unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
blob 5278a1a84ddcf5c6e00668835f6396b8df06fd46 75579 bytes (raw)
name: lisp/man.el 	 # note: path name is non-authoritative(*)

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
 
;;; man.el --- browse UNIX manual pages -*- lexical-binding: t -*-

;; Copyright (C) 1993-1994, 1996-1997, 2001-2020 Free Software
;; Foundation, Inc.

;; Author: Barry A. Warsaw <bwarsaw@cen.com>
;; Maintainer: emacs-devel@gnu.org
;; Keywords: help
;; Adapted-By: ESR, pot

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; This code provides a function, `man', with which you can browse
;; UNIX manual pages.  Formatting is done in background so that you
;; can continue to use your Emacs while processing is going on.
;;
;; The mode also supports hypertext-like following of manual page SEE
;; ALSO references, and other features.  See below or do `?' in a
;; manual page buffer for details.

;; ========== Credits and History ==========
;; In mid 1991, several people posted some interesting improvements to
;; man.el from the standard Emacs 18.57 distribution.  I liked many of
;; these, but wanted everything in one single package, so I decided
;; to incorporate them into a single manual browsing mode.  While
;; much of the code here has been rewritten, and some features added,
;; these folks deserve lots of credit for providing the initial
;; excellent packages on which this one is based.

;; Nick Duffek <duffek@chaos.cs.brandeis.edu>, posted a very nice
;; improvement which retrieved and cleaned the manpages in a
;; background process, and which correctly deciphered such options as
;; man -k.

;; Eric Rose <erose@jessica.stanford.edu>, submitted manual.el which
;; provided a very nice manual browsing mode.

;; This package was available as `superman.el' from the LCD package
;; for some time before it was accepted into Emacs 19.  The entry
;; point and some other names have been changed to make it a drop-in
;; replacement for the old man.el package.

;; Francesco Potortì <pot@cnuce.cnr.it> cleaned it up thoroughly,
;; making it faster, more robust and more tolerant of different
;; systems' man idiosyncrasies.

;; ========== Features ==========
;; + Runs "man" in the background and pipes the results through a
;;   series of sed and awk scripts so that all retrieving and cleaning
;;   is done in the background.  The cleaning commands are configurable.
;; + Syntax is the same as Un*x man
;; + Functionality is the same as Un*x man, including "man -k" and
;;   "man <section>", etc.
;; + Provides a manual browsing mode with keybindings for traversing
;;   the sections of a manpage, following references in the SEE ALSO
;;   section, and more.
;; + Multiple manpages created with the same man command are put into
;;   a narrowed buffer circular list.

;; ============= TODO ===========
;; - Add a command for printing.
;; - The awk script deletes multiple blank lines.  This behavior does
;;   not allow one to understand if there was indeed a blank line at the
;;   end or beginning of a page (after the header, or before the
;;   footer).  A different algorithm should be used.  It is easy to
;;   compute how many blank lines there are before and after the page
;;   headers, and after the page footer.  But it is possible to compute
;;   the number of blank lines before the page footer by heuristics
;;   only.  Is it worth doing?
;; - Allow a user option to mean that all the manpages should go in
;;   the same buffer, where they can be browsed with M-n and M-p.

\f
;;; Code:

(require 'ansi-color)
(require 'cl-lib)
(require 'button)

(defgroup man nil
  "Browse UNIX manual pages."
  :prefix "Man-"
  :group 'external
  :group 'help)

(defvar Man-notify)

(defcustom Man-filter-list nil
  "Manpage cleaning filter command phrases.
This variable contains a list of the following form:

  ((command-string phrase-string*)*)

Each phrase-string is concatenated onto the command-string to form a
command filter.  The (standard) output (and standard error) of the Un*x
man command is piped through each command filter in the order the
commands appear in the association list.  The final output is placed in
the manpage buffer."
  :type '(repeat (list (string :tag "Command String")
		       (repeat :inline t
			       (string :tag "Phrase String"))))
  :group 'man)

(defvar Man-uses-untabify-flag t
  "Non-nil means use `untabify' instead of `Man-untabify-command'.")
(defvar Man-sed-script nil
  "Script for sed to nuke backspaces and ANSI codes from manpages.")

(defcustom Man-fontify-manpage-flag t
  "Non-nil means make up the manpage with fonts."
  :type 'boolean
  :group 'man)

(defface Man-overstrike
  '((t (:inherit bold)))
  "Face to use when fontifying overstrike."
  :group 'man
  :version "24.3")

(defface Man-underline
  '((t (:inherit underline)))
  "Face to use when fontifying underlining."
  :group 'man
  :version "24.3")

(defface Man-reverse
  '((t (:inherit highlight)))
  "Face to use when fontifying reverse video."
  :group 'man
  :version "24.3")

(defvar Man-ansi-color-map (let ((ansi-color-faces-vector
				  [ default Man-overstrike default Man-underline
				    Man-underline default default Man-reverse ]))
			     (ansi-color-make-color-map))
  "The value used here for `ansi-color-map'.")

;; Use the value of the obsolete user option Man-notify, if set.
(defcustom Man-notify-method (if (boundp 'Man-notify) Man-notify 'friendly)
  "Selects the behavior when manpage is ready.
This variable may have one of the following values, where (sf) means
that the frames are switched, so the manpage is displayed in the frame
where the man command was called from:

newframe   -- put the manpage in its own frame (see `Man-frame-parameters')
pushy      -- make the manpage the current buffer in the current window
bully      -- make the manpage the current buffer and only window (sf)
aggressive -- make the manpage the current buffer in the other window (sf)
friendly   -- display manpage in the other window but don't make current (sf)
polite     -- don't display manpage, but prints message and beep when ready
quiet      -- like `polite', but don't beep
meek       -- make no indication that the manpage is ready

Any other value of `Man-notify-method' is equivalent to `meek'."
  :type '(radio (const newframe) (const pushy) (const bully)
		(const aggressive) (const friendly)
		(const polite) (const quiet) (const meek))
  :group 'man)

(defcustom Man-width nil
  "Number of columns for which manual pages should be formatted.
If nil, use the width of the window where the manpage is displayed.
If non-nil, use the width of the frame where the manpage is displayed.
The value also can be a positive integer for a fixed width."
  :type '(choice (const :tag "Window width" nil)
                 (const :tag "Frame width" t)
                 (integer :tag "Fixed width" :value 65))
  :group 'man)

(defcustom Man-width-max 80
  "Maximum number of columns allowed for the width of manual pages.
It defines the maximum width for the case when `Man-width' is customized
to a dynamically calculated value depending on the frame/window width.
If the width calculated for `Man-width' is larger than the maximum width,
it will be automatically reduced to the width defined by this variable.
When nil, there is no limit on maximum width."
  :type '(choice (const :tag "No limit" nil)
                 (integer :tag "Max width" :value 80))
  :version "27.1"
  :group 'man)

(defcustom Man-frame-parameters nil
  "Frame parameter list for creating a new frame for a manual page."
  :type '(repeat (cons :format "%v"
		       (symbol :tag "Parameter")
		       (sexp :tag "Value")))
  :group 'man)

(defcustom Man-downcase-section-letters-flag t
  "Non-nil means letters in sections are converted to lower case.
Some Un*x man commands can't handle uppercase letters in sections, for
example \"man 2V chmod\", but they are often displayed in the manpage
with the upper case letter.  When this variable is t, the section
letter (e.g., \"2V\") is converted to lowercase (e.g., \"2v\") before
being sent to the man background process."
  :type 'boolean
  :group 'man)

(defcustom Man-circular-pages-flag t
  "Non-nil means the manpage list is treated as circular for traversal."
  :type 'boolean
  :group 'man)

(defcustom Man-section-translations-alist
  (list
   '("3C++" . "3")
   ;; Some systems have a real 3x man section, so let's comment this.
   ;; '("3X" . "3")                        ; Xlib man pages
   '("3X11" . "3")
   '("1-UCB" . ""))
  "Association list of bogus sections to real section numbers.
Some manpages (e.g. the Sun C++ 2.1 manpages) have section numbers in
their references which Un*x `man' does not recognize.  This
association list is used to translate those sections, when found, to
the associated section number."
  :type '(repeat (cons (string :tag "Bogus Section")
		       (string :tag "Real Section")))
  :group 'man)

;; FIXME see comments at ffap-c-path.
(defcustom Man-header-file-path
  (let ((arch (with-temp-buffer
                (when (eq 0 (ignore-errors
                              (call-process "gcc" nil '(t nil) nil
                                            "-print-multiarch")))
                  (goto-char (point-min))
                  (buffer-substring (point) (line-end-position)))))
        (base '("/usr/include" "/usr/local/include")))
    (if (zerop (length arch))
        base
      (append base (list (expand-file-name arch "/usr/include")))))
  "C Header file search path used in Man."
  :version "24.1"                       ; add multiarch
  :type '(repeat string)
  :group 'man)

(defcustom Man-name-local-regexp (concat "^" (regexp-opt '("NOM" "NAME")) "$")
  "Regexp that matches the text that precedes the command's name.
Used in `bookmark-set' to get the default bookmark name."
  :version "24.1"
  :type 'regexp :group 'bookmark)

(defcustom manual-program "man"
  "Program used by `man' to produce man pages."
  :type 'string
  :group 'man)

(defcustom Man-untabify-command "pr"
  "Program used by `man' for untabifying."
  :type 'string
  :group 'man)

(defcustom Man-untabify-command-args (list "-t" "-e")
  "List of arguments to be passed to `Man-untabify-command' (which see)."
  :type '(repeat string)
  :group 'man)

(defcustom Man-sed-command "sed"
  "Program used by `man' to process sed scripts."
  :type 'string
  :group 'man)

(defcustom Man-awk-command "awk"
  "Program used by `man' to process awk scripts."
  :type 'string
  :group 'man)

;; This is for people who have UTF-8 encoded man pages in non-UTF-8
;; locales, or who use Cygwin 'man' command from a native MS-Windows
;; build of Emacs.
(defcustom Man-coding-system nil
  "Coding-system to decode output from the commands run by `man'.
If this is nil, `man' will use `locale-coding-system'."
  :type 'coding-system
  :group 'man
  :version "26.1")

(defcustom Man-mode-hook nil
  "Hook run when Man mode is enabled."
  :type 'hook
  :group 'man)

(defcustom Man-cooked-hook nil
  "Hook run after removing backspaces but before `Man-mode' processing."
  :type 'hook
  :group 'man)

(defvar Man-name-regexp "[-[:alnum:]_­+][-[:alnum:]_.:­+]*"
  "Regular expression describing the name of a manpage (without section).")

(defvar Man-section-regexp "[0-9][a-zA-Z0-9+]*\\|[LNln]"
  "Regular expression describing a manpage section within parentheses.")

(defvar Man-page-header-regexp
  (if (string-match "-solaris2\\." system-configuration)
      (concat "^[-[:alnum:]_].*[ \t]\\(" Man-name-regexp
	      "(\\(" Man-section-regexp "\\))\\)$")
    (concat "^[ \t]*\\(" Man-name-regexp
	    "(\\(" Man-section-regexp "\\))\\).*\\1"))
  "Regular expression describing the heading of a page.")

(defvar Man-heading-regexp "^\\([[:upper:]][[:upper:]0-9 /-]+\\)$"
  "Regular expression describing a manpage heading entry.")

(defvar Man-see-also-regexp "\\(SEE ALSO\\|VOIR AUSSI\\|SIEHE AUCH\\|VÉASE TAMBIÉN\\|VEJA TAMBÉM\\|VEDERE ANCHE\\|ZOBACZ TAKŻE\\|İLGİLİ BELGELER\\|参照\\|参见 SEE ALSO\\|參見 SEE ALSO\\)"
  "Regular expression for SEE ALSO heading (or your equivalent).
This regexp should not start with a `^' character.")

;; This used to have leading space [ \t]*, but was removed because it
;; causes false page splits on an occasional NAME with leading space
;; inside a manpage.  And `Man-heading-regexp' doesn't have [ \t]* anyway.
(defvar Man-first-heading-regexp "^NAME$\\|^[ \t]*No manual entry fo.*$"
  "Regular expression describing first heading on a manpage.
This regular expression should start with a `^' character.")

(defvar Man-reference-regexp
  (concat "\\(" Man-name-regexp
	  "\\(\\([-‐]\n\\)?[ \t]+" Man-name-regexp "\\)*\\)[ \t]*(\\("
	  Man-section-regexp "\\))")
  "Regular expression describing a reference to another manpage.")

(defvar Man-apropos-regexp
  (concat "\\[\\(" Man-name-regexp "\\)\\][ \t]*(\\(" Man-section-regexp "\\))")
  "Regular expression describing a reference to manpages in \"man -k output\".")

(defvar Man-synopsis-regexp "SYNOPSIS"
  "Regular expression for SYNOPSIS heading (or your equivalent).
This regexp should not start with a `^' character.")

(defvar Man-files-regexp "FILES\\>"
  ;; Add \> so as not to match mount(8)'s FILESYSTEM INDEPENDENT MOUNT OPTIONS.
  "Regular expression for FILES heading (or your equivalent).
This regexp should not start with a `^' character.")

(defvar Man-include-regexp "#[ \t]*include[ \t]*"
  "Regular expression describing the #include (directive of cpp).")

(defvar Man-file-name-regexp "[^<>\", \t\n]+"
  "Regular expression describing <> in #include line (directive of cpp).")

(defvar Man-normal-file-prefix-regexp "[/~$]"
  "Regular expression describing a file path appeared in FILES section.")

(defvar Man-header-regexp
  (concat "\\(" Man-include-regexp "\\)"
          "[<\"]"
          "\\(" Man-file-name-regexp "\\)"
          "[>\"]")
  "Regular expression describing references to header files.")

(defvar Man-normal-file-regexp
  (concat Man-normal-file-prefix-regexp Man-file-name-regexp)
  "Regular expression describing references to normal files.")

;; This includes the section as an optional part to catch hyphenated
;; references to manpages.
(defvar Man-hyphenated-reference-regexp
  (concat "\\(" Man-name-regexp "\\)\\((\\(" Man-section-regexp "\\))\\)?")
  "Regular expression describing a reference in the SEE ALSO section.")

(defcustom Man-switches ""
  "Switches passed to the man command, as a single string.
For example, the -a switch lets you see all the manpages for a
specified subject, if your `man' program supports it."
  :type 'string
  :group 'man)

(defvar Man-specified-section-option
  (if (string-match "-solaris[0-9.]*$" system-configuration)
      "-s"
    "")
  "Option that indicates a specified a manual section name.")

(defvar Man-support-local-filenames 'auto-detect
  "Internal cache for the value of the function `Man-support-local-filenames'.
`auto-detect' means the value is not yet determined.
Otherwise, the value is whatever the function
`Man-support-local-filenames' should return.")

(defcustom man-imenu-title "Contents"
  "The title to use if man adds a Contents menu to the menubar."
  :version "24.4"
  :type 'string
  :group 'man)

\f
;; other variables and keymap initializations
(defvar Man-original-frame)
(make-variable-buffer-local 'Man-original-frame)
(defvar Man-arguments)
(make-variable-buffer-local 'Man-arguments)
(put 'Man-arguments 'permanent-local t)

(defvar Man--sections nil)
(make-variable-buffer-local 'Man--sections)
(defvar Man--refpages nil)
(make-variable-buffer-local 'Man--refpages)
(defvar Man-page-list nil)
(make-variable-buffer-local 'Man-page-list)
(defvar Man-current-page 0)
(make-variable-buffer-local 'Man-current-page)
(defvar Man-page-mode-string "1 of 1")
(make-variable-buffer-local 'Man-page-mode-string)

(defconst Man-sysv-sed-script "\
/\b/ {	s/_\b//g
	s/\b_//g
        s/o\b+/o/g
        s/+\bo/o/g
	:ovstrk
	s/\\(.\\)\b\\1/\\1/g
	t ovstrk
	}
/\e\\[[0-9][0-9]*m/ s///g"
  "Script for sysV-like sed to nuke backspaces and ANSI codes from manpages.")

(defconst Man-berkeley-sed-script "\
/\b/ {	s/_\b//g\\
	s/\b_//g\\
        s/o\b+/o/g\\
        s/+\bo/o/g\\
	:ovstrk\\
	s/\\(.\\)\b\\1/\\1/g\\
	t ovstrk\\
	}\\
/\e\\[[0-9][0-9]*m/ s///g"
  "Script for berkeley-like sed to nuke backspaces and ANSI codes from manpages.")

(defvar Man-topic-history nil "Topic read history.")

(defvar Man-mode-syntax-table
  (let ((table (copy-syntax-table (standard-syntax-table))))
    (modify-syntax-entry ?. "w" table)
    (modify-syntax-entry ?_ "w" table)
    (modify-syntax-entry ?: "w" table)	; for PDL::Primitive in Perl man pages
    table)
  "Syntax table used in Man mode buffers.")

(defvar Man-mode-map
  (let ((map (make-sparse-keymap)))
    (suppress-keymap map)
    (set-keymap-parent map
      (make-composed-keymap button-buffer-map special-mode-map))

    (define-key map "n"    'Man-next-section)
    (define-key map "p"    'Man-previous-section)
    (define-key map "\en"  'Man-next-manpage)
    (define-key map "\ep"  'Man-previous-manpage)
    (define-key map "."    'beginning-of-buffer)
    (define-key map "r"    'Man-follow-manual-reference)
    (define-key map "g"    'Man-goto-section)
    (define-key map "s"    'Man-goto-see-also-section)
    (define-key map "k"    'Man-kill)
    (define-key map "u"    'Man-update-manpage)
    (define-key map "m"    'man)
    ;; Not all the man references get buttons currently.  The text in the
    ;; manual page can contain references to other man pages
    (define-key map "\r"   'man-follow)

    (easy-menu-define nil map
      "`Man-mode' menu."
      '("Man"
        ["Next Section" Man-next-section t]
        ["Previous Section" Man-previous-section t]
        ["Go To Section..." Man-goto-section t]
        ["Go To \"SEE ALSO\" Section" Man-goto-see-also-section
         :active (cl-member Man-see-also-regexp Man--sections
                            :test #'string-match-p)]
        ["Follow Reference..." Man-follow-manual-reference
         :active Man--refpages
         :help "Go to a manpage referred to in the \"SEE ALSO\" section"]
        "--"
        ["Next Manpage" Man-next-manpage
         :active (> (length Man-page-list) 1)]
        ["Previous Manpage" Man-previous-manpage
         :active (> (length Man-page-list) 1)]
        "--"
        ["Man..." man t]
        ["Kill Buffer" Man-kill t]
        ["Quit" quit-window t]))
    map)
  "Keymap for Man mode.")

;; buttons
(define-button-type 'Man-abstract-xref-man-page
  'follow-link t
  'help-echo "mouse-2, RET: display this man page"
  'func nil
  'action #'Man-xref-button-action)

(defun Man-xref-button-action (button)
  (let ((target (button-get button 'Man-target-string)))
    (funcall
     (button-get button 'func)
     (cond ((null target)
	    (button-label button))
	   ((functionp target)
	    (funcall target (button-start button)))
	   (t target)))))

(define-button-type 'Man-xref-man-page
  :supertype 'Man-abstract-xref-man-page
  'func 'man-follow)


(define-button-type 'Man-xref-header-file
    'action (lambda (button)
              (let ((w (button-get button 'Man-target-string)))
                (unless (Man-view-header-file w)
                  (error "Cannot find header file: %s" w))))
    'follow-link t
    'help-echo "mouse-2: display this header file")

(define-button-type 'Man-xref-normal-file
  'action (lambda (button)
	    (let ((f (substitute-in-file-name
		      (button-get button 'Man-target-string))))
	      (if (file-exists-p f)
		  (if (file-readable-p f)
		      (view-file f)
		    (error "Cannot read a file: %s" f))
		(error "Cannot find a file: %s" f))))
  'follow-link t
  'help-echo "mouse-2: display this file")

\f
;; ======================================================================
;; utilities

(defun Man-init-defvars ()
  "Used for initializing variables based on display's color support.
This is necessary if one wants to dump man.el with Emacs."

  ;; Avoid possible error in call-process by using a directory that must exist.
  (let ((default-directory "/"))
    (setq Man-sed-script
	  (cond
	   (Man-fontify-manpage-flag
	    nil)
	   ((eq 0 (call-process Man-sed-command nil nil nil Man-sysv-sed-script))
	    Man-sysv-sed-script)
	   ((eq 0 (call-process Man-sed-command nil nil nil Man-berkeley-sed-script))
	    Man-berkeley-sed-script)
	   (t
	    nil))))

  (setq Man-filter-list
	;; Avoid trailing nil which confuses customize.
	(apply 'list
	 (cons
	  Man-sed-command
	  (if (eq system-type 'windows-nt)
	      ;; Windows needs ".." quoting, not '..'.
	      (list
	       "-e \"/Reformatting page.  Wait/d\""
	       "-e \"/Reformatting entry.  Wait/d\""
	       "-e \"/^[ \t][ \t]*-[ \t][0-9]*[ \t]-[ \t]*Formatted:.*[0-9]$/d\""
	       "-e \"/^[ \t]*Page[ \t][0-9]*.*(printed[ \t][0-9\\/]*)$/d\""
	       "-e \"/^Printed[ \t][0-9].*[0-9]$/d\""
	       "-e \"/^[ \t]*X[ \t]Version[ \t]1[01].*Release[ \t][0-9]/d\""
	       "-e \"/^[A-Za-z].*Last[ \t]change:/d\""
	       "-e \"/[ \t]*Copyright [0-9]* UNIX System Laboratories, Inc.$/d\""
	       "-e \"/^[ \t]*Rev\\..*Page [0-9][0-9]*$/d\"")
	    (list
	     (if Man-sed-script
		 (concat "-e '" Man-sed-script "'")
	       "")
	     "-e '/^[\001-\032][\001-\032]*$/d'"
	     "-e '/\e[789]/s///g'"
	     "-e '/Reformatting page.  Wait/d'"
	     "-e '/Reformatting entry.  Wait/d'"
	     "-e '/^[ \t]*Hewlett-Packard[ \t]Company[ \t]*-[ \t][0-9]*[ \t]-/d'"
	     "-e '/^[ \t]*Hewlett-Packard[ \t]*-[ \t][0-9]*[ \t]-.*$/d'"
	     "-e '/^[ \t][ \t]*-[ \t][0-9]*[ \t]-[ \t]*Formatted:.*[0-9]$/d'"
	     "-e '/^[ \t]*Page[ \t][0-9]*.*(printed[ \t][0-9\\/]*)$/d'"
	     "-e '/^Printed[ \t][0-9].*[0-9]$/d'"
	     "-e '/^[ \t]*X[ \t]Version[ \t]1[01].*Release[ \t][0-9]/d'"
	     "-e '/^[A-Za-z].*Last[ \t]change:/d'"
	     "-e '/^Sun[ \t]Release[ \t][0-9].*[0-9]$/d'"
	     "-e '/[ \t]*Copyright [0-9]* UNIX System Laboratories, Inc.$/d'"
	     "-e '/^[ \t]*Rev\\..*Page [0-9][0-9]*$/d'"
	     )))
	 ;; Windows doesn't support multi-line commands, so don't
	 ;; invoke Awk there.
	 (unless (eq system-type 'windows-nt)
	   (cons
	    Man-awk-command
	    (list
	     "'\n"
	     "BEGIN { blankline=0; anonblank=0; }\n"
	     "/^$/ { if (anonblank==0) next; }\n"
	     "{ anonblank=1; }\n"
	     "/^$/ { blankline++; next; }\n"
	     "{ if (blankline>0) { print \"\"; blankline=0; } print $0; }\n"
	     "'"
	     )))
	 (if (not Man-uses-untabify-flag)
	     ;; The outer list will be stripped off by apply.
	     (list (cons
		    Man-untabify-command
		    Man-untabify-command-args))
	   )))
)

(defsubst Man-make-page-mode-string ()
  "Formats part of the mode line for Man mode."
  (format "%s page %d of %d"
	  (or (nth 2 (nth (1- Man-current-page) Man-page-list))
	      "")
	  Man-current-page
	  (length Man-page-list)))

(defsubst Man-build-man-command ()
  "Builds the entire background manpage and cleaning command."
  (let ((command (concat manual-program " " Man-switches
                         (cond
                          ;; Already has %s
                          ((string-match "%s" manual-program) "")
                          ;; Stock MS-DOS shells cannot redirect stderr;
                          ;; `call-process' below sends it to /dev/null,
                          ;; so we don't need `2>' even with DOS shells
                          ;; which do support stderr redirection.
                          ((not (fboundp 'make-process)) " %s")
                          ((concat " %s 2>" null-device
                                   ;; Some MS-Windows ports of Groff
                                   ;; try to read stdin after exhausting
                                   ;; the command-line arguments; make
                                   ;; them exit if/when they do.
                                   (if (eq system-type 'windows-nt)
                                       (concat " <" null-device)))))))
	(flist Man-filter-list))
    (while (and flist (car flist))
      (let ((pcom (car (car flist)))
	    (pargs (cdr (car flist))))
	(setq command
	      (concat command " | " pcom " "
		      (mapconcat (lambda (phrase)
				   (if (not (stringp phrase))
				       (error "Malformed Man-filter-list"))
				   phrase)
				 pargs " ")))
        (setq flist (cdr flist))))
    command))


(defun Man-translate-cleanup (string)
  "Strip leading, trailing and middle spaces."
  (when (stringp string)
    ;;  Strip leading and trailing
    (if (string-match "^[ \t\f\r\n]*\\(.+[^ \t\f\r\n]\\)" string)
        (setq string (match-string 1 string)))
    ;; middle spaces
    (setq string (replace-regexp-in-string "[\t\r\n]" " " string))
    (setq string (replace-regexp-in-string "  +" " " string))
    string))

(defun Man-translate-references (ref)
  "Translates REF from \"chmod(2V)\" to \"2v chmod\" style.
Leave it as is if already in that style.  Possibly downcase and
translate the section (see the `Man-downcase-section-letters-flag'
and the `Man-section-translations-alist' variables)."
  (let ((name "")
        (section "")
        (slist Man-section-translations-alist))
    (setq ref (Man-translate-cleanup ref))
    (cond
     ;; "chmod(2V)" case ?
     ((string-match (concat "^" Man-reference-regexp "$") ref)
      (setq name (replace-regexp-in-string "[\n\t ]" "" (match-string 1 ref))
	    section (match-string 4 ref)))
     ;; "2v chmod" case ?
     ((string-match (concat "^\\(" Man-section-regexp
			    "\\) +\\(" Man-name-regexp "\\)$") ref)
      (setq name (match-string 2 ref)
	    section (match-string 1 ref))))
    (if (string= name "")
	ref				; Return the reference as is
      (if Man-downcase-section-letters-flag
	  (setq section (downcase section)))
      (while slist
	(let ((s1 (car (car slist)))
	      (s2 (cdr (car slist))))
	  (setq slist (cdr slist))
	  (if Man-downcase-section-letters-flag
	      (setq s1 (downcase s1)))
	  (if (not (string= s1 section)) nil
	    (setq section (if Man-downcase-section-letters-flag
			      (downcase s2)
			    s2)
		  slist nil))))
      (concat Man-specified-section-option section " " name))))

(defun Man-support-local-filenames ()
  "Return non-nil if the man command supports local filenames.
Different man programs support this feature in different ways.
The default Debian man program (\"man-db\") has a `--local-file'
\(or `-l') option for this purpose.  The default Red Hat man
program has no such option, but interprets any name containing
a \"/\" as a local filename.  The function returns either `man-db'
`man', or nil."
  (if (eq Man-support-local-filenames 'auto-detect)
      (setq Man-support-local-filenames
            (with-temp-buffer
              (let ((default-directory
                      ;; Ensure that `default-directory' exists and is readable.
                      (if (file-accessible-directory-p default-directory)
                          default-directory
                        (expand-file-name "~/"))))
                (ignore-errors
                  (call-process manual-program nil t nil "--help")))
              (cond ((search-backward "--local-file" nil 'move)
                     'man-db)
                    ;; This feature seems to be present in at least ver 1.4f,
                    ;; which is about 20 years old.
                    ;; I don't know if this version has an official name?
                    ((looking-at "^man, versione? [1-9]")
                     'man))))
    Man-support-local-filenames))

\f
;; ======================================================================
;; default man entry: get word near point

(defun Man-default-man-entry (&optional pos)
  "Guess default manual entry based on the text near position POS.
POS defaults to `point'."
  (let (word start column distance)
    (save-excursion
      (when pos (goto-char pos))
      (setq pos (point))
      ;; The default title is the nearest entry-like object before or
      ;; after POS.
      (if (and (skip-chars-backward " \ta-zA-Z0-9+")
	       (not (zerop (skip-chars-backward "(")))
	       ;; Try to handle the special case where POS is on a
	       ;; section number.
	       (looking-at
		(concat "([ \t]*\\(" Man-section-regexp "\\)[ \t]*)"))
	       ;; We skipped a valid section number backwards, look at
	       ;; preceding text.
	       (or (and (skip-chars-backward ",; \t")
			(not (zerop (skip-chars-backward "-a-zA-Z0-9._+:"))))
		   ;; Not a valid entry, move POS after closing paren.
		   (not (setq pos (match-end 0)))))
	  ;; We have a candidate, make `start' record its starting
	  ;; position.
	  (setq start (point))
	;; Otherwise look at char before POS.
	(goto-char pos)
	(if (not (zerop (skip-chars-backward "-a-zA-Z0-9._+:")))
	    ;; Our candidate is just before or around POS.
	    (setq start (point))
	  ;; Otherwise record the current column and look backwards.
	  (setq column (current-column))
	  (skip-chars-backward ",; \t")
	  ;; Record the distance traveled.
	  (setq distance (- column (current-column)))
	  (when (looking-back
		 (concat "([ \t]*\\(?:" Man-section-regexp "\\)[ \t]*)")
                 (line-beginning-position))
	    ;; Skip section number backwards.
	    (goto-char (match-beginning 0))
	    (skip-chars-backward " \t"))
	  (if (not (zerop (skip-chars-backward "-a-zA-Z0-9._+:")))
	      (progn
		;; We have a candidate before POS ...
		(setq start (point))
		(goto-char pos)
		(if (and (skip-chars-forward ",; \t")
			 (< (- (current-column) column) distance)
			 (looking-at "[-a-zA-Z0-9._+:]"))
		    ;; ... but the one after POS is better.
		    (setq start (point))
		  ;; ... and anything after POS is worse.
		  (goto-char start)))
	    ;; No candidate before POS.
	    (goto-char pos)
	    (skip-chars-forward ",; \t")
	    (setq start (point)))))
      ;; We have found a suitable starting point, try to skip at least
      ;; one character.
      (skip-chars-forward "-a-zA-Z0-9._+:")
      (setq word (buffer-substring-no-properties start (point)))
      ;; If there is a continuation at the end of line, check the
      ;; following line too, eg:
      ;;     see this-
      ;;     command-here(1)
      ;; Note: This code gets executed iff our entry is after POS.
      (when (looking-at
             (concat
              "‐?[ \t\r\n]+\\([-a-zA-Z0-9._+:]+\\)(" Man-section-regexp ")"))
        (let ((1st-part word))
          (setq word (concat word (match-string-no-properties 1)))
          ;; If they use -Tascii, we cannot know whether a hyphen at
          ;; EOL is or isn't part of the referenced manpage name.
          ;; Heuristics: if the part of the manpage before the hyphen
          ;; doesn't include a hyphen, we consider the hyphen to be
          ;; added by troff, and remove it.
          (or (not (eq (string-to-char (substring 1st-part -1)) ?-))
              (string-match-p "-" (substring 1st-part 0 -1))
              (setq word (replace-regexp-in-string "-" "" word))))
	;; Make sure the section number gets included by the code below.
	(goto-char (match-end 1)))
      (when (string-match "[-._‐]+$" word)
	(setq word (substring word 0 (match-beginning 0))))
      ;; The following was commented out since the preceding code
      ;; should not produce a leading "*" in the first place.
;;;       ;; If looking at something like *strcat(... , remove the '*'
;;;       (when (string-match "^*" word)
;;; 	(setq word (substring word 1)))
	(concat
	 word
	 (and (not (string-equal word ""))
	      ;; If looking at something like ioctl(2) or brc(1M),
	      ;; include the section number in the returned value.
	      (looking-at
	       (concat "[ \t]*([ \t]*\\(" Man-section-regexp "\\)[ \t]*)"))
	      (format "(%s)" (match-string-no-properties 1)))))))

\f
;; ======================================================================
;; Top level command and background process sentinel

;; For compatibility with older versions.
;;;###autoload
(defalias 'manual-entry 'man)

(defvar Man-completion-cache nil
  ;; On my machine, "man -k" is so fast that a cache makes no sense,
  ;; but apparently that's not the case in all cases, so let's add a cache.
  "Cache of completion table of the form (PREFIX . TABLE).")

(defvar Man-man-k-use-anchor
  ;; man-db or man-1.*
  (memq system-type '(gnu gnu/linux gnu/kfreebsd))
  "If non-nil prepend ^ to the prefix passed to \"man -k\" for completion.
The value should be nil if \"man -k ^PREFIX\" may omit some man
pages whose names start with PREFIX.

Currently, the default value depends on `system-type' and is
non-nil where the standard man programs are known to behave
properly.  Setting the value to nil always gives correct results
but computing the list of completions may take a bit longer.")

(defun Man-parse-man-k ()
  "Parse \"man -k\" output and return the list of page names.

The current buffer should contain the output of a command of the
form \"man -k keyword\", which is traditionally also available with
apropos(1).

While POSIX man(1p) is a bit vague about what to expect here,
this function tries to parse some commonly used formats, which
can be described in the following informal way, with square brackets
indicating optional parts and whitespace being interpreted
somewhat loosely.

foo[, bar [, ...]] [other stuff] (sec) - description
foo(sec)[, bar(sec) [, ...]] [other stuff] - description"
  (goto-char (point-min))
  ;; See man-tests for data about which systems use which format (hopefully we
  ;; will be able to simplify the code if/when some of those formats aren't
  ;; used any more).
  (let (table)
    (while (search-forward-regexp "^\\([^ \t,\n]+\\)\\(.*?\\)\
\\(?:[ \t]\\(([^ \t,\n]+?)\\)\\)?\\(?:[ \t]+- ?\\(.*\\)\\)?$" nil t)
      (let ((section (match-string 3))
	    (description (match-string 4))
	    (bound (match-end 2)))
        (goto-char (match-end 1))
	(while
            (progn
              ;; The first regexp grouping may already match the section
              ;; tacked on to the name, which is ok since for the formats we
              ;; claim to support the third (non-shy) grouping does not
              ;; match in this case, i.e., section is nil.
              (push (propertize (concat (match-string 1) section)
                                'help-echo description)
                    table)
              (search-forward-regexp "\\=, *\\([^ \t,]+\\)" bound t)))))
    (nreverse table)))

(defun Man-completion-table (string pred action)
  (cond
   ;; This ends up returning t for pretty much any string, and hence leads to
   ;; spurious "complete but not unique" messages.  And since `man' doesn't
   ;; require-match anyway, there's not point being clever.
   ;;((eq action 'lambda) (not (string-match "([^)]*\\'" string)))
   ((equal string "-k")
    ;; Let SPC (minibuffer-complete-word) insert the space.
    (complete-with-action action '("-k ") string pred))
   (t
    (let ((table (cdr Man-completion-cache))
          (section nil)
          (prefix string))
      (when (string-match "\\`\\([[:digit:]].*?\\) " string)
        (setq section (match-string 1 string))
        (setq prefix (substring string (match-end 0))))
      (unless (and Man-completion-cache
                   (string-prefix-p (car Man-completion-cache) prefix))
        (with-temp-buffer
          (setq default-directory "/") ;; in case inherited doesn't exist
          ;; Actually for my `man' the arg is a regexp.
          ;; POSIX says it must be ERE and "man-db" seems to agree,
          ;; whereas under macOS it seems to be BRE-style and doesn't
          ;; accept backslashes at all.  Let's not bother to
          ;; quote anything.
          (let ((process-environment (copy-sequence process-environment)))
            (setenv "COLUMNS" "999") ;; don't truncate long names
            ;; manual-program might not even exist.  And since it's
            ;; run differently in Man-getpage-in-background, an error
            ;; here may not necessarily mean that we'll also get an
            ;; error later.
	    (ignore-errors
	      (call-process manual-program nil '(t nil) nil
			    "-k" (concat (when (or Man-man-k-use-anchor
						   (string-equal prefix ""))
					   "^")
					 prefix))))
	  (setq table (Man-parse-man-k)))
	;; Cache the table for later reuse.
	(setq Man-completion-cache (cons prefix table)))
      ;; The table may contain false positives since the match is made
      ;; by "man -k" not just on the manpage's name.
      (if section
          (let ((re (concat "(" (regexp-quote section) ")\\'")))
            (dolist (comp (prog1 table (setq table nil)))
              (if (string-match re comp)
                  (push (substring comp 0 (match-beginning 0)) table)))
            (completion-table-with-context (concat section " ") table
                                           prefix pred action))
        ;; If the current text looks like a possible section name,
        ;; then add a completion entry that just adds a space so SPC
        ;; can be used to insert a space.
        (if (string-match "\\`[[:digit:]]" string)
            (push (concat string " ") table))
        (let ((res (complete-with-action action table string pred)))
          ;; In case we're completing to a single name that exists in
          ;; several sections, the longest prefix will look like "foo(".
          (if (and (stringp res)
                   (string-match "([^(]*\\'" res)
                   ;; In case the paren was already in `prefix', don't
                   ;; remove it.
                   (> (match-beginning 0) (length prefix)))
              (substring res 0 (match-beginning 0))
            res)))))))

;;;###autoload
(defun man (man-args)
  "Get a Un*x manual page and put it in a buffer.
This command is the top-level command in the man package.
It runs a Un*x command to retrieve and clean a manpage in the
background and places the results in a `Man-mode' browsing
buffer.  The variable `Man-width' defines the number of columns in
formatted manual pages.  The buffer is displayed immediately.
The variable `Man-notify-method' defines how the buffer is displayed.
If a buffer already exists for this man page, it will be displayed
without running the man command.

For a manpage from a particular section, use either of the
following.  \"cat(1)\" is how cross-references appear and is
passed to man as \"1 cat\".

    cat(1)
    1 cat

To see manpages from all sections related to a subject, use an
\"all pages\" option (which might be \"-a\" if it's not the
default), then step through with `Man-next-manpage' (\\<Man-mode-map>\\[Man-next-manpage]) etc.
Add to `Man-switches' to make this option permanent.

    -a chmod

An explicit filename can be given too.  Use -l if it might
otherwise look like a page name.

    /my/file/name.1.gz
    -l somefile.1

An \"apropos\" query with -k gives a buffer of matching page
names or descriptions.  The pattern argument is usually an
\"grep -E\" style regexp.

    -k pattern"

  (interactive
   (list (let* ((default-entry (Man-default-man-entry))
		;; ignore case because that's friendly for bizarre
		;; caps things like the X11 function names and because
		;; "man" itself is case-insensitive on the command line
		;; so you're accustomed not to bother about the case
		;; ("man -k" is case-insensitive similarly, so the
		;; table has everything available to complete)
		(completion-ignore-case t)
		Man-completion-cache    ;Don't cache across calls.
		(input (completing-read
			(format "Manual entry%s"
				(if (string= default-entry "")
				    ": "
				  (format " (default %s): " default-entry)))
                        'Man-completion-table
			nil nil nil 'Man-topic-history default-entry)))
	   (if (string= input "")
	       (error "No man args given")
	     input))))

  ;; Possibly translate the "subject(section)" syntax into the
  ;; "section subject" syntax and possibly downcase the section.
  (setq man-args (Man-translate-references man-args))

  (Man-getpage-in-background man-args))

;;;###autoload
(defun man-follow (man-args)
  "Get a Un*x manual page of the item under point and put it in a buffer."
  (interactive (list (Man-default-man-entry)))
  (if (or (not man-args)
	  (string= man-args ""))
      (error "No item under point")
    (man man-args)))

(defvar Man-columns nil)

(defun Man-columns ()
  (let ((width (cond
                ((and (integerp Man-width) (> Man-width 0))
                 Man-width)
                (Man-width
                 (let ((window (get-buffer-window nil t)))
                   (frame-width (and window (window-frame window)))))
                (t
                 (window-width (get-buffer-window nil t))))))
    (when (and (integerp Man-width-max)
               (> Man-width-max 0))
      (setq width (min width Man-width-max)))
    width))

(defmacro Man-start-calling (&rest body)
  "Start the man command in `body' after setting up the environment."
  `(let ((process-environment (copy-sequence process-environment))
	;; The following is so Awk script gets \n intact
	;; But don't prevent decoding of the outside.
	(coding-system-for-write 'raw-text-unix)
	;; We must decode the output by a coding system that the
	;; system's locale suggests in multibyte mode.
	(coding-system-for-read
         (or coding-system-for-read  ; allow overriding with "C-x RET c"
             Man-coding-system
             locale-coding-system))
	;; Avoid possible error by using a directory that always exists.
	(default-directory
	  (if (and (file-directory-p default-directory)
		   (not (find-file-name-handler default-directory
						'file-directory-p)))
	      default-directory
	    "/")))
    ;; Prevent any attempt to use display terminal fanciness.
    (setenv "TERM" "dumb")
    ;; In Debian Woody, at least, we get overlong lines under X
    ;; unless COLUMNS or MANWIDTH is set.  This isn't a problem on
    ;; a tty.  man(1) says:
    ;;        MANWIDTH
    ;;               If $MANWIDTH is set, its value is used as the  line
    ;;               length  for which manual pages should be formatted.
    ;;               If it is not set, manual pages  will  be  formatted
    ;;               with  a line length appropriate to the current ter-
    ;;               minal (using an ioctl(2) if available, the value of
    ;;               $COLUMNS,  or falling back to 80 characters if nei-
    ;;               ther is available).
    (when (or window-system
	      (not (or (getenv "MANWIDTH") (getenv "COLUMNS"))))
      ;; Since the page buffer is displayed beforehand,
      ;; we can select its window and get the window/frame width.
      (setq-local Man-columns (Man-columns))
      (setenv "COLUMNS" (number-to-string Man-columns)))
    ;; Since man-db 2.4.3-1, man writes plain text with no escape
    ;; sequences when stdout is not a tty.	In 2.5.0, the following
    ;; env-var was added to allow control of this (see Debian Bug#340673).
    (setenv "MAN_KEEP_FORMATTING" "1")
    ,@body))

(defun Man-getpage-in-background (topic)
  "Use TOPIC to build and fire off the manpage and cleaning command.
Return the buffer in which the manpage will appear."
  (let* ((man-args topic)
	 (bufname (concat "*Man " man-args "*"))
	 (buffer  (get-buffer bufname)))
    (if buffer
	(Man-notify-when-ready buffer)
      (require 'env)
      (message "Invoking %s %s in the background" manual-program man-args)
      (setq buffer (generate-new-buffer bufname))
      (with-current-buffer buffer
	(Man-notify-when-ready buffer)
	(setq buffer-undo-list t)
	(setq Man-original-frame (selected-frame))
	(setq Man-arguments man-args)
	(Man-mode)
	(setq mode-line-process
	      (concat " " (propertize (if Man-fontify-manpage-flag
					  "[formatting...]"
					"[cleaning...]")
				      'face 'mode-line-emphasis)))
	(Man-start-calling
	 (if (fboundp 'make-process)
	     (let ((proc (start-process
			  manual-program buffer
			  (if (memq system-type '(cygwin windows-nt))
			      shell-file-name
			    "sh")
			  shell-command-switch
			  (format (Man-build-man-command) man-args))))
	       (set-process-sentinel proc 'Man-bgproc-sentinel)
	       (set-process-filter proc 'Man-bgproc-filter))
	   (let* ((inhibit-read-only t)
		  (exit-status
		   (call-process shell-file-name nil (list buffer nil) nil
				 shell-command-switch
				 (format (Man-build-man-command) man-args)))
		  (msg ""))
	     (or (and (numberp exit-status)
		      (= exit-status 0))
		 (and (numberp exit-status)
		      (setq msg
			    (format "exited abnormally with code %d"
				    exit-status)))
		 (setq msg exit-status))
	     (if Man-fontify-manpage-flag
		 (Man-fontify-manpage)
	       (Man-cleanup-manpage))
	     (Man-bgproc-sentinel bufname msg))))))
    buffer))

(defun Man-update-manpage ()
  "Reformat current manpage by calling the man command again synchronously."
  (interactive)
  (when (eq Man-arguments nil)
    ;;this shouldn't happen unless it is not in a Man buffer."
    (error "Man-arguments not initialized"))
  (let ((old-pos (point))
	(text (current-word))
	(old-size (buffer-size))
	(inhibit-read-only t)
	(buffer-read-only nil))
     (erase-buffer)
     (Man-start-calling
      (call-process shell-file-name nil (list (current-buffer) nil) nil
		    shell-command-switch
		    (format (Man-build-man-command) Man-arguments)))
     (if Man-fontify-manpage-flag
	 (Man-fontify-manpage)
       (Man-cleanup-manpage))
     (goto-char old-pos)
     ;;restore the point, not strictly right.
     (unless (or (eq text nil) (= old-size (buffer-size)))
       (let ((case-fold-search nil))
	 (if (> old-size (buffer-size))
	     (search-backward text nil t))
	 (search-forward text nil t)))))

(defvar Man--window-state-change-timer nil)

(defun Man--window-state-change (window)
  (unless (integerp Man-width)
    (when (timerp Man--window-state-change-timer)
      (cancel-timer Man--window-state-change-timer))
    (setq Man--window-state-change-timer
          (run-with-idle-timer 1 nil #'Man-fit-to-window window))))

(defun Man-fit-to-window (window)
  "Adjust width of the buffer to fit columns into WINDOW boundaries."
  (when (window-live-p window)
    (with-current-buffer (window-buffer window)
      (when (and (derived-mode-p 'Man-mode)
                 (not (eq Man-columns (Man-columns))))
        (let ((proc (get-buffer-process (current-buffer))))
          (unless (and proc (not (eq (process-status proc) 'exit)))
            (Man-update-manpage)))))))

(defun Man-notify-when-ready (man-buffer)
  "Notify the user when MAN-BUFFER is ready.
See the variable `Man-notify-method' for the different notification behaviors."
  (let ((saved-frame (with-current-buffer man-buffer
		       Man-original-frame)))
    (pcase Man-notify-method
      ('newframe
       ;; Since we run asynchronously, perhaps while Emacs is waiting
       ;; for input, we must not leave a different buffer current.  We
       ;; can't rely on the editor command loop to reselect the
       ;; selected window's buffer.
       (save-excursion
         (let ((frame (make-frame Man-frame-parameters)))
           (set-window-buffer (frame-selected-window frame) man-buffer)
           (set-window-dedicated-p (frame-selected-window frame) t)
           (or (display-multi-frame-p frame)
               (select-frame frame)))))
      ('pushy
       (switch-to-buffer man-buffer))
      ('bully
       (and (frame-live-p saved-frame)
            (select-frame saved-frame))
       (pop-to-buffer man-buffer)
       (delete-other-windows))
      ('aggressive
       (and (frame-live-p saved-frame)
            (select-frame saved-frame))
       (pop-to-buffer man-buffer))
      ('friendly
       (and (frame-live-p saved-frame)
            (select-frame saved-frame))
       (display-buffer man-buffer 'not-this-window))
      ('polite
       (beep)
       (message "Manual buffer %s is ready" (buffer-name man-buffer)))
      ('quiet
       (message "Manual buffer %s is ready" (buffer-name man-buffer)))
      (_ ;; meek
       (message ""))
      )))

(defun Man-softhyphen-to-minus ()
  ;; \255 is SOFT HYPHEN in Latin-N.  Versions of Debian man, at
  ;; least, emit it even when not in a Latin-N locale.
  (unless (eq t (compare-strings "latin-" 0 nil
				 current-language-environment 0 6 t))
    (goto-char (point-min))
    (while (search-forward "­" nil t) (replace-match "-"))))

(defun Man-fontify-manpage ()
  "Convert overstriking and underlining to the correct fonts.
Same for the ANSI bold and normal escape sequences."
  (interactive)
  (goto-char (point-min))
  ;; Fontify ANSI escapes.
  (let ((ansi-color-apply-face-function #'ansi-color-apply-text-property-face)
	(ansi-color-map Man-ansi-color-map))
    (ansi-color-apply-on-region (point-min) (point-max)))
  ;; Other highlighting.
  (let ((buffer-undo-list t))
    (if (< (buffer-size) (position-bytes (point-max)))
	;; Multibyte characters exist.
	(progn
	  (goto-char (point-min))
	  (while (and (search-forward "__\b\b" nil t) (not (eobp)))
	    (backward-delete-char 4)
            (put-text-property (point) (1+ (point))
                               'font-lock-face 'Man-underline))
	  (goto-char (point-min))
	  (while (search-forward "\b\b__" nil t)
	    (backward-delete-char 4)
            (put-text-property (1- (point)) (point)
                               'font-lock-face 'Man-underline))))
    (goto-char (point-min))
    (while (and (search-forward "_\b" nil t) (not (eobp)))
      (backward-delete-char 2)
      (put-text-property (point) (1+ (point)) 'font-lock-face 'Man-underline))
    (goto-char (point-min))
    (while (search-forward "\b_" nil t)
      (backward-delete-char 2)
      (put-text-property (1- (point)) (point) 'font-lock-face 'Man-underline))
    (goto-char (point-min))
    (while (re-search-forward "\\(.\\)\\(\b+\\1\\)+" nil t)
      (replace-match "\\1")
      (put-text-property (1- (point)) (point) 'font-lock-face 'Man-overstrike))
    (goto-char (point-min))
    (while (re-search-forward "o\b\\+\\|\\+\bo" nil t)
      (replace-match "o")
      (put-text-property (1- (point)) (point) 'font-lock-face 'bold))
    (goto-char (point-min))
    (while (re-search-forward "[-|]\\(\b[-|]\\)+" nil t)
      (replace-match "+")
      (put-text-property (1- (point)) (point) 'font-lock-face 'bold))
    ;; When the header is longer than the manpage name, groff tries to
    ;; condense it to a shorter line interspersed with ^H.  Remove ^H with
    ;; their preceding chars (but don't put Man-overstrike).  (Bug#5566)
    (goto-char (point-min))
    (while (re-search-forward ".\b" nil t) (backward-delete-char 2))
    (goto-char (point-min))
    ;; Try to recognize common forms of cross references.
    (Man-highlight-references)
    (Man-softhyphen-to-minus)
    (goto-char (point-min))
    (while (re-search-forward Man-heading-regexp nil t)
      (put-text-property (match-beginning 0)
			 (match-end 0)
			 'font-lock-face 'Man-overstrike))))

(defun Man-highlight-references (&optional xref-man-type)
  "Highlight the references on mouse-over.
References include items in the SEE ALSO section,
header file (#include <foo.h>), and files in FILES.
If optional argument XREF-MAN-TYPE is non-nil, it used as the
button type for items in SEE ALSO section.  If it is nil, the
default type, `Man-xref-man-page' is used for the buttons."
  ;; `Man-highlight-references' is used from woman.el, too.
  ;; woman.el doesn't set `Man-arguments'.
  (unless Man-arguments
    (setq Man-arguments ""))
  (if (string-match "-k " Man-arguments)
      (progn
	(Man-highlight-references0 nil Man-reference-regexp 1
				   'Man-default-man-entry
				   (or xref-man-type 'Man-xref-man-page))
	(Man-highlight-references0 nil Man-apropos-regexp 1
				   'Man-default-man-entry
				   (or xref-man-type 'Man-xref-man-page)))
    (Man-highlight-references0 Man-see-also-regexp Man-reference-regexp 1
			       'Man-default-man-entry
			       (or xref-man-type 'Man-xref-man-page))
    (Man-highlight-references0 Man-synopsis-regexp Man-header-regexp 0 2
			       'Man-xref-header-file)
    (Man-highlight-references0 Man-files-regexp Man-normal-file-regexp 0 0
			       'Man-xref-normal-file)))

(defun Man-highlight-references0 (start-section regexp button-pos target type)
  ;; Based on `Man-build-references-alist'
  (when (or (null start-section)        ;; Search regardless of sections.
            ;; Section header is in this chunk.
            (Man-find-section start-section))
    (let ((end (if start-section
		   (progn
		     (forward-line 1)
		     (back-to-indentation)
		     (save-excursion
		       (Man-next-section 1)
		       (point)))
		 (goto-char (point-min))
		 nil)))
      (while (re-search-forward regexp end t)
	;; An overlay button is preferable because the underlying text
	;; may have text property highlights (Bug#7881).
	(make-button
	 (match-beginning button-pos)
	 (match-end button-pos)
	 'type type
	 'Man-target-string (cond
			     ((numberp target)
			      (match-string target))
			     ((functionp target)
			      target)
			     (t nil)))))))

(defun Man-cleanup-manpage (&optional interactive)
  "Remove overstriking and underlining from the current buffer.
Normally skip any jobs that should have been done by the sed script,
but when called interactively, do those jobs even if the sed
script would have done them."
  (interactive "p")
  (if (or interactive (not Man-sed-script))
      (progn
	(goto-char (point-min))
	(while (search-forward "_\b" nil t) (backward-delete-char 2))
	(goto-char (point-min))
	(while (search-forward "\b_" nil t) (backward-delete-char 2))
	(goto-char (point-min))
	(while (re-search-forward "\\(.\\)\\(\b\\1\\)+" nil t)
	  (replace-match "\\1"))
	(goto-char (point-min))
	(while (re-search-forward "\e\\[[0-9]+m" nil t) (replace-match ""))
	(goto-char (point-min))
	(while (re-search-forward "o\b\\+\\|\\+\bo" nil t) (replace-match "o"))
	))
  (goto-char (point-min))
  (while (re-search-forward "[-|]\\(\b[-|]\\)+" nil t) (replace-match "+"))
  ;; When the header is longer than the manpage name, groff tries to
  ;; condense it to a shorter line interspersed with ^H.  Remove ^H with
  ;; their preceding chars (but don't put Man-overstrike).  (Bug#5566)
  (goto-char (point-min))
  (while (re-search-forward ".\b" nil t) (backward-delete-char 2))
  (Man-softhyphen-to-minus))

(defun Man-bgproc-filter (process string)
  "Manpage background process filter.
When manpage command is run asynchronously, PROCESS is the process
object for the manpage command; when manpage command is run
synchronously, PROCESS is the name of the buffer where the manpage
command is run.  Second argument STRING is the entire string of output."
  (save-excursion
    (let ((Man-buffer (process-buffer process)))
      (if (null (buffer-name Man-buffer)) ;; deleted buffer
	  (set-process-buffer process nil)

	(with-current-buffer Man-buffer
	  (let ((inhibit-read-only t)
	        (beg (marker-position (process-mark process))))
	    (save-excursion
	      (goto-char beg)
	      (insert string)
	      (save-restriction
		(narrow-to-region
		 (save-excursion
		   (goto-char beg)
                   ;; Process whole sections (Bug#36927).
                   (Man-previous-section 1)
                   (point))
		 (point))
		(if Man-fontify-manpage-flag
		    (Man-fontify-manpage)
		  (Man-cleanup-manpage)))
	      (set-marker (process-mark process) (point-max)))))))))

(defun Man-bgproc-sentinel (process msg)
  "Manpage background process sentinel.
When manpage command is run asynchronously, PROCESS is the process
object for the manpage command; when manpage command is run
synchronously, PROCESS is the name of the buffer where the manpage
command is run.  Second argument MSG is the exit message of the
manpage command."
  (let ((Man-buffer (if (stringp process) (get-buffer process)
		      (process-buffer process)))
	(delete-buff nil)
	message)

    (if (null (buffer-name Man-buffer)) ;; deleted buffer
	(or (stringp process)
	    (set-process-buffer process nil))

      (with-current-buffer Man-buffer
	(save-excursion
	  (let ((case-fold-search nil)
                (inhibit-read-only t))
	    (goto-char (point-min))
	    (cond ((or (looking-at "No \\(manual \\)*entry for")
		       (looking-at "[^\n]*: nothing appropriate$"))
		   (setq message (buffer-substring (point)
						   (progn
						     (end-of-line) (point)))
			 delete-buff t))

		  ;; "-k foo", successful exit, but no output (from man-db)
		  ;; ENHANCE-ME: share the check for -k with
		  ;; `Man-highlight-references'.  The \\s- bits here are
		  ;; meant to allow for multiple options with -k among them.
		  ((and (string-match "\\(\\`\\|\\s-\\)-k\\s-" Man-arguments)
			(eq (process-status process) 'exit)
			(= (process-exit-status process) 0)
			(= (point-min) (point-max)))
		   (setq message (format "%s: no matches" Man-arguments)
			 delete-buff t))

		  ((or (stringp process)
		       (not (and (eq (process-status process) 'exit)
				 (= (process-exit-status process) 0))))
		   (or (zerop (length msg))
		       (progn
			 (setq message
			       (concat (buffer-name Man-buffer)
				       ": process "
				       (let ((eos (1- (length msg))))
					 (if (= (aref msg eos) ?\n)
					     (substring msg 0 eos) msg))))
			 (goto-char (point-max))
			 (insert (format "\nprocess %s" msg))))
		   ))
	    (unless delete-buff

	      (run-hooks 'Man-cooked-hook)

	      (Man-build-page-list)
	      (Man-strip-page-headers)
	      (Man-unindent)
	      (Man-goto-page 1 t)

	      (if (not Man-page-list)
		  (let ((args Man-arguments))
		    (setq delete-buff t)

                    ;; Entries hyphenated due to the window's width
                    ;; won't be found in the man database, so remove
                    ;; the hyphenation -- assuming Groff hyphenates
                    ;; either with hyphen-minus (ASCII 45, #x2d),
                    ;; hyphen (#x2010) or soft hyphen (#xad) -- and
                    ;; look again.
		    (if (string-match "[-‐­]" args)
			(let ((str (replace-match "" nil nil args)))
			  (Man-getpage-in-background str))
                      (setq message (format "Can't find the %s manpage"
                                            (Man-page-from-arguments args)))))

		(if Man-fontify-manpage-flag
		    (setq message (format "%s man page formatted"
			                  (Man-page-from-arguments Man-arguments)))
		  (setq message (format "%s man page cleaned up"
			                (Man-page-from-arguments Man-arguments))))
		(unless (and (processp process)
			     (not (eq (process-status process) 'exit)))
		  (setq mode-line-process nil))
		(set-buffer-modified-p nil))))))

      (when delete-buff
        (if (window-live-p (get-buffer-window Man-buffer t))
            (quit-restore-window
             (get-buffer-window Man-buffer t) 'kill)
          (kill-buffer Man-buffer)))

      (when message
        (message "%s" message)))))

(defun Man-page-from-arguments (args)
  ;; Skip arguments and only print the page name.
  (mapconcat
   'identity
   (delete nil
	   (mapcar
	    (lambda (elem)
	      (and (not (string-match "^-" elem))
		   elem))
	    (split-string args " ")))
   " "))

\f
;; ======================================================================
;; set up manual mode in buffer and build alists

(defvar bookmark-make-record-function)

(define-derived-mode Man-mode special-mode "Man"
  "A mode for browsing Un*x manual pages.

The following man commands are available in the buffer.  Try
\"\\[describe-key] <key> RET\" for more information:

\\[man]       Prompt to retrieve a new manpage.
\\[Man-follow-manual-reference]       Retrieve reference in SEE ALSO section.
\\[Man-next-manpage]   Jump to next manpage in circular list.
\\[Man-previous-manpage]   Jump to previous manpage in circular list.
\\[Man-next-section]       Jump to next manpage section.
\\[Man-previous-section]       Jump to previous manpage section.
\\[Man-goto-section]       Go to a manpage section.
\\[Man-goto-see-also-section]       Jumps to the SEE ALSO manpage section.
\\[quit-window]       Deletes the manpage window, bury its buffer.
\\[Man-kill]       Deletes the manpage window, kill its buffer.
\\[describe-mode]       Prints this help text.

The following variables may be of some use.  Try
\"\\[describe-variable] <variable-name> RET\" for more information:

`Man-notify-method'		What happens when manpage is ready to display.
`Man-downcase-section-letters-flag' Force section letters to lower case.
`Man-circular-pages-flag'	Treat multiple manpage list as circular.
`Man-section-translations-alist' List of section numbers and their Un*x equiv.
`Man-filter-list'		Background manpage filter command.
`Man-mode-map'			Keymap bindings for Man mode buffers.
`Man-mode-hook'			Normal hook run on entry to Man mode.
`Man-section-regexp'		Regexp describing manpage section letters.
`Man-heading-regexp'		Regexp describing section headers.
`Man-see-also-regexp'		Regexp for SEE ALSO section (or your equiv).
`Man-first-heading-regexp'	Regexp for first heading on a manpage.
`Man-reference-regexp'		Regexp matching a references in SEE ALSO.
`Man-switches'			Background `man' command switches.

The following key bindings are currently in effect in the buffer:
\\{Man-mode-map}"
  (setq buffer-auto-save-file-name nil
	mode-line-buffer-identification
	(list (default-value 'mode-line-buffer-identification)
	      " {" 'Man-page-mode-string "}")
	truncate-lines t)
  (buffer-disable-undo)
  (auto-fill-mode -1)
  (setq imenu-generic-expression (list (list nil Man-heading-regexp 0)))
  (imenu-add-to-menubar man-imenu-title)
  (set (make-local-variable 'outline-regexp) Man-heading-regexp)
  (set (make-local-variable 'outline-level) (lambda () 1))
  (set (make-local-variable 'bookmark-make-record-function)
       'Man-bookmark-make-record)
  (add-hook 'window-state-change-functions #'Man--window-state-change nil t))

(defun Man-build-section-list ()
  "Build the list of manpage sections."
  (setq Man--sections ())
  (goto-char (point-min))
  (let ((case-fold-search nil))
    (while (re-search-forward Man-heading-regexp nil t)
      (let ((section (match-string 1)))
        (unless (member section Man--sections)
          (push section Man--sections)))
      (forward-line)))
  (setq Man--sections (nreverse Man--sections)))

(defsubst Man-build-references-alist ()
  "Build the list of references (in the SEE ALSO section)."
  (setq Man--refpages nil)
  (save-excursion
    (if (Man-find-section Man-see-also-regexp)
	(let ((start (progn (forward-line 1) (point)))
	      (end (progn
		     (Man-next-section 1)
		     (point)))
	      hyphenated
	      (runningpoint -1))
	  (save-restriction
	    (narrow-to-region start end)
	    (goto-char (point-min))
	    (back-to-indentation)
	    (while (and (not (eobp)) (/= (point) runningpoint))
	      (setq runningpoint (point))
	      (if (re-search-forward Man-hyphenated-reference-regexp end t)
		  (let* ((word (match-string 0))
			 (len (1- (length word))))
		    (if hyphenated
			(setq word (concat hyphenated word)
			      hyphenated nil
			      ;; Update len, in case a reference spans
			      ;; more than two lines (paranoia).
			      len (1- (length word))))
		    (if (memq (aref word len) '(?- ?­))
			(setq hyphenated (substring word 0 len)))
		    (and (string-match Man-reference-regexp word)
                         (not (member word Man--refpages))
                         (push word Man--refpages))))
	      (skip-chars-forward " \t\n,"))))))
  (setq Man--refpages (nreverse Man--refpages)))

(defun Man-build-page-list ()
  "Build the list of separate manpages in the buffer."
  (setq Man-page-list nil)
  (let ((page-start (point-min))
	(page-end (point-max))
	(header ""))
    (goto-char page-start)
    (while (not (eobp))
      (setq header
	    (if (looking-at Man-page-header-regexp)
		(match-string 1)
	      nil))
      ;; Go past both the current and the next Man-first-heading-regexp
      (if (re-search-forward Man-first-heading-regexp nil 'move 2)
	  (let ((p (progn (beginning-of-line) (point))))
	    ;; We assume that the page header is delimited by blank
	    ;; lines and that it contains at most one blank line.  So
	    ;; if we back by three blank lines we will be sure to be
	    ;; before the page header but not before the possible
	    ;; previous page header.
	    (search-backward "\n\n" nil t 3)
	    (if (re-search-forward Man-page-header-regexp p 'move)
		(beginning-of-line))))
      (setq page-end (point))
      (setq Man-page-list (append Man-page-list
				  (list (list (copy-marker page-start)
					      (copy-marker page-end)
					      header))))
      (setq page-start page-end)
      )))

(defun Man-strip-page-headers ()
  "Strip all the page headers but the first from the manpage."
  (let ((inhibit-read-only t)
	(case-fold-search nil)
	(header ""))
    (dolist (page Man-page-list)
      (and (nth 2 page)
	   (goto-char (car page))
	   (re-search-forward Man-first-heading-regexp nil t)
	   (setq header (buffer-substring (car page) (match-beginning 0)))
	   ;; Since the awk script collapses all successive blank
	   ;; lines into one, and since we don't want to get rid of
	   ;; the fast awk script, one must choose between adding
	   ;; spare blank lines between pages when there were none and
	   ;; deleting blank lines at page boundaries when there were
	   ;; some.  We choose the first, so we comment the following
	   ;; line.
	   ;; (setq header (concat "\n" header)))
	   (while (search-forward header (nth 1 page) t)
	     (replace-match ""))))))

(defun Man-unindent ()
  "Delete the leading spaces that indent the manpage."
  (let ((inhibit-read-only t)
	(case-fold-search nil))
    (dolist (page Man-page-list)
      (let ((indent "")
	    (nindent 0))
	(narrow-to-region (car page) (car (cdr page)))
	(if Man-uses-untabify-flag
	    ;; The space characters inserted by `untabify' inherit
	    ;; sticky text properties, which is unnecessary and looks
	    ;; ugly with underlining (Bug#11408).
	    (let ((text-property-default-nonsticky
		   (cons '(face . t) text-property-default-nonsticky)))
	      (untabify (point-min) (point-max))))
	(if (catch 'unindent
	      (goto-char (point-min))
	      (if (not (re-search-forward Man-first-heading-regexp nil t))
		  (throw 'unindent nil))
	      (beginning-of-line)
	      (setq indent (buffer-substring (point)
					     (progn
					       (skip-chars-forward " ")
					       (point))))
	      (setq nindent (length indent))
	      (if (zerop nindent)
		  (throw 'unindent nil))
	      (setq indent (concat indent "\\|$"))
	      (goto-char (point-min))
	      (while (not (eobp))
		(if (looking-at indent)
		    (forward-line 1)
		  (throw 'unindent nil)))
	      (goto-char (point-min)))
	    (while (not (eobp))
	      (or (eolp)
		  (delete-char nindent))
	      (forward-line 1)))
	))))

\f
;; ======================================================================
;; Man mode commands

(defun Man-next-section (n)
  "Move point to Nth next section (default 1)."
  (interactive "p")
  (let ((case-fold-search nil)
        (start (point)))
    (if (looking-at Man-heading-regexp)
	(forward-line 1))
    (if (re-search-forward Man-heading-regexp (point-max) t n)
	(beginning-of-line)
      (goto-char (point-max))
      ;; The last line doesn't belong to any section.
      (forward-line -1))
    ;; But don't move back from the starting point (can happen if `start'
    ;; is somewhere on the last line).
    (if (< (point) start) (goto-char start))))

(defun Man-previous-section (n)
  "Move point to Nth previous section (default 1)."
  (interactive "p")
  (let ((case-fold-search nil))
    (if (looking-at Man-heading-regexp)
	(forward-line -1))
    (if (re-search-backward Man-heading-regexp (point-min) t n)
	(beginning-of-line)
      (goto-char (point-min)))))

(defun Man-find-section (section)
  "Move point to SECTION if it exists, otherwise don't move point.
Returns t if section is found, nil otherwise."
  (let ((curpos (point))
	(case-fold-search nil))
    (goto-char (point-min))
    (if (re-search-forward (concat "^" section) (point-max) t)
	(progn (beginning-of-line) t)
      (goto-char curpos)
      nil)
    ))

(defvar Man--last-section nil)

(defun Man-goto-section (section)
  "Move point to SECTION."
  (interactive
   (let* ((default (if (member Man--last-section Man--sections)
                       Man--last-section
                     (car Man--sections)))
          (completion-ignore-case t)
          (prompt (concat "Go to section (default " default "): "))
          (chosen (completing-read prompt Man--sections
                                   nil nil nil nil default)))
     (list chosen)))
  (setq Man--last-section section)
  (unless (Man-find-section section)
    (error "Section %s not found" section)))


(defun Man-goto-see-also-section ()
  "Move point to the \"SEE ALSO\" section.
Actually the section moved to is described by `Man-see-also-regexp'."
  (interactive)
  (if (not (Man-find-section Man-see-also-regexp))
      (error "%s" (concat "No " Man-see-also-regexp
		     " section found in the current manpage"))))

(defun Man-possibly-hyphenated-word ()
  "Return a possibly hyphenated word at point.
If the word starts at the first non-whitespace column, and the
previous line ends with a hyphen, return the last word on the previous
line instead.  Thus, if a reference to \"tcgetpgrp(3V)\" is hyphenated
as \"tcgetp-grp(3V)\", and point is at \"grp(3V)\", we return
\"tcgetp-\" instead of \"grp\"."
  (save-excursion
    (skip-syntax-backward "w()")
    (skip-chars-forward " \t")
    (let ((beg (point))
	  (word (current-word)))
      (when (eq beg (save-excursion
		      (back-to-indentation)
		      (point)))
	(end-of-line 0)
	(if (eq (char-before) ?-)
	    (setq word (current-word))))
      word)))

(defvar Man--last-refpage nil)

(defun Man-follow-manual-reference (reference)
  "Get one of the manpages referred to in the \"SEE ALSO\" section.
Specify which REFERENCE to use; default is based on word at point."
  (interactive
   (if (not Man--refpages)
       (error "There are no references in the current man page")
     (list
      (let* ((default (or
		       (car (all-completions
			     (let ((word
				    (or (Man-possibly-hyphenated-word)
					"")))
			       ;; strip a trailing '-':
			       (if (string-match "-$" word)
				   (substring word 0
					      (match-beginning 0))
				 word))
			     Man--refpages))
                       (if (member Man--last-refpage Man--refpages)
                           Man--last-refpage
                         (car Man--refpages))))
	     (defaults
	       (mapcar 'substring-no-properties
                       (cons default Man--refpages)))
	     (prompt (concat "Refer to (default " default "): "))
	     (chosen (completing-read prompt Man--refpages
				      nil nil nil nil defaults)))
        chosen))))
  (if (not Man--refpages)
      (error "Can't find any references in the current manpage")
    (setq Man--last-refpage reference)
    (Man-getpage-in-background
     (Man-translate-references reference))))

(defun Man-kill ()
  "Kill the buffer containing the manpage."
  (interactive)
  (quit-window t))

(defun Man-goto-page (page &optional noerror)
  "Go to the manual page on page PAGE."
  (interactive
   (if (not Man-page-list)
       (error "Not a man page buffer")
     (if (= (length Man-page-list) 1)
	 (error "You're looking at the only manpage in the buffer")
       (list (read-minibuffer (format "Go to manpage [1-%d]: "
				      (length Man-page-list)))))))
  (if (and (not Man-page-list) (not noerror))
      (error "Not a man page buffer"))
  (when Man-page-list
    (if (or (< page 1)
	    (> page (length Man-page-list)))
	(user-error "No manpage %d found" page))
    (let* ((page-range (nth (1- page) Man-page-list))
	   (page-start (car page-range))
	   (page-end (car (cdr page-range))))
      (setq Man-current-page page
	    Man-page-mode-string (Man-make-page-mode-string))
      (widen)
      (goto-char page-start)
      (narrow-to-region page-start page-end)
      (Man-build-section-list)
      (Man-build-references-alist)
      (goto-char (point-min)))))


(defun Man-next-manpage ()
  "Find the next manpage entry in the buffer."
  (interactive)
  (if (= (length Man-page-list) 1)
      (error "This is the only manpage in the buffer"))
  (if (< Man-current-page (length Man-page-list))
      (Man-goto-page (1+ Man-current-page))
    (if Man-circular-pages-flag
	(Man-goto-page 1)
      (error "You're looking at the last manpage in the buffer"))))

(defun Man-previous-manpage ()
  "Find the previous manpage entry in the buffer."
  (interactive)
  (if (= (length Man-page-list) 1)
      (error "This is the only manpage in the buffer"))
  (if (> Man-current-page 1)
      (Man-goto-page (1- Man-current-page))
    (if Man-circular-pages-flag
	(Man-goto-page (length Man-page-list))
      (error "You're looking at the first manpage in the buffer"))))

;; Header file support
(defun Man-view-header-file (file)
  "View a header file specified by FILE from `Man-header-file-path'."
  (let ((path Man-header-file-path)
        complete-path)
    (while path
      (setq complete-path (expand-file-name file (car path))
            path (cdr path))
      (if (file-readable-p complete-path)
          (progn (view-file complete-path)
                 (setq path nil))
        (setq complete-path nil)))
    complete-path))

;;; Bookmark Man Support
(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))
(declare-function bookmark-get-bookmark-record "bookmark" (bmk))

(defun Man-default-bookmark-title ()
  "Default bookmark name for Man or WoMan pages.
Uses `Man-name-local-regexp'."
  (save-excursion
    (goto-char (point-min))
    (when (re-search-forward Man-name-local-regexp nil t)
      (skip-chars-forward "\n\t ")
      (buffer-substring-no-properties (point) (line-end-position)))))

(defun Man-bookmark-make-record ()
  "Make a bookmark entry for a Man buffer."
  `(,(Man-default-bookmark-title)
    ,@(bookmark-make-record-default 'no-file)
    (location . ,(concat "man " Man-arguments))
    (man-args . ,Man-arguments)
    (handler . Man-bookmark-jump)))

;;;###autoload
(defun Man-bookmark-jump (bookmark)
  "Default bookmark handler for Man buffers."
  (let* ((man-args (bookmark-prop-get bookmark 'man-args))
         ;; Let bookmark.el do the window handling.
         ;; This let-binding needs to be active during the call to both
         ;; Man-getpage-in-background and accept-process-output.
         (Man-notify-method 'meek)
         (buf (Man-getpage-in-background man-args))
         (proc (get-buffer-process buf)))
    (while (and proc (eq (process-status proc) 'run))
      (accept-process-output proc))
    (bookmark-default-handler
     `("" (buffer . ,buf) . ,(bookmark-get-bookmark-record bookmark)))))

\f
;; Init the man package variables, if not already done.
(Man-init-defvars)

(provide 'man)

;;; man.el ends here

debug log:

solving 5278a1a84d ...
found 5278a1a84d in https://git.savannah.gnu.org/cgit/emacs.git

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

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

	https://git.savannah.gnu.org/cgit/emacs.git

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