Merge branch 'master' of git://git.ikiwiki.info
[ikiwiki.git] / IkiWiki.pm
1 #!/usr/bin/perl
2
3 package IkiWiki;
4
5 use warnings;
6 use strict;
7 use Encode;
8 use HTML::Entities;
9 use URI::Escape q{uri_escape_utf8};
10 use POSIX;
11 use Storable;
12 use open qw{:utf8 :std};
13
14 use vars qw{%config %links %oldlinks %pagemtime %pagectime %pagecase
15             %pagestate %wikistate %renderedfiles %oldrenderedfiles
16             %pagesources %destsources %depends %hooks %forcerebuild
17             $gettext_obj %loaded_plugins};
18
19 use Exporter q{import};
20 our @EXPORT = qw(hook debug error template htmlpage add_depends pagespec_match
21                  bestlink htmllink readfile writefile pagetype srcfile pagename
22                  displaytime will_render gettext urlto targetpage
23                  add_underlay pagetitle titlepage linkpage newpagefile
24                  inject
25                  %config %links %pagestate %wikistate %renderedfiles
26                  %pagesources %destsources);
27 our $VERSION = 2.00; # plugin interface version, next is ikiwiki version
28 our $version='unknown'; # VERSION_AUTOREPLACE done by Makefile, DNE
29 my $installdir=''; # INSTALLDIR_AUTOREPLACE done by Makefile, DNE
30
31 # Optimisation.
32 use Memoize;
33 memoize("abs2rel");
34 memoize("pagespec_translate");
35 memoize("file_pruned");
36
37 sub getsetup () { #{{{
38         wikiname => {
39                 type => "string",
40                 default => "wiki",
41                 description => "name of the wiki",
42                 safe => 1,
43                 rebuild => 1,
44         },
45         adminemail => {
46                 type => "string",
47                 default => undef,
48                 example => 'me@example.com',
49                 description => "contact email for wiki",
50                 safe => 1,
51                 rebuild => 0,
52         },
53         adminuser => {
54                 type => "string",
55                 default => [],
56                 description => "users who are wiki admins",
57                 safe => 1,
58                 rebuild => 0,
59         },
60         banned_users => {
61                 type => "string",
62                 default => [],
63                 description => "users who are banned from the wiki",
64                 safe => 1,
65                 rebuild => 0,
66         },
67         srcdir => {
68                 type => "string",
69                 default => undef,
70                 example => "$ENV{HOME}/wiki",
71                 description => "where the source of the wiki is located",
72                 safe => 0, # path
73                 rebuild => 1,
74         },
75         destdir => {
76                 type => "string",
77                 default => undef,
78                 example => "/var/www/wiki",
79                 description => "where to build the wiki",
80                 safe => 0, # path
81                 rebuild => 1,
82         },
83         url => {
84                 type => "string",
85                 default => '',
86                 example => "http://example.com/wiki",
87                 description => "base url to the wiki",
88                 safe => 1,
89                 rebuild => 1,
90         },
91         cgiurl => {
92                 type => "string",
93                 default => '',
94                 example => "http://example.com/wiki/ikiwiki.cgi",
95                 description => "url to the ikiwiki.cgi",
96                 safe => 1,
97                 rebuild => 1,
98         },
99         cgi_wrapper => {
100                 type => "string",
101                 default => '',
102                 example => "/var/www/wiki/ikiwiki.cgi",
103                 description => "cgi wrapper to generate",
104                 safe => 0, # file
105                 rebuild => 0,
106         },
107         cgi_wrappermode => {
108                 type => "string",
109                 default => '06755',
110                 description => "mode for cgi_wrapper (can safely be made suid)",
111                 safe => 0,
112                 rebuild => 0,
113         },
114         rcs => {
115                 type => "string",
116                 default => '',
117                 description => "rcs backend to use",
118                 safe => 0, # don't allow overriding
119                 rebuild => 0,
120         },
121         default_plugins => {
122                 type => "internal",
123                 default => [qw{mdwn link inline meta htmlscrubber passwordauth
124                                 openid signinedit lockedit conditional
125                                 recentchanges parentlinks editpage}],
126                 description => "plugins to enable by default",
127                 safe => 0,
128                 rebuild => 1,
129         },
130         add_plugins => {
131                 type => "string",
132                 default => [],
133                 description => "plugins to add to the default configuration",
134                 safe => 1,
135                 rebuild => 1,
136         },
137         disable_plugins => {
138                 type => "string",
139                 default => [],
140                 description => "plugins to disable",
141                 safe => 1,
142                 rebuild => 1,
143         },
144         templatedir => {
145                 type => "string",
146                 default => "$installdir/share/ikiwiki/templates",
147                 description => "location of template files",
148                 advanced => 1,
149                 safe => 0, # path
150                 rebuild => 1,
151         },
152         underlaydir => {
153                 type => "string",
154                 default => "$installdir/share/ikiwiki/basewiki",
155                 description => "base wiki source location",
156                 advanced => 1,
157                 safe => 0, # path
158                 rebuild => 0,
159         },
160         wrappers => {
161                 type => "internal",
162                 default => [],
163                 description => "wrappers to generate",
164                 safe => 0,
165                 rebuild => 0,
166         },
167         underlaydirs => {
168                 type => "internal",
169                 default => [],
170                 description => "additional underlays to use",
171                 safe => 0,
172                 rebuild => 0,
173         },
174         verbose => {
175                 type => "boolean",
176                 example => 1,
177                 description => "display verbose messages when building?",
178                 safe => 1,
179                 rebuild => 0,
180         },
181         syslog => {
182                 type => "boolean",
183                 example => 1,
184                 description => "log to syslog?",
185                 safe => 1,
186                 rebuild => 0,
187         },
188         usedirs => {
189                 type => "boolean",
190                 default => 1,
191                 description => "create output files named page/index.html?",
192                 safe => 0, # changing requires manual transition
193                 rebuild => 1,
194         },
195         prefix_directives => {
196                 type => "boolean",
197                 default => 0,
198                 description => "use '!'-prefixed preprocessor directives?",
199                 safe => 0, # changing requires manual transition
200                 rebuild => 1,
201         },
202         indexpages => {
203                 type => "boolean",
204                 default => 0,
205                 description => "use page/index.mdwn source files",
206                 safe => 1,
207                 rebuild => 1,
208         },
209         discussion => {
210                 type => "boolean",
211                 default => 1,
212                 description => "enable Discussion pages?",
213                 safe => 1,
214                 rebuild => 1,
215         },
216         sslcookie => {
217                 type => "boolean",
218                 default => 0,
219                 description => "only send cookies over SSL connections?",
220                 advanced => 1,
221                 safe => 1,
222                 rebuild => 0,
223         },
224         default_pageext => {
225                 type => "string",
226                 default => "mdwn",
227                 description => "extension to use for new pages",
228                 safe => 0, # not sanitized
229                 rebuild => 0,
230         },
231         htmlext => {
232                 type => "string",
233                 default => "html",
234                 description => "extension to use for html files",
235                 safe => 0, # not sanitized
236                 rebuild => 1,
237         },
238         timeformat => {
239                 type => "string",
240                 default => '%c',
241                 description => "strftime format string to display date",
242                 advanced => 1,
243                 safe => 1,
244                 rebuild => 1,
245         },
246         locale => {
247                 type => "string",
248                 default => undef,
249                 example => "en_US.UTF-8",
250                 description => "UTF-8 locale to use",
251                 advanced => 1,
252                 safe => 0,
253                 rebuild => 1,
254         },
255         userdir => {
256                 type => "string",
257                 default => "",
258                 example => "users",
259                 description => "put user pages below specified page",
260                 safe => 1,
261                 rebuild => 1,
262         },
263         numbacklinks => {
264                 type => "integer",
265                 default => 10,
266                 description => "how many backlinks to show before hiding excess (0 to show all)",
267                 safe => 1,
268                 rebuild => 1,
269         },
270         hardlink => {
271                 type => "boolean",
272                 default => 0,
273                 description => "attempt to hardlink source files? (optimisation for large files)",
274                 advanced => 1,
275                 safe => 0, # paranoia
276                 rebuild => 0,
277         },
278         umask => {
279                 type => "integer",
280                 description => "",
281                 example => "022",
282                 description => "force ikiwiki to use a particular umask",
283                 advanced => 1,
284                 safe => 0, # paranoia
285                 rebuild => 0,
286         },
287         libdir => {
288                 type => "string",
289                 default => "",
290                 example => "$ENV{HOME}/.ikiwiki/",
291                 description => "extra library and plugin directory",
292                 advanced => 1,
293                 safe => 0, # directory
294                 rebuild => 0,
295         },
296         ENV => {
297                 type => "string", 
298                 default => {},
299                 description => "environment variables",
300                 safe => 0, # paranoia
301                 rebuild => 0,
302         },
303         exclude => {
304                 type => "string",
305                 default => undef,
306                 example => '\.wav$',
307                 description => "regexp of source files to ignore",
308                 advanced => 1,
309                 safe => 0, # regexp
310                 rebuild => 1,
311         },
312         wiki_file_prune_regexps => {
313                 type => "internal",
314                 default => [qr/(^|\/)\.\.(\/|$)/, qr/^\./, qr/\/\./,
315                         qr/\.x?html?$/, qr/\.ikiwiki-new$/,
316                         qr/(^|\/).svn\//, qr/.arch-ids\//, qr/{arch}\//,
317                         qr/(^|\/)_MTN\//,
318                         qr/\.dpkg-tmp$/],
319                 description => "regexps of source files to ignore",
320                 safe => 0,
321                 rebuild => 1,
322         },
323         wiki_file_chars => {
324                 type => "string",
325                 description => "specifies the characters that are allowed in source filenames",
326                 default => "-[:alnum:]+/.:_",
327                 safe => 0,
328                 rebuild => 1,
329         },
330         wiki_file_regexp => {
331                 type => "internal",
332                 description => "regexp of legal source files",
333                 safe => 0,
334                 rebuild => 1,
335         },
336         web_commit_regexp => {
337                 type => "internal",
338                 default => qr/^web commit (by (.*?(?=: |$))|from (\d+\.\d+\.\d+\.\d+)):?(.*)/,
339                 description => "regexp to parse web commits from logs",
340                 safe => 0,
341                 rebuild => 0,
342         },
343         cgi => {
344                 type => "internal",
345                 default => 0,
346                 description => "run as a cgi",
347                 safe => 0,
348                 rebuild => 0,
349         },
350         cgi_disable_uploads => {
351                 type => "internal",
352                 default => 1,
353                 description => "whether CGI should accept file uploads",
354                 safe => 0,
355                 rebuild => 0,
356         },
357         post_commit => {
358                 type => "internal",
359                 default => 0,
360                 description => "run as a post-commit hook",
361                 safe => 0,
362                 rebuild => 0,
363         },
364         rebuild => {
365                 type => "internal",
366                 default => 0,
367                 description => "running in rebuild mode",
368                 safe => 0,
369                 rebuild => 0,
370         },
371         setup => {
372                 type => "internal",
373                 default => undef,
374                 description => "running in setup mode",
375                 safe => 0,
376                 rebuild => 0,
377         },
378         refresh => {
379                 type => "internal",
380                 default => 0,
381                 description => "running in refresh mode",
382                 safe => 0,
383                 rebuild => 0,
384         },
385         test_receive => {
386                 type => "internal",
387                 default => 0,
388                 description => "running in receive test mode",
389                 safe => 0,
390                 rebuild => 0,
391         },
392         getctime => {
393                 type => "internal",
394                 default => 0,
395                 description => "running in getctime mode",
396                 safe => 0,
397                 rebuild => 0,
398         },
399         w3mmode => {
400                 type => "internal",
401                 default => 0,
402                 description => "running in w3mmode",
403                 safe => 0,
404                 rebuild => 0,
405         },
406         wikistatedir => {
407                 type => "internal",
408                 default => undef,
409                 description => "path to the .ikiwiki directory holding ikiwiki state",
410                 safe => 0,
411                 rebuild => 0,
412         },
413         setupfile => {
414                 type => "internal",
415                 default => undef,
416                 description => "path to setup file",
417                 safe => 0,
418                 rebuild => 0,
419         },
420         allow_symlinks_before_srcdir => {
421                 type => "boolean",
422                 default => 0,
423                 description => "allow symlinks in the path leading to the srcdir (potentially insecure)",
424                 safe => 0,
425                 rebuild => 0,
426         },
427 } #}}}
428
429 sub defaultconfig () { #{{{
430         my %s=getsetup();
431         my @ret;
432         foreach my $key (keys %s) {
433                 push @ret, $key, $s{$key}->{default};
434         }
435         use Data::Dumper;
436         return @ret;
437 } #}}}
438
439 sub checkconfig () { #{{{
440         # locale stuff; avoid LC_ALL since it overrides everything
441         if (defined $ENV{LC_ALL}) {
442                 $ENV{LANG} = $ENV{LC_ALL};
443                 delete $ENV{LC_ALL};
444         }
445         if (defined $config{locale}) {
446                 if (POSIX::setlocale(&POSIX::LC_ALL, $config{locale})) {
447                         $ENV{LANG}=$config{locale};
448                         $gettext_obj=undef;
449                 }
450         }
451                 
452         if (! defined $config{wiki_file_regexp}) {
453                 $config{wiki_file_regexp}=qr/(^[$config{wiki_file_chars}]+$)/;
454         }
455
456         if (ref $config{ENV} eq 'HASH') {
457                 foreach my $val (keys %{$config{ENV}}) {
458                         $ENV{$val}=$config{ENV}{$val};
459                 }
460         }
461
462         if ($config{w3mmode}) {
463                 eval q{use Cwd q{abs_path}};
464                 error($@) if $@;
465                 $config{srcdir}=possibly_foolish_untaint(abs_path($config{srcdir}));
466                 $config{destdir}=possibly_foolish_untaint(abs_path($config{destdir}));
467                 $config{cgiurl}="file:///\$LIB/ikiwiki-w3m.cgi/".$config{cgiurl}
468                         unless $config{cgiurl} =~ m!file:///!;
469                 $config{url}="file://".$config{destdir};
470         }
471
472         if ($config{cgi} && ! length $config{url}) {
473                 error(gettext("Must specify url to wiki with --url when using --cgi"));
474         }
475         
476         $config{wikistatedir}="$config{srcdir}/.ikiwiki"
477                 unless exists $config{wikistatedir} && defined $config{wikistatedir};
478
479         if (defined $config{umask}) {
480                 umask(possibly_foolish_untaint($config{umask}));
481         }
482
483         run_hooks(checkconfig => sub { shift->() });
484
485         return 1;
486 } #}}}
487
488 sub listplugins () { #{{{
489         my %ret;
490
491         foreach my $dir (@INC, $config{libdir}) {
492                 next unless defined $dir && length $dir;
493                 foreach my $file (glob("$dir/IkiWiki/Plugin/*.pm")) {
494                         my ($plugin)=$file=~/.*\/(.*)\.pm$/;
495                         $ret{$plugin}=1;
496                 }
497         }
498         foreach my $dir ($config{libdir}, "$installdir/lib/ikiwiki") {
499                 next unless defined $dir && length $dir;
500                 foreach my $file (glob("$dir/plugins/*")) {
501                         $ret{basename($file)}=1 if -x $file;
502                 }
503         }
504
505         return keys %ret;
506 } #}}}
507
508 sub loadplugins () { #{{{
509         if (defined $config{libdir} && length $config{libdir}) {
510                 unshift @INC, possibly_foolish_untaint($config{libdir});
511         }
512
513         foreach my $plugin (@{$config{default_plugins}}, @{$config{add_plugins}}) {
514                 loadplugin($plugin);
515         }
516         
517         if ($config{rcs}) {
518                 if (exists $IkiWiki::hooks{rcs}) {
519                         error(gettext("cannot use multiple rcs plugins"));
520                 }
521                 loadplugin($config{rcs});
522         }
523         if (! exists $IkiWiki::hooks{rcs}) {
524                 loadplugin("norcs");
525         }
526
527         run_hooks(getopt => sub { shift->() });
528         if (grep /^-/, @ARGV) {
529                 print STDERR "Unknown option: $_\n"
530                         foreach grep /^-/, @ARGV;
531                 usage();
532         }
533
534         return 1;
535 } #}}}
536
537 sub loadplugin ($) { #{{{
538         my $plugin=shift;
539
540         return if grep { $_ eq $plugin} @{$config{disable_plugins}};
541
542         foreach my $dir (defined $config{libdir} ? possibly_foolish_untaint($config{libdir}) : undef,
543                          "$installdir/lib/ikiwiki") {
544                 if (defined $dir && -x "$dir/plugins/$plugin") {
545                         eval { require IkiWiki::Plugin::external };
546                         if ($@) {
547                                 my $reason=$@;
548                                 error(sprintf(gettext("failed to load external plugin needed for %s plugin: %s"), $plugin, $reason));
549                         }
550                         import IkiWiki::Plugin::external "$dir/plugins/$plugin";
551                         $loaded_plugins{$plugin}=1;
552                         return 1;
553                 }
554         }
555
556         my $mod="IkiWiki::Plugin::".possibly_foolish_untaint($plugin);
557         eval qq{use $mod};
558         if ($@) {
559                 error("Failed to load plugin $mod: $@");
560         }
561         $loaded_plugins{$plugin}=1;
562         return 1;
563 } #}}}
564
565 sub error ($;$) { #{{{
566         my $message=shift;
567         my $cleaner=shift;
568         log_message('err' => $message) if $config{syslog};
569         if (defined $cleaner) {
570                 $cleaner->();
571         }
572         die $message."\n";
573 } #}}}
574
575 sub debug ($) { #{{{
576         return unless $config{verbose};
577         return log_message(debug => @_);
578 } #}}}
579
580 my $log_open=0;
581 sub log_message ($$) { #{{{
582         my $type=shift;
583
584         if ($config{syslog}) {
585                 require Sys::Syslog;
586                 if (! $log_open) {
587                         Sys::Syslog::setlogsock('unix');
588                         Sys::Syslog::openlog('ikiwiki', '', 'user');
589                         $log_open=1;
590                 }
591                 return eval {
592                         Sys::Syslog::syslog($type, "[$config{wikiname}] %s", join(" ", @_));
593                 };
594         }
595         elsif (! $config{cgi}) {
596                 return print "@_\n";
597         }
598         else {
599                 return print STDERR "@_\n";
600         }
601 } #}}}
602
603 sub possibly_foolish_untaint ($) { #{{{
604         my $tainted=shift;
605         my ($untainted)=$tainted=~/(.*)/s;
606         return $untainted;
607 } #}}}
608
609 sub basename ($) { #{{{
610         my $file=shift;
611
612         $file=~s!.*/+!!;
613         return $file;
614 } #}}}
615
616 sub dirname ($) { #{{{
617         my $file=shift;
618
619         $file=~s!/*[^/]+$!!;
620         return $file;
621 } #}}}
622
623 sub pagetype ($) { #{{{
624         my $page=shift;
625         
626         if ($page =~ /\.([^.]+)$/) {
627                 return $1 if exists $hooks{htmlize}{$1};
628         }
629         return;
630 } #}}}
631
632 sub isinternal ($) { #{{{
633         my $page=shift;
634         return exists $pagesources{$page} &&
635                 $pagesources{$page} =~ /\._([^.]+)$/;
636 } #}}}
637
638 sub pagename ($) { #{{{
639         my $file=shift;
640
641         my $type=pagetype($file);
642         my $page=$file;
643         $page=~s/\Q.$type\E*$// if defined $type && !$hooks{htmlize}{$type}{keepextension};
644         if ($config{indexpages} && $page=~/(.*)\/index$/) {
645                 $page=$1;
646         }
647         return $page;
648 } #}}}
649
650 sub newpagefile ($$) { #{{{
651         my $page=shift;
652         my $type=shift;
653
654         if (! $config{indexpages} || $page eq 'index') {
655                 return $page.".".$type;
656         }
657         else {
658                 return $page."/index.".$type;
659         }
660 } #}}}
661
662 sub targetpage ($$) { #{{{
663         my $page=shift;
664         my $ext=shift;
665         
666         if (! $config{usedirs} || $page eq 'index') {
667                 return $page.".".$ext;
668         }
669         else {
670                 return $page."/index.".$ext;
671         }
672 } #}}}
673
674 sub htmlpage ($) { #{{{
675         my $page=shift;
676         
677         return targetpage($page, $config{htmlext});
678 } #}}}
679
680 sub srcfile_stat { #{{{
681         my $file=shift;
682         my $nothrow=shift;
683
684         return "$config{srcdir}/$file", stat(_) if -e "$config{srcdir}/$file";
685         foreach my $dir (@{$config{underlaydirs}}, $config{underlaydir}) {
686                 return "$dir/$file", stat(_) if -e "$dir/$file";
687         }
688         error("internal error: $file cannot be found in $config{srcdir} or underlay") unless $nothrow;
689         return;
690 } #}}}
691
692 sub srcfile ($;$) { #{{{
693         return (srcfile_stat(@_))[0];
694 } #}}}
695
696 sub add_underlay ($) { #{{{
697         my $dir=shift;
698
699         if ($dir !~ /^\//) {
700                 $dir="$config{underlaydir}/../$dir";
701         }
702
703         if (! grep { $_ eq $dir } @{$config{underlaydirs}}) {
704                 unshift @{$config{underlaydirs}}, $dir;
705         }
706
707         return 1;
708 } #}}}
709
710 sub readfile ($;$$) { #{{{
711         my $file=shift;
712         my $binary=shift;
713         my $wantfd=shift;
714
715         if (-l $file) {
716                 error("cannot read a symlink ($file)");
717         }
718         
719         local $/=undef;
720         open (my $in, "<", $file) || error("failed to read $file: $!");
721         binmode($in) if ($binary);
722         return \*$in if $wantfd;
723         my $ret=<$in>;
724         close $in || error("failed to read $file: $!");
725         return $ret;
726 } #}}}
727
728 sub prep_writefile ($$) { #{{{
729         my $file=shift;
730         my $destdir=shift;
731         
732         my $test=$file;
733         while (length $test) {
734                 if (-l "$destdir/$test") {
735                         error("cannot write to a symlink ($test)");
736                 }
737                 $test=dirname($test);
738         }
739
740         my $dir=dirname("$destdir/$file");
741         if (! -d $dir) {
742                 my $d="";
743                 foreach my $s (split(m!/+!, $dir)) {
744                         $d.="$s/";
745                         if (! -d $d) {
746                                 mkdir($d) || error("failed to create directory $d: $!");
747                         }
748                 }
749         }
750
751         return 1;
752 } #}}}
753
754 sub writefile ($$$;$$) { #{{{
755         my $file=shift; # can include subdirs
756         my $destdir=shift; # directory to put file in
757         my $content=shift;
758         my $binary=shift;
759         my $writer=shift;
760         
761         prep_writefile($file, $destdir);
762         
763         my $newfile="$destdir/$file.ikiwiki-new";
764         if (-l $newfile) {
765                 error("cannot write to a symlink ($newfile)");
766         }
767         
768         my $cleanup = sub { unlink($newfile) };
769         open (my $out, '>', $newfile) || error("failed to write $newfile: $!", $cleanup);
770         binmode($out) if ($binary);
771         if ($writer) {
772                 $writer->(\*$out, $cleanup);
773         }
774         else {
775                 print $out $content or error("failed writing to $newfile: $!", $cleanup);
776         }
777         close $out || error("failed saving $newfile: $!", $cleanup);
778         rename($newfile, "$destdir/$file") || 
779                 error("failed renaming $newfile to $destdir/$file: $!", $cleanup);
780
781         return 1;
782 } #}}}
783
784 my %cleared;
785 sub will_render ($$;$) { #{{{
786         my $page=shift;
787         my $dest=shift;
788         my $clear=shift;
789
790         # Important security check.
791         if (-e "$config{destdir}/$dest" && ! $config{rebuild} &&
792             ! grep { $_ eq $dest } (@{$renderedfiles{$page}}, @{$oldrenderedfiles{$page}}, @{$wikistate{editpage}{previews}})) {
793                 error("$config{destdir}/$dest independently created, not overwriting with version from $page");
794         }
795
796         if (! $clear || $cleared{$page}) {
797                 $renderedfiles{$page}=[$dest, grep { $_ ne $dest } @{$renderedfiles{$page}}];
798         }
799         else {
800                 foreach my $old (@{$renderedfiles{$page}}) {
801                         delete $destsources{$old};
802                 }
803                 $renderedfiles{$page}=[$dest];
804                 $cleared{$page}=1;
805         }
806         $destsources{$dest}=$page;
807
808         return 1;
809 } #}}}
810
811 sub bestlink ($$) { #{{{
812         my $page=shift;
813         my $link=shift;
814         
815         my $cwd=$page;
816         if ($link=~s/^\/+//) {
817                 # absolute links
818                 $cwd="";
819         }
820         $link=~s/\/$//;
821
822         do {
823                 my $l=$cwd;
824                 $l.="/" if length $l;
825                 $l.=$link;
826
827                 if (exists $links{$l}) {
828                         return $l;
829                 }
830                 elsif (exists $pagecase{lc $l}) {
831                         return $pagecase{lc $l};
832                 }
833         } while $cwd=~s{/?[^/]+$}{};
834
835         if (length $config{userdir}) {
836                 my $l = "$config{userdir}/".lc($link);
837                 if (exists $links{$l}) {
838                         return $l;
839                 }
840                 elsif (exists $pagecase{lc $l}) {
841                         return $pagecase{lc $l};
842                 }
843         }
844
845         #print STDERR "warning: page $page, broken link: $link\n";
846         return "";
847 } #}}}
848
849 sub isinlinableimage ($) { #{{{
850         my $file=shift;
851         
852         return $file =~ /\.(png|gif|jpg|jpeg)$/i;
853 } #}}}
854
855 sub pagetitle ($;$) { #{{{
856         my $page=shift;
857         my $unescaped=shift;
858
859         if ($unescaped) {
860                 $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : chr($2)/eg;
861         }
862         else {
863                 $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : "&#$2;"/eg;
864         }
865
866         return $page;
867 } #}}}
868
869 sub titlepage ($) { #{{{
870         my $title=shift;
871         # support use w/o %config set
872         my $chars = defined $config{wiki_file_chars} ? $config{wiki_file_chars} : "-[:alnum:]+/.:_";
873         $title=~s/([^$chars]|_)/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
874         return $title;
875 } #}}}
876
877 sub linkpage ($) { #{{{
878         my $link=shift;
879         my $chars = defined $config{wiki_file_chars} ? $config{wiki_file_chars} : "-[:alnum:]+/.:_";
880         $link=~s/([^$chars])/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
881         return $link;
882 } #}}}
883
884 sub cgiurl (@) { #{{{
885         my %params=@_;
886
887         return $config{cgiurl}."?".
888                 join("&amp;", map $_."=".uri_escape_utf8($params{$_}), keys %params);
889 } #}}}
890
891 sub baseurl (;$) { #{{{
892         my $page=shift;
893
894         return "$config{url}/" if ! defined $page;
895         
896         $page=htmlpage($page);
897         $page=~s/[^\/]+$//;
898         $page=~s/[^\/]+\//..\//g;
899         return $page;
900 } #}}}
901
902 sub abs2rel ($$) { #{{{
903         # Work around very innefficient behavior in File::Spec if abs2rel
904         # is passed two relative paths. It's much faster if paths are
905         # absolute! (Debian bug #376658; fixed in debian unstable now)
906         my $path="/".shift;
907         my $base="/".shift;
908
909         require File::Spec;
910         my $ret=File::Spec->abs2rel($path, $base);
911         $ret=~s/^// if defined $ret;
912         return $ret;
913 } #}}}
914
915 sub displaytime ($;$) { #{{{
916         # Plugins can override this function to mark up the time to
917         # display.
918         return '<span class="date">'.formattime(@_).'</span>';
919 } #}}}
920
921 sub formattime ($;$) { #{{{
922         # Plugins can override this function to format the time.
923         my $time=shift;
924         my $format=shift;
925         if (! defined $format) {
926                 $format=$config{timeformat};
927         }
928
929         # strftime doesn't know about encodings, so make sure
930         # its output is properly treated as utf8
931         return decode_utf8(POSIX::strftime($format, localtime($time)));
932 } #}}}
933
934 sub beautify_urlpath ($) { #{{{
935         my $url=shift;
936
937         if ($config{usedirs}) {
938                 $url =~ s!/index.$config{htmlext}$!/!;
939         }
940
941         # Ensure url is not an empty link, and
942         # if it's relative, make that explicit to avoid colon confusion.
943         if ($url !~ /^\//) {
944                 $url="./$url";
945         }
946
947         return $url;
948 } #}}}
949
950 sub urlto ($$;$) { #{{{
951         my $to=shift;
952         my $from=shift;
953         my $absolute=shift;
954         
955         if (! length $to) {
956                 return beautify_urlpath(baseurl($from)."index.$config{htmlext}");
957         }
958
959         if (! $destsources{$to}) {
960                 $to=htmlpage($to);
961         }
962
963         if ($absolute) {
964                 return $config{url}.beautify_urlpath("/".$to);
965         }
966
967         my $link = abs2rel($to, dirname(htmlpage($from)));
968
969         return beautify_urlpath($link);
970 } #}}}
971
972 sub htmllink ($$$;@) { #{{{
973         my $lpage=shift; # the page doing the linking
974         my $page=shift; # the page that will contain the link (different for inline)
975         my $link=shift;
976         my %opts=@_;
977
978         $link=~s/\/$//;
979
980         my $bestlink;
981         if (! $opts{forcesubpage}) {
982                 $bestlink=bestlink($lpage, $link);
983         }
984         else {
985                 $bestlink="$lpage/".lc($link);
986         }
987
988         my $linktext;
989         if (defined $opts{linktext}) {
990                 $linktext=$opts{linktext};
991         }
992         else {
993                 $linktext=pagetitle(basename($link));
994         }
995         
996         return "<span class=\"selflink\">$linktext</span>"
997                 if length $bestlink && $page eq $bestlink &&
998                    ! defined $opts{anchor};
999         
1000         if (! $destsources{$bestlink}) {
1001                 $bestlink=htmlpage($bestlink);
1002
1003                 if (! $destsources{$bestlink}) {
1004                         return $linktext unless length $config{cgiurl};
1005                         return "<span class=\"createlink\"><a href=\"".
1006                                 cgiurl(
1007                                         do => "create",
1008                                         page => lc($link),
1009                                         from => $lpage
1010                                 ).
1011                                 "\" rel=\"nofollow\">?</a>$linktext</span>"
1012                 }
1013         }
1014         
1015         $bestlink=abs2rel($bestlink, dirname(htmlpage($page)));
1016         $bestlink=beautify_urlpath($bestlink);
1017         
1018         if (! $opts{noimageinline} && isinlinableimage($bestlink)) {
1019                 return "<img src=\"$bestlink\" alt=\"$linktext\" />";
1020         }
1021
1022         if (defined $opts{anchor}) {
1023                 $bestlink.="#".$opts{anchor};
1024         }
1025
1026         my @attrs;
1027         if (defined $opts{rel}) {
1028                 push @attrs, ' rel="'.$opts{rel}.'"';
1029         }
1030         if (defined $opts{class}) {
1031                 push @attrs, ' class="'.$opts{class}.'"';
1032         }
1033
1034         return "<a href=\"$bestlink\"@attrs>$linktext</a>";
1035 } #}}}
1036
1037 sub userlink ($) { #{{{
1038         my $user=shift;
1039
1040         my $oiduser=eval { openiduser($user) };
1041         if (defined $oiduser) {
1042                 return "<a href=\"$user\">$oiduser</a>";
1043         }
1044         else {
1045                 eval q{use CGI 'escapeHTML'};
1046                 error($@) if $@;
1047
1048                 return htmllink("", "", escapeHTML(
1049                         length $config{userdir} ? $config{userdir}."/".$user : $user
1050                 ), noimageinline => 1);
1051         }
1052 } #}}}
1053
1054 sub htmlize ($$$$) { #{{{
1055         my $page=shift;
1056         my $destpage=shift;
1057         my $type=shift;
1058         my $content=shift;
1059         
1060         my $oneline = $content !~ /\n/;
1061
1062         if (exists $hooks{htmlize}{$type}) {
1063                 $content=$hooks{htmlize}{$type}{call}->(
1064                         page => $page,
1065                         content => $content,
1066                 );
1067         }
1068         else {
1069                 error("htmlization of $type not supported");
1070         }
1071
1072         run_hooks(sanitize => sub {
1073                 $content=shift->(
1074                         page => $page,
1075                         destpage => $destpage,
1076                         content => $content,
1077                 );
1078         });
1079         
1080         if ($oneline) {
1081                 # hack to get rid of enclosing junk added by markdown
1082                 # and other htmlizers
1083                 $content=~s/^<p>//i;
1084                 $content=~s/<\/p>$//i;
1085                 chomp $content;
1086         }
1087
1088         return $content;
1089 } #}}}
1090
1091 sub linkify ($$$) { #{{{
1092         my $page=shift;
1093         my $destpage=shift;
1094         my $content=shift;
1095
1096         run_hooks(linkify => sub {
1097                 $content=shift->(
1098                         page => $page,
1099                         destpage => $destpage,
1100                         content => $content,
1101                 );
1102         });
1103         
1104         return $content;
1105 } #}}}
1106
1107 our %preprocessing;
1108 our $preprocess_preview=0;
1109 sub preprocess ($$$;$$) { #{{{
1110         my $page=shift; # the page the data comes from
1111         my $destpage=shift; # the page the data will appear in (different for inline)
1112         my $content=shift;
1113         my $scan=shift;
1114         my $preview=shift;
1115
1116         # Using local because it needs to be set within any nested calls
1117         # of this function.
1118         local $preprocess_preview=$preview if defined $preview;
1119
1120         my $handle=sub {
1121                 my $escape=shift;
1122                 my $prefix=shift;
1123                 my $command=shift;
1124                 my $params=shift;
1125                 $params="" if ! defined $params;
1126
1127                 if (length $escape) {
1128                         return "[[$prefix$command $params]]";
1129                 }
1130                 elsif (exists $hooks{preprocess}{$command}) {
1131                         return "" if $scan && ! $hooks{preprocess}{$command}{scan};
1132                         # Note: preserve order of params, some plugins may
1133                         # consider it significant.
1134                         my @params;
1135                         while ($params =~ m{
1136                                 (?:([-\w]+)=)?          # 1: named parameter key?
1137                                 (?:
1138                                         """(.*?)"""     # 2: triple-quoted value
1139                                 |
1140                                         "([^"]+)"       # 3: single-quoted value
1141                                 |
1142                                         (\S+)           # 4: unquoted value
1143                                 )
1144                                 (?:\s+|$)               # delimiter to next param
1145                         }sgx) {
1146                                 my $key=$1;
1147                                 my $val;
1148                                 if (defined $2) {
1149                                         $val=$2;
1150                                         $val=~s/\r\n/\n/mg;
1151                                         $val=~s/^\n+//g;
1152                                         $val=~s/\n+$//g;
1153                                 }
1154                                 elsif (defined $3) {
1155                                         $val=$3;
1156                                 }
1157                                 elsif (defined $4) {
1158                                         $val=$4;
1159                                 }
1160
1161                                 if (defined $key) {
1162                                         push @params, $key, $val;
1163                                 }
1164                                 else {
1165                                         push @params, $val, '';
1166                                 }
1167                         }
1168                         if ($preprocessing{$page}++ > 3) {
1169                                 # Avoid loops of preprocessed pages preprocessing
1170                                 # other pages that preprocess them, etc.
1171                                 return "[[!$command <span class=\"error\">".
1172                                         sprintf(gettext("preprocessing loop detected on %s at depth %i"),
1173                                                 $page, $preprocessing{$page}).
1174                                         "</span>]]";
1175                         }
1176                         my $ret;
1177                         if (! $scan) {
1178                                 $ret=eval {
1179                                         $hooks{preprocess}{$command}{call}->(
1180                                                 @params,
1181                                                 page => $page,
1182                                                 destpage => $destpage,
1183                                                 preview => $preprocess_preview,
1184                                         );
1185                                 };
1186                                 if ($@) {
1187                                         chomp $@;
1188                                         $ret="[[!$command <span class=\"error\">".
1189                                                 gettext("Error").": $@"."</span>]]";
1190                                 }
1191                         }
1192                         else {
1193                                 # use void context during scan pass
1194                                 eval {
1195                                         $hooks{preprocess}{$command}{call}->(
1196                                                 @params,
1197                                                 page => $page,
1198                                                 destpage => $destpage,
1199                                                 preview => $preprocess_preview,
1200                                         );
1201                                 };
1202                                 $ret="";
1203                         }
1204                         $preprocessing{$page}--;
1205                         return $ret;
1206                 }
1207                 else {
1208                         return "[[$prefix$command $params]]";
1209                 }
1210         };
1211         
1212         my $regex;
1213         if ($config{prefix_directives}) {
1214                 $regex = qr{
1215                         (\\?)           # 1: escape?
1216                         \[\[(!)         # directive open; 2: prefix
1217                         ([-\w]+)        # 3: command
1218                         (               # 4: the parameters..
1219                                 \s+     # Must have space if parameters present
1220                                 (?:
1221                                         (?:[-\w]+=)?            # named parameter key?
1222                                         (?:
1223                                                 """.*?"""       # triple-quoted value
1224                                                 |
1225                                                 "[^"]+"         # single-quoted value
1226                                                 |
1227                                                 [^\s\]]+        # unquoted value
1228                                         )
1229                                         \s*                     # whitespace or end
1230                                                                 # of directive
1231                                 )
1232                         *)?             # 0 or more parameters
1233                         \]\]            # directive closed
1234                 }sx;
1235         }
1236         else {
1237                 $regex = qr{
1238                         (\\?)           # 1: escape?
1239                         \[\[(!?)        # directive open; 2: optional prefix
1240                         ([-\w]+)        # 3: command
1241                         \s+
1242                         (               # 4: the parameters..
1243                                 (?:
1244                                         (?:[-\w]+=)?            # named parameter key?
1245                                         (?:
1246                                                 """.*?"""       # triple-quoted value
1247                                                 |
1248                                                 "[^"]+"         # single-quoted value
1249                                                 |
1250                                                 [^\s\]]+        # unquoted value
1251                                         )
1252                                         \s*                     # whitespace or end
1253                                                                 # of directive
1254                                 )
1255                         *)              # 0 or more parameters
1256                         \]\]            # directive closed
1257                 }sx;
1258         }
1259
1260         $content =~ s{$regex}{$handle->($1, $2, $3, $4)}eg;
1261         return $content;
1262 } #}}}
1263
1264 sub filter ($$$) { #{{{
1265         my $page=shift;
1266         my $destpage=shift;
1267         my $content=shift;
1268
1269         run_hooks(filter => sub {
1270                 $content=shift->(page => $page, destpage => $destpage, 
1271                         content => $content);
1272         });
1273
1274         return $content;
1275 } #}}}
1276
1277 sub indexlink () { #{{{
1278         return "<a href=\"$config{url}\">$config{wikiname}</a>";
1279 } #}}}
1280
1281 my $wikilock;
1282
1283 sub lockwiki (;$) { #{{{
1284         my $wait=@_ ? shift : 1;
1285         # Take an exclusive lock on the wiki to prevent multiple concurrent
1286         # run issues. The lock will be dropped on program exit.
1287         if (! -d $config{wikistatedir}) {
1288                 mkdir($config{wikistatedir});
1289         }
1290         open($wikilock, '>', "$config{wikistatedir}/lockfile") ||
1291                 error ("cannot write to $config{wikistatedir}/lockfile: $!");
1292         if (! flock($wikilock, 2 | 4)) { # LOCK_EX | LOCK_NB
1293                 if ($wait) {
1294                         debug("wiki seems to be locked, waiting for lock");
1295                         my $wait=600; # arbitrary, but don't hang forever to 
1296                                       # prevent process pileup
1297                         for (1..$wait) {
1298                                 return if flock($wikilock, 2 | 4);
1299                                 sleep 1;
1300                         }
1301                         error("wiki is locked; waited $wait seconds without lock being freed (possible stuck process or stale lock?)");
1302                 }
1303                 else {
1304                         return 0;
1305                 }
1306         }
1307         return 1;
1308 } #}}}
1309
1310 sub unlockwiki () { #{{{
1311         return close($wikilock) if $wikilock;
1312         return;
1313 } #}}}
1314
1315 my $commitlock;
1316
1317 sub commit_hook_enabled () { #{{{
1318         open($commitlock, '+>', "$config{wikistatedir}/commitlock") ||
1319                 error("cannot write to $config{wikistatedir}/commitlock: $!");
1320         if (! flock($commitlock, 1 | 4)) { # LOCK_SH | LOCK_NB to test
1321                 close($commitlock) || error("failed closing commitlock: $!");
1322                 return 0;
1323         }
1324         close($commitlock) || error("failed closing commitlock: $!");
1325         return 1;
1326 } #}}}
1327
1328 sub disable_commit_hook () { #{{{
1329         open($commitlock, '>', "$config{wikistatedir}/commitlock") ||
1330                 error("cannot write to $config{wikistatedir}/commitlock: $!");
1331         if (! flock($commitlock, 2)) { # LOCK_EX
1332                 error("failed to get commit lock");
1333         }
1334         return 1;
1335 } #}}}
1336
1337 sub enable_commit_hook () { #{{{
1338         return close($commitlock) if $commitlock;
1339         return;
1340 } #}}}
1341
1342 sub loadindex () { #{{{
1343         %oldrenderedfiles=%pagectime=();
1344         if (! $config{rebuild}) {
1345                 %pagesources=%pagemtime=%oldlinks=%links=%depends=
1346                 %destsources=%renderedfiles=%pagecase=%pagestate=();
1347         }
1348         my $in;
1349         if (! open ($in, "<", "$config{wikistatedir}/indexdb")) {
1350                 if (-e "$config{wikistatedir}/index") {
1351                         system("ikiwiki-transition", "indexdb", $config{srcdir});
1352                         open ($in, "<", "$config{wikistatedir}/indexdb") || return;
1353                 }
1354                 else {
1355                         return;
1356                 }
1357         }
1358
1359         my $index=Storable::fd_retrieve($in);
1360         if (! defined $index) {
1361                 return 0;
1362         }
1363
1364         my $pages;
1365         if (exists $index->{version} && ! ref $index->{version}) {
1366                 $pages=$index->{page};
1367                 %wikistate=%{$index->{state}};
1368         }
1369         else {
1370                 $pages=$index;
1371                 %wikistate=();
1372         }
1373
1374         foreach my $src (keys %$pages) {
1375                 my $d=$pages->{$src};
1376                 my $page=pagename($src);
1377                 $pagectime{$page}=$d->{ctime};
1378                 if (! $config{rebuild}) {
1379                         $pagesources{$page}=$src;
1380                         $pagemtime{$page}=$d->{mtime};
1381                         $renderedfiles{$page}=$d->{dest};
1382                         if (exists $d->{links} && ref $d->{links}) {
1383                                 $links{$page}=$d->{links};
1384                                 $oldlinks{$page}=[@{$d->{links}}];
1385                         }
1386                         if (exists $d->{depends}) {
1387                                 $depends{$page}=$d->{depends};
1388                         }
1389                         if (exists $d->{state}) {
1390                                 $pagestate{$page}=$d->{state};
1391                         }
1392                 }
1393                 $oldrenderedfiles{$page}=[@{$d->{dest}}];
1394         }
1395         foreach my $page (keys %pagesources) {
1396                 $pagecase{lc $page}=$page;
1397         }
1398         foreach my $page (keys %renderedfiles) {
1399                 $destsources{$_}=$page foreach @{$renderedfiles{$page}};
1400         }
1401         return close($in);
1402 } #}}}
1403
1404 sub saveindex () { #{{{
1405         run_hooks(savestate => sub { shift->() });
1406
1407         my %hookids;
1408         foreach my $type (keys %hooks) {
1409                 $hookids{$_}=1 foreach keys %{$hooks{$type}};
1410         }
1411         my @hookids=keys %hookids;
1412
1413         if (! -d $config{wikistatedir}) {
1414                 mkdir($config{wikistatedir});
1415         }
1416         my $newfile="$config{wikistatedir}/indexdb.new";
1417         my $cleanup = sub { unlink($newfile) };
1418         open (my $out, '>', $newfile) || error("cannot write to $newfile: $!", $cleanup);
1419
1420         my %index;
1421         foreach my $page (keys %pagemtime) {
1422                 next unless $pagemtime{$page};
1423                 my $src=$pagesources{$page};
1424
1425                 $index{page}{$src}={
1426                         ctime => $pagectime{$page},
1427                         mtime => $pagemtime{$page},
1428                         dest => $renderedfiles{$page},
1429                         links => $links{$page},
1430                 };
1431
1432                 if (exists $depends{$page}) {
1433                         $index{page}{$src}{depends} = $depends{$page};
1434                 }
1435
1436                 if (exists $pagestate{$page}) {
1437                         foreach my $id (@hookids) {
1438                                 foreach my $key (keys %{$pagestate{$page}{$id}}) {
1439                                         $index{page}{$src}{state}{$id}{$key}=$pagestate{$page}{$id}{$key};
1440                                 }
1441                         }
1442                 }
1443         }
1444
1445         $index{state}={};
1446         foreach my $id (@hookids) {
1447                 foreach my $key (keys %{$wikistate{$id}}) {
1448                         $index{state}{$id}{$key}=$wikistate{$id}{$key};
1449                 }
1450         }
1451         
1452         $index{version}="3";
1453         my $ret=Storable::nstore_fd(\%index, $out);
1454         return if ! defined $ret || ! $ret;
1455         close $out || error("failed saving to $newfile: $!", $cleanup);
1456         rename($newfile, "$config{wikistatedir}/indexdb") ||
1457                 error("failed renaming $newfile to $config{wikistatedir}/indexdb", $cleanup);
1458         
1459         return 1;
1460 } #}}}
1461
1462 sub template_file ($) { #{{{
1463         my $template=shift;
1464
1465         foreach my $dir ($config{templatedir}, "$installdir/share/ikiwiki/templates") {
1466                 return "$dir/$template" if -e "$dir/$template";
1467         }
1468         return;
1469 } #}}}
1470
1471 sub template_params (@) { #{{{
1472         my $filename=template_file(shift);
1473
1474         if (! defined $filename) {
1475                 return if wantarray;
1476                 return "";
1477         }
1478
1479         my @ret=(
1480                 filter => sub {
1481                         my $text_ref = shift;
1482                         ${$text_ref} = decode_utf8(${$text_ref});
1483                 },
1484                 filename => $filename,
1485                 loop_context_vars => 1,
1486                 die_on_bad_params => 0,
1487                 @_
1488         );
1489         return wantarray ? @ret : {@ret};
1490 } #}}}
1491
1492 sub template ($;@) { #{{{
1493         require HTML::Template;
1494         return HTML::Template->new(template_params(@_));
1495 } #}}}
1496
1497 sub misctemplate ($$;@) { #{{{
1498         my $title=shift;
1499         my $pagebody=shift;
1500         
1501         my $template=template("misc.tmpl");
1502         $template->param(
1503                 title => $title,
1504                 indexlink => indexlink(),
1505                 wikiname => $config{wikiname},
1506                 pagebody => $pagebody,
1507                 baseurl => baseurl(),
1508                 @_,
1509         );
1510         run_hooks(pagetemplate => sub {
1511                 shift->(page => "", destpage => "", template => $template);
1512         });
1513         return $template->output;
1514 }#}}}
1515
1516 sub hook (@) { # {{{
1517         my %param=@_;
1518         
1519         if (! exists $param{type} || ! ref $param{call} || ! exists $param{id}) {
1520                 error 'hook requires type, call, and id parameters';
1521         }
1522
1523         return if $param{no_override} && exists $hooks{$param{type}}{$param{id}};
1524         
1525         $hooks{$param{type}}{$param{id}}=\%param;
1526         return 1;
1527 } # }}}
1528
1529 sub run_hooks ($$) { # {{{
1530         # Calls the given sub for each hook of the given type,
1531         # passing it the hook function to call.
1532         my $type=shift;
1533         my $sub=shift;
1534
1535         if (exists $hooks{$type}) {
1536                 my @deferred;
1537                 foreach my $id (keys %{$hooks{$type}}) {
1538                         if ($hooks{$type}{$id}{last}) {
1539                                 push @deferred, $id;
1540                                 next;
1541                         }
1542                         $sub->($hooks{$type}{$id}{call});
1543                 }
1544                 foreach my $id (@deferred) {
1545                         $sub->($hooks{$type}{$id}{call});
1546                 }
1547         }
1548
1549         return 1;
1550 } #}}}
1551
1552 sub rcs_update () { #{{{
1553         $hooks{rcs}{rcs_update}{call}->(@_);
1554 } #}}}
1555
1556 sub rcs_prepedit ($) { #{{{
1557         $hooks{rcs}{rcs_prepedit}{call}->(@_);
1558 } #}}}
1559
1560 sub rcs_commit ($$$;$$) { #{{{
1561         $hooks{rcs}{rcs_commit}{call}->(@_);
1562 } #}}}
1563
1564 sub rcs_commit_staged ($$$) { #{{{
1565         $hooks{rcs}{rcs_commit_staged}{call}->(@_);
1566 } #}}}
1567
1568 sub rcs_add ($) { #{{{
1569         $hooks{rcs}{rcs_add}{call}->(@_);
1570 } #}}}
1571
1572 sub rcs_remove ($) { #{{{
1573         $hooks{rcs}{rcs_remove}{call}->(@_);
1574 } #}}}
1575
1576 sub rcs_rename ($$) { #{{{
1577         $hooks{rcs}{rcs_rename}{call}->(@_);
1578 } #}}}
1579
1580 sub rcs_recentchanges ($) { #{{{
1581         $hooks{rcs}{rcs_recentchanges}{call}->(@_);
1582 } #}}}
1583
1584 sub rcs_diff ($) { #{{{
1585         $hooks{rcs}{rcs_diff}{call}->(@_);
1586 } #}}}
1587
1588 sub rcs_getctime ($) { #{{{
1589         $hooks{rcs}{rcs_getctime}{call}->(@_);
1590 } #}}}
1591
1592 sub rcs_receive () { #{{{
1593         $hooks{rcs}{rcs_receive}{call}->();
1594 } #}}}
1595
1596 sub globlist_to_pagespec ($) { #{{{
1597         my @globlist=split(' ', shift);
1598
1599         my (@spec, @skip);
1600         foreach my $glob (@globlist) {
1601                 if ($glob=~/^!(.*)/) {
1602                         push @skip, $glob;
1603                 }
1604                 else {
1605                         push @spec, $glob;
1606                 }
1607         }
1608
1609         my $spec=join(' or ', @spec);
1610         if (@skip) {
1611                 my $skip=join(' and ', @skip);
1612                 if (length $spec) {
1613                         $spec="$skip and ($spec)";
1614                 }
1615                 else {
1616                         $spec=$skip;
1617                 }
1618         }
1619         return $spec;
1620 } #}}}
1621
1622 sub is_globlist ($) { #{{{
1623         my $s=shift;
1624         return ( $s =~ /[^\s]+\s+([^\s]+)/ && $1 ne "and" && $1 ne "or" );
1625 } #}}}
1626
1627 sub safequote ($) { #{{{
1628         my $s=shift;
1629         $s=~s/[{}]//g;
1630         return "q{$s}";
1631 } #}}}
1632
1633 sub add_depends ($$) { #{{{
1634         my $page=shift;
1635         my $pagespec=shift;
1636         
1637         return unless pagespec_valid($pagespec);
1638
1639         if (! exists $depends{$page}) {
1640                 $depends{$page}=$pagespec;
1641         }
1642         else {
1643                 $depends{$page}=pagespec_merge($depends{$page}, $pagespec);
1644         }
1645
1646         return 1;
1647 } # }}}
1648
1649 sub file_pruned ($$) { #{{{
1650         require File::Spec;
1651         my $file=File::Spec->canonpath(shift);
1652         my $base=File::Spec->canonpath(shift);
1653         $file =~ s#^\Q$base\E/+##;
1654
1655         my $regexp='('.join('|', @{$config{wiki_file_prune_regexps}}).')';
1656         return $file =~ m/$regexp/ && $file ne $base;
1657 } #}}}
1658
1659 sub gettext { #{{{
1660         # Only use gettext in the rare cases it's needed.
1661         if ((exists $ENV{LANG} && length $ENV{LANG}) ||
1662             (exists $ENV{LC_ALL} && length $ENV{LC_ALL}) ||
1663             (exists $ENV{LC_MESSAGES} && length $ENV{LC_MESSAGES})) {
1664                 if (! $gettext_obj) {
1665                         $gettext_obj=eval q{
1666                                 use Locale::gettext q{textdomain};
1667                                 Locale::gettext->domain('ikiwiki')
1668                         };
1669                         if ($@) {
1670                                 print STDERR "$@";
1671                                 $gettext_obj=undef;
1672                                 return shift;
1673                         }
1674                 }
1675                 return $gettext_obj->get(shift);
1676         }
1677         else {
1678                 return shift;
1679         }
1680 } #}}}
1681
1682 sub yesno ($) { #{{{
1683         my $val=shift;
1684
1685         return (defined $val && lc($val) eq gettext("yes"));
1686 } #}}}
1687
1688 sub inject { #{{{
1689         # Injects a new function into the symbol table to replace an
1690         # exported function.
1691         my %params=@_;
1692
1693         # This is deep ugly perl foo, beware.
1694         no strict;
1695         no warnings;
1696         if (! defined $params{parent}) {
1697                 $params{parent}='::';
1698                 $params{old}=\&{$params{name}};
1699                 $params{name}=~s/.*:://;
1700         }
1701         my $parent=$params{parent};
1702         foreach my $ns (grep /^\w+::/, keys %{$parent}) {
1703                 $ns = $params{parent} . $ns;
1704                 inject(%params, parent => $ns) unless $ns eq '::main::';
1705                 *{$ns . $params{name}} = $params{call}
1706                         if exists ${$ns}{$params{name}} &&
1707                            \&{${$ns}{$params{name}}} == $params{old};
1708         }
1709         use strict;
1710         use warnings;
1711 } #}}}
1712
1713 sub pagespec_merge ($$) { #{{{
1714         my $a=shift;
1715         my $b=shift;
1716
1717         return $a if $a eq $b;
1718
1719         # Support for old-style GlobLists.
1720         if (is_globlist($a)) {
1721                 $a=globlist_to_pagespec($a);
1722         }
1723         if (is_globlist($b)) {
1724                 $b=globlist_to_pagespec($b);
1725         }
1726
1727         return "($a) or ($b)";
1728 } #}}}
1729
1730 sub pagespec_translate ($) { #{{{
1731         my $spec=shift;
1732
1733         # Support for old-style GlobLists.
1734         if (is_globlist($spec)) {
1735                 $spec=globlist_to_pagespec($spec);
1736         }
1737
1738         # Convert spec to perl code.
1739         my $code="";
1740         while ($spec=~m{
1741                 \s*             # ignore whitespace
1742                 (               # 1: match a single word
1743                         \!              # !
1744                 |
1745                         \(              # (
1746                 |
1747                         \)              # )
1748                 |
1749                         \w+\([^\)]*\)   # command(params)
1750                 |
1751                         [^\s()]+        # any other text
1752                 )
1753                 \s*             # ignore whitespace
1754         }igx) {
1755                 my $word=$1;
1756                 if (lc $word eq 'and') {
1757                         $code.=' &&';
1758                 }
1759                 elsif (lc $word eq 'or') {
1760                         $code.=' ||';
1761                 }
1762                 elsif ($word eq "(" || $word eq ")" || $word eq "!") {
1763                         $code.=' '.$word;
1764                 }
1765                 elsif ($word =~ /^(\w+)\((.*)\)$/) {
1766                         if (exists $IkiWiki::PageSpec::{"match_$1"}) {
1767                                 $code.="IkiWiki::PageSpec::match_$1(\$page, ".safequote($2).", \@_)";
1768                         }
1769                         else {
1770                                 $code.=' 0';
1771                         }
1772                 }
1773                 else {
1774                         $code.=" IkiWiki::PageSpec::match_glob(\$page, ".safequote($word).", \@_)";
1775                 }
1776         }
1777
1778         if (! length $code) {
1779                 $code=0;
1780         }
1781
1782         no warnings;
1783         return eval 'sub { my $page=shift; '.$code.' }';
1784 } #}}}
1785
1786 sub pagespec_match ($$;@) { #{{{
1787         my $page=shift;
1788         my $spec=shift;
1789         my @params=@_;
1790
1791         # Backwards compatability with old calling convention.
1792         if (@params == 1) {
1793                 unshift @params, 'location';
1794         }
1795
1796         my $sub=pagespec_translate($spec);
1797         return IkiWiki::FailReason->new("syntax error in pagespec \"$spec\"") if $@;
1798         return $sub->($page, @params);
1799 } #}}}
1800
1801 sub pagespec_valid ($) { #{{{
1802         my $spec=shift;
1803
1804         my $sub=pagespec_translate($spec);
1805         return ! $@;
1806 } #}}}
1807
1808 sub glob2re ($) { #{{{
1809         my $re=quotemeta(shift);
1810         $re=~s/\\\*/.*/g;
1811         $re=~s/\\\?/./g;
1812         return $re;
1813 } #}}}
1814
1815 package IkiWiki::FailReason;
1816
1817 use overload ( #{{{
1818         '""'    => sub { ${$_[0]} },
1819         '0+'    => sub { 0 },
1820         '!'     => sub { bless $_[0], 'IkiWiki::SuccessReason'},
1821         fallback => 1,
1822 ); #}}}
1823
1824 sub new { #{{{
1825         my $class = shift;
1826         my $value = shift;
1827         return bless \$value, $class;
1828 } #}}}
1829
1830 package IkiWiki::SuccessReason;
1831
1832 use overload ( #{{{
1833         '""'    => sub { ${$_[0]} },
1834         '0+'    => sub { 1 },
1835         '!'     => sub { bless $_[0], 'IkiWiki::FailReason'},
1836         fallback => 1,
1837 ); #}}}
1838
1839 sub new { #{{{
1840         my $class = shift;
1841         my $value = shift;
1842         return bless \$value, $class;
1843 }; #}}}
1844
1845 package IkiWiki::PageSpec;
1846
1847 sub match_glob ($$;@) { #{{{
1848         my $page=shift;
1849         my $glob=shift;
1850         my %params=@_;
1851         
1852         my $from=exists $params{location} ? $params{location} : '';
1853         
1854         # relative matching
1855         if ($glob =~ m!^\./!) {
1856                 $from=~s#/?[^/]+$##;
1857                 $glob=~s#^\./##;
1858                 $glob="$from/$glob" if length $from;
1859         }
1860
1861         my $regexp=IkiWiki::glob2re($glob);
1862         if ($page=~/^$regexp$/i) {
1863                 if (! IkiWiki::isinternal($page) || $params{internal}) {
1864                         return IkiWiki::SuccessReason->new("$glob matches $page");
1865                 }
1866                 else {
1867                         return IkiWiki::FailReason->new("$glob matches $page, but the page is an internal page");
1868                 }
1869         }
1870         else {
1871                 return IkiWiki::FailReason->new("$glob does not match $page");
1872         }
1873 } #}}}
1874
1875 sub match_internal ($$;@) { #{{{
1876         return match_glob($_[0], $_[1], @_, internal => 1)
1877 } #}}}
1878
1879 sub match_link ($$;@) { #{{{
1880         my $page=shift;
1881         my $link=lc(shift);
1882         my %params=@_;
1883
1884         my $from=exists $params{location} ? $params{location} : '';
1885
1886         # relative matching
1887         if ($link =~ m!^\.! && defined $from) {
1888                 $from=~s#/?[^/]+$##;
1889                 $link=~s#^\./##;
1890                 $link="$from/$link" if length $from;
1891         }
1892
1893         my $links = $IkiWiki::links{$page};
1894         return IkiWiki::FailReason->new("$page has no links") unless $links && @{$links};
1895         my $bestlink = IkiWiki::bestlink($from, $link);
1896         foreach my $p (@{$links}) {
1897                 if (length $bestlink) {
1898                         return IkiWiki::SuccessReason->new("$page links to $link")
1899                                 if $bestlink eq IkiWiki::bestlink($page, $p);
1900                 }
1901                 else {
1902                         return IkiWiki::SuccessReason->new("$page links to page $p matching $link")
1903                                 if match_glob($p, $link, %params);
1904                         $p=~s/^\///;
1905                         $link=~s/^\///;
1906                         return IkiWiki::SuccessReason->new("$page links to page $p matching $link")
1907                                 if match_glob($p, $link, %params);
1908                 }
1909         }
1910         return IkiWiki::FailReason->new("$page does not link to $link");
1911 } #}}}
1912
1913 sub match_backlink ($$;@) { #{{{
1914         return match_link($_[1], $_[0], @_);
1915 } #}}}
1916
1917 sub match_created_before ($$;@) { #{{{
1918         my $page=shift;
1919         my $testpage=shift;
1920
1921         if (exists $IkiWiki::pagectime{$testpage}) {
1922                 if ($IkiWiki::pagectime{$page} < $IkiWiki::pagectime{$testpage}) {
1923                         return IkiWiki::SuccessReason->new("$page created before $testpage");
1924                 }
1925                 else {
1926                         return IkiWiki::FailReason->new("$page not created before $testpage");
1927                 }
1928         }
1929         else {
1930                 return IkiWiki::FailReason->new("$testpage has no ctime");
1931         }
1932 } #}}}
1933
1934 sub match_created_after ($$;@) { #{{{
1935         my $page=shift;
1936         my $testpage=shift;
1937
1938         if (exists $IkiWiki::pagectime{$testpage}) {
1939                 if ($IkiWiki::pagectime{$page} > $IkiWiki::pagectime{$testpage}) {
1940                         return IkiWiki::SuccessReason->new("$page created after $testpage");
1941                 }
1942                 else {
1943                         return IkiWiki::FailReason->new("$page not created after $testpage");
1944                 }
1945         }
1946         else {
1947                 return IkiWiki::FailReason->new("$testpage has no ctime");
1948         }
1949 } #}}}
1950
1951 sub match_creation_day ($$;@) { #{{{
1952         if ((gmtime($IkiWiki::pagectime{shift()}))[3] == shift) {
1953                 return IkiWiki::SuccessReason->new('creation_day matched');
1954         }
1955         else {
1956                 return IkiWiki::FailReason->new('creation_day did not match');
1957         }
1958 } #}}}
1959
1960 sub match_creation_month ($$;@) { #{{{
1961         if ((gmtime($IkiWiki::pagectime{shift()}))[4] + 1 == shift) {
1962                 return IkiWiki::SuccessReason->new('creation_month matched');
1963         }
1964         else {
1965                 return IkiWiki::FailReason->new('creation_month did not match');
1966         }
1967 } #}}}
1968
1969 sub match_creation_year ($$;@) { #{{{
1970         if ((gmtime($IkiWiki::pagectime{shift()}))[5] + 1900 == shift) {
1971                 return IkiWiki::SuccessReason->new('creation_year matched');
1972         }
1973         else {
1974                 return IkiWiki::FailReason->new('creation_year did not match');
1975         }
1976 } #}}}
1977
1978 sub match_user ($$;@) { #{{{
1979         shift;
1980         my $user=shift;
1981         my %params=@_;
1982         
1983         if (! exists $params{user}) {
1984                 return IkiWiki::FailReason->new("no user specified");
1985         }
1986
1987         if (defined $params{user} && lc $params{user} eq lc $user) {
1988                 return IkiWiki::SuccessReason->new("user is $user");
1989         }
1990         elsif (! defined $params{user}) {
1991                 return IkiWiki::FailReason->new("not logged in");
1992         }
1993         else {
1994                 return IkiWiki::FailReason->new("user is $params{user}, not $user");
1995         }
1996 } #}}}
1997
1998 sub match_admin ($$;@) { #{{{
1999         shift;
2000         shift;
2001         my %params=@_;
2002         
2003         if (! exists $params{user}) {
2004                 return IkiWiki::FailReason->new("no user specified");
2005         }
2006
2007         if (defined $params{user} && IkiWiki::is_admin($params{user})) {
2008                 return IkiWiki::SuccessReason->new("user is an admin");
2009         }
2010         elsif (! defined $params{user}) {
2011                 return IkiWiki::FailReason->new("not logged in");
2012         }
2013         else {
2014                 return IkiWiki::FailReason->new("user is not an admin");
2015         }
2016 } #}}}
2017
2018 sub match_ip ($$;@) { #{{{
2019         shift;
2020         my $ip=shift;
2021         my %params=@_;
2022         
2023         if (! exists $params{ip}) {
2024                 return IkiWiki::FailReason->new("no IP specified");
2025         }
2026
2027         if (defined $params{ip} && lc $params{ip} eq lc $ip) {
2028                 return IkiWiki::SuccessReason->new("IP is $ip");
2029         }
2030         else {
2031                 return IkiWiki::FailReason->new("IP is $params{ip}, not $ip");
2032         }
2033 } #}}}
2034
2035 1