summaryrefslogtreecommitdiff
path: root/lisp/gnus/nnmairix.el
blob: b3329212f84978723ff9aff3880436cf8c05a625 (plain)
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
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
;;; nnmairix.el --- Mairix back end for Gnus, the Emacs newsreader

;; Copyright (C) 2007-2020 Free Software Foundation, Inc.

;; Author: David Engster <deng@randomsample.de>
;; Keywords: mail searching
;; Old-Version: 0.6

;; This file is part of GNU Emacs.

;; GNU Emacs 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.

;; GNU Emacs 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 GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; This is a back end for using the mairix search engine with
;; Gnus.  Mairix is a tool for searching words in locally stored
;; mail.  Mairix is very fast which allows using it efficiently for
;; "smart folders", e.g. folders which are associated with search
;; queries.  Of course, you can also use this back end just for
;; calling mairix with some search query.
;;
;; Mairix is written by Richard Curnow.  More information can be found at
;; http://www.rpcurnow.force9.co.uk/mairix/

;; Commentary on the code: nnmairix sits between Gnus and the "real"
;; back end which handles the mail (currently nnml, nnimap and
;; nnmaildir were tested). I know this is all a bit hacky, but so far
;; it works for me.  This is the first back end I've written for Gnus,
;; so I'd appreciate any comments, suggestions, bug reports (and, of
;; course, patches) for improving nnmairix.

;; nnmairix does not use an active file, since I wanted to contain the
;; back end "inside Gnus" as much as possible without the need of an
;; external file.  It stores the query/folder information in the group
;; parameters instead.  This also implies that once you kill a mairix
;; group, it's gone for good.  I don't think that this is really
;; problematic, since I don't see the need in unsubscribing and
;; re-subscribing search groups

;; Every mairix server is "responsible" for one mairix installation,
;; i.e. you can have several mairix servers for different mairix
;; configurations.  Not that I think anyone will actually do this, but
;; I thought it would be a "nice to have feature"...

;; KNOWN BUGS:
;; * Mairix does only support us-ascii characters.

;; TODO/MISSING FEATURES:
;; * Support of more back ends (nnmh, nnfolder, nnmbox...)?
;; * Maybe use an active file instead of group parameters?
;; * Maybe use "-a" when updating groups which are not newly created?

;;; Changelog:
;; 05/30/2008 - version 0.6
;;
;;    * It is now possible to propagate marks from the nnmairix groups
;;      to the original messages (and for maildir also vice versa). See
;;      the docs for details on this feature - it's pretty delicate
;;      and currently needs a patched mairix binary to work smoothly.
;;
;;    * Keep messages in nnmairix groups always read/unread
;;      (bound to 'G b r').
;;
;;    * Recreate back end folder for nnmairix groups in case you
;;      somehow get wrong article counts (bound to 'G b d').
;;
;;    * New group parameter 'allow-fast'. Toggling of parameter bound
;;      to 'G b a'. The default is nil, meaning that the group will
;;      always be updated with a mairix search, even when only entered.
;;
;;    * More/Better use of the registry (if available). Can now also
;;      deal with duplicate messages in different groups.
;;
;; 02/06/2008 - version 0.5
;;
;;    * New function: nnmairix-goto-original-article. Uses the
;;      registry or the mail file path for determining original group.
;;
;;    * Deal with empty Xref header
;;
;;    * Changed summary mode keybindings since the old ones were
;;      already taken
;;
;;   (Thanks to Tassilo Horn and Ted Zlatanov for their help)
;;
;; 01/07/2008 - version 0.4
;;
;;    * New/fixed doc strings and code cleanup.
;;
;; 11/18/2007 - version 0.3
;;
;;    * Fixed bugs when dealing with nnml and native servers
;;
;;    * Make variables customizable
;;
;; 10/10/2007 - version 0.2
;;
;;    * Use nnml-directory/directory server variables for nnml and
;;    nnmaildir back ends as path for search folders. This way it
;;    becomes independent of 'base' setting in .mairixirc (but not for
;;    nnimap).
;;
;;    * As a result: Changed nnmairix-backend-to-server so that user
;;    is asked when more than one nnmairix server exists and we do not
;;    know which one is responsible for current back end.
;;
;;    * Rename files when using nnml back ends so that there are no
;;    holes in article numbers. This should fix all problems regarding
;;    wrong article counts with nnml.
;;
;;    * More commands for creating queries (using widgets or the
;;    minibuffer).
;;
;;    * Fixed bug in nnmairix-create-search-group-from-message
;;
;;    * Changed copyright to FSF
;;
;;      (Thanks to Georg C. F. Greve and Bastien for suggestions and
;;      ideas!)
;;
;; 10/03/2007 - version 0.1 - first release


;;; Code:

(require 'nnoo)
(require 'gnus-group)
(require 'gnus-sum)
(require 'message)
(require 'nnml)
(require 'widget)

(nnoo-declare nnmairix)

;;; === Keymaps

;; Group mode
(defun nnmairix-group-mode-hook ()
  "Nnmairix group mode keymap."
  (define-key gnus-group-mode-map
    (kbd "G b") (make-sparse-keymap))
  (define-key gnus-group-mode-map
    (kbd "G b g") 'nnmairix-create-search-group)
  (define-key gnus-group-mode-map
    (kbd "G b c") 'nnmairix-create-server-and-default-group)
  (define-key gnus-group-mode-map
    (kbd "G b q") 'nnmairix-group-change-query-this-group)
  (define-key gnus-group-mode-map
    (kbd "G b t") 'nnmairix-group-toggle-threads-this-group)
  (define-key gnus-group-mode-map
    (kbd "G b u") 'nnmairix-update-database)
  (define-key gnus-group-mode-map
    (kbd "G b s") 'nnmairix-search)
  (define-key gnus-group-mode-map
    (kbd "G b i") 'nnmairix-search-interactive)
  (define-key gnus-group-mode-map
    (kbd "G b m") 'nnmairix-widget-search)
  (define-key gnus-group-mode-map
    (kbd "G b p") 'nnmairix-group-toggle-propmarks-this-group)
  (define-key gnus-group-mode-map
    (kbd "G b r") 'nnmairix-group-toggle-readmarks-this-group)
  (define-key gnus-group-mode-map
    (kbd "G b d") 'nnmairix-group-delete-recreate-this-group)
  (define-key gnus-group-mode-map
    (kbd "G b a") 'nnmairix-group-toggle-allowfast-this-group)
  (define-key gnus-group-mode-map
    (kbd "G b o") 'nnmairix-propagate-marks))

;; Summary mode
(defun nnmairix-summary-mode-hook ()
  "Nnmairix summary mode keymap."
  (define-key gnus-summary-mode-map
    (kbd "G G t") 'nnmairix-search-thread-this-article)
  (define-key gnus-summary-mode-map
    (kbd "G G f") 'nnmairix-search-from-this-article)
  (define-key gnus-summary-mode-map
    (kbd "G G m") 'nnmairix-widget-search-from-this-article)
  (define-key gnus-summary-mode-map
    (kbd "G G g") 'nnmairix-create-search-group-from-message)
  (define-key gnus-summary-mode-map
    (kbd "G G o") 'nnmairix-goto-original-article)
  (define-key gnus-summary-mode-map
    (kbd "G G u") 'nnmairix-remove-tick-mark-original-article))

(add-hook 'gnus-group-mode-hook 'nnmairix-group-mode-hook)
(add-hook 'gnus-summary-mode-hook 'nnmairix-summary-mode-hook)

;; ;;;###autoload
;; (defun nnmairix-initialize (&optional force)
;;   (interactive "P")
;;   (if (not (or (file-readable-p "~/.mairixrc")
;; 	       force))
;;       (message "No file `~/.mairixrc', skipping nnmairix setup")
;;     (add-hook 'gnus-group-mode-hook 'nnmairix-group-mode-hook)
;;     (add-hook 'gnus-summary-mode-hook 'nnmairix-summary-mode-hook)))

;; Customizable stuff

(defgroup nnmairix nil
  "Back end for the Mairix mail search engine."
  :group 'gnus)

(defcustom nnmairix-group-prefix "zz_mairix"
  "Prefix for mairix search groups on back end server.
nnmairix will create these groups automatically on the back end
server for each nnmairix search group.  The name on the back end
server will be this prefix plus a random number.  You can delete
unused nnmairix groups on the back end using
`nnmairix-purge-old-groups'."
  :version "23.1"
  :type 'string
  :group 'nnmairix)

(defcustom nnmairix-mairix-output-buffer "*mairix output*"
  "Buffer used for mairix output."
  :version "23.1"
  :type 'string
  :group 'nnmairix)

(defcustom nnmairix-customize-query-buffer "*mairix query*"
  "Name of the buffer for customizing Mairix queries."
  :version "23.1"
  :type 'string
  :group 'nnmairix)

(defcustom nnmairix-mairix-update-options '("-F" "-Q")
  "Options when calling mairix for updating the database.
The default is \"-F\" and \"-Q\" for making updates faster.  You
should call mairix without these options from time to
time (e.g. via cron job)."
  :version "23.1"
  :type '(repeat string)
  :group 'nnmairix)

(defcustom nnmairix-mairix-search-options '("-Q")
  "Options when calling mairix for searching.
The default is \"-Q\" for making searching faster."
  :version "23.1"
  :type '(repeat string)
  :group 'nnmairix)

(defcustom nnmairix-mairix-synchronous-update nil
  "Set this to t if you want Emacs to wait for mairix updating the database."
  :version "23.1"
  :type 'boolean
  :group 'nnmairix)

(defcustom nnmairix-rename-files-for-nnml t
  "Rename nnml mail files so that they are consecutively numbered.
When using nnml as back end, mairix might produce holes in the
article numbers which will produce wrong article counts by
Gnus.  This option controls whether nnmairix should rename the
files consecutively."
  :version "23.1"
  :type 'boolean
  :group 'nnmairix)

(defcustom nnmairix-widget-fields-list
  '(("from" "f" "From") ("to" "t" "To") ("cc" "c" "Cc")
    ("subject" "s" "Subject")  ("to" "tc" "To or Cc")
    ("from" "a" "Address") (nil "b" "Body") (nil "n" "Attachment")
    ("Message-ID" "m" "Message ID") (nil "s" "Size") (nil "d" "Date"))
  "Fields that should be editable during interactive query customization.

Header, corresponding mairix command and description for editable
fields in interactive query customization.  The header specifies
which header contents should be inserted into the editable field
when creating a Mairix query based on the current message (can be
nil for disabling this)."
  :version "23.1"
  :type '(repeat (list
		  (choice :tag "Field"
			  (const :tag "none" nil)
			  (const :tag "From" "from")
			  (const :tag "To" "to")
			  (const :tag "Cc" "cc")
			  (const :tag "Subject" "subject")
			  (const :tag "Message ID" "Message-ID"))
		  (string :tag "Command")
		  (string :tag "Description")))
  :group 'nnmairix)

(defcustom nnmairix-widget-select-window-function
  (lambda () (select-window (get-largest-window)))
  "Function for selecting the window for customizing the mairix query.
The default chooses the largest window in the current frame."
  :version "23.1"
  :type 'function
  :group 'nnmairix)

(defcustom nnmairix-propagate-marks-upon-close t
  "Flag if marks should be propagated upon closing a group.
The default of this variable is t.  If set to `ask', the
user will be asked if the flags should be propagated when the
group is closed.  If set to nil, the user will have to manually
call `nnmairix-propagate-marks'."
  :version "23.1"
  :type '(choice (const :tag "always" t)
		 (const :tag "ask" ask)
		 (const :tag "never" nil))
  :group 'nnmairix)

(defcustom nnmairix-propagate-marks-to-nnmairix-groups nil
  "Flag if marks from original articles should be seen in nnmairix groups.
The default is nil since it will only work if the articles are in
maildir format and NOT managed by the nnmaildir back end but
e.g. an IMAP server (which stores the marks in the maildir file
name).  You may safely set this to t for testing - the worst that
can happen are wrong marks in nnmairix groups."
  :version "23.1"
  :type 'boolean
  :group 'nnmairix)

(defcustom nnmairix-only-use-registry nil
  "Use only the registry for determining original group(s).
If set to t, nnmairix will only use the registry for determining
the original group(s) of an article (which is also necessary for
propagating marks).  If set to nil, it will also try to determine
the group from an additional mairix search which might be slow
when propagating lots of marks."
  :version "23.1"
  :type 'boolean
  :group 'nnmairix)

(defcustom nnmairix-allowfast-default nil
  "Whether fast entering should be the default for nnmairix groups.
You may set this to t to make entering the group faster, but note that
this might lead to problems, especially when used with marks propagation."
  :version "23.1"
  :type 'boolean
  :group 'nnmairix)

;; ==== Other variables

(defvar nnmairix-widget-other
  '(threads flags)
  "Other editable mairix commands when using customization widgets.
Currently there are 'threads and 'flags.")

(defvar nnmairix-interactive-query-parameters
  '((?f "from" "f" "From") (?t "to" "t" "To") (?c "to" "tc" "To or Cc")
    (?a "from" "a" "Address") (?s "subject" "s" "Subject") (?b nil "b" "Body")
    (?d nil "d" "Date") (?n nil "n" "Attachment"))
  "Things that should be editable during interactive query generation.
Every list element consists of the following entries: Keystroke,
message field (if any), mairix command and description.")

(defvar nnmairix-delete-and-create-on-change '(nnimap nnmaildir nnml)
  "Controls on which back ends groups should be deleted and re-created.
This variable is a list of back ends where the search group
should be completely deleted and re-created when the query or
thread parameter changes.  The default is to this for all
currently supported back ends.  It usually also corrects the
problem of \"holes\" in the article numbers which often lead to a
wrong count of total articles shown by Gnus.")

;;; === Server variables

(defvoo nnmairix-backend  nil
  "Back end where mairix stores its searches.")

(defvoo nnmairix-backend-server nil
  "Name of the server where mairix stores its searches.")

(defvoo nnmairix-mairix-command "mairix"
  "Command to call mairix for this nnmairix server.")

(defvoo nnmairix-hidden-folders nil
  "Set this to t if the back end server uses hidden directories for
its maildir mail folders (e.g. the Dovecot IMAP server or mutt).")

(defvoo nnmairix-default-group nil
  "Default search group.  This is the group which is used for all
temporary searches, e.g. nnmairix-search.")

;;; === Internal variables

(defconst nnmairix-group-regexp
  (format "%s-\\(.*\\)-[0-9]+" nnmairix-group-prefix)
  "Regexp for mairix groups on back end.")

(defconst nnmairix-valid-backends '(nnimap nnml nnmaildir)
  "Back ends supported by nnmairix.
Other back ends might or might not work.")

(defvar nnmairix-last-server nil
  "Last chosen server.")

(defvar nnmairix-current-server nil
  "Current server.")

(defvar nnmairix-marks-cache nil
  "Cache for marks which should be set upon closing current group.")

(defvar nnmairix-version-output nil
  "Version string of mairix binary.")

;;; === Gnus back end functions

(nnoo-define-basics nnmairix)

(gnus-declare-backend "nnmairix" 'mail 'address 'virtual)

(deffoo nnmairix-open-server (server &optional definitions)
  ;; just set server variables
  (setq nnmairix-current-server server)
  (nnoo-change-server 'nnmairix server definitions))

(deffoo nnmairix-request-group (group &optional server fast info)
  ;; Call mairix and request group on back end server
  (when server (nnmairix-open-server server))
  (let* ((qualgroup (if server
			(gnus-group-prefixed-name group (list 'nnmairix server))
		      group))
	 (folder (gnus-group-get-parameter qualgroup 'folder))
	 (allowfast (gnus-group-get-parameter qualgroup 'allow-fast))
	 (query (gnus-group-get-parameter qualgroup 'query t))
	 (threads (gnus-group-get-parameter qualgroup 'threads))
	 (backendmethod (gnus-server-to-method
			 (format "%s:%s" (symbol-name nnmairix-backend)
				 nnmairix-backend-server)))
	 rval mfolder folderpath args)
    (cond
     ((not folder)
      ;; No folder parameter -> error
      (nnheader-report 'nnmairix "Check folder parameter for group %s" group)
      nil)
     ((not query)
      ;; No query -> return empty group
      (with-current-buffer nntp-server-buffer
	(erase-buffer)
	(insert (concat "211 0 1 0 " group))
	t))
     (t
      ;; For maildir++ folders: create a hidden directory (prepend dot)
      (setq mfolder (if (and nnmairix-hidden-folders
			     (not (string-match "^\\." folder)))
			(concat "." folder)
		      folder))
      ;; For nnml and nnmaildir, precede mfolder with directory where mail
      ;; is actually stored so that it's independent of 'base' setting
      ;; in .mairixrc.
      (when (eq nnmairix-backend 'nnml)
	(setq folderpath (cadr (assoc 'nnml-directory backendmethod)))
	;; if nnml-directory is not explicitly set, use global value
	(when (not folderpath)
	  (setq folderpath nnml-directory)))
      (when (eq nnmairix-backend 'nnmaildir)
	(setq folderpath
	      (cadr (assoc 'directory backendmethod))))
      (when folderpath
	(setq mfolder
	      (concat
	       (file-name-as-directory
		(expand-file-name
		 folderpath))
	       mfolder)))
      ;; If (not fast), call Mairix binary
      ;; recreate underlying folder on the back end
      (setq rval
	    (if (and fast allowfast)
		0
	      (nnmairix-call-mairix-binary
	       (split-string nnmairix-mairix-command)
	       mfolder query threads)))
      ;; Check return value
      (cond
       ((zerop rval)			; call was successful
	(nnmairix-call-backend
	 "open-server" nnmairix-backend-server)
	;; If we're dealing with nnml, rename files
	;; consecutively and make new active file for this
	;; group
	(when (eq nnmairix-backend 'nnml)
	  (when nnmairix-rename-files-for-nnml
	    (nnmairix-rename-files-consecutively mfolder))
	  (nnml-generate-nov-databases-directory mfolder nil t))
	(nnmairix-call-backend
	 "request-scan" folder nnmairix-backend-server)
	(if (and fast allowfast)
	    t
	  (nnmairix-request-group-with-article-number-correction
	   folder qualgroup)))
       ((and (= rval 1)
	     (with-current-buffer nnmairix-mairix-output-buffer
	       (goto-char (point-min))
	       (looking-at "^Matched 0 messages")))
	;; No messages found -> return empty group
	(nnheader-message 5 "Mairix: No matches found.")
	(set-buffer nntp-server-buffer)
	(erase-buffer)
	(insert (concat "211 0 1 0 " group))
	t)
       ;; Everything else is an error
       (t
	(nnheader-report
	 'nnmairix "Error running mairix. See buffer %s for details"
	 nnmairix-mairix-output-buffer)
	nil))))))


(deffoo nnmairix-request-create-group (group &optional server args)
  (let ((qualgroup (if server (gnus-group-prefixed-name group (list 'nnmairix server))
		     group))
	(exist t)
	(count 0)
	groupname info)
    (when server (nnmairix-open-server server))
    (gnus-group-add-parameter qualgroup '(query . nil))
    (gnus-group-add-parameter qualgroup '(threads . nil))
    (while exist
      (setq count (1+ count))
      (setq groupname (format "%s-%s-%s" nnmairix-group-prefix group
			      (number-to-string count)))
      (setq exist (nnmairix-call-backend
		   "request-group" groupname nnmairix-backend-server)))
    (nnmairix-call-backend
     "request-create-group" groupname nnmairix-backend-server)
    (gnus-group-add-parameter qualgroup '(folder . nil))
    (when nnmairix-allowfast-default
      (gnus-group-add-parameter qualgroup '(allow-fast . t)))
    (gnus-group-set-parameter qualgroup 'folder groupname))
  t)


(deffoo nnmairix-retrieve-headers (articles group &optional server fetch-old)
  (when server (nnmairix-open-server server))
  (let* ((folder (nnmairix-get-backend-folder group server))
	 (corr (nnmairix-get-numcorr group server))
	 (numcorr 0)
	 rval)
    (when (and corr
	       (not (zerop (cadr corr)))
	       (numberp (car articles)))
      (setq numcorr (cadr corr))
      (setq articles
	    (mapcar
	     (lambda (arg) (- arg numcorr))
	     articles)))
    (setq rval
	  (if (eq nnmairix-backend 'nnimap)
	      (let ((gnus-nov-is-evil t))
		(nnmairix-call-backend
		 "retrieve-headers" articles folder nnmairix-backend-server fetch-old))
	    (nnmairix-call-backend
	     "retrieve-headers" articles folder nnmairix-backend-server fetch-old)))
    (nnmairix-replace-group-and-numbers articles folder group numcorr rval)
    rval))

(deffoo nnmairix-request-article (article &optional group server to-buffer)
  (when server (nnmairix-open-server server))
  (let ((folder (nnmairix-get-backend-folder group server))
	(corr (nnmairix-get-numcorr group server)))
    (when (and
	   (numberp article)
	   corr
	   (not (zerop (cadr corr))))
      (setq article (- article (cadr corr))))
    (nnmairix-call-backend
     "request-article" article folder nnmairix-backend-server to-buffer))
  t)

(deffoo nnmairix-request-list (&optional server)
  (when server (nnmairix-open-server server))
  (if (nnmairix-call-backend "request-list" nnmairix-backend-server)
      (let (cpoint cur qualgroup folder)
	(with-current-buffer nntp-server-buffer
	  (goto-char (point-min))
	  (setq cpoint (point))
	  (while (re-search-forward nnmairix-group-regexp (point-max) t)
	    (setq cur (match-string 1)
		  qualgroup (gnus-group-prefixed-name cur
						      (list 'nnmairix server)))
	    (if (and (gnus-group-entry qualgroup)
		     (string= (match-string 0)
			      (gnus-group-get-parameter qualgroup 'folder)))
		(progn
		  (replace-match cur)
		  (delete-region cpoint (point-at-bol))
		  (forward-line)
		  (setq cpoint (point)))
	      (forward-line)))
	  (delete-region cpoint (point-max)))
	t)
    nil))

;; Silence byte-compiler.
(autoload 'gnus-registry-get-id-key "gnus-registry")

(deffoo nnmairix-request-set-mark (group actions &optional server)
  (when server
    (nnmairix-open-server server))
  (let* ((qualgroup (gnus-group-prefixed-name group (list 'nnmairix nnmairix-current-server)))
	 (propmarks (gnus-group-get-parameter qualgroup 'propmarks))
	 (propto (gnus-group-get-parameter qualgroup 'propto t))
	 (corr (nnmairix-get-numcorr group server))
	 (folder (nnmairix-get-backend-folder group server)))
    (save-excursion
      (dolist (cur actions)
	(let ((type (nth 1 cur))
	      (cmdmarks (nth 2 cur))
	      (range (gnus-uncompress-range (nth 0 cur)))
	      mid ogroup number method temp)
	  (when (and corr
		     (not (zerop (cadr corr))))
	    (setq range (mapcar (lambda (arg)
				  (- arg (cadr corr)))
				range)))
	  (when propmarks
	    (nnheader-message 7 "nnmairix: Setting marks...")
	      (dolist (article range)
		;; get article (header) and extract message id
		;; we try to determine as many original articles as possible
		(catch 'problem
		  (nnmairix-call-backend "open-server" nnmairix-backend-server)
		  (unless (gnus-request-head
			   article
			   (gnus-group-prefixed-name
			    folder
			    (list nnmairix-backend nnmairix-backend-server)))
		    (nnheader-message
		     3 "Unable to set mark: couldn't fetch article header for article number %d"
		     article)
		    (throw 'problem nil))
		  (set-buffer nntp-server-buffer)
		  (goto-char (point-min))
		  (let ((case-fold-search t))
		    (re-search-forward "^message-id:.*\\(<.+>\\)" nil t))
		  (setq mid (match-string 1))
		  (unless mid
		    (nnheader-message
		     3 "Unable to set mark: article number %d has no message-id header"
		     article)
		    (throw 'problem nil))
		  ;; get original group. First try registry, then file path
		  (setq ogroup
			(nnmairix-determine-original-group-from-registry mid))
		  (unless (or ogroup
			      nnmairix-only-use-registry)
		    (setq ogroup
			  (nnmairix-determine-original-group-from-path
			   mid nnmairix-current-server)))
		  (unless ogroup
		    (nnheader-message
		     3 "Unable to set mark: couldn't find original group for %s" mid)
		    (throw 'problem nil))
		  ;; store original groups with mid's. We cannot get
		  ;; the article number immediately since this would
		  ;; generate problems with maildir (articles might
		  ;; get moved from /new to /cur and further marks
		  ;; could then not be set)
		  (dolist (cur ogroup)
		    (setq temp (assoc cur
				      nnmairix-marks-cache))
		    (if temp
			(nconc temp (list (list mid type cmdmarks)))
		      (push (list cur (list mid type cmdmarks))
			    nnmairix-marks-cache)))))
	      (nnheader-message 7 "nnmairix: Setting marks... done")))))))

(deffoo nnmairix-close-group (group &optional server)
  (when server
    (nnmairix-open-server server))
  (let* ((qualgroup (gnus-group-prefixed-name group (list 'nnmairix nnmairix-current-server)))
	 (propmarks (gnus-group-get-parameter qualgroup 'propmarks))
	 method)
    (when (and propmarks
	       nnmairix-marks-cache)
      (when (or (eq nnmairix-propagate-marks-upon-close t)
		(and (eq nnmairix-propagate-marks-upon-close 'ask)
		     (y-or-n-p "Propagate marks to original articles? ")))
      (with-current-buffer gnus-group-buffer
	(nnmairix-propagate-marks)
	;; update mairix group
	(gnus-group-jump-to-group qualgroup)
	(gnus-group-get-new-news-this-group))))))

(autoload 'nnimap-request-update-info-internal "nnimap")

(deffoo nnmairix-request-marks (group info &optional server)
;; propagate info from underlying IMAP folder to nnmairix group
;; This is currently experimental and must be explicitly activated
;; with nnmairix-propagate-marks-to-nnmairix-group
  (when server
    (nnmairix-open-server server))
  (let* ((qualgroup (gnus-group-prefixed-name
		    group
		    (list 'nnmairix nnmairix-current-server)))
	 (readmarks (gnus-group-get-parameter qualgroup 'readmarks))
	 (propmarks (gnus-group-get-parameter qualgroup 'propmarks))
	 (folder (nnmairix-get-backend-folder group server))
	 (corr (nnmairix-get-numcorr group server))
	 (docorr (and corr (not (zerop (cadr corr)))))
	 (folderinfo `(,group 1 ((1 . 1))))
	 readrange marks)
      (when (and propmarks
		 nnmairix-propagate-marks-to-nnmairix-groups)
	;; these groups are not subscribed, so we have to ask the back end directly
	(if (eq nnmairix-backend 'nnimap)
	    (nnimap-request-update-info-internal folder folderinfo nnmairix-backend-server)
	  (nnmairix-call-backend "request-update-info" folder folderinfo nnmairix-backend-server))
	;; set range of read articles
	(setf (gnus-info-read info)
	      (if docorr
	          (nnmairix-map-range
		   ;; FIXME: Use lexical-binding.
	           `(lambda (x) (+ x ,(cadr corr)))
	           (gnus-info-read folderinfo))
	        (gnus-info-read folderinfo)))
	;; set other marks
	(setf (gnus-info-marks info)
	      (if docorr
		  (mapcar (lambda (cur)
			    (cons
			     (car cur)
			     (nnmairix-map-range
			      ;; FIXME: Use lexical-binding.
			      `(lambda (x) (+ x ,(cadr corr)))
			      (list (cadr cur)))))
			  (gnus-info-marks folderinfo))
		(gnus-info-marks folderinfo))))
      (when (eq readmarks 'unread)
	(setf (gnus-info-read info) nil))
      (when (eq readmarks 'read)
	(setf (gnus-info-read info) (gnus-active qualgroup))))
  t)

(nnoo-define-skeleton nnmairix)


;;; === Interactive functions

(defun nnmairix-create-search-group (server group query threads)
  "Create on SERVER nnmairix search group GROUP with QUERY.
If THREADS is t, include whole threads from found messages.  If
called interactively, user will be asked for parameters."
  (interactive
   (list
    (gnus-server-to-method (car (nnmairix-get-server)))
    (read-string "Group name: ")
    (read-string "Query: ")
    (y-or-n-p "Include threads? ")))
  (when (and (stringp query)
	     (string-match "\\s-" query))
    (setq query (split-string query)))
  (when (not (listp query))
    (setq query (list query)))
  (when (and server group query)
    (save-excursion
      (let ((groupname (gnus-group-prefixed-name group server))
	    info)
	(set-buffer gnus-group-buffer)
	(gnus-group-make-group group server)
	(gnus-group-set-parameter groupname 'query  query)
	(gnus-group-set-parameter groupname 'threads threads)
	(nnmairix-update-and-clear-marks groupname)))))

(defun nnmairix-search-interactive ()
  "Create mairix search interactively with the minibuffer."
  (interactive)
  (let ((char-header nnmairix-interactive-query-parameters)
	header finished query achar)
    (while (not finished)
      (while (not achar)
	(message "Query (%s): " (nnmairix-create-message-line-for-search))
	  (setq achar (read-char))
	  (when (not (assoc achar char-header))
	    (setq achar nil)))
      (setq header (read-string
		    (concat "Match " (nth 3 (assoc achar char-header)) " on: ")))
	(push  (concat (nth 2 (assoc achar char-header)) ":" header) query)
	(setq finished (not (y-or-n-p "Add another search query? "))
	      achar nil))
    (nnmairix-search
     (mapconcat 'identity query " ")
     (car (nnmairix-get-server))
     (y-or-n-p "Include whole threads? "))))

(defun nnmairix-create-search-group-from-message ()
  "Interactively create search group with query based on current message."
  (interactive)
  (let ((char-header nnmairix-interactive-query-parameters)
	(server (nnmairix-backend-to-server gnus-current-select-method))
	 query achar header finished group threads cq)
    (when (or (not (gnus-buffer-live-p gnus-article-buffer))
	      (not (gnus-buffer-live-p gnus-summary-buffer)))
      (error "No article or summary buffer"))
    (when (not server)
      (error "No nnmairix server found for back end %s:%s"
	     (symbol-name (car gnus-current-select-method))
	     (nth 1 gnus-current-select-method)))
    (while (not finished)
      (save-excursion
	(gnus-summary-toggle-header 1)
	(while (not achar)
	  (message "Query (%s): " (nnmairix-create-message-line-for-search))
	  (setq achar (read-char))
	  (when (not (assoc achar char-header))
	    (setq achar nil)))
	(set-buffer gnus-article-buffer)
	(setq header nil)
	(when (setq cq (nth 1 (assoc achar char-header)))
	  (setq header
		(nnmairix-replace-illegal-chars
		 (gnus-fetch-field (nth 1 (assoc achar char-header))))))
	(setq header (read-string
		      (concat "Match " (nth 3 (assoc achar char-header)) " on: ")
		      header))
	(push  (concat (nth 2 (assoc achar char-header)) ":" header) query)
	(setq finished (not (y-or-n-p "Add another search query? "))
	      achar nil)))
    (setq threads (y-or-n-p "Include whole threads? "))
    (setq group (read-string "Group name: "))
    (set-buffer gnus-summary-buffer)
    (message "Creating group %s on server %s with query %s." group
	     (gnus-method-to-server server) (mapconcat 'identity query " "))
    (nnmairix-create-search-group server group query threads)))

(defun nnmairix-create-server-and-default-group ()
  "Interactively create new nnmairix server with default search group.
All necessary information will be queried from the user."
  (interactive)
  (let* ((name (read-string "Name of the mairix server: "))
	(server (gnus-completing-read "Back end server"
				 (nnmairix-get-valid-servers) t))
	(mairix (read-string "Command to call mairix: " "mairix"))
	(defaultgroup (read-string "Default search group: "))
	(backend (symbol-name (car (gnus-server-to-method server))))
	(servername (nth 1 (gnus-server-to-method server)))
	(hidden (and (string-match "^nn\\(imap\\|maildir\\)$" backend)
		     (y-or-n-p
		      "Does the back end server work with maildir++ (i.e. hidden directories)? ")))
	create)

    (apply (intern (format "%s-%s" backend "open-server"))
	   (list servername))

    (when (and hidden
	       (string-match "^\\." defaultgroup))
      (setq defaultgroup (substring defaultgroup 1)))
    ;; Create default search group
    (gnus-group-make-group
     defaultgroup (list 'nnmairix name  (list 'nnmairix-backend (intern backend))
			(list 'nnmairix-backend-server servername)
			(list 'nnmairix-mairix-command mairix)
			(list 'nnmairix-hidden-folders hidden)
			(list 'nnmairix-default-group defaultgroup)))))

(defun nnmairix-group-change-query-this-group (&optional query)
  "Set QUERY for group under cursor."
  (interactive)
  (let* ((group (gnus-group-group-name))
	 (method (gnus-find-method-for-group group))
	 (oldquery (gnus-group-get-parameter group 'query t)))
    (if (eq (car method) 'nnmairix)
	(progn
	  (when (listp oldquery)
	    (setq oldquery (mapconcat 'identity oldquery " ")))
	  (setq query (or query
			  (read-string "New query: " oldquery)))
	  (when (stringp query)
	    (setq query (split-string query)))
	  (when query
	    (gnus-group-set-parameter group 'query query)
	    (nnmairix-update-and-clear-marks group)))
      (error "This is no nnmairix group"))))


(defun nnmairix-group-toggle-threads-this-group (&optional threads)
  "Toggle threads parameter for this group.
If THREADS is a positive number, set threads parameter to t.
If THREADS is a negative number, set it to nil."
  (interactive)
  (let ((group (gnus-group-group-name)))
    (when (nnmairix-group-toggle-parameter
	   group 'threads "Threads" threads)
      (nnmairix-update-and-clear-marks group))))

(defun nnmairix-group-toggle-propmarks-this-group (&optional propmarks)
  "Toggle marks propagation for this group.
If PROPMARKS is a positive number, set parameter to t.
If PROPMARKS is a negative number, set it to nil."
  (interactive)
  (unless (nnmairix-check-mairix-version "maildirpatch")
    (error "You need a mairix binary with maildir patch to use this feature.  See docs for details"))
  (let ((group (gnus-group-group-name)))
    (when (or (not (string= (gnus-group-short-name group)
			    (cadr (assoc 'nnmairix-default-group
					(gnus-find-method-for-group group)))))
	      (y-or-n-p "You should not activate marks propagation for the default \
search group.  Are you sure? "))
      (nnmairix-group-toggle-parameter
       group 'propmarks "Marks propagation" propmarks))))

(defun nnmairix-group-toggle-allowfast-this-group (&optional allowfast)
  "Toggle fast entering for this group.
If ALLOWFAST is a positive number, set parameter to t.
If ALLOWFAST is a negative number, set it to nil."
  (interactive)
  (nnmairix-group-toggle-parameter
   (gnus-group-group-name) 'allow-fast "Fast entering" allowfast))


(defun nnmairix-group-toggle-readmarks-this-group (&optional readmarks)
  "Toggle read/unread marks for this group.
If READMARKS is a positive number, articles will always be read.
If READMARKS is a negative number, articles will always be unread.
If READMARKS is t or zero, marks will stay unchanged."
  (interactive)
  (let*  ((group (gnus-group-group-name))
	  (method (gnus-find-method-for-group group))
	  (readmarks (or readmarks
			 (gnus-group-get-parameter group 'readmarks))))
    (if (eq (car method) 'nnmairix)
	(cond
	 ((or (and (numberp readmarks) (< readmarks 0))
	      (eq readmarks 'read))
	  (gnus-group-set-parameter group 'readmarks 'unread)
	  (nnheader-message 3 "Articles in %s always unread." group))
	 ((or (and (numberp readmarks) (> readmarks 0))
	      (not readmarks))
	      (gnus-group-set-parameter group 'readmarks 'read)
	      (nnheader-message 3 "Articles in %s always read." group))
	 (t
	  (gnus-group-set-parameter group 'readmarks nil)
	  (nnheader-message 3 "Read marks in %s stay unchanged." group)))
      (error "This is no nnmairix group"))))


(defun nnmairix-search (query &optional server threads)
  "Sends QUERY to nnmairix backend SERVER, using default its search group.

Default search group is automatically entered and results are shown.
If THREADS is t, enable threads.
If THREADS is a negative number, disable threads.
Otherwise, leave threads parameter as it is."
  (interactive (list (read-string "Query: ")))
  (when (not server)
    (setq server (car (nnmairix-get-server))))
  (if (not server)
      (error "No opened nnmairix server found")
    (setq server (gnus-server-to-method server)))
  (nnmairix-open-server (nth 1 server))
  (let* ((qualgroup (gnus-group-prefixed-name nnmairix-default-group
					      (list 'nnmairix (nth 1 server)))))
    (set-buffer gnus-group-buffer)
    (when (stringp query)
      (setq query (split-string query)))
    (gnus-group-set-parameter qualgroup 'query query)
    (if (symbolp threads)
	(when (eq threads 't)
	  (gnus-group-set-parameter qualgroup 'threads t))
      (when (< threads 0)
	(gnus-group-set-parameter qualgroup 'threads nil)))
    (nnmairix-update-and-clear-marks qualgroup)
    (unless (equal (gnus-active qualgroup) '(1 . 0))
      (gnus-group-read-group nil t qualgroup))))

(defun nnmairix-search-thread-this-article ()
  "Search thread for the current article.
This is effectively a shortcut for calling `nnmairix-search'
with m:msgid of the current article and enabled threads."
  (interactive)
  (let* ((server
	  (nnmairix-backend-to-server gnus-current-select-method))
	 mid)
    (if server
	(if (gnus-buffer-live-p gnus-article-buffer)
	    (progn
	      (with-current-buffer gnus-article-buffer
		(gnus-summary-toggle-header 1)
		(setq mid (message-fetch-field "Message-ID")))
	      (while (string-match "[<>]" mid)
		(setq mid (replace-match "" t t mid)))
	      (nnmairix-search (concat "m:" mid) server t))
	  (message "No article buffer."))
      (error "No nnmairix server found for back end %s:%s"
	     (symbol-name (car gnus-current-select-method))
	     (nth 1 gnus-current-select-method)))))

(defun nnmairix-search-from-this-article ()
  "Search messages from sender of the current article.
This is effectively a shortcut for calling `nnmairix-search' with
f:current_from."
  (interactive)
  (let* ((server
	  (nnmairix-backend-to-server gnus-current-select-method))
	 from)
    (if server
	(if (gnus-buffer-live-p gnus-article-buffer)
	    (progn
	      (with-current-buffer gnus-article-buffer
		(gnus-summary-toggle-header 1)
		(setq from (cadr (gnus-extract-address-components
				  (gnus-fetch-field "From"))))
		(nnmairix-search (concat "f:" from) server -1)))
	  (message "No article buffer."))
      (error "No nnmairix server found for back end %s:%s"
	     (symbol-name (car gnus-current-select-method))
	     (nth 1 gnus-current-select-method)))))


(defun nnmairix-purge-old-groups (&optional dontask server)
  "Delete mairix search groups which are no longer used.

You may want to call this from time to time if you are creating
and deleting lots of nnmairix groups.  If DONTASK is t, do not ask
before deleting a group on the back end.  SERVER specifies nnmairix server."
  (interactive)
  (let ((server (or server
		    (gnus-server-to-method (car (nnmairix-get-server))))))
    (if (nnmairix-open-server (nth 1 server))
	(when (nnmairix-call-backend
	       "request-list" nnmairix-backend-server)
	  (let (cur qualgroup folder)
	    (with-current-buffer nntp-server-buffer
	      (goto-char (point-min))
	      (while (re-search-forward nnmairix-group-regexp (point-max) t)
		(setq cur (match-string 0)
		      qualgroup (gnus-group-prefixed-name
				 (match-string 1) server))
		(when (not (and (gnus-group-entry qualgroup)
				(string= cur
					 (gnus-group-get-parameter
					  qualgroup 'folder))))
		  (when (or dontask
			    (y-or-n-p
			     (concat "Delete group " cur
				     " on server " nnmairix-backend-server "? ")))
		    (nnmairix-call-backend
		     "request-delete-group" cur t nnmairix-backend-server)))))))
      (message "Couldn't open server %s" (nth 1 server)))))


(defun nnmairix-update-database (&optional servers)
  "Call mairix for updating the database for SERVERS.

If SERVERS is nil, do update for all nnmairix servers.  Mairix
will be called asynchronously unless
`nnmairix-mairix-synchronous-update' is t.  Mairix will be called
with `nnmairix-mairix-update-options'."
  (interactive)
  (let ((servers (or servers
		     (nnmairix-get-nnmairix-servers)))
	args cur commandsplit)
    (while servers
      (setq cur (car (pop servers)))
      (nnmairix-open-server
       (nth 1 (gnus-server-to-method cur)))
      (setq commandsplit (split-string nnmairix-mairix-command))
      (nnheader-message 7 "Updating mairix database for %s..." cur)
      (if nnmairix-mairix-synchronous-update
	  (progn
	    (setq args (append (list (car commandsplit) nil
				     (get-buffer nnmairix-mairix-output-buffer)
				     nil)))
	    (if (> (length commandsplit) 1)
		(setq args (append args (cdr commandsplit) nnmairix-mairix-update-options))
	      (setq args (append args nnmairix-mairix-update-options)))
	    (apply 'call-process args)
	    (nnheader-message 7 "Updating mairix database for %s... done" cur))
	(progn
	  (setq args (append (list cur (get-buffer nnmairix-mairix-output-buffer)
				   (car commandsplit))))
	  (if (> (length commandsplit) 1)
	      (setq args (append args (cdr commandsplit) nnmairix-mairix-update-options))
	    (setq args (append args nnmairix-mairix-update-options)))
	  (set-process-sentinel (apply 'start-process args)
				'nnmairix-sentinel-mairix-update-finished))))))

(defun nnmairix-group-delete-recreate-this-group ()
  "Deletes and recreates group on the back end.
You can use this function on nnmairix groups which continuously
show wrong article counts."
  (interactive)
  (let* ((group (gnus-group-group-name))
	 (method (gnus-find-method-for-group group)))
    (unless (eq (car method) 'nnmairix)
      (error "This is not a nnmairix group"))
    (when (y-or-n-p
	   (format "Really recreate group %s on the back end? " group))
      (nnmairix-delete-recreate-group group)
      (gnus-group-get-new-news-this-group))))

(defun nnmairix-propagate-marks (&optional server)
  "Propagate marks from nnmairix group to original articles.
Unless SERVER is explicitly specified, will use the last opened
nnmairix server.  Only marks from current session will be set."
  (interactive)
  (if server
      (nnmairix-open-server server)
    (unless (eq (car gnus-current-select-method) 'nnmairix)
      (if nnmairix-current-server
	  (nnmairix-open-server nnmairix-current-server)
	(error "No opened nnmairix server"))))
  (if nnmairix-marks-cache
      (let (number ogroup number-cache method mid-marks temp)
	;; first we get the article numbers
	(catch 'problem
	  (while (setq ogroup (pop nnmairix-marks-cache))
	    (while (setq mid-marks (pop (cdr ogroup)))
	      (setq number
		    (cdr
		     (gnus-request-head (car mid-marks) (car ogroup))))
	      (unless number
		(nnheader-message
		 3 "Unable to set mark: couldn't determine article number for %s in %s"
		 (car mid-marks) (car ogroup))
		(throw 'problem nil))
	      (setq temp (assoc (car ogroup) number-cache))
	      (if temp
		  (catch 'done
		    (dolist (cur (cdr temp))
		      (when (equal (cdr cur) (list (nth 1 mid-marks) (nth 2 mid-marks)))
			(nconc (car cur) (list number))
			(throw 'done nil)))
		    (nconc temp (list (list (list number) (nth 1 mid-marks) (nth 2 mid-marks)))))
		(push (list (car ogroup) (list (list number) (nth 1 mid-marks) (nth 2 mid-marks)))
		      number-cache)))))
	;; now we set the marks
	(with-current-buffer gnus-group-buffer
	  (nnheader-message 5 "nnmairix: Propagating marks...")
	  (dolist (cur number-cache)
	    (setq method (gnus-find-method-for-group (car cur)))
	    (apply (intern (format "%s-%s"
				   (symbol-name (car method))
				   "request-set-mark"))
		   (gnus-group-short-name (car cur))
		   (cdr cur)
		   (list (nth 1 method)))
	    (gnus-group-jump-to-group (car cur))
	    (gnus-group-get-new-news-this-group)))
	(nnheader-message 5 "nnmairix: Propagating marks... done"))
    (nnheader-message 3 "No marks to propagate.")))

(defun nnmairix-update-groups (servername &optional skipdefault updatedb)
  "Update all search groups on SERVERNAME.
If SKIPDEFAULT is t, the default search group will not be
updated.
If UPDATEDB is t, database for SERVERNAME will be updated first."
  (interactive (list (gnus-completing-read "Update groups on server"
				(nnmairix-get-nnmairix-servers))))
  (save-excursion
    (when (string-match ".*:\\(.*\\)" servername)
      (setq servername (match-string 1 servername)))
    (if (not (assoc (format "nnmairix:%s" servername)
		    (nnmairix-get-nnmairix-servers)))
	(nnheader-message 3 "Server %s not opened" servername)
      (when updatedb
	(let ((nnmairix-mairix-synchronous-update t))
	  (nnmairix-update-database
	   (list (list (format "nnmairix:%s" servername))))))
      (let ((groups (nnmairix-get-groups-from-server servername))
	    default)
	(when skipdefault
	  (setq default
		(format "nnmairix+%s:%s"
			servername
			(cadr
			 (assoc 'nnmairix-default-group
				(gnus-server-to-method
				 (format "nnmairix:%s" servername)))))))
	(dolist (cur groups)
	  (unless (and skipdefault
		       (string= (car cur) default))
	    (gnus-group-jump-to-group (car cur))
	    (gnus-group-mark-group 1)))
	(gnus-group-get-new-news-this-group)))))

(defun nnmairix-remove-tick-mark-original-article ()
  "Remove tick mark from original article.
Marks propagation has to be enabled for this to work."
  (interactive)
  (unless (eq (car gnus-current-select-method) 'nnmairix)
    (error "Not in a nnmairix group"))
  (save-excursion
    (let ((mid (mail-header-message-id (gnus-summary-article-header)))
	  groups cur)
      (when mid
	(setq groups (nnmairix-determine-original-group-from-registry mid))
	(unless (or groups
		    nnmairix-only-use-registry)
	  (setq groups
		(nnmairix-determine-original-group-from-path mid nnmairix-current-server)))
	(unless groups
	  (error "Couldn't find original article"))
	(dolist (cur groups)
	  (push `(,cur (,mid del (tick))) nnmairix-marks-cache))
	(nnheader-message 5 "Will remove tick mark for %s upon closing." mid)))))

;;; ==== Helper functions

(defun nnmairix-request-group-with-article-number-correction (folder qualgroup)
  "Request FOLDER on back end for nnmairix QUALGROUP and article number correction."
  (save-excursion
    (nnmairix-call-backend "request-group" folder nnmairix-backend-server)
    (set-buffer nnmairix-mairix-output-buffer)
    (goto-char (point-min))
    (re-search-forward "^Matched.*messages")
    (nnheader-message 7 (match-string 0))
    (set-buffer nntp-server-buffer)
    (goto-char (point-min))
    (let ((status (read (current-buffer)))
	  (total (read (current-buffer)))
	  (low (read (current-buffer)))
	  (high (read (current-buffer)))
	  (corr (gnus-group-get-parameter qualgroup 'numcorr t)))
      (if (= status 211)
	  (progn
	    ;; Article number correction
	    (if (and corr
		     (> (+ (car (cddr corr)) high) 0))
		(progn
		  (when (car corr) ;Group has changed
		    (setq corr
			  (list nil
				(car (cddr corr))
				(+ (car (cddr corr)) high)))
		    (gnus-group-set-parameter
		     qualgroup 'numcorr corr))
		  (setq low (+ low (cadr corr))
			high (+ high (cadr corr))))
	      (when (member nnmairix-backend
			    nnmairix-delete-and-create-on-change)
		(gnus-group-set-parameter
		 qualgroup 'numcorr (list nil 0 high))))
	    (erase-buffer)
	    (insert (format "%d %d %d %d %s" status total low high
			    (gnus-group-real-name qualgroup)))
	    t)
	(progn
	  (nnheader-report
	   'nnmairix "Error calling back end on group %s" folder)
	  nil)))))

(defun nnmairix-call-mairix-binary (command folder searchquery threads)
  "Call mairix binary with COMMAND, using FOLDER and SEARCHQUERY.
If THREADS is non-nil, enable full threads."
  (let ((args (cons (car command) '(nil t nil))))
    (with-current-buffer
       (get-buffer-create nnmairix-mairix-output-buffer)
      (erase-buffer)
      (when (> (length command) 1)
	(setq args (append args (cdr command))))
      (when nnmairix-mairix-search-options
	(setq args (append args nnmairix-mairix-search-options)))
      ;; If we have a patched mairix binary, call it with "-c"
      (when (nnmairix-check-mairix-version "maildirpatch")
	(setq args (append args '("-c"))))
      (when threads
	(setq args (append args '("-t"))))
      (apply 'call-process
	     (append args (list "-o" folder) searchquery)))))

(defun nnmairix-call-mairix-binary-raw (command query)
  "Call mairix binary with COMMAND and QUERY in raw mode."
  (let ((args (cons (car command) '(nil t nil))))
    (with-current-buffer
       (get-buffer-create nnmairix-mairix-output-buffer)
      (erase-buffer)
      (when (> (length command) 1)
        (setq args (append args (cdr command))))
      (setq args (append args '("-r")))
      (apply 'call-process
             (append args query)))))

(defun nnmairix-get-server ()
  "If there exists just one nnmairix server, return its value.
Otherwise, ask user for server."
  (let ((openedserver (nnmairix-get-nnmairix-servers)))
    (when (not openedserver)
      (error "No opened nnmairix server found"))
    (if (> (length openedserver) 1)
	(progn
	  (while
	      (equal '("")
		  (setq nnmairix-last-server
			(list (gnus-completing-read "Server" openedserver t
					       (or nnmairix-last-server
						   "nnmairix:"))))))
	  nnmairix-last-server)
      (car openedserver))))

(defun nnmairix-get-nnmairix-servers (&optional all)
  "Return available nnmairix servers.
If ALL is t, return also the unopened/failed ones."
  (let ((alist gnus-opened-servers)
	server openedserver)
    (while alist
      (setq server (pop alist))
      (when (and server
		 (or all
		     (eq (cadr server) 'ok))
		 (eq (caar server) 'nnmairix)
		 (not (member (car server) gnus-ephemeral-servers)))
	(setq server
	      (concat (symbol-name (caar server)) ":" (nth 1 (car server))))
	(push (list server) openedserver)))
    openedserver))

(defun nnmairix-get-valid-servers ()
  "Return list of valid back end servers for nnmairix groups."
  (let ((alist gnus-opened-servers)
	(mairixservers (nnmairix-get-nnmairix-servers t))
	server mserver openedserver occ cur)
    ;; Get list of all nnmairix backends (i.e. backends which are
    ;; already occupied)
    (dolist (cur mairixservers)
      (push
       (concat
	(symbol-name
	 (cadr (assoc 'nnmairix-backend
		      (gnus-server-to-method (car cur)))))
	 ":"
	 (cadr (assoc 'nnmairix-backend-server
		      (gnus-server-to-method (car cur)))))
	occ))
    (while alist
      (setq server (pop alist))
      (setq mserver (gnus-method-to-server (car server)))
      ;; If this is the native server, convert it to the real server
      ;; name to avoid confusion
      (when (string= mserver "native")
	(setq mserver (format "%s:%s"
			      (caar server)
			      (nth 1 (car server)))))
      (when (and server
		 (eq (cadr server) 'ok)
		 (member (caar server) nnmairix-valid-backends)
		 (not (member (car server) gnus-ephemeral-servers))
		 (not (member (gnus-method-to-server (car server)) occ)))
	(push
	 mserver
	 openedserver)))
    openedserver))

(defun nnmairix-get-groups-from-server (servername)
  "Return all groups for nnmairix server SERVERNAME."
  (let ((searchstring (format "nnmairix\\+%s:" servername))
	groups)
    (dolist (cur gnus-newsrc-alist)
      (when (string-match searchstring
			  (car cur))
	(push (list (car cur)) groups)))
    groups))

(defun nnmairix-call-backend (func &rest args)
  "Call a function FUNC on backend with ARGS."
  (apply (intern (format "%s-%s" (symbol-name nnmairix-backend) func)) args))

(defun nnmairix-get-backend-folder (group &optional server)
  "Return back end GROUP from nnmairix group on SERVER."
  (let* ((qualgroup (if server
			(gnus-group-prefixed-name group (list 'nnmairix server))
		      group))
	 (folder (gnus-group-get-parameter qualgroup 'folder)))
    folder))

(defun nnmairix-get-numcorr (group &optional server)
  "Return values for article number correction nnmairix GROUP on SERVER."
  (let* ((qualgroup (if server
			(gnus-group-prefixed-name group (list 'nnmairix server))
		      group))
	 (corr (gnus-group-get-parameter qualgroup 'numcorr t)))
    corr))


(defun nnmairix-rename-files-consecutively (path)
  "Rename all nnml mail files in PATH so that they have consecutive numbers.
This should correct problems of wrong article counts when using
nnmairix with nnml backends."
  (let* ((files
	 (sort
	  (mapcar 'string-to-number
		  (directory-files path nil "[0-9]+" t))
	  '<))
	 (lastplusone (car files))
	 (path (file-name-as-directory path)))
    (dolist (cur files)
      (when (not (= cur lastplusone))
	(rename-file (concat path
			     (number-to-string cur))
		     (concat path
			     (number-to-string lastplusone)))
	(setq cur lastplusone))
      (setq lastplusone (1+ cur)))))

(defun nnmairix-replace-group-and-numbers (articles backendgroup mairixgroup numc type)
  "Replace folder names in Xref header and correct article numbers.
Do this for all ARTICLES on BACKENDGROUP.  Replace using
MAIRIXGROUP.  NUMC contains values for article number correction.
TYPE is either `nov' or `headers'."
  (nnheader-message 7 "nnmairix: Rewriting headers...")
  (cond
   ((eq type 'nov)
    (let ((buf (get-buffer-create " *nnmairix buffer*"))
	  (corr (not (zerop numc)))
	  (name (buffer-name nntp-server-buffer))
	  header cur xref)
      (with-current-buffer buf
	(erase-buffer)
	(set-buffer nntp-server-buffer)
	(goto-char (point-min))
	(mapc
	 (lambda (article)
	   (when (or (looking-at (number-to-string article))
		     (nnheader-find-nov-line article))
	     (setq cur (nnheader-parse-nov))
	     (when corr
	       (setq article (+ (mail-header-number cur) numc))
	       (setf (mail-header-number cur) article))
	     (setq xref (mail-header-xref cur))
	     (when (and (stringp xref)
			(string-match (format "[ \t]%s:[0-9]+" backendgroup) xref))
	       (setq xref (replace-match (format " %s:%d" mairixgroup article) t nil xref))
	       (setf (mail-header-xref cur) xref))
	     (set-buffer buf)
	     (nnheader-insert-nov cur)
	     (set-buffer nntp-server-buffer)
	     (when (not (eobp))
	       (forward-line 1))))
	 articles)
	(kill-buffer nntp-server-buffer)
	(set-buffer buf)
	(rename-buffer name)
	(setq nntp-server-buffer buf))))
   ((and (eq type 'headers)
	 (not (zerop numc)))
    (with-current-buffer nntp-server-buffer
      (save-excursion
	(goto-char (point-min))
	(while (re-search-forward "^[23][0-9]+ \\([0-9]+\\)" nil t)
	  (replace-match (number-to-string
			  (+ (string-to-number (match-string 1)) numc))
			 t t nil 1))))))
  (nnheader-message 7 "nnmairix: Rewriting headers... done"))

(defun nnmairix-backend-to-server (server)
  "Return nnmairix server most probably responsible for back end SERVER.
User will be asked if this cannot be determined.  Result is saved in
parameter `indexed-servers' of corresponding default search
group."
  (let ((allservers (nnmairix-get-nnmairix-servers))
	mairixserver found defaultgroup)
    (if (> (length allservers) 1)
	(progn
	  ;; If there is more than one nnmairix server, we go through them
	  (while (and allservers (not found))
	    (setq mairixserver (gnus-server-to-method (car (pop allservers))))
	    ;; First we look if SERVER is the backend of current nnmairix server
	    (setq found (and (eq (cadr (assoc 'nnmairix-backend mairixserver))
				 (car server))
			     (string= (cadr (assoc 'nnmairix-backend-server mairixserver))
				      (nth 1 server))))
	    ;; If that's not the case, we look at 'indexed-servers
	    ;; variable in default search group
	    (when (not found)
	      (setq defaultgroup (cadr (assoc 'nnmairix-default-group mairixserver)))
	      (setq found (member (gnus-method-to-server server)
				  (gnus-group-get-parameter
				   (gnus-group-prefixed-name defaultgroup
							     mairixserver)
				   'indexed-servers t)))))
	  ;; If still not found, we ask user
	  (when (not found)
	    (setq mairixserver
		  (gnus-server-to-method
		   (gnus-completing-read
		    (format "Cannot determine which nnmairix server indexes %s. Please specify"
			    (gnus-method-to-server server))
		    (nnmairix-get-nnmairix-servers) nil "nnmairix:")))
	    ;; Save result in parameter of default search group so that
	    ;; we don't have to ask again
	    (setq defaultgroup (gnus-group-prefixed-name
				(cadr (assoc 'nnmairix-default-group mairixserver)) mairixserver))
	    (gnus-group-set-parameter
	     defaultgroup
	     'indexed-servers
	     (append (gnus-group-get-parameter defaultgroup 'indexed-servers t)
		     (list (gnus-method-to-server server)))))
	  mairixserver)
      ;; If there is just one (or none) nnmairix server:
      (gnus-server-to-method (caar allservers)))))


(defun nnmairix-delete-recreate-group (group)
  "Delete and recreate folder from GROUP on the back end."
  (when (member nnmairix-backend nnmairix-delete-and-create-on-change)
    (let ((folder (gnus-group-get-parameter group 'folder)))
      (if (string-match nnmairix-group-regexp folder)
	  (progn
	    (nnmairix-call-backend "open-server"
				   nnmairix-backend-server)
	    (nnmairix-call-backend "request-delete-group"
				   folder t nnmairix-backend-server)
	    (nnmairix-call-backend "request-create-group"
				   folder nnmairix-backend-server))
	(error "`nnmairix-delete-recreate-group' called on \
non-mairix group.  Check folder parameter")))))

(defun nnmairix-update-and-clear-marks (group &optional method)
  "Update group and clear all marks from GROUP using METHOD."
  (let ((method (or method
		    (gnus-find-method-for-group group)))
	(corr (gnus-group-get-parameter group 'numcorr t))
	info)
    (unless (or (gnus-group-prefixed-p group)
		(not method))
      (setq group (gnus-group-prefixed-name group method)))
    (if (eq (nth 0 method) 'nnmairix)
	(save-excursion
	  (nnmairix-open-server (nth 1 method))
	  (set-buffer gnus-group-buffer)
	  ;; (gnus-group-set-parameter group 'propmarks nil)
	  (setq info (gnus-get-info group))
	  ;; Clear active and info
	  (gnus-set-active group nil)
	  (gnus-info-clear-data info)
	  ;; Delete and re-create group if needed
	  (nnmairix-delete-recreate-group group)
	  ;; set flag that group has changed for article number correction
	  (when (member nnmairix-backend nnmairix-delete-and-create-on-change)
	    (when corr
	      (setcar corr t)
	      (gnus-group-set-parameter group 'numcorr corr)))
	  (gnus-group-jump-to-group group)
	  (gnus-group-get-new-news-this-group))
      (error "`nnmairix-update-and-clear-marks' called with non-nnmairix group"))))

(defun nnmairix-sentinel-mairix-update-finished (proc status)
  "Sentinel for mairix update process PROC with STATUS."
  (if (equal status "finished\n")
      (nnheader-message 7 "Updating mairix database for %s... done" proc)
    (error "There was an error updating the mairix database for server %s.  \
See %s for details" proc nnmairix-mairix-output-buffer)))

(defun nnmairix-create-message-line-for-search ()
  "Create message line for interactive query in minibuffer."
  (mapconcat
   (function
    (lambda (cur)
      (format "%c=%s" (car cur) (nth 3 cur))))
   nnmairix-interactive-query-parameters ","))

(defun nnmairix-replace-illegal-chars (header)
  "Replace illegal characters in HEADER for mairix query."
  (when header
    (while (string-match "[^-.@/,& [:alnum:]]" header)
      (setq header (replace-match "" t t header)))
    (while (string-match "[-& ]" header)
      (setq header (replace-match "," t t header)))
    header))

(defun nnmairix-group-toggle-parameter (group parameter description &optional par)
  "Toggle on GROUP a certain PARAMETER.
DESCRIPTION will be shown to the user with the activation
status.  If PAR is a positive number, the group parameter will be
set to t and to nil otherwise."
  (let* ((method (gnus-find-method-for-group group))
	 (par (or par
		  (not (gnus-group-get-parameter group parameter)))))
    (if (eq (car method) 'nnmairix)
	(progn
	  (when (numberp par)
	    (setq par (> par 0)))
	  (gnus-group-set-parameter group parameter par)
	  (if par
	      (message "%s activated for group %s" description group)
	    (message "%s deactivated for group %s" description group))
	  t)
      (error "This is no nnmairix group")
      nil)))

;; Search for original article helper functions

(defun nnmairix-goto-original-article (&optional no-registry)
  "Jump to the original group and display article.
The original group of the article is first determined with the
registry (if enabled).  If the registry is not enabled or did not
find the article or the prefix NO-REGISTRY is non-nil, this
function will try to determine the original group form the path
of the mail file.  The path is obtained through another mairix
search in raw mode."
  (interactive "P")
  (when (not (eq (car gnus-current-select-method) 'nnmairix))
    (let ((method (gnus-find-method-for-group gnus-newsgroup-name)))
      (if (eq (car method) 'nnmairix)
	  (nnmairix-open-server (nth 1 method))
	(error "Not in a nnmairix group"))))
  (when (not (gnus-buffer-live-p gnus-article-buffer))
    (error "No article buffer available"))
  (let ((server (nth 1 gnus-current-select-method))
	mid rval group allgroups)
    ;; get message id
    (with-current-buffer gnus-article-buffer
      (gnus-summary-toggle-header 1)
      (setq mid (message-fetch-field "Message-ID"))
      ;; first check the registry (if available)
      (unless no-registry
	(setq allgroups (nnmairix-determine-original-group-from-registry mid)))
      (unless (or allgroups
		  nnmairix-only-use-registry)
	;; registry was not available or did not find article
	;; so we search again with mairix in raw mode to get filename
	(setq allgroups
	      (nnmairix-determine-original-group-from-path mid server)))
      (if (> (length allgroups) 1)
	  (setq group
		(gnus-completing-read
		 "Message exists in more than one group. Choose"
		 allgroups t))
	(setq group (car allgroups))))
    (if group
	;; show article in summary buffer
	(nnmairix-show-original-article group mid)
      (nnheader-message 3 "Couldn't find original article"))))

(defun nnmairix-determine-original-group-from-registry (mid)
  "Try to determine original group for message-id MID from the registry."
  (when (bound-and-true-p gnus-registry-enabled)
    (unless (string-match "^<" mid)
      (set mid (concat "<" mid)))
    (unless (string-match ">$" mid)
      (set mid (concat mid ">")))
    (gnus-registry-get-id-key mid 'group)))

(defun nnmairix-determine-original-group-from-path (mid server)
  "Determine original group(s) for message-id MID from the file path.
The file path is obtained through a mairix search for the id on
SERVER."
  (nnmairix-open-server server)
  (while (string-match "[<>]" mid)
    (setq mid (replace-match "" t t mid)))
  ;; mairix somehow does not like '$' in message-id
  (when (string-match "\\$" mid)
    (setq mid (concat mid "=")))
  (while (string-match "\\$" mid)
    (setq mid (replace-match "=," t t mid)))
  (let (allgroups)
    (if (zerop (nnmairix-call-mairix-binary-raw
		(split-string nnmairix-mairix-command)
		(list (concat "m:" mid))))
	(with-current-buffer nnmairix-mairix-output-buffer
	  (goto-char (point-min))
	  (while (re-search-forward "^/.*$" nil t)
	    (push (nnmairix-get-group-from-file-path (match-string 0))
		  allgroups)
	    (forward-line 1)))
      (error "Mairix could not find original article.  See buffer %s for details"
	     nnmairix-mairix-output-buffer))
    allgroups))

(defun nnmairix-get-group-from-file-path (file)
  "Get group by parsing the message location FILE."
  (let (path filename serverbase group maildirflag allgroups)
    (string-match "^\\(.*\\)/\\(.*?\\)$" file)
    (setq path (expand-file-name (match-string 1 file)))
    (setq filename (match-string 2 file))
    ;; when we deal with maildir, remove cur/new/tmp from path
    (setq maildirflag (string-match ".+\\..+\\..+" filename))
    (when maildirflag
      (setq path
	    (replace-regexp-in-string
	     ".*\\(/cur\\|/new\\|/tmp\\)$" "" path t t 1)))
    ;; we first check nnml and nnmaildir servers
    (setq
     group
     (catch 'found
       (dolist (cur gnus-opened-servers)
	 (when (or (and (not maildirflag)
			(eq (caar cur) 'nnml))
		   (and maildirflag
			(eq (caar cur) 'nnmaildir)))
	   ;; get base path from server
	   (if maildirflag
	       (setq serverbase (cadr (assoc 'directory (car cur))))
	     (setq serverbase (cadr (assoc 'nnml-directory (car cur))))
	     (unless serverbase
	       (setq serverbase nnml-directory)))
	   (setq serverbase (file-name-as-directory
			     (expand-file-name serverbase)))
	   (when (string-match (concat serverbase "\\(.*\\)") path)
	     ;; looks good - rest of the path should be the group
	     (setq group (match-string 1 path))
	     (when (string-match "/$" group)
	       (setq group (replace-match "" t t group)))
	     (unless maildirflag
	       ;; for nnml: convert slashes to dots
	       (while (string-match "/" group)
		 (setq group (replace-match "." t t group))))
	     (setq group (gnus-group-prefixed-name group (car cur)))
	     ;; check whether this group actually exists
	     (when (gnus-group-entry group)
	       (throw 'found group)))))))
    (unless group
      ;; we haven't found it yet --> look for nnimap groups. Assume
      ;; last element of the path is the group. This might fail since
      ;; IMAP servers may present groups to the client in arbitrary
      ;; ways...
      (string-match "^.*/\\.?\\(.*\\)$" path)
      (setq group (match-string 1 path))
      ;; convert dots to slashes (nested group)
      (while (string-match "\\." group)
	(setq group (replace-match "/" t t group)))
      (dolist (cur gnus-opened-servers)
	(when (eq (caar cur) 'nnimap)
	  (when (gnus-group-entry
		 (gnus-group-prefixed-name group (car cur)))
	    (push
	     (gnus-group-prefixed-name group (car cur))
	     allgroups))))
      (if (> (length allgroups) 1)
	  (setq group (gnus-completing-read
		       "Group %s exists on more than one IMAP server. Choose"
		       allgroups t))
	(setq group (car allgroups))))
    group))

(defun nnmairix-show-original-article (group mid)
  "Switch to GROUP and display Article with message-id MID."
  (unless (string-match "^<" mid)
    (set mid (concat "<" mid)))
  (unless (string-match ">$" mid)
    (set mid (concat mid ">")))
  (when (string-match "Summary" (buffer-name (current-buffer)))
    (gnus-summary-exit))
  (pop-to-buffer gnus-group-buffer)
  (gnus-group-jump-to-group group)
  (gnus-summary-read-group group 1 t)
  (gnus-summary-refer-article mid)
  (gnus-summary-limit-to-headers (format "message-id: %s" mid))
  (gnus-summary-select-article)
  ;; Force redisplay
  (gnus-summary-show-article)
  (nnheader-message 5 "Switched to group %s." group))

(defun nnmairix-map-range (func range)
  "Map function FUNC on all members of RANGE."
  (cond
   ((numberp range)
    (funcall func range))
   (t
    (mapcar (lambda (cur)
	      (cond
	       ((listp cur)
		(cons
		 (funcall func (car cur))
		 (funcall func (cdr cur))))
	       ((numberp cur)
		(funcall func cur))))
	    range))))

(defun nnmairix-check-mairix-version (version &optional server)
  "Check mairix VERSION on SERVER.
If VERSION is a number: specifies the minimum version.
If VERSION is a string: must be contained in mairix version output."
  (unless server
    (setq server nnmairix-current-server))
  (let ((versionstring (cadr (assoc server nnmairix-version-output))))
    (unless versionstring
      ;; call "mairix -V" to get the version string
      (with-temp-buffer
	(setq versionstring
	      (let* ((commandsplit (split-string nnmairix-mairix-command))
		     (args (append (list (car commandsplit))
				   '(nil t nil) (cdr commandsplit) '("-V"))))
	      (apply 'call-process args)
	      (goto-char (point-min))
	      (re-search-forward "mairix.*")
	      (match-string 0))))
      ;; save version string for current session
      (setq nnmairix-version-output
	    (append nnmairix-version-output
		    (list (list server versionstring)))))
    (cond
     ((stringp version)
      (string-match version versionstring))
     ((numberp version)
      (<= version (string-to-number
		   (progn
		     (string-match "mairix \\([0-9\\.]+\\)" versionstring)
		     (match-string 1 versionstring))))))))

;; ==== Widget stuff

(defvar nnmairix-widgets)
(defvar nnmairix-widgets-values nil)

(defun nnmairix-widget-search-from-this-article ()
  "Create mairix query based on current article using graphical widgets."
  (interactive)
  (nnmairix-widget-search
   (nnmairix-widget-get-values)))

(defun nnmairix-widget-get-values ()
  "Create values for editable fields from current article."
  (if (not (gnus-buffer-live-p gnus-article-buffer))
      (error "No article buffer available")
    (save-excursion
      (gnus-summary-toggle-header 1)
      (set-buffer gnus-article-buffer)
      (mapcar
       (function
	(lambda (field)
	  (list (car (cddr field))
		(if (car field)
		    (nnmairix-replace-illegal-chars
		     (gnus-fetch-field (car field)))
		  nil))))
       nnmairix-widget-fields-list))))


(defun nnmairix-widget-search (&optional mvalues)
  "Create mairix query interactively using graphical widgets.
MVALUES may contain values from current article."
  (interactive)
  ;; Select window for mairix customization
  (funcall nnmairix-widget-select-window-function)
  ;; generate widgets
  (nnmairix-widget-create-query mvalues)
  ;; generate Buttons
  (widget-create 'push-button
		 :notify
		 (if mvalues
		     (lambda (&rest ignore)
		       (nnmairix-widget-send-query nnmairix-widgets
						   t))
		   (lambda (&rest ignore)
		     (nnmairix-widget-send-query nnmairix-widgets
						 nil)))
		 "Send Query")
  (widget-insert "   ")
  (widget-create 'push-button
		 :notify
		 (if mvalues
		     (lambda (&rest ignore)
		       (nnmairix-widget-create-group nnmairix-widgets
						     t))
		   (lambda (&rest ignore)
		     (nnmairix-widget-create-group nnmairix-widgets
						   nil)))
		 "Create permanent group")
  (widget-insert "   ")
  (widget-create 'push-button
		 :notify (lambda (&rest ignore)
			   (kill-buffer nnmairix-customize-query-buffer))
		 "Cancel")
  (use-local-map widget-keymap)
  (widget-setup)
  (goto-char (point-min)))

(defun nnmairix-widget-send-query (widgets &optional withvalues)
  "Send query from WIDGETS to mairix binary.
If WITHVALUES is t, query is based on current article."
  (nnmairix-search
   (nnmairix-widget-make-query-from-widgets widgets)
   (if withvalues
       (gnus-method-to-server
	(nnmairix-backend-to-server gnus-current-select-method))
     (car (nnmairix-get-server)))
   (if (widget-value (cadr (assoc "Threads" widgets)))
       t
     -1))
  (kill-buffer nnmairix-customize-query-buffer))

(defun nnmairix-widget-create-group (widgets &optional withvalues)
  "Create nnmairix group based on current widget values WIDGETS.
If WITHVALUES is t, query is based on current article."
  (let ((group (read-string "Name of the group: ")))
    (when (not (zerop (length group)))
      (nnmairix-create-search-group
       (if withvalues
	   (gnus-method-to-server
	    (nnmairix-backend-to-server gnus-current-select-method))
	 (car (nnmairix-get-server)))
       group
       (nnmairix-widget-make-query-from-widgets widgets)
       (widget-value (cadr (assoc "Threads" widgets))))))
  (kill-buffer nnmairix-customize-query-buffer))


(defun nnmairix-widget-make-query-from-widgets (widgets)
  "Create mairix query from widget values WIDGETS."
  (let (query temp flag)
    ;; first we do the editable fields
    (dolist (cur nnmairix-widget-fields-list)
      ;; See if checkbox is checked
      (when (widget-value
	     (cadr (assoc (concat "c" (car (cddr cur))) widgets)))
	;; create query for the field
	(push
	 (concat
	  (nth 1 cur)
	  ":"
	  (nnmairix-replace-illegal-chars
	   (widget-value
	   (cadr (assoc (concat "e" (car (cddr cur))) widgets)))))
	 query)))
    ;; Flags
    (when (member 'flags nnmairix-widget-other)
      (setq flag
	    (mapconcat
	     (function
	      (lambda (flag)
		(setq temp
		      (widget-value (cadr (assoc (car flag) nnmairix-widgets))))
		(if (string= "yes" temp)
		    (cadr flag)
		  (if (string= "no" temp)
		      (concat "-" (cadr flag))))))
	     '(("seen" "s") ("replied" "r") ("flagged" "f")) ""))
      (when (not (zerop (length flag)))
	(push (concat "F:" flag) query)))
    ;; return query string
    (mapconcat 'identity query " ")))


(defun nnmairix-widget-create-query (&optional values)
  "Create widgets for creating mairix queries.
Fill in VALUES if based on an article."
  (let (allwidgets)
    (when (get-buffer nnmairix-customize-query-buffer)
      (kill-buffer nnmairix-customize-query-buffer))
    (switch-to-buffer nnmairix-customize-query-buffer)
    (kill-all-local-variables)
    (erase-buffer)
    (widget-insert "Specify your query for Mairix (check boxes for activating fields):\n\n")
    (widget-insert
     (substitute-command-keys
      "(Whitespaces will be converted to `,' (i.e. AND). Use `/' for OR.)\n\n"))
;    (make-local-variable 'nnmairix-widgets)
    (setq nnmairix-widgets (nnmairix-widget-build-editable-fields values))
    (when (member 'flags nnmairix-widget-other)
      (widget-insert "\nFlags:\n      Seen:     ")
      (nnmairix-widget-add "seen"
			   'menu-choice
			   :value "ignore"
			   '(item "yes") '(item "no") '(item "ignore"))
      (widget-insert "      Replied:  ")
      (nnmairix-widget-add "replied"
			   'menu-choice
			   :value "ignore"
			   '(item "yes") '(item "no") '(item "ignore"))
      (widget-insert "      Ticked:   ")
      (nnmairix-widget-add "flagged"
			   'menu-choice
			   :value "ignore"
			   '(item "yes") '(item "no") '(item "ignore")))
    (when (member 'threads nnmairix-widget-other)
      (widget-insert "\n")
      (nnmairix-widget-add "Threads" 'checkbox nil))
      (widget-insert " Show full threads\n\n")))

(defun nnmairix-widget-build-editable-fields (values)
  "Build editable field widgets in `nnmairix-widget-fields-list'.
VALUES may contain values for editable fields from current article."
  ;; how can this be done less ugly?
  (let ((ret))
    (mapc
     (function
      (lambda (field)
	(setq field (car (cddr field)))
	(setq ret
	      (nconc
	       (list
		(list
		 (concat "c" field)
		 (widget-create 'checkbox
				:tag field
				:notify (lambda (widget &rest ignore)
					  (nnmairix-widget-toggle-activate widget))
				nil)))
	       (list
		(list
		 (concat "e" field)
		 (widget-create 'editable-field
				:size 60
				:format (concat " " field ":"
						(make-string (- 11 (length field)) ?\ )
						"%v")
				:value (or (cadr (assoc field values)) ""))))
	       ret))
	(widget-insert "\n")
	;; Deactivate editable field
	(widget-apply (cadr (nth 1 ret)) :deactivate)))
     nnmairix-widget-fields-list)
    ret))

(defun nnmairix-widget-add (name &rest args)
  "Add a widget NAME with optional ARGS."
  (push
   (list name
	 (apply 'widget-create args))
   nnmairix-widgets))

(defun nnmairix-widget-toggle-activate (widget)
  "Toggle activation status of WIDGET depending on corresponding checkbox value."
  (let ((field (widget-get widget :tag)))
    (if (widget-value widget)
	(widget-apply
	 (cadr (assoc (concat "e" field) nnmairix-widgets))
	 :activate)
      (widget-apply
       (cadr (assoc (concat "e" field) nnmairix-widgets))
       :deactivate)))
  (widget-setup))

(provide 'nnmairix)

;;; nnmairix.el ends here