summaryrefslogtreecommitdiff
path: root/systems/texlive/tlnet/tlpkg/tlperl/lib/ExtUtils/Manifest.pm
blob: 4163c933abf3cc9c78c6f67292b0ea97201ec2d3 (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
package ExtUtils::Manifest;

require Exporter;
use Config;
use File::Basename;
use File::Copy 'copy';
use File::Find;
use File::Spec 0.8;
use Carp;
use strict;
use warnings;

our $VERSION = '1.70';
our @ISA = ('Exporter');
our @EXPORT_OK = qw(mkmanifest
                manicheck  filecheck  fullcheck  skipcheck
                manifind   maniread   manicopy   maniadd
                maniskip
               );

our $Is_MacOS = $^O eq 'MacOS';
our $Is_VMS   = $^O eq 'VMS';
our $Is_VMS_mode = 0;
our $Is_VMS_lc = 0;
our $Is_VMS_nodot = 0;  # No dots in dir names or double dots in files

if ($Is_VMS) {
    require VMS::Filespec if $Is_VMS;
    my $vms_unix_rpt;
    my $vms_efs;
    my $vms_case;

    $Is_VMS_mode = 1;
    $Is_VMS_lc = 1;
    $Is_VMS_nodot = 1;
    if (eval { local $SIG{__DIE__}; require VMS::Feature; }) {
        $vms_unix_rpt = VMS::Feature::current("filename_unix_report");
        $vms_efs = VMS::Feature::current("efs_charset");
        $vms_case = VMS::Feature::current("efs_case_preserve");
    } else {
        my $unix_rpt = $ENV{'DECC$FILENAME_UNIX_REPORT'} || '';
        my $efs_charset = $ENV{'DECC$EFS_CHARSET'} || '';
        my $efs_case = $ENV{'DECC$EFS_CASE_PRESERVE'} || '';
        $vms_unix_rpt = $unix_rpt =~ /^[ET1]/i;
        $vms_efs = $efs_charset =~ /^[ET1]/i;
        $vms_case = $efs_case =~ /^[ET1]/i;
    }
    $Is_VMS_lc = 0 if ($vms_case);
    $Is_VMS_mode = 0 if ($vms_unix_rpt);
    $Is_VMS_nodot = 0 if ($vms_efs);
}

our $Debug   = $ENV{PERL_MM_MANIFEST_DEBUG} || 0;
our $Verbose = defined $ENV{PERL_MM_MANIFEST_VERBOSE} ?
                   $ENV{PERL_MM_MANIFEST_VERBOSE} : 1;
our $Quiet = 0;
our $MANIFEST = 'MANIFEST';

our $DEFAULT_MSKIP = File::Spec->catfile( dirname(__FILE__), "$MANIFEST.SKIP" );


=head1 NAME

ExtUtils::Manifest - utilities to write and check a MANIFEST file

=head1 VERSION

version 1.70

=head1 SYNOPSIS

    use ExtUtils::Manifest qw(...funcs to import...);

    mkmanifest();

    my @missing_files    = manicheck;
    my @skipped          = skipcheck;
    my @extra_files      = filecheck;
    my($missing, $extra) = fullcheck;

    my $found    = manifind();

    my $manifest = maniread();

    manicopy($read,$target);

    maniadd({$file => $comment, ...});


=head1 DESCRIPTION

=head2 Functions

ExtUtils::Manifest exports no functions by default.  The following are
exported on request

=over 4

=item mkmanifest

    mkmanifest();

Writes all files in and below the current directory to your F<MANIFEST>.
It works similar to the result of the Unix command

    find . > MANIFEST

All files that match any regular expression in a file F<MANIFEST.SKIP>
(if it exists) are ignored.

Any existing F<MANIFEST> file will be saved as F<MANIFEST.bak>.

=cut

sub _sort {
    return sort { lc $a cmp lc $b } @_;
}

sub mkmanifest {
    my $manimiss = 0;
    my $read = (-r 'MANIFEST' && maniread()) or $manimiss++;
    $read = {} if $manimiss;
    local *M;
    my $bakbase = $MANIFEST;
    $bakbase =~ s/\./_/g if $Is_VMS_nodot; # avoid double dots
    rename $MANIFEST, "$bakbase.bak" unless $manimiss;
    open M, "> $MANIFEST" or die "Could not open $MANIFEST: $!";
    binmode M, ':raw';
    my $skip = maniskip();
    my $found = manifind();
    my($key,$val,$file,%all);
    %all = (%$found, %$read);
    $all{$MANIFEST} = ($Is_VMS_mode ? "$MANIFEST\t\t" : '') .
                     'This list of files'
        if $manimiss; # add new MANIFEST to known file list
    foreach $file (_sort keys %all) {
	if ($skip->($file)) {
	    # Policy: only remove files if they're listed in MANIFEST.SKIP.
	    # Don't remove files just because they don't exist.
	    warn "Removed from $MANIFEST: $file\n" if $Verbose and exists $read->{$file};
	    next;
	}
	if ($Verbose){
	    warn "Added to $MANIFEST: $file\n" unless exists $read->{$file};
	}
	my $text = $all{$file};
	$file = _unmacify($file);
	my $tabs = (5 - (length($file)+1)/8);
	$tabs = 1 if $tabs < 1;
	$tabs = 0 unless $text;
        if ($file =~ /\s/) {
            $file =~ s/([\\'])/\\$1/g;
            $file = "'$file'";
        }
	print M $file, "\t" x $tabs, $text, "\n";
    }
    close M;
}

# Geez, shouldn't this use File::Spec or File::Basename or something?
# Why so careful about dependencies?
sub clean_up_filename {
  my $filename = shift;
  $filename =~ s|^\./||;
  $filename =~ s/^:([^:]+)$/$1/ if $Is_MacOS;
  if ( $Is_VMS ) {
      $filename =~ s/\.$//;                           # trim trailing dot
      $filename = VMS::Filespec::unixify($filename);  # unescape spaces, etc.
      if( $Is_VMS_lc ) {
          $filename = lc($filename);
          $filename = uc($filename) if $filename =~ /^MANIFEST(\.SKIP)?$/i;
      }
  }
  return $filename;
}


=item manifind

    my $found = manifind();

returns a hash reference. The keys of the hash are the files found
below the current directory.

=cut

sub manifind {
    my $p = shift || {};
    my $found = {};

    my $wanted = sub {
	my $name = clean_up_filename($File::Find::name);
	warn "Debug: diskfile $name\n" if $Debug;
	return if -d $_;
	$found->{$name} = "";
    };

    # We have to use "$File::Find::dir/$_" in preprocess, because
    # $File::Find::name is unavailable.
    # Also, it's okay to use / here, because MANIFEST files use Unix-style
    # paths.
    find({wanted => $wanted, follow_fast => 1},
	 $Is_MacOS ? ":" : ".");

    return $found;
}


=item manicheck

    my @missing_files = manicheck();

checks if all the files within a C<MANIFEST> in the current directory
really do exist. If C<MANIFEST> and the tree below the current
directory are in sync it silently returns an empty list.
Otherwise it returns a list of files which are listed in the
C<MANIFEST> but missing from the directory, and by default also
outputs these names to STDERR.

=cut

sub manicheck {
    return _check_files();
}


=item filecheck

    my @extra_files = filecheck();

finds files below the current directory that are not mentioned in the
C<MANIFEST> file. An optional file C<MANIFEST.SKIP> will be
consulted. Any file matching a regular expression in such a file will
not be reported as missing in the C<MANIFEST> file. The list of any
extraneous files found is returned, and by default also reported to
STDERR.

=cut

sub filecheck {
    return _check_manifest();
}


=item fullcheck

    my($missing, $extra) = fullcheck();

does both a manicheck() and a filecheck(), returning then as two array
refs.

=cut

sub fullcheck {
    return [_check_files()], [_check_manifest()];
}


=item skipcheck

    my @skipped = skipcheck();

lists all the files that are skipped due to your C<MANIFEST.SKIP>
file.

=cut

sub skipcheck {
    my($p) = @_;
    my $found = manifind();
    my $matches = maniskip();

    my @skipped = ();
    foreach my $file (_sort keys %$found){
        if (&$matches($file)){
            warn "Skipping $file\n" unless $Quiet;
            push @skipped, $file;
            next;
        }
    }

    return @skipped;
}


sub _check_files {
    my $p = shift;
    my $dosnames=(defined(&Dos::UseLFN) && Dos::UseLFN()==0);
    my $read = maniread() || {};
    my $found = manifind($p);

    my(@missfile) = ();
    foreach my $file (_sort keys %$read){
        warn "Debug: manicheck checking from $MANIFEST $file\n" if $Debug;
        if ($dosnames){
            $file = lc $file;
            $file =~ s=(\.(\w|-)+)=substr ($1,0,4)=ge;
            $file =~ s=((\w|-)+)=substr ($1,0,8)=ge;
        }
        unless ( exists $found->{$file} ) {
            warn "No such file: $file\n" unless $Quiet;
            push @missfile, $file;
        }
    }

    return @missfile;
}


sub _check_manifest {
    my($p) = @_;
    my $read = maniread() || {};
    my $found = manifind($p);
    my $skip  = maniskip();

    my @missentry = ();
    foreach my $file (_sort keys %$found){
        next if $skip->($file);
        warn "Debug: manicheck checking from disk $file\n" if $Debug;
        unless ( exists $read->{$file} ) {
            my $canon = $Is_MacOS ? "\t" . _unmacify($file) : '';
            warn "Not in $MANIFEST: $file$canon\n" unless $Quiet;
            push @missentry, $file;
        }
    }

    return @missentry;
}


=item maniread

    my $manifest = maniread();
    my $manifest = maniread($manifest_file);

reads a named C<MANIFEST> file (defaults to C<MANIFEST> in the current
directory) and returns a HASH reference with files being the keys and
comments being the values of the HASH.  Blank lines and lines which
start with C<#> in the C<MANIFEST> file are discarded.

=cut

sub maniread {
    my ($mfile) = @_;
    $mfile ||= $MANIFEST;
    my $read = {};
    local *M;
    unless (open M, "< $mfile"){
        warn "Problem opening $mfile: $!";
        return $read;
    }
    local $_;
    while (<M>){
        chomp;
        next if /^\s*#/;

        my($file, $comment);

        # filename may contain spaces if enclosed in ''
        # (in which case, \\ and \' are escapes)
        if (($file, $comment) = /^'((?:\\[\\']|.+)+)'\s*(.*)/) {
            $file =~ s/\\([\\'])/$1/g;
        }
        else {
            ($file, $comment) = /^(\S+)\s*(.*)/;
        }
        next unless $file;

        if ($Is_MacOS) {
            $file = _macify($file);
            $file =~ s/\\([0-3][0-7][0-7])/sprintf("%c", oct($1))/ge;
        }
        elsif ($Is_VMS_mode) {
            require File::Basename;
            my($base,$dir) = File::Basename::fileparse($file);
            # Resolve illegal file specifications in the same way as tar
            if ($Is_VMS_nodot) {
                $dir =~ tr/./_/;
                my(@pieces) = split(/\./,$base);
                if (@pieces > 2)
                    { $base = shift(@pieces) . '.' . join('_',@pieces); }
                my $okfile = "$dir$base";
                warn "Debug: Illegal name $file changed to $okfile\n" if $Debug;
                $file = $okfile;
            }
            if( $Is_VMS_lc ) {
                $file = lc($file);
                $file = uc($file) if $file =~ /^MANIFEST(\.SKIP)?$/i;
            }
        }

        $read->{$file} = $comment;
    }
    close M;
    $read;
}

=item maniskip

    my $skipchk = maniskip();
    my $skipchk = maniskip($manifest_skip_file);

    if ($skipchk->($file)) { .. }

reads a named C<MANIFEST.SKIP> file (defaults to C<MANIFEST.SKIP> in
the current directory) and returns a CODE reference that tests whether
a given filename should be skipped.

=cut

# returns an anonymous sub that decides if an argument matches
sub maniskip {
    my @skip ;
    my $mfile = shift || "$MANIFEST.SKIP";
    _check_mskip_directives($mfile) if -f $mfile;
    local(*M, $_);
    open M, "< $mfile" or open M, "< $DEFAULT_MSKIP" or return sub {0};
    while (<M>){
      chomp;
      s/\r//;
      $_ =~ qr{^\s*(?:(?:'([^\\']*(?:\\.[^\\']*)*)')|([^#\s]\S*))?(?:(?:\s*)|(?:\s+(.*?)\s*))$};
      #my $comment = $3;
      my $filename = $2;
      if ( defined($1) ) {
        $filename = $1;
        $filename =~ s/\\(['\\])/$1/g;
      }
      next if (not defined($filename) or not $filename);
      push @skip, _macify($filename);
    }
    close M;
    return sub {0} unless (scalar @skip > 0);

    my $opts = $Is_VMS_mode ? '(?i)' : '';

    # Make sure each entry is isolated in its own parentheses, in case
    # any of them contain alternations
    my $regex = join '|', map "(?:$_)", @skip;

    return sub { $_[0] =~ qr{$opts$regex} };
}

# checks for the special directives
#   #!include_default
#   #!include /path/to/some/manifest.skip
# in a custom MANIFEST.SKIP for, for including
# the content of, respectively, the default MANIFEST.SKIP
# and an external manifest.skip file
sub _check_mskip_directives {
    my $mfile = shift;
    local (*M, $_);
    my @lines = ();
    my $flag = 0;
    unless (open M, "< $mfile") {
        warn "Problem opening $mfile: $!";
        return;
    }
    while (<M>) {
        if (/^#!include_default\s*$/) {
	    if (my @default = _include_mskip_file()) {
	        push @lines, @default;
		warn "Debug: Including default MANIFEST.SKIP\n" if $Debug;
		$flag++;
	    }
	    next;
        }
	if (/^#!include\s+(.*)\s*$/) {
	    my $external_file = $1;
	    if (my @external = _include_mskip_file($external_file)) {
	        push @lines, @external;
		warn "Debug: Including external $external_file\n" if $Debug;
		$flag++;
	    }
            next;
        }
        push @lines, $_;
    }
    close M;
    return unless $flag;
    my $bakbase = $mfile;
    $bakbase =~ s/\./_/g if $Is_VMS_nodot;  # avoid double dots
    rename $mfile, "$bakbase.bak";
    warn "Debug: Saving original $mfile as $bakbase.bak\n" if $Debug;
    unless (open M, "> $mfile") {
        warn "Problem opening $mfile: $!";
        return;
    }
    binmode M, ':raw';
    print M $_ for (@lines);
    close M;
    return;
}

# returns an array containing the lines of an external
# manifest.skip file, if given, or $DEFAULT_MSKIP
sub _include_mskip_file {
    my $mskip = shift || $DEFAULT_MSKIP;
    unless (-f $mskip) {
        warn qq{Included file "$mskip" not found - skipping};
        return;
    }
    local (*M, $_);
    unless (open M, "< $mskip") {
        warn "Problem opening $mskip: $!";
        return;
    }
    my @lines = ();
    push @lines, "\n#!start included $mskip\n";
    push @lines, $_ while <M>;
    close M;
    push @lines, "#!end included $mskip\n\n";
    return @lines;
}

=item manicopy

    manicopy(\%src, $dest_dir);
    manicopy(\%src, $dest_dir, $how);

Copies the files that are the keys in %src to the $dest_dir.  %src is
typically returned by the maniread() function.

    manicopy( maniread(), $dest_dir );

This function is useful for producing a directory tree identical to the
intended distribution tree.

$how can be used to specify a different methods of "copying".  Valid
values are C<cp>, which actually copies the files, C<ln> which creates
hard links, and C<best> which mostly links the files but copies any
symbolic link to make a tree without any symbolic link.  C<cp> is the
default.

=cut

sub manicopy {
    my($read,$target,$how)=@_;
    croak "manicopy() called without target argument" unless defined $target;
    $how ||= 'cp';
    require File::Path;
    require File::Basename;

    $target = VMS::Filespec::unixify($target) if $Is_VMS_mode;
    File::Path::mkpath([ $target ],! $Quiet,$Is_VMS ? undef : 0755);
    foreach my $file (keys %$read){
	if ($Is_MacOS) {
	    if ($file =~ m!:!) {
		my $dir = _maccat($target, $file);
		$dir =~ s/[^:]+$//;
		File::Path::mkpath($dir,1,0755);
	    }
	    cp_if_diff($file, _maccat($target, $file), $how);
	} else {
	    $file = VMS::Filespec::unixify($file) if $Is_VMS_mode;
	    if ($file =~ m!/!) { # Ilya, that hurts, I fear, or maybe not?
		my $dir = File::Basename::dirname($file);
		$dir = VMS::Filespec::unixify($dir) if $Is_VMS_mode;
		File::Path::mkpath(["$target/$dir"],! $Quiet,$Is_VMS ? undef : 0755);
	    }
	    cp_if_diff($file, "$target/$file", $how);
	}
    }
}

sub cp_if_diff {
    my($from, $to, $how)=@_;
    if (! -f $from) {
        carp "$from not found";
        return;
    }
    my($diff) = 0;
    local(*F,*T);
    open(F,"< $from\0") or die "Can't read $from: $!\n";
    if (open(T,"< $to\0")) {
        local $_;
	while (<F>) { $diff++,last if $_ ne <T>; }
	$diff++ unless eof(T);
	close T;
    }
    else { $diff++; }
    close F;
    if ($diff) {
	if (-e $to) {
	    unlink($to) or confess "unlink $to: $!";
	}
        STRICT_SWITCH: {
	    best($from,$to), last STRICT_SWITCH if $how eq 'best';
	    cp($from,$to), last STRICT_SWITCH if $how eq 'cp';
	    ln($from,$to), last STRICT_SWITCH if $how eq 'ln';
	    croak("ExtUtils::Manifest::cp_if_diff " .
		  "called with illegal how argument [$how]. " .
		  "Legal values are 'best', 'cp', and 'ln'.");
	}
    }
}

sub cp {
    my ($srcFile, $dstFile) = @_;
    my ($access,$mod) = (stat $srcFile)[8,9];

    copy($srcFile,$dstFile);
    utime $access, $mod + ($Is_VMS ? 1 : 0), $dstFile;
    _manicopy_chmod($srcFile, $dstFile);
}


sub ln {
    my ($srcFile, $dstFile) = @_;
    # Fix-me - VMS can support links.
    return &cp if $Is_VMS or ($^O eq 'MSWin32' and Win32::IsWin95());
    link($srcFile, $dstFile);

    unless( _manicopy_chmod($srcFile, $dstFile) ) {
        unlink $dstFile;
        return;
    }
    1;
}

# 1) Strip off all group and world permissions.
# 2) Let everyone read it.
# 3) If the owner can execute it, everyone can.
sub _manicopy_chmod {
    my($srcFile, $dstFile) = @_;

    my $perm = 0444 | (stat $srcFile)[2] & 0700;
    chmod( $perm | ( $perm & 0100 ? 0111 : 0 ), $dstFile );
}

# Files that are often modified in the distdir.  Don't hard link them.
my @Exceptions = qw(MANIFEST META.yml SIGNATURE);
sub best {
    my ($srcFile, $dstFile) = @_;

    my $is_exception = grep $srcFile =~ /$_/, @Exceptions;
    if ($is_exception or !$Config{d_link} or -l $srcFile) {
	cp($srcFile, $dstFile);
    } else {
	ln($srcFile, $dstFile) or cp($srcFile, $dstFile);
    }
}

sub _macify {
    my($file) = @_;

    return $file unless $Is_MacOS;

    $file =~ s|^\./||;
    if ($file =~ m|/|) {
	$file =~ s|/+|:|g;
	$file = ":$file";
    }

    $file;
}

sub _maccat {
    my($f1, $f2) = @_;

    return "$f1/$f2" unless $Is_MacOS;

    $f1 .= ":$f2";
    $f1 =~ s/([^:]:):/$1/g;
    return $f1;
}

sub _unmacify {
    my($file) = @_;

    return $file unless $Is_MacOS;

    $file =~ s|^:||;
    $file =~ s|([/ \n])|sprintf("\\%03o", unpack("c", $1))|ge;
    $file =~ y|:|/|;

    $file;
}


=item maniadd

  maniadd({ $file => $comment, ...});

Adds an entry to an existing F<MANIFEST> unless its already there.

$file will be normalized (ie. Unixified).  B<UNIMPLEMENTED>

=cut

sub maniadd {
    my($additions) = shift;

    _normalize($additions);
    _fix_manifest($MANIFEST);

    my $manifest = maniread();
    my @needed = grep { !exists $manifest->{$_} } keys %$additions;
    return 1 unless @needed;

    open(MANIFEST, ">>$MANIFEST") or
      die "maniadd() could not open $MANIFEST: $!";
    binmode MANIFEST, ':raw';

    foreach my $file (_sort @needed) {
        my $comment = $additions->{$file} || '';
        if ($file =~ /\s/) {
            $file =~ s/([\\'])/\\$1/g;
            $file = "'$file'";
        }
        printf MANIFEST "%-40s %s\n", $file, $comment;
    }
    close MANIFEST or die "Error closing $MANIFEST: $!";

    return 1;
}


# Make sure this MANIFEST is consistently written with native
# newlines and has a terminal newline.
sub _fix_manifest {
    my $manifest_file = shift;

    open MANIFEST, $MANIFEST or die "Could not open $MANIFEST: $!";
    local $/;
    my @manifest = split /(\015\012|\012|\015)/, <MANIFEST>, -1;
    close MANIFEST;
    my $must_rewrite = "";
    if ($manifest[-1] eq ""){
        # sane case: last line had a terminal newline
        pop @manifest;
        for (my $i=1; $i<=$#manifest; $i+=2) {
            unless ($manifest[$i] eq "\n") {
                $must_rewrite = "not a newline at pos $i";
                last;
            }
        }
    } else {
        $must_rewrite = "last line without newline";
    }

    if ( $must_rewrite ) {
        1 while unlink $MANIFEST; # avoid multiple versions on VMS
        open MANIFEST, ">", $MANIFEST or die "(must_rewrite=$must_rewrite) Could not open >$MANIFEST: $!";
	binmode MANIFEST, ':raw';
        for (my $i=0; $i<=$#manifest; $i+=2) {
            print MANIFEST "$manifest[$i]\n";
        }
        close MANIFEST or die "could not write $MANIFEST: $!";
    }
}


# UNIMPLEMENTED
sub _normalize {
    return;
}


=back

=head2 MANIFEST

A list of files in the distribution, one file per line.  The MANIFEST
always uses Unix filepath conventions even if you're not on Unix.  This
means F<foo/bar> style not F<foo\bar>.

Anything between white space and an end of line within a C<MANIFEST>
file is considered to be a comment.  Any line beginning with # is also
a comment. Beginning with ExtUtils::Manifest 1.52, a filename may
contain whitespace characters if it is enclosed in single quotes; single
quotes or backslashes in that filename must be backslash-escaped.

    # this a comment
    some/file
    some/other/file            comment about some/file
    'some/third file'          comment


=head2 MANIFEST.SKIP

The file MANIFEST.SKIP may contain regular expressions of files that
should be ignored by mkmanifest() and filecheck(). The regular
expressions should appear one on each line. Blank lines and lines
which start with C<#> are skipped.  Use C<\#> if you need a regular
expression to start with a C<#>.

For example:

    # Version control files and dirs.
    \bRCS\b
    \bCVS\b
    ,v$
    \B\.svn\b

    # Makemaker generated files and dirs.
    ^MANIFEST\.
    ^Makefile$
    ^blib/
    ^MakeMaker-\d

    # Temp, old and emacs backup files.
    ~$
    \.old$
    ^#.*#$
    ^\.#

If no MANIFEST.SKIP file is found, a default set of skips will be
used, similar to the example above.  If you want nothing skipped,
simply make an empty MANIFEST.SKIP file.

In one's own MANIFEST.SKIP file, certain directives
can be used to include the contents of other MANIFEST.SKIP
files. At present two such directives are recognized.

=over 4

=item #!include_default

This inserts the contents of the default MANIFEST.SKIP file

=item #!include /Path/to/another/manifest.skip

This inserts the contents of the specified external file

=back

The included contents will be inserted into the MANIFEST.SKIP
file in between I<#!start included /path/to/manifest.skip>
and I<#!end included /path/to/manifest.skip> markers.
The original MANIFEST.SKIP is saved as MANIFEST.SKIP.bak.

=head2 EXPORT_OK

C<&mkmanifest>, C<&manicheck>, C<&filecheck>, C<&fullcheck>,
C<&maniread>, and C<&manicopy> are exportable.

=head2 GLOBAL VARIABLES

C<$ExtUtils::Manifest::MANIFEST> defaults to C<MANIFEST>. Changing it
results in both a different C<MANIFEST> and a different
C<MANIFEST.SKIP> file. This is useful if you want to maintain
different distributions for different audiences (say a user version
and a developer version including RCS).

C<$ExtUtils::Manifest::Quiet> defaults to 0. If set to a true value,
all functions act silently.

C<$ExtUtils::Manifest::Debug> defaults to 0.  If set to a true value,
or if PERL_MM_MANIFEST_DEBUG is true, debugging output will be
produced.

=head1 DIAGNOSTICS

All diagnostic output is sent to C<STDERR>.

=over 4

=item C<Not in MANIFEST:> I<file>

is reported if a file is found which is not in C<MANIFEST>.

=item C<Skipping> I<file>

is reported if a file is skipped due to an entry in C<MANIFEST.SKIP>.

=item C<No such file:> I<file>

is reported if a file mentioned in a C<MANIFEST> file does not
exist.

=item C<MANIFEST:> I<$!>

is reported if C<MANIFEST> could not be opened.

=item C<Added to MANIFEST:> I<file>

is reported by mkmanifest() if $Verbose is set and a file is added
to MANIFEST. $Verbose is set to 1 by default.

=back

=head1 ENVIRONMENT

=over 4

=item B<PERL_MM_MANIFEST_DEBUG>

Turns on debugging

=back

=head1 SEE ALSO

L<ExtUtils::MakeMaker> which has handy targets for most of the functionality.

=head1 AUTHOR

Andreas Koenig C<andreas.koenig@anima.de>

Currently maintained by the Perl Toolchain Gang.

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 1996- by Andreas Koenig.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut

1;