summaryrefslogtreecommitdiff
path: root/Master/tlpkg/TeXLive/TLWinGoo.pm
blob: a922fca9c161304d39f5538e0bd1796cbf78dbe5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
# $Id$
# TeXLive::TLWinGoo.pm - Windows nastiness
# Copyright 2008-2013 Siep Kroonenberg, Norbert Preining
# This file is licensed under the GNU General Public License version 2
# or any later version.

# code for broadcast_env adapted from Win32::Env:
# Copyright 2006 Oleg "Rowaa[SR13]" V. Volkov, all rights reserved.
# This program is free software; you can redistribute it and/or modify it
# under the same terms as Perl itself.

package TeXLive::TLWinGoo;

my $svnrev = '$Revision$';
my $_modulerevision;
if ($svnrev =~ m/: ([0-9]+) /) {
  $_modulerevision = $1;
} else {
  $_modulerevision = "unknown";
}
sub module_revision {
  return $_modulerevision;
}

=pod

=head1 NAME

C<TeXLive::TLWinGoo> -- Additional utilities for Windows

=head2 SYNOPSIS

  use TeXLive::TLWinGoo;

=head2 DIAGNOSTICS

  TeXLive::TLWinGoo::win_version;
  TeXLive::TLWinGoo::is_vista;
  TeXLive::TLWinGoo::admin;
  TeXLive::TLWinGoo::non_admin;
  TeXLive::TLWinGoo::reg_country;

=head2 ENVIRONMENT AND REGISTRY

  TeXLive::TLWinGoo::expand_string($s);
  TeXLive::TLWinGoo::global_tmpdir;
  TeXLive::TLWinGoo::get_system_path;
  TeXLive::TLWinGoo::get_user_path;
  TeXLive::TLWinGoo::setenv_reg($env_var, $env_data);
  TeXLive::TLWinGoo::unsetenv_reg($env_var);
  TeXLive::TLWinGoo::adjust_reg_path_for_texlive($action, $texbindir, $mode);
  TeXLive::TLWinGoo::add_to_progids($ext, $filetype);
  TeXLive::TLWinGoo::remove_from_progids($ext, $filetype);
  TeXLive::TLWinGoo::register_extension($mode, $extension, $file_type);
  TeXLive::TLWinGoo::unregister_extension($mode, $extension);
  TeXLive::TLWinGoo::register_file_type($file_type, $command);
  TeXLive::TLWinGoo::unregister_file_type($file_type);

=head2 ACTIVATING CHANGES IMMEDIATELY

  TeXLive::TLWinGoo::broadcast_env;
  TeXLive::TLWinGoo::update_assocs;

=head2 SHORTCUTS

  TeXLive::TLWinGoo::desktop_path;
  TeXLive::TLWinGoo::add_desktop_shortcut($texdir, $name, $icon,
    $prog, $args, $batgui);
  TeXLive::TLWinGoo::add_menu_shortcut($place, $name, $icon,
    $prog, $args, $batgui);
  TeXLive::TLWinGoo::remove_desktop_shortcut($name);
  TeXLive::TLWinGoo::remove_menu_shortcut($place, $name);

=head2 UNINSTALLER

  TeXLive::TLWinGoo::create_uninstaller;
  TeXLive::TLWinGoo::unregister_uninstaller;

All exported functions return forward slashes.

=head2 DESCRIPTION

=over 4

=cut

BEGIN {
  use Exporter;
  use vars qw( @ISA @EXPORT $Registry);
  @ISA = qw( Exporter );
  @EXPORT = qw(
    &win_version
    &is_vista
    &admin
    &non_admin
    &reg_country
    &expand_string
    &global_tmpdir
    &get_system_path
    &get_user_path
    &setenv_reg
    &unsetenv_reg
    &adjust_reg_path_for_texlive
    &add_to_progids
    &remove_from_progids
    &register_extension
    &unregister_extension
    &register_file_type
    &unregister_file_type
    &broadcast_env
    &update_assocs
    &shell_folder
    &desktop_path
    &add_desktop_shortcut
    &add_menu_shortcut
    &remove_desktop_shortcut
    &remove_menu_shortcut
    &create_uninstaller
    &unregister_uninstaller
  );
  # for testing also:
  @EXPORT_OK = qw(
    &admin_again
    &get_system_env
    &get_user_env
    &global_tmpdir
    &is_a_texdir
    &tex_dirs_on_path
  );
  if ($^O=~/^MSWin(32|64)$/i) {
    require Win32::API;
    require Win32::TieRegistry;
    Win32::TieRegistry->import( qw( $Registry
      REG_SZ REG_EXPAND_SZ REG_NONE KEY_READ KEY_WRITE KEY_ALL_ACCESS
         KEY_ENUMERATE_SUB_KEYS ) );
    $Registry->Delimiter('/');
    $Registry->ArrayValues(0);
    $Registry->FixSzNulls(1);
    require Win32::Shortcut;
    Win32::Shortcut->import( qw( SW_SHOWNORMAL SW_SHOWMINNOACTIVE ) );
    require Time::HiRes;
  }
}

use TeXLive::TLConfig;
use TeXLive::TLUtils;
TeXLive::TLUtils->import( qw( mkdirhier ) );

sub reg_debug {
  return if ($::opt_verbosity < 1);
  my $mess = shift;
  my $regerr = Win32API::Registry::regLastError();
  if ($regerr) {
    debug("$regerr\n$mess");
  }
}

my $is_win = $^O=~/^MSWin(32|64)$/i;

=pod

=back

=head2 DIAGNOSTICS

=over 4

=item C<win_version>

C<win_version> returns the Windows version number as stored in the
registry: 5.0 for Windows 2000, 5.1 for Windows XP and 6.0 for Vista.

=cut

my $windows_version = 0;

if ($is_win) {
  my $tempkey = $Registry->Open(
    "LMachine/software/Microsoft/Windows NT/CurrentVersion/",
    {Access => KEY_READ() });
  $windows_version = $tempkey -> { "/CurrentVersion" };
}

sub win_version { return $windows_version; }

=item C<is_vista>

C<is_vista> returns 1 if win_version is >= 6.0, otherwise 0.

=cut

sub is_vista { return $windows_version >= 6; }

# permissions with which we try to access the system environment

my $is_admin = 1;

sub sys_access_permissions {
  $is_admin ? KEY_ALL_ACCESS() : KEY_READ() | KEY_ENUMERATE_SUB_KEYS();
}

sub get_system_env {
  return $Registry -> Open(
    "LMachine/system/currentcontrolset/control/session manager/Environment/",
    {Access => sys_access_permissions()});
}

# $is_admin was set to true originally. With this value,
# sys-access_permissions returns full access permissions. If that
# doesn't work out then apparently we aren't administrator, so we
# set $is_admin to 0.

if ($is_win) {
  $is_admin = 0 if not get_system_env();
  debug("Configuring TLWinGoo for " .
    ($is_admin ? "admin" : "user") . "mode\n") if win32();
}

sub get_user_env {
  return $Registry -> Open("CUser/Environment", {Access => KEY_ALL_ACCESS()});
}

=pod

=item C<admin>

Returns admin status, admin implying having full read-write access
to the system environment.

=cut

sub admin { return $is_admin; }

=pod

=item C<non_admin>

Pretend not to have admin privileges, to enforce a user- rather than
a system install.

Currently only used for testing.

=cut

sub non_admin {
  debug("TLWinGoo: switching to user mode\n");
  $is_admin = 0;
}

# just for testing; doesn't check actual user permissions
sub admin_again {
  debug("TLWinGoo: switching to admin mode\n");
  $is_admin = 1;
}

=pod

=item C<reg_country>

Two-letter country code representing the locale of the current user

=cut

sub reg_country {
  my $value = $Registry -> {"CUser/Control Panel/International//Locale"};
  return unless $value;
  # there might be trailing nulls on Vista
  $value =~ s/\x00*$//;
  $value = substr $value, -4;
  return unless $value;
  my $lmkey = $Registry -> Open("HKEY_CLASSES_ROOT/MIME/Database/Rfc1766/",
                             {Access => KEY_READ()});
  return unless $lmkey;
  $lm = $lmkey->{"/$value"};
  return unless $lm;
  debug("found lang codes value = $value, lm = $lm...\n");
  if ($lm) {
    if ($lm =~ m/^zh-(tw|hk)$/i) {
      return ("zh", "tw");
    } elsif ($lm =~ m/^zh/) {
      # for anything else starting with zh return, that is zh, zh-cn, zh-sg
      # and maybe something else
      return ("zh", "cn");
    } else {
      my $lang = lc(substr $lm, 0, 2);
      my $area = lc(substr $lm, 3, 2);
      return($lang, $area);
    }
  }
}


=pod

=back

=head2 ENVIRONMENT AND REGISTRY

Most settings can be made for a user and for the system. User
settings override system settings.

For admin users, the functions below affect both user- and system
settings. For non-admin users, only user settings are changed.

An exception is the search path: the effective searchpath consists
of the system searchpath in front concatenated with the user
searchpath at the back.

Note that in a roaming profile network setup, users take only user
settings with them to other systems, not system settings. In this
case, with a TeXLive on the network, a nonadmin install makes the
most sense.

=over 4

=item C<expand_string($s)>

This function replaces substrings C<%env_var%> with their current
values as environment variable and returns the result.

=cut

sub expand_string {
  my ($s) = @_;
  $s =~ s/%([^%;]+)%/$ENV{$1} ? $ENV{$1} : "%$1%"/eg;
  return $s;
}

=pod

=item C<global_tmpdir>

Returns the expanded value of C<%TEMP%> from the system environment,
usually C<%SystemRoot%/Temp>. This value is normally not available
from C<%ENV>.

=cut

if ($is_win) {
  $global_tmp = expand_string(get_system_env()->{'TEMP'}) if $is_win;
}

my $global_tmp = "/tmp";

sub global_tmpdir { return $global_tmp; }

sub is_a_texdir {
  my $d = shift;
  $d =~ s/\\/\//g;
  $d = $d . '/' unless $d =~ m!/$!;
  # don't consider anything under %systemroot% a texdir
  my $sr = uc($ENV{'SystemRoot'});
  $sr =~ s/\\/\//g;
  $sr = $sr . '/' unless $sr =~ m!/$!;
  return 0 if index($d, $sr)==0;
  foreach $p (qw(luatex.exe mktexlsr.exe pdftex.exe tex.exe xetex.exe)) {
    return 1 if (-e $d.$p);
  }
  return 0;
}

=pod

=item C<get_system_path>

Returns unexpanded system path, as stored in the registry, but with
forward slashes.

=cut

sub get_system_path {
  my $value = get_system_env() -> {'/Path'};
  # Remove terminating zero bytes; there may be several, at least
  # under w2k, and the FixSzNulls option only removes one.
  $value =~ s/[\s\x00]+$//;
  return $value;
}

=pod

=item C<get_user_path>

Returns unexpanded user path, as stored in the registry, but with
forward slashes. The user path often does not exist, and is rarely
expandable.

=cut

sub get_user_path {
  my $value = get_user_env() -> {'/Path'};
  return "" if not $value;
  $value =~ s/[\s\x00]+$//;
  return $value;
}

#=pod
#
#=item C<win_which_dir>
#
#More or less the same as which, except that 1. it returns a
#directory, 2. it consults the path stored in the registry rather
#than the path of the current process, and 3. it assumes that the
#filename includes an extension. Currently only used for testing.
#
#=cut
#
#sub win_which_dir {
#  my $prog = shift;
#  my $d;
#  # first check system path
#  my $path = expand_string(get_system_path());
#  my $user_path = expand_string(get_user_path());
#  $path = $path . ';' . $user_path if $user_path;
#  $path =~ s/\\/\//g;
#  foreach $d (split (';',$path)) {
#    $d =~ s/\/$//;
#    return $d if -e $d.'/'.$prog;
#  }
#  return 0;
#}

=pod

=item C<setenv_reg($env_var, $env_data[, $mode]);>

Set an environment variable $env_var to $env_data.

$mode="user": set for current user. $mode="system": set for all
users. Default: both if admin, current user otherwise.

=cut

sub setenv_reg {
  my $env_var = shift;
  my $env_data = shift;
  my $mode = @_ ? shift : "default";
  die "setenv_reg: Invalid mode $mode"
    if ($mode ne "user" and $mode ne "system" and $mode ne "default");
  die "setenv_reg: mode 'system' only available for admin"
    if ($mode eq "system" and !$is_admin);
  my $env;
  if ($mode ne "system") {
    $env = get_user_env();
    $env->ArrayValues(1);
    $env->{'/'.$env_var} =
       [ $env_data, ($env_data =~ /%/) ? REG_EXPAND_SZ : REG_SZ ];
  }
  if ($mode ne "user" and $is_admin) {
    $env = get_system_env();
    $env->ArrayValues(1);
    $env->{'/'.$env_var} =
       [ $env_data, ($env_data =~ /%/) ? REG_EXPAND_SZ : REG_SZ ];
  }
}

=pod

=item C<unsetenv_reg($env_var[, $mode]);>

Unset an environment variable $env_var

=cut

sub unsetenv_reg {
  my $env_var = shift;
  my $env = get_user_env();
  my $mode = @_ ? shift : "default";
  #print "Unsetenv_reg: unset $env_var with mode $mode\n";
  die "unsetenv_reg: Invalid mode $mode"
    if ($mode ne "user" and $mode ne "system" and $mode ne "default");
  die "unsetenv_reg: mode 'system' only available for admin"
    if ($mode eq "system" and !$is_admin);
  delete get_user_env()->{'/'.$env_var} if $mode ne "system";
  delete get_system_env()->{'/'.$env_var} if ($mode ne "user" and $is_admin);
}

=pod

=item C<tex_dirs_on_path($path)>

Returns tex directories found on the search path.
A directory is a TeX directory if it contains tex.exe or
pdftex.exe.

=cut

sub tex_dirs_on_path {
  my ($path) = @_;
  my ($d, $d_exp);
  my @texdirs = ();
  foreach $d (split (';', $path)) {
    $d_exp = expand_string($d);
    if (is_a_texdir($d_exp)) {
      # tlwarn("Possibly conflicting [pdf]TeX program found at $d_exp\n");
      push(@texdirs, $d_exp);
    };
  }
  return @texdirs;
}

=pod

=item C<adjust_reg_path_for_texlive($action, $tlbindir, $mode)>

Edit system or user PATH variable in the registry.
Adds or removes (depending on $action) $tlbindir directory
to system or user PATH variable in the registry (depending on $mode).

=cut

sub adjust_reg_path_for_texlive {
  my ($action, $tlbindir, $mode) = @_;
  die("Unknown path action: $action\n")
    if ($action ne 'add') && ($action ne 'remove');
  die("Unknown path mode: $mode\n")
    if ($mode ne 'system') && ($mode ne 'user');
  debug("Warning: [pdf]tex program not found in $tlbindir\n")
    if (!is_a_texdir($tlbindir));
  my $path = ($mode eq 'system') ? get_system_path() : get_user_path();
  $tlbindir =~ s!/!\\!g;
  my $tlbindir_short = uc(short_name($tlbindir));
  my ($d, $d_short, @newpath);
  my $tex_dir_conflict = 0;
  my @texdirs;
  foreach $d (split (';', $path)) {
    $d_short = uc(short_name(expand_string($d)));
    $d_short =~ s!/!\\!g;
    ddebug("adjust_reg: compar $d_short with $tlbindir_short\n");
    if ($d_short ne $tlbindir_short) {
      push(@newpath, $d);
      if (is_a_texdir($d)) {
        $tex_dir_conflict++;
        push(@texdirs, $d);
      }
    }
  }
  if ($action eq 'add') {
    if ($tex_dir_conflict) {
      log("Warning: conflicting [pdf]tex program found on the $mode path ", 
          "in @texdirs; appending $tlbindir to the front of the path.\n");
      unshift(@newpath, $tlbindir);
    } else {
      push(@newpath, $tlbindir);
    }
  }
  if (@newpath) {
    debug("TLWinGoo: adjust_reg_path_for_texlive: calling setenv_reg in $mode\n");
    setenv_reg("Path", join(';', @newpath), $mode);
  } else {
    debug("TLWinGoo: adjust_reg_path_for_texlive: calling unsetenv_reg in $mode\n");
    unsetenv_reg("Path", $mode);
  }
  if ( ($action eq 'add') && ($mode eq 'user') ) {
    @texdirs = tex_dirs_on_path( get_system_path() );
    return 0 unless (@texdirs);
    tlwarn("Warning: conflicting [pdf]tex program found on the system path ",
           "in @texdirs; not fixable in user mode.\n");
    return 1;
  }
  return 0;
}

### File types ###

# Refactored from 2010 edition. New functionality:
# add_to_progids for defining alternate filetypes for an extension.
# Their associated programs show up in the `open with' right-click menu.

### helper subs ###

# merge recursive hash refs such as occur in the registry

sub hash_merge {
  my $target = shift; # the recursive hash ref to be modified by $mods
  my $mods = shift; # the recursive hash ref to be merged into $target
  my $k;
  foreach $k (keys %$mods) {
    if (ref($target->{$k}) eq 'HASH' and ref($mods->{$k}) eq 'HASH') {
      hash_merge($target->{$k}, $mods->{$k});
    } else {
      $target->{$k} = $mods->{$k};
      reg_debug ("at hash merge\n");
      $target->Flush();
      reg_debug ("at hash merge\n");
    }
  }
}

# prevent catastrophies during testing; not to be used in production code

sub getans {
  my $prompt = shift;
  my $ans;
  print STDERR "$prompt ";
  $ans = <STDIN>;
  if ($ans =~ /^y/i) {print STDERR "\n"; return 1;}
  die "Aborting as requested";
}

# delete a registry key recursively.
# the key parameter should be a string, not a registry object.

sub reg_delete_recurse {
  my $parent = shift;
  my $childname = shift;
  my $parentpath = $parent->Path;
  ddebug("Deleting $parentpath$childname\n");
  my $child;
  if ($childname !~ '^/') { # subkey
    $child = $parent->Open ($childname, {Access => KEY_ALL_ACCESS()});
    reg_debug ("at open $childname for all access\n");
    return 1 unless defined($child);
    foreach my $v (keys %$child) {
      if ($v =~ '^/') { # value
        delete $child->{$v};
        reg_debug ("at delete $childname/$v\n");
        $child->Flush();
        reg_debug ("at delete $childname/$v\n");
        Time::HiRes::usleep(20000);
      } else { # subkey
        return 0 unless reg_delete_recurse ($child, $v);
      }
    }
    #delete $child->{'/'};
  }
  delete $parent->{$childname};
  reg_debug ("at delete $parentpath$childname\n");
  $parent->Flush();
  reg_debug ("at delete $parentpath$childname\n");
  Time::HiRes::usleep(20000);
  return 1;
}

sub cu_root {
  my $k = $Registry -> Open("CUser", {
    Access => KEY_ALL_ACCESS(), Delimiter => '/'
  });
  reg_debug ("at open HKCU for all access\n");
  die "Cannot open HKCU for writing" unless $k;
  return $k;
}

sub lm_root {
  my $k = $Registry -> Open("LMachine", {
      Access => ($is_admin ? KEY_ALL_ACCESS() : KEY_READ()),
      Delimiter => '/'
  });
  reg_debug ("at open HKLM\n");
  die "Cannot open HKLM for ".($is_admin ? "writing" : "reading")
      unless $k;
  return $k;
}

sub do_write_regkey {
  my $keypath = shift; # modulo cu/lm
  my $keyhash = shift; # ref to a possibly nested hash; empty hash allowed
  my $remove_cu = shift;
  die "No regkey specified" unless $keypath && defined($keyhash);
  # for error reporting:
  my $hivename = $is_admin ? 'HKLM' : 'HKCU';

  # split into parent and final subkey
  # remove initial slash from parent
  # ensure subkey ends with slash
  my ($parentpath, $keyname);
  if ($keypath =~ /^\/?(.+\/)([^\/]+)\/?$/) {
    ($parentpath, $keyname) = ($1, $2);
    $keyname .= '/';
    debug ("key - $hivename - $parentpath - $keyname\n");
  } else {
    die "Cannot determine final component of $keypath";
  }

  my $cu_key = cu_root();
  my $lm_key = lm_root();
  # cu_root() and lm_root() already die upon failure
  my $parentkey;

  # make sure parent exists
  if ($is_admin) {
    $parentkey = $lm_key->Open($parentpath);
    reg_debug ("at open $parentpath; creating...\n");
    if (!$parentkey) {
      # in most cases, this probably shouldn't happen for lm
      $parentkey = $lm_key->CreateKey($parentpath);
      reg_debug ("at creating $parentpath\n");
    }
  } else {
    $parentkey = $cu_key->Open($parentpath);
    reg_debug ("at open $parentpath; creating...\n");
    if (!$parentkey) {
      $parentkey = $cu_key->CreateKey($parentpath);
      reg_debug ("at creating $parentpath\n");
    }
  }
  if (!$parentkey) {
    tlwarn "Cannot create parent of $hivename/$keypath\n";
    return 0;
  }

  # create or merge key
  if ($parentkey->{$keyname}) {
    hash_merge($parentkey->{$keyname}, $keyhash);
  } else {
    $parentkey->{$keyname} = $keyhash;
    reg_debug ("at creating $keyname\n");
  }
  if (!$parentkey->{$keyname}) {
    tlwarn "Failure to create $hivename/$keypath\n";
    return 0;
  }
  if ($is_admin and $cu_key->{$keypath} and $remove_cu) {
    # delete possibly conflicting cu key
    tlwarn "Failure to delete $hivename/$keypath key\n" unless
      reg_delete_recurse ($cu_key->{$parentpath}, $keyname);
  }
  return 1;
}

# remove a registry key under HKCU or HKLM, depending on privilege level

sub do_remove_regkey {
  my $keypath = shift; # key or value
  my $remove_cu = shift;
  my $hivename = $is_admin ? 'HKLM' : 'HKCU';

  my $parentpath = "";
  my $keyname = "";
  my $valname = "";
  # two successive delimiters: value.
  # *? = non-greedy match: want FIRST double delimiter
  if ($keypath =~ /^(.*?\/)(\/.*)$/) {
    ($parentpath, $valname) = ($1, $2);
    $parentpath =~ s!^/!!; # remove leading delimiter
  } elsif ($keypath =~ /^\/?(.+\/)([^\/]+)\/?$/) {
    ($parentpath, $keyname) = ($1, $2);
    $keyname .= '/';
  } else {
    die "Cannot determine final component of $keypath";
  }

  my $cu_key = cu_root();
  my $lm_key = lm_root();
  my ($parentkey, $k, $skv, $d);
  if ($is_admin) {
    $parentkey = $lm_key->Open($parentpath);
  } else {
    $parentkey = $cu_key->Open($parentpath);
  }
  reg_debug ("at opening $parentpath\n");
  if (!$parentkey) {
    debug ("$hivename/$parentpath not present or not writable".
      " so $keypath not removed\n");
    return 1;
  }
  if ($keyname) {
    #getans("Deleting $parentpath$keyname regkey? ");
    reg_delete_recurse($parentkey, $keyname);
    if ($parentkey->{$keyname}) {
      tlwarn "Failure to delete $hivename/$keypath\n";
      return 0;
    }
    if ($is_admin and $cu_key->{$parentpath}) {
      reg_delete_recurse($cu_key->{$parentpath}, $keyname);
      if ($cu_key->{$parentpath}->{$keyname}) {
        tlwarn "Failure to delete HKCU/$keypath\n";
        return 0;
      }
    }
  } else {
    delete $parentkey->{$valname};
    reg_debug ("at deleting $valname\n");
    if ($parentkey->{$valname}) {
      tlwarn "Failure to delete $hivename/$keypath\n";
      return 0;
    }
    if ($is_admin and $cu_key->{$parentpath}) {
      delete $cu_key->{$parentpath}->{$valname};
      reg_debug ("at deleting $valname\n");
      if ($cu_key->{$parentpath}->{$valname}) {
        tlwarn "Failure to delete HKCU/$keypath\n";
        return 0;
      }
    }
  }
  return 1;
}

# Effective default value of any key under Classes.
# admin: HKLM; user: HKCU or otherwise HKLM
# Reject if there is no corresponding key under classes
sub current_filetype {
  my $extension = shift;
  my $filetype;
  if ($is_admin) {
    $filetype = lm_root()->{"Software/Classes/$extension//"}; # REG_SZ
  } else {
    # Mysterious failures on w7_64 => merge HKLM/HKCU info explicitly
    # rather than checking HKCR
    $filetype = cu_root()->{"Software/Classes/$extension//"};
    if (!defined($filetype) or ($filetype eq "")) {
      $filetype = lm_root()->{"Software/Classes/$extension//"}
    };
  }
  $filetype = "" unless defined($filetype);
  return $filetype;
}

### now the exported file type functions ###

=pod

=item C<add_to_progids($ext, $filetype)>

Add $filetype to the list of alternate progids/filetypes of extension $ext.
The associated program shows up in the `open with' right-click menu.

=cut

sub add_to_progids {
  my $ext = shift;
  my $filetype = shift;
  #$Registry->ArrayValues(1);
  #do_write_regkey("Software/Classes/$ext/OpenWithProgIds/",
  #    {"/$filetype" => [0, REG_NONE()]});
  #$Registry->ArrayValues(0);
  do_write_regkey("Software/Classes/$ext/OpenWithProgIds/",
      {"/$filetype" => ""});
}

=pod

=item C<remove_from_progids($ext, $filetype)>

Remove $filetype from the list of alternate filetypes for $ext

=cut

sub remove_from_progids {
  my $ext = shift;
  my $filetype = shift;
  do_remove_regkey("Software/Classes/$ext/OpenWithProgIds//$filetype");
}

=pod

=item C<register_extension($mode, $extension, $file_type)>

Add registry entry to associate $extension with $file_type. Slashes
are flipped where necessary.

If $mode is 0, nothing is actually done.

For $mode 1, the filetype for the extension is preserved, but only
if there is a registry key under Classes for it. For $mode>0,
the new filetype is always added to the openwithprogids list.

For $mode 2, the filetype is always overwritten. The old filetype
moves to the openwithprogids list if necessary.

=cut

sub register_extension {
  my $mode = shift;
  return 1 if $mode == 0;
  my $extension = shift;
  # ensure leading dot
  $extension = '.'.$extension unless $extension =~ /^\./;
  $extension = lc($extension);
  my $file_type = shift;
  my $regkey;

  my $old_file_type = current_filetype($extension);
  if ($old_file_type) {
    if ($is_admin) {
      if (not lm_root()->{"Software/Classes/$old_file_type/"}) {
        $old_file_type = "";
      }
    } else {
      if ((not cu_root()->{"Software/Classes/$old_file_type/"}) and
          (not lm_root()->{"Software/Classes/$old_file_type/"})) {
        $old_file_type = "";
      }
    }
  }
  # admin: whether to remove HKCU entry. admin never _writes_ to HKCU
  my $remove_cu = ($mode == 2) && admin();
  # can do the following safely:
  debug ("Adding $file_type to OpenWithProgIds of $extension\n");
  add_to_progids ($extension, $file_type);
  if ($old_file_type and $old_file_type ne $file_type) {
    if ($mode == 1) {
      debug ("Not overwriting $old_file_type with $file_type for $extension\n");
    } else {
      debug("Linking $extension to $file_type\n");
      debug ("Moving $old_file_type to OpenWithProgIds\n");
      add_to_progids ($extension, $old_file_type);
      $regkey = {'/' => $file_type};
      do_write_regkey("Software/Classes/$extension/", $regkey, $remove_cu);
    }
  } else {
    $regkey = {'/' => $file_type};
    do_write_regkey("Software/Classes/$extension/", $regkey, $remove_cu);
  }
}

=pod

=item C<unregister_extension($mode, $extension, $file_type)>

Reversal of register_extension.

=cut

sub unregister_extension {
  # we don't error check; we just do the best we can.
  my $mode = shift;
  return 1 if $mode == 0;
  # mode 1 and 2 treated identically:
  # only unregister if the current value is as expected
  my $extension = shift;
  my $file_type = shift;
  $extension = '.'.$extension unless $extension =~ /^\./;
  remove_from_progids($extension, $file_type);
  my $old_file_type = current_filetype("$extension");
  if ($old_file_type ne $file_type) {
    debug("Filetype $extension now $old_file_type; not ours, so not removed\n");
    return 1;
  } else {
    debug("unregistering extension $extension\n");
    do_remove_regkey("Software/Classes/$extension//");
  }
}

=pod

=item C<register_file_type($file_type, $command)>

Add registry entries to associate $file_type with $command. Slashes
are flipped where necessary. Double quotes should be added by the
caller if necessary.

=cut

sub register_file_type {
  my $file_type = shift;
  my $command = shift;
  tlwarn "register_file_type called with empty command\n" unless $command;
  $command =~s!/!\\!g;
  debug ("Linking $file_type to $command\n");
  my $keyhash = {
    "shell/" => {
      "open/" => {
        "command/" => {
          "/" => $command
        }
      }
    }
  };
  do_write_regkey("Software/Classes/$file_type", $keyhash);
}

=pod

=item C<unregister_file_type($file_type)>

Reversal of register_file_type.

=cut

sub unregister_file_type {
  # we don't error check; we just do the best we can.
  # All our filetypes start with 'TL.' so we consider them
  # our own even if they have been tampered with.
  my $file_type = shift;
  debug ("unregistering $file_type\n");
  do_remove_regkey("Software/Classes/$file_type/");
}

=pod

=back

=head2 ACTIVATING CHANGES IMMEDIATELY

=over 4

=item C<broadcast_env>

Broadcasts system message that enviroment has changed. This only has
an effect on newly-started programs, not on running programs and the
processes they spawn.

=cut

sub broadcast_env() {
  use constant HWND_BROADCAST	=> 0xffff;
  use constant WM_SETTINGCHANGE	=> 0x001A;
  my $result = "";
  my $SendMessage;
  debug("Broadcasting \"Enviroment settings changed\" message...\n");
  #$SendMessage = new Win32::API('user32', 'SendMessage', 'LLPP', 'L');
  #$result = $SendMessage->Call(HWND_BROADCAST, WM_SETTINGCHANGE,
  #    0, 'Environment') if $SendMessage;
  $SendMessage = new Win32::API('user32', 'SendMessageTimeout', 'LLPPLLP', 'L');
  my $ans = "12345678"; # room for dword
  $result = $SendMessage->Call(HWND_BROADCAST, WM_SETTINGCHANGE,
      0, 'Environment', 0, 2000, $ans) if $SendMessage;
  debug("Broadcast complete; result: $result.\n");
}

=pod

=item C<update_assocs>

Notifies the system that filetypes have changed.

=cut

sub update_assocs() {
  use constant SHCNE_ASSOCCHANGED	=> 0x8000000;
  use constant SHCNF_IDLIST =>	0;
  my $update_fu = new Win32::API('shell32', 'SHChangeNotify', 'LIPP', 'V');
  if ($update_fu) {
    debug("Notifying changes in filetypes...\n");
    $update_fu->Call (SHCNE_ASSOCCHANGED, SHCNF_IDLIST, 0, 0);
    debug("Done notifying\n");
  } else {
    debug("No update_fu\n");
  }
}

=pod

=back

=head2 SHORTCUTS

=cut

# short path names

my $shortfu;
if ($^O=~/^MSWin(32|64)$/i) {
  $shortfu = new Win32::API('kernel32', 'GetShortPathName', 'PPN', 'N');
}

sub short_name {
  my ($fname) = @_;
  return $fname unless $is_win;
  my $buffer = (' ' x 260);
  my $slength = $shortfu->Call($fname, $buffer, 260);
  if ($slength>0) { return substr $buffer, 0, $slength; }
  else { return ''; }
}

=pod

=over 4

=item C<shell_folder>

Location of shell `special folders'; $user_name is the name
to look for in user mode, $admin_name is the name for admin mode,
e.g. `Desktop' and `Common Desktop'. The default for $admin_name is
'Common .$user_name

=cut

sub shell_folder {
  my ($user_name, $admin_name) = @_;
  $admin_name = 'Common '.$user_name unless ($admin_name or !$user_name);
  my ($shell_key, $sh_folder);
  if (admin()) {
    return 0 unless $admin_name;
    $shell_key = $Registry->Open(
    "LMachine/software/microsoft/windows/currentversion/explorer/user shell folders/",
      {Access => KEY_READ}) or return 0;
    $sh_folder = $shell_key -> {"/$admin_name"};
    $sh_folder = short_name(expand_string($sh_folder));
  } else {
    $shell_key = $Registry->Open(
    "CUser/software/microsoft/windows/currentversion/explorer/user shell folders/",
      {Access => KEY_READ}) or return 0;
    $sh_folder = $shell_key -> {"/$user_name"};
    $sh_folder = short_name(expand_string($sh_folder));
  }
  $sh_folder =~ s!\\!/!g;
  return $sh_folder;
}

sub desktop_path() {
  return shell_folder('Desktop');
}

sub menu_path() {
  return shell_folder('Programs', 'Common Programs');
}

=pod

=item C<add_desktop_shortcut($name, $icon, $prog, $args, $batgui)>

Add a desktop shortcut, with name $name and icon $icon, pointing to
program $prog with parameters $args (a string).  Use a non-null
batgui parameter if the shortcut starts a gui program via a
batchfile. Then the inevitable command prompt will be hidden
rightaway, leaving only the gui program visible.

=cut

sub add_desktop_shortcut {
  my ($name, $icon, $prog, $args, $batgui) = @_;

  # create shortcut
  my ($shc, $shpath, $shfile);
  $shc = new Win32::Shortcut();
  $shc->{'IconLocation'} = $icon if -f $icon;
  $shc->{'Path'} = $prog;
  $shc->{'Arguments'} = $args;
  $shc->{'ShowCmd'} = $batgui ? SW_SHOWMINNOACTIVE : SW_SHOWNORMAL;
  $shfile = desktop_path().'/'.$name.'.lnk';
  $shc->Save($shfile);
}

=pod

=item C<add_menu_shortcut($place, $name, $icon,
  $prog, $args, $batgui)>

Add a menu shortcut at place $place (relative to Start/Programs),
with name $name and icon $icon, pointing to program $prog with
parameters $args. See above for batgui.

=cut

sub add_menu_shortcut {
  my ($place, $name, $icon, $prog, $args, $batgui) = @_;
  $place =~ s!\\!/!g;

  my ($shc, $shpath, $shfile);
  $shc = new Win32::Shortcut();
  $shc->{'IconLocation'} = $icon if -f $icon;
  $shc->{'Path'} = $prog;
  $shc->{'Arguments'} = $args;
  $shc->{'ShowCmd'} = $batgui ? SW_SHOWMINNOACTIVE : SW_SHOWNORMAL;
  $shpath = $place;
  $shpath =~ s!\\!/!g;
  $shpath = '/'.$shpath unless $shpath =~ m!^/!;
  $shpath = menu_path().$shpath;
  if ((-e $shpath) and not (-d $shpath)) {
    next; # fail silently and don't worry about it
  } elsif (not (-d $shpath)) {
    mkdirhier($shpath);
    return unless -d $shpath;
  }
  $shfile = $shpath.'/'.$name.'.lnk';
  $shc->Save($shfile);
}

=pod

=item C<remove_desktop_shortcut($name)>

For uninstallation of an individual package.

=cut

sub remove_desktop_shortcut {
  my $name = shift;
  unlink desktop_path().'/'.$name.'.lnk';
}

=pod

=item C<remove_menu_shortcut($place, $name)>

For uninstallation of an individual package.

=cut

sub remove_menu_shortcut {
  my $place = shift;
  my $name = shift;
  $place =~ s!\\!/!g;
  $place = '/'.$place unless $place =~ m!^/!;
  unlink menu_path().$place.'/'.$name.'.lnk';
}

=pod

=back

=head2 UNINSTALLER

=over 4

=item C<create_uninstaller>

Writes registry entries for add/remove programs which  reference
the uninstaller script and creates uninstaller batchfiles to finish
the job.

=cut

sub create_uninstaller {
  my $td_fw = shift;
  # TEXDIR, TEXMFSYSVAR, TEXMFSYSCONFIG
  $td_fw =~ s![\\/]$!!;
  my $td = $td_fw;
  $td =~ s!/!\\!g;

  my $tdmain = `$td\\bin\\win32\\kpsewhich -var-value=TEXMFMAIN`;
  chomp $tdmain;

  my $uninst_key = $Registry -> Open((admin() ? "LMachine" : "CUser") .
    "/software/microsoft/windows/currentversion/",
    {Access => KEY_ALL_ACCESS()});
  my $k = $uninst_key->CreateKey(
    "uninstall/TeXLive$::TeXLive::TLConfig::ReleaseYear/");
  $k->{"/DisplayName"} = "TeX Live $::TeXLive::TLConfig::ReleaseYear";
  $k->{"/UninstallString"} = "\"$td\\tlpkg\\installer\\uninst.bat\"";
  $k->{'/DisplayVersion'} = $::TeXLive::TLConfig::ReleaseYear;
  $k->{'/URLInfoAbout'} = "http://www.tug.org/texlive";

  mkdirhier("$td_fw/tlpkg/installer"); # wasn't this done yet?
  if (open UNINST, ">$td_fw/tlpkg/installer/uninst.bat") {
    print UNINST <<UNEND;
\@echo off
setlocal
path $td\\tlpkg\\tlperl\\bin;$td\\bin\\win32;%path%
set PERL5LIB=$td\\tlpkg\\tlperl\\lib
rem Clean environment from other Perl variables
set PERL5OPT=
set PERLIO=
set PERLIO_DEBUG=
set PERLLIB=
set PERL5DB=
set PERL5DB_THREADED=
set PERL5SHELL=
set PERL_ALLOW_NON_IFS_LSP=
set PERL_DEBUG_MSTATS=
set PERL_DESTRUCT_LEVEL=
set PERL_DL_NONLAZY=
set PERL_ENCODING=
set PERL_HASH_SEED=
set PERL_HASH_SEED_DEBUG=
set PERL_ROOT=
set PERL_SIGNALS=
set PERL_UNICODE=

perl.exe \"$tdmain\\scripts\\texlive\\uninstall-win32.pl\"
if errorlevel 1 goto :eof
rem test for taskkill and try to stop exit tray menu
taskkill /? >nul 2>&1
if not errorlevel 1 1>nul 2>&1 taskkill /IM tl-tray-menu.exe /f
copy \"$td\\tlpkg\\installer\\uninst2.bat\" \"\%TEMP\%\"
rem pause
\"\%TEMP\%\\uninst2.bat\"
UNEND
;
  close UNINST;
  } else {
    warn "Cannot open $td_fw/tlpkg/installer/uninst.bat for append";
  }

  # We could simply delete everything under the root at one go,
  # but this might be catastrophic if TL doesn't have its own root.
  if (open UNINST2, ">$td_fw/tlpkg/installer/uninst2.bat") {
    print UNINST2 <<UNEND2;
rmdir /s /q \"$td\\bin\"
rmdir /s /q \"$td\\readme-html.dir\"
rmdir /s /q \"$td\\readme-txt.dir\"
if exist \"$td\\temp\" rmdir /s /q \"$td\\temp\"
rmdir /s /q \"$td\\texmf-dist\"
rmdir /s /q \"$td\\tlpkg\"
del /q \"$td\\README.*\"
del /q \"$td\\LICENSE.*\"
if exist \"$td\\doc.html\" del /q \"$td\\doc.html\"
del /q \"$td\\index.html\"
del /q \"$td\\texmf.cnf\"
del /q \"$td\\texmfcnf.lua\"
del /q \"$td\\install-tl*.*\"
del /q \"$td\\tl-tray-menu.exe\"
rem del /q \"$td\\texlive.profile\"
del /q \"$td\\release-texlive.txt\"
UNEND2
;
    for my $d ('TEXMFSYSVAR', 'TEXMFSYSCONFIG') {
      my $kd = `$td\\bin\\win32\\kpsewhich -var-value=$d`;
      chomp $kd;
      print UNINST2 "rmdir /s /q \"", $kd, "\"\r\n";
    }
    if ($td !~ /^.:$/) {
      print UNINST2 <<UNEND3;
for \%\%f in (\"$td\\*\") do goto :done
for /d \%\%f in (\"$td\\*\") do goto :done
rd \"$td\"
:done
\@echo Done uninstalling TeXLive.
\@pause
del \"%0\"
UNEND3
;
    }
    close UNINST2;
  } else {
    warn "Cannot open $td_fw/tlpkg/installer/uninst2.bat for writing";
  }
}

=pod

=item C<unregister_uninstaller>

Removes TeXLive from Add/Remove Programs.

=cut

sub unregister_uninstaller {
  my ($w32_multi_user) = @_;
  my $regkey_uninst_path = ($w32_multi_user ? "LMachine" : "CUser") . 
    "/software/microsoft/windows/currentversion/uninstall/";
  my $regkey_uninst = $Registry->Open($regkey_uninst_path,
    {Access => KEY_ALL_ACCESS()});
  reg_delete_recurse(
    $regkey_uninst, "TeXLive$::TeXLive::TLConfig::ReleaseYear/") 
    if $regkey_uninst;
  tlwarn "Failure to unregister uninstaller\n" if
    $regkey_uninst->{"TeXLive$::TeXLive::TLConfig::ReleaseYear/"};
}

=pod

=back

=cut

# needs a terminal 1 for require to succeed!
1;

### Local Variables:
### perl-indent-level: 2
### tab-width: 2
### indent-tabs-mode: nil
### End:
# vim:set tabstop=2 expandtab: #