aboutsummaryrefslogtreecommitdiff
path: root/IkiWiki.pm
blob: b6a2a3649d83a608b1ea41e4d7d46695f0219460 (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
#!/usr/bin/perl

package IkiWiki;
use warnings;
use strict;
use Encode;
use HTML::Entities;
use open qw{:utf8 :std};

use vars qw{%config %links %oldlinks %oldpagemtime %pagectime %pagecase
            %renderedfiles %oldrenderedfiles %pagesources %depends %hooks
	    %forcerebuild};

use Exporter q{import};
our @EXPORT = qw(hook debug error template htmlpage add_depends pagespec_match
                 bestlink htmllink readfile writefile pagetype srcfile pagename
                 displaytime will_render
                 %config %links %renderedfiles %pagesources);
our $VERSION = 1.01; # plugin interface version

# Optimisation.
use Memoize;
memoize("abs2rel");
memoize("pagespec_translate");
memoize("file_pruned");

my $installdir=''; # INSTALLDIR_AUTOREPLACE done by Makefile, DNE
our $version='unknown'; # VERSION_AUTOREPLACE done by Makefile, DNE

sub defaultconfig () { #{{{
	wiki_file_prune_regexps => [qr/\.\./, qr/^\./, qr/\/\./, qr/\.x?html?$/,
		qr/(^|\/).svn\//, qr/.arch-ids\//, qr/{arch}\//],
	wiki_link_regexp => qr/\[\[(?:([^\]\|]+)\|)?([^\s\]]+)\]\]/,
	wiki_file_regexp => qr/(^[-[:alnum:]_.:\/+]+$)/,
	web_commit_regexp => qr/^web commit (by (.*?(?=: |$))|from (\d+\.\d+\.\d+\.\d+)):?(.*)/,
	verbose => 0,
	syslog => 0,
	wikiname => "wiki",
	default_pageext => "mdwn",
	cgi => 0,
	rcs => '',
	notify => 0,
	url => '',
	cgiurl => '',
	historyurl => '',
	diffurl => '',
	anonok => 0,
	rss => 0,
	atom => 0,
	discussion => 1,
	rebuild => 0,
	refresh => 0,
	getctime => 0,
	w3mmode => 0,
	wrapper => undef,
	wrappermode => undef,
	svnrepo => undef,
	svnpath => "trunk",
	srcdir => undef,
	destdir => undef,
	pingurl => [],
	templatedir => "$installdir/share/ikiwiki/templates",
	underlaydir => "$installdir/share/ikiwiki/basewiki",
	setup => undef,
	adminuser => undef,
	adminemail => undef,
	plugin => [qw{mdwn inline htmlscrubber passwordauth}],
	timeformat => '%c',
	locale => undef,
	sslcookie => 0,
	httpauth => 0,
	userdir => "",
} #}}}
   
sub checkconfig () { #{{{
	# locale stuff; avoid LC_ALL since it overrides everything
	if (defined $ENV{LC_ALL}) {
		$ENV{LANG} = $ENV{LC_ALL};
		delete $ENV{LC_ALL};
	}
	if (defined $config{locale}) {
		eval q{use POSIX};
		error($@) if $@;
		$ENV{LANG} = $config{locale}
			if POSIX::setlocale(&POSIX::LC_TIME, $config{locale});
	}

	if ($config{w3mmode}) {
		eval q{use Cwd q{abs_path}};
		error($@) if $@;
		$config{srcdir}=possibly_foolish_untaint(abs_path($config{srcdir}));
		$config{destdir}=possibly_foolish_untaint(abs_path($config{destdir}));
		$config{cgiurl}="file:///\$LIB/ikiwiki-w3m.cgi/".$config{cgiurl}
			unless $config{cgiurl} =~ m!file:///!;
		$config{url}="file://".$config{destdir};
	}

	if ($config{cgi} && ! length $config{url}) {
		error("Must specify url to wiki with --url when using --cgi\n");
	}
	
	$config{wikistatedir}="$config{srcdir}/.ikiwiki"
		unless exists $config{wikistatedir};
	
	if ($config{rcs}) {
		eval qq{require IkiWiki::Rcs::$config{rcs}};
		if ($@) {
			error("Failed to load RCS module IkiWiki::Rcs::$config{rcs}: $@");
		}
	}
	else {
		require IkiWiki::Rcs::Stub;
	}

	run_hooks(checkconfig => sub { shift->() });
} #}}}

sub loadplugins () { #{{{
	loadplugin($_) foreach @{$config{plugin}};
	
	run_hooks(getopt => sub { shift->() });
	if (grep /^-/, @ARGV) {
		print STDERR "Unknown option: $_\n"
			foreach grep /^-/, @ARGV;
		usage();
	}
} #}}}

sub loadplugin ($) { #{{{
	my $plugin=shift;

	my $mod="IkiWiki::Plugin::".possibly_foolish_untaint($plugin);
	eval qq{use $mod};
	if ($@) {
		error("Failed to load plugin $mod: $@");
	}
} #}}}

sub error ($) { #{{{
	if ($config{cgi}) {
		print "Content-type: text/html\n\n";
		print misctemplate("Error", "<p>Error: @_</p>");
	}
	log_message(error => @_);
	exit(1);
} #}}}

sub debug ($) { #{{{
	return unless $config{verbose};
	log_message(debug => @_);
} #}}}

my $log_open=0;
sub log_message ($$) { #{{{
	my $type=shift;

	if ($config{syslog}) {
		require Sys::Syslog;
		unless ($log_open) {
			Sys::Syslog::setlogsock('unix');
			Sys::Syslog::openlog('ikiwiki', '', 'user');
			$log_open=1;
		}
		eval {
			Sys::Syslog::syslog($type, join(" ", @_));
		}
	}
	elsif (! $config{cgi}) {
		print "@_\n";
	}
	else {
		print STDERR "@_\n";
	}
} #}}}

sub possibly_foolish_untaint ($) { #{{{
	my $tainted=shift;
	my ($untainted)=$tainted=~/(.*)/;
	return $untainted;
} #}}}

sub basename ($) { #{{{
	my $file=shift;

	$file=~s!.*/+!!;
	return $file;
} #}}}

sub dirname ($) { #{{{
	my $file=shift;

	$file=~s!/*[^/]+$!!;
	return $file;
} #}}}

sub pagetype ($) { #{{{
	my $page=shift;
	
	if ($page =~ /\.([^.]+)$/) {
		return $1 if exists $hooks{htmlize}{$1};
	}
	return undef;
} #}}}

sub pagename ($) { #{{{
	my $file=shift;

	my $type=pagetype($file);
	my $page=$file;
	$page=~s/\Q.$type\E*$// if defined $type;
	return $page;
} #}}}

sub htmlpage ($) { #{{{
	my $page=shift;

	return $page.".html";
} #}}}

sub srcfile ($) { #{{{
	my $file=shift;

	return "$config{srcdir}/$file" if -e "$config{srcdir}/$file";
	return "$config{underlaydir}/$file" if -e "$config{underlaydir}/$file";
	error("internal error: $file cannot be found");
} #}}}

sub readfile ($;$) { #{{{
	my $file=shift;
	my $binary=shift;

	if (-l $file) {
		error("cannot read a symlink ($file)");
	}
	
	local $/=undef;
	open (IN, $file) || error("failed to read $file: $!");
	binmode(IN) if ($binary);
	my $ret=<IN>;
	close IN;
	return $ret;
} #}}}

sub writefile ($$$;$) { #{{{
	my $file=shift; # can include subdirs
	my $destdir=shift; # directory to put file in
	my $content=shift;
	my $binary=shift;
	
	my $test=$file;
	while (length $test) {
		if (-l "$destdir/$test") {
			error("cannot write to a symlink ($test)");
		}
		$test=dirname($test);
	}

	my $dir=dirname("$destdir/$file");
	if (! -d $dir) {
		my $d="";
		foreach my $s (split(m!/+!, $dir)) {
			$d.="$s/";
			if (! -d $d) {
				mkdir($d) || error("failed to create directory $d: $!");
			}
		}
	}
	
	open (OUT, ">$destdir/$file") || error("failed to write $destdir/$file: $!");
	binmode(OUT) if ($binary);
	print OUT $content;
	close OUT;
} #}}}

my %cleared;
sub will_render ($$;$) { #{{{
	my $page=shift;
	my $dest=shift;
	my $clear=shift;

	# Important security check.
	if (-e "$config{destdir}/$dest" && ! $config{rebuild} &&
	    ! grep { $_ eq $dest } (@{$renderedfiles{$page}}, @{$oldrenderedfiles{$page}})) {
		error("$config{destdir}/$dest independently created, not overwriting with version from $page");
	}

	if (! $clear || $cleared{$page}) {
		$renderedfiles{$page}=[$dest, grep { $_ ne $dest } @{$renderedfiles{$page}}];
	}
	else {
		$renderedfiles{$page}=[$dest];
		$cleared{$page}=1;
	}
} #}}}

sub bestlink ($$) { #{{{
	my $page=shift;
	my $link=shift;
	
	my $cwd=$page;
	if ($link=~s/^\/+//) {
		# absolute links
		$cwd="";
	}

	do {
		my $l=$cwd;
		$l.="/" if length $l;
		$l.=$link;

		if (exists $links{$l}) {
			return $l;
		}
		elsif (exists $pagecase{lc $l}) {
			return $pagecase{lc $l};
		}
	} while $cwd=~s!/?[^/]+$!!;

	#print STDERR "warning: page $page, broken link: $link\n";
	return "";
} #}}}

sub isinlinableimage ($) { #{{{
	my $file=shift;
	
	$file=~/\.(png|gif|jpg|jpeg)$/i;
} #}}}

sub pagetitle ($;$) { #{{{
	my $page=shift;
	my $unescaped=shift;

	if ($unescaped) {
		$page=~s/__(\d+)__/chr($1)/eg;
	}
	else {
		$page=~s/__(\d+)__/&#$1;/g;
	}
	$page=~y/_/ /;

	return $page;
} #}}}

sub titlepage ($) { #{{{
	my $title=shift;
	$title=~y/ /_/;
	$title=~s/([^-[:alnum:]_:+\/.])/"__".ord($1)."__"/eg;
	return $title;
} #}}}

sub cgiurl (@) { #{{{
	my %params=@_;

	return $config{cgiurl}."?".join("&amp;", map "$_=$params{$_}", keys %params);
} #}}}

sub baseurl (;$) { #{{{
	my $page=shift;

	return "$config{url}/" if ! defined $page;
	
	$page=~s/[^\/]+$//;
	$page=~s/[^\/]+\//..\//g;
	return $page;
} #}}}

sub abs2rel ($$) { #{{{
	# Work around very innefficient behavior in File::Spec if abs2rel
	# is passed two relative paths. It's much faster if paths are
	# absolute! (Debian bug #376658; fixed in debian unstable now)
	my $path="/".shift;
	my $base="/".shift;

	require File::Spec;
	my $ret=File::Spec->abs2rel($path, $base);
	$ret=~s/^// if defined $ret;
	return $ret;
} #}}}

sub displaytime ($) { #{{{
	my $time=shift;

	eval q{use POSIX};
	error($@) if $@;
	# strftime doesn't know about encodings, so make sure
	# its output is properly treated as utf8
	return decode_utf8(POSIX::strftime(
			$config{timeformat}, localtime($time)));
} #}}}

sub htmllink ($$$;$$$) { #{{{
	my $lpage=shift; # the page doing the linking
	my $page=shift; # the page that will contain the link (different for inline)
	my $link=shift;
	my $noimageinline=shift; # don't turn links into inline html images
	my $forcesubpage=shift; # force a link to a subpage
	my $linktext=shift; # set to force the link text to something

	my $bestlink;
	if (! $forcesubpage) {
		$bestlink=bestlink($lpage, $link);
	}
	else {
		$bestlink="$lpage/".lc($link);
	}

	$linktext=pagetitle(basename($link)) unless defined $linktext;
	
	return "<span class=\"selflink\">$linktext</span>"
		if length $bestlink && $page eq $bestlink;
	
	if (! grep { $_ eq $bestlink } map { @{$_} } values %renderedfiles) {
		$bestlink=htmlpage($bestlink);
	}
	if (! grep { $_ eq $bestlink } map { @{$_} } values %renderedfiles) {
		return $linktext unless length $config{cgiurl};
		return "<span><a href=\"".
			cgiurl(do => "create", page => lc($link), from => $page).
			"\">?</a>$linktext</span>"
	}
	
	$bestlink=abs2rel($bestlink, dirname($page));
	
	if (! $noimageinline && isinlinableimage($bestlink)) {
		return "<img src=\"$bestlink\" alt=\"$linktext\" />";
	}
	return "<a href=\"$bestlink\">$linktext</a>";
} #}}}

sub htmlize ($$$) { #{{{
	my $page=shift;
	my $type=shift;
	my $content=shift;

	if (exists $hooks{htmlize}{$type}) {
		$content=$hooks{htmlize}{$type}{call}->(
			page => $page,
			content => $content,
		);
	}
	else {
		error("htmlization of $type not supported");
	}

	run_hooks(sanitize => sub {
		$content=shift->(
			page => $page,
			content => $content,
		);
	});

	return $content;
} #}}}

sub linkify ($$$) { #{{{
	my $lpage=shift; # the page containing the links
	my $page=shift; # the page the link will end up on (different for inline)
	my $content=shift;

	$content =~ s{(\\?)$config{wiki_link_regexp}}{
		$2 ? ( $1 ? "[[$2|$3]]" : htmllink($lpage, $page, titlepage($3), 0, 0, pagetitle($2)))
		   : ( $1 ? "[[$3]]" :    htmllink($lpage, $page, titlepage($3)))
	}eg;
	
	return $content;
} #}}}

my %preprocessing;
sub preprocess ($$$;$) { #{{{
	my $page=shift; # the page the data comes from
	my $destpage=shift; # the page the data will appear in (different for inline)
	my $content=shift;
	my $scan=shift;

	my $handle=sub {
		my $escape=shift;
		my $command=shift;
		my $params=shift;
		if (length $escape) {
			return "[[$command $params]]";
		}
		elsif (exists $hooks{preprocess}{$command}) {
			return "" if $scan && ! $hooks{preprocess}{$command}{scan};
			# Note: preserve order of params, some plugins may
			# consider it significant.
			my @params;
			while ($params =~ /(?:(\w+)=)?(?:"""(.*?)"""|"([^"]+)"|(\S+))(?:\s+|$)/sg) {
				my $key=$1;
				my $val;
				if (defined $2) {
					$val=$2;
					$val=~s/\r\n/\n/mg;
					$val=~s/^\n+//g;
					$val=~s/\n+$//g;
				}
				elsif (defined $3) {
					$val=$3;
				}
				elsif (defined $4) {
					$val=$4;
				}

				if (defined $key) {
					push @params, $key, $val;
				}
				else {
					push @params, $val, '';
				}
			}
			if ($preprocessing{$page}++ > 3) {
				# Avoid loops of preprocessed pages preprocessing
				# other pages that preprocess them, etc.
				return "[[$command preprocessing loop detected on $page at depth $preprocessing{$page}]]";
			}
			my $ret=$hooks{preprocess}{$command}{call}->(
				@params,
				page => $page,
				destpage => $destpage,
			);
			$preprocessing{$page}--;
			return $ret;
		}
		else {
			return "[[$command $params]]";
		}
	};
	
	$content =~ s{(\\?)\[\[(\w+)\s+((?:(?:\w+=)?(?:""".*?"""|"[^"]+"|[^\s\]]+)\s*)*)\]\]}{$handle->($1, $2, $3)}seg;
	return $content;
} #}}}

sub filter ($$) { #{{{
	my $page=shift;
	my $content=shift;

	run_hooks(filter => sub {
		$content=shift->(page => $page, content => $content);
	});

	return $content;
} #}}}

sub indexlink () { #{{{
	return "<a href=\"$config{url}\">$config{wikiname}</a>";
} #}}}

sub lockwiki () { #{{{
	# Take an exclusive lock on the wiki to prevent multiple concurrent
	# run issues. The lock will be dropped on program exit.
	if (! -d $config{wikistatedir}) {
		mkdir($config{wikistatedir});
	}
	open(WIKILOCK, ">$config{wikistatedir}/lockfile") ||
		error ("cannot write to $config{wikistatedir}/lockfile: $!");
	if (! flock(WIKILOCK, 2 | 4)) {
		debug("wiki seems to be locked, waiting for lock");
		my $wait=600; # arbitrary, but don't hang forever to 
		              # prevent process pileup
		for (1..600) {
			return if flock(WIKILOCK, 2 | 4);
			sleep 1;
		}
		error("wiki is locked; waited $wait seconds without lock being freed (possible stuck process or stale lock?)");
	}
} #}}}

sub unlockwiki () { #{{{
	close WIKILOCK;
} #}}}

sub loadindex () { #{{{
	open (IN, "$config{wikistatedir}/index") || return;
	while (<IN>) {
		$_=possibly_foolish_untaint($_);
		chomp;
		my %items;
		$items{link}=[];
		$items{dest}=[];
		foreach my $i (split(/ /, $_)) {
			my ($item, $val)=split(/=/, $i, 2);
			push @{$items{$item}}, decode_entities($val);
		}

		next unless exists $items{src}; # skip bad lines for now

		my $page=pagename($items{src}[0]);
		if (! $config{rebuild}) {
			$pagesources{$page}=$items{src}[0];
			$oldpagemtime{$page}=$items{mtime}[0];
			$oldlinks{$page}=[@{$items{link}}];
			$links{$page}=[@{$items{link}}];
			$depends{$page}=$items{depends}[0] if exists $items{depends};
			$renderedfiles{$page}=[@{$items{dest}}];
			$oldrenderedfiles{$page}=[@{$items{dest}}];
			$pagecase{lc $page}=$page;
		}
		$pagectime{$page}=$items{ctime}[0];
	}
	close IN;
} #}}}

sub saveindex () { #{{{
	run_hooks(savestate => sub { shift->() });

	if (! -d $config{wikistatedir}) {
		mkdir($config{wikistatedir});
	}
	open (OUT, ">$config{wikistatedir}/index") || 
		error("cannot write to $config{wikistatedir}/index: $!");
	foreach my $page (keys %oldpagemtime) {
		next unless $oldpagemtime{$page};
		my $line="mtime=$oldpagemtime{$page} ".
			"ctime=$pagectime{$page} ".
			"src=$pagesources{$page}";
		$line.=" dest=$_" foreach @{$renderedfiles{$page}};
		my %count;
		$line.=" link=$_" foreach grep { ++$count{$_} == 1 } @{$links{$page}};
		if (exists $depends{$page}) {
			$line.=" depends=".encode_entities($depends{$page}, " \t\n");
		}
		print OUT $line."\n";
	}
	close OUT;
} #}}}

sub template_params (@) { #{{{
	my $filename=shift;
	
	require HTML::Template;
	return filter => sub {
			my $text_ref = shift;
			$$text_ref=&Encode::decode_utf8($$text_ref);
		},
		filename => "$config{templatedir}/$filename",
		loop_context_vars => 1,
		die_on_bad_params => 0,
		@_;
} #}}}

sub template ($;@) { #{{{
	HTML::Template->new(template_params(@_));
} #}}}

sub misctemplate ($$;@) { #{{{
	my $title=shift;
	my $pagebody=shift;
	
	my $template=template("misc.tmpl");
	$template->param(
		title => $title,
		indexlink => indexlink(),
		wikiname => $config{wikiname},
		pagebody => $pagebody,
		baseurl => baseurl(),
		@_,
	);
	run_hooks(pagetemplate => sub {
		shift->(page => "", destpage => "", template => $template);
	});
	return $template->output;
}#}}}

sub hook (@) { # {{{
	my %param=@_;
	
	if (! exists $param{type} || ! ref $param{call} || ! exists $param{id}) {
		error "hook requires type, call, and id parameters";
	}

	return if $param{no_override} && exists $hooks{$param{type}}{$param{id}};
	
	$hooks{$param{type}}{$param{id}}=\%param;
} # }}}

sub run_hooks ($$) { # {{{
	# Calls the given sub for each hook of the given type,
	# passing it the hook function to call.
	my $type=shift;
	my $sub=shift;

	if (exists $hooks{$type}) {
		my @deferred;
		foreach my $id (keys %{$hooks{$type}}) {
			if ($hooks{$type}{$id}{last}) {
				push @deferred, $id;
				next;
			}
			$sub->($hooks{$type}{$id}{call});
		}
		foreach my $id (@deferred) {
			$sub->($hooks{$type}{$id}{call});
		}
	}
} #}}}

sub globlist_to_pagespec ($) { #{{{
	my @globlist=split(' ', shift);

	my (@spec, @skip);
	foreach my $glob (@globlist) {
		if ($glob=~/^!(.*)/) {
			push @skip, $glob;
		}
		else {
			push @spec, $glob;
		}
	}

	my $spec=join(" or ", @spec);
	if (@skip) {
		my $skip=join(" and ", @skip);
		if (length $spec) {
			$spec="$skip and ($spec)";
		}
		else {
			$spec=$skip;
		}
	}
	return $spec;
} #}}}

sub is_globlist ($) { #{{{
	my $s=shift;
	$s=~/[^\s]+\s+([^\s]+)/ && $1 ne "and" && $1 ne "or";
} #}}}

sub safequote ($) { #{{{
	my $s=shift;
	$s=~s/[{}]//g;
	return "q{$s}";
} #}}}

sub pagespec_merge ($$) { #{{{
	my $a=shift;
	my $b=shift;

	return $a if $a eq $b;

        # Support for old-style GlobLists.
        if (is_globlist($a)) {
                $a=globlist_to_pagespec($a);
        }
        if (is_globlist($b)) {
                $b=globlist_to_pagespec($b);
        }

	return "($a) or ($b)";
} #}}}

sub pagespec_translate ($) { #{{{
	# This assumes that $page is in scope in the function
	# that evalulates the translated pagespec code.
	my $spec=shift;

	# Support for old-style GlobLists.
	if (is_globlist($spec)) {
		$spec=globlist_to_pagespec($spec);
	}

	# Convert spec to perl code.
	my $code="";
	while ($spec=~m/\s*(\!|\(|\)|\w+\([^\)]+\)|[^\s()]+)\s*/ig) {
		my $word=$1;
		if (lc $word eq "and") {
			$code.=" &&";
		}
		elsif (lc $word eq "or") {
			$code.=" ||";
		}
		elsif ($word eq "(" || $word eq ")" || $word eq "!") {
			$code.=" ".$word;
		}
		elsif ($word =~ /^(link|backlink|created_before|created_after|creation_month|creation_year|creation_day)\((.+)\)$/) {
			$code.=" match_$1(\$page, ".safequote($2).")";
		}
		else {
			$code.=" match_glob(\$page, ".safequote($word).")";
		}
	}

	return $code;
} #}}}

sub add_depends ($$) { #{{{
	my $page=shift;
	my $pagespec=shift;
	
	if (! exists $depends{$page}) {
		$depends{$page}=$pagespec;
	}
	else {
		$depends{$page}=pagespec_merge($depends{$page}, $pagespec);
	}
} # }}}

sub file_pruned ($$) { #{{{
	require File::Spec;
	my $file=File::Spec->canonpath(shift);
	my $base=File::Spec->canonpath(shift);
	$file=~s#^\Q$base\E/*##;

	my $regexp='('.join('|', @{$config{wiki_file_prune_regexps}}).')';
	$file =~ m/$regexp/;
} #}}}

sub pagespec_match ($$) { #{{{
	my $page=shift;
	my $spec=shift;

	return eval pagespec_translate($spec);
} #}}}

sub match_glob ($$) { #{{{
	my $page=shift;
	my $glob=shift;

	# turn glob into safe regexp
	$glob=quotemeta($glob);
	$glob=~s/\\\*/.*/g;
	$glob=~s/\\\?/./g;

	return $page=~/^$glob$/i;
} #}}}

sub match_link ($$) { #{{{
	my $page=shift;
	my $link=lc(shift);

	my $links = $links{$page} or return undef;
	foreach my $p (@$links) {
		return 1 if lc $p eq $link;
	}
	return 0;
} #}}}

sub match_backlink ($$) { #{{{
	match_link(pop, pop);
} #}}}

sub match_created_before ($$) { #{{{
	my $page=shift;
	my $testpage=shift;

	if (exists $pagectime{$testpage}) {
		return $pagectime{$page} < $pagectime{$testpage};
	}
	else {
		return 0;
	}
} #}}}

sub match_created_after ($$) { #{{{
	my $page=shift;
	my $testpage=shift;

	if (exists $pagectime{$testpage}) {
		return $pagectime{$page} > $pagectime{$testpage};
	}
	else {
		return 0;
	}
} #}}}

sub match_creation_day ($$) { #{{{
	return ((gmtime($pagectime{shift()}))[3] == shift);
} #}}}

sub match_creation_month ($$) { #{{{
	return ((gmtime($pagectime{shift()}))[4] + 1 == shift);
} #}}}

sub match_creation_year ($$) { #{{{
	return ((gmtime($pagectime{shift()}))[5] + 1900 == shift);
} #}}}

1