Source

gnus / lisp / gnus-cite.el

Full commit
   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
;;; gnus-cite.el --- parse citations in articles for Gnus

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

;; Author: Per Abhiddenware

;; 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:

;;; Code:

(eval-when-compile (require 'cl))

(require 'gnus)
(require 'gnus-range)
(require 'gnus-art)
(require 'message)	; for message-cite-prefix-regexp

;;; Customization:

(defgroup gnus-cite nil
  "Citation."
  :prefix "gnus-cite-"
  :link '(custom-manual "(gnus)Article Highlighting")
  :group 'gnus-article)

(defcustom gnus-cited-opened-text-button-line-format "%(%{[-]%}%)\n"
  "Format of opened cited text buttons."
  :group 'gnus-cite
  :type 'string)

(defcustom gnus-cited-closed-text-button-line-format "%(%{[+]%}%)\n"
  "Format of closed cited text buttons."
  :group 'gnus-cite
  :type 'string)

(defcustom gnus-cited-lines-visible nil
  "The number of lines of hidden cited text to remain visible.
Or a pair (cons) of numbers which are the number of lines at the top
and bottom of the text, respectively, to remain visible."
  :group 'gnus-cite
  :type '(choice (const :tag "none" nil)
		 integer
		 (cons :tag "Top and Bottom" integer integer)))

(defcustom gnus-cite-parse-max-size 25000
  "Maximum article size (in bytes) where parsing citations is allowed.
Set it to nil to parse all articles."
  :group 'gnus-cite
  :type '(choice (const :tag "all" nil)
		 integer))

(defcustom gnus-cite-max-prefix 20
  "Maximum possible length for a citation prefix."
  :group 'gnus-cite
  :type 'integer)

(defcustom gnus-supercite-regexp
  (concat "^\\(" message-cite-prefix-regexp "\\)? *"
	  ">>>>> +\"\\([^\"\n]+\\)\" +==")
  "*Regexp matching normal Supercite attribution lines.
The first grouping must match prefixes added by other packages."
  :group 'gnus-cite
  :type 'regexp)

(defcustom gnus-supercite-secondary-regexp "^.*\"\\([^\"\n]+\\)\" +=="
  "Regexp matching mangled Supercite attribution lines.
The first regexp group should match the Supercite attribution."
  :group 'gnus-cite
  :type 'regexp)

(defcustom gnus-cite-minimum-match-count 2
  "Minimum number of identical prefixes before we believe it's a citation."
  :group 'gnus-cite
  :type 'integer)

;; Some Microsoft products put in a citation that extends to the
;; remainder of the message:
;;
;;     -----Original Message-----
;;     From: ...
;;     To: ...
;;     Sent: ...   [date, in non-RFC-2822 format]
;;     Subject: ...
;;
;;     Cited message, with no prefixes
;;
;; The four headers are always the same.  But note they are prone to
;; folding without additional indentation.
;;
;; Others use "----- Original Message -----" instead, and properly quote
;; the body using "> ".  This style is handled without special cases.

(defcustom gnus-cite-attribution-prefix
  "In article\\|in <\\|On \\(Mon\\|Tue\\|Wed\\|Thu\\|Fri\\|Sat\\|Sun\\),\\|----- ?Original Message ?-----"
  "*Regexp matching the beginning of an attribution line."
  :group 'gnus-cite
  :type 'regexp)

(defcustom gnus-cite-attribution-suffix
  "\\(\\(wrote\\|writes\\|said\\|says\\|>\\)\\(:\\|\\.\\.\\.\\)\\|----- ?Original Message ?-----\\)[ \t]*$"
  "*Regexp matching the end of an attribution line.
The text matching the first grouping will be used as a button."
  :group 'gnus-cite
  :type 'regexp)

(defcustom gnus-cite-unsightly-citation-regexp
  "^-----Original Message-----\nFrom: \\(.+\n\\)+\n"
  "Regexp matching Microsoft-type rest-of-message citations."
  :version "22.1"
  :group 'gnus-cite
  :type 'regexp)

(defcustom gnus-cite-ignore-quoted-from t
  "Non-nil means don't regard lines beginning with \">From \" as cited text.
Those lines may have been quoted by MTAs in order not to mix up with
the envelope From line."
  :version "22.1"
  :group 'gnus-cite
  :type 'boolean)

(defface gnus-cite-attribution '((t (:italic t)))
  "Face used for attribution lines."
  :group 'gnus-cite)
;; backward-compatibility alias
(put 'gnus-cite-attribution-face 'face-alias 'gnus-cite-attribution)

(defcustom gnus-cite-attribution-face 'gnus-cite-attribution
  "Face used for attribution lines.
It is merged with the face for the cited text belonging to the attribution."
  :version "22.1"
  :group 'gnus-cite
  :type 'face)

(defface gnus-cite-1 '((((class color)
			 (background dark))
			(:foreground "light blue"))
		       (((class color)
			 (background light))
			(:foreground "MidnightBlue"))
		       (t
			(:italic t)))
  "Citation face."
  :group 'gnus-cite)
;; backward-compatibility alias
(put 'gnus-cite-face-1 'face-alias 'gnus-cite-1)

(defface gnus-cite-2 '((((class color)
			 (background dark))
			(:foreground "light cyan"))
		       (((class color)
			 (background light))
			(:foreground "firebrick"))
		       (t
			(:italic t)))
  "Citation face."
  :group 'gnus-cite)
;; backward-compatibility alias
(put 'gnus-cite-face-2 'face-alias 'gnus-cite-2)

(defface gnus-cite-3 '((((class color)
			 (background dark))
			(:foreground "light yellow"))
		       (((class color)
			 (background light))
			(:foreground "dark green"))
		       (t
			(:italic t)))
  "Citation face."
  :group 'gnus-cite)
;; backward-compatibility alias
(put 'gnus-cite-face-3 'face-alias 'gnus-cite-3)

(defface gnus-cite-4 '((((class color)
			 (background dark))
			(:foreground "light pink"))
		       (((class color)
			 (background light))
			(:foreground "OrangeRed"))
		       (t
			(:italic t)))
  "Citation face."
  :group 'gnus-cite)
;; backward-compatibility alias
(put 'gnus-cite-face-4 'face-alias 'gnus-cite-4)

(defface gnus-cite-5 '((((class color)
			 (background dark))
			(:foreground "pale green"))
		       (((class color)
			 (background light))
			(:foreground "dark khaki"))
		       (t
			(:italic t)))
  "Citation face."
  :group 'gnus-cite)
;; backward-compatibility alias
(put 'gnus-cite-face-5 'face-alias 'gnus-cite-5)

(defface gnus-cite-6 '((((class color)
			 (background dark))
			(:foreground "beige"))
		       (((class color)
			 (background light))
			(:foreground "dark violet"))
		       (t
			(:italic t)))
  "Citation face."
  :group 'gnus-cite)
;; backward-compatibility alias
(put 'gnus-cite-face-6 'face-alias 'gnus-cite-6)

(defface gnus-cite-7 '((((class color)
			 (background dark))
			(:foreground "orange"))
		       (((class color)
			 (background light))
			(:foreground "SteelBlue4"))
		       (t
			(:italic t)))
  "Citation face."
  :group 'gnus-cite)
;; backward-compatibility alias
(put 'gnus-cite-face-7 'face-alias 'gnus-cite-7)

(defface gnus-cite-8 '((((class color)
			 (background dark))
			(:foreground "magenta"))
		       (((class color)
			 (background light))
			(:foreground "magenta"))
		       (t
			(:italic t)))
  "Citation face."
  :group 'gnus-cite)
;; backward-compatibility alias
(put 'gnus-cite-face-8 'face-alias 'gnus-cite-8)

(defface gnus-cite-9 '((((class color)
			 (background dark))
			(:foreground "violet"))
		       (((class color)
			 (background light))
			(:foreground "violet"))
		       (t
			(:italic t)))
  "Citation face."
  :group 'gnus-cite)
;; backward-compatibility alias
(put 'gnus-cite-face-9 'face-alias 'gnus-cite-9)

(defface gnus-cite-10 '((((class color)
			  (background dark))
			 (:foreground "medium purple"))
			(((class color)
			  (background light))
			 (:foreground "medium purple"))
			(t
			 (:italic t)))
  "Citation face."
  :group 'gnus-cite)
;; backward-compatibility alias
(put 'gnus-cite-face-10 'face-alias 'gnus-cite-10)

(defface gnus-cite-11 '((((class color)
			  (background dark))
			 (:foreground "turquoise"))
			(((class color)
			  (background light))
			 (:foreground "turquoise"))
			(t
			 (:italic t)))
  "Citation face."
  :group 'gnus-cite)
;; backward-compatibility alias
(put 'gnus-cite-face-11 'face-alias 'gnus-cite-11)

(defcustom gnus-cite-face-list
  '(gnus-cite-1 gnus-cite-2 gnus-cite-3 gnus-cite-4 gnus-cite-5 gnus-cite-6
    gnus-cite-7 gnus-cite-8 gnus-cite-9 gnus-cite-10 gnus-cite-11)
  "*List of faces used for highlighting citations.

When there are citations from multiple articles in the same message,
Gnus will try to give each citation from each article its own face.
This should make it easier to see who wrote what."
  :group 'gnus-cite
  :type '(repeat face))

(defcustom gnus-cite-hide-percentage 50
  "Only hide excess citation if above this percentage of the body."
  :group 'gnus-cite
  :type 'number)

(defcustom gnus-cite-hide-absolute 10
  "Only hide excess citation if above this number of lines in the body."
  :group 'gnus-cite
  :type 'integer)

(defcustom gnus-cite-blank-line-after-header t
  "If non-nil, put a blank line between the citation header and the button."
  :group 'gnus-cite
  :type 'boolean)

;; This has to go here because its default value depends on
;; gnus-cite-face-list.
(defcustom gnus-article-boring-faces (cons 'gnus-signature gnus-cite-face-list)
  "List of faces that are not worth reading.
If an article has more pages below the one you are looking at, but
nothing on those pages is a word of at least three letters that is not
in a boring face, then the pages will be skipped."
  :type '(repeat face)
  :group 'gnus-article-hiding)

;;; Internal Variables:

(defvar gnus-cite-article nil)
(defvar gnus-cite-overlay-list nil)

(defvar gnus-cite-prefix-alist nil)
;; Alist of citation prefixes.
;; The cdr is a list of lines with that prefix.

(defvar gnus-cite-attribution-alist nil)
;; Alist of attribution lines.
;; The car is a line number.
;; The cdr is the prefix for the citation started by that line.

(defvar gnus-cite-loose-prefix-alist nil)
;; Alist of citation prefixes that have no matching attribution.
;; The cdr is a list of lines with that prefix.

(defvar gnus-cite-loose-attribution-alist nil)
;; Alist of attribution lines that have no matching citation.
;; Each member has the form (WROTE IN PREFIX TAG), where
;; WROTE: is the attribution line number
;; IN: is the line number of the previous line if part of the same attribution,
;; PREFIX: Is the citation prefix of the attribution line(s), and
;; TAG: Is a Supercite tag, if any.

(defvar gnus-cited-opened-text-button-line-format-alist
  `((?b (marker-position beg) ?d)
    (?e (marker-position end) ?d)
    (?n (count-lines beg end) ?d)
    (?l (- end beg) ?d)))
(defvar gnus-cited-opened-text-button-line-format-spec nil)
(defvar gnus-cited-closed-text-button-line-format-alist
  gnus-cited-opened-text-button-line-format-alist)
(defvar gnus-cited-closed-text-button-line-format-spec nil)


;;; Commands:

(defun gnus-article-highlight-citation (&optional force)
  "Highlight cited text.
Each citation in the article will be highlighted with a different face.
The faces are taken from `gnus-cite-face-list'.
Attribution lines are highlighted with the same face as the
corresponding citation merged with the face `gnus-cite-attribution'.

Text is considered cited if at least `gnus-cite-minimum-match-count'
lines matches `message-cite-prefix-regexp' with the same prefix.

Lines matching `gnus-cite-attribution-suffix' and perhaps
`gnus-cite-attribution-prefix' are considered attribution lines."
  (interactive (list 'force))
  (save-excursion
    (set-buffer gnus-article-buffer)
    (gnus-cite-parse-maybe force)
    (let ((buffer-read-only nil)
	  (alist gnus-cite-prefix-alist)
	  (faces gnus-cite-face-list)
	  (inhibit-point-motion-hooks t)
	  face entry prefix skip numbers number face-alist)
      ;; Loop through citation prefixes.
      (while alist
	(setq entry (car alist)
	      alist (cdr alist)
	      prefix (car entry)
	      numbers (cdr entry)
	      face (car faces)
	      faces (or (cdr faces) gnus-cite-face-list)
	      face-alist (cons (cons prefix face) face-alist))
	(while numbers
	  (setq number (car numbers)
		numbers (cdr numbers))
	  (and (not (assq number gnus-cite-attribution-alist))
	       (not (assq number gnus-cite-loose-attribution-alist))
	       (gnus-cite-add-face number prefix face))))
      ;; Loop through attribution lines.
      (setq alist gnus-cite-attribution-alist)
      (while alist
	(setq entry (car alist)
	      alist (cdr alist)
	      number (car entry)
	      prefix (cdr entry)
	      skip (gnus-cite-find-prefix number)
	      face (cdr (assoc prefix face-alist)))
	;; Add attribution button.
	(goto-char (point-min))
	(forward-line (1- number))
	(when (re-search-forward gnus-cite-attribution-suffix
				 (gnus-point-at-eol)
				 t)
	  (gnus-article-add-button (match-beginning 1) (match-end 1)
				   'gnus-cite-toggle prefix))
	;; Highlight attribution line.
	(gnus-cite-add-face number skip face)
	(gnus-cite-add-face number skip gnus-cite-attribution-face))
      ;; Loop through attribution lines.
      (setq alist gnus-cite-loose-attribution-alist)
      (while alist
	(setq entry (car alist)
	      alist (cdr alist)
	      number (car entry)
	      skip (gnus-cite-find-prefix number))
	(gnus-cite-add-face number skip gnus-cite-attribution-face)))))

(defun gnus-dissect-cited-text ()
  "Dissect the article buffer looking for cited text."
  (save-excursion
    (set-buffer gnus-article-buffer)
    (gnus-cite-parse-maybe nil t)
    (let ((alist gnus-cite-prefix-alist)
	  prefix numbers number marks m)
      ;; Loop through citation prefixes.
      (while alist
	(setq numbers (pop alist)
	      prefix (pop numbers))
	(while numbers
	  (setq number (pop numbers))
	  (goto-char (point-min))
	  (forward-line number)
	  (push (cons (point-marker) "") marks)
	  (while (and numbers
		      (= (1- number) (car numbers)))
	    (setq number (pop numbers)))
	  (goto-char (point-min))
	  (forward-line (1- number))
	  (push (cons (point-marker) prefix) marks)))
      ;; Skip to the beginning of the body.
      (article-goto-body)
      (push (cons (point-marker) "") marks)
      ;; Find the end of the body.
      (goto-char (point-max))
      (gnus-article-search-signature)
      (push (cons (point-marker) "") marks)
      ;; Sort the marks.
      (setq marks (sort marks 'car-less-than-car))
      (let ((omarks marks))
	(setq marks nil)
	(while (cdr omarks)
	  (if (= (caar omarks) (caadr omarks))
	      (progn
		(unless (equal (cdar omarks) "")
		  (push (car omarks) marks))
		(unless (equal (cdadr omarks) "")
		  (push (cadr omarks) marks))
		(unless (and (equal (cdar omarks) "")
			     (equal (cdadr omarks) "")
			     (not (cddr omarks)))
		  (setq omarks (cdr omarks))))
	    (push (car omarks) marks))
	  (setq omarks (cdr omarks)))
	(when (car omarks)
	  (push (car omarks) marks))
	(setq marks (setq m (nreverse marks)))
	(while (cddr m)
	  (if (and (equal (cdadr m) "")
		   (equal (cdar m) (cdaddr m))
		   (goto-char (caadr m))
		   (forward-line 1)
		   (= (point) (caaddr m)))
	      (setcdr m (cdddr m))
	    (setq m (cdr m))))
	marks))))

(defun gnus-article-fill-cited-article (&optional force width)
  "Do word wrapping in the current article.
If WIDTH (the numerical prefix), use that text width when filling."
  (interactive (list t current-prefix-arg))
  (save-excursion
    (set-buffer gnus-article-buffer)
    (let ((buffer-read-only nil)
	  (inhibit-point-motion-hooks t)
	  (marks (gnus-dissect-cited-text))
	  (adaptive-fill-mode nil)
	  (filladapt-mode nil)
	  (fill-column (if width (prefix-numeric-value width) fill-column)))
      (save-restriction
	(while (cdr marks)
	  (narrow-to-region (caar marks) (caadr marks))
	  (let ((adaptive-fill-regexp
		 (concat "^" (regexp-quote (cdar marks)) " *"))
		(fill-prefix
		 (if (string= (cdar marks) "") ""
		   (concat (cdar marks) " ")))
		use-hard-newlines)
	    (fill-region (point-min) (point-max)))
	  (set-marker (caar marks) nil)
	  (setq marks (cdr marks)))
	(when marks
	  (set-marker (caar marks) nil))
	;; All this information is now incorrect.
	(setq gnus-cite-prefix-alist nil
	      gnus-cite-attribution-alist nil
	      gnus-cite-loose-prefix-alist nil
	      gnus-cite-loose-attribution-alist nil
	      gnus-cite-article nil)))))

(defun gnus-article-hide-citation (&optional arg force)
  "Toggle hiding of all cited text except attribution lines.
See the documentation for `gnus-article-highlight-citation'.
If given a negative prefix, always show; if given a positive prefix,
always hide."
  (interactive (append (gnus-article-hidden-arg) (list 'force)))
  (gnus-set-format 'cited-opened-text-button t)
  (gnus-set-format 'cited-closed-text-button t)
  (save-excursion
    (set-buffer gnus-article-buffer)
      (let ((buffer-read-only nil)
	    marks
	    (inhibit-point-motion-hooks t)
	    (props (nconc (list 'article-type 'cite)
			  gnus-hidden-properties))
	    (point (point-min))
	    found beg end start)
	(while (setq point
		     (text-property-any point (point-max)
					'gnus-callback
					'gnus-article-toggle-cited-text))
	  (setq found t)
	  (goto-char point)
	  (gnus-article-toggle-cited-text
	   (get-text-property point 'gnus-data) arg)
	  (forward-line 1)
	  (setq point (point)))
	(unless found
	  (setq marks (gnus-dissect-cited-text))
	  (while marks
	    (setq beg nil
		  end nil)
	    (while (and marks (string= (cdar marks) ""))
	      (setq marks (cdr marks)))
	    (when marks
	      (setq beg (caar marks)))
	    (while (and marks (not (string= (cdar marks) "")))
	      (setq marks (cdr marks)))
	    (when marks
	    (setq end (caar marks)))
	    ;; Skip past lines we want to leave visible.
	    (when (and beg end gnus-cited-lines-visible)
	      (goto-char beg)
	      (forward-line (if (consp gnus-cited-lines-visible)
				(car gnus-cited-lines-visible)
			      gnus-cited-lines-visible))
	      (if (>= (point) end)
		  (setq beg nil)
		(setq beg (point-marker))
		(when (consp gnus-cited-lines-visible)
		  (goto-char end)
		  (forward-line (- (cdr gnus-cited-lines-visible)))
		  (if (<= (point) beg)
		      (setq beg nil)
		  (setq end (point-marker))))))
	    (when (and beg end)
	      (gnus-add-wash-type 'cite)
	      ;; We use markers for the end-points to facilitate later
	      ;; wrapping and mangling of text.
	      (setq beg (set-marker (make-marker) beg)
		    end (set-marker (make-marker) end))
	      (gnus-add-text-properties-when 'article-type nil beg end props)
	      (goto-char beg)
	      (when (and gnus-cite-blank-line-after-header
			 (not (save-excursion (search-backward "\n\n" nil t))))
		(insert "\n"))
	      (put-text-property
	       (setq start (point-marker))
	       (progn
	       (gnus-article-add-button
		(point)
		(progn (eval gnus-cited-closed-text-button-line-format-spec)
		       (point))
		`gnus-article-toggle-cited-text
		(list (cons beg end) start))
	       (point))
	       'article-type 'annotation)
	      (set-marker beg (point))))))))

(defun gnus-article-toggle-cited-text (args &optional arg)
  "Toggle hiding the text in REGION.
ARG can be nil or a number.  Positive means hide, negative
means show, nil means toggle."
  (let* ((region (car args))
	 (beg (car region))
	 (end (cdr region))
	 (start (cadr args))
	 (hidden
	  (text-property-any beg (1- end) 'article-type 'cite))
	 (inhibit-point-motion-hooks t)
	 buffer-read-only)
    (when (or (null arg)
	      (zerop arg)
	      (and (> arg 0) (not hidden))
	      (and (< arg 0) hidden))
      (if hidden
	  (progn
	    ;; Can't remove 'cite from g-a-wash-types here because
	    ;; multiple citations may be hidden -jas
	    (gnus-remove-text-properties-when
	     'article-type 'cite beg end
	     (cons 'article-type (cons 'cite
				       gnus-hidden-properties))))
	(gnus-add-wash-type 'cite)
	(gnus-add-text-properties-when
	 'article-type nil beg end
	 (cons 'article-type (cons 'cite
				   gnus-hidden-properties))))
      (let ((gnus-article-mime-handle-alist-1 gnus-article-mime-handle-alist))
	(gnus-set-mode-line 'article))
      (save-excursion
	(goto-char start)
	(gnus-delete-line)
	(put-text-property
	 (point)
	 (progn
	   (gnus-article-add-button
	    (point)
	    (progn (eval
		    (if hidden
			gnus-cited-opened-text-button-line-format-spec
		      gnus-cited-closed-text-button-line-format-spec))
		   (point))
	    `gnus-article-toggle-cited-text
	    args)
	   (point))
	 'article-type 'annotation)))))

(defun gnus-article-hide-citation-maybe (&optional arg force)
  "Toggle hiding of cited text that has an attribution line.
If given a negative prefix, always show; if given a positive prefix,
always hide.
This will do nothing unless at least `gnus-cite-hide-percentage'
percent and at least `gnus-cite-hide-absolute' lines of the body is
cited text with attributions.  When called interactively, these two
variables are ignored.
See also the documentation for `gnus-article-highlight-citation'."
  (interactive (append (gnus-article-hidden-arg) '(force)))
  (with-current-buffer gnus-article-buffer
    (gnus-delete-wash-type 'cite)
    (unless (gnus-article-check-hidden-text 'cite arg)
      (save-excursion
	(gnus-cite-parse-maybe force)
	(article-goto-body)
	(let ((start (point))
	      (atts gnus-cite-attribution-alist)
	      (buffer-read-only nil)
	      (inhibit-point-motion-hooks t)
	      (hidden 0)
	      total)
	  (goto-char (point-max))
	  (gnus-article-search-signature)
	  (setq total (count-lines start (point)))
	  (while atts
	    (setq hidden (+ hidden (length (cdr (assoc (cdar atts)
						       gnus-cite-prefix-alist))))
		  atts (cdr atts)))
	  (when (or force
		    (and (> (* 100 hidden) (* gnus-cite-hide-percentage total))
			 (> hidden gnus-cite-hide-absolute)))
	    (gnus-add-wash-type 'cite)
	    (setq atts gnus-cite-attribution-alist)
	    (while atts
	      (setq total (cdr (assoc (cdar atts) gnus-cite-prefix-alist))
		    atts (cdr atts))
	      (while total
		(setq hidden (car total)
		      total (cdr total))
		(goto-char (point-min))
		(forward-line (1- hidden))
		(unless (assq hidden gnus-cite-attribution-alist)
		  (gnus-add-text-properties
		   (point) (progn (forward-line 1) (point))
		   (nconc (list 'article-type 'cite)
			  gnus-hidden-properties)))))))))
    (gnus-set-mode-line 'article)))

(defun gnus-article-hide-citation-in-followups ()
  "Hide cited text in non-root articles."
  (interactive)
  (save-excursion
    (set-buffer gnus-article-buffer)
    (let ((article (cdr gnus-article-current)))
      (unless (save-excursion
		(set-buffer gnus-summary-buffer)
		(gnus-article-displayed-root-p article))
	(gnus-article-hide-citation)))))

;;; Internal functions:

(defun gnus-cite-parse-maybe (&optional force no-overlay)
  "Always parse the buffer."
  (gnus-cite-localize)
  ;;Reset parser information.
  (setq gnus-cite-prefix-alist nil
	gnus-cite-attribution-alist nil
	gnus-cite-loose-prefix-alist nil
	gnus-cite-loose-attribution-alist nil)
  (unless no-overlay
    (gnus-cite-delete-overlays))
  ;; Parse if not too large.
  (if (and gnus-cite-parse-max-size
	   (> (buffer-size) gnus-cite-parse-max-size))
      ()
    (setq gnus-cite-article (cons (car gnus-article-current)
				  (cdr gnus-article-current)))
    (gnus-cite-parse-wrapper)))

(defun gnus-cite-delete-overlays ()
  (dolist (overlay gnus-cite-overlay-list)
    (ignore-errors
      (when (or (not (gnus-overlay-end overlay))
		(and (>= (gnus-overlay-end overlay) (point-min))
		     (<= (gnus-overlay-end overlay) (point-max))))
	(setq gnus-cite-overlay-list (delete overlay gnus-cite-overlay-list))
	(ignore-errors
	  (gnus-delete-overlay overlay))))))

(defun gnus-cite-parse-wrapper ()
  ;; Wrap chopped gnus-cite-parse.
  (article-goto-body)
  (let ((inhibit-point-motion-hooks t))
    (save-excursion
      (gnus-cite-parse-attributions))
    (save-excursion
      (gnus-cite-parse))
    (save-excursion
      (gnus-cite-connect-attributions))))

(defun gnus-cite-parse ()
  ;; Parse and connect citation prefixes and attribution lines.

  ;; Parse current buffer searching for citation prefixes.
  (let ((line (1+ (count-lines (point-min) (point))))
	(case-fold-search t)
	(max (save-excursion
	       (goto-char (point-max))
	       (gnus-article-search-signature)
	       (point)))
	(prefix-regexp (concat "^\\(" message-cite-prefix-regexp "\\)"))
	alist entry start begin end numbers prefix guess-limit)
    ;; Get all potential prefixes in `alist'.
    (while (< (point) max)
      ;; Each line.
      (setq begin (point)
	    guess-limit (progn (skip-chars-forward "^> \t\r\n") (point))
	    end (gnus-point-at-bol 2)
	    start end)
      (goto-char begin)
      ;; Ignore standard Supercite attribution prefix.
      (when (and (< guess-limit (+ begin gnus-cite-max-prefix))
		 (looking-at gnus-supercite-regexp))
	(if (match-end 1)
	    (setq end (1+ (match-end 1)))
	  (setq end (1+ begin))))
      ;; Ignore very long prefixes.
      (when (> end (+ begin gnus-cite-max-prefix))
	(setq end (+ begin gnus-cite-max-prefix)))
      ;; Ignore quoted envelope From_.
      (when (and gnus-cite-ignore-quoted-from
		 (prog2
		     (setq case-fold-search nil)
		     (looking-at ">From ")
		   (setq case-fold-search t)))
	(setq end (1+ begin)))
      (while (re-search-forward prefix-regexp (1- end) t)
	;; Each prefix.
	(setq end (match-end 0)
	      prefix (buffer-substring begin end))
	(gnus-set-text-properties 0 (length prefix) nil prefix)
	(setq entry (assoc prefix alist))
	(if entry
	    (setcdr entry (cons line (cdr entry)))
	  (push (list prefix line) alist))
	(goto-char begin))
      (goto-char start)
      (setq line (1+ line)))
    ;; Horrible special case for some Microsoft mailers.
    (goto-char (point-min))
    (when (re-search-forward gnus-cite-unsightly-citation-regexp max t)
      (setq begin (count-lines (point-min) (point)))
      (setq end (count-lines (point-min) max))
      (setq entry nil)
      (while (< begin end)
	(push begin entry)
	(setq begin (1+ begin)))
      (push (cons "" entry) alist))
    ;; We got all the potential prefixes.  Now create
    ;; `gnus-cite-prefix-alist' containing the oldest prefix for each
    ;; line that appears at least `gnus-cite-minimum-match-count'
    ;; times.  First sort them by length.  Longer is older.
    (setq alist (sort alist (lambda (a b)
			      (> (length (car a)) (length (car b))))))
    (while alist
      (setq entry (car alist)
	    prefix (car entry)
	    numbers (cdr entry)
	    alist (cdr alist))
      (cond ((null numbers)
	     ;; No lines with this prefix that wasn't also part of
	     ;; a longer prefix.
	     )
	    ((< (length numbers) gnus-cite-minimum-match-count)
	     ;; Too few lines with this prefix.  We keep it a bit
	     ;; longer in case it is an exact match for an attribution
	     ;; line, but we don't remove the line from other
	     ;; prefixes.
	     (push entry gnus-cite-prefix-alist))
	    (t
	     (push entry
		   gnus-cite-prefix-alist)
	     ;; Remove articles from other prefixes.
	     (let ((loop alist)
		   current)
	       (while loop
		 (setq current (car loop)
		       loop (cdr loop))
		 (setcdr current
			 (gnus-set-difference (cdr current) numbers)))))))))

(defun gnus-cite-parse-attributions ()
  (let (al-alist)
    ;; Parse attributions
    (while (re-search-forward gnus-cite-attribution-suffix (point-max) t)
      (let* ((start (match-beginning 0))
	     (end (match-end 0))
	     (wrote (count-lines (point-min) end))
	     (prefix (gnus-cite-find-prefix wrote))
	     ;; Check previous line for an attribution leader.
	     (tag (progn
		    (beginning-of-line 1)
		    (when (looking-at gnus-supercite-secondary-regexp)
		      (buffer-substring (match-beginning 1)
					(match-end 1)))))
	     (in (progn
		   (goto-char start)
		   (and (re-search-backward gnus-cite-attribution-prefix
					    (save-excursion
					      (beginning-of-line 0)
					      (point))
					    t)
			(not (re-search-forward gnus-cite-attribution-suffix
						start t))
			(count-lines (point-min) (1+ (point)))))))
	(when (eq wrote in)
	  (setq in nil))
	(goto-char end)
	;; don't add duplicates
	(let ((al (buffer-substring (save-excursion (beginning-of-line 0)
						    (1+ (point)))
				    end)))
	  (if (not (assoc al al-alist))
	      (progn
		(push (list wrote in prefix tag)
		      gnus-cite-loose-attribution-alist)
		(push (cons al t) al-alist))))))))

(defun gnus-cite-connect-attributions ()
  ;; Connect attributions to citations

  ;; No citations have been connected to attribution lines yet.
  (setq gnus-cite-loose-prefix-alist (append gnus-cite-prefix-alist nil))

  ;; Parse current buffer searching for attribution lines.
  ;; Find exact supercite citations.
  (gnus-cite-match-attributions 'small nil
				(lambda (prefix tag)
				  (when tag
				    (concat "\\`"
					    (regexp-quote prefix) "[ \t]*"
					    (regexp-quote tag) ">"))))
  ;; Find loose supercite citations after attributions.
  (gnus-cite-match-attributions 'small t
				(lambda (prefix tag)
				  (when tag
				    (concat "\\<"
					    (regexp-quote tag)
					    "\\>"))))
  ;; Find loose supercite citations anywhere.
  (gnus-cite-match-attributions 'small nil
				(lambda (prefix tag)
				  (when tag
				    (concat "\\<"
					    (regexp-quote tag)
					    "\\>"))))
  ;; Find nested citations after attributions.
  (gnus-cite-match-attributions 'small-if-unique t
				(lambda (prefix tag)
				  (concat "\\`" (regexp-quote prefix) ".+")))
  ;; Find nested citations anywhere.
  (gnus-cite-match-attributions 'small nil
				(lambda (prefix tag)
				  (concat "\\`" (regexp-quote prefix) ".+")))
  ;; Remove loose prefixes with too few lines.
  (let ((alist gnus-cite-loose-prefix-alist)
	entry)
    (while alist
      (setq entry (car alist)
	    alist (cdr alist))
      (when (< (length (cdr entry)) gnus-cite-minimum-match-count)
	(setq gnus-cite-prefix-alist
	      (delq entry gnus-cite-prefix-alist)
	      gnus-cite-loose-prefix-alist
	      (delq entry gnus-cite-loose-prefix-alist)))))
  ;; Find flat attributions.
  (gnus-cite-match-attributions 'first t nil)
  ;; Find any attributions (are we getting desperate yet?).
  (gnus-cite-match-attributions 'first nil nil))

(defun gnus-cite-match-attributions (sort after fun)
  ;; Match all loose attributions and citations (SORT AFTER FUN) .
  ;;
  ;; If SORT is `small', the citation with the shortest prefix will be
  ;; used, if it is `first' the first prefix will be used, if it is
  ;; `small-if-unique' the shortest prefix will be used if the
  ;; attribution line does not share its own prefix with other
  ;; loose attribution lines, otherwise the first prefix will be used.
  ;;
  ;; If AFTER is non-nil, only citations after the attribution line
  ;; will be considered.
  ;;
  ;; If FUN is non-nil, it will be called with the arguments (WROTE
  ;; PREFIX TAG) and expected to return a regular expression.  Only
  ;; citations whose prefix matches the regular expression will be
  ;; considered.
  ;;
  ;; WROTE is the attribution line number.
  ;; PREFIX is the attribution line prefix.
  ;; TAG is the Supercite tag on the attribution line.
  (let ((atts gnus-cite-loose-attribution-alist)
	(case-fold-search t)
	att wrote in prefix tag regexp limit smallest best size)
    (while atts
      (setq att (car atts)
	    atts (cdr atts)
	    wrote (nth 0 att)
	    in (nth 1 att)
	    prefix (nth 2 att)
	    tag (nth 3 att)
	    regexp (if fun (funcall fun prefix tag) "")
	    size (cond ((eq sort 'small) t)
		       ((eq sort 'first) nil)
		       (t (< (length (gnus-cite-find-loose prefix)) 2)))
	    limit (if after wrote -1)
	    smallest 1000000
	    best nil)
      (let ((cites gnus-cite-loose-prefix-alist)
	    cite candidate numbers first compare)
	(while cites
	  (setq cite (car cites)
		cites (cdr cites)
		candidate (car cite)
		numbers (cdr cite)
		first (apply 'min numbers)
		compare (if size (length candidate) first))
	  (and (> first limit)
	       regexp
	       (string-match regexp candidate)
	       (< compare smallest)
	       (setq best cite
		     smallest compare))))
      (if (null best)
	  ()
	(setq gnus-cite-loose-attribution-alist
	      (delq att gnus-cite-loose-attribution-alist))
	(push (cons wrote (car best)) gnus-cite-attribution-alist)
	(when in
	  (push (cons in (car best)) gnus-cite-attribution-alist))
	(when (memq best gnus-cite-loose-prefix-alist)
	  (let ((loop gnus-cite-prefix-alist)
		(numbers (cdr best))
		current)
	    (setq gnus-cite-loose-prefix-alist
		  (delq best gnus-cite-loose-prefix-alist))
	    (while loop
	      (setq current (car loop)
		    loop (cdr loop))
	      (if (eq current best)
		  ()
		(setcdr current (gnus-set-difference (cdr current) numbers))
		(when (null (cdr current))
		  (setq gnus-cite-loose-prefix-alist
			(delq current gnus-cite-loose-prefix-alist)
			atts (delq current atts)))))))))))

(defun gnus-cite-find-loose (prefix)
  ;; Return a list of loose attribution lines prefixed by PREFIX.
  (let* ((atts gnus-cite-loose-attribution-alist)
	 att line lines)
    (while atts
      (setq att (car atts)
	    line (car att)
	    atts (cdr atts))
      (when (string-equal (gnus-cite-find-prefix line) prefix)
	(push line lines)))
    lines))

(defun gnus-cite-add-face (number prefix face)
  ;; At line NUMBER, ignore PREFIX and add FACE to the rest of the line.
  (when face
    (let ((inhibit-point-motion-hooks t)
	  from to overlay)
      (goto-char (point-min))
      (when (zerop (forward-line (1- number)))
	(forward-char (length prefix))
	(skip-chars-forward " \t")
	(setq from (point))
	(end-of-line 1)
	(skip-chars-backward " \t")
	(setq to (point))
	(when (< from to)
	  (push (setq overlay (gnus-make-overlay from to))
		gnus-cite-overlay-list)
	  (gnus-overlay-put overlay 'evaporate t)
	  (gnus-overlay-put overlay 'face face))))))

(defun gnus-cite-toggle (prefix)
  (save-excursion
    (set-buffer gnus-article-buffer)
    (gnus-cite-parse-maybe nil t)
    (let ((buffer-read-only nil)
	  (numbers (cdr (assoc prefix gnus-cite-prefix-alist)))
	  (inhibit-point-motion-hooks t)
	  number)
      (while numbers
	(setq number (car numbers)
	      numbers (cdr numbers))
	(goto-char (point-min))
	(forward-line (1- number))
	(cond ((get-text-property (point) 'invisible)
	       ;; Can't remove 'cite from g-a-wash-types here because
	       ;; multiple citations may be hidden -jas
	       (remove-text-properties (point) (progn (forward-line 1) (point))
				       gnus-hidden-properties))
	      ((assq number gnus-cite-attribution-alist))
	      (t
	       (gnus-add-wash-type 'cite)
	       (gnus-add-text-properties
		(point) (progn (forward-line 1) (point))
		(nconc (list 'article-type 'cite)
		       gnus-hidden-properties))))
	(let ((gnus-article-mime-handle-alist-1
	       gnus-article-mime-handle-alist))
	  (gnus-set-mode-line 'article))))))

(defun gnus-cite-find-prefix (line)
  ;; Return citation prefix for LINE.
  (let ((alist gnus-cite-prefix-alist)
	(prefix "")
	entry)
    (while alist
      (setq entry (car alist)
	    alist (cdr alist))
      (when (memq line (cdr entry))
	(setq prefix (car entry))))
    prefix))

(defun gnus-cite-localize ()
  "Make the citation variables local to the article buffer."
  (let ((vars '(gnus-cite-article
		gnus-cite-overlay-list gnus-cite-prefix-alist
		gnus-cite-attribution-alist gnus-cite-loose-prefix-alist
		gnus-cite-loose-attribution-alist)))
    (while vars
      (make-local-variable (pop vars)))))

(defun gnus-cited-line-p ()
  "Say whether the current line is a cited line."
  (save-excursion
    (beginning-of-line)
    (let ((found nil))
      (dolist (prefix (mapcar 'car gnus-cite-prefix-alist))
	(when (string= (buffer-substring (point) (+ (length prefix) (point)))
		       prefix)
	  (setq found t)))
      found)))

(gnus-ems-redefine)

(provide 'gnus-cite)

;; Local Variables:
;; coding: iso-8859-1
;; End:

;;; arch-tag: 1997b044-6067-471e-8c8f-dc903093098a
;;; gnus-cite.el ends here