid for as long as the thread is valid, (for example, until
542 * notmuch_thread_destroy or until the query from which it derived is
545 * Typical usage might be:
547 * notmuch_thread_t *thread;
548 * notmuch_tags_t *tags;
551 * thread = notmuch_threads_get (threads);
553 * for (tags = notmuch_thread_get_tags (thread);
554 * notmuch_tags_has_more (tags);
555 * notmuch_result_advance (tags))
557 * tag = notmuch_tags_get (tags);
561 * notmuch_thread_destroy (thread);
563 * Note that there's no explicit destructor needed for the
564 * notmuch_tags_t object. (For consistency, we do provide a
565 * notmuch_tags_destroy function, but there's no good reason to call
566 * it if the message is about to be destroyed).
569 notmuch_thread_get_tags (notmuch_thread_t *thread);
571 /* Destroy a notmuch_thread_t object. */
573 notmuch_thread_destroy (notmuch_thread_t *thread);
575 /* Does the given notmuch_messages_t object contain any more
578 * When this function returns TRUE, notmuch_messages_get will return a
579 * valid object. Whereas when this function returns FALSE,
580 * notmuch_messages_get will return NULL.
582 * See the documentation of notmuch_query_search_messages for example
583 * code showing how to iterate over a notmuch_messages_t object.
586 notmuch_messages_has_more (notmuch_messages_t *messages);
588 /* Get the current message from 'messages' as a notmuch_message_t.
590 * Note: The returned message belongs to 'messages' and has a lifetime
591 * identical to it (and the query to which it belongs).
593 * See the documentation of notmuch_query_search_messages for example
594 * code showing how to iterate over a notmuch_messages_t object.
596 * If an out-of-memory situation occurs, this function will return
600 notmuch_messages_get (notmuch_messages_t *messages);
602 /* Advance the 'messages' iterator to the next result.
604 * See the documentation of notmuch_query_search_messages for example
605 * code showing how to iterate over a notmuch_messages_t object.
608 notmuch_messages_advance (notmuch_messages_t *messages);
610 /* Destroy a notmuch_messages_t object.
612 * It's not strictly necessary to call this function. All memory from
613 * the notmuch_messages_t object will be reclaimed when the containing
614 * query object is destroyed.
617 notmuch_messages_destroy (notmuch_messages_t *messages);
619 /* Return a list of tags from all messages.
621 * The resulting list is guaranteed not to contain duplicated tags.
623 * WARNING: You can no longer iterate over messages after calling this
624 * function, because the iterator will point at the end of the list.
625 * We do not have a function to reset the iterator yet and the only
626 * way how you can iterate over the list again is to recreate the
629 * The function returns NULL on error.
632 notmuch_messages_collect_tags (notmuch_messages_t *messages);
634 /* Get the message ID of 'message'.
636 * The returned string belongs to 'message' and as such, should not be
637 * modified by the caller and will only be valid for as long as the
638 * message is valid, (which is until the query from which it derived
641 * This function will not return NULL since Notmuch ensures that every
642 * message has a unique message ID, (Notmuch will generate an ID for a
643 * message if the original file does not contain one).
646 notmuch_message_get_message_id (notmuch_message_t *message);
648 /* Get the thread ID of 'message'.
650 * The returned string belongs to 'message' and as such, should not be
651 * modified by the caller and will only be valid for as long as the
652 * message is valid, (for example, until the user calls
653 * notmuch_message_destroy on 'message' or until a query from which it
654 * derived is destroyed).
656 * This function will not return NULL since Notmuch ensures that every
657 * message belongs to a single thread.
660 notmuch_message_get_thread_id (notmuch_message_t *message);
662 /* Get a notmuch_messages_t iterator for all of the replies to
665 * Note: This call only makes sense if 'message' was ultimately
666 * obtained from a notmuch_thread_t object, (such as by coming
667 * directly from the result of calling notmuch_thread_get_
668 * toplevel_messages or by any number of subsequent
669 * calls to notmuch_message_get_replies).
671 * If 'message' was obtained through some non-thread means, (such as
672 * by a call to notmuch_query_search_messages), then this function
675 * If there are no replies to 'message', this function will return
676 * NULL. (Note that notmuch_messages_has_more will accept that NULL
677 * value as legitimate, and simply return FALSE for it.)
680 notmuch_message_get_replies (notmuch_message_t *message);
682 /* Get a filename for the email corresponding to 'message'.
684 * The returned filename is an absolute filename, (the initial
685 * component will match notmuch_database_get_path() ).
687 * The returned string belongs to the message so should not be
688 * modified or freed by the caller (nor should it be referenced after
689 * the message is destroyed).
691 * Note: If this message corresponds to multiple files in the mail
692 * store, (that is, multiple files contain identical message IDs),
693 * this function will arbitrarily return a single one of those
697 notmuch_message_get_filename (notmuch_message_t *message);
700 typedef enum _notmuch_message_flag {
701 NOTMUCH_MESSAGE_FLAG_MATCH,
702 } notmuch_message_flag_t;
704 /* Get a value of a flag for the email corresponding to 'message'. */
706 notmuch_message_get_flag (notmuch_message_t *message,
707 notmuch_message_flag_t flag);
709 /* Set a value of a flag for the email corresponding to 'message'. */
711 notmuch_message_set_flag (notmuch_message_t *message,
712 notmuch_message_flag_t flag, notmuch_bool_t value);
714 /* Get the date of 'message' as a time_t value.
716 * For the original textual representation of the Date header from the
717 * message call notmuch_message_get_header() with a header value of
720 notmuch_message_get_date (notmuch_message_t *message);
722 /* Get the value of the specified header from 'message'.
724 * The value will be read from the actual message file, not from the
725 * notmuch database. The header name is case insensitive.
727 * The returned string belongs to the message so should not be
728 * modified or freed by the caller (nor should it be referenced after
729 * the message is destroyed).
731 * Returns an empty string ("") if the message does not contain a
732 * header line matching 'header'. Returns NULL if any error occurs.
735 notmuch_message_get_header (notmuch_message_t *message, const char *header);
737 /* Get the tags for 'message', returning a notmuch_tags_t object which
738 * can be used to iterate over all tags.
740 * The tags object is owned by the message and as such, will only be
741 * valid for as long as the message is valid, (which is until the
742 * query from which it derived is destroyed).
744 * Typical usage might be:
746 * notmuch_message_t *message;
747 * notmuch_tags_t *tags;
750 * message = notmuch_database_find_message (database, message_id);
752 * for (tags = notmuch_message_get_tags (message);
753 * notmuch_tags_has_more (tags);
754 * notmuch_result_advance (tags))
756 * tag = notmuch_tags_get (tags);
760 * notmuch_message_destroy (message);
762 * Note that there's no explicit destructor needed for the
763 * notmuch_tags_t object. (For consistency, we do provide a
764 * notmuch_tags_destroy function, but there's no good reason to call
765 * it if the message is about to be destroyed).
768 notmuch_message_get_tags (notmuch_message_t *message);
770 /* The longest possible tag value. */
771 #define NOTMUCH_TAG_MAX 200
773 /* Add a tag to the given message.
777 * NOTMUCH_STATUS_SUCCESS: Tag successfully added to message
779 * NOTMUCH_STATUS_NULL_POINTER: The 'tag' argument is NULL
781 * NOTMUCH_STATUS_TAG_TOO_LONG: The length of 'tag' is too long
782 * (exceeds NOTMUCH_TAG_MAX)
785 notmuch_message_add_tag (notmuch_message_t *message, const char *tag);
787 /* Remove a tag from the given message.
791 * NOTMUCH_STATUS_SUCCESS: Tag successfully removed from message
793 * NOTMUCH_STATUS_NULL_POINTER: The 'tag' argument is NULL
795 * NOTMUCH_STATUS_TAG_TOO_LONG: The length of 'tag' is too long
796 * (exceeds NOTMUCH_TAG_MAX)
799 notmuch_message_remove_tag (notmuch_message_t *message, const char *tag);
801 /* Remove all tags from the given message.
803 * See notmuch_message_freeze for an example showing how to safely
804 * replace tag values.
807 notmuch_message_remove_all_tags (notmuch_message_t *message);
809 /* Freeze the current state of 'message' within the database.
811 * This means that changes to the message state, (via
812 * notmuch_message_add_tag, notmuch_message_remove_tag, and
813 * notmuch_message_remove_all_tags), will not be committed to the
814 * database until the message is thawed with notmuch_message_thaw.
816 * Multiple calls to freeze/thaw are valid and these calls with
817 * "stack". That is there must be as many calls to thaw as to freeze
818 * before a message is actually thawed.
820 * The ability to do freeze/thaw allows for safe transactions to
821 * change tag values. For example, explicitly setting a message to
822 * have a given set of tags might look like this:
824 * notmuch_message_freeze (message);
826 * notmuch_message_remove_all_tags (message);
828 * for (i = 0; i < NUM_TAGS; i++)
829 * notmuch_message_add_tag (message, tags[i]);
831 * notmuch_message_thaw (message);
833 * With freeze/thaw used like this, the message in the database is
834 * guaranteed to have either the full set of original tag value, or
835 * the full set of new tag values, but nothing in between.
837 * Imagine the example above without freeze/thaw and the operation
838 * somehow getting interrupted. This could result in the message being
839 * left with no tags if the interruption happened after
840 * notmuch_message_remove_all_tags but before notmuch_message_add_tag.
843 notmuch_message_freeze (notmuch_message_t *message);
845 /* Thaw the current 'message', synchronizing any changes that may have
846 * occurred while 'message' was frozen into the notmuch database.
848 * See notmuch_message_freeze for an example of how to use this
849 * function to safely provide tag changes.
851 * Multiple calls to freeze/thaw are valid and these calls with
852 * "stack". That is there must be as many calls to thaw as to freeze
853 * before a message is actually thawed.
857 * NOTMUCH_STATUS_SUCCESS: Message successfully thawed, (or at least
858 * its frozen count has successfully been reduced by 1).
860 * NOTMUCH_STATUS_UNBALANCE_FREEZE_THAW: An attempt was made to thaw
861 * an unfrozen message. That is, there have been an unbalanced
862 * number of calls to notmuch_message_freeze and
863 * notmuch_message_thaw.
866 notmuch_message_thaw (notmuch_message_t *message);
868 /* Destroy a notmuch_message_t object.
870 * It can be useful to call this function in the case of a single
871 * query object with many messages in the result, (such as iterating
872 * over the entire database). Otherwise, it's fine to never call this
873 * function and there will still be no memory leaks. (The memory from
874 * the messages get reclaimed when the containing query is destroyed.)
877 notmuch_message_destroy (notmuch_message_t *message);
879 /* Does the given notmuch_tags_t object contain any more tags.
881 * When this function returns TRUE, notmuch_tags_get will return a
882 * valid string. Whereas when this function returns FALSE,
883 * notmuch_tags_get will return NULL.
885 * See the documentation of notmuch_message_get_tags for example code
886 * showing how to iterate over a notmuch_tags_t object.
889 notmuch_tags_has_more (notmuch_tags_t *tags);
891 /* Get the current tag from 'tags' as a string.
893 * Note: The returned string belongs to 'tags' and has a lifetime
894 * identical to it (and the query to which it ultimately belongs).
896 * See the documentation of notmuch_message_get_tags for example code
897 * showing how to iterate over a notmuch_tags_t object.
900 notmuch_tags_get (notmuch_tags_t *tags);
902 /* Advance the 'tags' iterator to the next tag.
904 * See the documentation of notmuch_message_get_tags for example code
905 * showing how to iterate over a notmuch_tags_t object.
908 notmuch_tags_advance (notmuch_tags_t *tags);
910 /* Destroy a notmuch_tags_t object.
912 * It's not strictly necessary to call this function. All memory from
913 * the notmuch_tags_t object will be reclaimed when the containing
914 * message or query objects are destroyed.
917 notmuch_tags_destroy (notmuch_tags_t *tags);
919 /* Store an mtime within the database for 'directory'.
921 * The 'directory' should be an object retrieved from the database
922 * with notmuch_database_get_directory for a particular path.
924 * The intention is for the caller to use the mtime to allow efficient
925 * identification of new messages to be added to the database. The
926 * recommended usage is as follows:
928 * o Read the mtime of a directory from the filesystem
930 * o Call add_message for all mail files in the directory
932 * o Call notmuch_directory_set_mtime with the mtime read from the
935 * Then, when wanting to check for updates to the directory in the
936 * future, the client can call notmuch_directory_get_mtime and know
937 * that it only needs to add files if the mtime of the directory and
938 * files are newer than the stored timestamp.
940 * Note: The notmuch_directory_get_mtime function does not allow the
941 * caller to distinguish a timestamp of 0 from a non-existent
942 * timestamp. So don't store a timestamp of 0 unless you are
943 * comfortable with that.
947 * NOTMUCH_STATUS_SUCCESS: mtime successfully stored in database.
949 * NOTMUCH_STATUS_XAPIAN_EXCEPTION: A Xapian exception
950 * occurred, mtime not stored.
953 notmuch_directory_set_mtime (notmuch_directory_t *directory,
956 /* Get the mtime of a directory, (as previously stored with
957 * notmuch_directory_set_mtime).
959 * Returns 0 if not mtime has previously been stored for this
962 notmuch_directory_get_mtime (notmuch_directory_t *directory);
964 /* Get a notmuch_filenames_t iterator listing all the filenames of
965 * messages in the database within the given directory.
967 * The returned filenames will be the basename-entries only (not
968 * complete paths). */
969 notmuch_filenames_t *
970 notmuch_directory_get_child_files (notmuch_directory_t *directory);
972 /* Get a notmuch_filenams_t iterator listing all the filenames of
973 * sub-directories in the database within the given directory.
975 * The returned filenames will be the basename-entries only (not
976 * complete paths). */
977 notmuch_filenames_t *
978 notmuch_directory_get_child_directories (notmuch_directory_t *directory);
980 /* Destroy a notmuch_directory_t object. */
982 notmuch_directory_destroy (notmuch_directory_t *directory);
984 /* Does the given notmuch_filenames_t object contain any more
987 * When this function returns TRUE, notmuch_filenames_get will return
988 * a valid string. Whereas when this function returns FALSE,
989 * notmuch_filenames_get will return NULL.
992 notmuch_filenames_has_more (notmuch_filenames_t *filenames);
994 /* Get the current filename from 'filenames' as a string.
996 * Note: The returned string belongs to 'filenames' and has a lifetime
997 * identical to it (and the directory to which it ultimately belongs).
1000 notmuch_filenames_get (notmuch_filenames_t *filenames);
1002 /* Advance the 'filenames' iterator to the next filename.
1005 notmuch_filenames_advance (notmuch_filenames_t *filenames);
1007 /* Destroy a notmuch_filenames_t object.
1009 * It's not strictly necessary to call this function. All memory from
1010 * the notmuch_filenames_t object will be reclaimed when the
1011 * containing directory object is destroyed.
1014 notmuch_filenames_destroy (notmuch_filenames_t *filenames);