Codebase list texinfo / upstream/5.0.dfsg.1 util / texi2dvi
upstream/5.0.dfsg.1

Tree @upstream/5.0.dfsg.1 (Download .tar.gz)

texi2dvi @upstream/5.0.dfsg.1raw · history · blame

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
#! /bin/sh
# texi2dvi --- produce DVI (or PDF) files from Texinfo (or (La)TeX) sources.
# $Id: texi2dvi,v 1.175 2013/02/16 16:50:28 karl Exp $
#
# Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002,
# 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
# Free Software Foundation, Inc.
#
# This program 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.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Originally written by Noah Friedman.
#
# Please send bug reports, etc. to bug-texinfo@gnu.org.
# If possible, please send a copy of the output of the script called with
# the `--debug' option when making a bug report.

test -f /bin/ksh && test -z "$RUNNING_KSH" \
  && { UNAMES=`uname -s`; test "x$UNAMES" = xULTRIX; } 2>/dev/null \
  && { RUNNING_KSH=true; export RUNNING_KSH; exec /bin/ksh $0 ${1+"$@"}; }
unset RUNNING_KSH

# No failure shall remain unpunished.
set -e

# This string is expanded automatically when this file is checked out.
rcs_revision='$Revision: 1.175 $'
rcs_version=`set - $rcs_revision; echo $2`
program=`echo $0 | sed -e 's!.*/!!'`

build_mode=${TEXI2DVI_BUILD_MODE:-local}
build_dir=${TEXI2DVI_BUILD_DIRECTORY:-.}

# Initialize variables for option overriding and otherwise.
# Don't use `unset' since old bourne shells don't have this command.
# Instead, assign them an empty value.
action=compile
batch=false     # interact normally
catcode_special=maybe
debug=false
escape="\\"
expand=false    # true for expansion via makeinfo
includes=
line_error=true # pass --file-line-error to TeX
max_iters=-1    # keep going forever
oname=          # --output
out_lang=dvi
quiet=false     # let the tools' message be displayed
recode=false
set_language=
src_specials=
shell_escape=
latex2html=hevea  # or set to tex4ht
textra=         # Extra TeX commands to insert in the input file.
txiprereq=19990129 # minimum texinfo.tex version with macro expansion
verb=false      # true for verbose mode
translate_file= # name of charset translation file
recode_from=    # if not empty, recode from this encoding to @documentencoding

orig_pwd=`pwd`

# We have to initialize IFS to space tab newline since we save and
# restore IFS and apparently POSIX allows stupid/broken behavior with
# empty-but-set IFS.
# http://lists.gnu.org/archive/html/automake-patches/2006-05/msg00008.html
# We need space, tab and new line, in precisely that order.  And don't leave
# trailing blanks.
space=' '
tab='	'
newline='
'
IFS="$space$tab$newline"

# In case someone pedantic insists on using grep -E.
: ${EGREP=egrep}

# Systems which define $COMSPEC or $ComSpec use semicolons to separate
# directories in TEXINPUTS -- except for Cygwin et al., where COMSPEC
# might be inherited, but : is used.
if test -n "$COMSPEC$ComSpec" \
   && uname | $EGREP -iv 'cygwin|mingw|djgpp' >/dev/null; then
  path_sep=";"
else
  path_sep=":"
fi

# Pacify verbose cds.
CDPATH=${ZSH_VERSION+.}$path_sep

# If $TEX is set to a directory, don't use it.
test -n "$TEX" && test -d "$TEX" && unset TEX

# 
## --------------------- ##
## Auxiliary functions.  ##
## --------------------- ##

# In case `local' is not supported by the shell, provide a function
# that simulates it by simply performing the assignments.  This means
# that we must not expect `local' to work, i.e., we must not (i) rely
# on it during recursion, and (ii) have two local declarations of the
# same variable.  (ii) is easy to check statically, and our test suite
# does make sure there is never twice a static local declaration of a
# variable.  (i) cannot be checked easily, so just be careful.
#
# Note that since we might use a function simulating `local', we can
# no longer rely on the fact that no IFS-splitting is performed.  So,
# while
#
# foo=$bar
#
# is fine (no IFS-splitting), never write
#
# local foo=$bar
#
# but rather
#
# local foo="$bar"
(
  foo=bar
  test_local () {
    local foo=foo
  }
  test_local >/dev/null 2>&1
  test $foo = bar
) || eval '
local () {
  case $1 in
    *=*) eval "$1";;
  esac
}
'


# cd_orig
# -------
# Return to the original directory.
cd_orig ()
{
  # In case $orig_pwd is on a different drive (for DOS).
  cd /

  # Return to the original directory so that
  # - the next file is processed in correct conditions
  # - the temporary file can be removed
  cd "$orig_pwd" || exit 1
}

# func_dirname FILE
# -----------------
# Return the directory part of FILE.
func_dirname ()
{
  dirname "$1" 2>/dev/null \
  || { echo "$1" | sed 's!/[^/]*$!!;s!^$!.!'; }
}


# noexit FILE
# -----------
# Return FILE with one extension remove.  foo.bar.baz -> foo.bar.
noext ()
{
  echo "$1" | sed -e 's/\.[^/.][^/.]*$//'
}


# absolute NAME -> ABS-NAME
# -------------------------
# Return an absolute path to NAME.
absolute ()
{
  case $1 in
   [\\/]* | ?:[\\/]*)
      # Absolute paths don't need to be expanded.
      echo "$1"
      ;;
   *) local slashes
      slashes=`echo "$1" | sed -n 's,.*[^/]\(/*\)$,\1,p'`
      local rel
      rel=$orig_pwd/`func_dirname "$1"`
      if test -d "$rel"; then
        (cd "$rel" 2>/dev/null \
         && local n
         n=`pwd`/`basename "$1"`"$slashes"
         echo "$n")
      else
        error 1 "not a directory: $rel"
      fi
      ;;
  esac
}


# ensure_dir DIR1 DIR2...
# -----------------------
# Make sure the directories exist.
ensure_dir ()
{
  for dir
  do
    # Beware that in parallel builds we may have several concurrent
    # attempts to create the directory.  So fail only if "mkdir"
    # failed *and* the directory still does not exist.
    test -d "$dir" \
      || mkdir "$dir" \
      || test -d "$dir" \
      || error 1 "cannot create directory: $dir"
  done
}


# error EXIT_STATUS LINE1 LINE2...
# --------------------------------
# Report an error and exit with failure if EXIT_STATUS is non-null.
error ()
{
  local s="$1"
  shift
  report "$@"
  if test "$s" != 0; then
    exit $s
  fi
}


# findprog PROG
# -------------
# Return true if PROG is somewhere in PATH, else false.
findprog ()
{
  local saveIFS="$IFS"
  IFS=$path_sep  # break path components at the path separator
  for dir in $PATH; do
    IFS=$saveIFS
    # The basic test for an executable is `test -f $f && test -x $f'.
    # (`test -x' is not enough, because it can also be true for directories.)
    # We have to try this both for $1 and $1.exe.
    #
    # Note: On Cygwin and DJGPP, `test -x' also looks for .exe.  On Cygwin,
    # also `test -f' has this enhancement, but not on DJGPP.  (Both are
    # design decisions, so there is little chance to make them consistent.)
    # Thusly, it seems to be difficult to make use of these enhancements.
    #
    if   { test -f "$dir/$1"     && test -x "$dir/$1"; } \
      || { test -f "$dir/$1.exe" && test -x "$dir/$1.exe"; }; then
      return 0
    fi
  done
  return 1
}

# report LINE1 LINE2...
# ---------------------
# Report some information on stderr.
report ()
{
  for i in "$@"
  do
    echo >&2 "$0: $i"
  done
}


# run COMMAND-LINE
# ----------------
# Run the COMMAND-LINE verbosely, and catching errors as failures.
run ()
{
  verbose "Running $@"
  "$@" 2>&5 1>&2 \
  || error 1 "$1 failed"
}


# usage
# -----
# Display usage and exit successfully.
usage ()
{
  # We used to simply have `echo "$usage"', but coping with the
  # changing behavior of `echo' is much harder than simply using a
  # here-doc.
  #
  #             echo '\noto'   echo '\\noto'   echo -e '\\noto'
  # bash 3.1      \noto           \\noto          \noto
  # bash 3.2       %oto           \noto           -e \noto
  #
  # where % denotes the eol character.
  cat <<EOF
Usage: $program [OPTION]... FILE...
  or:  texi2pdf [OPTION]... FILE...
  or:  pdftexi2dvi [OPTION]... FILE...

Run each Texinfo or (La)TeX FILE through TeX in turn until all
cross-references are resolved, building all indices.  The directory
containing each FILE is searched for included files.  The suffix of FILE
is used to determine its language ((La)TeX or Texinfo).  To process
(e)plain TeX files, set the environment variable LATEX=tex.

In order to make texi2dvi a drop-in replacement of TeX/LaTeX in AUC-TeX,
the FILE may also be composed of the following simple TeX commands.
  \`\\input{FILE}'     the actual file to compile
  \`\\nonstopmode'     same as --batch

When invoked as \`texi2pdf' or \`pdftexi2dvi', or given the option --pdf
or --dvipdf, generate PDF output.  Otherwise, generate DVI.

General options:
  -b, --batch         no interaction
  -D, --debug         turn on shell debugging (set -x)
  -h, --help          display this help and exit successfully
  -o, --output=OFILE  leave output in OFILE; only one input FILE is allowed
  -q, --quiet         no output unless errors (implies --batch)
  -s, --silent        same as --quiet
  -v, --version       display version information and exit successfully
  -V, --verbose       report on what is done

Output format:
      --dvi     output a DVI file [default]
      --dvipdf  output a PDF file via DVI (using a dvi-to-pdf program)
      --html    output an HTML file from LaTeX, using HeVeA
      --info    output an Info file from LaTeX, using HeVeA
  -p, --pdf     use pdftex or pdflatex for processing
      --ps      output a PostScript file via DVI (using dvips)
      --text    output a plain text file from LaTeX, using HeVeA

TeX tuning:
  -@                         use @input instead of \input for preloaded Texinfo
  -e, -E, --expand           force macro expansion using makeinfo
  -I DIR                     search DIR for Texinfo files
  -l, --language=LANG        specify LANG for FILE, either latex or texinfo
      --no-line-error        do not pass --file-line-error to TeX
  -r, --recode               call recode before TeX to translate input
      --recode-from=ENC      recode from ENC to the @documentencoding
      --shell-escape         pass --shell-escape to TeX
      --src-specials         pass --src-specials to TeX
  -t, --command=CMD          insert CMD in copy of input file
   or --texinfo=CMD          multiple values accumulate
      --translate-file=FILE  use given charset translation file for TeX

Build modes:
  --build=MODE         specify the treatment of auxiliary files [$build_mode]
      --tidy           same as --build=tidy
  -c, --clean          same as --build=clean
      --build-dir=DIR  specify where the tidy compilation is performed;
                         implies --tidy;
                         defaults to TEXI2DVI_BUILD_DIRECTORY [$build_dir]
  --mostly-clean       remove the auxiliary files and directories
                         but not the output
  --max-iterations=N   don't process files more than N times

The MODE specifies where the TeX compilation takes place, and, as a
consequence, how auxiliary files are treated.  The build mode
can also be set using the environment variable TEXI2DVI_BUILD_MODE.

Valid MODEs are:
  \`local'      compile in the current directory, leaving all the auxiliary
               files around.  This is the traditional TeX use.
  \`tidy'       compile in a local *.t2d directory, where the auxiliary files
               are left.  Output files are copied back to the original file.
  \`clean'      same as \`tidy', but remove the auxiliary directory afterwards.
               Every compilation therefore requires the full cycle.

Using the \`tidy' mode brings several advantages:
  - the current directory is not cluttered with plethora of temporary files.
  - clutter can be even further reduced using --build-dir=dir: all the *.t2d
    directories are stored there.
  - clutter can be reduced to zero using, e.g., --build-dir=/tmp/\$USER.t2d
    or --build-dir=\$HOME/.t2d.
  - the output file is updated after every successful TeX run, for
    sake of concurrent visualization of the output.  In a \`local' build
    the viewer stops during the whole TeX run.
  - if the compilation fails, the previous state of the output file
    is preserved.
  - PDF and DVI compilation are kept in separate subdirectories
    preventing any possibility of auxiliary file incompatibility.

On the other hand, because \`tidy' compilation takes place in another
directory, occasionally TeX won't be able to find some files (e.g., when
using \\graphicspath): in that case, use -I to specify the additional
directories to consider.

The values of the BIBTEX, DVIPDF, DVIPS, HEVEA, LATEX, MAKEINDEX,
MAKEINFO, PDFLATEX, PDFTEX, T4HT, TEX, TEX4HT, TEXINDEX, and THUMBPDF
environment variables are used to run those commands, if they are set.

Regarding --dvipdf, if DVIPDF is not set in the environment, the
following programs are looked for (in this order): dvipdfmx dvipdfm
dvipdf dvi2pdf dvitopdf.

Any CMD strings are added after @setfilename for Texinfo input, or in
the first line for LaTeX input.

Report bugs to bug-texinfo@gnu.org,
general questions and discussion to help-texinfo@gnu.org.
GNU Texinfo home page: <http://www.gnu.org/software/texinfo/>
General help using GNU software: <http://www.gnu.org/gethelp/>
EOF
  exit 0
}


# verbose WORD1 WORD2
# -------------------
# Report some verbose information.
verbose ()
{
  if $verb; then
    echo >&2 "$0: $@"
  fi
}


# version
# -------
# Display version info and exit successfully.
version ()
{
  cat <<EOF
texi2dvi (GNU Texinfo 5.0) $rcs_version

Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
EOF
  exit 0
}


## ---------------- ##
## Handling lists.  ##
## ---------------- ##


# list_append LIST-NAME ELEM
# --------------------------
# Set LIST-NAME to its former contents, with ELEM appended.
list_append ()
{
  local la_l="$1"
  shift
  eval set X \$$la_l "$@"
  shift
  eval $la_l=\""$@"\"
}


# list_concat_dirs LIST-NAME DIR-LIST
# -----------------------------------
# Append to LIST-NAME all the components (included empty) from
# the $path_sep separated list DIR-LIST.  Make the paths absolute.
list_concat_dirs ()
{
  local lcd_list="$1"
  # Empty path components are meaningful to tex.  We rewrite them as
  # `EMPTY' so they don't get lost when we split on $path_sep.
  # Hopefully no one will have an actual directory named EMPTY.
  local replace_EMPTY="-e 's/^$path_sep/EMPTY$path_sep/g' \
                       -e 's/$path_sep\$/${path_sep}EMPTY/g' \
                       -e 's/$path_sep$path_sep/${path_sep}EMPTY:/g'"
  save_IFS=$IFS
  IFS=$path_sep
  set x `echo "$2" | eval sed $replace_EMPTY`; shift
  IFS=$save_IFS
  local dir
  for dir
  do
    case $dir in
      EMPTY)
       list_append $lcd_list ""
       ;;
      *)
       if test -d $dir; then
          dir=`absolute "$dir"`
         list_append $lcd_list "$dir"
       fi
       ;;
    esac
  done
}


# list_prefix LIST-NAME SEP -> STRING
# -----------------------------------
# Return a string that is composed of the LIST-NAME with each item
# preceded by SEP.
list_prefix ()
{
  local lp_p="$2"
  eval set X \$$1
  shift
  local lp_res
  for i
  do
    lp_res="$lp_res \"$lp_p\" \"$i\""
  done
  echo "$lp_res"
}

# list_infix LIST-NAME SEP -> STRING
# ----------------------------------
# Same as list_prefix, but a separator.
list_infix ()
{
  eval set X \$$1
  shift
  local la_IFS="$IFS"
  IFS=$path_sep
  echo "$*"
  IFS=$la_IFS
}

# list_dir_to_abs LIST-NAME
# -------------------------
# Convert the list to using only absolute dir names.
# Currently unused, but should replace absolute_filenames some day.
list_dir_to_abs ()
{
  local ld_l="$1"
  eval set X \$$ld_l
  shift
  local ld_res
  for dir
  do
    dir=`absolute "$dir"`
    test -d "$dir" || continue
    ld_res="$ld_res \"$dir\""
  done
  set X $ld_res; shift
  eval $ld_l=\"$@\"
}


## ------------------------------ ##
## Language auxiliary functions.  ##
## ------------------------------ ##


# out_lang_set LANG
# -----------------
out_lang_set ()
{
  case $1 in
    dvi|dvipdf|html|info|pdf|ps|text) out_lang=$1;;
    *) error 1 "invalid output format: $1";;
  esac
}


# out_lang_tex
# ------------
# Return the tex output language (DVI or PDF) for $OUT_LANG.
out_lang_tex ()
{
  case $out_lang in
    dvi | ps | dvipdf ) echo dvi;;
    pdf ) echo $out_lang;;
    html | info | text ) echo $out_lang;;
    *)    error 1 "invalid out_lang: $1";;
  esac
}


# out_lang_ext
# ------------
# Return the extension for $OUT_LANG.
out_lang_ext ()
{
  case $out_lang in
    dvipdf ) echo pdf;;
    dvi | html | info | pdf | ps | text ) echo $out_lang;;
    *)    error 1 "invalid out_lang: $1";;
  esac
}


## ------------------------- ##
## TeX auxiliary functions.  ##
## ------------------------- ##

# Save TEXINPUTS so we can construct a new TEXINPUTS path for each file.
# Likewise for bibtex and makeindex.
tex_envvars="BIBINPUTS BSTINPUTS DVIPSHEADERS INDEXSTYLE MFINPUTS MPINPUTS \
TEXINPUTS TFMFONTS"
for var in $tex_envvars; do
  eval ${var}_orig=\$$var
  export $var
done


# absolute_filenames TEX-PATH -> TEX-PATH
# ---------------------------------------
# Convert relative paths to absolute paths, so we can run in another
# directory (e.g., in tidy build mode, or during the macro-support
# detection).  Prepend ".".
absolute_filenames ()
{
  # Empty path components are meaningful to tex.  We rewrite them as
  # `EMPTY' so they don't get lost when we split on $path_sep.
  # Hopefully no one will have an actual directory named EMPTY.
  local replace_empty="-e 's/^$path_sep/EMPTY$path_sep/g' \
                       -e 's/$path_sep\$/${path_sep}EMPTY/g' \
                       -e 's/$path_sep$path_sep/${path_sep}EMPTY:/g'"
  local res
  res=`echo "$1" | eval sed $replace_empty`
  save_IFS=$IFS
  IFS=$path_sep
  set x $res; shift
  res=.
  for dir
  do
    case $dir in
      EMPTY)
        res=$res$path_sep
        ;;
      *)
        if test -d "$dir"; then
          res=$res$path_sep`absolute "$dir"`
        else
          # Even if $dir is not a directory, preserve it in the path.
          # It might contain metacharacters that TeX will expand in
          # turn, e.g., /some/path/{a,b,c}.  This will not get the
          # implicit absolutification of the path, but we can't help that.
          res=$res$path_sep$dir
        fi
        ;;
    esac
  done
  echo "$res"
}


# output_base_name FILE
# ---------------------
# The name of FILE, possibly renamed to satisfy --output.
# FILE is local, there is no directory part.
output_base_name ()
{
  case $oname in
    '') echo "$1";;
     *) local out_noext
        out_noext=`noext "$oname"`
        local file_ext
        file_ext=`echo "$1" | sed 's/^.*\.//'`
        echo "$out_noext.$file_ext"
      ;;
  esac
}


# destdir
# -------
# Return the name of the directory where the output is expected.
destdir ()
{
  case $oname in
    '')  echo "$orig_pwd";;
    *)   dirname "$oname";;
  esac
}


# move_to_dest FILE...
# --------------------
# Move FILE to the place where the user expects it.  Truly move it, that
# is, it must not remain in its build location unless that is also the
# output location.  (Otherwise it might appear as an extra file in make
# distcheck.)
#
# FILE can be the principal output (in which case -o directly applies), or
# an auxiliary file with the same base name.
move_to_dest ()
{
#  echo "move_to_dest $*, tidy=$tidy, oname=$oname"

  # If we built in place and have no output name, there is nothing to
  # do, so just return.
  case $tidy:$oname in
    false:) return;;
  esac

  local destfile
  local destdir
  local destbase
  local sourcedir
  local sourcebase

  for file
  do
    test -f "$file" \
    || error 1 "no such file or directory: $file"
    case $tidy:$oname in
      true:)  destdir=$orig_pwd
              destfile=$destdir/$file;;
      true:*) destfile=`output_base_name "$file"`
              destdir=`dirname "$destfile"`;;
      false:*) destfile=$oname
               destdir=`dirname "$destfile"`;;
    esac
 
    # We want to compare the source location and the output location,
    # and if they are different, do the move.  But if they are the
    # same, we must preserve the source.  Since we can't assume
    # stat(1) or test -ef is available, resort to comparing the
    # directory names, canonicalized with pwd.  We can't use cmp -s
    # since the output file might not actually change from run to run;
    # e.g., TeX DVI output is timestamped to only the nearest minute.
    destdir=`cd "$destdir" && pwd`
    destbase=`basename "$destfile"`

    sourcedir=`dirname "$file"`
    sourcedir=`cd "$sourcedir" && pwd`
    sourcebase=`basename "$file"`

    if test "$sourcedir/$sourcebase" != "$destdir/$destbase"; then
      verbose "Moving $file to $destfile"
      rm -f "$destfile"
      mv "$file" "$destfile"
    fi
  done
}


## --------------------- ##
## Managing xref files.  ##
## --------------------- ##

# aux_file_p FILE
# ---------------
# Return with success if FILE is an aux file.
aux_file_p ()
{
  test -f "$1" || return 1
  case $1 in
    *.aux) return 0;;
    *)     return 1;;
  esac
}

# bibaux_file_p FILE
# ------------------
# Return with success if FILE is an aux file containing citation
# requests.
bibaux_file_p ()
{
  test -s "$1" || return 1
  if (grep '^\\bibstyle[{]' "$1"   \
      && grep '^\\bibdata[{]' "$1" \
      ## The following line is suspicious: fails when there
      ## are citations in sub aux files.  We need to be
      ## smarter in this case.
      ## && grep '^\\citation[{]' "$f"
      ) >&6 2>&1;
  then
    return 0
  fi
  return 1
}

# index_file_p FILE
# -----------------
# Return with success if FILE is an index file.
index_file_p ()
{
  test -f "$1" || return 1
  case $in_lang:$latex2html:`out_lang_tex`:`sed '1q' "$1"` in
    # When working with TeX4HT, *.idx are created by LaTeX.  They must
    # be processed to produce *.4ix, *.4dx files.  The *.4dx file is
    # passed to makeindex to produce the *.ind file.  This sequence is
    # handled by run_index, so we are only interested in the *.idx
    # files, which have each "\indexentry" preceded by a
    # "\beforeentry".
    latex:tex4ht:html:"\\beforeentry {"*) return 0;;

    # When index.sty is used, there is a space before the brace.
    latex:*:*:"\\indexentry{"*|latex:*:*:"\\indexentry {"*) return 0;;

    texinfo:*:*:"\\entry{"*) return 0;;

    *) return 1;;
  esac
}

# xref_file_p FILE
# ----------------
# Return with success if FILE is an xref file (indexes, tables and lists).
xref_file_p ()
{
  test -f "$1" || return 1
  # If the file is not suitable to be an index or xref file, don't
  # process it.  It's suitable if the first character is a
  # backslash or right quote or at, as long as the first line isn't
  # \input texinfo.
  case `sed '1q' "$1"` in
    "\\input texinfo"*) return 1;;
    [\\''@]*)           return 0;;
           *)           return 1;;
  esac
}


# generated_files_get FILENAME-NOEXT [PREDICATE-FILTER]
# -----------------------------------------------------
# Return the list of files generated by the TeX compilation of FILENAME-NOEXT.
generated_files_get ()
{
  local filter=true
  if test -n "$2"; then
    filter=$2
  fi

  # Gather the files created by TeX.
  (
    if test -f "$1.log"; then
      sed -n -e "s,^\\\\openout.* = \`\\(.*\\)'\\.,\\1,p" "$1.log"
    fi
    echo "$1.log"
  ) |
  # Depending on these files, infer outputs from other tools.
  while read file; do
    echo $file
    case $in_lang in
      texinfo)
        # texindex: texinfo.cp -> texinfo.cps
       if index_file_p $file; then
         echo ${file}s
       fi
       ;;
      latex)
        if aux_file_p $file; then
          # bibtex: *.aux -> *.bbl and *.blg.
          echo $file | sed 's/^\(.*\)\.aux$/\1.bbl/'
          echo $file | sed 's/^\(.*\)\.aux$/\1.blg/'
          # -recorder: .fls
          echo $file | sed 's/^\(.*\)\.aux$/\1.fls/'
       fi
       ;;
    esac
  done |
  # Filter existing files matching the criterion.
  #
  # With an input file name containing a space, this produces a
  # "command not found" message (and filtering is ineffective).
  # The situation with a newline is presumably even worse.
  while read file; do
    if $filter "$file"; then
      echo $file
    fi
  done |
  sort |
  # Some files are opened several times, e.g., listings.sty's *.vrb.
  uniq
}


# xref_files_save
# ---------------
# Save the xref files.
xref_files_save ()
{
  # Save copies of auxiliary files for later comparison.
  xref_files_orig=`generated_files_get "$in_noext" xref_file_p`
  if test -n "$xref_files_orig"; then
    verbose "Backing up xref files: $xref_files_orig"
    # The following line improves `cp $xref_files_orig "$work_bak"'
    # by preserving the directory parts.  Think of
    # cp chap1/main.aux chap2/main.aux $work_bak.
    #
    # Users may have, e.g., --keep-old-files.  Don't let this interfere.
    # (Don't use unset for the sake of ancient shells.)
    TAR_OPTIONS=; export TAR_OPTIONS
    tar cf - $xref_files_orig | (cd "$work_bak" && tar xf -)
  fi
}


# xref_files_changed
# ------------------
# Whether the xref files were changed since the previous run.
xref_files_changed ()
{
  # LaTeX (and the package changebar) report in the LOG file if it
  # should be rerun.  This is needed for files included from
  # subdirs, since texi2dvi does not try to compare xref files in
  # subdirs.  Performing xref files test is still good since LaTeX
  # does not report changes in xref files.
  if grep "Rerun to get" "$in_noext.log" >&6 2>&1; then
    return 0
  fi

  # If old and new lists don't at least have the same file list,
  # then one file or another has definitely changed.
  xref_files_new=`generated_files_get "$in_noext" xref_file_p`
  verbose "Original xref files = $xref_files_orig"
  verbose "New xref files      = $xref_files_new"
  if test "x$xref_files_orig" != "x$xref_files_new"; then
    return 0
  fi

  # Compare each file until we find a difference.
  for this_file in $xref_files_new; do
    verbose "Comparing xref file `echo $this_file | sed 's|\./||g'` ..."
    # cmp -s returns nonzero exit status if files differ.
    if cmp -s "$this_file" "$work_bak/$this_file"; then :; else
      verbose "xref file `echo $this_file | sed 's|\./||g'` differed ..."
      if $debug; then
        diff -u "$work_bak/$this_file" "$this_file"
      fi
      return 0
    fi
  done

  # No change.
  return 1
}



## ----------------------- ##
## Running the TeX suite.  ##
## ----------------------- ##



# run_tex ()
# ----------
# Run TeX as "$tex $in_input", taking care of errors and logs.
run_tex ()
{
  case $in_lang:$latex2html:`out_lang_tex` in
    latex:*:dvi|latex:tex4ht:html)
        tex=${LATEX:-latex};;
    latex:*:pdf)
        tex=${PDFLATEX:-pdflatex};;
    texinfo:*:dvi)
        # MetaPost also uses the TEX environment variable.  If the user
        # has set TEX=latex for that reason, don't bomb out.
        case $TEX in
          *latex) tex=tex;; # don't bother trying to find etex
               *) tex=$TEX
        esac;;
    texinfo:*:pdf) tex=$PDFTEX;;

    *) error 1 "$out_lang not supported for $in_lang";;
  esac

  # do the special catcode trick for ~ in filenames only for Texinfo,
  # not LaTeX.
  if test x"$in_lang" = xtexinfo && test $catcode_special = maybe; then
    catcode_special=true
  else
    catcode_special=false
  fi

  # Beware of aux files in subdirectories that require the
  # subdirectory to exist.
  case $in_lang:$tidy in
    latex:true)
       sed -n 's|^[ ]*\\include{\(.*\)/.*}.*|\1|p' "$in_input" |
       sort -u |
       while read d
       do
         ensure_dir "$work_build/$d"
       done
       ;;
  esac

  # Note that this will be used via an eval: quote properly.
  local cmd="$tex"

  # If possible, make TeX report error locations in GNU format.
  if $line_error; then
    if test "${tex_help:+set}" != set; then
      # Go to a temporary directory to try --help, since old versions that
      # don't accept --help will generate a texput.log.
      tex_help_dir=$t2ddir/tex_help
      ensure_dir "$tex_help_dir"
      tex_help=`cd "$tex_help_dir" >&6 && $tex --help </dev/null 2>&1 || true`
    fi
    # The mk program and perhaps others want to parse TeX's
    # original error messages.
    case $tex_help in
      *file-line-error*) cmd="$cmd --file-line-error";;
    esac
  fi

  # Tell TeX about TCX file, if specified.
  test -n "$translate_file" && cmd="$cmd --translate-file=$translate_file"

  # Tell TeX to make source specials (for backtracking from output to
  # source, given a sufficiently smart editor), if specified.
  test -n "$src_specials" && cmd="$cmd $src_specials"

  # Tell TeX to allow running external executables
  test -n "$shell_escape" && cmd="$cmd $shell_escape"

  # Tell TeX to be batch if requested.
  if $batch; then
    # \batchmode does not show terminal output at all, so we don't
    # want that.  And even in batch mode, TeX insists on having input
    # from the user.  Close its stdin to make it impossible.
    cmd="$cmd </dev/null '${escape}nonstopmode'"
  fi

  # we'd like to handle arbitrary input file names, especially
  # foo~bar/a~b.tex, since Debian likes ~ characters.
  if $catcode_special; then
    # $normaltilde is just to reduce line length in this source file.
    # The idea is to define \normaltilde as a catcode other ~ character,
    # then make the active ~ be equivalent to that, instead of the plain
    # TeX tie.  Then when the active ~ appears in the filename, it will
    # be expanded to itself, as far as \input will see.  (This is the
    # same thing that texinfo.tex does in general, BTW.)
    normaltilde="${escape}catcode126=12 ${escape}def${escape}normaltilde{~}"
    cmd="$cmd '$normaltilde${escape}catcode126=13 ${escape}let~\normaltilde '"
  fi
  # Other special (non-active) characters could be supported by
  # resetting their catcodes to other on the command line and changing
  # texinfo.tex to initialize everything to plain catcodes.  Maybe someday.

  # append the \input command.
  cmd="$cmd '${escape}input'"

  # TeX's \input does not (easily or reliably) support whitespace
  # characters or other special characters in file names.  Our intensive
  # use of absolute file names makes this worse: the enclosing directory
  # names may include white spaces.  Improve the situation using a
  # symbolic link to the filename in the current directory, in tidy mode
  # only.  Do not alter in_input.
  #
  # The filename is almost always tokenized using plain TeX conventions
  # (the exception would be if the user made a texinfo.fmt file).  Not
  # all the plain TeX special characters cause trouble, but there's no
  # harm in making the link.
  #
  case $tidy:`func_dirname "$in_input"` in
    true:*["$space$tab$newline\"#\$%\\^_{}~"]*)
      _run_tex_file_name=`basename "$in_input"`
      if test ! -f "$_run_tex_file_name"; then
        # It might not be a file, clear it.
        run rm -f "$_run_tex_file_name"
        run ln -s "$in_input"
      fi
      cmd="$cmd '$_run_tex_file_name'"
      ;;

    *)
      cmd="$cmd '$in_input'"
      ;;
  esac

  verbose "$0: Running $cmd ..."
  if eval "$cmd" >&5; then
    case $out_lang in
      dvi | pdf ) move_to_dest "$in_noext.$out_lang";;
    esac
  else
    error 1 "$tex exited with bad status, quitting."
  fi
}

# run_bibtex ()
# -------------
# Run bibtex on current file.
# - If its input (AUX) exists.
# - If some citations are missing (LOG contains `Citation').
#   or the LOG complains of a missing .bbl
#
# Don't try to be too smart:
#
# 1. Running bibtex only if the bbl file exists and is older than
# the LaTeX file is wrong, since the document might include files
# that have changed.
#
# 3. Because there can be several AUX (if there are \include's),
# but a single LOG, looking for missing citations in LOG is
# easier, though we take the risk to match false messages.
run_bibtex ()
{
  case $in_lang in
    latex)   bibtex=${BIBTEX:-bibtex};;
    texinfo) return;;
  esac

  # "Citation undefined" is for LaTeX, "Undefined citation" for btxmac.tex.
  # The no .aux && \bibdata test is also for btxmac, in case it was the
  # first run of a bibtex-using document.  Otherwise, it's possible that
  # bibtex would never be run.
  if test -r "$in_noext.aux" \
     && test -r "$in_noext.log" \
     && ((grep 'Warning:.*Citation.*undefined' "$in_noext.log" \
          || grep '.*Undefined citation' "$in_noext.log" \
          || grep 'No file .*\.bbl\.' "$in_noext.log") \
          || (grep 'No \.aux file' "$in_noext.log" \
              && grep '^\\bibdata' "$in_noext.aux")) \
        >&6 2>&1; \
  then
    for f in `generated_files_get "$in_noext" bibaux_file_p`
    do
      run $bibtex "$f"
    done
  fi
}

# run_index ()
# ------------
# Run texindex (or makeindex or texindy) on current index files.  If
# they already exist, and after running TeX a first time the index
# files don't change, then there's no reason to run TeX again.  But we
# won't know that if the index files are out of date or nonexistent.
run_index ()
{
  local index_files
  index_files=`generated_files_get $in_noext index_file_p`
  test -n "$index_files" \
  || return 0

  : ${MAKEINDEX:=makeindex}
  : ${TEXINDEX:=texindex}
  : ${TEXINDY:=texindy}

  local index_file
  local index_noext
  case $in_lang:$latex2html:`out_lang_tex` in
    latex:tex4ht:html)
      for index_file in $index_files
      do
        index_noext=`noext "$index_file"`
        run tex \
            '\def\filename{{'"$index_noext"'}{idx}{4dx}{ind}}
             \input idxmake.4ht'
        run $MAKEINDEX -o $index_noext.ind $index_noext.4dx
      done
      ;;

    latex:*)
      if $TEXINDY --version >&6 2>&1; then
        run $TEXINDY $index_files
      else
        run $MAKEINDEX $index_files
      fi
      ;;

    texinfo:*)
      run $TEXINDEX $index_files
      ;;
  esac
}


# run_tex4ht ()
# -------------
# Run the last two phases of TeX4HT: tex4ht extracts the HTML from the
# instrumented DVI file, and t4ht converts the figures and installs
# the files when given -d.
#
# Because knowing exactly which files are created is complex (in
# addition the names are not simple to compute), which makes it
# difficult to install the output files in a second step, it is much
# simpler to install directly the output files.
run_tex4ht ()
{
  case $in_lang:$latex2html:`out_lang_tex` in
    latex:tex4ht:html)
      : ${TEX4HT:=tex4ht} ${T4HT:=t4ht}
      run "$TEX4HT" "-f/$in_noext"
      # Do not remove the / after the destdir.
      run "$T4HT" "-d`destdir`/" "-f/$in_noext"
      ;;
  esac
}


# run_thumbpdf ()
# ---------------
run_thumbpdf ()
{
  if test `out_lang_tex` = pdf \
     && test -r "$in_noext.log" \
     && grep 'thumbpdf\.sty'  "$in_noext.log" >&6 2>&1; \
  then
    thumbpdf=${THUMBPDF:-thumbpdf}
    thumbcmd="$thumbpdf $in_dir/$in_noext"
    verbose "Running $thumbcmd ..."
    if $thumbcmd >&5; then
      run_tex
    else
      report "$thumbpdf exited with bad status." \
             "Ignoring its output."
    fi
  fi
}


# run_dvipdf FILE.dvi
# -------------------
# Convert FILE.dvi to FILE.pdf.
run_dvipdf ()
{
  # Find which dvi->pdf program is available.
  if test -z "$dvipdf"; then
    for i in "$DVIPDF" dvipdfmx dvipdfm dvipdf dvi2pdf dvitopdf; do
      if findprog $i; then
        dvipdf=$i
      fi
    done
  fi
  # These tools have varying interfaces, some 'input output', others
  # 'input -o output'.  They all seem to accept 'input' only,
  # outputting using the expected file name.
  run $dvipdf "$1"
  if test ! -f `echo "$1" | sed -e 's/\.dvi$/.pdf/'`; then
    error 1 "cannot find output file"
  fi
}

# run_tex_suite ()
# ----------------
# Run the TeX tools until a fix point is reached.
run_tex_suite ()
{
  # Move to the working directory.
  if $tidy; then
    verbose "cd $work_build"
    cd "$work_build" || exit 1
  fi

  # Count the number of cycles.
  local cycle=0

  while :; do
    # check for probably LaTeX loop (e.g. varioref)
    if test $cycle -eq "$max_iters"; then
      error 0 "Maximum of $max_iters cycles exceeded"
      break
    fi

    # report progress
    cycle=`expr $cycle + 1`
    verbose "Cycle $cycle for $command_line_filename"

    xref_files_save

    # We run bibtex first, because I can see reasons for the indexes
    # to change after bibtex is run, but I see no reason for the
    # converse.
    run_bibtex
    run_index
    run_core_conversion

    xref_files_changed || break
  done

  # If we were using thumbpdf and producing PDF, then run thumbpdf
  # and TeX one last time.
  run_thumbpdf

  # If we are using tex4ht, call it.
  run_tex4ht

  # Install the result if we didn't already (i.e., if the output is
  # dvipdf or ps).
  case $latex2html:$out_lang in
    *:dvipdf)
      run_dvipdf "$in_noext.`out_lang_tex`"
      move_to_dest "$in_noext.`out_lang_ext`"
      ;;
    *:ps)
      : ${DVIPS:=dvips}
      run $DVIPS -o "$in_noext.`out_lang_ext`" "$in_noext.`out_lang_tex`"
      move_to_dest "$in_noext.`out_lang_ext`"
      ;;
  esac

  cd_orig
}

## -------------------------------- ##
## TeX processing auxiliary tools.  ##
## -------------------------------- ##


# A sed script that preprocesses Texinfo sources in order to keep the
# iftex sections only.  We want to remove non-TeX sections, and comment
# (with `@c _texi2dvi') TeX sections so that makeinfo does not try to
# parse them.  Nevertheless, while commenting TeX sections, don't
# comment @macro/@end macro so that makeinfo does propagate them.
# Unfortunately makeinfo --iftex --no-ifinfo doesn't work well enough
# (yet), makeinfo can't parse the TeX commands, so work around with sed.
#
# We assume that `@c _texi2dvi' starting a line is not present in the
# document.
#
comment_iftex=\
'/^@tex/,/^@end tex/{
  s/^/@c _texi2dvi/
}
/^@iftex/,/^@end iftex/{
  s/^/@c _texi2dvi/
  /^@c _texi2dvi@macro/,/^@c _texi2dvi@end macro/{
    s/^@c _texi2dvi//
  }
}
/^@ifnottex/,/^@end ifnottex/{
  s/^/@c (_texi2dvi)/
}
/^@ifinfo/,/^@end ifinfo/{
  /^@node/p
  /^@menu/,/^@end menu/p
  t
  s/^/@c (_texi2dvi)/
}
s/^@ifnotinfo/@c _texi2dvi@ifnotinfo/
s/^@end ifnotinfo/@c _texi2dvi@end ifnotinfo/'

# Uncommenting is simpler: remove any leading `@c texi2dvi'; repeated
# copies can sneak in via macro invocations.
uncomment_iftex='s/^@c _texi2dvi\(@c _texi2dvi\)*//'


# run_makeinfo ()
# ---------------
# Expand macro commands in the original source file using Makeinfo.
# Always use `end' footnote style, since the `separate' style
# generates different output (arguably this is a bug in -E).  Discard
# main info output, the user asked to run TeX, not makeinfo.
run_makeinfo ()
{
  test $in_lang = texinfo \
    || return 0

  # Unless required by the user, makeinfo expansion is wanted only
  # if texinfo.tex is too old.
  if $expand; then
    makeinfo=${MAKEINFO:-makeinfo}
  else
    # Check if texinfo.tex performs macro expansion by looking for
    # its version.  The version is a date of the form YEAR-MO-DA.
    # We don't need to use [0-9] to match the digits since anyway
    # the comparison with $txiprereq, a number, will fail with non-digits.
    # Run in a temporary directory to avoid leaving files.
    version_test_dir=$t2ddir/version_test
    ensure_dir "$version_test_dir"
    if (
       cd "$version_test_dir"
       echo '\input texinfo.tex @bye' >txiversion.tex
       # Be sure that if tex wants to fail, it is not interactive:
       # close stdin.
       $TEX txiversion.tex </dev/null >txiversion.out 2>txiversion.err
    ); then :; else
      report "texinfo.tex appears to be broken:"
      cat "$version_test_dir/txiversion.out"
      cat "$version_test_dir/txiversion.err" >&2
      error 1 "quitting."
    fi
    eval `sed -n 's/^.*\[\(.*\)version \(....\)-\(..\)-\(..\).*$/txiformat=\1 txiversion="\2\3\4"/p' "$version_test_dir/txiversion.out"`
    verbose "texinfo.tex preloaded as \`$txiformat', version is \`$txiversion' ..."
    if test "$txiprereq" -le "$txiversion" >&6 2>&1; then
      makeinfo=
    else
      makeinfo=${MAKEINFO:-makeinfo}
    fi
    # If TeX is preloaded, offer the user this convenience:
    if test "$txiformat" = Texinfo; then
      escape=@
    fi
  fi

  if test -n "$makeinfo"; then
    # in_src: the file with macros expanded.
    # Use the same basename to generate the same aux file names.
    work_src=$workdir/src
    ensure_dir "$work_src"
    in_src=$work_src/$in_base
    local miincludes
    miincludes=`list_prefix includes -I`
    verbose "Macro-expanding $command_line_filename to $in_src ..."
    # eval $makeinfo because it might be defined as something complex
    # (running missing) and then we end up with things like '"-I"',
    # and "-I" (including the quotes) is not an option name.  This
    # happens with gettext 0.14.5, at least.
    sed "$comment_iftex" "$command_line_filename" \
      | eval $makeinfo --footnote-style=end -I "$in_dir" $miincludes \
        -o /dev/null --macro-expand=- \
      | sed "$uncomment_iftex" >"$in_src"
    # Continue only if everything succeeded.
    if test $? -ne 0 \
       || test ! -r "$in_src"; then
      verbose "Expansion failed, ignored...";
    else
      in_input=$in_src
    fi
  fi
}

# insert_commands ()
# ------------------
# Used most commonly for @finalout, @smallbook, etc.
insert_commands ()
{
  if test -n "$textra"; then
    # _xtr.  The file with the user's extra commands.
    work_xtr=$workdir/xtr
    in_xtr=$work_xtr/$in_base
    ensure_dir "$work_xtr"
    verbose "Inserting extra commands: $textra"
    local textra_cmd
    case $in_lang in
      latex)   textra_cmd=1i;;
      texinfo) textra_cmd='/^@setfilename/a';;
      *)       error 1 "internal error, unknown language: $in_lang";;
    esac
    sed "$textra_cmd\\
$textra" "$in_input" >"$in_xtr"
    in_input=$in_xtr
  fi

  case $in_lang:$latex2html:`out_lang_tex` in
    latex:tex4ht:html)
      # _tex4ht.  The file with the added \usepackage{tex4ht}.
      work_tex4ht=$workdir/tex4ht
      in_tex4ht=$work_tex4ht/$in_base
      ensure_dir "$work_tex4ht"
      verbose "Inserting \\usepackage{tex4ht}"
      perl -pe 's<\\documentclass(?:\[.*\])?{.*}>
                 <$&\\usepackage[xhtml]{tex4ht}>' \
        "$in_input" >"$in_tex4ht"
      in_input=$in_tex4ht
      ;;
  esac
}

# run_recode ()
# -------------
# If this is a Texinfo file with a specified input encoding, and
# recode is available, then recode to plain 7 bit Texinfo.
run_recode ()
{
  local from
  local to

  if test $in_lang = texinfo; then
    pgm='s/^ *@documentencoding  *\([^ ][^ ]*\) *$/\1/
        t found
        d
        :found
        q'
    encoding=`sed -e "$pgm" "$in_input"`
    if $recode && test -n "$encoding" && findprog recode; then
      if test -n "$recode_from"; then
        from=$recode_from
        to=$encoding
      else
        from=$encoding
        to=$texinfo
      fi
      verbose "Recoding from $from to $to."
      # _rcd.  The Texinfo file recoded in 7bit.
      work_rcd=$workdir/recode
      in_rcd=$work_rcd/$in_base
      ensure_dir "$work_rcd"
      if recode "$encoding..$to" <"$in_input" >"$in_rcd" \
         && test -s "$in_rcd"; then
        in_input=$in_rcd
      else
        verbose "Recoding failed, using original input."
      fi
    fi
  fi
}

# compute_language FILENAME
# -------------------------
# Return the short string describing the language in which FILENAME
# is written: `texinfo' or `latex'.
compute_language ()
{
  # If the user explicitly specified the language, use that.
  # Otherwise, if the first line is \input texinfo, assume it's texinfo.
  # Otherwise, guess from the file extension.
  if test -n "$set_language"; then
    echo $set_language
  elif sed 1q "$1" | grep 'input texinfo' >&6; then
    echo texinfo
  else
    # Get the type of the file (latex or texinfo) from the given language
    # we just guessed, or from the file extension if not set yet.
    case $1 in
      *.ltx | *.tex | *.drv | *.dtx) echo latex;;
      *)                             echo texinfo;;
    esac
  fi
}


# run_hevea (MODE)
# ----------------
# Convert to HTML/INFO/TEXT.
#
# Don't pass `-noiso' to hevea: it's useless in HTML since anyway the
# charset is set to latin1, and troublesome in other modes since
# accented characters loose their accents.
#
# Don't pass `-o DEST' to hevea because in that case it leaves all its
# auxiliary files there too...  Too bad, because it means we will need
# to handle images some day.
run_hevea ()
{
  local hevea="${HEVEA:-hevea}"
  local run_hevea="$hevea"

  case $1 in
    html) ;;
    text|info) run_hevea="$run_hevea -$1";;
    *) error 1 "run_hevea: invalid argument: $1";;
  esac

  # Compiling to the tmp directory enables to preserve a previous
  # successful compilation.
  run_hevea="$run_hevea -fix -O -o '$out_base'"
  run_hevea="$run_hevea `list_prefix includes -I` -I '$orig_pwd' "
  run_hevea="$run_hevea '$in_input'"

  if $debug; then
    run_hevea="$run_hevea -v -v"
  fi

  verbose "running $run_hevea"
  if eval "$run_hevea" >&5; then
    # hevea leaves trailing white spaces, this is annoying.
    case $1 in text|info)
      perl -pi -e 's/[ \t]+$//g' "$out_base"*;;
    esac
    case $1 in
    html|text) move_to_dest "$out_base";;
    info) # There can be foo.info-1, foo.info-2 etc.
               move_to_dest "$out_base"*;;
    esac
  else
    error 1 "$hevea exited with bad status, quitting."
  fi
}


# run_core_conversion ()
# ----------------------
# Run the TeX (or HeVeA).
run_core_conversion ()
{
  case $in_lang:$latex2html:`out_lang_tex` in
    *:dvi|*:pdf|latex:tex4ht:html)
        run_tex;;
    latex:*:html|latex:*:text|latex:*:info)
        run_hevea $out_lang;;
    *)
        error 1 "invalid input/output combination: $in_lang/$out_lang";;
  esac
}


# compile ()
# ----------
# Run the full compilation chain, from pre-processing to installation
# of the output at its expected location.
compile ()
{
  # Source file might include additional sources.
  # We want `.:$orig_pwd' before anything else.  (We'll add `.:' later
  # after all other directories have been turned into absolute paths.)
  # `.' goes first to ensure that any old .aux, .cps,
  # etc. files in ${directory} don't get used in preference to fresher
  # files in `.'.  Include orig_pwd in case we are in clean build mode, where
  # we have cd'd to a temp directory.
  common="$orig_pwd$path_sep$in_dir$path_sep"
  #
  # If we have any includes, put those at the end.
  # Keep a final path_sep to get the default (system) TeX directories included.
  txincludes=`list_infix includes $path_sep`
  test -n "$txincludes" && common="$common$txincludes$path_sep"
  #
  for var in $tex_envvars; do
    eval val="\$common\$${var}_orig"
    # Convert relative paths to absolute paths, so we can run in another
    # directory (e.g., in clean build mode, or during the macro-support
    # detection). ".:" is added here.
    val=`absolute_filenames "$val"`
    eval $var="\"$val\""
    export $var
    eval verbose \"$var=\'\$${var}\'\"
  done

  # --expand
  run_makeinfo

  # --command, --texinfo
  insert_commands

  # --recode
  run_recode

  # Run until a fix point is reached.
  run_tex_suite
}


# remove FILES
# ------------
remove ()
{
  verbose "Removing" "$@"
  rm -rf "$@"
}


# mostly_clean
# ------------
# Remove auxiliary files and directories.  Changes the current directory.
mostly_clean ()
{
  cd_orig
  set X "$t2ddir"
  shift
  $tidy || {
    local log="$work_build/$in_noext.log"
    set X ${1+"$@"} "$log" `generated_files_get "$work_build/$in_noext"`
    shift
  }
  remove ${1+"$@"}
}


# cleanup ()
# ----------
# Remove what should be removed according to options.
# Called at the end of each compilation cycle, and at the end of
# the script.  Changes the current directory.
cleanup ()
{
  case $build_mode in
    local) cd_orig; remove "$t2ddir";;
    clean) mostly_clean;;
    tidy)  ;;
  esac
}



## ---------------------- ##
## Command line parsing.  ##
## ---------------------- ##

# Push a token among the arguments that will be used to notice when we
# ended options/arguments parsing.
# Use "set dummy ...; shift" rather than 'set - ..." because on
# Solaris set - turns off set -x (but keeps set -e).
# Use ${1+"$@"} rather than "$@" because Digital Unix and Ultrix 4.3
# still expand "$@" to a single argument (the empty string) rather
# than nothing at all.
arg_sep="$$--$$"
set dummy ${1+"$@"} "$arg_sep"; shift

# 
# Parse command line arguments.
while test x"$1" != x"$arg_sep"; do

  # Handle --option=value by splitting apart and putting back on argv.
  case "$1" in
    --*=*)
      opt=`echo "$1" | sed -e 's/=.*//'`
      val=`echo "$1" | sed -e 's/[^=]*=//'`
      shift
      set dummy "$opt" "$val" ${1+"$@"}; shift
      ;;
  esac

  # This recognizes --quark as --quiet.  Oh well.
  case "$1" in
    -@ ) escape=@;;
    -~ ) catcode_special=false;;
    # Silently and without documentation accept -b and --b[atch] as synonyms.
    -b | --batch) batch=true;;
         --build)      shift; build_mode=$1;;
         --build-dir)  shift; build_dir=$1; build_mode=tidy;;
    -c | --clean) build_mode=clean;;
    -D | --debug) debug=true;;
    -e | -E | --expand) expand=true;;
    -h | --help) usage;;
    -I)   shift; list_concat_dirs includes "$1";;
    -l | --lang | --language) shift; set_language=$1;;
    --mostly-clean) action=mostly-clean;;
    --no-line-error) line_error=false;;
    --max-iterations) shift; max_iters=$1;;
    -o | --out  | --output)
      shift
      # Make it absolute, just in case we also have --clean, or whatever.
      oname=`absolute "$1"`;;

    # Output formats.
    -O|--output-format) shift; out_lang_set "$1";;
       --dvi|--dvipdf|--html|--info|--pdf|--ps|--text)
       out_lang_set `echo "x$1" | sed 's/^x--//'`;;

    -p) out_lang_set pdf;;
    -q | -s | --quiet | --silent) quiet=true; batch=true;;
    -r | --recode) recode=true;;
    --recode-from) shift; recode=true; recode_from="$1";;
    --src-specials) src_specials=--src-specials;;
    --shell-escape) shell_escape=--shell-escape;;  
    --tex4ht) latex2html=tex4ht;;
    -t | --texinfo | --command ) shift; textra="$textra\\
"`echo "$1" | sed 's/\\\\/\\\\\\\\/g'`;;
    --translate-file ) shift; translate_file="$1";;
    --tidy) build_mode=tidy;;
    -v | --vers*) version;;
    -V | --verb*) verb=true;;
    --) # What remains are not options.
      shift
      while test x"$1" != x"$arg_sep"; do
        set dummy ${1+"$@"} "$1"; shift
        shift
      done
      break;;
    -*)
      error 1 "Unknown or ambiguous option \`$1'." \
              "Try \`--help' for more information."
      ;;
    *) set dummy ${1+"$@"} "$1"; shift;;
   esac
   shift
done
# Pop the token
shift

# $tidy:  compile in a t2d directory.
# $clean: remove all the aux files.
case $build_mode in
  local) clean=false; tidy=false;;
  tidy)  clean=false; tidy=true;;
  clean) clean=true;  tidy=true;;
      *) error 1 "invalid build mode: $build_mode";;
esac

# Interpret remaining command line args as filenames.
case $# in
 0)
  error 2 "Missing file arguments." "Try \`--help' for more information."
  ;;
 1) ;;
 *)
  if test -n "$oname"; then
    error 2 "Can't use option \`--output' with more than one argument."
  fi
  ;;
esac


# We can't do much without tex.
#
if findprog ${TEX:-tex}; then :; else cat <<EOM
You don't have a working TeX binary (${TEX:-tex}) installed anywhere in
your PATH, and texi2dvi cannot proceed without one.  If you want to use
this script, you'll need to install TeX (if you don't have it) or change
your PATH or TEX environment variable (if you do).  See the --help
output for more details.

For information about obtaining TeX, please see http://www.tug.org.  If
you happen to be using Debian, you can get it with this command:
  apt-get install tetex-bin
EOM
  exit 1
fi


# We want to use etex (or pdftex) if they are available, and the user
# didn't explicitly specify.  We don't check for elatex and pdfelatex
# because (as of 2003), the LaTeX team has asked that new distributions
# use etex by default anyway.
#
# End up with the TEX and PDFTEX variables set to what we are going to use.
if test -z "$TEX"; then
  if findprog etex; then TEX=etex; else TEX=tex; fi
fi
#
if test -z "$PDFTEX"; then
  if findprog pdfetex; then PDFTEX=pdfetex; else PDFTEX=pdftex; fi
fi


# File descriptor usage:
# 0 standard input
# 1 standard output (--verbose messages)
# 2 standard error
# 3 some systems may open it to /dev/tty
# 4 used on the Kubota Titan
# 5 tools output (turned off by --quiet)
# 6 tracing/debugging (set -x output, etc.)


# Main tools' output (TeX, etc.) that TeX users are used to seeing.
#
# If quiet, discard, else redirect to the message flow.
if $quiet; then
  exec 5>/dev/null
else
  exec 5>&1
fi


# Enable tracing, and auxiliary tools output.
# 
# This fd should be used where you'd typically use /dev/null to throw
# output away.  But sometimes it is convenient to see that output (e.g.,
# from a grep) to aid debugging.  Especially debugging at distance, via
# the user.
# 
if $debug; then
  exec 6>&1
  set -vx
else
  exec 6>/dev/null
fi

# 

# input_file_name_decode
# ----------------------
# Decode COMMAND_LINE_FILENAME, and compute:
# - COMMAND_LINE_FILENAME clean of TeX commands
# - IN_DIR
#   The directory to the input file, possibly absolute if needed.
# - IN_DIR_ABS
#   The absolute directory of the input file.
# - IN_BASE
#   The input file base name (no directory part).
# - IN_NOEXT
#   The input file name without extensions (nor directory part).
# - IN_INPUT
#   Defaults to COMMAND_LINE_FILENAME, but might change if the
#   input is preprocessed (recode etc.).  With directory, possibly absolute.
input_file_name_decode ()
{
  # See if we are run from within AUC-Tex, in which case we are
  # passed `\input{FOO.tex}' or even `\nonstopmode\input{FOO.tex}'.
  case $command_line_filename in
    *\\nonstopmode*)
      batch=true;;
  esac
  case $command_line_filename in
    *\\input{*}*)
      # Let AUC-TeX error parser deal with line numbers.
      line_error=false
      command_line_filename=`\
        expr X"$command_line_filename" : X'.*input{\([^}]*\)}'`
      ;;
  esac

  # If the COMMAND_LINE_FILENAME is not absolute (e.g., --debug.tex),
  # prepend `./' in order to avoid that the tools take it as an option.
  echo "$command_line_filename" | LC_ALL=C $EGREP '^(/|[A-Za-z]:/)' >&6 \
  || command_line_filename="./$command_line_filename"

  # See if the file exists.  If it doesn't we're in trouble since, even
  # though the user may be able to reenter a valid filename at the tex
  # prompt (assuming they're attending the terminal), this script won't
  # be able to find the right xref files and so forth.
  test -r "$command_line_filename" \
  || error 1 "cannot read $command_line_filename, skipping."

  # Get the name of the current directory.
  in_dir=`func_dirname "$command_line_filename"`
  in_dir_abs=`absolute "$in_dir"`
  # In a clean build, we `cd', so get an absolute file name.
  if $tidy; then
    in_dir=$in_dir_abs
  fi

  # Strip directory part but leave extension.
  in_base=`basename "$command_line_filename"`
  # Strip extension.
  in_noext=`noext "$in_base"`

  # The normalized file name to compile.  Must always point to the
  # file to actually compile (in case of recoding, macro-expansion etc.).
  in_input=$in_dir/$in_base


  # Compute the output file name.
  if test x"$oname" != x; then
    out_name=$oname
  else
    out_name=$in_noext.`out_lang_ext`
  fi
  out_dir=`func_dirname "$out_name"`
  out_dir_abs=`absolute "$out_dir"`
  out_base=`basename "$out_name"`
  out_noext=`noext "$out_base"`
}


## -------------- ##
## TeXify files.  ##
## -------------- ##

for command_line_filename
do
  verbose "Processing $command_line_filename ..."

  input_file_name_decode

  # `texinfo' or `latex'?
  in_lang=`compute_language "$command_line_filename"`

  # An auxiliary directory used for all the auxiliary tasks involved
  # in compiling this document.
  case $build_dir in
      '' | . ) t2ddir=$out_noext.t2d ;;
      *) # Avoid collisions between multiple occurrences of the same
         # file, so depend on the output path.  Remove leading `./',
         # at least to avoid creating a file starting with `.!', i.e.,
         # an invisible file. The sed expression is fragile if the cwd
         # has active characters.  Transform / into ! so that we don't
         # need `mkdir -p'.  It might be something to reconsider.
         t2ddir=$build_dir/`echo "$out_dir_abs/$out_noext.t2d" |
             sed "s,^$orig_pwd/,,;s,^\./,,;s,/,!,g"`
  esac
  # Remove it at exit if clean mode.
  trap "cleanup" 0 1 2 15

  ensure_dir "$build_dir" "$t2ddir"

  # We will change directory, better work with an absolute path...
  t2ddir=`absolute "$t2ddir"`
  # Sometimes there are incompatibilities between auxiliary files for
  # DVI and PDF.  The contents can also change whether we work on PDF
  # and/or DVI.  So keep separate spaces for each.
  workdir=$t2ddir/`out_lang_tex`
  ensure_dir "$workdir"

  # _build.  In a tidy build, where the auxiliary files are output.
  if $tidy; then
    work_build=$workdir/build
  else
    work_build=.
  fi

  # _bak.  Copies of the previous auxiliary files (another round is
  # run if they differ from the new ones).
  work_bak=$workdir/bak

  # Make those directories.
  ensure_dir "$work_build" "$work_bak"

  case $action in
    compile)
      # Compile the document.
      compile
      cleanup
      ;;

    mostly-clean)
      mostly_clean
      ;;
  esac
done

verbose "done."
exit 0 # exit successfully, not however we ended the loop.