removed
[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?",
241                 advanced => 0,
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         timezone => {
340                 type => "string", 
341                 default => "",
342                 example => "US/Eastern",
343                 description => "time zone name",
344                 safe => 1,
345                 rebuild => 1,
346         },
347         include => {
348                 type => "string",
349                 default => undef,
350                 example => '^\.htaccess$',
351                 description => "regexp of normally excluded files to include",
352                 advanced => 1,
353                 safe => 0, # regexp
354                 rebuild => 1,
355         },
356         exclude => {
357                 type => "string",
358                 default => undef,
359                 example => '^(*\.private|Makefile)$',
360                 description => "regexp of files that should be skipped",
361                 advanced => 1,
362                 safe => 0, # regexp
363                 rebuild => 1,
364         },
365         wiki_file_prune_regexps => {
366                 type => "internal",
367                 default => [qr/(^|\/)\.\.(\/|$)/, qr/^\//, qr/^\./, qr/\/\./,
368                         qr/\.x?html?$/, qr/\.ikiwiki-new$/,
369                         qr/(^|\/).svn\//, qr/.arch-ids\//, qr/{arch}\//,
370                         qr/(^|\/)_MTN\//, qr/(^|\/)_darcs\//,
371                         qr/(^|\/)CVS\//, qr/\.dpkg-tmp$/],
372                 description => "regexps of source files to ignore",
373                 safe => 0,
374                 rebuild => 1,
375         },
376         wiki_file_chars => {
377                 type => "string",
378                 description => "specifies the characters that are allowed in source filenames",
379                 default => "-[:alnum:]+/.:_",
380                 safe => 0,
381                 rebuild => 1,
382         },
383         wiki_file_regexp => {
384                 type => "internal",
385                 description => "regexp of legal source files",
386                 safe => 0,
387                 rebuild => 1,
388         },
389         web_commit_regexp => {
390                 type => "internal",
391                 default => qr/^web commit (by (.*?(?=: |$))|from ([0-9a-fA-F:.]+[0-9a-fA-F])):?(.*)/,
392                 description => "regexp to parse web commits from logs",
393                 safe => 0,
394                 rebuild => 0,
395         },
396         cgi => {
397                 type => "internal",
398                 default => 0,
399                 description => "run as a cgi",
400                 safe => 0,
401                 rebuild => 0,
402         },
403         cgi_disable_uploads => {
404                 type => "internal",
405                 default => 1,
406                 description => "whether CGI should accept file uploads",
407                 safe => 0,
408                 rebuild => 0,
409         },
410         post_commit => {
411                 type => "internal",
412                 default => 0,
413                 description => "run as a post-commit hook",
414                 safe => 0,
415                 rebuild => 0,
416         },
417         rebuild => {
418                 type => "internal",
419                 default => 0,
420                 description => "running in rebuild mode",
421                 safe => 0,
422                 rebuild => 0,
423         },
424         setup => {
425                 type => "internal",
426                 default => undef,
427                 description => "running in setup mode",
428                 safe => 0,
429                 rebuild => 0,
430         },
431         clean => {
432                 type => "internal",
433                 default => 0,
434                 description => "running in clean mode",
435                 safe => 0,
436                 rebuild => 0,
437         },
438         refresh => {
439                 type => "internal",
440                 default => 0,
441                 description => "running in refresh mode",
442                 safe => 0,
443                 rebuild => 0,
444         },
445         test_receive => {
446                 type => "internal",
447                 default => 0,
448                 description => "running in receive test mode",
449                 safe => 0,
450                 rebuild => 0,
451         },
452         wrapper_background_command => {
453                 type => "internal",
454                 default => '',
455                 description => "background shell command to run",
456                 safe => 0,
457                 rebuild => 0,
458         },
459         gettime => {
460                 type => "internal",
461                 description => "running in gettime mode",
462                 safe => 0,
463                 rebuild => 0,
464         },
465         w3mmode => {
466                 type => "internal",
467                 default => 0,
468                 description => "running in w3mmode",
469                 safe => 0,
470                 rebuild => 0,
471         },
472         wikistatedir => {
473                 type => "internal",
474                 default => undef,
475                 description => "path to the .ikiwiki directory holding ikiwiki state",
476                 safe => 0,
477                 rebuild => 0,
478         },
479         setupfile => {
480                 type => "internal",
481                 default => undef,
482                 description => "path to setup file",
483                 safe => 0,
484                 rebuild => 0,
485         },
486         setuptype => {
487                 type => "internal",
488                 default => "Yaml",
489                 description => "perl class to use to dump setup file",
490                 safe => 0,
491                 rebuild => 0,
492         },
493         allow_symlinks_before_srcdir => {
494                 type => "boolean",
495                 default => 0,
496                 description => "allow symlinks in the path leading to the srcdir (potentially insecure)",
497                 safe => 0,
498                 rebuild => 0,
499         },
500 }
501
502 sub defaultconfig () {
503         my %s=getsetup();
504         my @ret;
505         foreach my $key (keys %s) {
506                 push @ret, $key, $s{$key}->{default};
507         }
508         return @ret;
509 }
510
511 # URL to top of wiki as a path starting with /, valid from any wiki page or
512 # the CGI; if that's not possible, an absolute URL. Either way, it ends with /
513 my $local_url;
514 # URL to CGI script, similar to $local_url
515 my $local_cgiurl;
516
517 sub checkconfig () {
518         # locale stuff; avoid LC_ALL since it overrides everything
519         if (defined $ENV{LC_ALL}) {
520                 $ENV{LANG} = $ENV{LC_ALL};
521                 delete $ENV{LC_ALL};
522         }
523         if (defined $config{locale}) {
524                 if (POSIX::setlocale(&POSIX::LC_ALL, $config{locale})) {
525                         $ENV{LANG}=$config{locale};
526                         define_gettext();
527                 }
528         }
529                 
530         if (! defined $config{wiki_file_regexp}) {
531                 $config{wiki_file_regexp}=qr/(^[$config{wiki_file_chars}]+$)/;
532         }
533
534         if (ref $config{ENV} eq 'HASH') {
535                 foreach my $val (keys %{$config{ENV}}) {
536                         $ENV{$val}=$config{ENV}{$val};
537                 }
538         }
539         if (defined $config{timezone} && length $config{timezone}) {
540                 $ENV{TZ}=$config{timezone};
541         }
542         else {
543                 $config{timezone}=$ENV{TZ};
544         }
545
546         if ($config{w3mmode}) {
547                 eval q{use Cwd q{abs_path}};
548                 error($@) if $@;
549                 $config{srcdir}=possibly_foolish_untaint(abs_path($config{srcdir}));
550                 $config{destdir}=possibly_foolish_untaint(abs_path($config{destdir}));
551                 $config{cgiurl}="file:///\$LIB/ikiwiki-w3m.cgi/".$config{cgiurl}
552                         unless $config{cgiurl} =~ m!file:///!;
553                 $config{url}="file://".$config{destdir};
554         }
555
556         if ($config{cgi} && ! length $config{url}) {
557                 error(gettext("Must specify url to wiki with --url when using --cgi"));
558         }
559
560         if (defined $config{url} && length $config{url}) {
561                 eval q{use URI};
562                 my $baseurl = URI->new($config{url});
563
564                 $local_url = $baseurl->path . "/";
565                 $local_cgiurl = undef;
566
567                 if (length $config{cgiurl}) {
568                         my $cgiurl = URI->new($config{cgiurl});
569
570                         $local_cgiurl = $cgiurl->path;
571
572                         if ($cgiurl->scheme ne $baseurl->scheme or
573                                 $cgiurl->authority ne $baseurl->authority) {
574                                 # too far apart, fall back to absolute URLs
575                                 $local_url = "$config{url}/";
576                                 $local_cgiurl = $config{cgiurl};
577                         }
578                 }
579
580                 $local_url =~ s{//$}{/};
581         }
582         else {
583                 $local_cgiurl = $config{cgiurl};
584         }
585
586         $config{wikistatedir}="$config{srcdir}/.ikiwiki"
587                 unless exists $config{wikistatedir} && defined $config{wikistatedir};
588
589         if (defined $config{umask}) {
590                 umask(possibly_foolish_untaint($config{umask}));
591         }
592
593         run_hooks(checkconfig => sub { shift->() });
594
595         return 1;
596 }
597
598 sub listplugins () {
599         my %ret;
600
601         foreach my $dir (@INC, $config{libdir}) {
602                 next unless defined $dir && length $dir;
603                 foreach my $file (glob("$dir/IkiWiki/Plugin/*.pm")) {
604                         my ($plugin)=$file=~/.*\/(.*)\.pm$/;
605                         $ret{$plugin}=1;
606                 }
607         }
608         foreach my $dir ($config{libdir}, "$installdir/lib/ikiwiki") {
609                 next unless defined $dir && length $dir;
610                 foreach my $file (glob("$dir/plugins/*")) {
611                         $ret{basename($file)}=1 if -x $file;
612                 }
613         }
614
615         return keys %ret;
616 }
617
618 sub loadplugins () {
619         if (defined $config{libdir} && length $config{libdir}) {
620                 unshift @INC, possibly_foolish_untaint($config{libdir});
621         }
622
623         foreach my $plugin (@{$config{default_plugins}}, @{$config{add_plugins}}) {
624                 loadplugin($plugin);
625         }
626         
627         if ($config{rcs}) {
628                 if (exists $hooks{rcs}) {
629                         error(gettext("cannot use multiple rcs plugins"));
630                 }
631                 loadplugin($config{rcs});
632         }
633         if (! exists $hooks{rcs}) {
634                 loadplugin("norcs");
635         }
636
637         run_hooks(getopt => sub { shift->() });
638         if (grep /^-/, @ARGV) {
639                 print STDERR "Unknown option (or missing parameter): $_\n"
640                         foreach grep /^-/, @ARGV;
641                 usage();
642         }
643
644         return 1;
645 }
646
647 sub loadplugin ($;$) {
648         my $plugin=shift;
649         my $force=shift;
650
651         return if ! $force && grep { $_ eq $plugin} @{$config{disable_plugins}};
652
653         foreach my $dir (defined $config{libdir} ? possibly_foolish_untaint($config{libdir}) : undef,
654                          "$installdir/lib/ikiwiki") {
655                 if (defined $dir && -x "$dir/plugins/$plugin") {
656                         eval { require IkiWiki::Plugin::external };
657                         if ($@) {
658                                 my $reason=$@;
659                                 error(sprintf(gettext("failed to load external plugin needed for %s plugin: %s"), $plugin, $reason));
660                         }
661                         import IkiWiki::Plugin::external "$dir/plugins/$plugin";
662                         $loaded_plugins{$plugin}=1;
663                         return 1;
664                 }
665         }
666
667         my $mod="IkiWiki::Plugin::".possibly_foolish_untaint($plugin);
668         eval qq{use $mod};
669         if ($@) {
670                 error("Failed to load plugin $mod: $@");
671         }
672         $loaded_plugins{$plugin}=1;
673         return 1;
674 }
675
676 sub error ($;$) {
677         my $message=shift;
678         my $cleaner=shift;
679         log_message('err' => $message) if $config{syslog};
680         if (defined $cleaner) {
681                 $cleaner->();
682         }
683         die $message."\n";
684 }
685
686 sub debug ($) {
687         return unless $config{verbose};
688         return log_message(debug => @_);
689 }
690
691 my $log_open=0;
692 sub log_message ($$) {
693         my $type=shift;
694
695         if ($config{syslog}) {
696                 require Sys::Syslog;
697                 if (! $log_open) {
698                         Sys::Syslog::setlogsock('unix');
699                         Sys::Syslog::openlog('ikiwiki', '', 'user');
700                         $log_open=1;
701                 }
702                 return eval {
703                         Sys::Syslog::syslog($type, "[$config{wikiname}] %s", join(" ", @_));
704                 };
705         }
706         elsif (! $config{cgi}) {
707                 return print "@_\n";
708         }
709         else {
710                 return print STDERR "@_\n";
711         }
712 }
713
714 sub possibly_foolish_untaint ($) {
715         my $tainted=shift;
716         my ($untainted)=$tainted=~/(.*)/s;
717         return $untainted;
718 }
719
720 sub basename ($) {
721         my $file=shift;
722
723         $file=~s!.*/+!!;
724         return $file;
725 }
726
727 sub dirname ($) {
728         my $file=shift;
729
730         $file=~s!/*[^/]+$!!;
731         return $file;
732 }
733
734 sub isinternal ($) {
735         my $page=shift;
736         return exists $pagesources{$page} &&
737                 $pagesources{$page} =~ /\._([^.]+)$/;
738 }
739
740 sub pagetype ($) {
741         my $file=shift;
742         
743         if ($file =~ /\.([^.]+)$/) {
744                 return $1 if exists $hooks{htmlize}{$1};
745         }
746         my $base=basename($file);
747         if (exists $hooks{htmlize}{$base} &&
748             $hooks{htmlize}{$base}{noextension}) {
749                 return $base;
750         }
751         return;
752 }
753
754 my %pagename_cache;
755
756 sub pagename ($) {
757         my $file=shift;
758
759         if (exists $pagename_cache{$file}) {
760                 return $pagename_cache{$file};
761         }
762
763         my $type=pagetype($file);
764         my $page=$file;
765         $page=~s/\Q.$type\E*$//
766                 if defined $type && !$hooks{htmlize}{$type}{keepextension}
767                         && !$hooks{htmlize}{$type}{noextension};
768         if ($config{indexpages} && $page=~/(.*)\/index$/) {
769                 $page=$1;
770         }
771
772         $pagename_cache{$file} = $page;
773         return $page;
774 }
775
776 sub newpagefile ($$) {
777         my $page=shift;
778         my $type=shift;
779
780         if (! $config{indexpages} || $page eq 'index') {
781                 return $page.".".$type;
782         }
783         else {
784                 return $page."/index.".$type;
785         }
786 }
787
788 sub targetpage ($$;$) {
789         my $page=shift;
790         my $ext=shift;
791         my $filename=shift;
792         
793         if (defined $filename) {
794                 return $page."/".$filename.".".$ext;
795         }
796         elsif (! $config{usedirs} || $page eq 'index') {
797                 return $page.".".$ext;
798         }
799         else {
800                 return $page."/index.".$ext;
801         }
802 }
803
804 sub htmlpage ($) {
805         my $page=shift;
806         
807         return targetpage($page, $config{htmlext});
808 }
809
810 sub srcfile_stat {
811         my $file=shift;
812         my $nothrow=shift;
813
814         return "$config{srcdir}/$file", stat(_) if -e "$config{srcdir}/$file";
815         foreach my $dir (@{$config{underlaydirs}}, $config{underlaydir}) {
816                 return "$dir/$file", stat(_) if -e "$dir/$file";
817         }
818         error("internal error: $file cannot be found in $config{srcdir} or underlay") unless $nothrow;
819         return;
820 }
821
822 sub srcfile ($;$) {
823         return (srcfile_stat(@_))[0];
824 }
825
826 sub add_literal_underlay ($) {
827         my $dir=shift;
828
829         if (! grep { $_ eq $dir } @{$config{underlaydirs}}) {
830                 unshift @{$config{underlaydirs}}, $dir;
831         }
832 }
833
834 sub add_underlay ($) {
835         my $dir = shift;
836
837         if ($dir !~ /^\//) {
838                 $dir="$config{underlaydirbase}/$dir";
839         }
840
841         add_literal_underlay($dir);
842         # why does it return 1? we just don't know
843         return 1;
844 }
845
846 sub readfile ($;$$) {
847         my $file=shift;
848         my $binary=shift;
849         my $wantfd=shift;
850
851         if (-l $file) {
852                 error("cannot read a symlink ($file)");
853         }
854         
855         local $/=undef;
856         open (my $in, "<", $file) || error("failed to read $file: $!");
857         binmode($in) if ($binary);
858         return \*$in if $wantfd;
859         my $ret=<$in>;
860         # check for invalid utf-8, and toss it back to avoid crashes
861         if (! utf8::valid($ret)) {
862                 $ret=encode_utf8($ret);
863         }
864         close $in || error("failed to read $file: $!");
865         return $ret;
866 }
867
868 sub prep_writefile ($$) {
869         my $file=shift;
870         my $destdir=shift;
871         
872         my $test=$file;
873         while (length $test) {
874                 if (-l "$destdir/$test") {
875                         error("cannot write to a symlink ($test)");
876                 }
877                 if (-f _ && $test ne $file) {
878                         # Remove conflicting file.
879                         foreach my $p (keys %renderedfiles, keys %oldrenderedfiles) {
880                                 foreach my $f (@{$renderedfiles{$p}}, @{$oldrenderedfiles{$p}}) {
881                                         if ($f eq $test) {
882                                                 unlink("$destdir/$test");
883                                                 last;
884                                         }
885                                 }
886                         }
887                 }
888                 $test=dirname($test);
889         }
890
891         my $dir=dirname("$destdir/$file");
892         if (! -d $dir) {
893                 my $d="";
894                 foreach my $s (split(m!/+!, $dir)) {
895                         $d.="$s/";
896                         if (! -d $d) {
897                                 mkdir($d) || error("failed to create directory $d: $!");
898                         }
899                 }
900         }
901
902         return 1;
903 }
904
905 sub writefile ($$$;$$) {
906         my $file=shift; # can include subdirs
907         my $destdir=shift; # directory to put file in
908         my $content=shift;
909         my $binary=shift;
910         my $writer=shift;
911         
912         prep_writefile($file, $destdir);
913         
914         my $newfile="$destdir/$file.ikiwiki-new";
915         if (-l $newfile) {
916                 error("cannot write to a symlink ($newfile)");
917         }
918         
919         my $cleanup = sub { unlink($newfile) };
920         open (my $out, '>', $newfile) || error("failed to write $newfile: $!", $cleanup);
921         binmode($out) if ($binary);
922         if ($writer) {
923                 $writer->(\*$out, $cleanup);
924         }
925         else {
926                 print $out $content or error("failed writing to $newfile: $!", $cleanup);
927         }
928         close $out || error("failed saving $newfile: $!", $cleanup);
929         rename($newfile, "$destdir/$file") || 
930                 error("failed renaming $newfile to $destdir/$file: $!", $cleanup);
931
932         return 1;
933 }
934
935 my %cleared;
936 sub will_render ($$;$) {
937         my $page=shift;
938         my $dest=shift;
939         my $clear=shift;
940
941         # Important security check for independently created files.
942         if (-e "$config{destdir}/$dest" && ! $config{rebuild} &&
943             ! grep { $_ eq $dest } (@{$renderedfiles{$page}}, @{$oldrenderedfiles{$page}}, @{$wikistate{editpage}{previews}})) {
944                 my $from_other_page=0;
945                 # Expensive, but rarely runs.
946                 foreach my $p (keys %renderedfiles, keys %oldrenderedfiles) {
947                         if (grep {
948                                 $_ eq $dest ||
949                                 dirname($_) eq $dest
950                             } @{$renderedfiles{$p}}, @{$oldrenderedfiles{$p}}) {
951                                 $from_other_page=1;
952                                 last;
953                         }
954                 }
955
956                 error("$config{destdir}/$dest independently created, not overwriting with version from $page")
957                         unless $from_other_page;
958         }
959
960         # If $dest exists as a directory, remove conflicting files in it
961         # rendered from other pages.
962         if (-d _) {
963                 foreach my $p (keys %renderedfiles, keys %oldrenderedfiles) {
964                         foreach my $f (@{$renderedfiles{$p}}, @{$oldrenderedfiles{$p}}) {
965                                 if (dirname($f) eq $dest) {
966                                         unlink("$config{destdir}/$f");
967                                         rmdir(dirname("$config{destdir}/$f"));
968                                 }
969                         }
970                 }
971         }
972
973         if (! $clear || $cleared{$page}) {
974                 $renderedfiles{$page}=[$dest, grep { $_ ne $dest } @{$renderedfiles{$page}}];
975         }
976         else {
977                 foreach my $old (@{$renderedfiles{$page}}) {
978                         delete $destsources{$old};
979                 }
980                 $renderedfiles{$page}=[$dest];
981                 $cleared{$page}=1;
982         }
983         $destsources{$dest}=$page;
984
985         return 1;
986 }
987
988 sub bestlink ($$) {
989         my $page=shift;
990         my $link=shift;
991         
992         my $cwd=$page;
993         if ($link=~s/^\/+//) {
994                 # absolute links
995                 $cwd="";
996         }
997         $link=~s/\/$//;
998
999         do {
1000                 my $l=$cwd;
1001                 $l.="/" if length $l;
1002                 $l.=$link;
1003
1004                 if (exists $pagesources{$l}) {
1005                         return $l;
1006                 }
1007                 elsif (exists $pagecase{lc $l}) {
1008                         return $pagecase{lc $l};
1009                 }
1010         } while $cwd=~s{/?[^/]+$}{};
1011
1012         if (length $config{userdir}) {
1013                 my $l = "$config{userdir}/".lc($link);
1014                 if (exists $pagesources{$l}) {
1015                         return $l;
1016                 }
1017                 elsif (exists $pagecase{lc $l}) {
1018                         return $pagecase{lc $l};
1019                 }
1020         }
1021
1022         #print STDERR "warning: page $page, broken link: $link\n";
1023         return "";
1024 }
1025
1026 sub isinlinableimage ($) {
1027         my $file=shift;
1028         
1029         return $file =~ /\.(png|gif|jpg|jpeg)$/i;
1030 }
1031
1032 sub pagetitle ($;$) {
1033         my $page=shift;
1034         my $unescaped=shift;
1035
1036         if ($unescaped) {
1037                 $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : chr($2)/eg;
1038         }
1039         else {
1040                 $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : "&#$2;"/eg;
1041         }
1042
1043         return $page;
1044 }
1045
1046 sub titlepage ($) {
1047         my $title=shift;
1048         # support use w/o %config set
1049         my $chars = defined $config{wiki_file_chars} ? $config{wiki_file_chars} : "-[:alnum:]+/.:_";
1050         $title=~s/([^$chars]|_)/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
1051         return $title;
1052 }
1053
1054 sub linkpage ($) {
1055         my $link=shift;
1056         my $chars = defined $config{wiki_file_chars} ? $config{wiki_file_chars} : "-[:alnum:]+/.:_";
1057         $link=~s/([^$chars])/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
1058         return $link;
1059 }
1060
1061 sub cgiurl (@) {
1062         my %params=@_;
1063
1064         my $cgiurl=$local_cgiurl;
1065
1066         if (exists $params{cgiurl}) {
1067                 $cgiurl=$params{cgiurl};
1068                 delete $params{cgiurl};
1069         }
1070
1071         unless (%params) {
1072                 return $cgiurl;
1073         }
1074
1075         return $cgiurl."?".
1076                 join("&amp;", map $_."=".uri_escape_utf8($params{$_}), keys %params);
1077 }
1078
1079 sub baseurl (;$) {
1080         my $page=shift;
1081
1082         return $local_url if ! defined $page;
1083         
1084         $page=htmlpage($page);
1085         $page=~s/[^\/]+$//;
1086         $page=~s/[^\/]+\//..\//g;
1087         return $page;
1088 }
1089
1090 sub urlabs ($$) {
1091         my $url=shift;
1092         my $urlbase=shift;
1093
1094         return $url unless defined $urlbase && length $urlbase;
1095
1096         eval q{use URI};
1097         URI->new_abs($url, $urlbase)->as_string;
1098 }
1099
1100 sub abs2rel ($$) {
1101         # Work around very innefficient behavior in File::Spec if abs2rel
1102         # is passed two relative paths. It's much faster if paths are
1103         # absolute! (Debian bug #376658; fixed in debian unstable now)
1104         my $path="/".shift;
1105         my $base="/".shift;
1106
1107         require File::Spec;
1108         my $ret=File::Spec->abs2rel($path, $base);
1109         $ret=~s/^// if defined $ret;
1110         return $ret;
1111 }
1112
1113 sub displaytime ($;$$) {
1114         # Plugins can override this function to mark up the time to
1115         # display.
1116         my $time=formattime($_[0], $_[1]);
1117         if ($config{html5}) {
1118                 return '<time datetime="'.date_3339($_[0]).'"'.
1119                         ($_[2] ? ' pubdate="pubdate"' : '').
1120                         '>'.$time.'</time>';
1121         }
1122         else {
1123                 return '<span class="date">'.$time.'</span>';
1124         }
1125 }
1126
1127 sub formattime ($;$) {
1128         # Plugins can override this function to format the time.
1129         my $time=shift;
1130         my $format=shift;
1131         if (! defined $format) {
1132                 $format=$config{timeformat};
1133         }
1134
1135         # strftime doesn't know about encodings, so make sure
1136         # its output is properly treated as utf8
1137         return decode_utf8(POSIX::strftime($format, localtime($time)));
1138 }
1139
1140 sub date_3339 ($) {
1141         my $time=shift;
1142
1143         my $lc_time=POSIX::setlocale(&POSIX::LC_TIME);
1144         POSIX::setlocale(&POSIX::LC_TIME, "C");
1145         my $ret=POSIX::strftime("%Y-%m-%dT%H:%M:%SZ", gmtime($time));
1146         POSIX::setlocale(&POSIX::LC_TIME, $lc_time);
1147         return $ret;
1148 }
1149
1150 sub beautify_urlpath ($) {
1151         my $url=shift;
1152
1153         # Ensure url is not an empty link, and if necessary,
1154         # add ./ to avoid colon confusion.
1155         if ($url !~ /^\// && $url !~ /^\.\.?\//) {
1156                 $url="./$url";
1157         }
1158
1159         if ($config{usedirs}) {
1160                 $url =~ s!/index.$config{htmlext}$!/!;
1161         }
1162
1163         return $url;
1164 }
1165
1166 sub urlto ($;$$) {
1167         my $to=shift;
1168         my $from=shift;
1169         my $absolute=shift;
1170         
1171         if (! length $to) {
1172                 $to = 'index';
1173         }
1174
1175         if (! $destsources{$to}) {
1176                 $to=htmlpage($to);
1177         }
1178
1179         if ($absolute) {
1180                 return $config{url}.beautify_urlpath("/".$to);
1181         }
1182
1183         if (! defined $from) {
1184                 my $u = $local_url || '';
1185                 $u =~ s{/$}{};
1186                 return $u.beautify_urlpath("/".$to);
1187         }
1188
1189         my $link = abs2rel($to, dirname(htmlpage($from)));
1190
1191         return beautify_urlpath($link);
1192 }
1193
1194 sub isselflink ($$) {
1195         # Plugins can override this function to support special types
1196         # of selflinks.
1197         my $page=shift;
1198         my $link=shift;
1199
1200         return $page eq $link;
1201 }
1202
1203 sub htmllink ($$$;@) {
1204         my $lpage=shift; # the page doing the linking
1205         my $page=shift; # the page that will contain the link (different for inline)
1206         my $link=shift;
1207         my %opts=@_;
1208
1209         $link=~s/\/$//;
1210
1211         my $bestlink;
1212         if (! $opts{forcesubpage}) {
1213                 $bestlink=bestlink($lpage, $link);
1214         }
1215         else {
1216                 $bestlink="$lpage/".lc($link);
1217         }
1218
1219         my $linktext;
1220         if (defined $opts{linktext}) {
1221                 $linktext=$opts{linktext};
1222         }
1223         else {
1224                 $linktext=pagetitle(basename($link));
1225         }
1226         
1227         return "<span class=\"selflink\">$linktext</span>"
1228                 if length $bestlink && isselflink($page, $bestlink) &&
1229                    ! defined $opts{anchor};
1230         
1231         if (! $destsources{$bestlink}) {
1232                 $bestlink=htmlpage($bestlink);
1233
1234                 if (! $destsources{$bestlink}) {
1235                         my $cgilink = "";
1236                         if (length $config{cgiurl}) {
1237                                 $cgilink = "<a href=\"".
1238                                         cgiurl(
1239                                                 do => "create",
1240                                                 page => lc($link),
1241                                                 from => $lpage
1242                                         )."\" rel=\"nofollow\">?</a>";
1243                         }
1244                         return "<span class=\"createlink\">$cgilink$linktext</span>"
1245                 }
1246         }
1247         
1248         $bestlink=abs2rel($bestlink, dirname(htmlpage($page)));
1249         $bestlink=beautify_urlpath($bestlink);
1250         
1251         if (! $opts{noimageinline} && isinlinableimage($bestlink)) {
1252                 return "<img src=\"$bestlink\" alt=\"$linktext\" />";
1253         }
1254
1255         if (defined $opts{anchor}) {
1256                 $bestlink.="#".$opts{anchor};
1257         }
1258
1259         my @attrs;
1260         foreach my $attr (qw{rel class title}) {
1261                 if (defined $opts{$attr}) {
1262                         push @attrs, " $attr=\"$opts{$attr}\"";
1263                 }
1264         }
1265
1266         return "<a href=\"$bestlink\"@attrs>$linktext</a>";
1267 }
1268
1269 sub userpage ($) {
1270         my $user=shift;
1271         return length $config{userdir} ? "$config{userdir}/$user" : $user;
1272 }
1273
1274 sub openiduser ($) {
1275         my $user=shift;
1276
1277         if (defined $user && $user =~ m!^https?://! &&
1278             eval q{use Net::OpenID::VerifiedIdentity; 1} && !$@) {
1279                 my $display;
1280
1281                 if (Net::OpenID::VerifiedIdentity->can("DisplayOfURL")) {
1282                         $display = Net::OpenID::VerifiedIdentity::DisplayOfURL($user);
1283                 }
1284                 else {
1285                         # backcompat with old version
1286                         my $oid=Net::OpenID::VerifiedIdentity->new(identity => $user);
1287                         $display=$oid->display;
1288                 }
1289
1290                 # Convert "user.somehost.com" to "user [somehost.com]"
1291                 # (also "user.somehost.co.uk")
1292                 if ($display !~ /\[/) {
1293                         $display=~s/^([-a-zA-Z0-9]+?)\.([-.a-zA-Z0-9]+\.[a-z]+)$/$1 [$2]/;
1294                 }
1295                 # Convert "http://somehost.com/user" to "user [somehost.com]".
1296                 # (also "https://somehost.com/user/")
1297                 if ($display !~ /\[/) {
1298                         $display=~s/^https?:\/\/(.+)\/([^\/#?]+)\/?(?:[#?].*)?$/$2 [$1]/;
1299                 }
1300                 $display=~s!^https?://!!; # make sure this is removed
1301                 eval q{use CGI 'escapeHTML'};
1302                 error($@) if $@;
1303                 return escapeHTML($display);
1304         }
1305         return;
1306 }
1307
1308 sub htmlize ($$$$) {
1309         my $page=shift;
1310         my $destpage=shift;
1311         my $type=shift;
1312         my $content=shift;
1313         
1314         my $oneline = $content !~ /\n/;
1315         
1316         if (exists $hooks{htmlize}{$type}) {
1317                 $content=$hooks{htmlize}{$type}{call}->(
1318                         page => $page,
1319                         content => $content,
1320                 );
1321         }
1322         else {
1323                 error("htmlization of $type not supported");
1324         }
1325
1326         run_hooks(sanitize => sub {
1327                 $content=shift->(
1328                         page => $page,
1329                         destpage => $destpage,
1330                         content => $content,
1331                 );
1332         });
1333         
1334         if ($oneline) {
1335                 # hack to get rid of enclosing junk added by markdown
1336                 # and other htmlizers/sanitizers
1337                 $content=~s/^<p>//i;
1338                 $content=~s/<\/p>\n*$//i;
1339         }
1340
1341         return $content;
1342 }
1343
1344 sub linkify ($$$) {
1345         my $page=shift;
1346         my $destpage=shift;
1347         my $content=shift;
1348
1349         run_hooks(linkify => sub {
1350                 $content=shift->(
1351                         page => $page,
1352                         destpage => $destpage,
1353                         content => $content,
1354                 );
1355         });
1356         
1357         return $content;
1358 }
1359
1360 our %preprocessing;
1361 our $preprocess_preview=0;
1362 sub preprocess ($$$;$$) {
1363         my $page=shift; # the page the data comes from
1364         my $destpage=shift; # the page the data will appear in (different for inline)
1365         my $content=shift;
1366         my $scan=shift;
1367         my $preview=shift;
1368
1369         # Using local because it needs to be set within any nested calls
1370         # of this function.
1371         local $preprocess_preview=$preview if defined $preview;
1372
1373         my $handle=sub {
1374                 my $escape=shift;
1375                 my $prefix=shift;
1376                 my $command=shift;
1377                 my $params=shift;
1378                 $params="" if ! defined $params;
1379
1380                 if (length $escape) {
1381                         return "[[$prefix$command $params]]";
1382                 }
1383                 elsif (exists $hooks{preprocess}{$command}) {
1384                         return "" if $scan && ! $hooks{preprocess}{$command}{scan};
1385                         # Note: preserve order of params, some plugins may
1386                         # consider it significant.
1387                         my @params;
1388                         while ($params =~ m{
1389                                 (?:([-\w]+)=)?          # 1: named parameter key?
1390                                 (?:
1391                                         """(.*?)"""     # 2: triple-quoted value
1392                                 |
1393                                         "([^"]*?)"      # 3: single-quoted value
1394                                 |
1395                                         '''(.*?)'''     # 4: triple-single-quote
1396                                 |
1397                                         <<(?<start>[a-zA-Z]+)\n(?<heredoc>.*?)\n\k<start> # 5, 6: heredoc'd value.
1398                                 |
1399                                         (\S+)           # 7: unquoted value
1400                                 )
1401                                 (?:\s+|$)               # delimiter to next param
1402                         }msgx) {
1403                                 my $key=$1;
1404                                 my $val;
1405                                 if (defined $2) {
1406                                         $val=$2;
1407                                         $val=~s/\r\n/\n/mg;
1408                                         $val=~s/^\n+//g;
1409                                         $val=~s/\n+$//g;
1410                                 }
1411                                 elsif (defined $3) {
1412                                         $val=$3;
1413                                 }
1414                                 elsif (defined $4) {
1415                                         $val=$4;
1416                                 }
1417                                 elsif (defined $7) {
1418                                         $val=$7;
1419                                 }
1420                                 elsif (defined $+{heredoc}) {
1421                                         $val=$+{heredoc};
1422                                 }
1423
1424                                 if (defined $key) {
1425                                         push @params, $key, $val;
1426                                 }
1427                                 else {
1428                                         push @params, $val, '';
1429                                 }
1430                         }
1431                         if ($preprocessing{$page}++ > 3) {
1432                                 # Avoid loops of preprocessed pages preprocessing
1433                                 # other pages that preprocess them, etc.
1434                                 return "[[!$command <span class=\"error\">".
1435                                         sprintf(gettext("preprocessing loop detected on %s at depth %i"),
1436                                                 $page, $preprocessing{$page}).
1437                                         "</span>]]";
1438                         }
1439                         my $ret;
1440                         if (! $scan) {
1441                                 $ret=eval {
1442                                         $hooks{preprocess}{$command}{call}->(
1443                                                 @params,
1444                                                 page => $page,
1445                                                 destpage => $destpage,
1446                                                 preview => $preprocess_preview,
1447                                         );
1448                                 };
1449                                 if ($@) {
1450                                         my $error=$@;
1451                                         chomp $error;
1452                                         $ret="[[!$command <span class=\"error\">".
1453                                                 gettext("Error").": $error"."</span>]]";
1454                                 }
1455                         }
1456                         else {
1457                                 # use void context during scan pass
1458                                 eval {
1459                                         $hooks{preprocess}{$command}{call}->(
1460                                                 @params,
1461                                                 page => $page,
1462                                                 destpage => $destpage,
1463                                                 preview => $preprocess_preview,
1464                                         );
1465                                 };
1466                                 $ret="";
1467                         }
1468                         $preprocessing{$page}--;
1469                         return $ret;
1470                 }
1471                 else {
1472                         return "[[$prefix$command $params]]";
1473                 }
1474         };
1475         
1476         my $regex;
1477         if ($config{prefix_directives}) {
1478                 $regex = qr{
1479                         (\\?)           # 1: escape?
1480                         \[\[(!)         # directive open; 2: prefix
1481                         ([-\w]+)        # 3: command
1482                         (               # 4: the parameters..
1483                                 \s+     # Must have space if parameters present
1484                                 (?:
1485                                         (?:[-\w]+=)?            # named parameter key?
1486                                         (?:
1487                                                 """.*?"""       # triple-quoted value
1488                                                 |
1489                                                 "[^"]*?"        # single-quoted value
1490                                                 |
1491                                                 <<(?<start>[a-zA-Z]+)\n(?<heredoc>.*?)\n\k<start> # heredoc'd value.
1492                                                 |
1493                                                 '''.*?''' # triple-single-quoted value
1494                                                 |
1495                                                 [^"\s\]]+       # unquoted value
1496                                         )
1497                                         \s*                     # whitespace or end
1498                                                                 # of directive
1499                                 )
1500                         *)?             # 0 or more parameters
1501                         \]\]            # directive closed
1502                 }sx;
1503         }
1504         else {
1505                 $regex = qr{
1506                         (\\?)           # 1: escape?
1507                         \[\[(!?)        # directive open; 2: optional prefix
1508                         ([-\w]+)        # 3: command
1509                         \s+
1510                         (               # 4: the parameters..
1511                                 (?:
1512                                         (?:[-\w]+=)?            # named parameter key?
1513                                         (?:
1514                                                 """.*?"""       # triple-quoted value
1515                                                 |
1516                                                 "[^"]*?"        # single-quoted value
1517                                                 |
1518                                                 '''.*?'''       # triple-single-quoted value
1519                                                 |
1520                                                 <<(?<start>[a-zA-Z]+)\n(?<heredoc>.*?)\n\k<start> # heredoc'd value.
1521                                                 |
1522                                                 [^"\s\]]+       # unquoted value
1523                                         )
1524                                         \s*                     # whitespace or end
1525                                                                 # of directive
1526                                 )
1527                         *)              # 0 or more parameters
1528                         \]\]            # directive closed
1529                 }sx;
1530         }
1531
1532         $content =~ s{$regex}{$handle->($1, $2, $3, $4)}eg;
1533         return $content;
1534 }
1535
1536 sub filter ($$$) {
1537         my $page=shift;
1538         my $destpage=shift;
1539         my $content=shift;
1540
1541         run_hooks(filter => sub {
1542                 $content=shift->(page => $page, destpage => $destpage, 
1543                         content => $content);
1544         });
1545
1546         return $content;
1547 }
1548
1549 sub check_canedit ($$$;$) {
1550         my $page=shift;
1551         my $q=shift;
1552         my $session=shift;
1553         my $nonfatal=shift;
1554         
1555         my $canedit;
1556         run_hooks(canedit => sub {
1557                 return if defined $canedit;
1558                 my $ret=shift->($page, $q, $session);
1559                 if (defined $ret) {
1560                         if ($ret eq "") {
1561                                 $canedit=1;
1562                         }
1563                         elsif (ref $ret eq 'CODE') {
1564                                 $ret->() unless $nonfatal;
1565                                 $canedit=0;
1566                         }
1567                         elsif (defined $ret) {
1568                                 error($ret) unless $nonfatal;
1569                                 $canedit=0;
1570                         }
1571                 }
1572         });
1573         return defined $canedit ? $canedit : 1;
1574 }
1575
1576 sub check_content (@) {
1577         my %params=@_;
1578         
1579         return 1 if ! exists $hooks{checkcontent}; # optimisation
1580
1581         if (exists $pagesources{$params{page}}) {
1582                 my @diff;
1583                 my %old=map { $_ => 1 }
1584                         split("\n", readfile(srcfile($pagesources{$params{page}})));
1585                 foreach my $line (split("\n", $params{content})) {
1586                         push @diff, $line if ! exists $old{$line};
1587                 }
1588                 $params{diff}=join("\n", @diff);
1589         }
1590
1591         my $ok;
1592         run_hooks(checkcontent => sub {
1593                 return if defined $ok;
1594                 my $ret=shift->(%params);
1595                 if (defined $ret) {
1596                         if ($ret eq "") {
1597                                 $ok=1;
1598                         }
1599                         elsif (ref $ret eq 'CODE') {
1600                                 $ret->() unless $params{nonfatal};
1601                                 $ok=0;
1602                         }
1603                         elsif (defined $ret) {
1604                                 error($ret) unless $params{nonfatal};
1605                                 $ok=0;
1606                         }
1607                 }
1608
1609         });
1610         return defined $ok ? $ok : 1;
1611 }
1612
1613 sub check_canchange (@) {
1614         my %params = @_;
1615         my $cgi = $params{cgi};
1616         my $session = $params{session};
1617         my @changes = @{$params{changes}};
1618
1619         my %newfiles;
1620         foreach my $change (@changes) {
1621                 # This untaint is safe because we check file_pruned and
1622                 # wiki_file_regexp.
1623                 my ($file)=$change->{file}=~/$config{wiki_file_regexp}/;
1624                 $file=possibly_foolish_untaint($file);
1625                 if (! defined $file || ! length $file ||
1626                     file_pruned($file)) {
1627                         error(gettext("bad file name %s"), $file);
1628                 }
1629
1630                 my $type=pagetype($file);
1631                 my $page=pagename($file) if defined $type;
1632
1633                 if ($change->{action} eq 'add') {
1634                         $newfiles{$file}=1;
1635                 }
1636
1637                 if ($change->{action} eq 'change' ||
1638                     $change->{action} eq 'add') {
1639                         if (defined $page) {
1640                                 check_canedit($page, $cgi, $session);
1641                                 next;
1642                         }
1643                         else {
1644                                 if (IkiWiki::Plugin::attachment->can("check_canattach")) {
1645                                         IkiWiki::Plugin::attachment::check_canattach($session, $file, $change->{path});
1646                                         check_canedit($file, $cgi, $session);
1647                                         next;
1648                                 }
1649                         }
1650                 }
1651                 elsif ($change->{action} eq 'remove') {
1652                         # check_canremove tests to see if the file is present
1653                         # on disk. This will fail when a single commit adds a
1654                         # file and then removes it again. Avoid the problem
1655                         # by not testing the removal in such pairs of changes.
1656                         # (The add is still tested, just to make sure that
1657                         # no data is added to the repo that a web edit
1658                         # could not add.)
1659                         next if $newfiles{$file};
1660
1661                         if (IkiWiki::Plugin::remove->can("check_canremove")) {
1662                                 IkiWiki::Plugin::remove::check_canremove(defined $page ? $page : $file, $cgi, $session);
1663                                 check_canedit(defined $page ? $page : $file, $cgi, $session);
1664                                 next;
1665                         }
1666                 }
1667                 else {
1668                         error "unknown action ".$change->{action};
1669                 }
1670
1671                 error sprintf(gettext("you are not allowed to change %s"), $file);
1672         }
1673 }
1674
1675
1676 my $wikilock;
1677
1678 sub lockwiki () {
1679         # Take an exclusive lock on the wiki to prevent multiple concurrent
1680         # run issues. The lock will be dropped on program exit.
1681         if (! -d $config{wikistatedir}) {
1682                 mkdir($config{wikistatedir});
1683         }
1684         open($wikilock, '>', "$config{wikistatedir}/lockfile") ||
1685                 error ("cannot write to $config{wikistatedir}/lockfile: $!");
1686         if (! flock($wikilock, 2)) { # LOCK_EX
1687                 error("failed to get lock");
1688         }
1689         return 1;
1690 }
1691
1692 sub unlockwiki () {
1693         POSIX::close($ENV{IKIWIKI_CGILOCK_FD}) if exists $ENV{IKIWIKI_CGILOCK_FD};
1694         return close($wikilock) if $wikilock;
1695         return;
1696 }
1697
1698 my $commitlock;
1699
1700 sub commit_hook_enabled () {
1701         open($commitlock, '+>', "$config{wikistatedir}/commitlock") ||
1702                 error("cannot write to $config{wikistatedir}/commitlock: $!");
1703         if (! flock($commitlock, 1 | 4)) { # LOCK_SH | LOCK_NB to test
1704                 close($commitlock) || error("failed closing commitlock: $!");
1705                 return 0;
1706         }
1707         close($commitlock) || error("failed closing commitlock: $!");
1708         return 1;
1709 }
1710
1711 sub disable_commit_hook () {
1712         open($commitlock, '>', "$config{wikistatedir}/commitlock") ||
1713                 error("cannot write to $config{wikistatedir}/commitlock: $!");
1714         if (! flock($commitlock, 2)) { # LOCK_EX
1715                 error("failed to get commit lock");
1716         }
1717         return 1;
1718 }
1719
1720 sub enable_commit_hook () {
1721         return close($commitlock) if $commitlock;
1722         return;
1723 }
1724
1725 sub loadindex () {
1726         %oldrenderedfiles=%pagectime=();
1727         if (! $config{rebuild}) {
1728                 %pagesources=%pagemtime=%oldlinks=%links=%depends=
1729                 %destsources=%renderedfiles=%pagecase=%pagestate=
1730                 %depends_simple=%typedlinks=%oldtypedlinks=();
1731         }
1732         my $in;
1733         if (! open ($in, "<", "$config{wikistatedir}/indexdb")) {
1734                 if (-e "$config{wikistatedir}/index") {
1735                         system("ikiwiki-transition", "indexdb", $config{srcdir});
1736                         open ($in, "<", "$config{wikistatedir}/indexdb") || return;
1737                 }
1738                 else {
1739                         $config{gettime}=1; # first build
1740                         return;
1741                 }
1742         }
1743
1744         my $index=Storable::fd_retrieve($in);
1745         if (! defined $index) {
1746                 return 0;
1747         }
1748
1749         my $pages;
1750         if (exists $index->{version} && ! ref $index->{version}) {
1751                 $pages=$index->{page};
1752                 %wikistate=%{$index->{state}};
1753                 # Handle plugins that got disabled by loading a new setup.
1754                 if (exists $config{setupfile}) {
1755                         require IkiWiki::Setup;
1756                         IkiWiki::Setup::disabled_plugins(
1757                                 grep { ! $loaded_plugins{$_} } keys %wikistate);
1758                 }
1759         }
1760         else {
1761                 $pages=$index;
1762                 %wikistate=();
1763         }
1764
1765         foreach my $src (keys %$pages) {
1766                 my $d=$pages->{$src};
1767                 my $page=pagename($src);
1768                 $pagectime{$page}=$d->{ctime};
1769                 $pagesources{$page}=$src;
1770                 if (! $config{rebuild}) {
1771                         $pagemtime{$page}=$d->{mtime};
1772                         $renderedfiles{$page}=$d->{dest};
1773                         if (exists $d->{links} && ref $d->{links}) {
1774                                 $links{$page}=$d->{links};
1775                                 $oldlinks{$page}=[@{$d->{links}}];
1776                         }
1777                         if (ref $d->{depends_simple} eq 'ARRAY') {
1778                                 # old format
1779                                 $depends_simple{$page}={
1780                                         map { $_ => 1 } @{$d->{depends_simple}}
1781                                 };
1782                         }
1783                         elsif (exists $d->{depends_simple}) {
1784                                 $depends_simple{$page}=$d->{depends_simple};
1785                         }
1786                         if (exists $d->{dependslist}) {
1787                                 # old format
1788                                 $depends{$page}={
1789                                         map { $_ => $DEPEND_CONTENT }
1790                                                 @{$d->{dependslist}}
1791                                 };
1792                         }
1793                         elsif (exists $d->{depends} && ! ref $d->{depends}) {
1794                                 # old format
1795                                 $depends{$page}={$d->{depends} => $DEPEND_CONTENT };
1796                         }
1797                         elsif (exists $d->{depends}) {
1798                                 $depends{$page}=$d->{depends};
1799                         }
1800                         if (exists $d->{state}) {
1801                                 $pagestate{$page}=$d->{state};
1802                         }
1803                         if (exists $d->{typedlinks}) {
1804                                 $typedlinks{$page}=$d->{typedlinks};
1805
1806                                 while (my ($type, $links) = each %{$typedlinks{$page}}) {
1807                                         next unless %$links;
1808                                         $oldtypedlinks{$page}{$type} = {%$links};
1809                                 }
1810                         }
1811                 }
1812                 $oldrenderedfiles{$page}=[@{$d->{dest}}];
1813         }
1814         foreach my $page (keys %pagesources) {
1815                 $pagecase{lc $page}=$page;
1816         }
1817         foreach my $page (keys %renderedfiles) {
1818                 $destsources{$_}=$page foreach @{$renderedfiles{$page}};
1819         }
1820         return close($in);
1821 }
1822
1823 sub saveindex () {
1824         run_hooks(savestate => sub { shift->() });
1825
1826         my @plugins=keys %loaded_plugins;
1827
1828         if (! -d $config{wikistatedir}) {
1829                 mkdir($config{wikistatedir});
1830         }
1831         my $newfile="$config{wikistatedir}/indexdb.new";
1832         my $cleanup = sub { unlink($newfile) };
1833         open (my $out, '>', $newfile) || error("cannot write to $newfile: $!", $cleanup);
1834
1835         my %index;
1836         foreach my $page (keys %pagemtime) {
1837                 next unless $pagemtime{$page};
1838                 my $src=$pagesources{$page};
1839
1840                 $index{page}{$src}={
1841                         ctime => $pagectime{$page},
1842                         mtime => $pagemtime{$page},
1843                         dest => $renderedfiles{$page},
1844                         links => $links{$page},
1845                 };
1846
1847                 if (exists $depends{$page}) {
1848                         $index{page}{$src}{depends} = $depends{$page};
1849                 }
1850
1851                 if (exists $depends_simple{$page}) {
1852                         $index{page}{$src}{depends_simple} = $depends_simple{$page};
1853                 }
1854
1855                 if (exists $typedlinks{$page} && %{$typedlinks{$page}}) {
1856                         $index{page}{$src}{typedlinks} = $typedlinks{$page};
1857                 }
1858
1859                 if (exists $pagestate{$page}) {
1860                         foreach my $id (@plugins) {
1861                                 foreach my $key (keys %{$pagestate{$page}{$id}}) {
1862                                         $index{page}{$src}{state}{$id}{$key}=$pagestate{$page}{$id}{$key};
1863                                 }
1864                         }
1865                 }
1866         }
1867
1868         $index{state}={};
1869         foreach my $id (@plugins) {
1870                 $index{state}{$id}={}; # used to detect disabled plugins
1871                 foreach my $key (keys %{$wikistate{$id}}) {
1872                         $index{state}{$id}{$key}=$wikistate{$id}{$key};
1873                 }
1874         }
1875         
1876         $index{version}="3";
1877         my $ret=Storable::nstore_fd(\%index, $out);
1878         return if ! defined $ret || ! $ret;
1879         close $out || error("failed saving to $newfile: $!", $cleanup);
1880         rename($newfile, "$config{wikistatedir}/indexdb") ||
1881                 error("failed renaming $newfile to $config{wikistatedir}/indexdb", $cleanup);
1882         
1883         return 1;
1884 }
1885
1886 sub template_file ($) {
1887         my $name=shift;
1888         
1889         my $tpage=($name =~ s/^\///) ? $name : "templates/$name";
1890         my $template;
1891         if ($name !~ /\.tmpl$/ && exists $pagesources{$tpage}) {
1892                 $template=srcfile($pagesources{$tpage}, 1);
1893                 $name.=".tmpl";
1894         }
1895         else {
1896                 $template=srcfile($tpage, 1);
1897         }
1898
1899         if (defined $template) {
1900                 return $template, $tpage, 1 if wantarray;
1901                 return $template;
1902         }
1903         else {
1904                 $name=~s:/::; # avoid path traversal
1905                 foreach my $dir ($config{templatedir},
1906                                  "$installdir/share/ikiwiki/templates") {
1907                         if (-e "$dir/$name") {
1908                                 $template="$dir/$name";
1909                                 last;
1910                         }
1911                 }
1912                 if (defined $template) {        
1913                         return $template, $tpage if wantarray;
1914                         return $template;
1915                 }
1916         }
1917
1918         return;
1919 }
1920
1921 sub template_depends ($$;@) {
1922         my $name=shift;
1923         my $page=shift;
1924         
1925         my ($filename, $tpage, $untrusted)=template_file($name);
1926         if (! defined $filename) {
1927                 error(sprintf(gettext("template %s not found"), $name))
1928         }
1929
1930         if (defined $page && defined $tpage) {
1931                 add_depends($page, $tpage);
1932         }
1933         
1934         my @opts=(
1935                 filter => sub {
1936                         my $text_ref = shift;
1937                         ${$text_ref} = decode_utf8(${$text_ref});
1938                 },
1939                 loop_context_vars => 1,
1940                 die_on_bad_params => 0,
1941                 parent_global_vars => 1,
1942                 filename => $filename,
1943                 @_,
1944                 ($untrusted ? (no_includes => 1) : ()),
1945         );
1946         return @opts if wantarray;
1947
1948         require HTML::Template;
1949         return HTML::Template->new(@opts);
1950 }
1951
1952 sub template ($;@) {
1953         template_depends(shift, undef, @_);
1954 }
1955
1956 sub templateactions ($$) {
1957         my $template=shift;
1958         my $page=shift;
1959
1960         my $have_actions=0;
1961         my @actions;
1962         run_hooks(pageactions => sub {
1963                 push @actions, map { { action => $_ } } 
1964                         grep { defined } shift->(page => $page);
1965         });
1966         $template->param(actions => \@actions);
1967
1968         if ($config{cgiurl} && exists $hooks{auth}) {
1969                 $template->param(prefsurl => cgiurl(do => "prefs"));
1970                 $have_actions=1;
1971         }
1972
1973         if ($have_actions || @actions) {
1974                 $template->param(have_actions => 1);
1975         }
1976 }
1977
1978 sub hook (@) {
1979         my %param=@_;
1980         
1981         if (! exists $param{type} || ! ref $param{call} || ! exists $param{id}) {
1982                 error 'hook requires type, call, and id parameters';
1983         }
1984
1985         return if $param{no_override} && exists $hooks{$param{type}}{$param{id}};
1986         
1987         $hooks{$param{type}}{$param{id}}=\%param;
1988         return 1;
1989 }
1990
1991 sub run_hooks ($$) {
1992         # Calls the given sub for each hook of the given type,
1993         # passing it the hook function to call.
1994         my $type=shift;
1995         my $sub=shift;
1996
1997         if (exists $hooks{$type}) {
1998                 my (@first, @middle, @last);
1999                 foreach my $id (keys %{$hooks{$type}}) {
2000                         if ($hooks{$type}{$id}{first}) {
2001                                 push @first, $id;
2002                         }
2003                         elsif ($hooks{$type}{$id}{last}) {
2004                                 push @last, $id;
2005                         }
2006                         else {
2007                                 push @middle, $id;
2008                         }
2009                 }
2010                 foreach my $id (@first, @middle, @last) {
2011                         $sub->($hooks{$type}{$id}{call});
2012                 }
2013         }
2014
2015         return 1;
2016 }
2017
2018 sub rcs_update () {
2019         $hooks{rcs}{rcs_update}{call}->(@_);
2020 }
2021
2022 sub rcs_prepedit ($) {
2023         $hooks{rcs}{rcs_prepedit}{call}->(@_);
2024 }
2025
2026 sub rcs_commit (@) {
2027         $hooks{rcs}{rcs_commit}{call}->(@_);
2028 }
2029
2030 sub rcs_commit_staged (@) {
2031         $hooks{rcs}{rcs_commit_staged}{call}->(@_);
2032 }
2033
2034 sub rcs_add ($) {
2035         $hooks{rcs}{rcs_add}{call}->(@_);
2036 }
2037
2038 sub rcs_remove ($) {
2039         $hooks{rcs}{rcs_remove}{call}->(@_);
2040 }
2041
2042 sub rcs_rename ($$) {
2043         $hooks{rcs}{rcs_rename}{call}->(@_);
2044 }
2045
2046 sub rcs_recentchanges ($) {
2047         $hooks{rcs}{rcs_recentchanges}{call}->(@_);
2048 }
2049
2050 sub rcs_diff ($;$) {
2051         $hooks{rcs}{rcs_diff}{call}->(@_);
2052 }
2053
2054 sub rcs_getctime ($) {
2055         $hooks{rcs}{rcs_getctime}{call}->(@_);
2056 }
2057
2058 sub rcs_getmtime ($) {
2059         $hooks{rcs}{rcs_getmtime}{call}->(@_);
2060 }
2061
2062 sub rcs_receive () {
2063         $hooks{rcs}{rcs_receive}{call}->();
2064 }
2065
2066 sub add_depends ($$;$) {
2067         my $page=shift;
2068         my $pagespec=shift;
2069         my $deptype=shift || $DEPEND_CONTENT;
2070
2071         # Is the pagespec a simple page name?
2072         if ($pagespec =~ /$config{wiki_file_regexp}/ &&
2073             $pagespec !~ /[\s*?()!]/) {
2074                 $depends_simple{$page}{lc $pagespec} |= $deptype;
2075                 return 1;
2076         }
2077
2078         # Add explicit dependencies for influences.
2079         my $sub=pagespec_translate($pagespec);
2080         return unless defined $sub;
2081         foreach my $p (keys %pagesources) {
2082                 my $r=$sub->($p, location => $page);
2083                 my $i=$r->influences;
2084                 my $static=$r->influences_static;
2085                 foreach my $k (keys %$i) {
2086                         next unless $r || $static || $k eq $page;
2087                         $depends_simple{$page}{lc $k} |= $i->{$k};
2088                 }
2089                 last if $static;
2090         }
2091
2092         $depends{$page}{$pagespec} |= $deptype;
2093         return 1;
2094 }
2095
2096 sub deptype (@) {
2097         my $deptype=0;
2098         foreach my $type (@_) {
2099                 if ($type eq 'presence') {
2100                         $deptype |= $DEPEND_PRESENCE;
2101                 }
2102                 elsif ($type eq 'links') { 
2103                         $deptype |= $DEPEND_LINKS;
2104                 }
2105                 elsif ($type eq 'content') {
2106                         $deptype |= $DEPEND_CONTENT;
2107                 }
2108         }
2109         return $deptype;
2110 }
2111
2112 my $file_prune_regexp;
2113 sub file_pruned ($) {
2114         my $file=shift;
2115
2116         if (defined $config{include} && length $config{include}) {
2117                 return 0 if $file =~ m/$config{include}/;
2118         }
2119
2120         if (! defined $file_prune_regexp) {
2121                 $file_prune_regexp='('.join('|', @{$config{wiki_file_prune_regexps}}).')';
2122                 $file_prune_regexp=qr/$file_prune_regexp/;
2123         }
2124         return $file =~ m/$file_prune_regexp/;
2125 }
2126
2127 sub define_gettext () {
2128         # If translation is needed, redefine the gettext function to do it.
2129         # Otherwise, it becomes a quick no-op.
2130         my $gettext_obj;
2131         my $getobj;
2132         if ((exists $ENV{LANG} && length $ENV{LANG}) ||
2133             (exists $ENV{LC_ALL} && length $ENV{LC_ALL}) ||
2134             (exists $ENV{LC_MESSAGES} && length $ENV{LC_MESSAGES})) {
2135                 $getobj=sub {
2136                         $gettext_obj=eval q{
2137                                 use Locale::gettext q{textdomain};
2138                                 Locale::gettext->domain('ikiwiki')
2139                         };
2140                 };
2141         }
2142
2143         no warnings 'redefine';
2144         *gettext=sub {
2145                 $getobj->() if $getobj;
2146                 if ($gettext_obj) {
2147                         $gettext_obj->get(shift);
2148                 }
2149                 else {
2150                         return shift;
2151                 }
2152         };
2153         *ngettext=sub {
2154                 $getobj->() if $getobj;
2155                 if ($gettext_obj) {
2156                         $gettext_obj->nget(@_);
2157                 }
2158                 else {
2159                         return ($_[2] == 1 ? $_[0] : $_[1])
2160                 }
2161         };
2162 }
2163
2164 sub gettext {
2165         define_gettext();
2166         gettext(@_);
2167 }
2168
2169 sub ngettext {
2170         define_gettext();
2171         ngettext(@_);
2172 }
2173
2174 sub yesno ($) {
2175         my $val=shift;
2176
2177         return (defined $val && (lc($val) eq gettext("yes") || lc($val) eq "yes" || $val eq "1"));
2178 }
2179
2180 sub inject {
2181         # Injects a new function into the symbol table to replace an
2182         # exported function.
2183         my %params=@_;
2184
2185         # This is deep ugly perl foo, beware.
2186         no strict;
2187         no warnings;
2188         if (! defined $params{parent}) {
2189                 $params{parent}='::';
2190                 $params{old}=\&{$params{name}};
2191                 $params{name}=~s/.*:://;
2192         }
2193         my $parent=$params{parent};
2194         foreach my $ns (grep /^\w+::/, keys %{$parent}) {
2195                 $ns = $params{parent} . $ns;
2196                 inject(%params, parent => $ns) unless $ns eq '::main::';
2197                 *{$ns . $params{name}} = $params{call}
2198                         if exists ${$ns}{$params{name}} &&
2199                            \&{${$ns}{$params{name}}} == $params{old};
2200         }
2201         use strict;
2202         use warnings;
2203 }
2204
2205 sub add_link ($$;$) {
2206         my $page=shift;
2207         my $link=shift;
2208         my $type=shift;
2209
2210         push @{$links{$page}}, $link
2211                 unless grep { $_ eq $link } @{$links{$page}};
2212
2213         if (defined $type) {
2214                 $typedlinks{$page}{$type}{$link} = 1;
2215         }
2216 }
2217
2218 sub add_autofile ($$$) {
2219         my $file=shift;
2220         my $plugin=shift;
2221         my $generator=shift;
2222         
2223         $autofiles{$file}{plugin}=$plugin;
2224         $autofiles{$file}{generator}=$generator;
2225 }
2226
2227 sub sortspec_translate ($$) {
2228         my $spec = shift;
2229         my $reverse = shift;
2230
2231         my $code = "";
2232         my @data;
2233         while ($spec =~ m{
2234                 \s*
2235                 (-?)            # group 1: perhaps negated
2236                 \s*
2237                 (               # group 2: a word
2238                         \w+\([^\)]*\)   # command(params)
2239                         |
2240                         [^\s]+          # or anything else
2241                 )
2242                 \s*
2243         }gx) {
2244                 my $negated = $1;
2245                 my $word = $2;
2246                 my $params = undef;
2247
2248                 if ($word =~ m/^(\w+)\((.*)\)$/) {
2249                         # command with parameters
2250                         $params = $2;
2251                         $word = $1;
2252                 }
2253                 elsif ($word !~ m/^\w+$/) {
2254                         error(sprintf(gettext("invalid sort type %s"), $word));
2255                 }
2256
2257                 if (length $code) {
2258                         $code .= " || ";
2259                 }
2260
2261                 if ($negated) {
2262                         $code .= "-";
2263                 }
2264
2265                 if (exists $IkiWiki::SortSpec::{"cmp_$word"}) {
2266                         if (defined $params) {
2267                                 push @data, $params;
2268                                 $code .= "IkiWiki::SortSpec::cmp_$word(\$data[$#data])";
2269                         }
2270                         else {
2271                                 $code .= "IkiWiki::SortSpec::cmp_$word(undef)";
2272                         }
2273                 }
2274                 else {
2275                         error(sprintf(gettext("unknown sort type %s"), $word));
2276                 }
2277         }
2278
2279         if (! length $code) {
2280                 # undefined sorting method... sort arbitrarily
2281                 return sub { 0 };
2282         }
2283
2284         if ($reverse) {
2285                 $code="-($code)";
2286         }
2287
2288         no warnings;
2289         return eval 'sub { '.$code.' }';
2290 }
2291
2292 sub pagespec_translate ($) {
2293         my $spec=shift;
2294
2295         # Convert spec to perl code.
2296         my $code="";
2297         my @data;
2298         while ($spec=~m{
2299                 \s*             # ignore whitespace
2300                 (               # 1: match a single word
2301                         \!              # !
2302                 |
2303                         \(              # (
2304                 |
2305                         \)              # )
2306                 |
2307                         \w+\([^\)]*\)   # command(params)
2308                 |
2309                         [^\s()]+        # any other text
2310                 )
2311                 \s*             # ignore whitespace
2312         }gx) {
2313                 my $word=$1;
2314                 if (lc $word eq 'and') {
2315                         $code.=' &';
2316                 }
2317                 elsif (lc $word eq 'or') {
2318                         $code.=' |';
2319                 }
2320                 elsif ($word eq "(" || $word eq ")" || $word eq "!") {
2321                         $code.=' '.$word;
2322                 }
2323                 elsif ($word =~ /^(\w+)\((.*)\)$/) {
2324                         if (exists $IkiWiki::PageSpec::{"match_$1"}) {
2325                                 push @data, $2;
2326                                 $code.="IkiWiki::PageSpec::match_$1(\$page, \$data[$#data], \@_)";
2327                         }
2328                         else {
2329                                 push @data, qq{unknown function in pagespec "$word"};
2330                                 $code.="IkiWiki::ErrorReason->new(\$data[$#data])";
2331                         }
2332                 }
2333                 else {
2334                         push @data, $word;
2335                         $code.=" IkiWiki::PageSpec::match_glob(\$page, \$data[$#data], \@_)";
2336                 }
2337         }
2338
2339         if (! length $code) {
2340                 $code="IkiWiki::FailReason->new('empty pagespec')";
2341         }
2342
2343         no warnings;
2344         return eval 'sub { my $page=shift; '.$code.' }';
2345 }
2346
2347 sub pagespec_match ($$;@) {
2348         my $page=shift;
2349         my $spec=shift;
2350         my @params=@_;
2351
2352         # Backwards compatability with old calling convention.
2353         if (@params == 1) {
2354                 unshift @params, 'location';
2355         }
2356
2357         my $sub=pagespec_translate($spec);
2358         return IkiWiki::ErrorReason->new("syntax error in pagespec \"$spec\"")
2359                 if ! defined $sub;
2360         return $sub->($page, @params);
2361 }
2362
2363 sub pagespec_match_list ($$;@) {
2364         my $page=shift;
2365         my $pagespec=shift;
2366         my %params=@_;
2367
2368         # Backwards compatability with old calling convention.
2369         if (ref $page) {
2370                 print STDERR "warning: a plugin (".caller().") is using pagespec_match_list in an obsolete way, and needs to be updated\n";
2371                 $params{list}=$page;
2372                 $page=$params{location}; # ugh!
2373         }
2374
2375         my $sub=pagespec_translate($pagespec);
2376         error "syntax error in pagespec \"$pagespec\""
2377                 if ! defined $sub;
2378         my $sort=sortspec_translate($params{sort}, $params{reverse})
2379                 if defined $params{sort};
2380
2381         my @candidates;
2382         if (exists $params{list}) {
2383                 @candidates=exists $params{filter}
2384                         ? grep { ! $params{filter}->($_) } @{$params{list}}
2385                         : @{$params{list}};
2386         }
2387         else {
2388                 @candidates=exists $params{filter}
2389                         ? grep { ! $params{filter}->($_) } keys %pagesources
2390                         : keys %pagesources;
2391         }
2392         
2393         # clear params, remainder is passed to pagespec
2394         $depends{$page}{$pagespec} |= ($params{deptype} || $DEPEND_CONTENT);
2395         my $num=$params{num};
2396         delete @params{qw{num deptype reverse sort filter list}};
2397         
2398         # when only the top matches will be returned, it's efficient to
2399         # sort before matching to pagespec,
2400         if (defined $num && defined $sort) {
2401                 @candidates=IkiWiki::SortSpec::sort_pages(
2402                         $sort, @candidates);
2403         }
2404         
2405         my @matches;
2406         my $firstfail;
2407         my $count=0;
2408         my $accum=IkiWiki::SuccessReason->new();
2409         foreach my $p (@candidates) {
2410                 my $r=$sub->($p, %params, location => $page);
2411                 error(sprintf(gettext("cannot match pages: %s"), $r))
2412                         if $r->isa("IkiWiki::ErrorReason");
2413                 unless ($r || $r->influences_static) {
2414                         $r->remove_influence($p);
2415                 }
2416                 $accum |= $r;
2417                 if ($r) {
2418                         push @matches, $p;
2419                         last if defined $num && ++$count == $num;
2420                 }
2421         }
2422
2423         # Add simple dependencies for accumulated influences.
2424         my $i=$accum->influences;
2425         foreach my $k (keys %$i) {
2426                 $depends_simple{$page}{lc $k} |= $i->{$k};
2427         }
2428
2429         # when all matches will be returned, it's efficient to
2430         # sort after matching
2431         if (! defined $num && defined $sort) {
2432                 return IkiWiki::SortSpec::sort_pages(
2433                         $sort, @matches);
2434         }
2435         else {
2436                 return @matches;
2437         }
2438 }
2439
2440 sub pagespec_valid ($) {
2441         my $spec=shift;
2442
2443         return defined pagespec_translate($spec);
2444 }
2445
2446 sub glob2re ($) {
2447         my $re=quotemeta(shift);
2448         $re=~s/\\\*/.*/g;
2449         $re=~s/\\\?/./g;
2450         return qr/^$re$/i;
2451 }
2452
2453 package IkiWiki::FailReason;
2454
2455 use overload (
2456         '""'    => sub { $_[0][0] },
2457         '0+'    => sub { 0 },
2458         '!'     => sub { bless $_[0], 'IkiWiki::SuccessReason'},
2459         '&'     => sub { $_[0]->merge_influences($_[1], 1); $_[0] },
2460         '|'     => sub { $_[1]->merge_influences($_[0]); $_[1] },
2461         fallback => 1,
2462 );
2463
2464 our @ISA = 'IkiWiki::SuccessReason';
2465
2466 package IkiWiki::SuccessReason;
2467
2468 use overload (
2469         '""'    => sub { $_[0][0] },
2470         '0+'    => sub { 1 },
2471         '!'     => sub { bless $_[0], 'IkiWiki::FailReason'},
2472         '&'     => sub { $_[1]->merge_influences($_[0], 1); $_[1] },
2473         '|'     => sub { $_[0]->merge_influences($_[1]); $_[0] },
2474         fallback => 1,
2475 );
2476
2477 sub new {
2478         my $class = shift;
2479         my $value = shift;
2480         return bless [$value, {@_}], $class;
2481 }
2482
2483 sub influences {
2484         my $this=shift;
2485         $this->[1]={@_} if @_;
2486         my %i=%{$this->[1]};
2487         delete $i{""};
2488         return \%i;
2489 }
2490
2491 sub influences_static {
2492         return ! $_[0][1]->{""};
2493 }
2494
2495 sub merge_influences {
2496         my $this=shift;
2497         my $other=shift;
2498         my $anded=shift;
2499
2500         if (! $anded || (($this || %{$this->[1]}) &&
2501                          ($other || %{$other->[1]}))) {
2502                 foreach my $influence (keys %{$other->[1]}) {
2503                         $this->[1]{$influence} |= $other->[1]{$influence};
2504                 }
2505         }
2506         else {
2507                 # influence blocker
2508                 $this->[1]={};
2509         }
2510 }
2511
2512 sub remove_influence {
2513         my $this=shift;
2514         my $torm=shift;
2515
2516         delete $this->[1]{$torm};
2517 }
2518
2519 package IkiWiki::ErrorReason;
2520
2521 our @ISA = 'IkiWiki::FailReason';
2522
2523 package IkiWiki::PageSpec;
2524
2525 sub derel ($$) {
2526         my $path=shift;
2527         my $from=shift;
2528
2529         if ($path =~ m!^\.(/|$)!) {
2530                 if ($1) {
2531                         $from=~s#/?[^/]+$## if defined $from;
2532                         $path=~s#^\./##;
2533                         $path="$from/$path" if defined $from && length $from;
2534                 }
2535                 else {
2536                         $path = $from;
2537                         $path = "" unless defined $path;
2538                 }
2539         }
2540
2541         return $path;
2542 }
2543
2544 my %glob_cache;
2545
2546 sub match_glob ($$;@) {
2547         my $page=shift;
2548         my $glob=shift;
2549         my %params=@_;
2550         
2551         $glob=derel($glob, $params{location});
2552
2553         # Instead of converting the glob to a regex every time,
2554         # cache the compiled regex to save time.
2555         my $re=$glob_cache{$glob};
2556         unless (defined $re) {
2557                 $glob_cache{$glob} = $re = IkiWiki::glob2re($glob);
2558         }
2559         if ($page =~ $re) {
2560                 if (! IkiWiki::isinternal($page) || $params{internal}) {
2561                         return IkiWiki::SuccessReason->new("$glob matches $page");
2562                 }
2563                 else {
2564                         return IkiWiki::FailReason->new("$glob matches $page, but the page is an internal page");
2565                 }
2566         }
2567         else {
2568                 return IkiWiki::FailReason->new("$glob does not match $page");
2569         }
2570 }
2571
2572 sub match_internal ($$;@) {
2573         return match_glob(shift, shift, @_, internal => 1)
2574 }
2575
2576 sub match_page ($$;@) {
2577         my $page=shift;
2578         my $match=match_glob($page, shift, @_);
2579         if ($match) {
2580                 my $source=exists $IkiWiki::pagesources{$page} ?
2581                         $IkiWiki::pagesources{$page} :
2582                         $IkiWiki::delpagesources{$page};
2583                 my $type=defined $source ? IkiWiki::pagetype($source) : undef;
2584                 if (! defined $type) {  
2585                         return IkiWiki::FailReason->new("$page is not a page");
2586                 }
2587         }
2588         return $match;
2589 }
2590
2591 sub match_link ($$;@) {
2592         my $page=shift;
2593         my $link=lc(shift);
2594         my %params=@_;
2595
2596         $link=derel($link, $params{location});
2597         my $from=exists $params{location} ? $params{location} : '';
2598         my $linktype=$params{linktype};
2599         my $qualifier='';
2600         if (defined $linktype) {
2601                 $qualifier=" with type $linktype";
2602         }
2603
2604         my $links = $IkiWiki::links{$page};
2605         return IkiWiki::FailReason->new("$page has no links", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2606                 unless $links && @{$links};
2607         my $bestlink = IkiWiki::bestlink($from, $link);
2608         foreach my $p (@{$links}) {
2609                 next unless (! defined $linktype || exists $IkiWiki::typedlinks{$page}{$linktype}{$p});
2610
2611                 if (length $bestlink) {
2612                         if ($bestlink eq IkiWiki::bestlink($page, $p)) {
2613                                 return IkiWiki::SuccessReason->new("$page links to $link$qualifier", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2614                         }
2615                 }
2616                 else {
2617                         if (match_glob($p, $link, %params)) {
2618                                 return IkiWiki::SuccessReason->new("$page links to page $p$qualifier, matching $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2619                         }
2620                         my ($p_rel)=$p=~/^\/?(.*)/;
2621                         $link=~s/^\///;
2622                         if (match_glob($p_rel, $link, %params)) {
2623                                 return IkiWiki::SuccessReason->new("$page links to page $p_rel$qualifier, matching $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2624                         }
2625                 }
2626         }
2627         return IkiWiki::FailReason->new("$page does not link to $link$qualifier", $page => $IkiWiki::DEPEND_LINKS, "" => 1);
2628 }
2629
2630 sub match_backlink ($$;@) {
2631         my $ret=match_link($_[1], $_[0], @_);
2632         $ret->influences($_[1] => $IkiWiki::DEPEND_LINKS);
2633         return $ret;
2634 }
2635
2636 sub match_created_before ($$;@) {
2637         my $page=shift;
2638         my $testpage=shift;
2639         my %params=@_;
2640         
2641         $testpage=derel($testpage, $params{location});
2642
2643         if (exists $IkiWiki::pagectime{$testpage}) {
2644                 if ($IkiWiki::pagectime{$page} < $IkiWiki::pagectime{$testpage}) {
2645                         return IkiWiki::SuccessReason->new("$page created before $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2646                 }
2647                 else {
2648                         return IkiWiki::FailReason->new("$page not created before $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2649                 }
2650         }
2651         else {
2652                 return IkiWiki::ErrorReason->new("$testpage does not exist", $testpage => $IkiWiki::DEPEND_PRESENCE);
2653         }
2654 }
2655
2656 sub match_created_after ($$;@) {
2657         my $page=shift;
2658         my $testpage=shift;
2659         my %params=@_;
2660         
2661         $testpage=derel($testpage, $params{location});
2662
2663         if (exists $IkiWiki::pagectime{$testpage}) {
2664                 if ($IkiWiki::pagectime{$page} > $IkiWiki::pagectime{$testpage}) {
2665                         return IkiWiki::SuccessReason->new("$page created after $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2666                 }
2667                 else {
2668                         return IkiWiki::FailReason->new("$page not created after $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2669                 }
2670         }
2671         else {
2672                 return IkiWiki::ErrorReason->new("$testpage does not exist", $testpage => $IkiWiki::DEPEND_PRESENCE);
2673         }
2674 }
2675
2676 sub match_creation_day ($$;@) {
2677         my $page=shift;
2678         my $d=shift;
2679         if ($d !~ /^\d+$/) {
2680                 return IkiWiki::ErrorReason->new("invalid day $d");
2681         }
2682         if ((localtime($IkiWiki::pagectime{$page}))[3] == $d) {
2683                 return IkiWiki::SuccessReason->new('creation_day matched');
2684         }
2685         else {
2686                 return IkiWiki::FailReason->new('creation_day did not match');
2687         }
2688 }
2689
2690 sub match_creation_month ($$;@) {
2691         my $page=shift;
2692         my $m=shift;
2693         if ($m !~ /^\d+$/) {
2694                 return IkiWiki::ErrorReason->new("invalid month $m");
2695         }
2696         if ((localtime($IkiWiki::pagectime{$page}))[4] + 1 == $m) {
2697                 return IkiWiki::SuccessReason->new('creation_month matched');
2698         }
2699         else {
2700                 return IkiWiki::FailReason->new('creation_month did not match');
2701         }
2702 }
2703
2704 sub match_creation_year ($$;@) {
2705         my $page=shift;
2706         my $y=shift;
2707         if ($y !~ /^\d+$/) {
2708                 return IkiWiki::ErrorReason->new("invalid year $y");
2709         }
2710         if ((localtime($IkiWiki::pagectime{$page}))[5] + 1900 == $y) {
2711                 return IkiWiki::SuccessReason->new('creation_year matched');
2712         }
2713         else {
2714                 return IkiWiki::FailReason->new('creation_year did not match');
2715         }
2716 }
2717
2718 sub match_user ($$;@) {
2719         shift;
2720         my $user=shift;
2721         my %params=@_;
2722         
2723         my $regexp=IkiWiki::glob2re($user);
2724         
2725         if (! exists $params{user}) {
2726                 return IkiWiki::ErrorReason->new("no user specified");
2727         }
2728
2729         if (defined $params{user} && $params{user}=~$regexp) {
2730                 return IkiWiki::SuccessReason->new("user is $user");
2731         }
2732         elsif (! defined $params{user}) {
2733                 return IkiWiki::FailReason->new("not logged in");
2734         }
2735         else {
2736                 return IkiWiki::FailReason->new("user is $params{user}, not $user");
2737         }
2738 }
2739
2740 sub match_admin ($$;@) {
2741         shift;
2742         shift;
2743         my %params=@_;
2744         
2745         if (! exists $params{user}) {
2746                 return IkiWiki::ErrorReason->new("no user specified");
2747         }
2748
2749         if (defined $params{user} && IkiWiki::is_admin($params{user})) {
2750                 return IkiWiki::SuccessReason->new("user is an admin");
2751         }
2752         elsif (! defined $params{user}) {
2753                 return IkiWiki::FailReason->new("not logged in");
2754         }
2755         else {
2756                 return IkiWiki::FailReason->new("user is not an admin");
2757         }
2758 }
2759
2760 sub match_ip ($$;@) {
2761         shift;
2762         my $ip=shift;
2763         my %params=@_;
2764         
2765         if (! exists $params{ip}) {
2766                 return IkiWiki::ErrorReason->new("no IP specified");
2767         }
2768
2769         if (defined $params{ip} && lc $params{ip} eq lc $ip) {
2770                 return IkiWiki::SuccessReason->new("IP is $ip");
2771         }
2772         else {
2773                 return IkiWiki::FailReason->new("IP is $params{ip}, not $ip");
2774         }
2775 }
2776
2777 package IkiWiki::SortSpec;
2778
2779 # This is in the SortSpec namespace so that the $a and $b that sort() uses
2780 # are easily available in this namespace, for cmp functions to use them.
2781 sub sort_pages {
2782         my $f=shift;
2783         sort $f @_
2784 }
2785
2786 sub cmp_title {
2787         IkiWiki::pagetitle(IkiWiki::basename($a))
2788         cmp
2789         IkiWiki::pagetitle(IkiWiki::basename($b))
2790 }
2791
2792 sub cmp_mtime { $IkiWiki::pagemtime{$b} <=> $IkiWiki::pagemtime{$a} }
2793 sub cmp_age { $IkiWiki::pagectime{$b} <=> $IkiWiki::pagectime{$a} }
2794
2795 1