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