summaryrefslogtreecommitdiff
path: root/lisp/doc-view.el
blob: f8975a57b7b7371faf93c5dc4656b2a0a78ea2b3 (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
;;; doc-view.el --- View PDF/PostScript/DVI files in Emacs -*- lexical-binding: t -*-


;; Copyright (C) 2007-2012 Free Software Foundation, Inc.
;;
;; Author: Tassilo Horn <tsdh@gnu.org>
;; Maintainer: Tassilo Horn <tsdh@gnu.org>
;; Keywords: files, pdf, ps, dvi

;; 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 <http://www.gnu.org/licenses/>.

;;; Requirements:

;; doc-view.el requires GNU Emacs 22.1 or newer.  You also need Ghostscript,
;; `dvipdf' (comes with Ghostscript) or `dvipdfm' (comes with teTeX or TeXLive)
;; and `pdftotext', which comes with xpdf (http://www.foolabs.com/xpdf/) or
;; poppler (http://poppler.freedesktop.org/).

;;; Commentary:

;; DocView is a document viewer for Emacs.  It converts PDF, PS and DVI files
;; to a set of PNG files, one PNG for each page, and displays the PNG images
;; inside an Emacs buffer.  This buffer uses `doc-view-mode' which provides
;; convenient key bindings for browsing the document.
;;
;; To use it simply open a document file with
;;
;;     C-x C-f ~/path/to/document RET
;;
;; and the document will be converted and displayed, if your emacs supports png
;; images.  With `C-c C-c' you can toggle between the rendered images
;; representation and the source text representation of the document.
;;
;; Since conversion may take some time all the PNG images are cached in a
;; subdirectory of `doc-view-cache-directory' and reused when you want to view
;; that file again.  To reconvert a document hit `g' (`doc-view-reconvert-doc')
;; when displaying the document.  To delete all cached files use
;; `doc-view-clear-cache'.  To open the cache with dired, so that you can tidy
;; it out use `doc-view-dired-cache'.
;;
;; When conversion in underway the first page will be displayed as soon as it
;; is available and the available pages are refreshed every
;; `doc-view-conversion-refresh-interval' seconds.  If that variable is nil the
;; pages won't be displayed before conversion of the document finished
;; completely.
;;
;; DocView lets you select a slice of the displayed pages.  This slice
;; will be remembered and applied to all pages of the current
;; document.  This enables you to cut away the margins of a document
;; to save some space.  To select a slice you can use
;; `doc-view-set-slice' (bound to `s s') which will query you for the
;; coordinates of the slice's top-left corner and its width and
;; height.  A much more convenient way to do the same is offered by
;; the command `doc-view-set-slice-using-mouse' (bound to `s m').
;; After invocation you only have to press mouse-1 at the top-left
;; corner and drag it to the bottom-right corner of the desired slice.
;; Even more accurate and convenient is to use
;; `doc-view-set-slice-from-bounding-box' (bound to `s b') which uses
;; the BoundingBox information of the current page to set an optimal
;; slice.  To reset the slice use `doc-view-reset-slice' (bound to `s
;; r').
;;
;; You can also search within the document.  The command `doc-view-search'
;; (bound to `C-s') queries for a search regexp and initializes a list of all
;; matching pages and messages how many match-pages were found.  After that you
;; can jump to the next page containing a match with an additional `C-s'.  With
;; `C-r' you can do the same, but backwards.  To search for a new regexp give a
;; prefix arg to one of the search functions, e.g. by typing `C-u C-s'.  The
;; searching works by using a plain text representation of the document.  If
;; that doesn't already exist the first invocation of `doc-view-search' (or
;; `doc-view-search-backward') starts the conversion.  When that finishes and
;; you're still viewing the document (i.e. you didn't switch to another buffer)
;; you're queried for the regexp then.
;;
;; Dired users can simply hit `v' on a document file.  If it's a PS, PDF or DVI
;; it will be opened using `doc-view-mode'.
;;

;;; Configuration:

;; If the images are too small or too big you should set the "-rXXX" option in
;; `doc-view-ghostscript-options' to another value.  (The bigger your screen,
;; the higher the value.)
;;
;; This and all other options can be set with the customization interface.
;; Simply do
;;
;;     M-x customize-group RET doc-view RET
;;
;; and modify them to your needs.

;;; Todo:

;; - add print command.
;; - share more code with image-mode.
;; - better menu.
;; - Bind slicing to a drag event.
;; - zoom the region around the cursor (like xdvi).
;; - get rid of the silly arrow in the fringe.
;; - improve anti-aliasing (pdf-utils gets it better).

;;;; About isearch support

;; I tried implementing isearch by setting
;; `isearch-search-fun-function' buffer-locally, but that didn't
;; work too good.  The function doing the real search was called
;; endlessly somehow.  But even if we'd get that working no real
;; isearch feeling comes up due to the missing match highlighting.
;; Currently I display all lines containing a match in a tooltip and
;; each C-s or C-r jumps directly to the next/previous page with a
;; match.  With isearch we could only display the current match.  So
;; we had to decide if another C-s jumps to the next page with a
;; match (thus only the first match in a page will be displayed in a
;; tooltip) or to the next match, which would do nothing visible
;; (except the tooltip) if the next match is on the same page.

;; And it's much slower than the current search facility, because
;; isearch really searches for each step forward or backward whereas
;; the current approach searches once and then it knows to which
;; pages to jump.

;; Anyway, if someone with better isearch knowledge wants to give it a try,
;; feel free to do it.  --Tassilo

;;; Code:

(eval-when-compile (require 'cl-lib))
(require 'dired)
(require 'image-mode)
(require 'jka-compr)

;;;; Customization Options

(defgroup doc-view nil
  "In-buffer viewer for PDF, PostScript and DVI files."
  :link '(function-link doc-view)
  :version "22.2"
  :group 'applications
  :group 'data
  :group 'multimedia
  :prefix "doc-view-")

(defcustom doc-view-ghostscript-program "gs"
  "Program to convert PS and PDF files to PNG."
  :type 'file
  :group 'doc-view)

(defcustom doc-view-ghostscript-options
  '("-dSAFER" ;; Avoid security problems when rendering files from untrusted
    ;; sources.
    "-dNOPAUSE" "-sDEVICE=png16m" "-dTextAlphaBits=4"
    "-dBATCH" "-dGraphicsAlphaBits=4" "-dQUIET")
  "A list of options to give to ghostscript."
  :type '(repeat string)
  :group 'doc-view)

(defcustom doc-view-resolution 100
  "Dots per inch resolution used to render the documents.
Higher values result in larger images."
  :type 'number
  :group 'doc-view)

(defcustom doc-view-image-width 850
  "Default image width.
Has only an effect if imagemagick support is compiled into emacs."
  :version "24.1"
  :type 'number
  :group 'doc-view)

(defcustom doc-view-dvipdfm-program "dvipdfm"
  "Program to convert DVI files to PDF.

DVI file will be converted to PDF before the resulting PDF is
converted to PNG.

If this and `doc-view-dvipdf-program' are set,
`doc-view-dvipdf-program' will be preferred."
  :type 'file
  :group 'doc-view)

(defcustom doc-view-dvipdf-program "dvipdf"
  "Program to convert DVI files to PDF.

DVI file will be converted to PDF before the resulting PDF is
converted to PNG.

If this and `doc-view-dvipdfm-program' are set,
`doc-view-dvipdf-program' will be preferred."
  :type 'file
  :group 'doc-view)

(defcustom doc-view-unoconv-program "unoconv"
  "Program to convert any file type readable by OpenOffice.org to PDF.

Needed for viewing OpenOffice.org (and MS Office) files."
  :version "24.1"
  :type 'file
  :group 'doc-view)

(defcustom doc-view-ps2pdf-program "ps2pdf"
  "Program to convert PS files to PDF.

PS files will be converted to PDF before searching is possible."
  :type 'file
  :group 'doc-view)

(defcustom doc-view-pdftotext-program "pdftotext"
  "Program to convert PDF files to plain text.

Needed for searching."
  :type 'file
  :group 'doc-view)

(defcustom doc-view-cache-directory
  (expand-file-name (format "docview%d" (user-uid))
		    temporary-file-directory)
  "The base directory, where the PNG images will be saved."
  :type 'directory
  :group 'doc-view)

(defvar doc-view-conversion-buffer " *doc-view conversion output*"
  "The buffer where messages from the converter programs go to.")

(defcustom doc-view-conversion-refresh-interval 1
  "Interval in seconds between refreshes of the DocView buffer while converting.
After such a refresh newly converted pages will be available for
viewing.  If set to nil there won't be any refreshes and the
pages won't be displayed before conversion of the whole document
has finished."
  :type 'integer
  :group 'doc-view)

(defcustom doc-view-continuous nil
  "In Continuous mode reaching the page edge advances to next/previous page.
When non-nil, scrolling a line upward at the bottom edge of the page
moves to the next page, and scrolling a line downward at the top edge
of the page moves to the previous page."
  :type 'boolean
  :group 'doc-view
  :version "23.2")

;;;; Internal Variables

(defun doc-view-new-window-function (winprops)
  ;; (message "New window %s for buf %s" (car winprops) (current-buffer))
  (cl-assert (or (eq t (car winprops))
                 (eq (window-buffer (car winprops)) (current-buffer))))
  (let ((ol (image-mode-window-get 'overlay winprops)))
    (if ol
        (progn
          (setq ol (copy-overlay ol))
          ;; `ol' might actually be dead.
          (move-overlay ol (point-min) (point-max)))
      (setq ol (make-overlay (point-min) (point-max) nil t))
      (overlay-put ol 'doc-view t))
    (overlay-put ol 'window (car winprops))
    (unless (windowp (car winprops))
      ;; It's a pseudo entry.  Let's make sure it's not displayed (the
      ;; `window' property is only effective if its value is a window).
      (cl-assert (eq t (car winprops)))
      (delete-overlay ol))
    (image-mode-window-put 'overlay ol winprops)))

(defvar doc-view-current-files nil
  "Only used internally.")
(make-variable-buffer-local 'doc-view-current-files)

(defvar doc-view-current-converter-processes nil
  "Only used internally.")
(make-variable-buffer-local 'doc-view-current-converter-processes)

(defvar doc-view-current-timer nil
  "Only used internally.")
(make-variable-buffer-local 'doc-view-current-timer)

(defvar doc-view-current-cache-dir nil
  "Only used internally.")
(make-variable-buffer-local 'doc-view-current-cache-dir)

(defvar doc-view-current-search-matches nil
  "Only used internally.")
(make-variable-buffer-local 'doc-view-current-search-matches)

(defvar doc-view-pending-cache-flush nil
  "Only used internally.")

(defvar doc-view-previous-major-mode nil
  "Only used internally.")

(defvar doc-view-buffer-file-name nil
  "Only used internally.
The file name used for conversion.  Normally it's the same as
`buffer-file-name', but for remote files, compressed files and
files inside an archive it is a temporary copy of
the (uncompressed, extracted) file residing in
`doc-view-cache-directory'.")

(defvar doc-view-doc-type nil
  "The type of document in the current buffer.
Can be `dvi', `pdf', or `ps'.")

;;;; DocView Keymaps

(defvar doc-view-mode-map
  (let ((map (make-sparse-keymap)))
    (set-keymap-parent map image-mode-map)
    ;; Navigation in the document
    (define-key map (kbd "n")         'doc-view-next-page)
    (define-key map (kbd "p")         'doc-view-previous-page)
    (define-key map (kbd "<next>")    'forward-page)
    (define-key map (kbd "<prior>")   'backward-page)
    (define-key map [remap forward-page]  'doc-view-next-page)
    (define-key map [remap backward-page] 'doc-view-previous-page)
    (define-key map (kbd "SPC")       'doc-view-scroll-up-or-next-page)
    (define-key map (kbd "DEL")       'doc-view-scroll-down-or-previous-page)
    (define-key map (kbd "C-n")       'doc-view-next-line-or-next-page)
    (define-key map (kbd "<down>")    'doc-view-next-line-or-next-page)
    (define-key map (kbd "C-p")       'doc-view-previous-line-or-previous-page)
    (define-key map (kbd "<up>")      'doc-view-previous-line-or-previous-page)
    (define-key map (kbd "M-<")       'doc-view-first-page)
    (define-key map (kbd "M->")       'doc-view-last-page)
    (define-key map [remap goto-line] 'doc-view-goto-page)
    (define-key map (kbd "RET")       'image-next-line)
    ;; Zoom in/out.
    (define-key map "+"               'doc-view-enlarge)
    (define-key map "-"               'doc-view-shrink)
    ;; Fit the image to the window
    (define-key map "W"               'doc-view-fit-width-to-window)
    (define-key map "H"               'doc-view-fit-height-to-window)
    (define-key map "P"               'doc-view-fit-page-to-window)
    ;; Killing the buffer (and the process)
    (define-key map (kbd "k")         'doc-view-kill-proc-and-buffer)
    (define-key map (kbd "K")         'doc-view-kill-proc)
    ;; Slicing the image
    (define-key map (kbd "s s")       'doc-view-set-slice)
    (define-key map (kbd "s m")       'doc-view-set-slice-using-mouse)
    (define-key map (kbd "s b")       'doc-view-set-slice-from-bounding-box)
    (define-key map (kbd "s r")       'doc-view-reset-slice)
    ;; Searching
    (define-key map (kbd "C-s")       'doc-view-search)
    (define-key map (kbd "<find>")    'doc-view-search)
    (define-key map (kbd "C-r")       'doc-view-search-backward)
    ;; Show the tooltip
    (define-key map (kbd "C-t")       'doc-view-show-tooltip)
    ;; Toggle between text and image display or editing
    (define-key map (kbd "C-c C-c")   'doc-view-toggle-display)
    ;; Open a new buffer with doc's text contents
    (define-key map (kbd "C-c C-t")   'doc-view-open-text)
    ;; Reconvert the current document.  Don't just use revert-buffer
    ;; because that resets the scale factor, the page number, ...
    (define-key map (kbd "g")         'doc-view-revert-buffer)
    (define-key map (kbd "r")         'doc-view-revert-buffer)
    map)
  "Keymap used by `doc-view-mode' when displaying a doc as a set of images.")

(defun doc-view-revert-buffer (&optional ignore-auto noconfirm)
  "Like `revert-buffer', but preserves the buffer's current modes."
  ;; FIXME: this should probably be moved to files.el and used for
  ;; most/all "g" bindings to revert-buffer.
  (interactive (list (not current-prefix-arg)))
  (revert-buffer ignore-auto noconfirm 'preserve-modes))


(easy-menu-define doc-view-menu doc-view-mode-map
  "Menu for Doc View mode."
  '("DocView"
    ["Toggle display"		doc-view-toggle-display]
    ("Continuous"
     ["Off"                     (setq doc-view-continuous nil)
      :style radio :selected    (eq doc-view-continuous nil)]
     ["On"		        (setq doc-view-continuous t)
      :style radio :selected    (eq doc-view-continuous t)]
     "---"
     ["Save as Default"
      (customize-save-variable 'doc-view-continuous doc-view-continuous) t]
     )
    "---"
    ["Set Slice"		doc-view-set-slice-using-mouse]
    ["Set Slice (BoundingBox)"  doc-view-set-slice-from-bounding-box]
    ["Set Slice (manual)"	doc-view-set-slice]
    ["Reset Slice"		doc-view-reset-slice]
    "---"
    ["Search"			doc-view-search]
    ["Search Backwards"         doc-view-search-backward]
    ))

(defvar doc-view-minor-mode-map
  (let ((map (make-sparse-keymap)))
    ;; Toggle between text and image display or editing
    (define-key map (kbd "C-c C-c") 'doc-view-toggle-display)
    map)
  "Keymap used by `doc-minor-view-mode'.")

;;;; Navigation Commands

(defmacro doc-view-current-page (&optional win)
  `(image-mode-window-get 'page ,win))
(defmacro doc-view-current-info () `(image-mode-window-get 'info))
(defmacro doc-view-current-overlay () `(image-mode-window-get 'overlay))
(defmacro doc-view-current-image () `(image-mode-window-get 'image))
(defmacro doc-view-current-slice () `(image-mode-window-get 'slice))

(defun doc-view-last-page-number ()
  (length doc-view-current-files))

(defun doc-view-goto-page (page)
  "View the page given by PAGE."
  (interactive "nPage: ")
  (let ((len (doc-view-last-page-number))
	(hscroll (window-hscroll)))
    (if (< page 1)
	(setq page 1)
      (when (and (> page len)
                 ;; As long as the converter is running, we don't know
                 ;; how many pages will be available.
                 (null doc-view-current-converter-processes))
	(setq page len)))
    (setf (doc-view-current-page) page
	  (doc-view-current-info)
	  (concat
	   (propertize
	    (format "Page %d of %d." page len) 'face 'bold)
	   ;; Tell user if converting isn't finished yet
	   (if doc-view-current-converter-processes
	       " (still converting...)\n"
	     "\n")
	   ;; Display context infos if this page matches the last search
	   (when (and doc-view-current-search-matches
		      (assq page doc-view-current-search-matches))
	     (concat (propertize "Search matches:\n" 'face 'bold)
		     (let ((contexts ""))
		       (dolist (m (cdr (assq page
					     doc-view-current-search-matches)))
			 (setq contexts (concat contexts "  - \"" m "\"\n")))
		       contexts)))))
    ;; Update the buffer
    ;; We used to find the file name from doc-view-current-files but
    ;; that's not right if the pages are not generated sequentially
    ;; or if the page isn't in doc-view-current-files yet.
    (let ((file (expand-file-name (format "page-%d.png" page)
                                  (doc-view-current-cache-dir))))
      (doc-view-insert-image file :pointer 'arrow)
      (set-window-hscroll (selected-window) hscroll)
      (when (and (not (file-exists-p file))
                 doc-view-current-converter-processes)
        ;; The PNG file hasn't been generated yet.
        (doc-view-pdf->png-1 doc-view-buffer-file-name file page
                             (let ((win (selected-window)))
                               (lambda ()
                                 (and (eq (current-buffer) (window-buffer win))
                                      ;; If we changed page in the mean
                                      ;; time, don't mess things up.
                                      (eq (doc-view-current-page win) page)
                                      ;; Make sure we don't infloop.
                                      (file-readable-p file)
                                      (with-selected-window win
							    (doc-view-goto-page page))))))))
    (overlay-put (doc-view-current-overlay)
                 'help-echo (doc-view-current-info))))

(defun doc-view-next-page (&optional arg)
  "Browse ARG pages forward."
  (interactive "p")
  (doc-view-goto-page (+ (doc-view-current-page) (or arg 1))))

(defun doc-view-previous-page (&optional arg)
  "Browse ARG pages backward."
  (interactive "p")
  (doc-view-goto-page (- (doc-view-current-page) (or arg 1))))

(defun doc-view-first-page ()
  "View the first page."
  (interactive)
  (doc-view-goto-page 1))

(defun doc-view-last-page ()
  "View the last page."
  (interactive)
  (doc-view-goto-page (doc-view-last-page-number)))

(defun doc-view-scroll-up-or-next-page (&optional arg)
  "Scroll page up ARG lines if possible, else goto next page.
When `doc-view-continuous' is non-nil, scrolling upward
at the bottom edge of the page moves to the next page.
Otherwise, goto next page only on typing SPC (ARG is nil)."
  (interactive "P")
  (if (or doc-view-continuous (null arg))
      (let ((hscroll (window-hscroll))
	    (cur-page (doc-view-current-page)))
	(when (= (window-vscroll) (image-scroll-up arg))
	  (doc-view-next-page)
	  (when (/= cur-page (doc-view-current-page))
	    (image-bob)
	    (image-bol 1))
	  (set-window-hscroll (selected-window) hscroll)))
    (image-scroll-up arg)))

(defun doc-view-scroll-down-or-previous-page (&optional arg)
  "Scroll page down ARG lines if possible, else goto previous page.
When `doc-view-continuous' is non-nil, scrolling downward
at the top edge of the page moves to the previous page.
Otherwise, goto previous page only on typing DEL (ARG is nil)."
  (interactive "P")
  (if (or doc-view-continuous (null arg))
      (let ((hscroll (window-hscroll))
	    (cur-page (doc-view-current-page)))
	(when (= (window-vscroll) (image-scroll-down arg))
	  (doc-view-previous-page)
	  (when (/= cur-page (doc-view-current-page))
	    (image-eob)
	    (image-bol 1))
	  (set-window-hscroll (selected-window) hscroll)))
    (image-scroll-down arg)))

(defun doc-view-next-line-or-next-page (&optional arg)
  "Scroll upward by ARG lines if possible, else goto next page.
When `doc-view-continuous' is non-nil, scrolling a line upward
at the bottom edge of the page moves to the next page."
  (interactive "p")
  (if doc-view-continuous
      (let ((hscroll (window-hscroll))
	    (cur-page (doc-view-current-page)))
	(when (= (window-vscroll) (image-next-line arg))
	  (doc-view-next-page)
	  (when (/= cur-page (doc-view-current-page))
	    (image-bob)
	    (image-bol 1))
	  (set-window-hscroll (selected-window) hscroll)))
    (image-next-line 1)))

(defun doc-view-previous-line-or-previous-page (&optional arg)
  "Scroll downward by ARG lines if possible, else goto previous page.
When `doc-view-continuous' is non-nil, scrolling a line downward
at the top edge of the page moves to the previous page."
  (interactive "p")
  (if doc-view-continuous
      (let ((hscroll (window-hscroll))
	    (cur-page (doc-view-current-page)))
	(when (= (window-vscroll) (image-previous-line arg))
	  (doc-view-previous-page)
	  (when (/= cur-page (doc-view-current-page))
	    (image-eob)
	    (image-bol 1))
	  (set-window-hscroll (selected-window) hscroll)))
    (image-previous-line arg)))

;;;; Utility Functions

(defun doc-view-kill-proc ()
  "Kill the current converter process(es)."
  (interactive)
  (while (consp doc-view-current-converter-processes)
    (ignore-errors ;; Some entries might not be processes, and maybe
		   ;; some are dead already?
      (kill-process (pop doc-view-current-converter-processes))))
  (when doc-view-current-timer
    (cancel-timer doc-view-current-timer)
    (setq doc-view-current-timer nil))
  (setq mode-line-process nil))

(defun doc-view-kill-proc-and-buffer ()
  "Kill the current converter process and buffer."
  (interactive)
  (doc-view-kill-proc)
  (when (eq major-mode 'doc-view-mode)
    (kill-buffer (current-buffer))))

(defun doc-view-make-safe-dir (dir)
  (condition-case nil
      (let ((umask (default-file-modes)))
	(unwind-protect
	    (progn
	      ;; Create temp files with strict access rights.  It's easy to
	      ;; loosen them later, whereas it's impossible to close the
	      ;; time-window of loose permissions otherwise.
	      (set-default-file-modes #o0700)
	      (make-directory dir))
	  ;; Reset the umask.
	  (set-default-file-modes umask)))
    (file-already-exists
     (when (file-symlink-p dir)
       (error "Danger: %s points to a symbolic link" dir))
     ;; In case it was created earlier with looser rights.
     ;; We could check the mode info returned by file-attributes, but it's
     ;; a pain to parse and it may not tell you what we want under
     ;; non-standard file-systems.  So let's just say what we want and let
     ;; the underlying C code and file-system figure it out.
     ;; This also ends up checking a bunch of useful conditions: it makes
     ;; sure we have write-access to the directory and that we own it, thus
     ;; closing a bunch of security holes.
     (condition-case error
	 (set-file-modes dir #o0700)
       (file-error
	(error
	 (format "Unable to use temporary directory %s: %s"
		 dir (mapconcat 'identity (cdr error) " "))))))))

(defun doc-view-current-cache-dir ()
  "Return the directory where the png files of the current doc should be saved.
It's a subdirectory of `doc-view-cache-directory'."
  (if doc-view-current-cache-dir
      doc-view-current-cache-dir
    ;; Try and make sure doc-view-cache-directory exists and is safe.
    (doc-view-make-safe-dir doc-view-cache-directory)
    ;; Now compute the subdirectory to use.
    (setq doc-view-current-cache-dir
	  (file-name-as-directory
	   (expand-file-name
	    (concat (file-name-nondirectory doc-view-buffer-file-name)
		    "-"
		    (let ((file doc-view-buffer-file-name))
		      (with-temp-buffer
			(set-buffer-multibyte nil)
			(insert-file-contents-literally file)
			(md5 (current-buffer)))))
            doc-view-cache-directory)))))

(defun doc-view-remove-if (predicate list)
  "Return LIST with all items removed that satisfy PREDICATE."
  (let (new-list)
    (dolist (item list)
      (when (not (funcall predicate item))
	(setq new-list (cons item new-list))))
     (nreverse new-list)))

;;;###autoload
(defun doc-view-mode-p (type)
  "Return non-nil if document type TYPE is available for `doc-view'.
Document types are symbols like `dvi', `ps', `pdf', or `odf' (any
OpenDocument format)."
  (and (display-graphic-p)
       (or (image-type-available-p 'imagemagick)
	   (image-type-available-p 'png))
       (cond
	((eq type 'dvi)
	 (and (doc-view-mode-p 'pdf)
	      (or (and doc-view-dvipdf-program
		       (executable-find doc-view-dvipdf-program))
		  (and doc-view-dvipdfm-program
		       (executable-find doc-view-dvipdfm-program)))))
	((or (eq type 'postscript) (eq type 'ps) (eq type 'eps)
	     (eq type 'pdf))
	 (and doc-view-ghostscript-program
	      (executable-find doc-view-ghostscript-program)))
	((eq type 'odf)
	 (and doc-view-unoconv-program
	      (executable-find doc-view-unoconv-program)
	      (doc-view-mode-p 'pdf)))
	(t ;; unknown image type
	 nil))))

;;;; Conversion Functions

(defvar doc-view-shrink-factor 1.125)

(defun doc-view-enlarge (factor)
  "Enlarge the document by FACTOR."
  (interactive (list doc-view-shrink-factor))
  (if (eq (plist-get (cdr (doc-view-current-image)) :type)
	  'imagemagick)
      ;; ImageMagick supports on-the-fly-rescaling.
      (let ((new (ceiling (* factor doc-view-image-width))))
        (unless (equal new doc-view-image-width)
          (set (make-local-variable 'doc-view-image-width) new)
          (doc-view-insert-image
           (plist-get (cdr (doc-view-current-image)) :file)
           :width doc-view-image-width)))
    (let ((new (ceiling (* factor doc-view-resolution))))
      (unless (equal new doc-view-resolution)
        (set (make-local-variable 'doc-view-resolution) new)
        (doc-view-reconvert-doc)))))

(defun doc-view-shrink (factor)
  "Shrink the document."
  (interactive (list doc-view-shrink-factor))
  (doc-view-enlarge (/ 1.0 factor)))

(defun doc-view-fit-width-to-window ()
  "Fit the image width to the window width."
  (interactive)
  (let ((win-width (- (nth 2 (window-inside-pixel-edges))
                      (nth 0 (window-inside-pixel-edges))))
        (slice (doc-view-current-slice)))
    (if (not slice)
        (let ((img-width (car (image-display-size
                               (image-get-display-property) t))))
          (doc-view-enlarge (/ (float win-width) (float img-width))))

      ;; If slice is set
      (let* ((slice-width (nth 2 slice))
             (scale-factor (/ (float win-width) (float slice-width)))
             (new-slice (mapcar (lambda (x) (ceiling (* scale-factor x))) slice)))

        (doc-view-enlarge scale-factor)
        (setf (doc-view-current-slice) new-slice)
        (doc-view-goto-page (doc-view-current-page))))))

(defun doc-view-fit-height-to-window ()
  "Fit the image height to the window height."
  (interactive)
  (let ((win-height (- (nth 3 (window-inside-pixel-edges))
                       (nth 1 (window-inside-pixel-edges))))
        (slice (doc-view-current-slice)))
    (if (not slice)
        (let ((img-height (cdr (image-display-size
                                (image-get-display-property) t))))
          ;; When users call 'doc-view-fit-height-to-window',
          ;; they might want to go to next page by typing SPC
          ;; ONLY once. So I used '(- win-height 1)' instead of
          ;; 'win-height'
          (doc-view-enlarge (/ (float (- win-height 1)) (float img-height))))

      ;; If slice is set
      (let* ((slice-height (nth 3 slice))
             (scale-factor (/ (float (- win-height 1)) (float slice-height)))
             (new-slice (mapcar (lambda (x) (ceiling (* scale-factor x))) slice)))

        (doc-view-enlarge scale-factor)
        (setf (doc-view-current-slice) new-slice)
        (doc-view-goto-page (doc-view-current-page))))))

(defun doc-view-fit-page-to-window ()
  "Fit the image to the window.
More specifically, this function enlarges image by:

min {(window-width / image-width), (window-height / image-height)} times."
  (interactive)
  (let ((win-width (- (nth 2 (window-inside-pixel-edges))
                      (nth 0 (window-inside-pixel-edges))))
        (win-height (- (nth 3 (window-inside-pixel-edges))
                       (nth 1 (window-inside-pixel-edges))))
        (slice (doc-view-current-slice)))
    (if (not slice)
        (let ((img-width (car (image-display-size
                               (image-get-display-property) t)))
              (img-height (cdr (image-display-size
                                (image-get-display-property) t))))
          (doc-view-enlarge (min (/ (float win-width) (float img-width))
                                 (/ (float (- win-height 1))
                                    (float img-height)))))
      ;; If slice is set
      (let* ((slice-width (nth 2 slice))
             (slice-height (nth 3 slice))
             (scale-factor (min (/ (float win-width) (float slice-width))
                                (/ (float (- win-height 1))
                                   (float slice-height))))
             (new-slice (mapcar (lambda (x) (ceiling (* scale-factor x))) slice)))
        (doc-view-enlarge scale-factor)
        (setf (doc-view-current-slice) new-slice)
        (doc-view-goto-page (doc-view-current-page))))))

(defun doc-view-reconvert-doc ()
  "Reconvert the current document.
Should be invoked when the cached images aren't up-to-date."
  (interactive)
  (doc-view-kill-proc)
  ;; Clear the old cached files
  (when (file-exists-p (doc-view-current-cache-dir))
    (delete-directory (doc-view-current-cache-dir) 'recursive))
  (kill-local-variable 'doc-view-last-page-number)
  (doc-view-initiate-display))

(defun doc-view-sentinel (proc event)
  "Generic sentinel for doc-view conversion processes."
  (if (not (string-match "finished" event))
      (message "DocView: process %s changed status to %s."
               (process-name proc)
	       (if (string-match "\\(.+\\)\n?\\'" event)
		   (match-string 1 event)
		 event))
    (when (buffer-live-p (process-get proc 'buffer))
      (with-current-buffer (process-get proc 'buffer)
        (setq doc-view-current-converter-processes
              (delq proc doc-view-current-converter-processes))
        (setq mode-line-process
              (if doc-view-current-converter-processes
                  (format ":%s" (car doc-view-current-converter-processes))))
        (funcall (process-get proc 'callback))))))

(defun doc-view-start-process (name program args callback)
  ;; Make sure the process is started in an existing directory, (rather than
  ;; some file-name-handler-managed dir, for example).
  (let* ((default-directory (if (file-readable-p default-directory)
				default-directory
			      (expand-file-name "~/")))
         (proc (apply 'start-process name doc-view-conversion-buffer
                      program args)))
    (push proc doc-view-current-converter-processes)
    (setq mode-line-process (list (format ":%s" proc)))
    (set-process-sentinel proc 'doc-view-sentinel)
    (process-put proc 'buffer   (current-buffer))
    (process-put proc 'callback callback)))

(defun doc-view-dvi->pdf (dvi pdf callback)
  "Convert DVI to PDF asynchronously and call CALLBACK when finished."
  ;; Prefer dvipdf over dvipdfm, because the latter has problems if the DVI
  ;; references and includes other PS files.
  (if (and doc-view-dvipdf-program
	   (executable-find doc-view-dvipdf-program))
      (doc-view-start-process "dvi->pdf" doc-view-dvipdf-program
			      (list dvi pdf)
			      callback)
    (doc-view-start-process "dvi->pdf" doc-view-dvipdfm-program
			    (list "-o" pdf dvi)
			    callback)))

(defun doc-view-odf->pdf (odf callback)
  "Convert ODF to PDF asynchronously and call CALLBACK when finished.
The converted PDF is put into the current cache directory, and it
is named like ODF with the extension turned to pdf."
  (doc-view-start-process "odf->pdf" doc-view-unoconv-program
			  (list "-f" "pdf" "-o" (doc-view-current-cache-dir) odf)
			  callback))

(defun doc-view-pdf/ps->png (pdf-ps png)
  "Convert PDF-PS to PNG asynchronously."
  (doc-view-start-process
   "pdf/ps->png" doc-view-ghostscript-program
   (append doc-view-ghostscript-options
           (list (format "-r%d" (round doc-view-resolution))
                 (concat "-sOutputFile=" png)
                 pdf-ps))
   (let ((resolution doc-view-resolution))
     (lambda ()
       ;; Only create the resolution file when it's all done, so it also
       ;; serves as a witness that the conversion is complete.
       (write-region (prin1-to-string resolution) nil
                     (expand-file-name "resolution.el"
                                       (doc-view-current-cache-dir))
                     nil 'silently)
       (when doc-view-current-timer
         (cancel-timer doc-view-current-timer)
         (setq doc-view-current-timer nil))
       (doc-view-display (current-buffer) 'force))))
  ;; Update the displayed pages as soon as they're done generating.
  (when doc-view-conversion-refresh-interval
    (setq doc-view-current-timer
          (run-at-time "1 secs" doc-view-conversion-refresh-interval
                       'doc-view-display
                       (current-buffer)))))

(defun doc-view-pdf->png-1 (pdf png page callback)
  "Convert a PAGE of a PDF file to PNG asynchronously.
Call CALLBACK with no arguments when done."
  (doc-view-start-process
   "pdf->png-1" doc-view-ghostscript-program
   (append doc-view-ghostscript-options
           (list (format "-r%d" (round doc-view-resolution))
                 ;; Sadly, `gs' only supports the page-range
                 ;; for PDF files.
                 (format "-dFirstPage=%d" page)
                 (format "-dLastPage=%d" page)
                 (concat "-sOutputFile=" png)
                 pdf))
   callback))

(declare-function clear-image-cache "image.c" (&optional filter))

(defun doc-view-pdf->png (pdf png pages)
  "Convert a PDF file to PNG asynchronously.
Start by converting PAGES, and then the rest."
  (if (null pages)
      (doc-view-pdf/ps->png pdf png)
    ;; We could render several `pages' with a single process if they're
    ;; (almost) consecutive, but since in 99% of the cases, there'll be only
    ;; a single page anyway, and of the remaining 1%, few cases will have
    ;; consecutive pages, it's not worth the trouble.
    (let ((rest (cdr pages)))
      (doc-view-pdf->png-1
       pdf (format png (car pages)) (car pages)
       (lambda ()
         (if rest
             (doc-view-pdf->png pdf png rest)
           ;; Yippie, the important pages are done, update the display.
           (clear-image-cache)
           ;; For the windows that have a message (like "Welcome to
           ;; DocView") display property, clearing the image cache is
           ;; not sufficient.
           (dolist (win (get-buffer-window-list (current-buffer) nil 'visible))
             (with-selected-window win
				   (when (stringp (get-char-property (point-min) 'display))
				     (doc-view-goto-page (doc-view-current-page)))))
           ;; Convert the rest of the pages.
           (doc-view-pdf/ps->png pdf png)))))))

(defun doc-view-pdf->txt (pdf txt callback)
  "Convert PDF to TXT asynchronously and call CALLBACK when finished."
  (or (executable-find doc-view-pdftotext-program)
      (error "You need the `pdftotext' program to convert a PDF to text"))
  (doc-view-start-process "pdf->txt" doc-view-pdftotext-program
                          (list "-raw" pdf txt)
                          callback))

(defun doc-view-current-cache-doc-pdf ()
  "Return the name of the doc.pdf in the current cache dir.
  This file exists only if the current document isn't a PDF or PS file already."
  (expand-file-name "doc.pdf" (doc-view-current-cache-dir)))

(defun doc-view-doc->txt (txt callback)
  "Convert the current document to text and call CALLBACK when done."
  (make-directory (doc-view-current-cache-dir) t)
  (pcase doc-view-doc-type
    (`pdf
     ;; Doc is a PDF, so convert it to TXT
     (doc-view-pdf->txt doc-view-buffer-file-name txt callback))
    (`ps
     ;; Doc is a PS, so convert it to PDF (which will be converted to
     ;; TXT thereafter).
     (let ((pdf (doc-view-current-cache-doc-pdf)))
       (doc-view-ps->pdf doc-view-buffer-file-name pdf
                         (lambda () (doc-view-pdf->txt pdf txt callback)))))
    (`dvi
     ;; Doc is a DVI.  This means that a doc.pdf already exists in its
     ;; cache subdirectory.
     (doc-view-pdf->txt (doc-view-current-cache-doc-pdf) txt callback))
    (`odf
     ;; Doc is some ODF (or MS Office) doc.  This means that a doc.pdf
     ;; already exists in its cache subdirectory.
     (doc-view-pdf->txt (doc-view-current-cache-doc-pdf) txt callback))
    (_ (error "DocView doesn't know what to do"))))

(defun doc-view-ps->pdf (ps pdf callback)
  "Convert PS to PDF asynchronously and call CALLBACK when finished."
  (or (executable-find doc-view-ps2pdf-program)
      (error "You need the `ps2pdf' program to convert PS to PDF"))
  (doc-view-start-process "ps->pdf" doc-view-ps2pdf-program
                          (list
                           ;; Avoid security problems when rendering files from
                           ;; untrusted sources.
                           "-dSAFER"
                           ;; in-file and out-file
                           ps pdf)
                          callback))

(defun doc-view-active-pages ()
  (let ((pages ()))
    (dolist (win (get-buffer-window-list (current-buffer) nil 'visible))
      (let ((page (image-mode-window-get 'page win)))
        (unless (memq page pages) (push page pages))))
    pages))

(defun doc-view-convert-current-doc ()
  "Convert `doc-view-buffer-file-name' to a set of png files, one file per page.
Those files are saved in the directory given by the function
`doc-view-current-cache-dir'."
  ;; Let stale files still display while we recompute the new ones, so only
  ;; flush the cache when the conversion is over.  One of the reasons why it
  ;; is important to keep displaying the stale page is so that revert-buffer
  ;; preserves the horizontal/vertical scroll settings (which are otherwise
  ;; resets during the redisplay).
  (setq doc-view-pending-cache-flush t)
  (let ((png-file (expand-file-name "page-%d.png"
                                    (doc-view-current-cache-dir))))
    (make-directory (doc-view-current-cache-dir) t)
    (pcase doc-view-doc-type
      (`dvi
       ;; DVI files have to be converted to PDF before Ghostscript can process
       ;; it.
       (let ((pdf (doc-view-current-cache-doc-pdf)))
         (doc-view-dvi->pdf doc-view-buffer-file-name pdf
                            (lambda () (doc-view-pdf/ps->png pdf png-file)))))
      (`odf
       ;; ODF files have to be converted to PDF before Ghostscript can
       ;; process it.
       (let ((pdf (doc-view-current-cache-doc-pdf))
             (opdf (expand-file-name (concat (file-name-base doc-view-buffer-file-name)
                                             ".pdf")
                                     doc-view-current-cache-dir))
             (png-file png-file))
	 ;; The unoconv tool only supports a output directory, but no
	 ;; file name.  It's named like the input file with the
	 ;; extension replaced by pdf.
         (doc-view-odf->pdf doc-view-buffer-file-name
                            (lambda ()
			      ;; Rename to doc.pdf
			      (rename-file opdf pdf)
			      (doc-view-pdf/ps->png pdf png-file)))))
      (`pdf
       (let ((pages (doc-view-active-pages)))
         ;; Convert PDF to PNG images starting with the active pages.
         (doc-view-pdf->png doc-view-buffer-file-name png-file pages)))
      (_
       ;; Convert to PNG images.
       (doc-view-pdf/ps->png doc-view-buffer-file-name png-file)))))

;;;; Slicing

(declare-function image-size "image.c" (spec &optional pixels frame))

(defun doc-view-set-slice (x y width height)
  "Set the slice of the images that should be displayed.
You can use this function to tell doc-view not to display the
margins of the document.  It prompts for the top-left corner (X
and Y) of the slice to display and its WIDTH and HEIGHT.

See `doc-view-set-slice-using-mouse' and
`doc-view-set-slice-from-bounding-box' for more convenient ways
to do that.  To reset the slice use `doc-view-reset-slice'."
  (interactive
   (let* ((size (image-size (doc-view-current-image) t))
	  (a (read-number (format "Top-left X (0..%d): " (car size))))
	  (b (read-number (format "Top-left Y (0..%d): " (cdr size))))
	  (c (read-number (format "Width (0..%d): " (- (car size) a))))
	  (d (read-number (format "Height (0..%d): " (- (cdr size) b)))))
     (list a b c d)))
  (setf (doc-view-current-slice) (list x y width height))
  ;; Redisplay
  (doc-view-goto-page (doc-view-current-page)))

(defun doc-view-set-slice-using-mouse ()
  "Set the slice of the images that should be displayed.
You set the slice by pressing mouse-1 at its top-left corner and
dragging it to its bottom-right corner.  See also
`doc-view-set-slice' and `doc-view-reset-slice'."
  (interactive)
  (let (x y w h done)
    (while (not done)
      (let ((e (read-event
		(concat "Press mouse-1 at the top-left corner and "
			"drag it to the bottom-right corner!"))))
	(when (eq (car e) 'drag-mouse-1)
	  (setq x (car (posn-object-x-y (event-start e))))
	  (setq y (cdr (posn-object-x-y (event-start e))))
	  (setq w (- (car (posn-object-x-y (event-end e))) x))
	  (setq h (- (cdr (posn-object-x-y (event-end e))) y))
	  (setq done t))))
    (doc-view-set-slice x y w h)))

(defun doc-view-get-bounding-box ()
  "Get the BoundingBox information of the current page."
  (let* ((page (doc-view-current-page))
	 (doc (let ((cache-doc (doc-view-current-cache-doc-pdf)))
		(if (file-exists-p cache-doc)
		    cache-doc
		  doc-view-buffer-file-name)))
	 (o (shell-command-to-string
	     (concat doc-view-ghostscript-program
		     " -dSAFER -dBATCH -dNOPAUSE -q -sDEVICE=bbox "
		     (format "-dFirstPage=%s -dLastPage=%s %s"
			     page page doc)))))
    (save-match-data
      (when (string-match (concat "%%BoundingBox: "
				  "\\([[:digit:]]+\\) \\([[:digit:]]+\\) "
				  "\\([[:digit:]]+\\) \\([[:digit:]]+\\)") o)
	(mapcar #'string-to-number
		(list (match-string 1 o)
		      (match-string 2 o)
		      (match-string 3 o)
		      (match-string 4 o)))))))

(defvar doc-view-paper-sizes
  '((a4 595 842)
    (a4-landscape 842 595)
    (letter 612 792)
    (letter-landscape 792 612)
    (legal 612 1008)
    (legal-landscape 1008 612)
    (a3 842 1191)
    (a3-landscape 1191 842)
    (tabloid 792 1224)
    (ledger 1224 792))
  "An alist from paper size names to dimensions.")

(defun doc-view-guess-paper-size (iw ih)
  "Guess the paper size according to the aspect ratio."
  (cl-labels ((div (x y)
		   (round (/ (* 100.0 x) y))))
    (let ((ar (div iw ih))
	  (al (mapcar (lambda (l)
			(list (div (nth 1 l) (nth 2 l)) (car l)))
		      doc-view-paper-sizes)))
      (cadr (assoc ar al)))))

(defun doc-view-scale-bounding-box (ps iw ih bb)
  (list (/ (* (nth 0 bb) iw) (nth 1 (assoc ps doc-view-paper-sizes)))
	(/ (* (nth 1 bb) ih) (nth 2 (assoc ps doc-view-paper-sizes)))
	(/ (* (nth 2 bb) iw) (nth 1 (assoc ps doc-view-paper-sizes)))
	(/ (* (nth 3 bb) ih) (nth 2 (assoc ps doc-view-paper-sizes)))))

(defun doc-view-set-slice-from-bounding-box (&optional force-paper-size)
  "Set the slice from the document's BoundingBox information.
The result is that the margins are almost completely cropped,
much more accurate than could be done manually using
`doc-view-set-slice-using-mouse'."
  (interactive "P")
  (let ((bb (doc-view-get-bounding-box)))
    (if (not bb)
	(message "BoundingBox couldn't be determined")
      (let* ((is (image-size (doc-view-current-image) t))
	     (iw (car is))
	     (ih (cdr is))
	     (ps (or (and (null force-paper-size) (doc-view-guess-paper-size iw ih))
		     (intern (completing-read "Paper size: "
					      (mapcar #'car doc-view-paper-sizes)
					      nil t))))
	     (bb (doc-view-scale-bounding-box ps iw ih bb))
	     (x1 (nth 0 bb))
	     (y1 (nth 1 bb))
	     (x2 (nth 2 bb))
	     (y2 (nth 3 bb)))
	;; We keep a 2 pixel margin.
	(doc-view-set-slice (- x1 2) (- ih y2 2)
			    (+ (- x2 x1) 4) (+ (- y2 y1) 4))))))

(defun doc-view-reset-slice ()
  "Reset the current slice.
After calling this function whole pages will be visible again."
  (interactive)
  (setf (doc-view-current-slice) nil)
  ;; Redisplay
  (doc-view-goto-page (doc-view-current-page)))

;;;; Display

(defun doc-view-insert-image (file &rest args)
  "Insert the given png FILE.
ARGS is a list of image descriptors."
  (when doc-view-pending-cache-flush
    (clear-image-cache)
    (setq doc-view-pending-cache-flush nil))
  (let ((ol (doc-view-current-overlay))
        (image (if (and file (file-readable-p file))
		   (if (not (fboundp 'imagemagick-types))
		       (apply 'create-image file 'png nil args)
		     (unless (member :width args)
		       (setq args (append args (list :width doc-view-image-width))))
		     (apply 'create-image file 'imagemagick nil args))))
        (slice (doc-view-current-slice)))
    (setf (doc-view-current-image) image)
    (move-overlay ol (point-min) (point-max))
    (overlay-put ol 'display
                 (cond
                  (image
                   (if slice
                       (list (cons 'slice slice) image)
                     image))
                  ;; We're trying to display a page that doesn't exist.
                  (doc-view-current-converter-processes
                   ;; Maybe the page doesn't exist *yet*.
                   "Cannot display this page (yet)!")
                  (t
                   ;; Typically happens if the conversion process somehow
                   ;; failed.  Better not signal an error here because it
                   ;; could prevent a subsequent reconversion from fixing
                   ;; the problem.
                   (concat "Cannot display this page!\n"
                           "Maybe because of a conversion failure!"))))
    (let ((win (overlay-get ol 'window)))
      (if (stringp (overlay-get ol 'display))
          (progn            ;Make sure the text is not scrolled out of view.
            (set-window-hscroll win 0)
            (set-window-vscroll win 0))
        (let ((hscroll (image-mode-window-get 'hscroll win))
              (vscroll (image-mode-window-get 'vscroll win)))
          ;; Reset scroll settings, in case they were changed.
          (if hscroll (set-window-hscroll win hscroll))
          (if vscroll (set-window-vscroll win vscroll)))))))

(defun doc-view-sort (a b)
  "Return non-nil if A should be sorted before B.
Predicate for sorting `doc-view-current-files'."
  (or (< (length a) (length b))
      (and (= (length a) (length b))
           (string< a b))))

(defun doc-view-display (buffer &optional force)
  "Start viewing the document in BUFFER.
If FORCE is non-nil, start viewing even if the document does not
have the page we want to view."
  (with-current-buffer buffer
    (let ((prev-pages doc-view-current-files))
      (setq doc-view-current-files
            (sort (directory-files (doc-view-current-cache-dir) t
                                   "page-[0-9]+\\.png" t)
                  'doc-view-sort))
      (dolist (win (or (get-buffer-window-list buffer nil t)
		       (list t)))
	(let* ((page (doc-view-current-page win))
	       (pagefile (expand-file-name (format "page-%d.png" page)
					   (doc-view-current-cache-dir))))
	  (when (or force
		    (and (not (member pagefile prev-pages))
			 (member pagefile doc-view-current-files)))
	    (if (windowp win)
		(with-selected-window win
		  (cl-assert (eq (current-buffer) buffer) t)
		  (doc-view-goto-page page))
	      (doc-view-goto-page page))))))))

(defun doc-view-buffer-message ()
  ;; Only show this message initially, not when refreshing the buffer (in which
  ;; case it's better to keep displaying the "stale" page while computing
  ;; the fresh new ones).
  (unless (overlay-get (doc-view-current-overlay) 'display)
    (overlay-put (doc-view-current-overlay) 'display
                 (concat (propertize "Welcome to DocView!" 'face 'bold)
                         "\n"
                         "
If you see this buffer it means that the document you want to view is being
converted to PNG and the conversion of the first page hasn't finished yet or
`doc-view-conversion-refresh-interval' is set to nil.

For now these keys are useful:

`q' : Bury this buffer.  Conversion will go on in background.
`k' : Kill the conversion process and this buffer.
`K' : Kill the conversion process.\n"))))

(declare-function tooltip-show "tooltip" (text &optional use-echo-area))

(defun doc-view-show-tooltip ()
  (interactive)
  (tooltip-show (doc-view-current-info)))

(defun doc-view-open-text ()
  "Open a buffer with the current doc's contents as text."
  (interactive)
  (if doc-view-current-converter-processes
      (message "DocView: please wait till conversion finished.")
    (let ((txt (expand-file-name "doc.txt" (doc-view-current-cache-dir))))
      (if (file-readable-p txt)
	  (let ((name (concat "Text contents of "
			      (file-name-nondirectory buffer-file-name)))
		(dir (file-name-directory buffer-file-name)))
	    (with-current-buffer (find-file txt)
	      (rename-buffer name)
	      (setq default-directory dir)))
	(doc-view-doc->txt txt 'doc-view-open-text)))))

;;;;; Toggle between editing and viewing

(defvar-local doc-view-saved-settings nil
  "Doc-view settings saved while in some other mode.")
(put 'doc-view-saved-settings 'permanent-local t)

(defun doc-view-toggle-display ()
  "Toggle between editing a document as text or viewing it."
  (interactive)
  (if (eq major-mode 'doc-view-mode)
      ;; Switch to editing mode
      (progn
	(doc-view-kill-proc)
	(setq buffer-read-only nil)
	(remove-overlays (point-min) (point-max) 'doc-view t)
	(set (make-local-variable 'image-mode-winprops-alist) t)
	;; Switch to the previously used major mode or fall back to
	;; normal mode.
	(doc-view-fallback-mode)
	(doc-view-minor-mode 1))
    ;; Switch to doc-view-mode
    (when (and (buffer-modified-p)
	       (y-or-n-p "The buffer has been modified.  Save the changes? "))
      (save-buffer))
    (doc-view-mode)))

;;;; Searching


(defun doc-view-search-internal (regexp file)
  "Return a list of FILE's pages that contain text matching REGEXP.
The value is an alist of the form (PAGE CONTEXTS) where PAGE is
the pagenumber and CONTEXTS are all lines of text containing a match."
  (with-temp-buffer
    (insert-file-contents file)
    (let ((page 1)
	  (lastpage 1)
	  matches)
      (while (re-search-forward (concat "\\(?:\\([]\\)\\|\\("
					regexp "\\)\\)") nil t)
	(when (match-string 1) (setq page (1+ page)))
	(when (match-string 2)
	  (if (/= page lastpage)
	      (push (cons page
			  (list (buffer-substring
				 (line-beginning-position)
				 (line-end-position))))
		    matches)
	    (setq matches (cons
			   (append
			    (or
			     ;; This page already is a match.
			     (car matches)
			     ;; This is the first match on page.
			     (list page))
			    (list (buffer-substring
				   (line-beginning-position)
				   (line-end-position))))
			   (cdr matches))))
	  (setq lastpage page)))
      (nreverse matches))))

(defun doc-view-search-no-of-matches (list)
  "Extract the number of matches from the search result LIST."
  (let ((no 0))
    (dolist (p list)
      (setq no (+ no (1- (length p)))))
    no))

(defun doc-view-search-backward (new-query)
  "Call `doc-view-search' for backward search.
If prefix NEW-QUERY is given, ask for a new regexp."
  (interactive "P")
  (doc-view-search new-query t))

(defun doc-view-search (new-query &optional backward)
  "Jump to the next match or initiate a new search if NEW-QUERY is given.
If the current document hasn't been transformed to plain text
till now do that first.
If BACKWARD is non-nil, jump to the previous match."
  (interactive "P")
  (if (and (not new-query)
	   doc-view-current-search-matches)
      (if backward
	  (doc-view-search-previous-match 1)
	(doc-view-search-next-match 1))
    ;; New search, so forget the old results.
    (setq doc-view-current-search-matches nil)
    (let ((txt (expand-file-name "doc.txt"
				 (doc-view-current-cache-dir))))
      (if (file-readable-p txt)
	  (progn
	    (setq doc-view-current-search-matches
		  (doc-view-search-internal
		   (read-from-minibuffer "Regexp: ")
		   txt))
	    (message "DocView: search yielded %d matches."
		     (doc-view-search-no-of-matches
		      doc-view-current-search-matches)))
	;; We must convert to TXT first!
	(if doc-view-current-converter-processes
	    (message "DocView: please wait till conversion finished.")
	  (doc-view-doc->txt txt (lambda () (doc-view-search nil))))))))

(defun doc-view-search-next-match (arg)
  "Go to the ARGth next matching page."
  (interactive "p")
  (let* ((next-pages (doc-view-remove-if
		      (lambda (i) (<= (car i) (doc-view-current-page)))
		      doc-view-current-search-matches))
	 (page (car (nth (1- arg) next-pages))))
    (if page
	(doc-view-goto-page page)
      (when (and
	     doc-view-current-search-matches
	     (y-or-n-p "No more matches after current page.  Wrap to first match? "))
	(doc-view-goto-page (caar doc-view-current-search-matches))))))

(defun doc-view-search-previous-match (arg)
  "Go to the ARGth previous matching page."
  (interactive "p")
  (let* ((prev-pages (doc-view-remove-if
		      (lambda (i) (>= (car i) (doc-view-current-page)))
		      doc-view-current-search-matches))
	 (page (car (nth (1- arg) (nreverse prev-pages)))))
    (if page
	(doc-view-goto-page page)
      (when (and
	     doc-view-current-search-matches
	     (y-or-n-p "No more matches before current page.  Wrap to last match? "))
	(doc-view-goto-page (caar (last doc-view-current-search-matches)))))))

;;;; User interface commands and the mode

(put 'doc-view-mode 'mode-class 'special)

(defun doc-view-already-converted-p ()
  "Return non-nil if the current doc was already converted."
  (and (file-exists-p (doc-view-current-cache-dir))
       ;; Check that the resolution info is there, otherwise it means
       ;; the conversion is incomplete.
       (file-readable-p (expand-file-name "resolution.el"
                                          (doc-view-current-cache-dir)))
       (> (length (directory-files (doc-view-current-cache-dir)
                                   nil "\\.png\\'"))
          0)))

(defun doc-view-initiate-display ()
  ;; Switch to image display if possible
  (if (doc-view-mode-p doc-view-doc-type)
      (progn
	(doc-view-buffer-message)
	(setf (doc-view-current-page) (or (doc-view-current-page) 1))
	(if (doc-view-already-converted-p)
	    (progn
	      (message "DocView: using cached files!")
	      ;; Load the saved resolution
	      (let* ((res-file (expand-file-name "resolution.el"
                                                 (doc-view-current-cache-dir)))
                     (res
                      (with-temp-buffer
                        (when (file-readable-p res-file)
                          (insert-file-contents res-file)
                          (read (current-buffer))))))
                (when (numberp res)
		  (set (make-local-variable 'doc-view-resolution) res)))
	      (doc-view-display (current-buffer) 'force))
	  (doc-view-convert-current-doc))
	(message
	 "%s"
	 (substitute-command-keys
	  (concat "Type \\[doc-view-toggle-display] to toggle between "
		  "editing or viewing the document."))))
    (message
     "%s"
     (concat "No PNG support is available, or some conversion utility for "
	     (file-name-extension doc-view-buffer-file-name)
	     " files is missing."))
    (when (and (executable-find doc-view-pdftotext-program)
	       (y-or-n-p
		"Unable to render file.  View extracted text instead? "))
      (doc-view-open-text))
    (doc-view-toggle-display)))

(defvar bookmark-make-record-function)

(defun doc-view-clone-buffer-hook ()
  ;; FIXME: There are several potential problems linked with reconversion
  ;; and auto-revert when we have indirect buffers because they share their
  ;; /tmp cache directory.  This sharing is good (you'd rather not reconvert
  ;; for each clone), but that means that clones need to collaborate a bit.
  ;; I guess it mostly means: detect when a reconversion process is already
  ;; running, and run the sentinel in all clones.
  ;;
  ;; Maybe the clones should really have a separate /tmp directory
  ;; so they could have a different resolution and you could use clones
  ;; for zooming.
  (remove-overlays (point-min) (point-max) 'doc-view t)
  (if (consp image-mode-winprops-alist) (setq image-mode-winprops-alist nil)))

(defun doc-view-intersection (l1 l2)
  (let ((l ()))
    (dolist (x l1) (if (memq x l2) (push x l)))
    l))

(defun doc-view-set-doc-type ()
  "Figure out the current document type (`doc-view-doc-type')."
  (let ((name-types
	 (when buffer-file-name
	   (cdr (assoc (file-name-extension buffer-file-name)
		       '(
			 ;; DVI
			 ("dvi" dvi)
			 ;; PDF
			 ("pdf" pdf) ("epdf" pdf)
			 ;; PostScript
			 ("ps" ps) ("eps" ps)
			 ;; OpenDocument formats
			 ("odt" odf) ("ods" odf) ("odp" odf) ("odg" odf)
			 ("odc" odf) ("odi" odf) ("odm" odf) ("ott" odf)
			 ("ots" odf) ("otp" odf) ("otg" odf)
			 ;; Microsoft Office formats (also handled
			 ;; by the odf conversion chain)
			 ("doc" odf) ("docx" odf) ("xls" odf) ("xlsx" odf)
			 ("ppt" odf) ("pptx" odf))))))
	(content-types
	 (save-excursion
	   (goto-char (point-min))
	   (cond
	    ((looking-at "%!") '(ps))
	    ((looking-at "%PDF") '(pdf))
	    ((looking-at "\367\002") '(dvi))))))
    (set (make-local-variable 'doc-view-doc-type)
	 (car (or (doc-view-intersection name-types content-types)
		  (when (and name-types content-types)
		    (error "Conflicting types: name says %s but content says %s"
			   name-types content-types))
		  name-types content-types
		  (error "Cannot determine the document type"))))))

;;;###autoload
(defun doc-view-mode ()
  "Major mode in DocView buffers.

DocView Mode is an Emacs document viewer.  It displays PDF, PS
and DVI files (as PNG images) in Emacs buffers.

You can use \\<doc-view-mode-map>\\[doc-view-toggle-display] to
toggle between displaying the document or editing it as text.
\\{doc-view-mode-map}"
  (interactive)

  (if (= (point-min) (point-max))
      ;; The doc is empty or doesn't exist at all, so fallback to
      ;; another mode.  We used to also check file-exists-p, but this
      ;; returns nil for tar members.
      (doc-view-fallback-mode)

    (let* ((prev-major-mode (if (derived-mode-p 'doc-view-mode)
				doc-view-previous-major-mode
			      (unless (eq major-mode 'fundamental-mode)
				major-mode))))
      (kill-all-local-variables)
      (set (make-local-variable 'doc-view-previous-major-mode)
           prev-major-mode))

    (dolist (var doc-view-saved-settings)
      (set (make-local-variable (car var)) (cdr var)))

    ;; Figure out the document type.
    (unless doc-view-doc-type
      (doc-view-set-doc-type))

    (doc-view-make-safe-dir doc-view-cache-directory)
    ;; Handle compressed files, remote files, files inside archives
    (set (make-local-variable 'doc-view-buffer-file-name)
	 (cond
	  (jka-compr-really-do-compress
           ;; FIXME: there's a risk of name conflicts here.
	   (expand-file-name
	    (file-name-nondirectory
	     (file-name-sans-extension buffer-file-name))
	    doc-view-cache-directory))
	  ;; Is the file readable by local processes?
	  ;; We used to use `file-remote-p' but it's unclear what it's
	  ;; supposed to return nil for things like local files accessed via
	  ;; `su' or via file://...
	  ((let ((file-name-handler-alist nil))
	     (not (and buffer-file-name (file-readable-p buffer-file-name))))
           ;; FIXME: there's a risk of name conflicts here.
	   (expand-file-name
	    (if buffer-file-name
                (file-name-nondirectory buffer-file-name)
              (buffer-name))
            doc-view-cache-directory))
	  (t buffer-file-name)))
    (when (not (string= doc-view-buffer-file-name buffer-file-name))
      (write-region nil nil doc-view-buffer-file-name))

    (add-hook 'change-major-mode-hook
	      (lambda ()
		(doc-view-kill-proc)
		(remove-overlays (point-min) (point-max) 'doc-view t))
	      nil t)
    (add-hook 'clone-indirect-buffer-hook 'doc-view-clone-buffer-hook nil t)
    (add-hook 'kill-buffer-hook 'doc-view-kill-proc nil t)

    (remove-overlays (point-min) (point-max) 'doc-view t) ;Just in case.
    ;; Keep track of display info ([vh]scroll, page number, overlay,
    ;; ...)  for each window in which this document is shown.
    (add-hook 'image-mode-new-window-functions
	      'doc-view-new-window-function nil t)
    (image-mode-setup-winprops)

    (set (make-local-variable 'mode-line-position)
	 '(" P" (:eval (number-to-string (doc-view-current-page)))
	   "/" (:eval (number-to-string (doc-view-last-page-number)))))
    ;; Don't scroll unless the user specifically asked for it.
    (set (make-local-variable 'auto-hscroll-mode) nil)
    (set (make-local-variable 'mwheel-scroll-up-function)
	 'doc-view-scroll-up-or-next-page)
    (set (make-local-variable 'mwheel-scroll-down-function)
	 'doc-view-scroll-down-or-previous-page)
    (set (make-local-variable 'cursor-type) nil)
    (use-local-map doc-view-mode-map)
    (set (make-local-variable 'after-revert-hook) 'doc-view-reconvert-doc)
    (set (make-local-variable 'bookmark-make-record-function)
	 'doc-view-bookmark-make-record)
    (setq mode-name "DocView"
	  buffer-read-only t
	  major-mode 'doc-view-mode)
    (doc-view-initiate-display)
    ;; Switch off view-mode explicitly, because doc-view-mode is the
    ;; canonical view mode for PDF/PS/DVI files.  This could be
    ;; switched on automatically depending on the value of
    ;; `view-read-only'.
    (set (make-local-variable 'view-read-only) nil)
    (run-mode-hooks 'doc-view-mode-hook)))

(defun doc-view-fallback-mode ()
  "Fallback to the previous or next best major mode."
  (let ((vars (if (derived-mode-p 'doc-view-mode)
                  (mapcar (lambda (var) (cons var (symbol-value var)))
                          '(doc-view-resolution
                            image-mode-winprops-alist)))))
    (if doc-view-previous-major-mode
        (funcall doc-view-previous-major-mode)
      (let ((auto-mode-alist
             (rassq-delete-all
              'doc-view-mode-maybe
              (rassq-delete-all 'doc-view-mode
                                (copy-alist auto-mode-alist)))))
        (normal-mode)))
    (when vars
      (setq-local doc-view-saved-settings vars))))

;;;###autoload
(defun doc-view-mode-maybe ()
  "Switch to `doc-view-mode' if possible.
If the required external tools are not available, then fallback
to the next best mode."
  (condition-case nil
      (doc-view-set-doc-type)
    (error (doc-view-fallback-mode)))
  (if (doc-view-mode-p doc-view-doc-type)
      (doc-view-mode)
    (doc-view-fallback-mode)))

;;;###autoload
(define-minor-mode doc-view-minor-mode
  "Toggle displaying buffer via Doc View (Doc View minor mode).
With a prefix argument ARG, enable Doc View minor mode if ARG is
positive, and disable it otherwise.  If called from Lisp, enable
the mode if ARG is omitted or nil.

See the command `doc-view-mode' for more information on this mode."
  nil " DocView" doc-view-minor-mode-map
  :group 'doc-view
  (when doc-view-minor-mode
    (add-hook 'change-major-mode-hook (lambda () (doc-view-minor-mode -1)) nil t)
    (message
     "%s"
     (substitute-command-keys
      "Type \\[doc-view-toggle-display] to toggle between editing or viewing the document."))))

(defun doc-view-clear-cache ()
  "Delete the whole cache (`doc-view-cache-directory')."
  (interactive)
  (dired-delete-file doc-view-cache-directory 'always))

(defun doc-view-dired-cache ()
  "Open `dired' in `doc-view-cache-directory'."
  (interactive)
  (dired doc-view-cache-directory))


;;;; Bookmark integration

(declare-function bookmark-make-record-default
                  "bookmark" (&optional no-file no-context posn))
(declare-function bookmark-prop-get "bookmark" (bookmark prop))
(declare-function bookmark-default-handler "bookmark" (bmk))

(defun doc-view-bookmark-make-record ()
  (nconc (bookmark-make-record-default)
         `((page     . ,(doc-view-current-page))
           (handler  . doc-view-bookmark-jump))))


;;;###autoload
(defun doc-view-bookmark-jump (bmk)
  ;; This implements the `handler' function interface for record type
  ;; returned by `doc-view-bookmark-make-record', which see.
  (prog1 (bookmark-default-handler bmk)
    (let ((page (bookmark-prop-get bmk 'page)))
      (when (not (eq major-mode 'doc-view-mode))
        (doc-view-toggle-display))
      (with-selected-window
       (or (get-buffer-window (current-buffer) 0)
	   (selected-window))
       (doc-view-goto-page page)))))


(provide 'doc-view)

;; Local Variables:
;; eval: (outline-minor-mode 1)
;; End:

;;; doc-view.el ends here