Merge remote branch 'upstream/filter-full' into prv/po
[ikiwiki.git] / IkiWiki.pm
1 #!/usr/bin/perl
2
3 package IkiWiki;
4
5 use warnings;
6 use strict;
7 use Encode;
8 use URI::Escape q{uri_escape_utf8};
9 use POSIX ();
10 use Storable;
11 use open qw{:utf8 :std};
12
13 use vars qw{%config %links %oldlinks %pagemtime %pagectime %pagecase
14         %pagestate %wikistate %renderedfiles %oldrenderedfiles
15         %pagesources %delpagesources %destsources %depends %depends_simple
16         @mass_depends %hooks %forcerebuild %loaded_plugins %typedlinks
17         %oldtypedlinks %autofiles};
18
19 use Exporter q{import};
20 our @EXPORT = qw(hook debug error htmlpage template template_depends
21         deptype add_depends pagespec_match pagespec_match_list bestlink
22         htmllink readfile writefile pagetype srcfile pagename
23         displaytime will_render gettext ngettext urlto targetpage
24         add_underlay pagetitle titlepage linkpage newpagefile
25         inject add_link add_autofile
26         %config %links %pagestate %wikistate %renderedfiles
27         %pagesources %destsources %typedlinks);
28 our $VERSION = 3.00; # plugin interface version, next is ikiwiki version
29 our $version='unknown'; # VERSION_AUTOREPLACE done by Makefile, DNE
30 our $installdir='/usr'; # INSTALLDIR_AUTOREPLACE done by Makefile, DNE
31
32 # Page dependency types.
33 our $DEPEND_CONTENT=1;
34 our $DEPEND_PRESENCE=2;
35 our $DEPEND_LINKS=4;
36
37 # Optimisation.
38 use Memoize;
39 memoize("abs2rel");
40 memoize("sortspec_translate");
41 memoize("pagespec_translate");
42 memoize("template_file");
43
44 sub getsetup () {
45         wikiname => {
46                 type => "string",
47                 default => "wiki",
48                 description => "name of the wiki",
49                 safe => 1,
50                 rebuild => 1,
51         },
52         adminemail => {
53                 type => "string",
54                 default => undef,
55                 example => 'me@example.com',
56                 description => "contact email for wiki",
57                 safe => 1,
58                 rebuild => 0,
59         },
60         adminuser => {
61                 type => "string",
62                 default => [],
63                 description => "users who are wiki admins",
64                 safe => 1,
65                 rebuild => 0,
66         },
67         banned_users => {
68                 type => "string",
69                 default => [],
70                 description => "users who are banned from the wiki",
71                 safe => 1,
72                 rebuild => 0,
73         },
74         srcdir => {
75                 type => "string",
76                 default => undef,
77                 example => "$ENV{HOME}/wiki",
78                 description => "where the source of the wiki is located",
79                 safe => 0, # path
80                 rebuild => 1,
81         },
82         destdir => {
83                 type => "string",
84                 default => undef,
85                 example => "/var/www/wiki",
86                 description => "where to build the wiki",
87                 safe => 0, # path
88                 rebuild => 1,
89         },
90         url => {
91                 type => "string",
92                 default => '',
93                 example => "http://example.com/wiki",
94                 description => "base url to the wiki",
95                 safe => 1,
96                 rebuild => 1,
97         },
98         cgiurl => {
99                 type => "string",
100                 default => '',
101                 example => "http://example.com/wiki/ikiwiki.cgi",
102                 description => "url to the ikiwiki.cgi",
103                 safe => 1,
104                 rebuild => 1,
105         },
106         cgi_wrapper => {
107                 type => "string",
108                 default => '',
109                 example => "/var/www/wiki/ikiwiki.cgi",
110                 description => "filename of cgi wrapper to generate",
111                 safe => 0, # file
112                 rebuild => 0,
113         },
114         cgi_wrappermode => {
115                 type => "string",
116                 default => '06755',
117                 description => "mode for cgi_wrapper (can safely be made suid)",
118                 safe => 0,
119                 rebuild => 0,
120         },
121         rcs => {
122                 type => "string",
123                 default => '',
124                 description => "rcs backend to use",
125                 safe => 0, # don't allow overriding
126                 rebuild => 0,
127         },
128         default_plugins => {
129                 type => "internal",
130                 default => [qw{mdwn link inline meta htmlscrubber passwordauth
131                                 openid signinedit lockedit conditional
132                                 recentchanges parentlinks editpage}],
133                 description => "plugins to enable by default",
134                 safe => 0,
135                 rebuild => 1,
136         },
137         add_plugins => {
138                 type => "string",
139                 default => [],
140                 description => "plugins to add to the default configuration",
141                 safe => 1,
142                 rebuild => 1,
143         },
144         disable_plugins => {
145                 type => "string",
146                 default => [],
147                 description => "plugins to disable",
148                 safe => 1,
149                 rebuild => 1,
150         },
151         templatedir => {
152                 type => "string",
153                 default => "$installdir/share/ikiwiki/templates",
154                 description => "additional directory to search for template files",
155                 advanced => 1,
156                 safe => 0, # path
157                 rebuild => 1,
158         },
159         underlaydir => {
160                 type => "string",
161                 default => "$installdir/share/ikiwiki/basewiki",
162                 description => "base wiki source location",
163                 advanced => 1,
164                 safe => 0, # path
165                 rebuild => 0,
166         },
167         underlaydirbase => {
168                 type => "internal",
169                 default => "$installdir/share/ikiwiki",
170                 description => "parent directory containing additional underlays",
171                 safe => 0,
172                 rebuild => 0,
173         },
174         wrappers => {
175                 type => "internal",
176                 default => [],
177                 description => "wrappers to generate",
178                 safe => 0,
179                 rebuild => 0,
180         },
181         underlaydirs => {
182                 type => "internal",
183                 default => [],
184                 description => "additional underlays to use",
185                 safe => 0,
186                 rebuild => 0,
187         },
188         verbose => {
189                 type => "boolean",
190                 example => 1,
191                 description => "display verbose messages?",
192                 safe => 1,
193                 rebuild => 0,
194         },
195         syslog => {
196                 type => "boolean",
197                 example => 1,
198                 description => "log to syslog?",
199                 safe => 1,
200                 rebuild => 0,
201         },
202         usedirs => {
203                 type => "boolean",
204                 default => 1,
205                 description => "create output files named page/index.html?",
206                 safe => 0, # changing requires manual transition
207                 rebuild => 1,
208         },
209         prefix_directives => {
210                 type => "boolean",
211                 default => 1,
212                 description => "use '!'-prefixed preprocessor directives?",
213                 safe => 0, # changing requires manual transition
214                 rebuild => 1,
215         },
216         indexpages => {
217                 type => "boolean",
218                 default => 0,
219                 description => "use page/index.mdwn source files",
220                 safe => 1,
221                 rebuild => 1,
222         },
223         discussion => {
224                 type => "boolean",
225                 default => 1,
226                 description => "enable Discussion pages?",
227                 safe => 1,
228                 rebuild => 1,
229         },
230         discussionpage => {
231                 type => "string",
232                 default => gettext("Discussion"),
233                 description => "name of Discussion pages",
234                 safe => 1,
235                 rebuild => 1,
236         },
237         html5 => {
238                 type => "boolean",
239                 default => 0,
240                 description => "generate HTML5? (experimental)",
241                 advanced => 1,
242                 safe => 1,
243                 rebuild => 1,
244         },
245         sslcookie => {
246                 type => "boolean",
247                 default => 0,
248                 description => "only send cookies over SSL connections?",
249                 advanced => 1,
250                 safe => 1,
251                 rebuild => 0,
252         },
253         default_pageext => {
254                 type => "string",
255                 default => "mdwn",
256                 description => "extension to use for new pages",
257                 safe => 0, # not sanitized
258                 rebuild => 0,
259         },
260         htmlext => {
261                 type => "string",
262                 default => "html",
263                 description => "extension to use for html files",
264                 safe => 0, # not sanitized
265                 rebuild => 1,
266         },
267         timeformat => {
268                 type => "string",
269                 default => '%c',
270                 description => "strftime format string to display date",
271                 advanced => 1,
272                 safe => 1,
273                 rebuild => 1,
274         },
275         locale => {
276                 type => "string",
277                 default => undef,
278                 example => "en_US.UTF-8",
279                 description => "UTF-8 locale to use",
280                 advanced => 1,
281                 safe => 0,
282                 rebuild => 1,
283         },
284         userdir => {
285                 type => "string",
286                 default => "",
287                 example => "users",
288                 description => "put user pages below specified page",
289                 safe => 1,
290                 rebuild => 1,
291         },
292         numbacklinks => {
293                 type => "integer",
294                 default => 10,
295                 description => "how many backlinks to show before hiding excess (0 to show all)",
296                 safe => 1,
297                 rebuild => 1,
298         },
299         hardlink => {
300                 type => "boolean",
301                 default => 0,
302                 description => "attempt to hardlink source files? (optimisation for large files)",
303                 advanced => 1,
304                 safe => 0, # paranoia
305                 rebuild => 0,
306         },
307         umask => {
308                 type => "integer",
309                 example => "022",
310                 description => "force ikiwiki to use a particular umask",
311                 advanced => 1,
312                 safe => 0, # paranoia
313                 rebuild => 0,
314         },
315         wrappergroup => {
316                 type => "string",
317                 example => "ikiwiki",
318                 description => "group for wrappers to run in",
319                 advanced => 1,
320                 safe => 0, # paranoia
321                 rebuild => 0,
322         },
323         libdir => {
324                 type => "string",
325                 default => "",
326                 example => "$ENV{HOME}/.ikiwiki/",
327                 description => "extra library and plugin directory",
328                 advanced => 1,
329                 safe => 0, # directory
330                 rebuild => 0,
331         },
332         ENV => {
333                 type => "string", 
334                 default => {},
335                 description => "environment variables",
336                 safe => 0, # paranoia
337                 rebuild => 0,
338         },
339         include => {
340                 type => "string",
341                 default => undef,
342                 example => '^\.htaccess$',
343                 description => "regexp of normally excluded files to include",
344                 advanced => 1,
345                 safe => 0, # regexp
346                 rebuild => 1,
347         },
348         exclude => {
349                 type => "string",
350                 default => undef,
351                 example => '^(*\.private|Makefile)$',
352                 description => "regexp of files that should be skipped",
353                 advanced => 1,
354                 safe => 0, # regexp
355                 rebuild => 1,
356         },
357         wiki_file_prune_regexps => {
358                 type => "internal",
359                 default => [qr/(^|\/)\.\.(\/|$)/, qr/^\//, qr/^\./, qr/\/\./,
360                         qr/\.x?html?$/, qr/\.ikiwiki-new$/,
361                         qr/(^|\/).svn\//, qr/.arch-ids\//, qr/{arch}\//,
362                         qr/(^|\/)_MTN\//, qr/(^|\/)_darcs\//,
363                         qr/(^|\/)CVS\//, qr/\.dpkg-tmp$/],
364                 description => "regexps of source files to ignore",
365                 safe => 0,
366                 rebuild => 1,
367         },
368         wiki_file_chars => {
369                 type => "string",
370                 description => "specifies the characters that are allowed in source filenames",
371                 default => "-[:alnum:]+/.:_",
372                 safe => 0,
373                 rebuild => 1,
374         },
375         wiki_file_regexp => {
376                 type => "internal",
377                 description => "regexp of legal source files",
378                 safe => 0,
379                 rebuild => 1,
380         },
381         web_commit_regexp => {
382                 type => "internal",
383                 default => qr/^web commit (by (.*?(?=: |$))|from ([0-9a-fA-F:.]+[0-9a-fA-F])):?(.*)/,
384                 description => "regexp to parse web commits from logs",
385                 safe => 0,
386                 rebuild => 0,
387         },
388         cgi => {
389                 type => "internal",
390                 default => 0,
391                 description => "run as a cgi",
392                 safe => 0,
393                 rebuild => 0,
394         },
395         cgi_disable_uploads => {
396                 type => "internal",
397                 default => 1,
398                 description => "whether CGI should accept file uploads",
399                 safe => 0,
400                 rebuild => 0,
401         },
402         post_commit => {
403                 type => "internal",
404                 default => 0,
405                 description => "run as a post-commit hook",
406                 safe => 0,
407                 rebuild => 0,
408         },
409         rebuild => {
410                 type => "internal",
411                 default => 0,
412                 description => "running in rebuild mode",
413                 safe => 0,
414                 rebuild => 0,
415         },
416         setup => {
417                 type => "internal",
418                 default => undef,
419                 description => "running in setup mode",
420                 safe => 0,
421                 rebuild => 0,
422         },
423         clean => {
424                 type => "internal",
425                 default => 0,
426                 description => "running in clean mode",
427                 safe => 0,
428                 rebuild => 0,
429         },
430         refresh => {
431                 type => "internal",
432                 default => 0,
433                 description => "running in refresh mode",
434                 safe => 0,
435                 rebuild => 0,
436         },
437         test_receive => {
438                 type => "internal",
439                 default => 0,
440                 description => "running in receive test mode",
441                 safe => 0,
442                 rebuild => 0,
443         },
444         wrapper_background_command => {
445                 type => "internal",
446                 default => '',
447                 description => "background shell command to run",
448                 safe => 0,
449                 rebuild => 0,
450         },
451         gettime => {
452                 type => "internal",
453                 description => "running in gettime mode",
454                 safe => 0,
455                 rebuild => 0,
456         },
457         w3mmode => {
458                 type => "internal",
459                 default => 0,
460                 description => "running in w3mmode",
461                 safe => 0,
462                 rebuild => 0,
463         },
464         wikistatedir => {
465                 type => "internal",
466                 default => undef,
467                 description => "path to the .ikiwiki directory holding ikiwiki state",
468                 safe => 0,
469                 rebuild => 0,
470         },
471         setupfile => {
472                 type => "internal",
473                 default => undef,
474                 description => "path to setup file",
475                 safe => 0,
476                 rebuild => 0,
477         },
478         setuptype => {
479                 type => "internal",
480                 default => "Standard",
481                 description => "perl class to use to dump setup file",
482                 safe => 0,
483                 rebuild => 0,
484         },
485         allow_symlinks_before_srcdir => {
486                 type => "boolean",
487                 default => 0,
488                 description => "allow symlinks in the path leading to the srcdir (potentially insecure)",
489                 safe => 0,
490                 rebuild => 0,
491         },
492 }
493
494 sub defaultconfig () {
495         my %s=getsetup();
496         my @ret;
497         foreach my $key (keys %s) {
498                 push @ret, $key, $s{$key}->{default};
499         }
500         use Data::Dumper;
501         return @ret;
502 }
503
504 sub checkconfig () {
505         # locale stuff; avoid LC_ALL since it overrides everything
506         if (defined $ENV{LC_ALL}) {
507                 $ENV{LANG} = $ENV{LC_ALL};
508                 delete $ENV{LC_ALL};
509         }
510         if (defined $config{locale}) {
511                 if (POSIX::setlocale(&POSIX::LC_ALL, $config{locale})) {
512                         $ENV{LANG}=$config{locale};
513                         define_gettext();
514                 }
515         }
516                 
517         if (! defined $config{wiki_file_regexp}) {
518                 $config{wiki_file_regexp}=qr/(^[$config{wiki_file_chars}]+$)/;
519         }
520
521         if (ref $config{ENV} eq 'HASH') {
522                 foreach my $val (keys %{$config{ENV}}) {
523                         $ENV{$val}=$config{ENV}{$val};
524                 }
525         }
526
527         if ($config{w3mmode}) {
528                 eval q{use Cwd q{abs_path}};
529                 error($@) if $@;
530                 $config{srcdir}=possibly_foolish_untaint(abs_path($config{srcdir}));
531                 $config{destdir}=possibly_foolish_untaint(abs_path($config{destdir}));
532                 $config{cgiurl}="file:///\$LIB/ikiwiki-w3m.cgi/".$config{cgiurl}
533                         unless $config{cgiurl} =~ m!file:///!;
534                 $config{url}="file://".$config{destdir};
535         }
536
537         if ($config{cgi} && ! length $config{url}) {
538                 error(gettext("Must specify url to wiki with --url when using --cgi"));
539         }
540         
541         $config{wikistatedir}="$config{srcdir}/.ikiwiki"
542                 unless exists $config{wikistatedir} && defined $config{wikistatedir};
543
544         if (defined $config{umask}) {
545                 umask(possibly_foolish_untaint($config{umask}));
546         }
547
548         run_hooks(checkconfig => sub { shift->() });
549
550         return 1;
551 }
552
553 sub listplugins () {
554         my %ret;
555
556         foreach my $dir (@INC, $config{libdir}) {
557                 next unless defined $dir && length $dir;
558                 foreach my $file (glob("$dir/IkiWiki/Plugin/*.pm")) {
559                         my ($plugin)=$file=~/.*\/(.*)\.pm$/;
560                         $ret{$plugin}=1;
561                 }
562         }
563         foreach my $dir ($config{libdir}, "$installdir/lib/ikiwiki") {
564                 next unless defined $dir && length $dir;
565                 foreach my $file (glob("$dir/plugins/*")) {
566                         $ret{basename($file)}=1 if -x $file;
567                 }
568         }
569
570         return keys %ret;
571 }
572
573 sub loadplugins () {
574         if (defined $config{libdir} && length $config{libdir}) {
575                 unshift @INC, possibly_foolish_untaint($config{libdir});
576         }
577
578         foreach my $plugin (@{$config{default_plugins}}, @{$config{add_plugins}}) {
579                 loadplugin($plugin);
580         }
581         
582         if ($config{rcs}) {
583                 if (exists $hooks{rcs}) {
584                         error(gettext("cannot use multiple rcs plugins"));
585                 }
586                 loadplugin($config{rcs});
587         }
588         if (! exists $hooks{rcs}) {
589                 loadplugin("norcs");
590         }
591
592         run_hooks(getopt => sub { shift->() });
593         if (grep /^-/, @ARGV) {
594                 print STDERR "Unknown option (or missing parameter): $_\n"
595                         foreach grep /^-/, @ARGV;
596                 usage();
597         }
598
599         return 1;
600 }
601
602 sub loadplugin ($;$) {
603         my $plugin=shift;
604         my $force=shift;
605
606         return if ! $force && grep { $_ eq $plugin} @{$config{disable_plugins}};
607
608         foreach my $dir (defined $config{libdir} ? possibly_foolish_untaint($config{libdir}) : undef,
609                          "$installdir/lib/ikiwiki") {
610                 if (defined $dir && -x "$dir/plugins/$plugin") {
611                         eval { require IkiWiki::Plugin::external };
612                         if ($@) {
613                                 my $reason=$@;
614                                 error(sprintf(gettext("failed to load external plugin needed for %s plugin: %s"), $plugin, $reason));
615                         }
616                         import IkiWiki::Plugin::external "$dir/plugins/$plugin";
617                         $loaded_plugins{$plugin}=1;
618                         return 1;
619                 }
620         }
621
622         my $mod="IkiWiki::Plugin::".possibly_foolish_untaint($plugin);
623         eval qq{use $mod};
624         if ($@) {
625                 error("Failed to load plugin $mod: $@");
626         }
627         $loaded_plugins{$plugin}=1;
628         return 1;
629 }
630
631 sub error ($;$) {
632         my $message=shift;
633         my $cleaner=shift;
634         log_message('err' => $message) if $config{syslog};
635         if (defined $cleaner) {
636                 $cleaner->();
637         }
638         die $message."\n";
639 }
640
641 sub debug ($) {
642         return unless $config{verbose};
643         return log_message(debug => @_);
644 }
645
646 my $log_open=0;
647 sub log_message ($$) {
648         my $type=shift;
649
650         if ($config{syslog}) {
651                 require Sys::Syslog;
652                 if (! $log_open) {
653                         Sys::Syslog::setlogsock('unix');
654                         Sys::Syslog::openlog('ikiwiki', '', 'user');
655                         $log_open=1;
656                 }
657                 return eval {
658                         Sys::Syslog::syslog($type, "[$config{wikiname}] %s", join(" ", @_));
659                 };
660         }
661         elsif (! $config{cgi}) {
662                 return print "@_\n";
663         }
664         else {
665                 return print STDERR "@_\n";
666         }
667 }
668
669 sub possibly_foolish_untaint ($) {
670         my $tainted=shift;
671         my ($untainted)=$tainted=~/(.*)/s;
672         return $untainted;
673 }
674
675 sub basename ($) {
676         my $file=shift;
677
678         $file=~s!.*/+!!;
679         return $file;
680 }
681
682 sub dirname ($) {
683         my $file=shift;
684
685         $file=~s!/*[^/]+$!!;
686         return $file;
687 }
688
689 sub isinternal ($) {
690         my $page=shift;
691         return exists $pagesources{$page} &&
692                 $pagesources{$page} =~ /\._([^.]+)$/;
693 }
694
695 sub pagetype ($) {
696         my $file=shift;
697         
698         if ($file =~ /\.([^.]+)$/) {
699                 return $1 if exists $hooks{htmlize}{$1};
700         }
701         my $base=basename($file);
702         if (exists $hooks{htmlize}{$base} &&
703             $hooks{htmlize}{$base}{noextension}) {
704                 return $base;
705         }
706         return;
707 }
708
709 my %pagename_cache;
710
711 sub pagename ($) {
712         my $file=shift;
713
714         if (exists $pagename_cache{$file}) {
715                 return $pagename_cache{$file};
716         }
717
718         my $type=pagetype($file);
719         my $page=$file;
720         $page=~s/\Q.$type\E*$//
721                 if defined $type && !$hooks{htmlize}{$type}{keepextension}
722                         && !$hooks{htmlize}{$type}{noextension};
723         if ($config{indexpages} && $page=~/(.*)\/index$/) {
724                 $page=$1;
725         }
726
727         $pagename_cache{$file} = $page;
728         return $page;
729 }
730
731 sub newpagefile ($$) {
732         my $page=shift;
733         my $type=shift;
734
735         if (! $config{indexpages} || $page eq 'index') {
736                 return $page.".".$type;
737         }
738         else {
739                 return $page."/index.".$type;
740         }
741 }
742
743 sub targetpage ($$;$) {
744         my $page=shift;
745         my $ext=shift;
746         my $filename=shift;
747         
748         if (defined $filename) {
749                 return $page."/".$filename.".".$ext;
750         }
751         elsif (! $config{usedirs} || $page eq 'index') {
752                 return $page.".".$ext;
753         }
754         else {
755                 return $page."/index.".$ext;
756         }
757 }
758
759 sub htmlpage ($) {
760         my $page=shift;
761         
762         return targetpage($page, $config{htmlext});
763 }
764
765 sub srcfile_stat {
766         my $file=shift;
767         my $nothrow=shift;
768
769         return "$config{srcdir}/$file", stat(_) if -e "$config{srcdir}/$file";
770         foreach my $dir (@{$config{underlaydirs}}, $config{underlaydir}) {
771                 return "$dir/$file", stat(_) if -e "$dir/$file";
772         }
773         error("internal error: $file cannot be found in $config{srcdir} or underlay") unless $nothrow;
774         return;
775 }
776
777 sub srcfile ($;$) {
778         return (srcfile_stat(@_))[0];
779 }
780
781 sub add_underlay ($) {
782         my $dir=shift;
783
784         if ($dir !~ /^\//) {
785                 $dir="$config{underlaydirbase}/$dir";
786         }
787
788         if (! grep { $_ eq $dir } @{$config{underlaydirs}}) {
789                 unshift @{$config{underlaydirs}}, $dir;
790         }
791
792         return 1;
793 }
794
795 sub readfile ($;$$) {
796         my $file=shift;
797         my $binary=shift;
798         my $wantfd=shift;
799
800         if (-l $file) {
801                 error("cannot read a symlink ($file)");
802         }
803         
804         local $/=undef;
805         open (my $in, "<", $file) || error("failed to read $file: $!");
806         binmode($in) if ($binary);
807         return \*$in if $wantfd;
808         my $ret=<$in>;
809         # check for invalid utf-8, and toss it back to avoid crashes
810         if (! utf8::valid($ret)) {
811                 $ret=encode_utf8($ret);
812         }
813         close $in || error("failed to read $file: $!");
814         return $ret;
815 }
816
817 sub prep_writefile ($$) {
818         my $file=shift;
819         my $destdir=shift;
820         
821         my $test=$file;
822         while (length $test) {
823                 if (-l "$destdir/$test") {
824                         error("cannot write to a symlink ($test)");
825                 }
826                 $test=dirname($test);
827         }
828
829         my $dir=dirname("$destdir/$file");
830         if (! -d $dir) {
831                 my $d="";
832                 foreach my $s (split(m!/+!, $dir)) {
833                         $d.="$s/";
834                         if (! -d $d) {
835                                 mkdir($d) || error("failed to create directory $d: $!");
836                         }
837                 }
838         }
839
840         return 1;
841 }
842
843 sub writefile ($$$;$$) {
844         my $file=shift; # can include subdirs
845         my $destdir=shift; # directory to put file in
846         my $content=shift;
847         my $binary=shift;
848         my $writer=shift;
849         
850         prep_writefile($file, $destdir);
851         
852         my $newfile="$destdir/$file.ikiwiki-new";
853         if (-l $newfile) {
854                 error("cannot write to a symlink ($newfile)");
855         }
856         
857         my $cleanup = sub { unlink($newfile) };
858         open (my $out, '>', $newfile) || error("failed to write $newfile: $!", $cleanup);
859         binmode($out) if ($binary);
860         if ($writer) {
861                 $writer->(\*$out, $cleanup);
862         }
863         else {
864                 print $out $content or error("failed writing to $newfile: $!", $cleanup);
865         }
866         close $out || error("failed saving $newfile: $!", $cleanup);
867         rename($newfile, "$destdir/$file") || 
868                 error("failed renaming $newfile to $destdir/$file: $!", $cleanup);
869
870         return 1;
871 }
872
873 my %cleared;
874 sub will_render ($$;$) {
875         my $page=shift;
876         my $dest=shift;
877         my $clear=shift;
878
879         # Important security check.
880         if (-e "$config{destdir}/$dest" && ! $config{rebuild} &&
881             ! grep { $_ eq $dest } (@{$renderedfiles{$page}}, @{$oldrenderedfiles{$page}}, @{$wikistate{editpage}{previews}})) {
882                 error("$config{destdir}/$dest independently created, not overwriting with version from $page");
883         }
884
885         if (! $clear || $cleared{$page}) {
886                 $renderedfiles{$page}=[$dest, grep { $_ ne $dest } @{$renderedfiles{$page}}];
887         }
888         else {
889                 foreach my $old (@{$renderedfiles{$page}}) {
890                         delete $destsources{$old};
891                 }
892                 $renderedfiles{$page}=[$dest];
893                 $cleared{$page}=1;
894         }
895         $destsources{$dest}=$page;
896
897         return 1;
898 }
899
900 sub bestlink ($$) {
901         my $page=shift;
902         my $link=shift;
903         
904         my $cwd=$page;
905         if ($link=~s/^\/+//) {
906                 # absolute links
907                 $cwd="";
908         }
909         $link=~s/\/$//;
910
911         do {
912                 my $l=$cwd;
913                 $l.="/" if length $l;
914                 $l.=$link;
915
916                 if (exists $pagesources{$l}) {
917                         return $l;
918                 }
919                 elsif (exists $pagecase{lc $l}) {
920                         return $pagecase{lc $l};
921                 }
922         } while $cwd=~s{/?[^/]+$}{};
923
924         if (length $config{userdir}) {
925                 my $l = "$config{userdir}/".lc($link);
926                 if (exists $pagesources{$l}) {
927                         return $l;
928                 }
929                 elsif (exists $pagecase{lc $l}) {
930                         return $pagecase{lc $l};
931                 }
932         }
933
934         #print STDERR "warning: page $page, broken link: $link\n";
935         return "";
936 }
937
938 sub isinlinableimage ($) {
939         my $file=shift;
940         
941         return $file =~ /\.(png|gif|jpg|jpeg)$/i;
942 }
943
944 sub pagetitle ($;$) {
945         my $page=shift;
946         my $unescaped=shift;
947
948         if ($unescaped) {
949                 $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : chr($2)/eg;
950         }
951         else {
952                 $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : "&#$2;"/eg;
953         }
954
955         return $page;
956 }
957
958 sub titlepage ($) {
959         my $title=shift;
960         # support use w/o %config set
961         my $chars = defined $config{wiki_file_chars} ? $config{wiki_file_chars} : "-[:alnum:]+/.:_";
962         $title=~s/([^$chars]|_)/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
963         return $title;
964 }
965
966 sub linkpage ($) {
967         my $link=shift;
968         my $chars = defined $config{wiki_file_chars} ? $config{wiki_file_chars} : "-[:alnum:]+/.:_";
969         $link=~s/([^$chars])/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
970         return $link;
971 }
972
973 sub cgiurl (@) {
974         my %params=@_;
975
976         my $cgiurl=$config{cgiurl};
977         if (exists $params{cgiurl}) {
978                 $cgiurl=$params{cgiurl};
979                 delete $params{cgiurl};
980         }
981         return $cgiurl."?".
982                 join("&amp;", map $_."=".uri_escape_utf8($params{$_}), keys %params);
983 }
984
985 sub baseurl (;$) {
986         my $page=shift;
987
988         return "$config{url}/" if ! defined $page;
989         
990         $page=htmlpage($page);
991         $page=~s/[^\/]+$//;
992         $page=~s/[^\/]+\//..\//g;
993         return $page;
994 }
995
996 sub abs2rel ($$) {
997         # Work around very innefficient behavior in File::Spec if abs2rel
998         # is passed two relative paths. It's much faster if paths are
999         # absolute! (Debian bug #376658; fixed in debian unstable now)
1000         my $path="/".shift;
1001         my $base="/".shift;
1002
1003         require File::Spec;
1004         my $ret=File::Spec->abs2rel($path, $base);
1005         $ret=~s/^// if defined $ret;
1006         return $ret;
1007 }
1008
1009 sub displaytime ($;$$) {
1010         # Plugins can override this function to mark up the time to
1011         # display.
1012         my $time=formattime($_[0], $_[1]);
1013         if ($config{html5}) {
1014                 return '<time datetime="'.date_3339($_[0]).'"'.
1015                         ($_[2] ? ' pubdate="pubdate"' : '').
1016                         '>'.$time.'</time>';
1017         }
1018         else {
1019                 return '<span class="date">'.$time.'</span>';
1020         }
1021 }
1022
1023 sub formattime ($;$) {
1024         # Plugins can override this function to format the time.
1025         my $time=shift;
1026         my $format=shift;
1027         if (! defined $format) {
1028                 $format=$config{timeformat};
1029         }
1030
1031         # strftime doesn't know about encodings, so make sure
1032         # its output is properly treated as utf8
1033         return decode_utf8(POSIX::strftime($format, localtime($time)));
1034 }
1035
1036 sub date_3339 ($) {
1037         my $time=shift;
1038
1039         my $lc_time=POSIX::setlocale(&POSIX::LC_TIME);
1040         POSIX::setlocale(&POSIX::LC_TIME, "C");
1041         my $ret=POSIX::strftime("%Y-%m-%dT%H:%M:%SZ", gmtime($time));
1042         POSIX::setlocale(&POSIX::LC_TIME, $lc_time);
1043         return $ret;
1044 }
1045
1046 sub beautify_urlpath ($) {
1047         my $url=shift;
1048
1049         # Ensure url is not an empty link, and if necessary,
1050         # add ./ to avoid colon confusion.
1051         if ($url !~ /^\// && $url !~ /^\.\.?\//) {
1052                 $url="./$url";
1053         }
1054
1055         if ($config{usedirs}) {
1056                 $url =~ s!/index.$config{htmlext}$!/!;
1057         }
1058
1059         return $url;
1060 }
1061
1062 sub urlto ($$;$) {
1063         my $to=shift;
1064         my $from=shift;
1065         my $absolute=shift;
1066         
1067         if (! length $to) {
1068                 return beautify_urlpath(baseurl($from)."index.$config{htmlext}");
1069         }
1070
1071         if (! $destsources{$to}) {
1072                 $to=htmlpage($to);
1073         }
1074
1075         if ($absolute) {
1076                 return $config{url}.beautify_urlpath("/".$to);
1077         }
1078
1079         my $link = abs2rel($to, dirname(htmlpage($from)));
1080
1081         return beautify_urlpath($link);
1082 }
1083
1084 sub isselflink ($$) {
1085         my $page=shift;
1086         my $link=shift;
1087
1088         return $page eq $link;
1089 }
1090
1091 sub htmllink ($$$;@) {
1092         my $lpage=shift; # the page doing the linking
1093         my $page=shift; # the page that will contain the link (different for inline)
1094         my $link=shift;
1095         my %opts=@_;
1096
1097         $link=~s/\/$//;
1098
1099         my $bestlink;
1100         if (! $opts{forcesubpage}) {
1101                 $bestlink=bestlink($lpage, $link);
1102         }
1103         else {
1104                 $bestlink="$lpage/".lc($link);
1105         }
1106
1107         my $linktext;
1108         if (defined $opts{linktext}) {
1109                 $linktext=$opts{linktext};
1110         }
1111         else {
1112                 $linktext=pagetitle(basename($link));
1113         }
1114         
1115         return "<span class=\"selflink\">$linktext</span>"
1116                 if length $bestlink && isselflink($page, $bestlink) &&
1117                    ! defined $opts{anchor};
1118         
1119         if (! $destsources{$bestlink}) {
1120                 $bestlink=htmlpage($bestlink);
1121
1122                 if (! $destsources{$bestlink}) {
1123                         my $cgilink = "";
1124                         if (length $config{cgiurl}) {
1125                                 $cgilink = "<a href=\"".
1126                                         cgiurl(
1127                                                 do => "create",
1128                                                 page => lc($link),
1129                                                 from => $lpage
1130                                         )."\" rel=\"nofollow\">?</a>";
1131                         }
1132                         return "<span class=\"createlink\">$cgilink$linktext</span>"
1133                 }
1134         }
1135         
1136         $bestlink=abs2rel($bestlink, dirname(htmlpage($page)));
1137         $bestlink=beautify_urlpath($bestlink);
1138         
1139         if (! $opts{noimageinline} && isinlinableimage($bestlink)) {
1140                 return "<img src=\"$bestlink\" alt=\"$linktext\" />";
1141         }
1142
1143         if (defined $opts{anchor}) {
1144                 $bestlink.="#".$opts{anchor};
1145         }
1146
1147         my @attrs;
1148         foreach my $attr (qw{rel class title}) {
1149                 if (defined $opts{$attr}) {
1150                         push @attrs, " $attr=\"$opts{$attr}\"";
1151                 }
1152         }
1153
1154         return "<a href=\"$bestlink\"@attrs>$linktext</a>";
1155 }
1156
1157 sub userpage ($) {
1158         my $user=shift;
1159         return length $config{userdir} ? "$config{userdir}/$user" : $user;
1160 }
1161
1162 sub openiduser ($) {
1163         my $user=shift;
1164
1165         if ($user =~ m!^https?://! &&
1166             eval q{use Net::OpenID::VerifiedIdentity; 1} && !$@) {
1167                 my $display;
1168
1169                 if (Net::OpenID::VerifiedIdentity->can("DisplayOfURL")) {
1170                         $display = Net::OpenID::VerifiedIdentity::DisplayOfURL($user);
1171                 }
1172                 else {
1173                         # backcompat with old version
1174                         my $oid=Net::OpenID::VerifiedIdentity->new(identity => $user);
1175                         $display=$oid->display;
1176                 }
1177
1178                 # Convert "user.somehost.com" to "user [somehost.com]"
1179                 # (also "user.somehost.co.uk")
1180                 if ($display !~ /\[/) {
1181                         $display=~s/^([-a-zA-Z0-9]+?)\.([-.a-zA-Z0-9]+\.[a-z]+)$/$1 [$2]/;
1182                 }
1183                 # Convert "http://somehost.com/user" to "user [somehost.com]".
1184                 # (also "https://somehost.com/user/")
1185                 if ($display !~ /\[/) {
1186                         $display=~s/^https?:\/\/(.+)\/([^\/#?]+)\/?(?:[#?].*)?$/$2 [$1]/;
1187                 }
1188                 $display=~s!^https?://!!; # make sure this is removed
1189                 eval q{use CGI 'escapeHTML'};
1190                 error($@) if $@;
1191                 return escapeHTML($display);
1192         }
1193         return;
1194 }
1195
1196 sub htmlize ($$$$) {
1197         my $page=shift;
1198         my $destpage=shift;
1199         my $type=shift;
1200         my $content=shift;
1201         
1202         my $oneline = $content !~ /\n/;
1203         
1204         if (exists $hooks{htmlize}{$type}) {
1205                 $content=$hooks{htmlize}{$type}{call}->(
1206                         page => $page,
1207                         content => $content,
1208                 );
1209         }
1210         else {
1211                 error("htmlization of $type not supported");
1212         }
1213
1214         run_hooks(sanitize => sub {
1215                 $content=shift->(
1216                         page => $page,
1217                         destpage => $destpage,
1218                         content => $content,
1219                 );
1220         });
1221         
1222         if ($oneline) {
1223                 # hack to get rid of enclosing junk added by markdown
1224                 # and other htmlizers/sanitizers
1225                 $content=~s/^<p>//i;
1226                 $content=~s/<\/p>\n*$//i;
1227         }
1228
1229         return $content;
1230 }
1231
1232 sub linkify ($$$) {
1233         my $page=shift;
1234         my $destpage=shift;
1235         my $content=shift;
1236
1237         run_hooks(linkify => sub {
1238                 $content=shift->(
1239                         page => $page,
1240                         destpage => $destpage,
1241                         content => $content,
1242                 );
1243         });
1244         
1245         return $content;
1246 }
1247
1248 our %preprocessing;
1249 our $preprocess_preview=0;
1250 sub preprocess ($$$;$$) {
1251         my $page=shift; # the page the data comes from
1252         my $destpage=shift; # the page the data will appear in (different for inline)
1253         my $content=shift;
1254         my $scan=shift;
1255         my $preview=shift;
1256
1257         # Using local because it needs to be set within any nested calls
1258         # of this function.
1259         local $preprocess_preview=$preview if defined $preview;
1260
1261         my $handle=sub {
1262                 my $escape=shift;
1263                 my $prefix=shift;
1264                 my $command=shift;
1265                 my $params=shift;
1266                 $params="" if ! defined $params;
1267
1268                 if (length $escape) {
1269                         return "[[$prefix$command $params]]";
1270                 }
1271                 elsif (exists $hooks{preprocess}{$command}) {
1272                         return "" if $scan && ! $hooks{preprocess}{$command}{scan};
1273                         # Note: preserve order of params, some plugins may
1274                         # consider it significant.
1275                         my @params;
1276                         while ($params =~ m{
1277                                 (?:([-\w]+)=)?          # 1: named parameter key?
1278                                 (?:
1279                                         """(.*?)"""     # 2: triple-quoted value
1280                                 |
1281                                         "([^"]*?)"      # 3: single-quoted value
1282                                 |
1283                                         (\S+)           # 4: unquoted value
1284                                 )
1285                                 (?:\s+|$)               # delimiter to next param
1286                         }sgx) {
1287                                 my $key=$1;
1288                                 my $val;
1289                                 if (defined $2) {
1290                                         $val=$2;
1291                                         $val=~s/\r\n/\n/mg;
1292                                         $val=~s/^\n+//g;
1293                                         $val=~s/\n+$//g;
1294                                 }
1295                                 elsif (defined $3) {
1296                                         $val=$3;
1297                                 }
1298                                 elsif (defined $4) {
1299                                         $val=$4;
1300                                 }
1301
1302                                 if (defined $key) {
1303                                         push @params, $key, $val;
1304                                 }
1305                                 else {
1306                                         push @params, $val, '';
1307                                 }
1308                         }
1309                         if ($preprocessing{$page}++ > 3) {
1310                                 # Avoid loops of preprocessed pages preprocessing
1311                                 # other pages that preprocess them, etc.
1312                                 return "[[!$command <span class=\"error\">".
1313                                         sprintf(gettext("preprocessing loop detected on %s at depth %i"),
1314                                                 $page, $preprocessing{$page}).
1315                                         "</span>]]";
1316                         }
1317                         my $ret;
1318                         if (! $scan) {
1319                                 $ret=eval {
1320                                         $hooks{preprocess}{$command}{call}->(
1321                                                 @params,
1322                                                 page => $page,
1323                                                 destpage => $destpage,
1324                                                 preview => $preprocess_preview,
1325                                         );
1326                                 };
1327                                 if ($@) {
1328                                         my $error=$@;
1329                                         chomp $error;
1330                                         $ret="[[!$command <span class=\"error\">".
1331                                                 gettext("Error").": $error"."</span>]]";
1332                                 }
1333                         }
1334                         else {
1335                                 # use void context during scan pass
1336                                 eval {
1337                                         $hooks{preprocess}{$command}{call}->(
1338                                                 @params,
1339                                                 page => $page,
1340                                                 destpage => $destpage,
1341                                                 preview => $preprocess_preview,
1342                                         );
1343                                 };
1344                                 $ret="";
1345                         }
1346                         $preprocessing{$page}--;
1347                         return $ret;
1348                 }
1349                 else {
1350                         return "[[$prefix$command $params]]";
1351                 }
1352         };
1353         
1354         my $regex;
1355         if ($config{prefix_directives}) {
1356                 $regex = qr{
1357                         (\\?)           # 1: escape?
1358                         \[\[(!)         # directive open; 2: prefix
1359                         ([-\w]+)        # 3: command
1360                         (               # 4: the parameters..
1361                                 \s+     # Must have space if parameters present
1362                                 (?:
1363                                         (?:[-\w]+=)?            # named parameter key?
1364                                         (?:
1365                                                 """.*?"""       # triple-quoted value
1366                                                 |
1367                                                 "[^"]*?"        # single-quoted value
1368                                                 |
1369                                                 [^"\s\]]+       # unquoted value
1370                                         )
1371                                         \s*                     # whitespace or end
1372                                                                 # of directive
1373                                 )
1374                         *)?             # 0 or more parameters
1375                         \]\]            # directive closed
1376                 }sx;
1377         }
1378         else {
1379                 $regex = qr{
1380                         (\\?)           # 1: escape?
1381                         \[\[(!?)        # directive open; 2: optional prefix
1382                         ([-\w]+)        # 3: command
1383                         \s+
1384                         (               # 4: the parameters..
1385                                 (?:
1386                                         (?:[-\w]+=)?            # named parameter key?
1387                                         (?:
1388                                                 """.*?"""       # triple-quoted value
1389                                                 |
1390                                                 "[^"]*?"        # single-quoted value
1391                                                 |
1392                                                 [^"\s\]]+       # unquoted value
1393                                         )
1394                                         \s*                     # whitespace or end
1395                                                                 # of directive
1396                                 )
1397                         *)              # 0 or more parameters
1398                         \]\]            # directive closed
1399                 }sx;
1400         }
1401
1402         $content =~ s{$regex}{$handle->($1, $2, $3, $4)}eg;
1403         return $content;
1404 }
1405
1406 sub filter ($$$) {
1407         my $page=shift;
1408         my $destpage=shift;
1409         my $content=shift;
1410
1411         run_hooks(filter => sub {
1412                 $content=shift->(page => $page, destpage => $destpage, 
1413                         content => $content);
1414         });
1415
1416         return $content;
1417 }
1418
1419 sub check_canedit ($$$;$) {
1420         my $page=shift;
1421         my $q=shift;
1422         my $session=shift;
1423         my $nonfatal=shift;
1424         
1425         my $canedit;
1426         run_hooks(canedit => sub {
1427                 return if defined $canedit;
1428                 my $ret=shift->($page, $q, $session);
1429                 if (defined $ret) {
1430                         if ($ret eq "") {
1431                                 $canedit=1;
1432                         }
1433                         elsif (ref $ret eq 'CODE') {
1434                                 $ret->() unless $nonfatal;
1435                                 $canedit=0;
1436                         }
1437                         elsif (defined $ret) {
1438                                 error($ret) unless $nonfatal;
1439                                 $canedit=0;
1440                         }
1441                 }
1442         });
1443         return defined $canedit ? $canedit : 1;
1444 }
1445
1446 sub check_content (@) {
1447         my %params=@_;
1448         
1449         return 1 if ! exists $hooks{checkcontent}; # optimisation
1450
1451         if (exists $pagesources{$params{page}}) {
1452                 my @diff;
1453                 my %old=map { $_ => 1 }
1454                         split("\n", readfile(srcfile($pagesources{$params{page}})));
1455                 foreach my $line (split("\n", $params{content})) {
1456                         push @diff, $line if ! exists $old{$line};
1457                 }
1458                 $params{diff}=join("\n", @diff);
1459         }
1460
1461         my $ok;
1462         run_hooks(checkcontent => sub {
1463                 return if defined $ok;
1464                 my $ret=shift->(%params);
1465                 if (defined $ret) {
1466                         if ($ret eq "") {
1467                                 $ok=1;
1468                         }
1469                         elsif (ref $ret eq 'CODE') {
1470                                 $ret->() unless $params{nonfatal};
1471                                 $ok=0;
1472                         }
1473                         elsif (defined $ret) {
1474                                 error($ret) unless $params{nonfatal};
1475                                 $ok=0;
1476                         }
1477                 }
1478
1479         });
1480         return defined $ok ? $ok : 1;
1481 }
1482
1483 my $wikilock;
1484
1485 sub lockwiki () {
1486         # Take an exclusive lock on the wiki to prevent multiple concurrent
1487         # run issues. The lock will be dropped on program exit.
1488         if (! -d $config{wikistatedir}) {
1489                 mkdir($config{wikistatedir});
1490         }
1491         open($wikilock, '>', "$config{wikistatedir}/lockfile") ||
1492                 error ("cannot write to $config{wikistatedir}/lockfile: $!");
1493         if (! flock($wikilock, 2)) { # LOCK_EX
1494                 error("failed to get lock");
1495         }
1496         return 1;
1497 }
1498
1499 sub unlockwiki () {
1500         POSIX::close($ENV{IKIWIKI_CGILOCK_FD}) if exists $ENV{IKIWIKI_CGILOCK_FD};
1501         return close($wikilock) if $wikilock;
1502         return;
1503 }
1504
1505 my $commitlock;
1506
1507 sub commit_hook_enabled () {
1508         open($commitlock, '+>', "$config{wikistatedir}/commitlock") ||
1509                 error("cannot write to $config{wikistatedir}/commitlock: $!");
1510         if (! flock($commitlock, 1 | 4)) { # LOCK_SH | LOCK_NB to test
1511                 close($commitlock) || error("failed closing commitlock: $!");
1512                 return 0;
1513         }
1514         close($commitlock) || error("failed closing commitlock: $!");
1515         return 1;
1516 }
1517
1518 sub disable_commit_hook () {
1519         open($commitlock, '>', "$config{wikistatedir}/commitlock") ||
1520                 error("cannot write to $config{wikistatedir}/commitlock: $!");
1521         if (! flock($commitlock, 2)) { # LOCK_EX
1522                 error("failed to get commit lock");
1523         }
1524         return 1;
1525 }
1526
1527 sub enable_commit_hook () {
1528         return close($commitlock) if $commitlock;
1529         return;
1530 }
1531
1532 sub loadindex () {
1533         %oldrenderedfiles=%pagectime=();
1534         if (! $config{rebuild}) {
1535                 %pagesources=%pagemtime=%oldlinks=%links=%depends=
1536                 %destsources=%renderedfiles=%pagecase=%pagestate=
1537                 %depends_simple=%typedlinks=%oldtypedlinks=();
1538         }
1539         my $in;
1540         if (! open ($in, "<", "$config{wikistatedir}/indexdb")) {
1541                 if (-e "$config{wikistatedir}/index") {
1542                         system("ikiwiki-transition", "indexdb", $config{srcdir});
1543                         open ($in, "<", "$config{wikistatedir}/indexdb") || return;
1544                 }
1545                 else {
1546                         $config{gettime}=1; # first build
1547                         return;
1548                 }
1549         }
1550
1551         my $index=Storable::fd_retrieve($in);
1552         if (! defined $index) {
1553                 return 0;
1554         }
1555
1556         my $pages;
1557         if (exists $index->{version} && ! ref $index->{version}) {
1558                 $pages=$index->{page};
1559                 %wikistate=%{$index->{state}};
1560         }
1561         else {
1562                 $pages=$index;
1563                 %wikistate=();
1564         }
1565
1566         foreach my $src (keys %$pages) {
1567                 my $d=$pages->{$src};
1568                 my $page=pagename($src);
1569                 $pagectime{$page}=$d->{ctime};
1570                 $pagesources{$page}=$src;
1571                 if (! $config{rebuild}) {
1572                         $pagemtime{$page}=$d->{mtime};
1573                         $renderedfiles{$page}=$d->{dest};
1574                         if (exists $d->{links} && ref $d->{links}) {
1575                                 $links{$page}=$d->{links};
1576                                 $oldlinks{$page}=[@{$d->{links}}];
1577                         }
1578                         if (ref $d->{depends_simple} eq 'ARRAY') {
1579                                 # old format
1580                                 $depends_simple{$page}={
1581                                         map { $_ => 1 } @{$d->{depends_simple}}
1582                                 };
1583                         }
1584                         elsif (exists $d->{depends_simple}) {
1585                                 $depends_simple{$page}=$d->{depends_simple};
1586                         }
1587                         if (exists $d->{dependslist}) {
1588                                 # old format
1589                                 $depends{$page}={
1590                                         map { $_ => $DEPEND_CONTENT }
1591                                                 @{$d->{dependslist}}
1592                                 };
1593                         }
1594                         elsif (exists $d->{depends} && ! ref $d->{depends}) {
1595                                 # old format
1596                                 $depends{$page}={$d->{depends} => $DEPEND_CONTENT };
1597                         }
1598                         elsif (exists $d->{depends}) {
1599                                 $depends{$page}=$d->{depends};
1600                         }
1601                         if (exists $d->{state}) {
1602                                 $pagestate{$page}=$d->{state};
1603                         }
1604                         if (exists $d->{typedlinks}) {
1605                                 $typedlinks{$page}=$d->{typedlinks};
1606
1607                                 while (my ($type, $links) = each %{$typedlinks{$page}}) {
1608                                         next unless %$links;
1609                                         $oldtypedlinks{$page}{$type} = {%$links};
1610                                 }
1611                         }
1612                 }
1613                 $oldrenderedfiles{$page}=[@{$d->{dest}}];
1614         }
1615         foreach my $page (keys %pagesources) {
1616                 $pagecase{lc $page}=$page;
1617         }
1618         foreach my $page (keys %renderedfiles) {
1619                 $destsources{$_}=$page foreach @{$renderedfiles{$page}};
1620         }
1621         return close($in);
1622 }
1623
1624 sub saveindex () {
1625         run_hooks(savestate => sub { shift->() });
1626
1627         my %hookids;
1628         foreach my $type (keys %hooks) {
1629                 $hookids{$_}=1 foreach keys %{$hooks{$type}};
1630         }
1631         my @hookids=keys %hookids;
1632
1633         if (! -d $config{wikistatedir}) {
1634                 mkdir($config{wikistatedir});
1635         }
1636         my $newfile="$config{wikistatedir}/indexdb.new";
1637         my $cleanup = sub { unlink($newfile) };
1638         open (my $out, '>', $newfile) || error("cannot write to $newfile: $!", $cleanup);
1639
1640         my %index;
1641         foreach my $page (keys %pagemtime) {
1642                 next unless $pagemtime{$page};
1643                 my $src=$pagesources{$page};
1644
1645                 $index{page}{$src}={
1646                         ctime => $pagectime{$page},
1647                         mtime => $pagemtime{$page},
1648                         dest => $renderedfiles{$page},
1649                         links => $links{$page},
1650                 };
1651
1652                 if (exists $depends{$page}) {
1653                         $index{page}{$src}{depends} = $depends{$page};
1654                 }
1655
1656                 if (exists $depends_simple{$page}) {
1657                         $index{page}{$src}{depends_simple} = $depends_simple{$page};
1658                 }
1659
1660                 if (exists $typedlinks{$page} && %{$typedlinks{$page}}) {
1661                         $index{page}{$src}{typedlinks} = $typedlinks{$page};
1662                 }
1663
1664                 if (exists $pagestate{$page}) {
1665                         foreach my $id (@hookids) {
1666                                 foreach my $key (keys %{$pagestate{$page}{$id}}) {
1667                                         $index{page}{$src}{state}{$id}{$key}=$pagestate{$page}{$id}{$key};
1668                                 }
1669                         }
1670                 }
1671         }
1672
1673         $index{state}={};
1674         foreach my $id (@hookids) {
1675                 foreach my $key (keys %{$wikistate{$id}}) {
1676                         $index{state}{$id}{$key}=$wikistate{$id}{$key};
1677                 }
1678         }
1679         
1680         $index{version}="3";
1681         my $ret=Storable::nstore_fd(\%index, $out);
1682         return if ! defined $ret || ! $ret;
1683         close $out || error("failed saving to $newfile: $!", $cleanup);
1684         rename($newfile, "$config{wikistatedir}/indexdb") ||
1685                 error("failed renaming $newfile to $config{wikistatedir}/indexdb", $cleanup);
1686         
1687         return 1;
1688 }
1689
1690 sub template_file ($) {
1691         my $name=shift;
1692         
1693         my $tpage=($name =~ s/^\///) ? $name : "templates/$name";
1694         if ($name !~ /\.tmpl$/ && exists $pagesources{$tpage}) {
1695                 $tpage=$pagesources{$tpage};
1696                 $name.=".tmpl";
1697         }
1698
1699         my $template=srcfile($tpage, 1);
1700         if (defined $template) {
1701                 return $template, $tpage, 1 if wantarray;
1702                 return $template;
1703         }
1704         else {
1705                 $name=~s:/::; # avoid path traversal
1706                 foreach my $dir ($config{templatedir},
1707                                  "$installdir/share/ikiwiki/templates") {
1708                         if (-e "$dir/$name") {
1709                                 $template="$dir/$name";
1710                                 last;
1711                         }
1712                 }
1713                 if (defined $template) {        
1714                         return $template, $tpage if wantarray;
1715                         return $template;
1716                 }
1717         }
1718
1719         return;
1720 }
1721
1722 sub template_depends ($$;@) {
1723         my $name=shift;
1724         my $page=shift;
1725         
1726         my ($filename, $tpage, $untrusted)=template_file($name);
1727         if (defined $page && defined $tpage) {
1728                 add_depends($page, $tpage);
1729         }
1730
1731         return unless defined $filename;
1732
1733         my @opts=(
1734                 filter => sub {
1735                         my $text_ref = shift;
1736                         ${$text_ref} = decode_utf8(${$text_ref});
1737                 },
1738                 loop_context_vars => 1,
1739                 die_on_bad_params => 0,
1740                 filename => $filename,
1741                 @_,
1742                 ($untrusted ? (no_includes => 1) : ()),
1743         );
1744         return @opts if wantarray;
1745
1746         require HTML::Template;
1747         return HTML::Template->new(@opts);
1748 }
1749
1750 sub template ($;@) {
1751         template_depends(shift, undef, @_);
1752 }
1753
1754 sub misctemplate ($$;@) {
1755         my $title=shift;
1756         my $content=shift;
1757         my %params=@_;
1758         
1759         my $template=template("page.tmpl");
1760
1761         my $page="";
1762         if (exists $params{page}) {
1763                 $page=delete $params{page};
1764         }
1765         run_hooks(pagetemplate => sub {
1766                 shift->(
1767                         page => $page,
1768                         destpage => $page,
1769                         template => $template,
1770                 );
1771         });
1772         templateactions($template, "");
1773
1774         $template->param(
1775                 dynamic => 1,
1776                 title => $title,
1777                 wikiname => $config{wikiname},
1778                 content => $content,
1779                 baseurl => baseurl(),
1780                 html5 => $config{html5},
1781                 %params,
1782         );
1783         
1784         return $template->output;
1785 }
1786
1787 sub templateactions ($$) {
1788         my $template=shift;
1789         my $page=shift;
1790
1791         my $have_actions=0;
1792         my @actions;
1793         run_hooks(pageactions => sub {
1794                 push @actions, map { { action => $_ } } 
1795                         grep { defined } shift->(page => $page);
1796         });
1797         $template->param(actions => \@actions);
1798
1799         if ($config{cgiurl} && exists $hooks{auth}) {
1800                 $template->param(prefsurl => cgiurl(do => "prefs"));
1801                 $have_actions=1;
1802         }
1803
1804         if ($have_actions || @actions) {
1805                 $template->param(have_actions => 1);
1806         }
1807 }
1808
1809 sub hook (@) {
1810         my %param=@_;
1811         
1812         if (! exists $param{type} || ! ref $param{call} || ! exists $param{id}) {
1813                 error 'hook requires type, call, and id parameters';
1814         }
1815
1816         return if $param{no_override} && exists $hooks{$param{type}}{$param{id}};
1817         
1818         $hooks{$param{type}}{$param{id}}=\%param;
1819         return 1;
1820 }
1821
1822 sub run_hooks ($$) {
1823         # Calls the given sub for each hook of the given type,
1824         # passing it the hook function to call.
1825         my $type=shift;
1826         my $sub=shift;
1827
1828         if (exists $hooks{$type}) {
1829                 my (@first, @middle, @last);
1830                 foreach my $id (keys %{$hooks{$type}}) {
1831                         if ($hooks{$type}{$id}{first}) {
1832                                 push @first, $id;
1833                         }
1834                         elsif ($hooks{$type}{$id}{last}) {
1835                                 push @last, $id;
1836                         }
1837                         else {
1838                                 push @middle, $id;
1839                         }
1840                 }
1841                 foreach my $id (@first, @middle, @last) {
1842                         $sub->($hooks{$type}{$id}{call});
1843                 }
1844         }
1845
1846         return 1;
1847 }
1848
1849 sub rcs_update () {
1850         $hooks{rcs}{rcs_update}{call}->(@_);
1851 }
1852
1853 sub rcs_prepedit ($) {
1854         $hooks{rcs}{rcs_prepedit}{call}->(@_);
1855 }
1856
1857 sub rcs_commit (@) {
1858         $hooks{rcs}{rcs_commit}{call}->(@_);
1859 }
1860
1861 sub rcs_commit_staged (@) {
1862         $hooks{rcs}{rcs_commit_staged}{call}->(@_);
1863 }
1864
1865 sub rcs_add ($) {
1866         $hooks{rcs}{rcs_add}{call}->(@_);
1867 }
1868
1869 sub rcs_remove ($) {
1870         $hooks{rcs}{rcs_remove}{call}->(@_);
1871 }
1872
1873 sub rcs_rename ($$) {
1874         $hooks{rcs}{rcs_rename}{call}->(@_);
1875 }
1876
1877 sub rcs_recentchanges ($) {
1878         $hooks{rcs}{rcs_recentchanges}{call}->(@_);
1879 }
1880
1881 sub rcs_diff ($) {
1882         $hooks{rcs}{rcs_diff}{call}->(@_);
1883 }
1884
1885 sub rcs_getctime ($) {
1886         $hooks{rcs}{rcs_getctime}{call}->(@_);
1887 }
1888
1889 sub rcs_getmtime ($) {
1890         $hooks{rcs}{rcs_getmtime}{call}->(@_);
1891 }
1892
1893 sub rcs_receive () {
1894         $hooks{rcs}{rcs_receive}{call}->();
1895 }
1896
1897 sub add_depends ($$;$) {
1898         my $page=shift;
1899         my $pagespec=shift;
1900         my $deptype=shift || $DEPEND_CONTENT;
1901
1902         # Is the pagespec a simple page name?
1903         if ($pagespec =~ /$config{wiki_file_regexp}/ &&
1904             $pagespec !~ /[\s*?()!]/) {
1905                 $depends_simple{$page}{lc $pagespec} |= $deptype;
1906                 return 1;
1907         }
1908
1909         # Add explicit dependencies for influences.
1910         my $sub=pagespec_translate($pagespec);
1911         return unless defined $sub;
1912         foreach my $p (keys %pagesources) {
1913                 my $r=$sub->($p, location => $page);
1914                 my $i=$r->influences;
1915                 my $static=$r->influences_static;
1916                 foreach my $k (keys %$i) {
1917                         next unless $r || $static || $k eq $page;
1918                         $depends_simple{$page}{lc $k} |= $i->{$k};
1919                 }
1920                 last if $static;
1921         }
1922
1923         $depends{$page}{$pagespec} |= $deptype;
1924         return 1;
1925 }
1926
1927 sub deptype (@) {
1928         my $deptype=0;
1929         foreach my $type (@_) {
1930                 if ($type eq 'presence') {
1931                         $deptype |= $DEPEND_PRESENCE;
1932                 }
1933                 elsif ($type eq 'links') { 
1934                         $deptype |= $DEPEND_LINKS;
1935                 }
1936                 elsif ($type eq 'content') {
1937                         $deptype |= $DEPEND_CONTENT;
1938                 }
1939         }
1940         return $deptype;
1941 }
1942
1943 my $file_prune_regexp;
1944 sub file_pruned ($) {
1945         my $file=shift;
1946
1947         if (defined $config{include} && length $config{include}) {
1948                 return 0 if $file =~ m/$config{include}/;
1949         }
1950
1951         if (! defined $file_prune_regexp) {
1952                 $file_prune_regexp='('.join('|', @{$config{wiki_file_prune_regexps}}).')';
1953                 $file_prune_regexp=qr/$file_prune_regexp/;
1954         }
1955         return $file =~ m/$file_prune_regexp/;
1956 }
1957
1958 sub define_gettext () {
1959         # If translation is needed, redefine the gettext function to do it.
1960         # Otherwise, it becomes a quick no-op.
1961         my $gettext_obj;
1962         my $getobj;
1963         if ((exists $ENV{LANG} && length $ENV{LANG}) ||
1964             (exists $ENV{LC_ALL} && length $ENV{LC_ALL}) ||
1965             (exists $ENV{LC_MESSAGES} && length $ENV{LC_MESSAGES})) {
1966                 $getobj=sub {
1967                         $gettext_obj=eval q{
1968                                 use Locale::gettext q{textdomain};
1969                                 Locale::gettext->domain('ikiwiki')
1970                         };
1971                 };
1972         }
1973
1974         no warnings 'redefine';
1975         *gettext=sub {
1976                 $getobj->() if $getobj;
1977                 if ($gettext_obj) {
1978                         $gettext_obj->get(shift);
1979                 }
1980                 else {
1981                         return shift;
1982                 }
1983         };
1984         *ngettext=sub {
1985                 $getobj->() if $getobj;
1986                 if ($gettext_obj) {
1987                         $gettext_obj->nget(@_);
1988                 }
1989                 else {
1990                         return ($_[2] == 1 ? $_[0] : $_[1])
1991                 }
1992         };
1993 }
1994
1995 sub gettext {
1996         define_gettext();
1997         gettext(@_);
1998 }
1999
2000 sub ngettext {
2001         define_gettext();
2002         ngettext(@_);
2003 }
2004
2005 sub yesno ($) {
2006         my $val=shift;
2007
2008         return (defined $val && (lc($val) eq gettext("yes") || lc($val) eq "yes" || $val eq "1"));
2009 }
2010
2011 sub inject {
2012         # Injects a new function into the symbol table to replace an
2013         # exported function.
2014         my %params=@_;
2015
2016         # This is deep ugly perl foo, beware.
2017         no strict;
2018         no warnings;
2019         if (! defined $params{parent}) {
2020                 $params{parent}='::';
2021                 $params{old}=\&{$params{name}};
2022                 $params{name}=~s/.*:://;
2023         }
2024         my $parent=$params{parent};
2025         foreach my $ns (grep /^\w+::/, keys %{$parent}) {
2026                 $ns = $params{parent} . $ns;
2027                 inject(%params, parent => $ns) unless $ns eq '::main::';
2028                 *{$ns . $params{name}} = $params{call}
2029                         if exists ${$ns}{$params{name}} &&
2030                            \&{${$ns}{$params{name}}} == $params{old};
2031         }
2032         use strict;
2033         use warnings;
2034 }
2035
2036 sub add_link ($$;$) {
2037         my $page=shift;
2038         my $link=shift;
2039         my $type=shift;
2040
2041         push @{$links{$page}}, $link
2042                 unless grep { $_ eq $link } @{$links{$page}};
2043
2044         if (defined $type) {
2045                 $typedlinks{$page}{$type}{$link} = 1;
2046         }
2047 }
2048
2049 sub add_autofile ($$$) {
2050         my $file=shift;
2051         my $plugin=shift;
2052         my $generator=shift;
2053         
2054         $autofiles{$file}{plugin}=$plugin;
2055         $autofiles{$file}{generator}=$generator;
2056 }
2057
2058 sub sortspec_translate ($$) {
2059         my $spec = shift;
2060         my $reverse = shift;
2061
2062         my $code = "";
2063         my @data;
2064         while ($spec =~ m{
2065                 \s*
2066                 (-?)            # group 1: perhaps negated
2067                 \s*
2068                 (               # group 2: a word
2069                         \w+\([^\)]*\)   # command(params)
2070                         |
2071                         [^\s]+          # or anything else
2072                 )
2073                 \s*
2074         }gx) {
2075                 my $negated = $1;
2076                 my $word = $2;
2077                 my $params = undef;
2078
2079                 if ($word =~ m/^(\w+)\((.*)\)$/) {
2080                         # command with parameters
2081                         $params = $2;
2082                         $word = $1;
2083                 }
2084                 elsif ($word !~ m/^\w+$/) {
2085                         error(sprintf(gettext("invalid sort type %s"), $word));
2086                 }
2087
2088                 if (length $code) {
2089                         $code .= " || ";
2090                 }
2091
2092                 if ($negated) {
2093                         $code .= "-";
2094                 }
2095
2096                 if (exists $IkiWiki::SortSpec::{"cmp_$word"}) {
2097                         if (defined $params) {
2098                                 push @data, $params;
2099                                 $code .= "IkiWiki::SortSpec::cmp_$word(\$data[$#data])";
2100                         }
2101                         else {
2102                                 $code .= "IkiWiki::SortSpec::cmp_$word(undef)";
2103                         }
2104                 }
2105                 else {
2106                         error(sprintf(gettext("unknown sort type %s"), $word));
2107                 }
2108         }
2109
2110         if (! length $code) {
2111                 # undefined sorting method... sort arbitrarily
2112                 return sub { 0 };
2113         }
2114
2115         if ($reverse) {
2116                 $code="-($code)";
2117         }
2118
2119         no warnings;
2120         return eval 'sub { '.$code.' }';
2121 }
2122
2123 sub pagespec_translate ($) {
2124         my $spec=shift;
2125
2126         # Convert spec to perl code.
2127         my $code="";
2128         my @data;
2129         while ($spec=~m{
2130                 \s*             # ignore whitespace
2131                 (               # 1: match a single word
2132                         \!              # !
2133                 |
2134                         \(              # (
2135                 |
2136                         \)              # )
2137                 |
2138                         \w+\([^\)]*\)   # command(params)
2139                 |
2140                         [^\s()]+        # any other text
2141                 )
2142                 \s*             # ignore whitespace
2143         }gx) {
2144                 my $word=$1;
2145                 if (lc $word eq 'and') {
2146                         $code.=' &';
2147                 }
2148                 elsif (lc $word eq 'or') {
2149                         $code.=' |';
2150                 }
2151                 elsif ($word eq "(" || $word eq ")" || $word eq "!") {
2152                         $code.=' '.$word;
2153                 }
2154                 elsif ($word =~ /^(\w+)\((.*)\)$/) {
2155                         if (exists $IkiWiki::PageSpec::{"match_$1"}) {
2156                                 push @data, $2;
2157                                 $code.="IkiWiki::PageSpec::match_$1(\$page, \$data[$#data], \@_)";
2158                         }
2159                         else {
2160                                 push @data, qq{unknown function in pagespec "$word"};
2161                                 $code.="IkiWiki::ErrorReason->new(\$data[$#data])";
2162                         }
2163                 }
2164                 else {
2165                         push @data, $word;
2166                         $code.=" IkiWiki::PageSpec::match_glob(\$page, \$data[$#data], \@_)";
2167                 }
2168         }
2169
2170         if (! length $code) {
2171                 $code="IkiWiki::FailReason->new('empty pagespec')";
2172         }
2173
2174         no warnings;
2175         return eval 'sub { my $page=shift; '.$code.' }';
2176 }
2177
2178 sub pagespec_match ($$;@) {
2179         my $page=shift;
2180         my $spec=shift;
2181         my @params=@_;
2182
2183         # Backwards compatability with old calling convention.
2184         if (@params == 1) {
2185                 unshift @params, 'location';
2186         }
2187
2188         my $sub=pagespec_translate($spec);
2189         return IkiWiki::ErrorReason->new("syntax error in pagespec \"$spec\"")
2190                 if ! defined $sub;
2191         return $sub->($page, @params);
2192 }
2193
2194 sub pagespec_match_list ($$;@) {
2195         my $page=shift;
2196         my $pagespec=shift;
2197         my %params=@_;
2198
2199         # Backwards compatability with old calling convention.
2200         if (ref $page) {
2201                 print STDERR "warning: a plugin (".caller().") is using pagespec_match_list in an obsolete way, and needs to be updated\n";
2202                 $params{list}=$page;
2203                 $page=$params{location}; # ugh!
2204         }
2205
2206         my $sub=pagespec_translate($pagespec);
2207         error "syntax error in pagespec \"$pagespec\""
2208                 if ! defined $sub;
2209         my $sort=sortspec_translate($params{sort}, $params{reverse})
2210                 if defined $params{sort};
2211
2212         my @candidates;
2213         if (exists $params{list}) {
2214                 @candidates=exists $params{filter}
2215                         ? grep { ! $params{filter}->($_) } @{$params{list}}
2216                         : @{$params{list}};
2217         }
2218         else {
2219                 @candidates=exists $params{filter}
2220                         ? grep { ! $params{filter}->($_) } keys %pagesources
2221                         : keys %pagesources;
2222         }
2223         
2224         # clear params, remainder is passed to pagespec
2225         $depends{$page}{$pagespec} |= ($params{deptype} || $DEPEND_CONTENT);
2226         my $num=$params{num};
2227         delete @params{qw{num deptype reverse sort filter list}};
2228         
2229         # when only the top matches will be returned, it's efficient to
2230         # sort before matching to pagespec,
2231         if (defined $num && defined $sort) {
2232                 @candidates=IkiWiki::SortSpec::sort_pages(
2233                         $sort, @candidates);
2234         }
2235         
2236         my @matches;
2237         my $firstfail;
2238         my $count=0;
2239         my $accum=IkiWiki::SuccessReason->new();
2240         foreach my $p (@candidates) {
2241                 my $r=$sub->($p, %params, location => $page);
2242                 error(sprintf(gettext("cannot match pages: %s"), $r))
2243                         if $r->isa("IkiWiki::ErrorReason");
2244                 unless ($r || $r->influences_static) {
2245                         $r->remove_influence($p);
2246                 }
2247                 $accum |= $r;
2248                 if ($r) {
2249                         push @matches, $p;
2250                         last if defined $num && ++$count == $num;
2251                 }
2252         }
2253
2254         # Add simple dependencies for accumulated influences.
2255         my $i=$accum->influences;
2256         foreach my $k (keys %$i) {
2257                 $depends_simple{$page}{lc $k} |= $i->{$k};
2258         }
2259
2260         # when all matches will be returned, it's efficient to
2261         # sort after matching
2262         if (! defined $num && defined $sort) {
2263                 return IkiWiki::SortSpec::sort_pages(
2264                         $sort, @matches);
2265         }
2266         else {
2267                 return @matches;
2268         }
2269 }
2270
2271 sub pagespec_valid ($) {
2272         my $spec=shift;
2273
2274         return defined pagespec_translate($spec);
2275 }
2276
2277 sub glob2re ($) {
2278         my $re=quotemeta(shift);
2279         $re=~s/\\\*/.*/g;
2280         $re=~s/\\\?/./g;
2281         return $re;
2282 }
2283
2284 package IkiWiki::FailReason;
2285
2286 use overload (
2287         '""'    => sub { $_[0][0] },
2288         '0+'    => sub { 0 },
2289         '!'     => sub { bless $_[0], 'IkiWiki::SuccessReason'},
2290         '&'     => sub { $_[0]->merge_influences($_[1], 1); $_[0] },
2291         '|'     => sub { $_[1]->merge_influences($_[0]); $_[1] },
2292         fallback => 1,
2293 );
2294
2295 our @ISA = 'IkiWiki::SuccessReason';
2296
2297 package IkiWiki::SuccessReason;
2298
2299 use overload (
2300         '""'    => sub { $_[0][0] },
2301         '0+'    => sub { 1 },
2302         '!'     => sub { bless $_[0], 'IkiWiki::FailReason'},
2303         '&'     => sub { $_[1]->merge_influences($_[0], 1); $_[1] },
2304         '|'     => sub { $_[0]->merge_influences($_[1]); $_[0] },
2305         fallback => 1,
2306 );
2307
2308 sub new {
2309         my $class = shift;
2310         my $value = shift;
2311         return bless [$value, {@_}], $class;
2312 }
2313
2314 sub influences {
2315         my $this=shift;
2316         $this->[1]={@_} if @_;
2317         my %i=%{$this->[1]};
2318         delete $i{""};
2319         return \%i;
2320 }
2321
2322 sub influences_static {
2323         return ! $_[0][1]->{""};
2324 }
2325
2326 sub merge_influences {
2327         my $this=shift;
2328         my $other=shift;
2329         my $anded=shift;
2330
2331         if (! $anded || (($this || %{$this->[1]}) &&
2332                          ($other || %{$other->[1]}))) {
2333                 foreach my $influence (keys %{$other->[1]}) {
2334                         $this->[1]{$influence} |= $other->[1]{$influence};
2335                 }
2336         }
2337         else {
2338                 # influence blocker
2339                 $this->[1]={};
2340         }
2341 }
2342
2343 sub remove_influence {
2344         my $this=shift;
2345         my $torm=shift;
2346
2347         delete $this->[1]{$torm};
2348 }
2349
2350 package IkiWiki::ErrorReason;
2351
2352 our @ISA = 'IkiWiki::FailReason';
2353
2354 package IkiWiki::PageSpec;
2355
2356 sub derel ($$) {
2357         my $path=shift;
2358         my $from=shift;
2359
2360         if ($path =~ m!^\./!) {
2361                 $from=~s#/?[^/]+$## if defined $from;
2362                 $path=~s#^\./##;
2363                 $path="$from/$path" if defined $from && length $from;
2364         }
2365
2366         return $path;
2367 }
2368
2369 sub match_glob ($$;@) {
2370         my $page=shift;
2371         my $glob=shift;
2372         my %params=@_;
2373         
2374         $glob=derel($glob, $params{location});
2375
2376         my $regexp=IkiWiki::glob2re($glob);
2377         if ($page=~/^$regexp$/i) {
2378                 if (! IkiWiki::isinternal($page) || $params{internal}) {
2379                         return IkiWiki::SuccessReason->new("$glob matches $page");
2380                 }
2381                 else {
2382                         return IkiWiki::FailReason->new("$glob matches $page, but the page is an internal page");
2383                 }
2384         }
2385         else {
2386                 return IkiWiki::FailReason->new("$glob does not match $page");
2387         }
2388 }
2389
2390 sub match_internal ($$;@) {
2391         return match_glob(shift, shift, @_, internal => 1)
2392 }
2393
2394 sub match_page ($$;@) {
2395         my $page=shift;
2396         my $match=match_glob($page, shift, @_);
2397         if ($match && ! (exists $IkiWiki::pagesources{$page}
2398             && defined IkiWiki::pagetype($IkiWiki::pagesources{$page}))) {
2399                 return IkiWiki::FailReason->new("$page is not a page");
2400         }
2401         else {
2402                 return $match;
2403         }
2404 }
2405
2406 sub match_link ($$;@) {
2407         my $page=shift;
2408         my $link=lc(shift);
2409         my %params=@_;
2410
2411         $link=derel($link, $params{location});
2412         my $from=exists $params{location} ? $params{location} : '';
2413         my $linktype=$params{linktype};
2414         my $qualifier='';
2415         if (defined $linktype) {
2416                 $qualifier=" with type $linktype";
2417         }
2418
2419         my $links = $IkiWiki::links{$page};
2420         return IkiWiki::FailReason->new("$page has no links", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2421                 unless $links && @{$links};
2422         my $bestlink = IkiWiki::bestlink($from, $link);
2423         foreach my $p (@{$links}) {
2424                 next unless (! defined $linktype || exists $IkiWiki::typedlinks{$page}{$linktype}{$p});
2425
2426                 if (length $bestlink) {
2427                         if ($bestlink eq IkiWiki::bestlink($page, $p)) {
2428                                 return IkiWiki::SuccessReason->new("$page links to $link$qualifier", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2429                         }
2430                 }
2431                 else {
2432                         if (match_glob($p, $link, %params)) {
2433                                 return IkiWiki::SuccessReason->new("$page links to page $p$qualifier, matching $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2434                         }
2435                         my ($p_rel)=$p=~/^\/?(.*)/;
2436                         $link=~s/^\///;
2437                         if (match_glob($p_rel, $link, %params)) {
2438                                 return IkiWiki::SuccessReason->new("$page links to page $p_rel$qualifier, matching $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2439                         }
2440                 }
2441         }
2442         return IkiWiki::FailReason->new("$page does not link to $link$qualifier", $page => $IkiWiki::DEPEND_LINKS, "" => 1);
2443 }
2444
2445 sub match_backlink ($$;@) {
2446         my $ret=match_link($_[1], $_[0], @_);
2447         $ret->influences($_[1] => $IkiWiki::DEPEND_LINKS);
2448         return $ret;
2449 }
2450
2451 sub match_created_before ($$;@) {
2452         my $page=shift;
2453         my $testpage=shift;
2454         my %params=@_;
2455         
2456         $testpage=derel($testpage, $params{location});
2457
2458         if (exists $IkiWiki::pagectime{$testpage}) {
2459                 if ($IkiWiki::pagectime{$page} < $IkiWiki::pagectime{$testpage}) {
2460                         return IkiWiki::SuccessReason->new("$page created before $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2461                 }
2462                 else {
2463                         return IkiWiki::FailReason->new("$page not created before $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2464                 }
2465         }
2466         else {
2467                 return IkiWiki::ErrorReason->new("$testpage does not exist", $testpage => $IkiWiki::DEPEND_PRESENCE);
2468         }
2469 }
2470
2471 sub match_created_after ($$;@) {
2472         my $page=shift;
2473         my $testpage=shift;
2474         my %params=@_;
2475         
2476         $testpage=derel($testpage, $params{location});
2477
2478         if (exists $IkiWiki::pagectime{$testpage}) {
2479                 if ($IkiWiki::pagectime{$page} > $IkiWiki::pagectime{$testpage}) {
2480                         return IkiWiki::SuccessReason->new("$page created after $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2481                 }
2482                 else {
2483                         return IkiWiki::FailReason->new("$page not created after $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2484                 }
2485         }
2486         else {
2487                 return IkiWiki::ErrorReason->new("$testpage does not exist", $testpage => $IkiWiki::DEPEND_PRESENCE);
2488         }
2489 }
2490
2491 sub match_creation_day ($$;@) {
2492         if ((localtime($IkiWiki::pagectime{shift()}))[3] == shift) {
2493                 return IkiWiki::SuccessReason->new('creation_day matched');
2494         }
2495         else {
2496                 return IkiWiki::FailReason->new('creation_day did not match');
2497         }
2498 }
2499
2500 sub match_creation_month ($$;@) {
2501         if ((localtime($IkiWiki::pagectime{shift()}))[4] + 1 == shift) {
2502                 return IkiWiki::SuccessReason->new('creation_month matched');
2503         }
2504         else {
2505                 return IkiWiki::FailReason->new('creation_month did not match');
2506         }
2507 }
2508
2509 sub match_creation_year ($$;@) {
2510         if ((localtime($IkiWiki::pagectime{shift()}))[5] + 1900 == shift) {
2511                 return IkiWiki::SuccessReason->new('creation_year matched');
2512         }
2513         else {
2514                 return IkiWiki::FailReason->new('creation_year did not match');
2515         }
2516 }
2517
2518 sub match_user ($$;@) {
2519         shift;
2520         my $user=shift;
2521         my %params=@_;
2522         
2523         my $regexp=IkiWiki::glob2re($user);
2524         
2525         if (! exists $params{user}) {
2526                 return IkiWiki::ErrorReason->new("no user specified");
2527         }
2528
2529         if (defined $params{user} && $params{user}=~/^$regexp$/i) {
2530                 return IkiWiki::SuccessReason->new("user is $user");
2531         }
2532         elsif (! defined $params{user}) {
2533                 return IkiWiki::FailReason->new("not logged in");
2534         }
2535         else {
2536                 return IkiWiki::FailReason->new("user is $params{user}, not $user");
2537         }
2538 }
2539
2540 sub match_admin ($$;@) {
2541         shift;
2542         shift;
2543         my %params=@_;
2544         
2545         if (! exists $params{user}) {
2546                 return IkiWiki::ErrorReason->new("no user specified");
2547         }
2548
2549         if (defined $params{user} && IkiWiki::is_admin($params{user})) {
2550                 return IkiWiki::SuccessReason->new("user is an admin");
2551         }
2552         elsif (! defined $params{user}) {
2553                 return IkiWiki::FailReason->new("not logged in");
2554         }
2555         else {
2556                 return IkiWiki::FailReason->new("user is not an admin");
2557         }
2558 }
2559
2560 sub match_ip ($$;@) {
2561         shift;
2562         my $ip=shift;
2563         my %params=@_;
2564         
2565         if (! exists $params{ip}) {
2566                 return IkiWiki::ErrorReason->new("no IP specified");
2567         }
2568
2569         if (defined $params{ip} && lc $params{ip} eq lc $ip) {
2570                 return IkiWiki::SuccessReason->new("IP is $ip");
2571         }
2572         else {
2573                 return IkiWiki::FailReason->new("IP is $params{ip}, not $ip");
2574         }
2575 }
2576
2577 package IkiWiki::SortSpec;
2578
2579 # This is in the SortSpec namespace so that the $a and $b that sort() uses
2580 # are easily available in this namespace, for cmp functions to use them.
2581 sub sort_pages {
2582         my $f=shift;
2583         sort $f @_
2584 }
2585
2586 sub cmp_title {
2587         IkiWiki::pagetitle(IkiWiki::basename($a))
2588         cmp
2589         IkiWiki::pagetitle(IkiWiki::basename($b))
2590 }
2591
2592 sub cmp_mtime { $IkiWiki::pagemtime{$b} <=> $IkiWiki::pagemtime{$a} }
2593 sub cmp_age { $IkiWiki::pagectime{$b} <=> $IkiWiki::pagectime{$a} }
2594
2595 1