summaryrefslogtreecommitdiff
path: root/lisp/gnus/nnml.el
blob: 2cc8023366b6036b2d1d85390c894b43d431c31e (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
;;; nnml.el --- mail spool access for Gnus

;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
;;   2004, 2005, 2006 Free Software Foundation, Inc.

;; Author: Simon Josefsson <simon@josefsson.org> (adding MARKS)
;;      Lars Magne Ingebrigtsen <larsi@gnus.org>
;;	Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
;; Keywords: news, mail

;; 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 2, 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; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:

;; Based on nnspool.el by Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>.
;; For an overview of what the interface functions do, please see the
;; Gnus sources.

;;; Code:

(require 'gnus)
(require 'nnheader)
(require 'nnmail)
(require 'nnoo)
(eval-when-compile (require 'cl))

(eval-and-compile
  (autoload 'gnus-article-unpropagatable-p "gnus-sum"))

(nnoo-declare nnml)

(defvoo nnml-directory message-directory
  "Spool directory for the nnml mail backend.")

(defvoo nnml-active-file
    (expand-file-name "active" nnml-directory)
  "Mail active file.")

(defvoo nnml-newsgroups-file
    (expand-file-name "newsgroups" nnml-directory)
  "Mail newsgroups description file.")

(defvoo nnml-get-new-mail t
  "If non-nil, nnml will check the incoming mail file and split the mail.")

(defvoo nnml-nov-is-evil nil
  "If non-nil, Gnus will never generate and use nov databases for mail spools.
Using nov databases will speed up header fetching considerably.
This variable shouldn't be flipped much.  If you have, for some reason,
set this to t, and want to set it to nil again, you should always run
the `nnml-generate-nov-databases' command.  The function will go
through all nnml directories and generate nov databases for them
all.  This may very well take some time.")

(defvoo nnml-marks-is-evil nil
  "If non-nil, Gnus will never generate and use marks file for mail spools.
Using marks files makes it possible to backup and restore mail groups
separately from `.newsrc.eld'.  If you have, for some reason, set this
to t, and want to set it to nil again, you should always remove the
corresponding marks file (usually named `.marks' in the nnml group
directory, but see `nnml-marks-file-name') for the group.  Then the
marks file will be regenerated properly by Gnus.")

(defvoo nnml-prepare-save-mail-hook nil
  "Hook run narrowed to an article before saving.")

(defvoo nnml-inhibit-expiry nil
  "If non-nil, inhibit expiry.")

(defvoo nnml-use-compressed-files nil
  "If non-nil, allow using compressed message files.")



(defconst nnml-version "nnml 1.0"
  "nnml version.")

(defvoo nnml-nov-file-name ".overview")
(defvoo nnml-marks-file-name ".marks")

(defvoo nnml-current-directory nil)
(defvoo nnml-current-group nil)
(defvoo nnml-status-string "")
(defvoo nnml-nov-buffer-alist nil)
(defvoo nnml-group-alist nil)
(defvoo nnml-active-timestamp nil)
(defvoo nnml-article-file-alist nil)

(defvoo nnml-generate-active-function 'nnml-generate-active-info)

(defvar nnml-nov-buffer-file-name nil)

(defvoo nnml-file-coding-system nnmail-file-coding-system)

(defvoo nnml-marks nil)

(defvar nnml-marks-modtime (gnus-make-hashtable))


;;; Interface functions.

(nnoo-define-basics nnml)

(deffoo nnml-retrieve-headers (sequence &optional group server fetch-old)
  (when (nnml-possibly-change-directory group server)
    (save-excursion
      (set-buffer nntp-server-buffer)
      (erase-buffer)
      (let* ((file nil)
	     (number (length sequence))
	     (count 0)
	     (file-name-coding-system nnmail-pathname-coding-system)
	     beg article)
	(if (stringp (car sequence))
	    'headers
	  (if (nnml-retrieve-headers-with-nov sequence fetch-old)
	      'nov
	    (while sequence
	      (setq article (car sequence))
	      (setq file (nnml-article-to-file article))
	      (when (and file
			 (file-exists-p file)
			 (not (file-directory-p file)))
		(insert (format "221 %d Article retrieved.\n" article))
		(setq beg (point))
		(nnheader-insert-head file)
		(goto-char beg)
		(if (re-search-forward "\n\r?\n" nil t)
		    (forward-char -1)
		  (goto-char (point-max))
		  (insert "\n\n"))
		(insert ".\n")
		(delete-region (point) (point-max)))
	      (setq sequence (cdr sequence))
	      (setq count (1+ count))
	      (and (numberp nnmail-large-newsgroup)
		   (> number nnmail-large-newsgroup)
		   (zerop (% count 20))
		   (nnheader-message 6 "nnml: Receiving headers... %d%%"
				     (/ (* count 100) number))))

	    (and (numberp nnmail-large-newsgroup)
		 (> number nnmail-large-newsgroup)
		 (nnheader-message 6 "nnml: Receiving headers...done"))

	    (nnheader-fold-continuation-lines)
	    'headers))))))

(deffoo nnml-open-server (server &optional defs)
  (nnoo-change-server 'nnml server defs)
  (when (not (file-exists-p nnml-directory))
    (ignore-errors (make-directory nnml-directory t)))
  (cond
   ((not (file-exists-p nnml-directory))
    (nnml-close-server)
    (nnheader-report 'nnml "Couldn't create directory: %s" nnml-directory))
   ((not (file-directory-p (file-truename nnml-directory)))
    (nnml-close-server)
    (nnheader-report 'nnml "Not a directory: %s" nnml-directory))
   (t
    (nnheader-report 'nnml "Opened server %s using directory %s"
		     server nnml-directory)
    t)))

(deffoo nnml-request-regenerate (server)
  (nnml-possibly-change-directory nil server)
  (nnml-generate-nov-databases server)
  t)

(deffoo nnml-request-article (id &optional group server buffer)
  (nnml-possibly-change-directory group server)
  (let* ((nntp-server-buffer (or buffer nntp-server-buffer))
	 (file-name-coding-system nnmail-pathname-coding-system)
	 path gpath group-num)
    (if (stringp id)
	(when (and (setq group-num (nnml-find-group-number id))
		   (cdr
		    (assq (cdr group-num)
			  (nnheader-article-to-file-alist
			   (setq gpath
				 (nnmail-group-pathname
				  (car group-num)
				  nnml-directory))))))
	  (setq path (concat gpath (int-to-string (cdr group-num)))))
      (setq path (nnml-article-to-file id)))
    (cond
     ((not path)
      (nnheader-report 'nnml "No such article: %s" id))
     ((not (file-exists-p path))
      (nnheader-report 'nnml "No such file: %s" path))
     ((file-directory-p path)
      (nnheader-report 'nnml "File is a directory: %s" path))
     ((not (save-excursion (let ((nnmail-file-coding-system
				  nnml-file-coding-system))
			     (nnmail-find-file path))))
      (nnheader-report 'nnml "Couldn't read file: %s" path))
     (t
      (nnheader-report 'nnml "Article %s retrieved" id)
      ;; We return the article number.
      (cons (if group-num (car group-num) group)
	    (string-to-number (file-name-nondirectory path)))))))

(deffoo nnml-request-group (group &optional server dont-check)
  (let ((file-name-coding-system nnmail-pathname-coding-system))
    (cond
     ((not (nnml-possibly-change-directory group server))
      (nnheader-report 'nnml "Invalid group (no such directory)"))
     ((not (file-exists-p nnml-current-directory))
      (nnheader-report 'nnml "Directory %s does not exist"
		       nnml-current-directory))
     ((not (file-directory-p nnml-current-directory))
      (nnheader-report 'nnml "%s is not a directory" nnml-current-directory))
     (dont-check
      (nnheader-report 'nnml "Group %s selected" group)
      t)
     (t
      (nnheader-re-read-dir nnml-current-directory)
      (nnmail-activate 'nnml)
      (let ((active (nth 1 (assoc group nnml-group-alist))))
	(if (not active)
	    (nnheader-report 'nnml "No such group: %s" group)
	  (nnheader-report 'nnml "Selected group %s" group)
	  (nnheader-insert "211 %d %d %d %s\n"
			   (max (1+ (- (cdr active) (car active))) 0)
			   (car active) (cdr active) group)))))))

(deffoo nnml-request-scan (&optional group server)
  (setq nnml-article-file-alist nil)
  (nnml-possibly-change-directory group server)
  (nnmail-get-new-mail 'nnml 'nnml-save-nov nnml-directory group))

(deffoo nnml-close-group (group &optional server)
  (setq nnml-article-file-alist nil)
  t)

(deffoo nnml-request-create-group (group &optional server args)
  (nnml-possibly-change-directory nil server)
  (nnmail-activate 'nnml)
  (cond
   ((assoc group nnml-group-alist)
    t)
   ((and (file-exists-p (nnmail-group-pathname group nnml-directory))
	 (not (file-directory-p (nnmail-group-pathname group nnml-directory))))
    (nnheader-report 'nnml "%s is a file"
		     (nnmail-group-pathname group nnml-directory)))
   (t
    (let (active)
      (push (list group (setq active (cons 1 0)))
	    nnml-group-alist)
      (nnml-possibly-create-directory group)
      (nnml-possibly-change-directory group server)
      (let ((articles (nnml-directory-articles nnml-current-directory)))
	(when articles
	  (setcar active (apply 'min articles))
	  (setcdr active (apply 'max articles))))
      (nnmail-save-active nnml-group-alist nnml-active-file)
      t))))

(deffoo nnml-request-list (&optional server)
  (save-excursion
    (let ((nnmail-file-coding-system nnmail-active-file-coding-system)
	  (file-name-coding-system nnmail-pathname-coding-system))
      (nnmail-find-file nnml-active-file))
    (setq nnml-group-alist (nnmail-get-active))
    t))

(deffoo nnml-request-newgroups (date &optional server)
  (nnml-request-list server))

(deffoo nnml-request-list-newsgroups (&optional server)
  (save-excursion
    (nnmail-find-file nnml-newsgroups-file)))

(deffoo nnml-request-expire-articles (articles group &optional server force)
  (nnml-possibly-change-directory group server)
  (let ((active-articles
	 (nnml-directory-articles nnml-current-directory))
	(is-old t)
	article rest mod-time number)
    (nnmail-activate 'nnml)

    (setq active-articles (sort active-articles '<))
    ;; Articles not listed in active-articles are already gone,
    ;; so don't try to expire them.
    (setq articles (gnus-sorted-intersection articles active-articles))

    (while (and articles is-old)
      (if (and (setq article (nnml-article-to-file
			      (setq number (pop articles))))
	       (setq mod-time (nth 5 (file-attributes article)))
	       (nnml-deletable-article-p group number)
	       (setq is-old (nnmail-expired-article-p group mod-time force
						      nnml-inhibit-expiry)))
	  (progn
	    ;; Allow a special target group.
	    (unless (eq nnmail-expiry-target 'delete)
	      (with-temp-buffer
		(nnml-request-article number group server (current-buffer))
		(let (nnml-current-directory
		      nnml-current-group
		      nnml-article-file-alist)
		  (nnmail-expiry-target-group nnmail-expiry-target group)))
	      ;; Maybe directory is changed during nnmail-expiry-target-group.
	      (nnml-possibly-change-directory group server))
	    (nnheader-message 5 "Deleting article %s in %s"
			      number group)
	    (condition-case ()
		(funcall nnmail-delete-file-function article)
	      (file-error
	       (push number rest)))
	    (setq active-articles (delq number active-articles))
	    (nnml-nov-delete-article group number))
	(push number rest)))
    (let ((active (nth 1 (assoc group nnml-group-alist))))
      (when active
	(setcar active (or (and active-articles
				(apply 'min active-articles))
			   (1+ (cdr active)))))
      (nnmail-save-active nnml-group-alist nnml-active-file))
    (nnml-save-nov)
    (nconc rest articles)))

(deffoo nnml-request-move-article
    (article group server accept-form &optional last)
  (let ((buf (get-buffer-create " *nnml move*"))
	result)
    (nnml-possibly-change-directory group server)
    (nnml-update-file-alist)
    (and
     (nnml-deletable-article-p group article)
     (nnml-request-article article group server)
     (let (nnml-current-directory
	   nnml-current-group
	   nnml-article-file-alist)
       (save-excursion
	 (set-buffer buf)
	 (insert-buffer-substring nntp-server-buffer)
	 (setq result (eval accept-form))
	 (kill-buffer (current-buffer))
	 result))
     (progn
       (nnml-possibly-change-directory group server)
       (condition-case ()
	   (funcall nnmail-delete-file-function
		    (nnml-article-to-file  article))
	 (file-error nil))
       (nnml-nov-delete-article group article)
       (when last
	 (nnml-save-nov)
	 (nnmail-save-active nnml-group-alist nnml-active-file))))
    result))

(deffoo nnml-request-accept-article (group &optional server last)
  (nnml-possibly-change-directory group server)
  (nnmail-check-syntax)
  (let (result)
    (when nnmail-cache-accepted-message-ids
      (nnmail-cache-insert (nnmail-fetch-field "message-id") 
			   group
			   (nnmail-fetch-field "subject")
			   (nnmail-fetch-field "from")))
    (if (stringp group)
	(and
	 (nnmail-activate 'nnml)
	 (setq result (car (nnml-save-mail
			    (list (cons group (nnml-active-number group))))))
	 (progn
	   (nnmail-save-active nnml-group-alist nnml-active-file)
	   (and last (nnml-save-nov))))
      (and
       (nnmail-activate 'nnml)
       (if (and (not (setq result (nnmail-article-group 'nnml-active-number)))
		(yes-or-no-p "Moved to `junk' group; delete article? "))
	   (setq result 'junk)
	 (setq result (car (nnml-save-mail result))))
       (when last
	 (nnmail-save-active nnml-group-alist nnml-active-file)
	 (when nnmail-cache-accepted-message-ids
	   (nnmail-cache-close))
	 (nnml-save-nov))))
    result))

(deffoo nnml-request-post (&optional server)
  (nnmail-do-request-post 'nnml-request-accept-article server))

(deffoo nnml-request-replace-article (article group buffer)
  (nnml-possibly-change-directory group)
  (save-excursion
    (set-buffer buffer)
    (nnml-possibly-create-directory group)
    (let ((chars (nnmail-insert-lines))
	  (art (concat (int-to-string article) "\t"))
	  headers)
      (when (ignore-errors
	      (nnmail-write-region
	       (point-min) (point-max)
	       (or (nnml-article-to-file article)
		   (expand-file-name (int-to-string article)
				     nnml-current-directory))
	       nil (if (nnheader-be-verbose 5) nil 'nomesg))
	      t)
	(setq headers (nnml-parse-head chars article))
	;; Replace the NOV line in the NOV file.
	(save-excursion
	  (set-buffer (nnml-open-nov group))
	  (goto-char (point-min))
	  (if (or (looking-at art)
		  (search-forward (concat "\n" art) nil t))
	      ;; Delete the old NOV line.
	      (gnus-delete-line)
	    ;; The line isn't here, so we have to find out where
	    ;; we should insert it.  (This situation should never
	    ;; occur, but one likes to make sure...)
	    (while (and (looking-at "[0-9]+\t")
			(< (string-to-number
			    (buffer-substring
			     (match-beginning 0) (match-end 0)))
			   article)
			(zerop (forward-line 1)))))
	  (beginning-of-line)
	  (nnheader-insert-nov headers)
	  (nnml-save-nov)
	  t)))))

(deffoo nnml-request-delete-group (group &optional force server)
  (nnml-possibly-change-directory group server)
  (when force
    ;; Delete all articles in GROUP.
    (let ((articles
	   (directory-files
	    nnml-current-directory t
	    (concat nnheader-numerical-short-files
		    "\\|" (regexp-quote nnml-nov-file-name) "$"
		    "\\|" (regexp-quote nnml-marks-file-name) "$")))
	  article)
      (while articles
	(setq article (pop articles))
	(when (file-writable-p article)
	  (nnheader-message 5 "Deleting article %s in %s..." article group)
	  (funcall nnmail-delete-file-function article))))
    ;; Try to delete the directory itself.
    (ignore-errors (delete-directory nnml-current-directory)))
  ;; Remove the group from all structures.
  (setq nnml-group-alist
	(delq (assoc group nnml-group-alist) nnml-group-alist)
	nnml-current-group nil
	nnml-current-directory nil)
  ;; Save the active file.
  (nnmail-save-active nnml-group-alist nnml-active-file)
  t)

(deffoo nnml-request-rename-group (group new-name &optional server)
  (nnml-possibly-change-directory group server)
  (let ((new-dir (nnmail-group-pathname new-name nnml-directory))
	(old-dir (nnmail-group-pathname group nnml-directory)))
    (when (ignore-errors
	    (make-directory new-dir t)
	    t)
      ;; We move the articles file by file instead of renaming
      ;; the directory -- there may be subgroups in this group.
      ;; One might be more clever, I guess.
      (let ((files (nnheader-article-to-file-alist old-dir)))
	(while files
	  (rename-file
	   (concat old-dir (cdar files))
	   (concat new-dir (cdar files)))
	  (pop files)))
      ;; Move .overview file.
      (let ((overview (concat old-dir nnml-nov-file-name)))
	(when (file-exists-p overview)
	  (rename-file overview (concat new-dir nnml-nov-file-name))))
      ;; Move .marks file.
      (let ((marks (concat old-dir nnml-marks-file-name)))
	(when (file-exists-p marks)
	  (rename-file marks (concat new-dir nnml-marks-file-name))))
      (when (<= (length (directory-files old-dir)) 2)
	(ignore-errors (delete-directory old-dir)))
      ;; That went ok, so we change the internal structures.
      (let ((entry (assoc group nnml-group-alist)))
	(when entry
	  (setcar entry new-name))
	(setq nnml-current-directory nil
	      nnml-current-group nil)
	;; Save the new group alist.
	(nnmail-save-active nnml-group-alist nnml-active-file)
	t))))

(deffoo nnml-set-status (article name value &optional group server)
  (nnml-possibly-change-directory group server)
  (let ((file (nnml-article-to-file article)))
    (cond
     ((not (file-exists-p file))
      (nnheader-report 'nnml "File %s does not exist" file))
     (t
      (with-temp-file file
	(nnheader-insert-file-contents file)
	(nnmail-replace-status name value))
      t))))


;;; Internal functions.

(defun nnml-article-to-file (article)
  (nnml-update-file-alist)
  (let (file)
    (if (setq file
	      (if nnml-use-compressed-files
		  (cdr (assq article nnml-article-file-alist))
		(number-to-string article)))
	(expand-file-name file nnml-current-directory)
      (when (not nnheader-directory-files-is-safe)
	;; Just to make sure nothing went wrong when reading over NFS --
	;; check once more.
	(when (file-exists-p
	       (setq file (expand-file-name (number-to-string article)
					    nnml-current-directory)))
	  (nnml-update-file-alist t)
	  file)))))

(defun nnml-deletable-article-p (group article)
  "Say whether ARTICLE in GROUP can be deleted."
  (let (path)
    (when (setq path (nnml-article-to-file article))
      (when (file-writable-p path)
	(or (not nnmail-keep-last-article)
	    (not (eq (cdr (nth 1 (assoc group nnml-group-alist)))
		     article)))))))

;; Find an article number in the current group given the Message-ID.
(defun nnml-find-group-number (id)
  (save-excursion
    (set-buffer (get-buffer-create " *nnml id*"))
    (let ((alist nnml-group-alist)
	  number)
      ;; We want to look through all .overview files, but we want to
      ;; start with the one in the current directory.  It seems most
      ;; likely that the article we are looking for is in that group.
      (if (setq number (nnml-find-id nnml-current-group id))
	  (cons nnml-current-group number)
      ;; It wasn't there, so we look through the other groups as well.
	(while (and (not number)
		    alist)
	  (or (string= (caar alist) nnml-current-group)
	      (setq number (nnml-find-id (caar alist) id)))
	  (or number
	      (setq alist (cdr alist))))
	(and number
	     (cons (caar alist) number))))))

(defun nnml-find-id (group id)
  (erase-buffer)
  (let ((nov (expand-file-name nnml-nov-file-name
			       (nnmail-group-pathname group nnml-directory)))
	number found)
    (when (file-exists-p nov)
      (nnheader-insert-file-contents nov)
      (while (and (not found)
		  (search-forward id nil t)) ; We find the ID.
	;; And the id is in the fourth field.
	(if (not (and (search-backward "\t" nil t 4)
		      (not (search-backward"\t" (gnus-point-at-bol) t))))
	    (forward-line 1)
	  (beginning-of-line)
	  (setq found t)
	  ;; We return the article number.
	  (setq number
		(ignore-errors (read (current-buffer))))))
      number)))

(defun nnml-retrieve-headers-with-nov (articles &optional fetch-old)
  (if (or gnus-nov-is-evil nnml-nov-is-evil)
      nil
    (let ((nov (expand-file-name nnml-nov-file-name nnml-current-directory)))
      (when (file-exists-p nov)
	(save-excursion
	  (set-buffer nntp-server-buffer)
	  (erase-buffer)
	  (nnheader-insert-file-contents nov)
	  (if (and fetch-old
		   (not (numberp fetch-old)))
	      t				; Don't remove anything.
	    (nnheader-nov-delete-outside-range
	     (if fetch-old (max 1 (- (car articles) fetch-old))
	       (car articles))
	     (car (last articles)))
	    t))))))

(defun nnml-possibly-change-directory (group &optional server)
  (when (and server
	     (not (nnml-server-opened server)))
    (nnml-open-server server))
  (if (not group)
      t
    (let ((pathname (nnmail-group-pathname group nnml-directory))
	  (file-name-coding-system nnmail-pathname-coding-system))
      (when (not (equal pathname nnml-current-directory))
	(setq nnml-current-directory pathname
	      nnml-current-group group
	      nnml-article-file-alist nil))
      (file-exists-p nnml-current-directory))))

(defun nnml-possibly-create-directory (group)
  (let ((dir (nnmail-group-pathname group nnml-directory)))
    (unless (file-exists-p dir)
      (make-directory (directory-file-name dir) t)
      (nnheader-message 5 "Creating mail directory %s" dir))))

(defun nnml-save-mail (group-art)
  "Called narrowed to an article."
  (let (chars headers extension)
    (setq chars (nnmail-insert-lines))
    (setq extension
         (and nnml-use-compressed-files
              (> chars 1000)
              ".gz"))
    (nnmail-insert-xref group-art)
    (run-hooks 'nnmail-prepare-save-mail-hook)
    (run-hooks 'nnml-prepare-save-mail-hook)
    (goto-char (point-min))
    (while (looking-at "From ")
      (replace-match "X-From-Line: ")
      (forward-line 1))
    ;; We save the article in all the groups it belongs in.
    (let ((ga group-art)
	  first)
      (while ga
	(nnml-possibly-create-directory (caar ga))
	(let ((file (concat (nnmail-group-pathname
			     (caar ga) nnml-directory)
			    (int-to-string (cdar ga))
			    extension)))
	  (if first
	      ;; It was already saved, so we just make a hard link.
	      (funcall nnmail-crosspost-link-function first file t)
	    ;; Save the article.
	    (nnmail-write-region (point-min) (point-max) file nil
				 (if (nnheader-be-verbose 5) nil 'nomesg))
	    (setq first file)))
	(setq ga (cdr ga))))
    ;; Generate a nov line for this article.  We generate the nov
    ;; line after saving, because nov generation destroys the
    ;; header.
    (setq headers (nnml-parse-head chars))
    ;; Output the nov line to all nov databases that should have it.
    (let ((ga group-art))
      (while ga
	(nnml-add-nov (caar ga) (cdar ga) headers)
	(setq ga (cdr ga))))
    group-art))

(defun nnml-active-number (group)
  "Compute the next article number in GROUP."
  (let ((active (cadr (assoc group nnml-group-alist))))
    ;; The group wasn't known to nnml, so we just create an active
    ;; entry for it.
    (unless active
      ;; Perhaps the active file was corrupt?  See whether
      ;; there are any articles in this group.
      (nnml-possibly-create-directory group)
      (nnml-possibly-change-directory group)
      (unless nnml-article-file-alist
	(setq nnml-article-file-alist
	      (sort
	       (nnml-current-group-article-to-file-alist)
	       'car-less-than-car)))
      (setq active
	    (if nnml-article-file-alist
		(cons (caar nnml-article-file-alist)
		      (caar (last nnml-article-file-alist)))
	      (cons 1 0)))
      (push (list group active) nnml-group-alist))
    (setcdr active (1+ (cdr active)))
    (while (file-exists-p
	    (expand-file-name (int-to-string (cdr active))
			      (nnmail-group-pathname group nnml-directory)))
      (setcdr active (1+ (cdr active))))
    (cdr active)))

(defun nnml-add-nov (group article headers)
  "Add a nov line for the GROUP base."
  (save-excursion
    (set-buffer (nnml-open-nov group))
    (goto-char (point-max))
    (mail-header-set-number headers article)
    (nnheader-insert-nov headers)))

(defsubst nnml-header-value ()
  (buffer-substring (match-end 0) (gnus-point-at-eol)))

(defun nnml-parse-head (chars &optional number)
  "Parse the head of the current buffer."
  (save-excursion
    (save-restriction
      (unless (zerop (buffer-size))
	(narrow-to-region
	 (goto-char (point-min))
	 (if (re-search-forward "\n\r?\n" nil t)
	     (1- (point))
	   (point-max))))
      (let ((headers (nnheader-parse-naked-head)))
	(mail-header-set-chars headers chars)
	(mail-header-set-number headers number)
	headers))))

(defun nnml-get-nov-buffer (group)
  (let ((buffer (get-buffer-create (format " *nnml overview %s*" group))))
    (save-excursion
      (set-buffer buffer)
      (set (make-local-variable 'nnml-nov-buffer-file-name)
	   (expand-file-name
	    nnml-nov-file-name
	    (nnmail-group-pathname group nnml-directory)))
      (erase-buffer)
      (when (file-exists-p nnml-nov-buffer-file-name)
	(nnheader-insert-file-contents nnml-nov-buffer-file-name)))
    buffer))

(defun nnml-open-nov (group)
  (or (cdr (assoc group nnml-nov-buffer-alist))
      (let ((buffer (nnml-get-nov-buffer group)))
	(push (cons group buffer) nnml-nov-buffer-alist)
	buffer)))

(defun nnml-save-nov ()
  (save-excursion
    (while nnml-nov-buffer-alist
      (when (buffer-name (cdar nnml-nov-buffer-alist))
	(set-buffer (cdar nnml-nov-buffer-alist))
	(when (buffer-modified-p)
	  (nnmail-write-region (point-min) (point-max)
			       nnml-nov-buffer-file-name nil 'nomesg))
	(set-buffer-modified-p nil)
	(kill-buffer (current-buffer)))
      (setq nnml-nov-buffer-alist (cdr nnml-nov-buffer-alist)))))

;;;###autoload
(defun nnml-generate-nov-databases (&optional server)
  "Generate NOV databases in all nnml directories."
  (interactive (list (or (nnoo-current-server 'nnml) "")))
  ;; Read the active file to make sure we don't re-use articles
  ;; numbers in empty groups.
  (nnmail-activate 'nnml)
  (unless (nnml-server-opened server)
    (nnml-open-server server))
  (setq nnml-directory (expand-file-name nnml-directory))
  ;; Recurse down the directories.
  (nnml-generate-nov-databases-1 nnml-directory nil t)
  ;; Save the active file.
  (nnmail-save-active nnml-group-alist nnml-active-file))

(defun nnml-generate-nov-databases-1 (dir &optional seen no-active)
  "Regenerate the NOV database in DIR."
  (interactive "DRegenerate NOV in: ")
  (setq dir (file-name-as-directory dir))
  ;; Only scan this sub-tree if we haven't been here yet.
  (unless (member (file-truename dir) seen)
    (push (file-truename dir) seen)
    ;; We descend recursively
    (let ((dirs (directory-files dir t nil t))
	  dir)
      (while (setq dir (pop dirs))
	(when (and (not (string-match "^\\." (file-name-nondirectory dir)))
		   (file-directory-p dir))
	  (nnml-generate-nov-databases-1 dir seen))))
    ;; Do this directory.
    (let ((files (sort (nnheader-article-to-file-alist dir)
		       'car-less-than-car)))
      (if (not files)
	  (let* ((group (nnheader-file-to-group
			 (directory-file-name dir) nnml-directory))
		 (info (cadr (assoc group nnml-group-alist))))
	    (when info
	      (setcar info (1+ (cdr info)))))
	(funcall nnml-generate-active-function dir)
	;; Generate the nov file.
	(nnml-generate-nov-file dir files)
	(unless no-active
	  (nnmail-save-active nnml-group-alist nnml-active-file))))))

(eval-when-compile (defvar files))
(defun nnml-generate-active-info (dir)
  ;; Update the active info for this group.
  (let* ((group (nnheader-file-to-group
		 (directory-file-name dir) nnml-directory))
	 (entry (assoc group nnml-group-alist))
	 (last (or (caadr entry) 0)))
    (setq nnml-group-alist (delq entry nnml-group-alist))
    (push (list group
		(cons (or (caar files) (1+ last))
		      (max last
			   (or (let ((f files))
				 (while (cdr f) (setq f (cdr f)))
				 (caar f))
			       0))))
	  nnml-group-alist)))

(defun nnml-generate-nov-file (dir files)
  (let* ((dir (file-name-as-directory dir))
	 (nov (concat dir nnml-nov-file-name))
	 (nov-buffer (get-buffer-create " *nov*"))
	 chars file headers)
    (save-excursion
      ;; Init the nov buffer.
      (set-buffer nov-buffer)
      (buffer-disable-undo)
      (erase-buffer)
      (set-buffer nntp-server-buffer)
      ;; Delete the old NOV file.
      (when (file-exists-p nov)
	(funcall nnmail-delete-file-function nov))
      (while files
	(unless (file-directory-p (setq file (concat dir (cdar files))))
	  (erase-buffer)
	  (nnheader-insert-file-contents file)
	  (narrow-to-region
	   (goto-char (point-min))
	   (progn
	     (re-search-forward "\n\r?\n" nil t)
	     (setq chars (- (point-max) (point)))
	     (max (point-min) (1- (point)))))
	  (unless (zerop (buffer-size))
	    (goto-char (point-min))
	    (setq headers (nnml-parse-head chars (caar files)))
	    (save-excursion
	      (set-buffer nov-buffer)
	      (goto-char (point-max))
	      (nnheader-insert-nov headers)))
	  (widen))
	(setq files (cdr files)))
      (save-excursion
	(set-buffer nov-buffer)
	(nnmail-write-region (point-min) (point-max) nov nil 'nomesg)
	(kill-buffer (current-buffer))))))

(defun nnml-nov-delete-article (group article)
  (save-excursion
    (set-buffer (nnml-open-nov group))
    (when (nnheader-find-nov-line article)
      (delete-region (point) (progn (forward-line 1) (point)))
      (when (bobp)
	(let ((active (cadr (assoc group nnml-group-alist)))
	      num)
	  (when active
	    (if (eobp)
		(setf (car active) (1+ (cdr active)))
	      (when (and (setq num (ignore-errors (read (current-buffer))))
			 (numberp num))
		(setf (car active) num)))))))
    t))

(defun nnml-update-file-alist (&optional force)
  (when nnml-use-compressed-files
    (when (or (not nnml-article-file-alist)
	      force)
      (setq nnml-article-file-alist
	    (nnml-current-group-article-to-file-alist)))))

(defun nnml-directory-articles (dir)
  "Return a list of all article files in a directory.
Use the nov database for that directory if available."
  (if (or gnus-nov-is-evil nnml-nov-is-evil
	  (not (file-exists-p
		(expand-file-name nnml-nov-file-name dir))))
      (nnheader-directory-articles dir)
    ;; build list from .overview if available
    ;; We would use nnml-open-nov, except that nnml-nov-buffer-alist is
    ;; defvoo'd, and we might get called when it hasn't been swapped in.
    (save-excursion
      (let ((list nil)
	    art
	    (buffer (nnml-get-nov-buffer nnml-current-group)))
	(set-buffer buffer)
	(goto-char (point-min))
	(while (not (eobp))
	  (setq art (read (current-buffer)))
	  (push art list)
	  (forward-line 1))
	list))))

(defun nnml-current-group-article-to-file-alist ()
  "Return an alist of article/file pairs in the current group.
Use the nov database for the current group if available."
  (if (or nnml-use-compressed-files
	  gnus-nov-is-evil
	  nnml-nov-is-evil
	  (not (file-exists-p
		(expand-file-name nnml-nov-file-name
				  nnml-current-directory))))
      (nnheader-article-to-file-alist nnml-current-directory)
    ;; build list from .overview if available
    (save-excursion
      (let ((alist nil)
	    (buffer (nnml-get-nov-buffer nnml-current-group))
	    art)
	(set-buffer buffer)
	(goto-char (point-min))
	(while (not (eobp))
	  (setq art (read (current-buffer)))
	  ;; assume file name is unadorned (ie. not compressed etc)
	  (push (cons art (int-to-string art)) alist)
	  (forward-line 1))
	alist))))

(deffoo nnml-request-set-mark (group actions &optional server)
  (nnml-possibly-change-directory group server)
  (unless nnml-marks-is-evil
    (nnml-open-marks group server)
    (dolist (action actions)
      (let ((range (nth 0 action))
	    (what  (nth 1 action))
	    (marks (nth 2 action)))
	(assert (or (eq what 'add) (eq what 'del)) nil
		"Unknown request-set-mark action: %s" what)
	(dolist (mark marks)
	  (setq nnml-marks (gnus-update-alist-soft
			    mark
			    (funcall (if (eq what 'add) 'gnus-range-add
				       'gnus-remove-from-range)
				     (cdr (assoc mark nnml-marks)) range)
			    nnml-marks)))))
    (nnml-save-marks group server))
  nil)

(deffoo nnml-request-update-info (group info &optional server)
  (nnml-possibly-change-directory group server)
  (when (and (not nnml-marks-is-evil) (nnml-marks-changed-p group))
    (nnheader-message 8 "Updating marks for %s..." group)
    (nnml-open-marks group server)
    ;; Update info using `nnml-marks'.
    (mapcar (lambda (pred)
	      (unless (memq (cdr pred) gnus-article-unpropagated-mark-lists)
		(gnus-info-set-marks
		 info
		 (gnus-update-alist-soft
		  (cdr pred)
		  (cdr (assq (cdr pred) nnml-marks))
		  (gnus-info-marks info))
		 t)))
	    gnus-article-mark-lists)
    (let ((seen (cdr (assq 'read nnml-marks))))
      (gnus-info-set-read info
			  (if (and (integerp (car seen))
				   (null (cdr seen)))
			      (list (cons (car seen) (car seen)))
			    seen)))
    (nnheader-message 8 "Updating marks for %s...done" group))
  info)

(defun nnml-marks-changed-p (group)
  (let ((file (expand-file-name nnml-marks-file-name
				(nnmail-group-pathname group nnml-directory))))
    (if (null (gnus-gethash file nnml-marks-modtime))
	t ;; never looked at marks file, assume it has changed
      (not (equal (gnus-gethash file nnml-marks-modtime)
		  (nth 5 (file-attributes file)))))))

(defun nnml-save-marks (group server)
  (let ((file-name-coding-system nnmail-pathname-coding-system)
	(file (expand-file-name nnml-marks-file-name
				(nnmail-group-pathname group nnml-directory))))
    (condition-case err
	(progn
	  (nnml-possibly-create-directory group)
	  (with-temp-file file
	    (erase-buffer)
	    (gnus-prin1 nnml-marks)
	    (insert "\n"))
	  (gnus-sethash file
			(nth 5 (file-attributes file))
			nnml-marks-modtime))
      (error (or (gnus-yes-or-no-p
		  (format "Could not write to %s (%s).  Continue? " file err))
		 (error "Cannot write to %s (%s)" file err))))))

(defun nnml-open-marks (group server)
  (let ((file (expand-file-name
	       nnml-marks-file-name
	       (nnmail-group-pathname group nnml-directory))))
    (if (file-exists-p file)
	(condition-case err
	    (with-temp-buffer
	      (gnus-sethash file (nth 5 (file-attributes file))
			    nnml-marks-modtime)
	      (nnheader-insert-file-contents file)
	      (setq nnml-marks (read (current-buffer)))
	      (dolist (el gnus-article-unpropagated-mark-lists)
		(setq nnml-marks (gnus-remassoc el nnml-marks))))
	  (error (or (gnus-yes-or-no-p
		      (format "Error reading nnml marks file %s (%s).  Continuing will use marks from .newsrc.eld.  Continue? " file err))
		     (error "Cannot read nnml marks file %s (%s)" file err))))
      ;; User didn't have a .marks file.  Probably first time
      ;; user of the .marks stuff.  Bootstrap it from .newsrc.eld.
      (let ((info (gnus-get-info
		   (gnus-group-prefixed-name
		    group
		    (gnus-server-to-method (format "nnml:%s" server))))))
	(nnheader-message 7 "Bootstrapping marks for %s..." group)
	(setq nnml-marks (gnus-info-marks info))
	(push (cons 'read (gnus-info-read info)) nnml-marks)
	(dolist (el gnus-article-unpropagated-mark-lists)
	  (setq nnml-marks (gnus-remassoc el nnml-marks)))
	(nnml-save-marks group server)
	(nnheader-message 7 "Bootstrapping marks for %s...done" group)))))

(provide 'nnml)

;;; arch-tag: 52c97dc3-9735-45de-b439-9e4d23b52004
;;; nnml.el ends here