unofficial mirror of notmuch@notmuchmail.org
 help / color / mirror / code / Atom feed
blob 69bd98a7160fa7fa480d743fe4a947f4acb04821 32634 bytes (raw)
name: lib/notmuch.h 	 # note: path name is non-authoritative(*)

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
 
/* notmuch - Not much of an email library, (just index and search)
 *
 * Copyright © 2009 Carl Worth
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/ .
 *
 * Author: Carl Worth <cworth@cworth.org>
 */

#ifndef NOTMUCH_H
#define NOTMUCH_H

#ifdef  __cplusplus
# define NOTMUCH_BEGIN_DECLS  extern "C" {
# define NOTMUCH_END_DECLS    }
#else
# define NOTMUCH_BEGIN_DECLS
# define NOTMUCH_END_DECLS
#endif

NOTMUCH_BEGIN_DECLS

#include <time.h>

#ifndef FALSE
#define FALSE 0
#endif

#ifndef TRUE
#define TRUE 1
#endif

typedef int notmuch_bool_t;

/* Status codes used for the return values of most functions.
 *
 * A zero value (NOTMUCH_STATUS_SUCCESS) indicates that the function
 * completed without error. Any other value indicates an error as
 * follows:
 *
 * NOTMUCH_STATUS_SUCCESS: No error occurred.
 *
 * NOTMUCH_STATUS_OUT_OF_MEMORY: Out of memory
 *
 * XXX: We don't really want to expose this lame XAPIAN_EXCEPTION
 * value. Instead we should map to things like DATABASE_LOCKED or
 * whatever.
 *
 * NOTMUCH_STATUS_XAPIAN_EXCEPTION: A Xapian exception occurred
 *
 * NOTMUCH_STATUS_FILE_ERROR: An error occurred trying to read or
 *	write to a file (this could be file not found, permission
 *	denied, etc.)
 *
 * NOTMUCH_STATUS_FILE_NOT_EMAIL: A file was presented that doesn't
 *	appear to be an email message.
 *
 * NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID: A file contains a message ID
 *	that is identical to a message already in the database.
 *
 * NOTMUCH_STATUS_NULL_POINTER: The user erroneously passed a NULL
 *	pointer to a notmuch function.
 *
 * 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.
 */
typedef enum _notmuch_status {
    NOTMUCH_STATUS_SUCCESS = 0,
    NOTMUCH_STATUS_OUT_OF_MEMORY,
    NOTMUCH_STATUS_READONLY_DATABASE,
    NOTMUCH_STATUS_XAPIAN_EXCEPTION,
    NOTMUCH_STATUS_FILE_ERROR,
    NOTMUCH_STATUS_FILE_NOT_EMAIL,
    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;

/* Get a string representation of a notmuch_status_t value.
 *
 * The result is readonly.
 */
const char *
notmuch_status_to_string (notmuch_status_t status);

/* Various opaque data types. For each notmuch_<foo>_t see the various
 * notmuch_<foo> functions below. */
typedef struct _notmuch_database notmuch_database_t;
typedef struct _notmuch_query notmuch_query_t;
typedef struct _notmuch_threads notmuch_threads_t;
typedef struct _notmuch_thread notmuch_thread_t;
typedef struct _notmuch_messages notmuch_messages_t;
typedef struct _notmuch_message notmuch_message_t;
typedef struct _notmuch_tags notmuch_tags_t;

/* Create a new, empty notmuch database located at 'path'.
 *
 * The path should be a top-level directory to a collection of
 * plain-text email messages (one message per file). This call will
 * create a new ".notmuch" directory within 'path' where notmuch will
 * store its data.
 *
 * After a successful call to notmuch_database_create, the returned
 * database will be open so the caller should call
 * notmuch_database_close when finished with it.
 *
 * The database will not yet have any data in it
 * (notmuch_database_create itself is a very cheap function). Messages
 * contained within 'path' can be added to the database by calling
 * notmuch_database_add_message.
 *
 * In case of any failure, this function returns NULL, (after printing
 * an error message on stderr).
 */
notmuch_database_t *
notmuch_database_create (const char *path);

typedef enum {
    NOTMUCH_DATABASE_MODE_READ_ONLY = 0,
    NOTMUCH_DATABASE_MODE_READ_WRITE
} notmuch_database_mode_t;

/* XXX: I think I'd like this to take an extra argument of
 * notmuch_status_t* for returning a status value on failure. */

/* Open an existing notmuch database located at 'path'.
 *
 * The database should have been created at some time in the past,
 * (not necessarily by this process), by calling
 * notmuch_database_create with 'path'. By default the database should be
 * opened for reading only. In order to write to the database you need to
 * pass the NOTMUCH_DATABASE_MODE_WRITABLE mode.
 *
 * An existing notmuch database can be identified by the presence of a
 * directory named ".notmuch" below 'path'.
 *
 * The caller should call notmuch_database_close when finished with
 * this database.
 *
 * In case of any failure, this function returns NULL, (after printing
 * an error message on stderr).
 */
notmuch_database_t *
notmuch_database_open (const char *path,
		       notmuch_database_mode_t mode);

/* Close the given notmuch database, freeing all associated
 * resources. See notmuch_database_open. */
void
notmuch_database_close (notmuch_database_t *database);

/* Return the database path of the given database.
 *
 * The return value is a string owned by notmuch so should not be
 * modified nor freed by the caller. */
const char *
notmuch_database_get_path (notmuch_database_t *database);

/* Store a timestamp within the database.
 *
 * The Notmuch database will not interpret this key nor the timestamp
 * values at all. It will merely store them together and return the
 * timestamp when notmuch_database_get_timestamp is called with the
 * same value for 'key'.
 *
 * The intention is for the caller to use the timestamp 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_database_set_timestamp with the path of the
 *     directory as 'key' and the originally read mtime as 'value'.
 *
 * Then, when wanting to check for updates to the directory in the
 * future, the client can call notmuch_database_get_timestamp 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_database_get_timestamp 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: Timestamp successfully stored in database.
 *
 * NOTMUCH_STATUS_XAPIAN_EXCEPTION: A Xapian exception
 *	occurred. Timestamp not stored.
 */
notmuch_status_t
notmuch_database_set_timestamp (notmuch_database_t *database,
				const char *key, time_t timestamp);

/* Retrieve a timestamp from the database.
 *
 * Returns the timestamp value previously stored by calling
 * notmuch_database_set_timestamp with the same value for 'key'.
 *
 * Returns 0 if no timestamp is stored for 'key' or if any error
 * occurred querying the database.
 */
time_t
notmuch_database_get_timestamp (notmuch_database_t *database,
				const char *key);

/* Add a new message to the given notmuch database.
 *
 * Here,'filename' should be a path relative to the path of
 * 'database' (see notmuch_database_get_path), or else should be an
 * absolute filename with initial components that match the path of
 * 'database'.
 *
 * The file should be a single mail message (not a multi-message mbox)
 * that is expected to remain at its current location, (since the
 * notmuch database will 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_DUPLICATE_MESSAGE_ID: Message has the same message
 *	ID as another message already in the database. Nothing added
 *	to the database.
 *
 * NOTMUCH_STATUS_FILE_ERROR: an error occurred trying to open the
 *	file, (such as permission denied, or file not found,
 *	etc.). Nothing added to the database.
 *
 * NOTMUCH_STATUS_FILE_NOT_EMAIL: the contents of filename don't look
 *	like an email message. Nothing added to the database.
 */
notmuch_status_t
notmuch_database_add_message (notmuch_database_t *database,
			      const char *filename,
			      notmuch_message_t **message);

/* Find a message with the given message_id.
 *
 * If the database contains a message with the given message_id, then
 * a new notmuch_message_t object is returned. The caller should call
 * notmuch_message_destroy when done with the message.
 *
 * If no message is found with the given message_id or if an
 * out-of-memory situation occurs, this function returns NULL.
 */
notmuch_message_t *
notmuch_database_find_message (notmuch_database_t *database,
			       const char *message_id);

/* Return a list of all tags found in the database.
 *
 * This function creates a list of all tags found in the database. The
 * resulting list contains all tags from all messages found in the database.
 *
 * On error this function returns NULL.
 */
notmuch_tags_t *
notmuch_database_get_all_tags (notmuch_database_t *db);

/* Create a new query for 'database'.
 *
 * Here, 'database' should be an open database, (see
 * notmuch_database_open and notmuch_database_create).
 *
 * For the query string, we'll document the syntax here more
 * completely in the future, but it's likely to be a specialized
 * version of the general Xapian query syntax:
 *
 * http://xapian.org/docs/queryparser.html
 *
 * As a special case, passing a length-zero string, (that is ""), will
 * result in a query that returns all messages in the database.
 *
 * See notmuch_query_set_sort for controlling the order of results and
 * notmuch_query_search to actually execute the query.
 *
 * User should call notmuch_query_destroy when finished with this
 * query.
 *
 * Will return NULL if insufficient memory is available.
 */
notmuch_query_t *
notmuch_query_create (notmuch_database_t *database,
		      const char *query_string);

/* Sort values for notmuch_query_set_sort */
typedef enum {
    NOTMUCH_SORT_OLDEST_FIRST,
    NOTMUCH_SORT_NEWEST_FIRST,
    NOTMUCH_SORT_MESSAGE_ID
} notmuch_sort_t;

/* Specify the sorting desired for this query. */
void
notmuch_query_set_sort (notmuch_query_t *query, notmuch_sort_t sort);

/* Execute a query for threads, returning a notmuch_threads_t object
 * which can be used to iterate over the results. The returned threads
 * object is owned by the query and as such, will only be valid until
 * notmuch_query_destroy.
 *
 * Typical usage might be:
 *
 *     notmuch_query_t *query;
 *     notmuch_threads_t *threads;
 *     notmuch_thread_t *thread;
 *
 *     query = notmuch_query_create (database, query_string);
 *
 *     for (threads = notmuch_query_search_threads (query);
 *          notmuch_threads_has_more (threads);
 *          notmuch_threads_advance (threads))
 *     {
 *         thread = notmuch_threads_get (threads);
 *         ....
 *         notmuch_thread_destroy (thread);
 *     }
 *
 *     notmuch_query_destroy (query);
 *
 * Note: If you are finished with a thread before its containing
 * query, you can call notmuch_thread_destroy to clean up some memory
 * sooner (as in the above example). Otherwise, if your thread objects
 * are long-lived, then you don't need to call notmuch_thread_destroy
 * and all the memory will still be reclaimed when the query is
 * destroyed.
 *
 * Note that there's no explicit destructor needed for the
 * notmuch_threads_t object. (For consistency, we do provide a
 * notmuch_threads_destroy function, but there's no good reason
 * to call it if the query is about to be destroyed).
 */
notmuch_threads_t *
notmuch_query_search_threads (notmuch_query_t *query);

/* Execute a query for messages, returning a notmuch_messages_t object
 * which can be used to iterate over the results. The returned
 * messages object is owned by the query and as such, will only be
 * valid until notmuch_query_destroy.
 *
 * Typical usage might be:
 *
 *     notmuch_query_t *query;
 *     notmuch_messages_t *messages;
 *     notmuch_message_t *message;
 *
 *     query = notmuch_query_create (database, query_string);
 *
 *     for (messages = notmuch_query_search_messages (query);
 *          notmuch_messages_has_more (messages);
 *          notmuch_messages_advance (messages))
 *     {
 *         message = notmuch_messages_get (messages);
 *         ....
 *         notmuch_message_destroy (message);
 *     }
 *
 *     notmuch_query_destroy (query);
 *
 * Note: If you are finished with a message before its containing
 * query, you can call notmuch_message_destroy to clean up some memory
 * sooner (as in the above example). Otherwise, if your message
 * objects are long-lived, then you don't need to call
 * notmuch_message_destroy and all the memory will still be reclaimed
 * when the query is destroyed.
 *
 * Note that there's no explicit destructor needed for the
 * notmuch_messages_t object. (For consistency, we do provide a
 * notmuch_messages_destroy function, but there's no good
 * reason to call it if the query is about to be destroyed).
 */
notmuch_messages_t *
notmuch_query_search_messages (notmuch_query_t *query);

/* Destroy a notmuch_query_t along with any associated resources.
 *
 * This will in turn destroy any notmuch_threads_t and
 * notmuch_messages_t objects generated by this query, (and in
 * turn any notmuch_thrad_t and notmuch_message_t objects generated
 * from those results, etc.), if such objects haven't already been
 * destroyed.
 */
void
notmuch_query_destroy (notmuch_query_t *query);

/* Does the given notmuch_threads_t object contain any more
 * results.
 *
 * When this function returns TRUE, notmuch_threads_get will
 * return a valid object. Whereas when this function returns FALSE,
 * notmuch_threads_get will return NULL.
 *
 * See the documentation of notmuch_query_search_threads for example
 * code showing how to iterate over a notmuch_threads_t object.
 */
notmuch_bool_t
notmuch_threads_has_more (notmuch_threads_t *threads);

/* Get the current thread from 'threads' as a notmuch_thread_t.
 *
 * Note: The returned thread belongs to 'threads' and has a lifetime
 * identical to it (and the query to which it belongs).
 *
 * See the documentation of notmuch_query_search_threads for example
 * code showing how to iterate over a notmuch_threads_t object.
 *
 * If an out-of-memory situation occurs, this function will return
 * NULL.
 */
notmuch_thread_t *
notmuch_threads_get (notmuch_threads_t *threads);

/* Advance the 'threads' iterator to the next thread.
 *
 * See the documentation of notmuch_query_search_threads for example
 * code showing how to iterate over a notmuch_threads_t object.
 */
void
notmuch_threads_advance (notmuch_threads_t *threads);

/* Destroy a notmuch_threads_t object.
 *
 * It's not strictly necessary to call this function. All memory from
 * the notmuch_threads_t object will be reclaimed when the
 * containg query object is destroyed.
 */
void
notmuch_threads_destroy (notmuch_threads_t *threads);

/* Return an estimate of the number of messages matching a search
 *
 * This function performs a search and returns Xapian's best
 * guess as to number of matching messages.
 */
unsigned
notmuch_query_count_messages (notmuch_query_t *query);
 
/* Get the thread ID of '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_thread_id (notmuch_thread_t *thread);

/* Get the total number of messages in 'thread'.
 *
 * This count consists of all messages in the database belonging to
 * this thread. Contrast with notmuch_thread_get_matched_messages() .
 */
int
notmuch_thread_get_total_messages (notmuch_thread_t *thread);

/* Get a notmuch_messages_t iterator for the top-level messages in
 * 'thread'.
 *
 * This iterator will not necessarily iterate over all of the messages
 * in the thread. It will only iterate over the messages in the thread
 * which are not replies to other messages in the thread.
 *
 * To iterate over all messages in the thread, the caller will need to
 * iterate over the result of notmuch_message_get_replies for each
 * top-level message (and do that recursively for the resulting
 * messages, etc.).
 */
notmuch_messages_t *
notmuch_thread_get_toplevel_messages (notmuch_thread_t *thread);

/* Get the number of messages in 'thread' that matched the search.
 *
 * This count includes only the messages in this thread that were
 * matched by the search from which the thread was created. Contrast
 * with notmuch_thread_get_total_messages() .
 */
int
notmuch_thread_get_matched_messages (notmuch_thread_t *thread);

/* Get the authors of 'thread'
 *
 * The returned string is a comma-separated list of the names of the
 * authors of mail messages in the query results that belong 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_authors (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 date of the oldest message in 'thread' as a time_t value.
 */
time_t
notmuch_thread_get_oldest_date (notmuch_thread_t *thread);

/* Get the date of the oldest message in 'thread' as a time_t value.
 */
time_t
notmuch_thread_get_newest_date (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_threads_get (threads);
 *
 *     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);

/* Does the given notmuch_messages_t object contain any more
 * messages.
 *
 * When this function returns TRUE, notmuch_messages_get will return a
 * valid object. Whereas when this function returns FALSE,
 * notmuch_messages_get will return NULL.
 *
 * See the documentation of notmuch_query_search_messages for example
 * code showing how to iterate over a notmuch_messages_t object.
 */
notmuch_bool_t
notmuch_messages_has_more (notmuch_messages_t *messages);

/* Is the given notmuch_messages_t object on the first message */
notmuch_bool_t
notmuch_messages_is_first (notmuch_messages_t *messages);

/* Get the current message from 'messages' as a notmuch_message_t.
 *
 * Note: The returned message belongs to 'messages' and has a lifetime
 * identical to it (and the query to which it belongs).
 *
 * See the documentation of notmuch_query_search_messages for example
 * code showing how to iterate over a notmuch_messages_t object.
 *
 * If an out-of-memory situation occurs, this function will return
 * NULL.
 */
notmuch_message_t *
notmuch_messages_get (notmuch_messages_t *messages);

/* Advance the 'messages' iterator to the next result.
 *
 * See the documentation of notmuch_query_search_messages for example
 * code showing how to iterate over a notmuch_messages_t object.
 */
void
notmuch_messages_advance (notmuch_messages_t *messages);

/* Regress the 'messages' iterator to the previous result. */
void
notmuch_messages_regress (notmuch_messages_t *messages);

/* Destroy a notmuch_messages_t object.
 *
 * It's not strictly necessary to call this function. All memory from
 * the notmuch_messages_t object will be reclaimed when the containing
 * query object is destroyed.
 */
void
notmuch_messages_destroy (notmuch_messages_t *messages);

/* Return a list of tags from all messages.
 *
 * The resulting list is guaranteed not to contain duplicated tags.
 *
 * WARNING: You can no longer iterate over messages after calling this
 * function, because the iterator will point at the end of the list.
 * We do not have a function to reset the iterator yet and the only
 * way how you can iterate over the list again is to recreate the
 * message list.
 *
 * The function returns NULL on error.
 */
notmuch_tags_t *
notmuch_messages_collect_tags (notmuch_messages_t *messages);

/* Get the message ID of 'message'.
 *
 * The returned string belongs to 'message' and as such, should not be
 * modified by the caller and will only be valid for as long as the
 * message is valid, (which is until the query from which it derived
 * is destroyed).
 *
 * This function will not return NULL since Notmuch ensures that every
 * message has a unique message ID, (Notmuch will generate an ID for a
 * message if the original file does not contain one).
 */
const char *
notmuch_message_get_message_id (notmuch_message_t *message);

/* Get the thread ID of 'message'.
 *
 * The returned string belongs to 'message' and as such, should not be
 * modified by the caller and will only be valid for as long as the
 * message is valid, (for example, until the user calls
 * notmuch_message_destroy on 'message' or until a query from which it
 * derived is destroyed).
 *
 * This function will not return NULL since Notmuch ensures that every
 * message belongs to a single thread.
 */
const char *
notmuch_message_get_thread_id (notmuch_message_t *message);

/* Get a notmuch_messages_t iterator for all of the replies to
 * 'message'.
 *
 * Note: This call only makes sense if 'message' was ultimately
 * obtained from a notmuch_thread_t object, (such as by coming
 * directly from the result of calling notmuch_thread_get_
 * toplevel_messages or by any number of subsequent
 * calls to notmuch_message_get_replies).
 *
 * If 'message' was obtained through some non-thread means, (such as
 * by a call to notmuch_query_search_messages), then this function
 * will return NULL.
 *
 * If there are no replies to 'message', this function will return
 * NULL. (Note that notmuch_messages_has_more will accept that NULL
 * value as legitimate, and simply return FALSE for it.)
 */
notmuch_messages_t *
notmuch_message_get_replies (notmuch_message_t *message);

/* Get the filename for the email corresponding to 'message'.
 *
 * The returned filename is an absolute filename, (the initial
 * component will match notmuch_database_get_path() ).
 *
 * The returned string belongs to the message so should not be
 * modified or freed by the caller (nor should it be referenced after
 * the message is destroyed). */
const char *
notmuch_message_get_filename (notmuch_message_t *message);

/* Message flags */
typedef enum _notmuch_message_flag {
    NOTMUCH_MESSAGE_FLAG_MATCH,
} notmuch_message_flag_t;

/* Get a value of a flag for the email corresponding to 'message'. */
notmuch_bool_t
notmuch_message_get_flag (notmuch_message_t *message,
			  notmuch_message_flag_t flag);

/* Set a value of a flag for the email corresponding to 'message'. */
void
notmuch_message_set_flag (notmuch_message_t *message,
			  notmuch_message_flag_t flag, notmuch_bool_t value);

/* Get the date of 'message' as a time_t value.
 *
 * For the original textual representation of the Date header from the
 * message call notmuch_message_get_header() with a header value of
 * "date". */
time_t
notmuch_message_get_date  (notmuch_message_t *message);

/* Get the value of the specified header from 'message'.
 *
 * The value will be read from the actual message file, not from the
 * notmuch database. The header name is case insensitive.
 *
 * The returned string belongs to the message so should not be
 * modified or freed by the caller (nor should it be referenced after
 * the message is destroyed).
 *
 * Returns an empty string ("") if the message does not contain a
 * header line matching 'header'. Returns NULL if any error occurs.
 */
const char *
notmuch_message_get_header (notmuch_message_t *message, const char *header);

/* Get the tags for 'message', returning a notmuch_tags_t object which
 * can be used to iterate over all tags.
 *
 * The tags object is owned by the message and as such, will only be
 * valid for as long as the message is valid, (which is until the
 * query from which it derived is destroyed).
 *
 * Typical usage might be:
 *
 *     notmuch_message_t *message;
 *     notmuch_tags_t *tags;
 *     const char *tag;
 *
 *     message = notmuch_database_find_message (database, message_id);
 *
 *     for (tags = notmuch_message_get_tags (message);
 *          notmuch_tags_has_more (tags);
 *          notmuch_result_advance (tags))
 *     {
 *         tag = notmuch_tags_get (tags);
 *         ....
 *     }
 *
 *     notmuch_message_destroy (message);
 *
 * 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_message_get_tags (notmuch_message_t *message);

/* The longest possible tag value. */
#define NOTMUCH_TAG_MAX 200

/* Add a tag to the given message.
 *
 * Return value:
 *
 * NOTMUCH_STATUS_SUCCESS: Tag successfully added to message
 *
 * NOTMUCH_STATUS_NULL_POINTER: The 'tag' argument is NULL
 *
 * 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);

/* Remove a tag from the given message.
 *
 * Return value:
 *
 * 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 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
 * query object with many messages in the result, (such as iterating
 * over the entire database). Otherwise, it's fine to never call this
 * function and there will still be no memory leaks. (The memory from
 * the messages get reclaimed when the containing query is destroyed.)
 */
void
notmuch_message_destroy (notmuch_message_t *message);

/* Does the given notmuch_tags_t object contain any more tags.
 *
 * When this function returns TRUE, notmuch_tags_get will return a
 * valid string. Whereas when this function returns FALSE,
 * notmuch_tags_get will return NULL.
 *
 * See the documentation of notmuch_message_get_tags for example code
 * showing how to iterate over a notmuch_tags_t object.
 */
notmuch_bool_t
notmuch_tags_has_more (notmuch_tags_t *tags);

/* Get the current tag from 'tags' as a string.
 *
 * Note: The returned string belongs to 'tags' and has a lifetime
 * identical to it (and the query to which it ultimately belongs).
 *
 * See the documentation of notmuch_message_get_tags for example code
 * showing how to iterate over a notmuch_tags_t object.
 */
const char *
notmuch_tags_get (notmuch_tags_t *tags);

/* Advance the 'tags' iterator to the next tag.
 *
 * See the documentation of notmuch_message_get_tags for example code
 * showing how to iterate over a notmuch_tags_t object.
 */
void
notmuch_tags_advance (notmuch_tags_t *tags);

/* Destroy a notmuch_tags_t object.
 *
 * It's not strictly necessary to call this function. All memory from
 * the notmuch_tags_t object will be reclaimed when the containing
 * message or query objects are destroyed.
 */
void
notmuch_tags_destroy (notmuch_tags_t *tags);

NOTMUCH_END_DECLS

#endif

debug log:

solving 69bd98a ...
found 69bd98a in https://yhetil.org/notmuch/1260265292-12591-3-git-send-email-meskio@sindominio.net/
found 60834fb in https://yhetil.org/notmuch.git/
preparing index
index prepared:
100644 60834fb50bb687da9d097ed5b41c15f394554854	lib/notmuch.h

applying [1/1] https://yhetil.org/notmuch/1260265292-12591-3-git-send-email-meskio@sindominio.net/
diff --git a/lib/notmuch.h b/lib/notmuch.h
index 60834fb..69bd98a 100644

Checking patch lib/notmuch.h...
Applied patch lib/notmuch.h cleanly.

index at:
100644 69bd98a7160fa7fa480d743fe4a947f4acb04821	lib/notmuch.h

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this public inbox

	https://yhetil.org/notmuch.git/

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).