urlto: simplify the to='' special case to allow it to be made absolute
[ikiwiki] / IkiWiki.pm
1 #!/usr/bin/perl
2
3 package IkiWiki;
4
5 use warnings;
6 use strict;
7 use Encode;
8 use URI::Escape q{uri_escape_utf8};
9 use POSIX ();
10 use Storable;
11 use open qw{:utf8 :std};
12
13 use vars qw{%config %links %oldlinks %pagemtime %pagectime %pagecase
14         %pagestate %wikistate %renderedfiles %oldrenderedfiles
15         %pagesources %delpagesources %destsources %depends %depends_simple
16         @mass_depends %hooks %forcerebuild %loaded_plugins %typedlinks
17         %oldtypedlinks %autofiles};
18
19 use Exporter q{import};
20 our @EXPORT = qw(hook debug error htmlpage template template_depends
21         deptype add_depends pagespec_match pagespec_match_list bestlink
22         htmllink readfile writefile pagetype srcfile pagename
23         displaytime will_render gettext ngettext urlto targetpage
24         add_underlay pagetitle titlepage linkpage newpagefile
25         inject add_link add_autofile
26         %config %links %pagestate %wikistate %renderedfiles
27         %pagesources %destsources %typedlinks);
28 our $VERSION = 3.00; # plugin interface version, next is ikiwiki version
29 our $version='unknown'; # VERSION_AUTOREPLACE done by Makefile, DNE
30 our $installdir='/usr'; # INSTALLDIR_AUTOREPLACE done by Makefile, DNE
31
32 # Page dependency types.
33 our $DEPEND_CONTENT=1;
34 our $DEPEND_PRESENCE=2;
35 our $DEPEND_LINKS=4;
36
37 # Optimisation.
38 use Memoize;
39 memoize("abs2rel");
40 memoize("sortspec_translate");
41 memoize("pagespec_translate");
42 memoize("template_file");
43
44 sub getsetup () {
45         wikiname => {
46                 type => "string",
47                 default => "wiki",
48                 description => "name of the wiki",
49                 safe => 1,
50                 rebuild => 1,
51         },
52         adminemail => {
53                 type => "string",
54                 default => undef,
55                 example => 'me@example.com',
56                 description => "contact email for wiki",
57                 safe => 1,
58                 rebuild => 0,
59         },
60         adminuser => {
61                 type => "string",
62                 default => [],
63                 description => "users who are wiki admins",
64                 safe => 1,
65                 rebuild => 0,
66         },
67         banned_users => {
68                 type => "string",
69                 default => [],
70                 description => "users who are banned from the wiki",
71                 safe => 1,
72                 rebuild => 0,
73         },
74         srcdir => {
75                 type => "string",
76                 default => undef,
77                 example => "$ENV{HOME}/wiki",
78                 description => "where the source of the wiki is located",
79                 safe => 0, # path
80                 rebuild => 1,
81         },
82         destdir => {
83                 type => "string",
84                 default => undef,
85                 example => "/var/www/wiki",
86                 description => "where to build the wiki",
87                 safe => 0, # path
88                 rebuild => 1,
89         },
90         url => {
91                 type => "string",
92                 default => '',
93                 example => "http://example.com/wiki",
94                 description => "base url to the wiki",
95                 safe => 1,
96                 rebuild => 1,
97         },
98         cgiurl => {
99                 type => "string",
100                 default => '',
101                 example => "http://example.com/wiki/ikiwiki.cgi",
102                 description => "url to the ikiwiki.cgi",
103                 safe => 1,
104                 rebuild => 1,
105         },
106         cgi_wrapper => {
107                 type => "string",
108                 default => '',
109                 example => "/var/www/wiki/ikiwiki.cgi",
110                 description => "filename of cgi wrapper to generate",
111                 safe => 0, # file
112                 rebuild => 0,
113         },
114         cgi_wrappermode => {
115                 type => "string",
116                 default => '06755',
117                 description => "mode for cgi_wrapper (can safely be made suid)",
118                 safe => 0,
119                 rebuild => 0,
120         },
121         rcs => {
122                 type => "string",
123                 default => '',
124                 description => "rcs backend to use",
125                 safe => 0, # don't allow overriding
126                 rebuild => 0,
127         },
128         default_plugins => {
129                 type => "internal",
130                 default => [qw{mdwn link inline meta htmlscrubber passwordauth
131                                 openid signinedit lockedit conditional
132                                 recentchanges parentlinks editpage}],
133                 description => "plugins to enable by default",
134                 safe => 0,
135                 rebuild => 1,
136         },
137         add_plugins => {
138                 type => "string",
139                 default => [],
140                 description => "plugins to add to the default configuration",
141                 safe => 1,
142                 rebuild => 1,
143         },
144         disable_plugins => {
145                 type => "string",
146                 default => [],
147                 description => "plugins to disable",
148                 safe => 1,
149                 rebuild => 1,
150         },
151         templatedir => {
152                 type => "string",
153                 default => "$installdir/share/ikiwiki/templates",
154                 description => "additional directory to search for template files",
155                 advanced => 1,
156                 safe => 0, # path
157                 rebuild => 1,
158         },
159         underlaydir => {
160                 type => "string",
161                 default => "$installdir/share/ikiwiki/basewiki",
162                 description => "base wiki source location",
163                 advanced => 1,
164                 safe => 0, # path
165                 rebuild => 0,
166         },
167         underlaydirbase => {
168                 type => "internal",
169                 default => "$installdir/share/ikiwiki",
170                 description => "parent directory containing additional underlays",
171                 safe => 0,
172                 rebuild => 0,
173         },
174         wrappers => {
175                 type => "internal",
176                 default => [],
177                 description => "wrappers to generate",
178                 safe => 0,
179                 rebuild => 0,
180         },
181         underlaydirs => {
182                 type => "internal",
183                 default => [],
184                 description => "additional underlays to use",
185                 safe => 0,
186                 rebuild => 0,
187         },
188         verbose => {
189                 type => "boolean",
190                 example => 1,
191                 description => "display verbose messages?",
192                 safe => 1,
193                 rebuild => 0,
194         },
195         syslog => {
196                 type => "boolean",
197                 example => 1,
198                 description => "log to syslog?",
199                 safe => 1,
200                 rebuild => 0,
201         },
202         usedirs => {
203                 type => "boolean",
204                 default => 1,
205                 description => "create output files named page/index.html?",
206                 safe => 0, # changing requires manual transition
207                 rebuild => 1,
208         },
209         prefix_directives => {
210                 type => "boolean",
211                 default => 1,
212                 description => "use '!'-prefixed preprocessor directives?",
213                 safe => 0, # changing requires manual transition
214                 rebuild => 1,
215         },
216         indexpages => {
217                 type => "boolean",
218                 default => 0,
219                 description => "use page/index.mdwn source files",
220                 safe => 1,
221                 rebuild => 1,
222         },
223         discussion => {
224                 type => "boolean",
225                 default => 1,
226                 description => "enable Discussion pages?",
227                 safe => 1,
228                 rebuild => 1,
229         },
230         discussionpage => {
231                 type => "string",
232                 default => gettext("Discussion"),
233                 description => "name of Discussion pages",
234                 safe => 1,
235                 rebuild => 1,
236         },
237         html5 => {
238                 type => "boolean",
239                 default => 0,
240                 description => "generate HTML5? (experimental)",
241                 advanced => 1,
242                 safe => 1,
243                 rebuild => 1,
244         },
245         sslcookie => {
246                 type => "boolean",
247                 default => 0,
248                 description => "only send cookies over SSL connections?",
249                 advanced => 1,
250                 safe => 1,
251                 rebuild => 0,
252         },
253         default_pageext => {
254                 type => "string",
255                 default => "mdwn",
256                 description => "extension to use for new pages",
257                 safe => 0, # not sanitized
258                 rebuild => 0,
259         },
260         htmlext => {
261                 type => "string",
262                 default => "html",
263                 description => "extension to use for html files",
264                 safe => 0, # not sanitized
265                 rebuild => 1,
266         },
267         timeformat => {
268                 type => "string",
269                 default => '%c',
270                 description => "strftime format string to display date",
271                 advanced => 1,
272                 safe => 1,
273                 rebuild => 1,
274         },
275         locale => {
276                 type => "string",
277                 default => undef,
278                 example => "en_US.UTF-8",
279                 description => "UTF-8 locale to use",
280                 advanced => 1,
281                 safe => 0,
282                 rebuild => 1,
283         },
284         userdir => {
285                 type => "string",
286                 default => "",
287                 example => "users",
288                 description => "put user pages below specified page",
289                 safe => 1,
290                 rebuild => 1,
291         },
292         numbacklinks => {
293                 type => "integer",
294                 default => 10,
295                 description => "how many backlinks to show before hiding excess (0 to show all)",
296                 safe => 1,
297                 rebuild => 1,
298         },
299         hardlink => {
300                 type => "boolean",
301                 default => 0,
302                 description => "attempt to hardlink source files? (optimisation for large files)",
303                 advanced => 1,
304                 safe => 0, # paranoia
305                 rebuild => 0,
306         },
307         umask => {
308                 type => "integer",
309                 example => "022",
310                 description => "force ikiwiki to use a particular umask",
311                 advanced => 1,
312                 safe => 0, # paranoia
313                 rebuild => 0,
314         },
315         wrappergroup => {
316                 type => "string",
317                 example => "ikiwiki",
318                 description => "group for wrappers to run in",
319                 advanced => 1,
320                 safe => 0, # paranoia
321                 rebuild => 0,
322         },
323         libdir => {
324                 type => "string",
325                 default => "",
326                 example => "$ENV{HOME}/.ikiwiki/",
327                 description => "extra library and plugin directory",
328                 advanced => 1,
329                 safe => 0, # directory
330                 rebuild => 0,
331         },
332         ENV => {
333                 type => "string", 
334                 default => {},
335                 description => "environment variables",
336                 safe => 0, # paranoia
337                 rebuild => 0,
338         },
339         include => {
340                 type => "string",
341                 default => undef,
342                 example => '^\.htaccess$',
343                 description => "regexp of normally excluded files to include",
344                 advanced => 1,
345                 safe => 0, # regexp
346                 rebuild => 1,
347         },
348         exclude => {
349                 type => "string",
350                 default => undef,
351                 example => '^(*\.private|Makefile)$',
352                 description => "regexp of files that should be skipped",
353                 advanced => 1,
354                 safe => 0, # regexp
355                 rebuild => 1,
356         },
357         wiki_file_prune_regexps => {
358                 type => "internal",
359                 default => [qr/(^|\/)\.\.(\/|$)/, qr/^\//, qr/^\./, qr/\/\./,
360                         qr/\.x?html?$/, qr/\.ikiwiki-new$/,
361                         qr/(^|\/).svn\//, qr/.arch-ids\//, qr/{arch}\//,
362                         qr/(^|\/)_MTN\//, qr/(^|\/)_darcs\//,
363                         qr/(^|\/)CVS\//, qr/\.dpkg-tmp$/],
364                 description => "regexps of source files to ignore",
365                 safe => 0,
366                 rebuild => 1,
367         },
368         wiki_file_chars => {
369                 type => "string",
370                 description => "specifies the characters that are allowed in source filenames",
371                 default => "-[:alnum:]+/.:_",
372                 safe => 0,
373                 rebuild => 1,
374         },
375         wiki_file_regexp => {
376                 type => "internal",
377                 description => "regexp of legal source files",
378                 safe => 0,
379                 rebuild => 1,
380         },
381         web_commit_regexp => {
382                 type => "internal",
383                 default => qr/^web commit (by (.*?(?=: |$))|from ([0-9a-fA-F:.]+[0-9a-fA-F])):?(.*)/,
384                 description => "regexp to parse web commits from logs",
385                 safe => 0,
386                 rebuild => 0,
387         },
388         cgi => {
389                 type => "internal",
390                 default => 0,
391                 description => "run as a cgi",
392                 safe => 0,
393                 rebuild => 0,
394         },
395         cgi_disable_uploads => {
396                 type => "internal",
397                 default => 1,
398                 description => "whether CGI should accept file uploads",
399                 safe => 0,
400                 rebuild => 0,
401         },
402         post_commit => {
403                 type => "internal",
404                 default => 0,
405                 description => "run as a post-commit hook",
406                 safe => 0,
407                 rebuild => 0,
408         },
409         rebuild => {
410                 type => "internal",
411                 default => 0,
412                 description => "running in rebuild mode",
413                 safe => 0,
414                 rebuild => 0,
415         },
416         setup => {
417                 type => "internal",
418                 default => undef,
419                 description => "running in setup mode",
420                 safe => 0,
421                 rebuild => 0,
422         },
423         clean => {
424                 type => "internal",
425                 default => 0,
426                 description => "running in clean mode",
427                 safe => 0,
428                 rebuild => 0,
429         },
430         refresh => {
431                 type => "internal",
432                 default => 0,
433                 description => "running in refresh mode",
434                 safe => 0,
435                 rebuild => 0,
436         },
437         test_receive => {
438                 type => "internal",
439                 default => 0,
440                 description => "running in receive test mode",
441                 safe => 0,
442                 rebuild => 0,
443         },
444         wrapper_background_command => {
445                 type => "internal",
446                 default => '',
447                 description => "background shell command to run",
448                 safe => 0,
449                 rebuild => 0,
450         },
451         gettime => {
452                 type => "internal",
453                 description => "running in gettime mode",
454                 safe => 0,
455                 rebuild => 0,
456         },
457         w3mmode => {
458                 type => "internal",
459                 default => 0,
460                 description => "running in w3mmode",
461                 safe => 0,
462                 rebuild => 0,
463         },
464         wikistatedir => {
465                 type => "internal",
466                 default => undef,
467                 description => "path to the .ikiwiki directory holding ikiwiki state",
468                 safe => 0,
469                 rebuild => 0,
470         },
471         setupfile => {
472                 type => "internal",
473                 default => undef,
474                 description => "path to setup file",
475                 safe => 0,
476                 rebuild => 0,
477         },
478         setuptype => {
479                 type => "internal",
480                 default => "Standard",
481                 description => "perl class to use to dump setup file",
482                 safe => 0,
483                 rebuild => 0,
484         },
485         allow_symlinks_before_srcdir => {
486                 type => "boolean",
487                 default => 0,
488                 description => "allow symlinks in the path leading to the srcdir (potentially insecure)",
489                 safe => 0,
490                 rebuild => 0,
491         },
492 }
493
494 sub defaultconfig () {
495         my %s=getsetup();
496         my @ret;
497         foreach my $key (keys %s) {
498                 push @ret, $key, $s{$key}->{default};
499         }
500         use Data::Dumper;
501         return @ret;
502 }
503
504 # URL to top of wiki as a path starting with /, valid from any wiki page or
505 # the CGI; if that's not possible, an absolute URL. Either way, it ends with /
506 my $local_url;
507 # URL to CGI script, similar to $local_url
508 my $local_cgiurl;
509
510 sub checkconfig () {
511         # locale stuff; avoid LC_ALL since it overrides everything
512         if (defined $ENV{LC_ALL}) {
513                 $ENV{LANG} = $ENV{LC_ALL};
514                 delete $ENV{LC_ALL};
515         }
516         if (defined $config{locale}) {
517                 if (POSIX::setlocale(&POSIX::LC_ALL, $config{locale})) {
518                         $ENV{LANG}=$config{locale};
519                         define_gettext();
520                 }
521         }
522                 
523         if (! defined $config{wiki_file_regexp}) {
524                 $config{wiki_file_regexp}=qr/(^[$config{wiki_file_chars}]+$)/;
525         }
526
527         if (ref $config{ENV} eq 'HASH') {
528                 foreach my $val (keys %{$config{ENV}}) {
529                         $ENV{$val}=$config{ENV}{$val};
530                 }
531         }
532
533         if ($config{w3mmode}) {
534                 eval q{use Cwd q{abs_path}};
535                 error($@) if $@;
536                 $config{srcdir}=possibly_foolish_untaint(abs_path($config{srcdir}));
537                 $config{destdir}=possibly_foolish_untaint(abs_path($config{destdir}));
538                 $config{cgiurl}="file:///\$LIB/ikiwiki-w3m.cgi/".$config{cgiurl}
539                         unless $config{cgiurl} =~ m!file:///!;
540                 $config{url}="file://".$config{destdir};
541         }
542
543         if ($config{cgi} && ! length $config{url}) {
544                 error(gettext("Must specify url to wiki with --url when using --cgi"));
545         }
546
547         if (defined $config{url} && length $config{url}) {
548                 eval q{use URI};
549                 my $baseurl = URI->new($config{url});
550
551                 $local_url = $baseurl->path . "/";
552                 $local_cgiurl = undef;
553
554                 if (length $config{cgiurl}) {
555                         my $cgiurl = URI->new($config{cgiurl});
556
557                         $local_cgiurl = $cgiurl->path;
558
559                         if ($cgiurl->scheme ne $baseurl->scheme or
560                                 $cgiurl->authority ne $baseurl->authority) {
561                                 # too far apart, fall back to absolute URLs
562                                 $local_url = "$config{url}/";
563                                 $local_cgiurl = $config{cgiurl};
564                         }
565                 }
566
567                 $local_url =~ s{//$}{/};
568         }
569         else {
570                 $local_cgiurl = $config{cgiurl};
571         }
572
573         $config{wikistatedir}="$config{srcdir}/.ikiwiki"
574                 unless exists $config{wikistatedir} && defined $config{wikistatedir};
575
576         if (defined $config{umask}) {
577                 umask(possibly_foolish_untaint($config{umask}));
578         }
579
580         run_hooks(checkconfig => sub { shift->() });
581
582         return 1;
583 }
584
585 sub listplugins () {
586         my %ret;
587
588         foreach my $dir (@INC, $config{libdir}) {
589                 next unless defined $dir && length $dir;
590                 foreach my $file (glob("$dir/IkiWiki/Plugin/*.pm")) {
591                         my ($plugin)=$file=~/.*\/(.*)\.pm$/;
592                         $ret{$plugin}=1;
593                 }
594         }
595         foreach my $dir ($config{libdir}, "$installdir/lib/ikiwiki") {
596                 next unless defined $dir && length $dir;
597                 foreach my $file (glob("$dir/plugins/*")) {
598                         $ret{basename($file)}=1 if -x $file;
599                 }
600         }
601
602         return keys %ret;
603 }
604
605 sub loadplugins () {
606         if (defined $config{libdir} && length $config{libdir}) {
607                 unshift @INC, possibly_foolish_untaint($config{libdir});
608         }
609
610         foreach my $plugin (@{$config{default_plugins}}, @{$config{add_plugins}}) {
611                 loadplugin($plugin);
612         }
613         
614         if ($config{rcs}) {
615                 if (exists $hooks{rcs}) {
616                         error(gettext("cannot use multiple rcs plugins"));
617                 }
618                 loadplugin($config{rcs});
619         }
620         if (! exists $hooks{rcs}) {
621                 loadplugin("norcs");
622         }
623
624         run_hooks(getopt => sub { shift->() });
625         if (grep /^-/, @ARGV) {
626                 print STDERR "Unknown option (or missing parameter): $_\n"
627                         foreach grep /^-/, @ARGV;
628                 usage();
629         }
630
631         return 1;
632 }
633
634 sub loadplugin ($;$) {
635         my $plugin=shift;
636         my $force=shift;
637
638         return if ! $force && grep { $_ eq $plugin} @{$config{disable_plugins}};
639
640         foreach my $dir (defined $config{libdir} ? possibly_foolish_untaint($config{libdir}) : undef,
641                          "$installdir/lib/ikiwiki") {
642                 if (defined $dir && -x "$dir/plugins/$plugin") {
643                         eval { require IkiWiki::Plugin::external };
644                         if ($@) {
645                                 my $reason=$@;
646                                 error(sprintf(gettext("failed to load external plugin needed for %s plugin: %s"), $plugin, $reason));
647                         }
648                         import IkiWiki::Plugin::external "$dir/plugins/$plugin";
649                         $loaded_plugins{$plugin}=1;
650                         return 1;
651                 }
652         }
653
654         my $mod="IkiWiki::Plugin::".possibly_foolish_untaint($plugin);
655         eval qq{use $mod};
656         if ($@) {
657                 error("Failed to load plugin $mod: $@");
658         }
659         $loaded_plugins{$plugin}=1;
660         return 1;
661 }
662
663 sub error ($;$) {
664         my $message=shift;
665         my $cleaner=shift;
666         log_message('err' => $message) if $config{syslog};
667         if (defined $cleaner) {
668                 $cleaner->();
669         }
670         die $message."\n";
671 }
672
673 sub debug ($) {
674         return unless $config{verbose};
675         return log_message(debug => @_);
676 }
677
678 my $log_open=0;
679 sub log_message ($$) {
680         my $type=shift;
681
682         if ($config{syslog}) {
683                 require Sys::Syslog;
684                 if (! $log_open) {
685                         Sys::Syslog::setlogsock('unix');
686                         Sys::Syslog::openlog('ikiwiki', '', 'user');
687                         $log_open=1;
688                 }
689                 return eval {
690                         Sys::Syslog::syslog($type, "[$config{wikiname}] %s", join(" ", @_));
691                 };
692         }
693         elsif (! $config{cgi}) {
694                 return print "@_\n";
695         }
696         else {
697                 return print STDERR "@_\n";
698         }
699 }
700
701 sub possibly_foolish_untaint ($) {
702         my $tainted=shift;
703         my ($untainted)=$tainted=~/(.*)/s;
704         return $untainted;
705 }
706
707 sub basename ($) {
708         my $file=shift;
709
710         $file=~s!.*/+!!;
711         return $file;
712 }
713
714 sub dirname ($) {
715         my $file=shift;
716
717         $file=~s!/*[^/]+$!!;
718         return $file;
719 }
720
721 sub isinternal ($) {
722         my $page=shift;
723         return exists $pagesources{$page} &&
724                 $pagesources{$page} =~ /\._([^.]+)$/;
725 }
726
727 sub pagetype ($) {
728         my $file=shift;
729         
730         if ($file =~ /\.([^.]+)$/) {
731                 return $1 if exists $hooks{htmlize}{$1};
732         }
733         my $base=basename($file);
734         if (exists $hooks{htmlize}{$base} &&
735             $hooks{htmlize}{$base}{noextension}) {
736                 return $base;
737         }
738         return;
739 }
740
741 my %pagename_cache;
742
743 sub pagename ($) {
744         my $file=shift;
745
746         if (exists $pagename_cache{$file}) {
747                 return $pagename_cache{$file};
748         }
749
750         my $type=pagetype($file);
751         my $page=$file;
752         $page=~s/\Q.$type\E*$//
753                 if defined $type && !$hooks{htmlize}{$type}{keepextension}
754                         && !$hooks{htmlize}{$type}{noextension};
755         if ($config{indexpages} && $page=~/(.*)\/index$/) {
756                 $page=$1;
757         }
758
759         $pagename_cache{$file} = $page;
760         return $page;
761 }
762
763 sub newpagefile ($$) {
764         my $page=shift;
765         my $type=shift;
766
767         if (! $config{indexpages} || $page eq 'index') {
768                 return $page.".".$type;
769         }
770         else {
771                 return $page."/index.".$type;
772         }
773 }
774
775 sub targetpage ($$;$) {
776         my $page=shift;
777         my $ext=shift;
778         my $filename=shift;
779         
780         if (defined $filename) {
781                 return $page."/".$filename.".".$ext;
782         }
783         elsif (! $config{usedirs} || $page eq 'index') {
784                 return $page.".".$ext;
785         }
786         else {
787                 return $page."/index.".$ext;
788         }
789 }
790
791 sub htmlpage ($) {
792         my $page=shift;
793         
794         return targetpage($page, $config{htmlext});
795 }
796
797 sub srcfile_stat {
798         my $file=shift;
799         my $nothrow=shift;
800
801         return "$config{srcdir}/$file", stat(_) if -e "$config{srcdir}/$file";
802         foreach my $dir (@{$config{underlaydirs}}, $config{underlaydir}) {
803                 return "$dir/$file", stat(_) if -e "$dir/$file";
804         }
805         error("internal error: $file cannot be found in $config{srcdir} or underlay") unless $nothrow;
806         return;
807 }
808
809 sub srcfile ($;$) {
810         return (srcfile_stat(@_))[0];
811 }
812
813 sub add_underlay ($) {
814         my $dir=shift;
815
816         if ($dir !~ /^\//) {
817                 $dir="$config{underlaydirbase}/$dir";
818         }
819
820         if (! grep { $_ eq $dir } @{$config{underlaydirs}}) {
821                 unshift @{$config{underlaydirs}}, $dir;
822         }
823
824         return 1;
825 }
826
827 sub readfile ($;$$) {
828         my $file=shift;
829         my $binary=shift;
830         my $wantfd=shift;
831
832         if (-l $file) {
833                 error("cannot read a symlink ($file)");
834         }
835         
836         local $/=undef;
837         open (my $in, "<", $file) || error("failed to read $file: $!");
838         binmode($in) if ($binary);
839         return \*$in if $wantfd;
840         my $ret=<$in>;
841         # check for invalid utf-8, and toss it back to avoid crashes
842         if (! utf8::valid($ret)) {
843                 $ret=encode_utf8($ret);
844         }
845         close $in || error("failed to read $file: $!");
846         return $ret;
847 }
848
849 sub prep_writefile ($$) {
850         my $file=shift;
851         my $destdir=shift;
852         
853         my $test=$file;
854         while (length $test) {
855                 if (-l "$destdir/$test") {
856                         error("cannot write to a symlink ($test)");
857                 }
858                 if (-f _ && $test ne $file) {
859                         # Remove conflicting file.
860                         foreach my $p (keys %renderedfiles, keys %oldrenderedfiles) {
861                                 foreach my $f (@{$renderedfiles{$p}}, @{$oldrenderedfiles{$p}}) {
862                                         if ($f eq $test) {
863                                                 unlink("$destdir/$test");
864                                                 last;
865                                         }
866                                 }
867                         }
868                 }
869                 $test=dirname($test);
870         }
871
872         my $dir=dirname("$destdir/$file");
873         if (! -d $dir) {
874                 my $d="";
875                 foreach my $s (split(m!/+!, $dir)) {
876                         $d.="$s/";
877                         if (! -d $d) {
878                                 mkdir($d) || error("failed to create directory $d: $!");
879                         }
880                 }
881         }
882
883         return 1;
884 }
885
886 sub writefile ($$$;$$) {
887         my $file=shift; # can include subdirs
888         my $destdir=shift; # directory to put file in
889         my $content=shift;
890         my $binary=shift;
891         my $writer=shift;
892         
893         prep_writefile($file, $destdir);
894         
895         my $newfile="$destdir/$file.ikiwiki-new";
896         if (-l $newfile) {
897                 error("cannot write to a symlink ($newfile)");
898         }
899         
900         my $cleanup = sub { unlink($newfile) };
901         open (my $out, '>', $newfile) || error("failed to write $newfile: $!", $cleanup);
902         binmode($out) if ($binary);
903         if ($writer) {
904                 $writer->(\*$out, $cleanup);
905         }
906         else {
907                 print $out $content or error("failed writing to $newfile: $!", $cleanup);
908         }
909         close $out || error("failed saving $newfile: $!", $cleanup);
910         rename($newfile, "$destdir/$file") || 
911                 error("failed renaming $newfile to $destdir/$file: $!", $cleanup);
912
913         return 1;
914 }
915
916 my %cleared;
917 sub will_render ($$;$) {
918         my $page=shift;
919         my $dest=shift;
920         my $clear=shift;
921
922         # Important security check for independently created files.
923         if (-e "$config{destdir}/$dest" && ! $config{rebuild} &&
924             ! grep { $_ eq $dest } (@{$renderedfiles{$page}}, @{$oldrenderedfiles{$page}}, @{$wikistate{editpage}{previews}})) {
925                 my $from_other_page=0;
926                 # Expensive, but rarely runs.
927                 foreach my $p (keys %renderedfiles, keys %oldrenderedfiles) {
928                         if (grep {
929                                 $_ eq $dest ||
930                                 dirname($_) eq $dest
931                             } @{$renderedfiles{$p}}, @{$oldrenderedfiles{$p}}) {
932                                 $from_other_page=1;
933                                 last;
934                         }
935                 }
936
937                 error("$config{destdir}/$dest independently created, not overwriting with version from $page")
938                         unless $from_other_page;
939         }
940
941         # If $dest exists as a directory, remove conflicting files in it
942         # rendered from other pages.
943         if (-d _) {
944                 foreach my $p (keys %renderedfiles, keys %oldrenderedfiles) {
945                         foreach my $f (@{$renderedfiles{$p}}, @{$oldrenderedfiles{$p}}) {
946                                 if (dirname($f) eq $dest) {
947                                         unlink("$config{destdir}/$f");
948                                         rmdir(dirname("$config{destdir}/$f"));
949                                 }
950                         }
951                 }
952         }
953
954         if (! $clear || $cleared{$page}) {
955                 $renderedfiles{$page}=[$dest, grep { $_ ne $dest } @{$renderedfiles{$page}}];
956         }
957         else {
958                 foreach my $old (@{$renderedfiles{$page}}) {
959                         delete $destsources{$old};
960                 }
961                 $renderedfiles{$page}=[$dest];
962                 $cleared{$page}=1;
963         }
964         $destsources{$dest}=$page;
965
966         return 1;
967 }
968
969 sub bestlink ($$) {
970         my $page=shift;
971         my $link=shift;
972         
973         my $cwd=$page;
974         if ($link=~s/^\/+//) {
975                 # absolute links
976                 $cwd="";
977         }
978         $link=~s/\/$//;
979
980         do {
981                 my $l=$cwd;
982                 $l.="/" if length $l;
983                 $l.=$link;
984
985                 if (exists $pagesources{$l}) {
986                         return $l;
987                 }
988                 elsif (exists $pagecase{lc $l}) {
989                         return $pagecase{lc $l};
990                 }
991         } while $cwd=~s{/?[^/]+$}{};
992
993         if (length $config{userdir}) {
994                 my $l = "$config{userdir}/".lc($link);
995                 if (exists $pagesources{$l}) {
996                         return $l;
997                 }
998                 elsif (exists $pagecase{lc $l}) {
999                         return $pagecase{lc $l};
1000                 }
1001         }
1002
1003         #print STDERR "warning: page $page, broken link: $link\n";
1004         return "";
1005 }
1006
1007 sub isinlinableimage ($) {
1008         my $file=shift;
1009         
1010         return $file =~ /\.(png|gif|jpg|jpeg)$/i;
1011 }
1012
1013 sub pagetitle ($;$) {
1014         my $page=shift;
1015         my $unescaped=shift;
1016
1017         if ($unescaped) {
1018                 $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : chr($2)/eg;
1019         }
1020         else {
1021                 $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : "&#$2;"/eg;
1022         }
1023
1024         return $page;
1025 }
1026
1027 sub titlepage ($) {
1028         my $title=shift;
1029         # support use w/o %config set
1030         my $chars = defined $config{wiki_file_chars} ? $config{wiki_file_chars} : "-[:alnum:]+/.:_";
1031         $title=~s/([^$chars]|_)/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
1032         return $title;
1033 }
1034
1035 sub linkpage ($) {
1036         my $link=shift;
1037         my $chars = defined $config{wiki_file_chars} ? $config{wiki_file_chars} : "-[:alnum:]+/.:_";
1038         $link=~s/([^$chars])/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
1039         return $link;
1040 }
1041
1042 sub cgiurl (@) {
1043         my %params=@_;
1044
1045         my $cgiurl=$local_cgiurl;
1046
1047         if (exists $params{cgiurl}) {
1048                 $cgiurl=$params{cgiurl};
1049                 delete $params{cgiurl};
1050         }
1051
1052         unless (%params) {
1053                 return $cgiurl;
1054         }
1055
1056         return $cgiurl."?".
1057                 join("&amp;", map $_."=".uri_escape_utf8($params{$_}), keys %params);
1058 }
1059
1060 sub baseurl (;$) {
1061         my $page=shift;
1062
1063         return $local_url if ! defined $page;
1064         
1065         $page=htmlpage($page);
1066         $page=~s/[^\/]+$//;
1067         $page=~s/[^\/]+\//..\//g;
1068         return $page;
1069 }
1070
1071 sub abs2rel ($$) {
1072         # Work around very innefficient behavior in File::Spec if abs2rel
1073         # is passed two relative paths. It's much faster if paths are
1074         # absolute! (Debian bug #376658; fixed in debian unstable now)
1075         my $path="/".shift;
1076         my $base="/".shift;
1077
1078         require File::Spec;
1079         my $ret=File::Spec->abs2rel($path, $base);
1080         $ret=~s/^// if defined $ret;
1081         return $ret;
1082 }
1083
1084 sub displaytime ($;$$) {
1085         # Plugins can override this function to mark up the time to
1086         # display.
1087         my $time=formattime($_[0], $_[1]);
1088         if ($config{html5}) {
1089                 return '<time datetime="'.date_3339($_[0]).'"'.
1090                         ($_[2] ? ' pubdate="pubdate"' : '').
1091                         '>'.$time.'</time>';
1092         }
1093         else {
1094                 return '<span class="date">'.$time.'</span>';
1095         }
1096 }
1097
1098 sub formattime ($;$) {
1099         # Plugins can override this function to format the time.
1100         my $time=shift;
1101         my $format=shift;
1102         if (! defined $format) {
1103                 $format=$config{timeformat};
1104         }
1105
1106         # strftime doesn't know about encodings, so make sure
1107         # its output is properly treated as utf8
1108         return decode_utf8(POSIX::strftime($format, localtime($time)));
1109 }
1110
1111 sub date_3339 ($) {
1112         my $time=shift;
1113
1114         my $lc_time=POSIX::setlocale(&POSIX::LC_TIME);
1115         POSIX::setlocale(&POSIX::LC_TIME, "C");
1116         my $ret=POSIX::strftime("%Y-%m-%dT%H:%M:%SZ", gmtime($time));
1117         POSIX::setlocale(&POSIX::LC_TIME, $lc_time);
1118         return $ret;
1119 }
1120
1121 sub beautify_urlpath ($) {
1122         my $url=shift;
1123
1124         # Ensure url is not an empty link, and if necessary,
1125         # add ./ to avoid colon confusion.
1126         if ($url !~ /^\// && $url !~ /^\.\.?\//) {
1127                 $url="./$url";
1128         }
1129
1130         if ($config{usedirs}) {
1131                 $url =~ s!/index.$config{htmlext}$!/!;
1132         }
1133
1134         return $url;
1135 }
1136
1137 sub urlto ($;$$) {
1138         my $to=shift;
1139         my $from=shift;
1140         my $absolute=shift;
1141         
1142         if (! length $to) {
1143                 $to = 'index';
1144         }
1145
1146         if (! $destsources{$to}) {
1147                 $to=htmlpage($to);
1148         }
1149
1150         if ($absolute) {
1151                 return $config{url}.beautify_urlpath("/".$to);
1152         }
1153
1154         if (! defined $from) {
1155                 my $u = $local_url;
1156                 $u =~ s{/$}{};
1157                 return $u.beautify_urlpath("/".$to);
1158         }
1159
1160         my $link = abs2rel($to, dirname(htmlpage($from)));
1161
1162         return beautify_urlpath($link);
1163 }
1164
1165 sub isselflink ($$) {
1166         # Plugins can override this function to support special types
1167         # of selflinks.
1168         my $page=shift;
1169         my $link=shift;
1170
1171         return $page eq $link;
1172 }
1173
1174 sub htmllink ($$$;@) {
1175         my $lpage=shift; # the page doing the linking
1176         my $page=shift; # the page that will contain the link (different for inline)
1177         my $link=shift;
1178         my %opts=@_;
1179
1180         $link=~s/\/$//;
1181
1182         my $bestlink;
1183         if (! $opts{forcesubpage}) {
1184                 $bestlink=bestlink($lpage, $link);
1185         }
1186         else {
1187                 $bestlink="$lpage/".lc($link);
1188         }
1189
1190         my $linktext;
1191         if (defined $opts{linktext}) {
1192                 $linktext=$opts{linktext};
1193         }
1194         else {
1195                 $linktext=pagetitle(basename($link));
1196         }
1197         
1198         return "<span class=\"selflink\">$linktext</span>"
1199                 if length $bestlink && isselflink($page, $bestlink) &&
1200                    ! defined $opts{anchor};
1201         
1202         if (! $destsources{$bestlink}) {
1203                 $bestlink=htmlpage($bestlink);
1204
1205                 if (! $destsources{$bestlink}) {
1206                         my $cgilink = "";
1207                         if (length $config{cgiurl}) {
1208                                 $cgilink = "<a href=\"".
1209                                         cgiurl(
1210                                                 do => "create",
1211                                                 page => lc($link),
1212                                                 from => $lpage
1213                                         )."\" rel=\"nofollow\">?</a>";
1214                         }
1215                         return "<span class=\"createlink\">$cgilink$linktext</span>"
1216                 }
1217         }
1218         
1219         $bestlink=abs2rel($bestlink, dirname(htmlpage($page)));
1220         $bestlink=beautify_urlpath($bestlink);
1221         
1222         if (! $opts{noimageinline} && isinlinableimage($bestlink)) {
1223                 return "<img src=\"$bestlink\" alt=\"$linktext\" />";
1224         }
1225
1226         if (defined $opts{anchor}) {
1227                 $bestlink.="#".$opts{anchor};
1228         }
1229
1230         my @attrs;
1231         foreach my $attr (qw{rel class title}) {
1232                 if (defined $opts{$attr}) {
1233                         push @attrs, " $attr=\"$opts{$attr}\"";
1234                 }
1235         }
1236
1237         return "<a href=\"$bestlink\"@attrs>$linktext</a>";
1238 }
1239
1240 sub userpage ($) {
1241         my $user=shift;
1242         return length $config{userdir} ? "$config{userdir}/$user" : $user;
1243 }
1244
1245 sub openiduser ($) {
1246         my $user=shift;
1247
1248         if (defined $user && $user =~ m!^https?://! &&
1249             eval q{use Net::OpenID::VerifiedIdentity; 1} && !$@) {
1250                 my $display;
1251
1252                 if (Net::OpenID::VerifiedIdentity->can("DisplayOfURL")) {
1253                         $display = Net::OpenID::VerifiedIdentity::DisplayOfURL($user);
1254                 }
1255                 else {
1256                         # backcompat with old version
1257                         my $oid=Net::OpenID::VerifiedIdentity->new(identity => $user);
1258                         $display=$oid->display;
1259                 }
1260
1261                 # Convert "user.somehost.com" to "user [somehost.com]"
1262                 # (also "user.somehost.co.uk")
1263                 if ($display !~ /\[/) {
1264                         $display=~s/^([-a-zA-Z0-9]+?)\.([-.a-zA-Z0-9]+\.[a-z]+)$/$1 [$2]/;
1265                 }
1266                 # Convert "http://somehost.com/user" to "user [somehost.com]".
1267                 # (also "https://somehost.com/user/")
1268                 if ($display !~ /\[/) {
1269                         $display=~s/^https?:\/\/(.+)\/([^\/#?]+)\/?(?:[#?].*)?$/$2 [$1]/;
1270                 }
1271                 $display=~s!^https?://!!; # make sure this is removed
1272                 eval q{use CGI 'escapeHTML'};
1273                 error($@) if $@;
1274                 return escapeHTML($display);
1275         }
1276         return;
1277 }
1278
1279 sub htmlize ($$$$) {
1280         my $page=shift;
1281         my $destpage=shift;
1282         my $type=shift;
1283         my $content=shift;
1284         
1285         my $oneline = $content !~ /\n/;
1286         
1287         if (exists $hooks{htmlize}{$type}) {
1288                 $content=$hooks{htmlize}{$type}{call}->(
1289                         page => $page,
1290                         content => $content,
1291                 );
1292         }
1293         else {
1294                 error("htmlization of $type not supported");
1295         }
1296
1297         run_hooks(sanitize => sub {
1298                 $content=shift->(
1299                         page => $page,
1300                         destpage => $destpage,
1301                         content => $content,
1302                 );
1303         });
1304         
1305         if ($oneline) {
1306                 # hack to get rid of enclosing junk added by markdown
1307                 # and other htmlizers/sanitizers
1308                 $content=~s/^<p>//i;
1309                 $content=~s/<\/p>\n*$//i;
1310         }
1311
1312         return $content;
1313 }
1314
1315 sub linkify ($$$) {
1316         my $page=shift;
1317         my $destpage=shift;
1318         my $content=shift;
1319
1320         run_hooks(linkify => sub {
1321                 $content=shift->(
1322                         page => $page,
1323                         destpage => $destpage,
1324                         content => $content,
1325                 );
1326         });
1327         
1328         return $content;
1329 }
1330
1331 our %preprocessing;
1332 our $preprocess_preview=0;
1333 sub preprocess ($$$;$$) {
1334         my $page=shift; # the page the data comes from
1335         my $destpage=shift; # the page the data will appear in (different for inline)
1336         my $content=shift;
1337         my $scan=shift;
1338         my $preview=shift;
1339
1340         # Using local because it needs to be set within any nested calls
1341         # of this function.
1342         local $preprocess_preview=$preview if defined $preview;
1343
1344         my $handle=sub {
1345                 my $escape=shift;
1346                 my $prefix=shift;
1347                 my $command=shift;
1348                 my $params=shift;
1349                 $params="" if ! defined $params;
1350
1351                 if (length $escape) {
1352                         return "[[$prefix$command $params]]";
1353                 }
1354                 elsif (exists $hooks{preprocess}{$command}) {
1355                         return "" if $scan && ! $hooks{preprocess}{$command}{scan};
1356                         # Note: preserve order of params, some plugins may
1357                         # consider it significant.
1358                         my @params;
1359                         while ($params =~ m{
1360                                 (?:([-\w]+)=)?          # 1: named parameter key?
1361                                 (?:
1362                                         """(.*?)"""     # 2: triple-quoted value
1363                                 |
1364                                         "([^"]*?)"      # 3: single-quoted value
1365                                 |
1366                                         (\S+)           # 4: unquoted value
1367                                 )
1368                                 (?:\s+|$)               # delimiter to next param
1369                         }sgx) {
1370                                 my $key=$1;
1371                                 my $val;
1372                                 if (defined $2) {
1373                                         $val=$2;
1374                                         $val=~s/\r\n/\n/mg;
1375                                         $val=~s/^\n+//g;
1376                                         $val=~s/\n+$//g;
1377                                 }
1378                                 elsif (defined $3) {
1379                                         $val=$3;
1380                                 }
1381                                 elsif (defined $4) {
1382                                         $val=$4;
1383                                 }
1384
1385                                 if (defined $key) {
1386                                         push @params, $key, $val;
1387                                 }
1388                                 else {
1389                                         push @params, $val, '';
1390                                 }
1391                         }
1392                         if ($preprocessing{$page}++ > 3) {
1393                                 # Avoid loops of preprocessed pages preprocessing
1394                                 # other pages that preprocess them, etc.
1395                                 return "[[!$command <span class=\"error\">".
1396                                         sprintf(gettext("preprocessing loop detected on %s at depth %i"),
1397                                                 $page, $preprocessing{$page}).
1398                                         "</span>]]";
1399                         }
1400                         my $ret;
1401                         if (! $scan) {
1402                                 $ret=eval {
1403                                         $hooks{preprocess}{$command}{call}->(
1404                                                 @params,
1405                                                 page => $page,
1406                                                 destpage => $destpage,
1407                                                 preview => $preprocess_preview,
1408                                         );
1409                                 };
1410                                 if ($@) {
1411                                         my $error=$@;
1412                                         chomp $error;
1413                                         $ret="[[!$command <span class=\"error\">".
1414                                                 gettext("Error").": $error"."</span>]]";
1415                                 }
1416                         }
1417                         else {
1418                                 # use void context during scan pass
1419                                 eval {
1420                                         $hooks{preprocess}{$command}{call}->(
1421                                                 @params,
1422                                                 page => $page,
1423                                                 destpage => $destpage,
1424                                                 preview => $preprocess_preview,
1425                                         );
1426                                 };
1427                                 $ret="";
1428                         }
1429                         $preprocessing{$page}--;
1430                         return $ret;
1431                 }
1432                 else {
1433                         return "[[$prefix$command $params]]";
1434                 }
1435         };
1436         
1437         my $regex;
1438         if ($config{prefix_directives}) {
1439                 $regex = qr{
1440                         (\\?)           # 1: escape?
1441                         \[\[(!)         # directive open; 2: prefix
1442                         ([-\w]+)        # 3: command
1443                         (               # 4: the parameters..
1444                                 \s+     # Must have space if parameters present
1445                                 (?:
1446                                         (?:[-\w]+=)?            # named parameter key?
1447                                         (?:
1448                                                 """.*?"""       # triple-quoted value
1449                                                 |
1450                                                 "[^"]*?"        # single-quoted value
1451                                                 |
1452                                                 [^"\s\]]+       # unquoted value
1453                                         )
1454                                         \s*                     # whitespace or end
1455                                                                 # of directive
1456                                 )
1457                         *)?             # 0 or more parameters
1458                         \]\]            # directive closed
1459                 }sx;
1460         }
1461         else {
1462                 $regex = qr{
1463                         (\\?)           # 1: escape?
1464                         \[\[(!?)        # directive open; 2: optional prefix
1465                         ([-\w]+)        # 3: command
1466                         \s+
1467                         (               # 4: the parameters..
1468                                 (?:
1469                                         (?:[-\w]+=)?            # named parameter key?
1470                                         (?:
1471                                                 """.*?"""       # triple-quoted value
1472                                                 |
1473                                                 "[^"]*?"        # single-quoted value
1474                                                 |
1475                                                 [^"\s\]]+       # unquoted value
1476                                         )
1477                                         \s*                     # whitespace or end
1478                                                                 # of directive
1479                                 )
1480                         *)              # 0 or more parameters
1481                         \]\]            # directive closed
1482                 }sx;
1483         }
1484
1485         $content =~ s{$regex}{$handle->($1, $2, $3, $4)}eg;
1486         return $content;
1487 }
1488
1489 sub filter ($$$) {
1490         my $page=shift;
1491         my $destpage=shift;
1492         my $content=shift;
1493
1494         run_hooks(filter => sub {
1495                 $content=shift->(page => $page, destpage => $destpage, 
1496                         content => $content);
1497         });
1498
1499         return $content;
1500 }
1501
1502 sub check_canedit ($$$;$) {
1503         my $page=shift;
1504         my $q=shift;
1505         my $session=shift;
1506         my $nonfatal=shift;
1507         
1508         my $canedit;
1509         run_hooks(canedit => sub {
1510                 return if defined $canedit;
1511                 my $ret=shift->($page, $q, $session);
1512                 if (defined $ret) {
1513                         if ($ret eq "") {
1514                                 $canedit=1;
1515                         }
1516                         elsif (ref $ret eq 'CODE') {
1517                                 $ret->() unless $nonfatal;
1518                                 $canedit=0;
1519                         }
1520                         elsif (defined $ret) {
1521                                 error($ret) unless $nonfatal;
1522                                 $canedit=0;
1523                         }
1524                 }
1525         });
1526         return defined $canedit ? $canedit : 1;
1527 }
1528
1529 sub check_content (@) {
1530         my %params=@_;
1531         
1532         return 1 if ! exists $hooks{checkcontent}; # optimisation
1533
1534         if (exists $pagesources{$params{page}}) {
1535                 my @diff;
1536                 my %old=map { $_ => 1 }
1537                         split("\n", readfile(srcfile($pagesources{$params{page}})));
1538                 foreach my $line (split("\n", $params{content})) {
1539                         push @diff, $line if ! exists $old{$line};
1540                 }
1541                 $params{diff}=join("\n", @diff);
1542         }
1543
1544         my $ok;
1545         run_hooks(checkcontent => sub {
1546                 return if defined $ok;
1547                 my $ret=shift->(%params);
1548                 if (defined $ret) {
1549                         if ($ret eq "") {
1550                                 $ok=1;
1551                         }
1552                         elsif (ref $ret eq 'CODE') {
1553                                 $ret->() unless $params{nonfatal};
1554                                 $ok=0;
1555                         }
1556                         elsif (defined $ret) {
1557                                 error($ret) unless $params{nonfatal};
1558                                 $ok=0;
1559                         }
1560                 }
1561
1562         });
1563         return defined $ok ? $ok : 1;
1564 }
1565
1566 sub check_canchange (@) {
1567         my %params = @_;
1568         my $cgi = $params{cgi};
1569         my $session = $params{session};
1570         my @changes = @{$params{changes}};
1571
1572         my %newfiles;
1573         foreach my $change (@changes) {
1574                 # This untaint is safe because we check file_pruned and
1575                 # wiki_file_regexp.
1576                 my ($file)=$change->{file}=~/$config{wiki_file_regexp}/;
1577                 $file=possibly_foolish_untaint($file);
1578                 if (! defined $file || ! length $file ||
1579                     file_pruned($file)) {
1580                         error(gettext("bad file name %s"), $file);
1581                 }
1582
1583                 my $type=pagetype($file);
1584                 my $page=pagename($file) if defined $type;
1585
1586                 if ($change->{action} eq 'add') {
1587                         $newfiles{$file}=1;
1588                 }
1589
1590                 if ($change->{action} eq 'change' ||
1591                     $change->{action} eq 'add') {
1592                         if (defined $page) {
1593                                 check_canedit($page, $cgi, $session);
1594                                 next;
1595                         }
1596                         else {
1597                                 if (IkiWiki::Plugin::attachment->can("check_canattach")) {
1598                                         IkiWiki::Plugin::attachment::check_canattach($session, $file, $change->{path});
1599                                         check_canedit($file, $cgi, $session);
1600                                         next;
1601                                 }
1602                         }
1603                 }
1604                 elsif ($change->{action} eq 'remove') {
1605                         # check_canremove tests to see if the file is present
1606                         # on disk. This will fail when a single commit adds a
1607                         # file and then removes it again. Avoid the problem
1608                         # by not testing the removal in such pairs of changes.
1609                         # (The add is still tested, just to make sure that
1610                         # no data is added to the repo that a web edit
1611                         # could not add.)
1612                         next if $newfiles{$file};
1613
1614                         if (IkiWiki::Plugin::remove->can("check_canremove")) {
1615                                 IkiWiki::Plugin::remove::check_canremove(defined $page ? $page : $file, $cgi, $session);
1616                                 check_canedit(defined $page ? $page : $file, $cgi, $session);
1617                                 next;
1618                         }
1619                 }
1620                 else {
1621                         error "unknown action ".$change->{action};
1622                 }
1623
1624                 error sprintf(gettext("you are not allowed to change %s"), $file);
1625         }
1626 }
1627
1628
1629 my $wikilock;
1630
1631 sub lockwiki () {
1632         # Take an exclusive lock on the wiki to prevent multiple concurrent
1633         # run issues. The lock will be dropped on program exit.
1634         if (! -d $config{wikistatedir}) {
1635                 mkdir($config{wikistatedir});
1636         }
1637         open($wikilock, '>', "$config{wikistatedir}/lockfile") ||
1638                 error ("cannot write to $config{wikistatedir}/lockfile: $!");
1639         if (! flock($wikilock, 2)) { # LOCK_EX
1640                 error("failed to get lock");
1641         }
1642         return 1;
1643 }
1644
1645 sub unlockwiki () {
1646         POSIX::close($ENV{IKIWIKI_CGILOCK_FD}) if exists $ENV{IKIWIKI_CGILOCK_FD};
1647         return close($wikilock) if $wikilock;
1648         return;
1649 }
1650
1651 my $commitlock;
1652
1653 sub commit_hook_enabled () {
1654         open($commitlock, '+>', "$config{wikistatedir}/commitlock") ||
1655                 error("cannot write to $config{wikistatedir}/commitlock: $!");
1656         if (! flock($commitlock, 1 | 4)) { # LOCK_SH | LOCK_NB to test
1657                 close($commitlock) || error("failed closing commitlock: $!");
1658                 return 0;
1659         }
1660         close($commitlock) || error("failed closing commitlock: $!");
1661         return 1;
1662 }
1663
1664 sub disable_commit_hook () {
1665         open($commitlock, '>', "$config{wikistatedir}/commitlock") ||
1666                 error("cannot write to $config{wikistatedir}/commitlock: $!");
1667         if (! flock($commitlock, 2)) { # LOCK_EX
1668                 error("failed to get commit lock");
1669         }
1670         return 1;
1671 }
1672
1673 sub enable_commit_hook () {
1674         return close($commitlock) if $commitlock;
1675         return;
1676 }
1677
1678 sub loadindex () {
1679         %oldrenderedfiles=%pagectime=();
1680         if (! $config{rebuild}) {
1681                 %pagesources=%pagemtime=%oldlinks=%links=%depends=
1682                 %destsources=%renderedfiles=%pagecase=%pagestate=
1683                 %depends_simple=%typedlinks=%oldtypedlinks=();
1684         }
1685         my $in;
1686         if (! open ($in, "<", "$config{wikistatedir}/indexdb")) {
1687                 if (-e "$config{wikistatedir}/index") {
1688                         system("ikiwiki-transition", "indexdb", $config{srcdir});
1689                         open ($in, "<", "$config{wikistatedir}/indexdb") || return;
1690                 }
1691                 else {
1692                         $config{gettime}=1; # first build
1693                         return;
1694                 }
1695         }
1696
1697         my $index=Storable::fd_retrieve($in);
1698         if (! defined $index) {
1699                 return 0;
1700         }
1701
1702         my $pages;
1703         if (exists $index->{version} && ! ref $index->{version}) {
1704                 $pages=$index->{page};
1705                 %wikistate=%{$index->{state}};
1706                 # Handle plugins that got disabled by loading a new setup.
1707                 if (exists $config{setupfile}) {
1708                         require IkiWiki::Setup;
1709                         IkiWiki::Setup::disabled_plugins(
1710                                 grep { ! $loaded_plugins{$_} } keys %wikistate);
1711                 }
1712         }
1713         else {
1714                 $pages=$index;
1715                 %wikistate=();
1716         }
1717
1718         foreach my $src (keys %$pages) {
1719                 my $d=$pages->{$src};
1720                 my $page=pagename($src);
1721                 $pagectime{$page}=$d->{ctime};
1722                 $pagesources{$page}=$src;
1723                 if (! $config{rebuild}) {
1724                         $pagemtime{$page}=$d->{mtime};
1725                         $renderedfiles{$page}=$d->{dest};
1726                         if (exists $d->{links} && ref $d->{links}) {
1727                                 $links{$page}=$d->{links};
1728                                 $oldlinks{$page}=[@{$d->{links}}];
1729                         }
1730                         if (ref $d->{depends_simple} eq 'ARRAY') {
1731                                 # old format
1732                                 $depends_simple{$page}={
1733                                         map { $_ => 1 } @{$d->{depends_simple}}
1734                                 };
1735                         }
1736                         elsif (exists $d->{depends_simple}) {
1737                                 $depends_simple{$page}=$d->{depends_simple};
1738                         }
1739                         if (exists $d->{dependslist}) {
1740                                 # old format
1741                                 $depends{$page}={
1742                                         map { $_ => $DEPEND_CONTENT }
1743                                                 @{$d->{dependslist}}
1744                                 };
1745                         }
1746                         elsif (exists $d->{depends} && ! ref $d->{depends}) {
1747                                 # old format
1748                                 $depends{$page}={$d->{depends} => $DEPEND_CONTENT };
1749                         }
1750                         elsif (exists $d->{depends}) {
1751                                 $depends{$page}=$d->{depends};
1752                         }
1753                         if (exists $d->{state}) {
1754                                 $pagestate{$page}=$d->{state};
1755                         }
1756                         if (exists $d->{typedlinks}) {
1757                                 $typedlinks{$page}=$d->{typedlinks};
1758
1759                                 while (my ($type, $links) = each %{$typedlinks{$page}}) {
1760                                         next unless %$links;
1761                                         $oldtypedlinks{$page}{$type} = {%$links};
1762                                 }
1763                         }
1764                 }
1765                 $oldrenderedfiles{$page}=[@{$d->{dest}}];
1766         }
1767         foreach my $page (keys %pagesources) {
1768                 $pagecase{lc $page}=$page;
1769         }
1770         foreach my $page (keys %renderedfiles) {
1771                 $destsources{$_}=$page foreach @{$renderedfiles{$page}};
1772         }
1773         return close($in);
1774 }
1775
1776 sub saveindex () {
1777         run_hooks(savestate => sub { shift->() });
1778
1779         my @plugins=keys %loaded_plugins;
1780
1781         if (! -d $config{wikistatedir}) {
1782                 mkdir($config{wikistatedir});
1783         }
1784         my $newfile="$config{wikistatedir}/indexdb.new";
1785         my $cleanup = sub { unlink($newfile) };
1786         open (my $out, '>', $newfile) || error("cannot write to $newfile: $!", $cleanup);
1787
1788         my %index;
1789         foreach my $page (keys %pagemtime) {
1790                 next unless $pagemtime{$page};
1791                 my $src=$pagesources{$page};
1792
1793                 $index{page}{$src}={
1794                         ctime => $pagectime{$page},
1795                         mtime => $pagemtime{$page},
1796                         dest => $renderedfiles{$page},
1797                         links => $links{$page},
1798                 };
1799
1800                 if (exists $depends{$page}) {
1801                         $index{page}{$src}{depends} = $depends{$page};
1802                 }
1803
1804                 if (exists $depends_simple{$page}) {
1805                         $index{page}{$src}{depends_simple} = $depends_simple{$page};
1806                 }
1807
1808                 if (exists $typedlinks{$page} && %{$typedlinks{$page}}) {
1809                         $index{page}{$src}{typedlinks} = $typedlinks{$page};
1810                 }
1811
1812                 if (exists $pagestate{$page}) {
1813                         foreach my $id (@plugins) {
1814                                 foreach my $key (keys %{$pagestate{$page}{$id}}) {
1815                                         $index{page}{$src}{state}{$id}{$key}=$pagestate{$page}{$id}{$key};
1816                                 }
1817                         }
1818                 }
1819         }
1820
1821         $index{state}={};
1822         foreach my $id (@plugins) {
1823                 $index{state}{$id}={}; # used to detect disabled plugins
1824                 foreach my $key (keys %{$wikistate{$id}}) {
1825                         $index{state}{$id}{$key}=$wikistate{$id}{$key};
1826                 }
1827         }
1828         
1829         $index{version}="3";
1830         my $ret=Storable::nstore_fd(\%index, $out);
1831         return if ! defined $ret || ! $ret;
1832         close $out || error("failed saving to $newfile: $!", $cleanup);
1833         rename($newfile, "$config{wikistatedir}/indexdb") ||
1834                 error("failed renaming $newfile to $config{wikistatedir}/indexdb", $cleanup);
1835         
1836         return 1;
1837 }
1838
1839 sub template_file ($) {
1840         my $name=shift;
1841         
1842         my $tpage=($name =~ s/^\///) ? $name : "templates/$name";
1843         my $template;
1844         if ($name !~ /\.tmpl$/ && exists $pagesources{$tpage}) {
1845                 $template=srcfile($pagesources{$tpage}, 1);
1846                 $name.=".tmpl";
1847         }
1848         else {
1849                 $template=srcfile($tpage, 1);
1850         }
1851
1852         if (defined $template) {
1853                 return $template, $tpage, 1 if wantarray;
1854                 return $template;
1855         }
1856         else {
1857                 $name=~s:/::; # avoid path traversal
1858                 foreach my $dir ($config{templatedir},
1859                                  "$installdir/share/ikiwiki/templates") {
1860                         if (-e "$dir/$name") {
1861                                 $template="$dir/$name";
1862                                 last;
1863                         }
1864                 }
1865                 if (defined $template) {        
1866                         return $template, $tpage if wantarray;
1867                         return $template;
1868                 }
1869         }
1870
1871         return;
1872 }
1873
1874 sub template_depends ($$;@) {
1875         my $name=shift;
1876         my $page=shift;
1877         
1878         my ($filename, $tpage, $untrusted)=template_file($name);
1879         if (! defined $filename) {
1880                 error(sprintf(gettext("template %s not found"), $name))
1881         }
1882
1883         if (defined $page && defined $tpage) {
1884                 add_depends($page, $tpage);
1885         }
1886         
1887         my @opts=(
1888                 filter => sub {
1889                         my $text_ref = shift;
1890                         ${$text_ref} = decode_utf8(${$text_ref});
1891                 },
1892                 loop_context_vars => 1,
1893                 die_on_bad_params => 0,
1894                 parent_global_vars => 1,
1895                 filename => $filename,
1896                 @_,
1897                 ($untrusted ? (no_includes => 1) : ()),
1898         );
1899         return @opts if wantarray;
1900
1901         require HTML::Template;
1902         return HTML::Template->new(@opts);
1903 }
1904
1905 sub template ($;@) {
1906         template_depends(shift, undef, @_);
1907 }
1908
1909 sub misctemplate ($$;@) {
1910         my $title=shift;
1911         my $content=shift;
1912         my %params=@_;
1913         
1914         my $template=template("page.tmpl");
1915
1916         my $page="";
1917         if (exists $params{page}) {
1918                 $page=delete $params{page};
1919         }
1920         run_hooks(pagetemplate => sub {
1921                 shift->(
1922                         page => $page,
1923                         destpage => $page,
1924                         template => $template,
1925                 );
1926         });
1927         templateactions($template, "");
1928
1929         $template->param(
1930                 dynamic => 1,
1931                 title => $title,
1932                 wikiname => $config{wikiname},
1933                 content => $content,
1934                 baseurl => baseurl(),
1935                 html5 => $config{html5},
1936                 %params,
1937         );
1938         
1939         return $template->output;
1940 }
1941
1942 sub templateactions ($$) {
1943         my $template=shift;
1944         my $page=shift;
1945
1946         my $have_actions=0;
1947         my @actions;
1948         run_hooks(pageactions => sub {
1949                 push @actions, map { { action => $_ } } 
1950                         grep { defined } shift->(page => $page);
1951         });
1952         $template->param(actions => \@actions);
1953
1954         if ($config{cgiurl} && exists $hooks{auth}) {
1955                 $template->param(prefsurl => cgiurl(do => "prefs"));
1956                 $have_actions=1;
1957         }
1958
1959         if ($have_actions || @actions) {
1960                 $template->param(have_actions => 1);
1961         }
1962 }
1963
1964 sub hook (@) {
1965         my %param=@_;
1966         
1967         if (! exists $param{type} || ! ref $param{call} || ! exists $param{id}) {
1968                 error 'hook requires type, call, and id parameters';
1969         }
1970
1971         return if $param{no_override} && exists $hooks{$param{type}}{$param{id}};
1972         
1973         $hooks{$param{type}}{$param{id}}=\%param;
1974         return 1;
1975 }
1976
1977 sub run_hooks ($$) {
1978         # Calls the given sub for each hook of the given type,
1979         # passing it the hook function to call.
1980         my $type=shift;
1981         my $sub=shift;
1982
1983         if (exists $hooks{$type}) {
1984                 my (@first, @middle, @last);
1985                 foreach my $id (keys %{$hooks{$type}}) {
1986                         if ($hooks{$type}{$id}{first}) {
1987                                 push @first, $id;
1988                         }
1989                         elsif ($hooks{$type}{$id}{last}) {
1990                                 push @last, $id;
1991                         }
1992                         else {
1993                                 push @middle, $id;
1994                         }
1995                 }
1996                 foreach my $id (@first, @middle, @last) {
1997                         $sub->($hooks{$type}{$id}{call});
1998                 }
1999         }
2000
2001         return 1;
2002 }
2003
2004 sub rcs_update () {
2005         $hooks{rcs}{rcs_update}{call}->(@_);
2006 }
2007
2008 sub rcs_prepedit ($) {
2009         $hooks{rcs}{rcs_prepedit}{call}->(@_);
2010 }
2011
2012 sub rcs_commit (@) {
2013         $hooks{rcs}{rcs_commit}{call}->(@_);
2014 }
2015
2016 sub rcs_commit_staged (@) {
2017         $hooks{rcs}{rcs_commit_staged}{call}->(@_);
2018 }
2019
2020 sub rcs_add ($) {
2021         $hooks{rcs}{rcs_add}{call}->(@_);
2022 }
2023
2024 sub rcs_remove ($) {
2025         $hooks{rcs}{rcs_remove}{call}->(@_);
2026 }
2027
2028 sub rcs_rename ($$) {
2029         $hooks{rcs}{rcs_rename}{call}->(@_);
2030 }
2031
2032 sub rcs_recentchanges ($) {
2033         $hooks{rcs}{rcs_recentchanges}{call}->(@_);
2034 }
2035
2036 sub rcs_diff ($) {
2037         $hooks{rcs}{rcs_diff}{call}->(@_);
2038 }
2039
2040 sub rcs_getctime ($) {
2041         $hooks{rcs}{rcs_getctime}{call}->(@_);
2042 }
2043
2044 sub rcs_getmtime ($) {
2045         $hooks{rcs}{rcs_getmtime}{call}->(@_);
2046 }
2047
2048 sub rcs_receive () {
2049         $hooks{rcs}{rcs_receive}{call}->();
2050 }
2051
2052 sub add_depends ($$;$) {
2053         my $page=shift;
2054         my $pagespec=shift;
2055         my $deptype=shift || $DEPEND_CONTENT;
2056
2057         # Is the pagespec a simple page name?
2058         if ($pagespec =~ /$config{wiki_file_regexp}/ &&
2059             $pagespec !~ /[\s*?()!]/) {
2060                 $depends_simple{$page}{lc $pagespec} |= $deptype;
2061                 return 1;
2062         }
2063
2064         # Add explicit dependencies for influences.
2065         my $sub=pagespec_translate($pagespec);
2066         return unless defined $sub;
2067         foreach my $p (keys %pagesources) {
2068                 my $r=$sub->($p, location => $page);
2069                 my $i=$r->influences;
2070                 my $static=$r->influences_static;
2071                 foreach my $k (keys %$i) {
2072                         next unless $r || $static || $k eq $page;
2073                         $depends_simple{$page}{lc $k} |= $i->{$k};
2074                 }
2075                 last if $static;
2076         }
2077
2078         $depends{$page}{$pagespec} |= $deptype;
2079         return 1;
2080 }
2081
2082 sub deptype (@) {
2083         my $deptype=0;
2084         foreach my $type (@_) {
2085                 if ($type eq 'presence') {
2086                         $deptype |= $DEPEND_PRESENCE;
2087                 }
2088                 elsif ($type eq 'links') { 
2089                         $deptype |= $DEPEND_LINKS;
2090                 }
2091                 elsif ($type eq 'content') {
2092                         $deptype |= $DEPEND_CONTENT;
2093                 }
2094         }
2095         return $deptype;
2096 }
2097
2098 my $file_prune_regexp;
2099 sub file_pruned ($) {
2100         my $file=shift;
2101
2102         if (defined $config{include} && length $config{include}) {
2103                 return 0 if $file =~ m/$config{include}/;
2104         }
2105
2106         if (! defined $file_prune_regexp) {
2107                 $file_prune_regexp='('.join('|', @{$config{wiki_file_prune_regexps}}).')';
2108                 $file_prune_regexp=qr/$file_prune_regexp/;
2109         }
2110         return $file =~ m/$file_prune_regexp/;
2111 }
2112
2113 sub define_gettext () {
2114         # If translation is needed, redefine the gettext function to do it.
2115         # Otherwise, it becomes a quick no-op.
2116         my $gettext_obj;
2117         my $getobj;
2118         if ((exists $ENV{LANG} && length $ENV{LANG}) ||
2119             (exists $ENV{LC_ALL} && length $ENV{LC_ALL}) ||
2120             (exists $ENV{LC_MESSAGES} && length $ENV{LC_MESSAGES})) {
2121                 $getobj=sub {
2122                         $gettext_obj=eval q{
2123                                 use Locale::gettext q{textdomain};
2124                                 Locale::gettext->domain('ikiwiki')
2125                         };
2126                 };
2127         }
2128
2129         no warnings 'redefine';
2130         *gettext=sub {
2131                 $getobj->() if $getobj;
2132                 if ($gettext_obj) {
2133                         $gettext_obj->get(shift);
2134                 }
2135                 else {
2136                         return shift;
2137                 }
2138         };
2139         *ngettext=sub {
2140                 $getobj->() if $getobj;
2141                 if ($gettext_obj) {
2142                         $gettext_obj->nget(@_);
2143                 }
2144                 else {
2145                         return ($_[2] == 1 ? $_[0] : $_[1])
2146                 }
2147         };
2148 }
2149
2150 sub gettext {
2151         define_gettext();
2152         gettext(@_);
2153 }
2154
2155 sub ngettext {
2156         define_gettext();
2157         ngettext(@_);
2158 }
2159
2160 sub yesno ($) {
2161         my $val=shift;
2162
2163         return (defined $val && (lc($val) eq gettext("yes") || lc($val) eq "yes" || $val eq "1"));
2164 }
2165
2166 sub inject {
2167         # Injects a new function into the symbol table to replace an
2168         # exported function.
2169         my %params=@_;
2170
2171         # This is deep ugly perl foo, beware.
2172         no strict;
2173         no warnings;
2174         if (! defined $params{parent}) {
2175                 $params{parent}='::';
2176                 $params{old}=\&{$params{name}};
2177                 $params{name}=~s/.*:://;
2178         }
2179         my $parent=$params{parent};
2180         foreach my $ns (grep /^\w+::/, keys %{$parent}) {
2181                 $ns = $params{parent} . $ns;
2182                 inject(%params, parent => $ns) unless $ns eq '::main::';
2183                 *{$ns . $params{name}} = $params{call}
2184                         if exists ${$ns}{$params{name}} &&
2185                            \&{${$ns}{$params{name}}} == $params{old};
2186         }
2187         use strict;
2188         use warnings;
2189 }
2190
2191 sub add_link ($$;$) {
2192         my $page=shift;
2193         my $link=shift;
2194         my $type=shift;
2195
2196         push @{$links{$page}}, $link
2197                 unless grep { $_ eq $link } @{$links{$page}};
2198
2199         if (defined $type) {
2200                 $typedlinks{$page}{$type}{$link} = 1;
2201         }
2202 }
2203
2204 sub add_autofile ($$$) {
2205         my $file=shift;
2206         my $plugin=shift;
2207         my $generator=shift;
2208         
2209         $autofiles{$file}{plugin}=$plugin;
2210         $autofiles{$file}{generator}=$generator;
2211 }
2212
2213 sub sortspec_translate ($$) {
2214         my $spec = shift;
2215         my $reverse = shift;
2216
2217         my $code = "";
2218         my @data;
2219         while ($spec =~ m{
2220                 \s*
2221                 (-?)            # group 1: perhaps negated
2222                 \s*
2223                 (               # group 2: a word
2224                         \w+\([^\)]*\)   # command(params)
2225                         |
2226                         [^\s]+          # or anything else
2227                 )
2228                 \s*
2229         }gx) {
2230                 my $negated = $1;
2231                 my $word = $2;
2232                 my $params = undef;
2233
2234                 if ($word =~ m/^(\w+)\((.*)\)$/) {
2235                         # command with parameters
2236                         $params = $2;
2237                         $word = $1;
2238                 }
2239                 elsif ($word !~ m/^\w+$/) {
2240                         error(sprintf(gettext("invalid sort type %s"), $word));
2241                 }
2242
2243                 if (length $code) {
2244                         $code .= " || ";
2245                 }
2246
2247                 if ($negated) {
2248                         $code .= "-";
2249                 }
2250
2251                 if (exists $IkiWiki::SortSpec::{"cmp_$word"}) {
2252                         if (defined $params) {
2253                                 push @data, $params;
2254                                 $code .= "IkiWiki::SortSpec::cmp_$word(\$data[$#data])";
2255                         }
2256                         else {
2257                                 $code .= "IkiWiki::SortSpec::cmp_$word(undef)";
2258                         }
2259                 }
2260                 else {
2261                         error(sprintf(gettext("unknown sort type %s"), $word));
2262                 }
2263         }
2264
2265         if (! length $code) {
2266                 # undefined sorting method... sort arbitrarily
2267                 return sub { 0 };
2268         }
2269
2270         if ($reverse) {
2271                 $code="-($code)";
2272         }
2273
2274         no warnings;
2275         return eval 'sub { '.$code.' }';
2276 }
2277
2278 sub pagespec_translate ($) {
2279         my $spec=shift;
2280
2281         # Convert spec to perl code.
2282         my $code="";
2283         my @data;
2284         while ($spec=~m{
2285                 \s*             # ignore whitespace
2286                 (               # 1: match a single word
2287                         \!              # !
2288                 |
2289                         \(              # (
2290                 |
2291                         \)              # )
2292                 |
2293                         \w+\([^\)]*\)   # command(params)
2294                 |
2295                         [^\s()]+        # any other text
2296                 )
2297                 \s*             # ignore whitespace
2298         }gx) {
2299                 my $word=$1;
2300                 if (lc $word eq 'and') {
2301                         $code.=' &';
2302                 }
2303                 elsif (lc $word eq 'or') {
2304                         $code.=' |';
2305                 }
2306                 elsif ($word eq "(" || $word eq ")" || $word eq "!") {
2307                         $code.=' '.$word;
2308                 }
2309                 elsif ($word =~ /^(\w+)\((.*)\)$/) {
2310                         if (exists $IkiWiki::PageSpec::{"match_$1"}) {
2311                                 push @data, $2;
2312                                 $code.="IkiWiki::PageSpec::match_$1(\$page, \$data[$#data], \@_)";
2313                         }
2314                         else {
2315                                 push @data, qq{unknown function in pagespec "$word"};
2316                                 $code.="IkiWiki::ErrorReason->new(\$data[$#data])";
2317                         }
2318                 }
2319                 else {
2320                         push @data, $word;
2321                         $code.=" IkiWiki::PageSpec::match_glob(\$page, \$data[$#data], \@_)";
2322                 }
2323         }
2324
2325         if (! length $code) {
2326                 $code="IkiWiki::FailReason->new('empty pagespec')";
2327         }
2328
2329         no warnings;
2330         return eval 'sub { my $page=shift; '.$code.' }';
2331 }
2332
2333 sub pagespec_match ($$;@) {
2334         my $page=shift;
2335         my $spec=shift;
2336         my @params=@_;
2337
2338         # Backwards compatability with old calling convention.
2339         if (@params == 1) {
2340                 unshift @params, 'location';
2341         }
2342
2343         my $sub=pagespec_translate($spec);
2344         return IkiWiki::ErrorReason->new("syntax error in pagespec \"$spec\"")
2345                 if ! defined $sub;
2346         return $sub->($page, @params);
2347 }
2348
2349 sub pagespec_match_list ($$;@) {
2350         my $page=shift;
2351         my $pagespec=shift;
2352         my %params=@_;
2353
2354         # Backwards compatability with old calling convention.
2355         if (ref $page) {
2356                 print STDERR "warning: a plugin (".caller().") is using pagespec_match_list in an obsolete way, and needs to be updated\n";
2357                 $params{list}=$page;
2358                 $page=$params{location}; # ugh!
2359         }
2360
2361         my $sub=pagespec_translate($pagespec);
2362         error "syntax error in pagespec \"$pagespec\""
2363                 if ! defined $sub;
2364         my $sort=sortspec_translate($params{sort}, $params{reverse})
2365                 if defined $params{sort};
2366
2367         my @candidates;
2368         if (exists $params{list}) {
2369                 @candidates=exists $params{filter}
2370                         ? grep { ! $params{filter}->($_) } @{$params{list}}
2371                         : @{$params{list}};
2372         }
2373         else {
2374                 @candidates=exists $params{filter}
2375                         ? grep { ! $params{filter}->($_) } keys %pagesources
2376                         : keys %pagesources;
2377         }
2378         
2379         # clear params, remainder is passed to pagespec
2380         $depends{$page}{$pagespec} |= ($params{deptype} || $DEPEND_CONTENT);
2381         my $num=$params{num};
2382         delete @params{qw{num deptype reverse sort filter list}};
2383         
2384         # when only the top matches will be returned, it's efficient to
2385         # sort before matching to pagespec,
2386         if (defined $num && defined $sort) {
2387                 @candidates=IkiWiki::SortSpec::sort_pages(
2388                         $sort, @candidates);
2389         }
2390         
2391         my @matches;
2392         my $firstfail;
2393         my $count=0;
2394         my $accum=IkiWiki::SuccessReason->new();
2395         foreach my $p (@candidates) {
2396                 my $r=$sub->($p, %params, location => $page);
2397                 error(sprintf(gettext("cannot match pages: %s"), $r))
2398                         if $r->isa("IkiWiki::ErrorReason");
2399                 unless ($r || $r->influences_static) {
2400                         $r->remove_influence($p);
2401                 }
2402                 $accum |= $r;
2403                 if ($r) {
2404                         push @matches, $p;
2405                         last if defined $num && ++$count == $num;
2406                 }
2407         }
2408
2409         # Add simple dependencies for accumulated influences.
2410         my $i=$accum->influences;
2411         foreach my $k (keys %$i) {
2412                 $depends_simple{$page}{lc $k} |= $i->{$k};
2413         }
2414
2415         # when all matches will be returned, it's efficient to
2416         # sort after matching
2417         if (! defined $num && defined $sort) {
2418                 return IkiWiki::SortSpec::sort_pages(
2419                         $sort, @matches);
2420         }
2421         else {
2422                 return @matches;
2423         }
2424 }
2425
2426 sub pagespec_valid ($) {
2427         my $spec=shift;
2428
2429         return defined pagespec_translate($spec);
2430 }
2431
2432 sub glob2re ($) {
2433         my $re=quotemeta(shift);
2434         $re=~s/\\\*/.*/g;
2435         $re=~s/\\\?/./g;
2436         return qr/^$re$/i;
2437 }
2438
2439 package IkiWiki::FailReason;
2440
2441 use overload (
2442         '""'    => sub { $_[0][0] },
2443         '0+'    => sub { 0 },
2444         '!'     => sub { bless $_[0], 'IkiWiki::SuccessReason'},
2445         '&'     => sub { $_[0]->merge_influences($_[1], 1); $_[0] },
2446         '|'     => sub { $_[1]->merge_influences($_[0]); $_[1] },
2447         fallback => 1,
2448 );
2449
2450 our @ISA = 'IkiWiki::SuccessReason';
2451
2452 package IkiWiki::SuccessReason;
2453
2454 use overload (
2455         '""'    => sub { $_[0][0] },
2456         '0+'    => sub { 1 },
2457         '!'     => sub { bless $_[0], 'IkiWiki::FailReason'},
2458         '&'     => sub { $_[1]->merge_influences($_[0], 1); $_[1] },
2459         '|'     => sub { $_[0]->merge_influences($_[1]); $_[0] },
2460         fallback => 1,
2461 );
2462
2463 sub new {
2464         my $class = shift;
2465         my $value = shift;
2466         return bless [$value, {@_}], $class;
2467 }
2468
2469 sub influences {
2470         my $this=shift;
2471         $this->[1]={@_} if @_;
2472         my %i=%{$this->[1]};
2473         delete $i{""};
2474         return \%i;
2475 }
2476
2477 sub influences_static {
2478         return ! $_[0][1]->{""};
2479 }
2480
2481 sub merge_influences {
2482         my $this=shift;
2483         my $other=shift;
2484         my $anded=shift;
2485
2486         if (! $anded || (($this || %{$this->[1]}) &&
2487                          ($other || %{$other->[1]}))) {
2488                 foreach my $influence (keys %{$other->[1]}) {
2489                         $this->[1]{$influence} |= $other->[1]{$influence};
2490                 }
2491         }
2492         else {
2493                 # influence blocker
2494                 $this->[1]={};
2495         }
2496 }
2497
2498 sub remove_influence {
2499         my $this=shift;
2500         my $torm=shift;
2501
2502         delete $this->[1]{$torm};
2503 }
2504
2505 package IkiWiki::ErrorReason;
2506
2507 our @ISA = 'IkiWiki::FailReason';
2508
2509 package IkiWiki::PageSpec;
2510
2511 sub derel ($$) {
2512         my $path=shift;
2513         my $from=shift;
2514
2515         if ($path =~ m!^\.(/|$)!) {
2516                 if ($1) {
2517                         $from=~s#/?[^/]+$## if defined $from;
2518                         $path=~s#^\./##;
2519                         $path="$from/$path" if defined $from && length $from;
2520                 }
2521                 else {
2522                         $path = $from;
2523                         $path = "" unless defined $path;
2524                 }
2525         }
2526
2527         return $path;
2528 }
2529
2530 my %glob_cache;
2531
2532 sub match_glob ($$;@) {
2533         my $page=shift;
2534         my $glob=shift;
2535         my %params=@_;
2536         
2537         $glob=derel($glob, $params{location});
2538
2539         # Instead of converting the glob to a regex every time,
2540         # cache the compiled regex to save time.
2541         my $re=$glob_cache{$glob};
2542         unless (defined $re) {
2543                 $glob_cache{$glob} = $re = IkiWiki::glob2re($glob);
2544         }
2545         if ($page =~ $re) {
2546                 if (! IkiWiki::isinternal($page) || $params{internal}) {
2547                         return IkiWiki::SuccessReason->new("$glob matches $page");
2548                 }
2549                 else {
2550                         return IkiWiki::FailReason->new("$glob matches $page, but the page is an internal page");
2551                 }
2552         }
2553         else {
2554                 return IkiWiki::FailReason->new("$glob does not match $page");
2555         }
2556 }
2557
2558 sub match_internal ($$;@) {
2559         return match_glob(shift, shift, @_, internal => 1)
2560 }
2561
2562 sub match_page ($$;@) {
2563         my $page=shift;
2564         my $match=match_glob($page, shift, @_);
2565         if ($match) {
2566                 my $source=exists $IkiWiki::pagesources{$page} ?
2567                         $IkiWiki::pagesources{$page} :
2568                         $IkiWiki::delpagesources{$page};
2569                 my $type=defined $source ? IkiWiki::pagetype($source) : undef;
2570                 if (! defined $type) {  
2571                         return IkiWiki::FailReason->new("$page is not a page");
2572                 }
2573         }
2574         return $match;
2575 }
2576
2577 sub match_link ($$;@) {
2578         my $page=shift;
2579         my $link=lc(shift);
2580         my %params=@_;
2581
2582         $link=derel($link, $params{location});
2583         my $from=exists $params{location} ? $params{location} : '';
2584         my $linktype=$params{linktype};
2585         my $qualifier='';
2586         if (defined $linktype) {
2587                 $qualifier=" with type $linktype";
2588         }
2589
2590         my $links = $IkiWiki::links{$page};
2591         return IkiWiki::FailReason->new("$page has no links", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2592                 unless $links && @{$links};
2593         my $bestlink = IkiWiki::bestlink($from, $link);
2594         foreach my $p (@{$links}) {
2595                 next unless (! defined $linktype || exists $IkiWiki::typedlinks{$page}{$linktype}{$p});
2596
2597                 if (length $bestlink) {
2598                         if ($bestlink eq IkiWiki::bestlink($page, $p)) {
2599                                 return IkiWiki::SuccessReason->new("$page links to $link$qualifier", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2600                         }
2601                 }
2602                 else {
2603                         if (match_glob($p, $link, %params)) {
2604                                 return IkiWiki::SuccessReason->new("$page links to page $p$qualifier, matching $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2605                         }
2606                         my ($p_rel)=$p=~/^\/?(.*)/;
2607                         $link=~s/^\///;
2608                         if (match_glob($p_rel, $link, %params)) {
2609                                 return IkiWiki::SuccessReason->new("$page links to page $p_rel$qualifier, matching $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2610                         }
2611                 }
2612         }
2613         return IkiWiki::FailReason->new("$page does not link to $link$qualifier", $page => $IkiWiki::DEPEND_LINKS, "" => 1);
2614 }
2615
2616 sub match_backlink ($$;@) {
2617         my $ret=match_link($_[1], $_[0], @_);
2618         $ret->influences($_[1] => $IkiWiki::DEPEND_LINKS);
2619         return $ret;
2620 }
2621
2622 sub match_created_before ($$;@) {
2623         my $page=shift;
2624         my $testpage=shift;
2625         my %params=@_;
2626         
2627         $testpage=derel($testpage, $params{location});
2628
2629         if (exists $IkiWiki::pagectime{$testpage}) {
2630                 if ($IkiWiki::pagectime{$page} < $IkiWiki::pagectime{$testpage}) {
2631                         return IkiWiki::SuccessReason->new("$page created before $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2632                 }
2633                 else {
2634                         return IkiWiki::FailReason->new("$page not created before $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2635                 }
2636         }
2637         else {
2638                 return IkiWiki::ErrorReason->new("$testpage does not exist", $testpage => $IkiWiki::DEPEND_PRESENCE);
2639         }
2640 }
2641
2642 sub match_created_after ($$;@) {
2643         my $page=shift;
2644         my $testpage=shift;
2645         my %params=@_;
2646         
2647         $testpage=derel($testpage, $params{location});
2648
2649         if (exists $IkiWiki::pagectime{$testpage}) {
2650                 if ($IkiWiki::pagectime{$page} > $IkiWiki::pagectime{$testpage}) {
2651                         return IkiWiki::SuccessReason->new("$page created after $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2652                 }
2653                 else {
2654                         return IkiWiki::FailReason->new("$page not created after $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2655                 }
2656         }
2657         else {
2658                 return IkiWiki::ErrorReason->new("$testpage does not exist", $testpage => $IkiWiki::DEPEND_PRESENCE);
2659         }
2660 }
2661
2662 sub match_creation_day ($$;@) {
2663         my $page=shift;
2664         my $d=shift;
2665         if ($d !~ /^\d+$/) {
2666                 return IkiWiki::ErrorReason->new("invalid day $d");
2667         }
2668         if ((localtime($IkiWiki::pagectime{$page}))[3] == $d) {
2669                 return IkiWiki::SuccessReason->new('creation_day matched');
2670         }
2671         else {
2672                 return IkiWiki::FailReason->new('creation_day did not match');
2673         }
2674 }
2675
2676 sub match_creation_month ($$;@) {
2677         my $page=shift;
2678         my $m=shift;
2679         if ($m !~ /^\d+$/) {
2680                 return IkiWiki::ErrorReason->new("invalid month $m");
2681         }
2682         if ((localtime($IkiWiki::pagectime{$page}))[4] + 1 == $m) {
2683                 return IkiWiki::SuccessReason->new('creation_month matched');
2684         }
2685         else {
2686                 return IkiWiki::FailReason->new('creation_month did not match');
2687         }
2688 }
2689
2690 sub match_creation_year ($$;@) {
2691         my $page=shift;
2692         my $y=shift;
2693         if ($y !~ /^\d+$/) {
2694                 return IkiWiki::ErrorReason->new("invalid year $y");
2695         }
2696         if ((localtime($IkiWiki::pagectime{$page}))[5] + 1900 == $y) {
2697                 return IkiWiki::SuccessReason->new('creation_year matched');
2698         }
2699         else {
2700                 return IkiWiki::FailReason->new('creation_year did not match');
2701         }
2702 }
2703
2704 sub match_user ($$;@) {
2705         shift;
2706         my $user=shift;
2707         my %params=@_;
2708         
2709         my $regexp=IkiWiki::glob2re($user);
2710         
2711         if (! exists $params{user}) {
2712                 return IkiWiki::ErrorReason->new("no user specified");
2713         }
2714
2715         if (defined $params{user} && $params{user}=~$regexp) {
2716                 return IkiWiki::SuccessReason->new("user is $user");
2717         }
2718         elsif (! defined $params{user}) {
2719                 return IkiWiki::FailReason->new("not logged in");
2720         }
2721         else {
2722                 return IkiWiki::FailReason->new("user is $params{user}, not $user");
2723         }
2724 }
2725
2726 sub match_admin ($$;@) {
2727         shift;
2728         shift;
2729         my %params=@_;
2730         
2731         if (! exists $params{user}) {
2732                 return IkiWiki::ErrorReason->new("no user specified");
2733         }
2734
2735         if (defined $params{user} && IkiWiki::is_admin($params{user})) {
2736                 return IkiWiki::SuccessReason->new("user is an admin");
2737         }
2738         elsif (! defined $params{user}) {
2739                 return IkiWiki::FailReason->new("not logged in");
2740         }
2741         else {
2742                 return IkiWiki::FailReason->new("user is not an admin");
2743         }
2744 }
2745
2746 sub match_ip ($$;@) {
2747         shift;
2748         my $ip=shift;
2749         my %params=@_;
2750         
2751         if (! exists $params{ip}) {
2752                 return IkiWiki::ErrorReason->new("no IP specified");
2753         }
2754
2755         if (defined $params{ip} && lc $params{ip} eq lc $ip) {
2756                 return IkiWiki::SuccessReason->new("IP is $ip");
2757         }
2758         else {
2759                 return IkiWiki::FailReason->new("IP is $params{ip}, not $ip");
2760         }
2761 }
2762
2763 package IkiWiki::SortSpec;
2764
2765 # This is in the SortSpec namespace so that the $a and $b that sort() uses
2766 # are easily available in this namespace, for cmp functions to use them.
2767 sub sort_pages {
2768         my $f=shift;
2769         sort $f @_
2770 }
2771
2772 sub cmp_title {
2773         IkiWiki::pagetitle(IkiWiki::basename($a))
2774         cmp
2775         IkiWiki::pagetitle(IkiWiki::basename($b))
2776 }
2777
2778 sub cmp_mtime { $IkiWiki::pagemtime{$b} <=> $IkiWiki::pagemtime{$a} }
2779 sub cmp_age { $IkiWiki::pagectime{$b} <=> $IkiWiki::pagectime{$a} }
2780
2781 1