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