IkiWiki.pm

   1 #!/usr/bin/perl
   2
   3 package IkiWiki;
   4 use warnings;
   5 use strict;
   6 use Encode;
   7 use HTML::Entities;
   8 use URI::Escape q{uri_escape_utf8};
   9 use POSIX;
  10 use open qw{:utf8 :std};
  11
  12 use vars qw{%config %links %oldlinks %pagemtime %pagectime %pagecase
  13             %pagestate %renderedfiles %oldrenderedfiles %pagesources
  14             %destsources %depends %hooks %forcerebuild $gettext_obj};
  15
  16 use Exporter q{import};
  17 our @EXPORT = qw(hook debug error template htmlpage add_depends pagespec_match
  18                  bestlink htmllink readfile writefile pagetype srcfile pagename
  19                  displaytime will_render gettext urlto targetpage
  20                  add_underlay
  21                  %config %links %pagestate %renderedfiles
  22                  %pagesources %destsources);
  23 our $VERSION = 2.00; # plugin interface version, next is ikiwiki version
  24 our $version='unknown'; # VERSION_AUTOREPLACE done by Makefile, DNE
  25 my $installdir=''; # INSTALLDIR_AUTOREPLACE done by Makefile, DNE
  26
  27 # Optimisation.
  28 use Memoize;
  29 memoize("abs2rel");
  30 memoize("pagespec_translate");
  31 memoize("file_pruned");
  32
  33 sub defaultconfig () { #{{{
  34         return
  35         wiki_file_prune_regexps => [qr/(^|\/)\.\.(\/|$)/, qr/^\./, qr/\/\./,
  36                 qr/\.x?html?$/, qr/\.ikiwiki-new$/,
  37                 qr/(^|\/).svn\//, qr/.arch-ids\//, qr/{arch}\//,
  38                 qr/(^|\/)_MTN\//,
  39                 qr/\.dpkg-tmp$/],
  40         wiki_file_regexp => qr/(^[-[:alnum:]_.:\/+]+$)/,
  41         web_commit_regexp => qr/^web commit (by (.*?(?=: |$))|from (\d+\.\d+\.\d+\.\d+)):?(.*)/,
  42         verbose => 0,
  43         syslog => 0,
  44         wikiname => "wiki",
  45         default_pageext => "mdwn",
  46         htmlext => "html",
  47         cgi => 0,
  48         post_commit => 0,
  49         rcs => '',
  50         url => '',
  51         cgiurl => '',
  52         historyurl => '',
  53         diffurl => '',
  54         rss => 0,
  55         atom => 0,
  56         allowrss => 0,
  57         allowatom => 0,
  58         discussion => 1,
  59         rebuild => 0,
  60         refresh => 0,
  61         getctime => 0,
  62         w3mmode => 0,
  63         wrapper => undef,
  64         wrappermode => undef,
  65         svnpath => "trunk",
  66         gitorigin_branch => "origin",
  67         gitmaster_branch => "master",
  68         srcdir => undef,
  69         destdir => undef,
  70         pingurl => [],
  71         templatedir => "$installdir/share/ikiwiki/templates",
  72         underlaydir => "$installdir/share/ikiwiki/basewiki",
  73         underlaydirs => [],
  74         setup => undef,
  75         adminuser => undef,
  76         adminemail => undef,
  77         plugin => [qw{mdwn link inline htmlscrubber passwordauth openid
  78                         signinedit lockedit conditional recentchanges}],
  79         libdir => undef,
  80         timeformat => '%c',
  81         locale => undef,
  82         sslcookie => 0,
  83         httpauth => 0,
  84         userdir => "",
  85         usedirs => 1,
  86         numbacklinks => 10,
  87         account_creation_password => "",
  88         prefix_directives => 0,
  89 } #}}}
  90
  91 sub checkconfig () { #{{{
  92         # locale stuff; avoid LC_ALL since it overrides everything
  93         if (defined $ENV{LC_ALL}) {
  94                 $ENV{LANG} = $ENV{LC_ALL};
  95                 delete $ENV{LC_ALL};
  96         }
  97         if (defined $config{locale}) {
  98                 if (POSIX::setlocale(&POSIX::LC_ALL, $config{locale})) {
  99                         $ENV{LANG}=$config{locale};
 100                         $gettext_obj=undef;
 101                 }
 102         }
 103
 104         if ($config{w3mmode}) {
 105                 eval q{use Cwd q{abs_path}};
 106                 error($@) if $@;
 107                 $config{srcdir}=possibly_foolish_untaint(abs_path($config{srcdir}));
 108                 $config{destdir}=possibly_foolish_untaint(abs_path($config{destdir}));
 109                 $config{cgiurl}="file:///\$LIB/ikiwiki-w3m.cgi/".$config{cgiurl}
 110                         unless $config{cgiurl} =~ m!file:///!;
 111                 $config{url}="file://".$config{destdir};
 112         }
 113
 114         if ($config{cgi} && ! length $config{url}) {
 115                 error(gettext("Must specify url to wiki with --url when using --cgi"));
 116         }
 117
 118         $config{wikistatedir}="$config{srcdir}/.ikiwiki"
 119                 unless exists $config{wikistatedir};
 120
 121         if ($config{rcs}) {
 122                 eval qq{use IkiWiki::Rcs::$config{rcs}};
 123                 if ($@) {
 124                         error("Failed to load RCS module IkiWiki::Rcs::$config{rcs}: $@");
 125                 }
 126         }
 127         else {
 128                 require IkiWiki::Rcs::Stub;
 129         }
 130
 131         if (exists $config{umask}) {
 132                 umask(possibly_foolish_untaint($config{umask}));
 133         }
 134
 135         run_hooks(checkconfig => sub { shift->() });
 136
 137         return 1;
 138 } #}}}
 139
 140 sub loadplugins () { #{{{
 141         if (defined $config{libdir}) {
 142                 unshift @INC, possibly_foolish_untaint($config{libdir});
 143         }
 144
 145         loadplugin($_) foreach @{$config{plugin}};
 146
 147         run_hooks(getopt => sub { shift->() });
 148         if (grep /^-/, @ARGV) {
 149                 print STDERR "Unknown option: $_\n"
 150                         foreach grep /^-/, @ARGV;
 151                 usage();
 152         }
 153
 154         return 1;
 155 } #}}}
 156
 157 sub loadplugin ($) { #{{{
 158         my $plugin=shift;
 159
 160         return if grep { $_ eq $plugin} @{$config{disable_plugins}};
 161
 162         foreach my $dir (defined $config{libdir} ? possibly_foolish_untaint($config{libdir}) : undef,
 163                          "$installdir/lib/ikiwiki") {
 164                 if (defined $dir && -x "$dir/plugins/$plugin") {
 165                         require IkiWiki::Plugin::external;
 166                         import IkiWiki::Plugin::external "$dir/plugins/$plugin";
 167                         return 1;
 168                 }
 169         }
 170
 171         my $mod="IkiWiki::Plugin::".possibly_foolish_untaint($plugin);
 172         eval qq{use $mod};
 173         if ($@) {
 174                 error("Failed to load plugin $mod: $@");
 175         }
 176         return 1;
 177 } #}}}
 178
 179 sub error ($;$) { #{{{
 180         my $message=shift;
 181         my $cleaner=shift;
 182         if ($config{cgi}) {
 183                 print "Content-type: text/html\n\n";
 184                 print misctemplate(gettext("Error"),
 185                         "<p>".gettext("Error").": $message</p>");
 186         }
 187         log_message('err' => $message) if $config{syslog};
 188         if (defined $cleaner) {
 189                 $cleaner->();
 190         }
 191         die $message."\n";
 192 } #}}}
 193
 194 sub debug ($) { #{{{
 195         return unless $config{verbose};
 196         return log_message(debug => @_);
 197 } #}}}
 198
 199 my $log_open=0;
 200 sub log_message ($$) { #{{{
 201         my $type=shift;
 202
 203         if ($config{syslog}) {
 204                 require Sys::Syslog;
 205                 if (! $log_open) {
 206                         Sys::Syslog::setlogsock('unix');
 207                         Sys::Syslog::openlog('ikiwiki', '', 'user');
 208                         $log_open=1;
 209                 }
 210                 return eval {
 211                         Sys::Syslog::syslog($type, "[$config{wikiname}] %s", join(" ", @_));
 212                 };
 213         }
 214         elsif (! $config{cgi}) {
 215                 return print "@_\n";
 216         }
 217         else {
 218                 return print STDERR "@_\n";
 219         }
 220 } #}}}
 221
 222 sub possibly_foolish_untaint ($) { #{{{
 223         my $tainted=shift;
 224         my ($untainted)=$tainted=~/(.*)/s;
 225         return $untainted;
 226 } #}}}
 227
 228 sub basename ($) { #{{{
 229         my $file=shift;
 230
 231         $file=~s!.*/+!!;
 232         return $file;
 233 } #}}}
 234
 235 sub dirname ($) { #{{{
 236         my $file=shift;
 237
 238         $file=~s!/*[^/]+$!!;
 239         return $file;
 240 } #}}}
 241
 242 sub pagetype ($) { #{{{
 243         my $page=shift;
 244
 245         if ($page =~ /\.([^.]+)$/) {
 246                 return $1 if exists $hooks{htmlize}{$1};
 247         }
 248         return;
 249 } #}}}
 250
 251 sub isinternal ($) { #{{{
 252         my $page=shift;
 253         return exists $pagesources{$page} &&
 254                 $pagesources{$page} =~ /\._([^.]+)$/;
 255 } #}}}
 256
 257 sub pagename ($) { #{{{
 258         my $file=shift;
 259
 260         my $type=pagetype($file);
 261         my $page=$file;
 262         $page=~s/\Q.$type\E*$// if defined $type;
 263         return $page;
 264 } #}}}
 265
 266 sub targetpage ($$) { #{{{
 267         my $page=shift;
 268         my $ext=shift;
 269
 270         if (! $config{usedirs} || $page =~ /^index$/ ) {
 271                 return $page.".".$ext;
 272         } else {
 273                 return $page."/index.".$ext;
 274         }
 275 } #}}}
 276
 277 sub htmlpage ($) { #{{{
 278         my $page=shift;
 279
 280         return targetpage($page, $config{htmlext});
 281 } #}}}
 282
 283 sub srcfile ($) { #{{{
 284         my $file=shift;
 285
 286         return "$config{srcdir}/$file" if -e "$config{srcdir}/$file";
 287         foreach my $dir (@{$config{underlaydirs}}, $config{underlaydir}) {
 288                 return "$dir/$file" if -e "$dir/$file";
 289         }
 290         error("internal error: $file cannot be found in $config{srcdir} or underlay");
 291         return;
 292 } #}}}
 293
 294 sub add_underlay ($) { #{{{
 295         my $dir=shift;
 296
 297         if ($dir=~/^\//) {
 298                 unshift @{$config{underlaydirs}}, $dir;
 299         }
 300         else {
 301                 unshift @{$config{underlaydirs}}, "$config{underlaydir}/../$dir";
 302         }
 303
 304         return 1;
 305 } #}}}
 306
 307 sub readfile ($;$$) { #{{{
 308         my $file=shift;
 309         my $binary=shift;
 310         my $wantfd=shift;
 311
 312         if (-l $file) {
 313                 error("cannot read a symlink ($file)");
 314         }
 315
 316         local $/=undef;
 317         open (my $in, "<", $file) || error("failed to read $file: $!");
 318         binmode($in) if ($binary);
 319         return \*$in if $wantfd;
 320         my $ret=<$in>;
 321         close $in || error("failed to read $file: $!");
 322         return $ret;
 323 } #}}}
 324
 325 sub writefile ($$$;$$) { #{{{
 326         my $file=shift; # can include subdirs
 327         my $destdir=shift; # directory to put file in
 328         my $content=shift;
 329         my $binary=shift;
 330         my $writer=shift;
 331
 332         my $test=$file;
 333         while (length $test) {
 334                 if (-l "$destdir/$test") {
 335                         error("cannot write to a symlink ($test)");
 336                 }
 337                 $test=dirname($test);
 338         }
 339         my $newfile="$destdir/$file.ikiwiki-new";
 340         if (-l $newfile) {
 341                 error("cannot write to a symlink ($newfile)");
 342         }
 343
 344         my $dir=dirname($newfile);
 345         if (! -d $dir) {
 346                 my $d="";
 347                 foreach my $s (split(m!/+!, $dir)) {
 348                         $d.="$s/";
 349                         if (! -d $d) {
 350                                 mkdir($d) || error("failed to create directory $d: $!");
 351                         }
 352                 }
 353         }
 354
 355         my $cleanup = sub { unlink($newfile) };
 356         open (my $out, '>', $newfile) || error("failed to write $newfile: $!", $cleanup);
 357         binmode($out) if ($binary);
 358         if ($writer) {
 359                 $writer->(\*$out, $cleanup);
 360         }
 361         else {
 362                 print $out $content or error("failed writing to $newfile: $!", $cleanup);
 363         }
 364         close $out || error("failed saving $newfile: $!", $cleanup);
 365         rename($newfile, "$destdir/$file") ||
 366                 error("failed renaming $newfile to $destdir/$file: $!", $cleanup);
 367
 368         return 1;
 369 } #}}}
 370
 371 my %cleared;
 372 sub will_render ($$;$) { #{{{
 373         my $page=shift;
 374         my $dest=shift;
 375         my $clear=shift;
 376
 377         # Important security check.
 378         if (-e "$config{destdir}/$dest" && ! $config{rebuild} &&
 379             ! grep { $_ eq $dest } (@{$renderedfiles{$page}}, @{$oldrenderedfiles{$page}})) {
 380                 error("$config{destdir}/$dest independently created, not overwriting with version from $page");
 381         }
 382
 383         if (! $clear || $cleared{$page}) {
 384                 $renderedfiles{$page}=[$dest, grep { $_ ne $dest } @{$renderedfiles{$page}}];
 385         }
 386         else {
 387                 foreach my $old (@{$renderedfiles{$page}}) {
 388                         delete $destsources{$old};
 389                 }
 390                 $renderedfiles{$page}=[$dest];
 391                 $cleared{$page}=1;
 392         }
 393         $destsources{$dest}=$page;
 394
 395         return 1;
 396 } #}}}
 397
 398 sub bestlink ($$) { #{{{
 399         my $page=shift;
 400         my $link=shift;
 401
 402         my $cwd=$page;
 403         if ($link=~s/^\/+//) {
 404                 # absolute links
 405                 $cwd="";
 406         }
 407         $link=~s/\/$//;
 408
 409         do {
 410                 my $l=$cwd;
 411                 $l.="/" if length $l;
 412                 $l.=$link;
 413
 414                 if (exists $links{$l}) {
 415                         return $l;
 416                 }
 417                 elsif (exists $pagecase{lc $l}) {
 418                         return $pagecase{lc $l};
 419                 }
 420         } while $cwd=~s!/?[^/]+$!!;
 421
 422         if (length $config{userdir}) {
 423                 my $l = "$config{userdir}/".lc($link);
 424                 if (exists $links{$l}) {
 425                         return $l;
 426                 }
 427                 elsif (exists $pagecase{lc $l}) {
 428                         return $pagecase{lc $l};
 429                 }
 430         }
 431
 432         #print STDERR "warning: page $page, broken link: $link\n";
 433         return "";
 434 } #}}}
 435
 436 sub isinlinableimage ($) { #{{{
 437         my $file=shift;
 438
 439         return $file =~ /\.(png|gif|jpg|jpeg)$/i;
 440 } #}}}
 441
 442 sub pagetitle ($;$) { #{{{
 443         my $page=shift;
 444         my $unescaped=shift;
 445
 446         if ($unescaped) {
 447                 $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : chr($2)/eg;
 448         }
 449         else {
 450                 $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : "&#$2;"/eg;
 451         }
 452
 453         return $page;
 454 } #}}}
 455
 456 sub titlepage ($) { #{{{
 457         my $title=shift;
 458         $title=~s/([^-[:alnum:]:+\/.])/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
 459         return $title;
 460 } #}}}
 461
 462 sub linkpage ($) { #{{{
 463         my $link=shift;
 464         $link=~s/([^-[:alnum:]:+\/._])/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
 465         return $link;
 466 } #}}}
 467
 468 sub cgiurl (@) { #{{{
 469         my %params=@_;
 470
 471         return $config{cgiurl}."?".
 472                 join("&amp;", map $_."=".uri_escape_utf8($params{$_}), keys %params);
 473 } #}}}
 474
 475 sub baseurl (;$) { #{{{
 476         my $page=shift;
 477
 478         return "$config{url}/" if ! defined $page;
 479
 480         $page=htmlpage($page);
 481         $page=~s/[^\/]+$//;
 482         $page=~s/[^\/]+\//..\//g;
 483         return $page;
 484 } #}}}
 485
 486 sub abs2rel ($$) { #{{{
 487         # Work around very innefficient behavior in File::Spec if abs2rel
 488         # is passed two relative paths. It's much faster if paths are
 489         # absolute! (Debian bug #376658; fixed in debian unstable now)
 490         my $path="/".shift;
 491         my $base="/".shift;
 492
 493         require File::Spec;
 494         my $ret=File::Spec->abs2rel($path, $base);
 495         $ret=~s/^// if defined $ret;
 496         return $ret;
 497 } #}}}
 498
 499 sub displaytime ($;$) { #{{{
 500         my $time=shift;
 501         my $format=shift;
 502         if (! defined $format) {
 503                 $format=$config{timeformat};
 504         }
 505
 506         # strftime doesn't know about encodings, so make sure
 507         # its output is properly treated as utf8
 508         return decode_utf8(POSIX::strftime($format, localtime($time)));
 509 } #}}}
 510
 511 sub beautify_url ($) { #{{{
 512         my $url=shift;
 513
 514         if ($config{usedirs}) {
 515                 $url =~ s!/index.$config{htmlext}$!/!;
 516         }
 517         $url =~ s!^$!./!; # Browsers don't like empty links...
 518
 519         return $url;
 520 } #}}}
 521
 522 sub urlto ($$) { #{{{
 523         my $to=shift;
 524         my $from=shift;
 525
 526         if (! length $to) {
 527                 return beautify_url(baseurl($from));
 528         }
 529
 530         if (! $destsources{$to}) {
 531                 $to=htmlpage($to);
 532         }
 533
 534         my $link = abs2rel($to, dirname(htmlpage($from)));
 535
 536         return beautify_url($link);
 537 } #}}}
 538
 539 sub htmllink ($$$;@) { #{{{
 540         my $lpage=shift; # the page doing the linking
 541         my $page=shift; # the page that will contain the link (different for inline)
 542         my $link=shift;
 543         my %opts=@_;
 544
 545         $link=~s/\/$//;
 546
 547         my $bestlink;
 548         if (! $opts{forcesubpage}) {
 549                 $bestlink=bestlink($lpage, $link);
 550         }
 551         else {
 552                 $bestlink="$lpage/".lc($link);
 553         }
 554
 555         my $linktext;
 556         if (defined $opts{linktext}) {
 557                 $linktext=$opts{linktext};
 558         }
 559         else {
 560                 $linktext=pagetitle(basename($link));
 561         }
 562
 563         return "<span class=\"selflink\">$linktext</span>"
 564                 if length $bestlink && $page eq $bestlink &&
 565                    ! defined $opts{anchor};
 566
 567         if (! $destsources{$bestlink}) {
 568                 $bestlink=htmlpage($bestlink);
 569
 570                 if (! $destsources{$bestlink}) {
 571                         return $linktext unless length $config{cgiurl};
 572                         return "<span class=\"createlink\"><a href=\"".
 573                                 cgiurl(
 574                                         do => "create",
 575                                         page => pagetitle(lc($link), 1),
 576                                         from => $lpage
 577                                 ).
 578                                 "\">?</a>$linktext</span>"
 579                 }
 580         }
 581
 582         $bestlink=abs2rel($bestlink, dirname(htmlpage($page)));
 583         $bestlink=beautify_url($bestlink);
 584
 585         if (! $opts{noimageinline} && isinlinableimage($bestlink)) {
 586                 return "<img src=\"$bestlink\" alt=\"$linktext\" />";
 587         }
 588
 589         if (defined $opts{anchor}) {
 590                 $bestlink.="#".$opts{anchor};
 591         }
 592
 593         my @attrs;
 594         if (defined $opts{rel}) {
 595                 push @attrs, ' rel="'.$opts{rel}.'"';
 596         }
 597         if (defined $opts{class}) {
 598                 push @attrs, ' class="'.$opts{class}.'"';
 599         }
 600
 601         return "<a href=\"$bestlink\"@attrs>$linktext</a>";
 602 } #}}}
 603
 604 sub userlink ($) { #{{{
 605         my $user=shift;
 606
 607         my $oiduser=eval { openiduser($user) };
 608         if (defined $oiduser) {
 609                 return "<a href=\"$user\">$oiduser</a>";
 610         }
 611         else {
 612                 return htmllink("", "", escapeHTML(
 613                         length $config{userdir} ? $config{userdir}."/".$user : $user
 614                 ), noimageinline => 1);
 615         }
 616 } #}}}
 617
 618 sub htmlize ($$$) { #{{{
 619         my $page=shift;
 620         my $type=shift;
 621         my $content=shift;
 622
 623         my $oneline = $content !~ /\n/;
 624
 625         if (exists $hooks{htmlize}{$type}) {
 626                 $content=$hooks{htmlize}{$type}{call}->(
 627                         page => $page,
 628                         content => $content,
 629                 );
 630         }
 631         else {
 632                 error("htmlization of $type not supported");
 633         }
 634
 635         run_hooks(sanitize => sub {
 636                 $content=shift->(
 637                         page => $page,
 638                         content => $content,
 639                 );
 640         });
 641
 642         if ($oneline) {
 643                 # hack to get rid of enclosing junk added by markdown
 644                 # and other htmlizers
 645                 $content=~s/^<p>//i;
 646                 $content=~s/<\/p>$//i;
 647                 chomp $content;
 648         }
 649
 650         return $content;
 651 } #}}}
 652
 653 sub linkify ($$$) { #{{{
 654         my $page=shift;
 655         my $destpage=shift;
 656         my $content=shift;
 657
 658         run_hooks(linkify => sub {
 659                 $content=shift->(
 660                         page => $page,
 661                         destpage => $destpage,
 662                         content => $content,
 663                 );
 664         });
 665
 666         return $content;
 667 } #}}}
 668
 669 my %preprocessing;
 670 our $preprocess_preview=0;
 671 sub preprocess ($$$;$$) { #{{{
 672         my $page=shift; # the page the data comes from
 673         my $destpage=shift; # the page the data will appear in (different for inline)
 674         my $content=shift;
 675         my $scan=shift;
 676         my $preview=shift;
 677
 678         # Using local because it needs to be set within any nested calls
 679         # of this function.
 680         local $preprocess_preview=$preview if defined $preview;
 681
 682         my $handle=sub {
 683                 my $escape=shift;
 684                 my $prefix=shift;
 685                 my $command=shift;
 686                 my $params=shift;
 687                 if (length $escape) {
 688                         return "[[$prefix$command $params]]";
 689                 }
 690                 elsif (exists $hooks{preprocess}{$command}) {
 691                         return "" if $scan && ! $hooks{preprocess}{$command}{scan};
 692                         # Note: preserve order of params, some plugins may
 693                         # consider it significant.
 694                         my @params;
 695                         while ($params =~ m{
 696                                 (?:([-\w]+)=)?          # 1: named parameter key?
 697                                 (?:
 698                                         """(.*?)"""     # 2: triple-quoted value
 699                                 |
 700                                         "([^"]+)"       # 3: single-quoted value
 701                                 |
 702                                         (\S+)           # 4: unquoted value
 703                                 )
 704                                 (?:\s+|$)               # delimiter to next param
 705                         }sgx) {
 706                                 my $key=$1;
 707                                 my $val;
 708                                 if (defined $2) {
 709                                         $val=$2;
 710                                         $val=~s/\r\n/\n/mg;
 711                                         $val=~s/^\n+//g;
 712                                         $val=~s/\n+$//g;
 713                                 }
 714                                 elsif (defined $3) {
 715                                         $val=$3;
 716                                 }
 717                                 elsif (defined $4) {
 718                                         $val=$4;
 719                                 }
 720
 721                                 if (defined $key) {
 722                                         push @params, $key, $val;
 723                                 }
 724                                 else {
 725                                         push @params, $val, '';
 726                                 }
 727                         }
 728                         if ($preprocessing{$page}++ > 3) {
 729                                 # Avoid loops of preprocessed pages preprocessing
 730                                 # other pages that preprocess them, etc.
 731                                 #translators: The first parameter is a
 732                                 #translators: preprocessor directive name,
 733                                 #translators: the second a page name, the
 734                                 #translators: third a number.
 735                                 return "[[".sprintf(gettext("%s preprocessing loop detected on %s at depth %i"),
 736                                         $command, $page, $preprocessing{$page}).
 737                                 "]]";
 738                         }
 739                         my $ret;
 740                         if (! $scan) {
 741                                 $ret=$hooks{preprocess}{$command}{call}->(
 742                                         @params,
 743                                         page => $page,
 744                                         destpage => $destpage,
 745                                         preview => $preprocess_preview,
 746                                 );
 747                         }
 748                         else {
 749                                 # use void context during scan pass
 750                                 $hooks{preprocess}{$command}{call}->(
 751                                         @params,
 752                                         page => $page,
 753                                         destpage => $destpage,
 754                                         preview => $preprocess_preview,
 755                                 );
 756                                 $ret="";
 757                         }
 758                         $preprocessing{$page}--;
 759                         return $ret;
 760                 }
 761                 else {
 762                         return "[[$prefix$command $params]]";
 763                 }
 764         };
 765
 766         my $regex;
 767         if ($config{prefix_directives}) {
 768                 $regex = qr{
 769                         (\\?)           # 1: escape?
 770                         \[\[(!)         # directive open; 2: prefix
 771                         ([-\w]+)        # 3: command
 772                         (               # 4: the parameters..
 773                                 \s+     # Must have space if parameters present
 774                                 (?:
 775                                         (?:[-\w]+=)?            # named parameter key?
 776                                         (?:
 777                                                 """.*?"""       # triple-quoted value
 778                                                 |
 779                                                 "[^"]+"         # single-quoted value
 780                                                 |
 781                                                 [^\s\]]+        # unquoted value
 782                                         )
 783                                         \s*                     # whitespace or end
 784                                                                 # of directive
 785                                 )
 786                         *)?             # 0 or more parameters
 787                         \]\]            # directive closed
 788                 }sx;
 789         } else {
 790                 $regex = qr{
 791                         (\\?)           # 1: escape?
 792                         \[\[(!?)        # directive open; 2: optional prefix
 793                         ([-\w]+)        # 3: command
 794                         \s+
 795                         (               # 4: the parameters..
 796                                 (?:
 797                                         (?:[-\w]+=)?            # named parameter key?
 798                                         (?:
 799                                                 """.*?"""       # triple-quoted value
 800                                                 |
 801                                                 "[^"]+"         # single-quoted value
 802                                                 |
 803                                                 [^\s\]]+        # unquoted value
 804                                         )
 805                                         \s*                     # whitespace or end
 806                                                                 # of directive
 807                                 )
 808                         *)              # 0 or more parameters
 809                         \]\]            # directive closed
 810                 }sx;
 811         }
 812
 813         $content =~ s{$regex}{$handle->($1, $2, $3, $4)}eg;
 814         return $content;
 815 } #}}}
 816
 817 sub filter ($$$) { #{{{
 818         my $page=shift;
 819         my $destpage=shift;
 820         my $content=shift;
 821
 822         run_hooks(filter => sub {
 823                 $content=shift->(page => $page, destpage => $destpage,
 824                         content => $content);
 825         });
 826
 827         return $content;
 828 } #}}}
 829
 830 sub indexlink () { #{{{
 831         return "<a href=\"$config{url}\">$config{wikiname}</a>";
 832 } #}}}
 833
 834 my $wikilock;
 835
 836 sub lockwiki (;$) { #{{{
 837         my $wait=@_ ? shift : 1;
 838         # Take an exclusive lock on the wiki to prevent multiple concurrent
 839         # run issues. The lock will be dropped on program exit.
 840         if (! -d $config{wikistatedir}) {
 841                 mkdir($config{wikistatedir});
 842         }
 843         open($wikilock, '>', "$config{wikistatedir}/lockfile") ||
 844                 error ("cannot write to $config{wikistatedir}/lockfile: $!");
 845         if (! flock($wikilock, 2 | 4)) { # LOCK_EX | LOCK_NB
 846                 if ($wait) {
 847                         debug("wiki seems to be locked, waiting for lock");
 848                         my $wait=600; # arbitrary, but don't hang forever to
 849                                       # prevent process pileup
 850                         for (1..$wait) {
 851                                 return if flock($wikilock, 2 | 4);
 852                                 sleep 1;
 853                         }
 854                         error("wiki is locked; waited $wait seconds without lock being freed (possible stuck process or stale lock?)");
 855                 }
 856                 else {
 857                         return 0;
 858                 }
 859         }
 860         return 1;
 861 } #}}}
 862
 863 sub unlockwiki () { #{{{
 864         return close($wikilock) if $wikilock;
 865         return;
 866 } #}}}
 867
 868 my $commitlock;
 869
 870 sub commit_hook_enabled () { #{{{
 871         open($commitlock, '+>', "$config{wikistatedir}/commitlock") ||
 872                 error("cannot write to $config{wikistatedir}/commitlock: $!");
 873         if (! flock($commitlock, 1 | 4)) { # LOCK_SH | LOCK_NB to test
 874                 close($commitlock) || error("failed closing commitlock: $!");
 875                 return 0;
 876         }
 877         close($commitlock) || error("failed closing commitlock: $!");
 878         return 1;
 879 } #}}}
 880
 881 sub disable_commit_hook () { #{{{
 882         open($commitlock, '>', "$config{wikistatedir}/commitlock") ||
 883                 error("cannot write to $config{wikistatedir}/commitlock: $!");
 884         if (! flock($commitlock, 2)) { # LOCK_EX
 885                 error("failed to get commit lock");
 886         }
 887         return 1;
 888 } #}}}
 889
 890 sub enable_commit_hook () { #{{{
 891         return close($commitlock) if $commitlock;
 892         return;
 893 } #}}}
 894
 895 sub loadindex () { #{{{
 896         %oldrenderedfiles=%pagectime=();
 897         if (! $config{rebuild}) {
 898                 %pagesources=%pagemtime=%oldlinks=%links=%depends=
 899                         %destsources=%renderedfiles=%pagecase=%pagestate=();
 900         }
 901         open (my $in, "<", "$config{wikistatedir}/index") || return;
 902         while (<$in>) {
 903                 $_=possibly_foolish_untaint($_);
 904                 chomp;
 905                 my %items;
 906                 $items{link}=[];
 907                 $items{dest}=[];
 908                 foreach my $i (split(/ /, $_)) {
 909                         my ($item, $val)=split(/=/, $i, 2);
 910                         push @{$items{$item}}, decode_entities($val);
 911                 }
 912
 913                 next unless exists $items{src}; # skip bad lines for now
 914
 915                 my $page=pagename($items{src}[0]);
 916                 if (! $config{rebuild}) {
 917                         $pagesources{$page}=$items{src}[0];
 918                         $pagemtime{$page}=$items{mtime}[0];
 919                         $oldlinks{$page}=[@{$items{link}}];
 920                         $links{$page}=[@{$items{link}}];
 921                         $depends{$page}=$items{depends}[0] if exists $items{depends};
 922                         $destsources{$_}=$page foreach @{$items{dest}};
 923                         $renderedfiles{$page}=[@{$items{dest}}];
 924                         $pagecase{lc $page}=$page;
 925                         foreach my $k (grep /_/, keys %items) {
 926                                 my ($id, $key)=split(/_/, $k, 2);
 927                                 $pagestate{$page}{decode_entities($id)}{decode_entities($key)}=$items{$k}[0];
 928                         }
 929                 }
 930                 $oldrenderedfiles{$page}=[@{$items{dest}}];
 931                 $pagectime{$page}=$items{ctime}[0];
 932         }
 933         return close($in);
 934 } #}}}
 935
 936 sub saveindex () { #{{{
 937         run_hooks(savestate => sub { shift->() });
 938
 939         my %hookids;
 940         foreach my $type (keys %hooks) {
 941                 $hookids{encode_entities($_)}=1 foreach keys %{$hooks{$type}};
 942         }
 943         my @hookids=sort keys %hookids;
 944
 945         if (! -d $config{wikistatedir}) {
 946                 mkdir($config{wikistatedir});
 947         }
 948         my $newfile="$config{wikistatedir}/index.new";
 949         my $cleanup = sub { unlink($newfile) };
 950         open (my $out, '>', $newfile) || error("cannot write to $newfile: $!", $cleanup);
 951         foreach my $page (keys %pagemtime) {
 952                 next unless $pagemtime{$page};
 953                 my $line="mtime=$pagemtime{$page} ".
 954                         "ctime=$pagectime{$page} ".
 955                         "src=$pagesources{$page}";
 956                 $line.=" dest=$_" foreach @{$renderedfiles{$page}};
 957                 my %count;
 958                 $line.=" link=$_" foreach grep { ++$count{$_} == 1 } @{$links{$page}};
 959                 if (exists $depends{$page}) {
 960                         $line.=" depends=".encode_entities($depends{$page}, " \t\n");
 961                 }
 962                 if (exists $pagestate{$page}) {
 963                         foreach my $id (@hookids) {
 964                                 foreach my $key (keys %{$pagestate{$page}{$id}}) {
 965                                         $line.=' '.$id.'_'.encode_entities($key)."=".encode_entities($pagestate{$page}{$id}{$key}, " \t\n");
 966                                 }
 967                         }
 968                 }
 969                 print $out $line."\n" || error("failed writing to $newfile: $!", $cleanup);
 970         }
 971         close $out || error("failed saving to $newfile: $!", $cleanup);
 972         rename($newfile, "$config{wikistatedir}/index") ||
 973                 error("failed renaming $newfile to $config{wikistatedir}/index", $cleanup);
 974
 975         return 1;
 976 } #}}}
 977
 978 sub template_file ($) { #{{{
 979         my $template=shift;
 980
 981         foreach my $dir ($config{templatedir}, "$installdir/share/ikiwiki/templates") {
 982                 return "$dir/$template" if -e "$dir/$template";
 983         }
 984         return;
 985 } #}}}
 986
 987 sub template_params (@) { #{{{
 988         my $filename=template_file(shift);
 989
 990         if (! defined $filename) {
 991                 return if wantarray;
 992                 return "";
 993         }
 994
 995         my @ret=(
 996                 filter => sub {
 997                         my $text_ref = shift;
 998                         ${$text_ref} = decode_utf8(${$text_ref});
 999                 },
1000                 filename => $filename,
1001                 loop_context_vars => 1,
1002                 die_on_bad_params => 0,
1003                 @_
1004         );
1005         return wantarray ? @ret : {@ret};
1006 } #}}}
1007
1008 sub template ($;@) { #{{{
1009         require HTML::Template;
1010         return HTML::Template->new(template_params(@_));
1011 } #}}}
1012
1013 sub misctemplate ($$;@) { #{{{
1014         my $title=shift;
1015         my $pagebody=shift;
1016
1017         my $template=template("misc.tmpl");
1018         $template->param(
1019                 title => $title,
1020                 indexlink => indexlink(),
1021                 wikiname => $config{wikiname},
1022                 pagebody => $pagebody,
1023                 baseurl => baseurl(),
1024                 @_,
1025         );
1026         run_hooks(pagetemplate => sub {
1027                 shift->(page => "", destpage => "", template => $template);
1028         });
1029         return $template->output;
1030 }#}}}
1031
1032 sub hook (@) { # {{{
1033         my %param=@_;
1034
1035         if (! exists $param{type} || ! ref $param{call} || ! exists $param{id}) {
1036                 error 'hook requires type, call, and id parameters';
1037         }
1038
1039         return if $param{no_override} && exists $hooks{$param{type}}{$param{id}};
1040
1041         $hooks{$param{type}}{$param{id}}=\%param;
1042         return 1;
1043 } # }}}
1044
1045 sub run_hooks ($$) { # {{{
1046         # Calls the given sub for each hook of the given type,
1047         # passing it the hook function to call.
1048         my $type=shift;
1049         my $sub=shift;
1050
1051         if (exists $hooks{$type}) {
1052                 my @deferred;
1053                 foreach my $id (keys %{$hooks{$type}}) {
1054                         if ($hooks{$type}{$id}{last}) {
1055                                 push @deferred, $id;
1056                                 next;
1057                         }
1058                         $sub->($hooks{$type}{$id}{call});
1059                 }
1060                 foreach my $id (@deferred) {
1061                         $sub->($hooks{$type}{$id}{call});
1062                 }
1063         }
1064
1065         return 1;
1066 } #}}}
1067
1068 sub globlist_to_pagespec ($) { #{{{
1069         my @globlist=split(' ', shift);
1070
1071         my (@spec, @skip);
1072         foreach my $glob (@globlist) {
1073                 if ($glob=~/^!(.*)/) {
1074                         push @skip, $glob;
1075                 }
1076                 else {
1077                         push @spec, $glob;
1078                 }
1079         }
1080
1081         my $spec=join(' or ', @spec);
1082         if (@skip) {
1083                 my $skip=join(' and ', @skip);
1084                 if (length $spec) {
1085                         $spec="$skip and ($spec)";
1086                 }
1087                 else {
1088                         $spec=$skip;
1089                 }
1090         }
1091         return $spec;
1092 } #}}}
1093
1094 sub is_globlist ($) { #{{{
1095         my $s=shift;
1096         return ( $s =~ /[^\s]+\s+([^\s]+)/ && $1 ne "and" && $1 ne "or" );
1097 } #}}}
1098
1099 sub safequote ($) { #{{{
1100         my $s=shift;
1101         $s=~s/[{}]//g;
1102         return "q{$s}";
1103 } #}}}
1104
1105 sub add_depends ($$) { #{{{
1106         my $page=shift;
1107         my $pagespec=shift;
1108
1109         if (! exists $depends{$page}) {
1110                 $depends{$page}=$pagespec;
1111         }
1112         else {
1113                 $depends{$page}=pagespec_merge($depends{$page}, $pagespec);
1114         }
1115
1116         return 1;
1117 } # }}}
1118
1119 sub file_pruned ($$) { #{{{
1120         require File::Spec;
1121         my $file=File::Spec->canonpath(shift);
1122         my $base=File::Spec->canonpath(shift);
1123         $file =~ s#^\Q$base\E/+##;
1124
1125         my $regexp='('.join('|', @{$config{wiki_file_prune_regexps}}).')';
1126         return $file =~ m/$regexp/ && $file ne $base;
1127 } #}}}
1128
1129 sub gettext { #{{{
1130         # Only use gettext in the rare cases it's needed.
1131         if ((exists $ENV{LANG} && length $ENV{LANG}) ||
1132             (exists $ENV{LC_ALL} && length $ENV{LC_ALL}) ||
1133             (exists $ENV{LC_MESSAGES} && length $ENV{LC_MESSAGES})) {
1134                 if (! $gettext_obj) {
1135                         $gettext_obj=eval q{
1136                                 use Locale::gettext q{textdomain};
1137                                 Locale::gettext->domain('ikiwiki')
1138                         };
1139                         if ($@) {
1140                                 print STDERR "$@";
1141                                 $gettext_obj=undef;
1142                                 return shift;
1143                         }
1144                 }
1145                 return $gettext_obj->get(shift);
1146         }
1147         else {
1148                 return shift;
1149         }
1150 } #}}}
1151
1152 sub pagespec_merge ($$) { #{{{
1153         my $a=shift;
1154         my $b=shift;
1155
1156         return $a if $a eq $b;
1157
1158         # Support for old-style GlobLists.
1159         if (is_globlist($a)) {
1160                 $a=globlist_to_pagespec($a);
1161         }
1162         if (is_globlist($b)) {
1163                 $b=globlist_to_pagespec($b);
1164         }
1165
1166         return "($a) or ($b)";
1167 } #}}}
1168
1169 sub pagespec_translate ($) { #{{{
1170         # This assumes that $page is in scope in the function
1171         # that evalulates the translated pagespec code.
1172         my $spec=shift;
1173
1174         # Support for old-style GlobLists.
1175         if (is_globlist($spec)) {
1176                 $spec=globlist_to_pagespec($spec);
1177         }
1178
1179         # Convert spec to perl code.
1180         my $code="";
1181         while ($spec=~m{
1182                 \s*             # ignore whitespace
1183                 (               # 1: match a single word
1184                         \!              # !
1185                 |
1186                         \(              # (
1187                 |
1188                         \)              # )
1189                 |
1190                         \w+\([^\)]*\)   # command(params)
1191                 |
1192                         [^\s()]+        # any other text
1193                 )
1194                 \s*             # ignore whitespace
1195         }igx) {
1196                 my $word=$1;
1197                 if (lc $word eq 'and') {
1198                         $code.=' &&';
1199                 }
1200                 elsif (lc $word eq 'or') {
1201                         $code.=' ||';
1202                 }
1203                 elsif ($word eq "(" || $word eq ")" || $word eq "!") {
1204                         $code.=' '.$word;
1205                 }
1206                 elsif ($word =~ /^(\w+)\((.*)\)$/) {
1207                         if (exists $IkiWiki::PageSpec::{"match_$1"}) {
1208                                 $code.="IkiWiki::PageSpec::match_$1(\$page, ".safequote($2).", \@params)";
1209                         }
1210                         else {
1211                                 $code.=' 0';
1212                         }
1213                 }
1214                 else {
1215                         $code.=" IkiWiki::PageSpec::match_glob(\$page, ".safequote($word).", \@params)";
1216                 }
1217         }
1218
1219         return $code;
1220 } #}}}
1221
1222 sub pagespec_match ($$;@) { #{{{
1223         my $page=shift;
1224         my $spec=shift;
1225         my @params=@_;
1226
1227         # Backwards compatability with old calling convention.
1228         if (@params == 1) {
1229                 unshift @params, 'location';
1230         }
1231
1232         my $ret=eval pagespec_translate($spec);
1233         return IkiWiki::FailReason->new('syntax error') if $@;
1234         return $ret;
1235 } #}}}
1236
1237 package IkiWiki::FailReason;
1238
1239 use overload ( #{{{
1240         '""'    => sub { ${$_[0]} },
1241         '0+'    => sub { 0 },
1242         '!'     => sub { bless $_[0], 'IkiWiki::SuccessReason'},
1243         fallback => 1,
1244 ); #}}}
1245
1246 sub new { #{{{
1247         return bless \$_[1], $_[0];
1248 } #}}}
1249
1250 package IkiWiki::SuccessReason;
1251
1252 use overload ( #{{{
1253         '""'    => sub { ${$_[0]} },
1254         '0+'    => sub { 1 },
1255         '!'     => sub { bless $_[0], 'IkiWiki::FailReason'},
1256         fallback => 1,
1257 ); #}}}
1258
1259 sub new { #{{{
1260         return bless \$_[1], $_[0];
1261 }; #}}}
1262
1263 package IkiWiki::PageSpec;
1264
1265 sub match_glob ($$;@) { #{{{
1266         my $page=shift;
1267         my $glob=shift;
1268         my %params=@_;
1269
1270         my $from=exists $params{location} ? $params{location} : '';
1271
1272         # relative matching
1273         if ($glob =~ m!^\./!) {
1274                 $from=~s#/?[^/]+$##;
1275                 $glob=~s#^\./##;
1276                 $glob="$from/$glob" if length $from;
1277         }
1278
1279         # turn glob into safe regexp
1280         $glob=quotemeta($glob);
1281         $glob=~s/\\\*/.*/g;
1282         $glob=~s/\\\?/./g;
1283
1284         if ($page=~/^$glob$/i) {
1285                 if (! IkiWiki::isinternal($page) || $params{internal}) {
1286                         return IkiWiki::SuccessReason->new("$glob matches $page");
1287                 }
1288                 else {
1289                         return IkiWiki::FailReason->new("$glob matches $page, but the page is an internal page");
1290                 }
1291         }
1292         else {
1293                 return IkiWiki::FailReason->new("$glob does not match $page");
1294         }
1295 } #}}}
1296
1297 sub match_internal ($$;@) { #{{{
1298         return match_glob($_[0], $_[1], @_, internal => 1)
1299 } #}}}
1300
1301 sub match_link ($$;@) { #{{{
1302         my $page=shift;
1303         my $link=lc(shift);
1304         my %params=@_;
1305
1306         my $from=exists $params{location} ? $params{location} : '';
1307
1308         # relative matching
1309         if ($link =~ m!^\.! && defined $from) {
1310                 $from=~s#/?[^/]+$##;
1311                 $link=~s#^\./##;
1312                 $link="$from/$link" if length $from;
1313         }
1314
1315         my $links = $IkiWiki::links{$page};
1316         return IkiWiki::FailReason->new("$page has no links") unless $links && @{$links};
1317         my $bestlink = IkiWiki::bestlink($from, $link);
1318         foreach my $p (@{$links}) {
1319                 if (length $bestlink) {
1320                         return IkiWiki::SuccessReason->new("$page links to $link")
1321                                 if $bestlink eq IkiWiki::bestlink($page, $p);
1322                 }
1323                 else {
1324                         return IkiWiki::SuccessReason->new("$page links to page $p matching $link")
1325                                 if match_glob($p, $link, %params);
1326                 }
1327         }
1328         return IkiWiki::FailReason->new("$page does not link to $link");
1329 } #}}}
1330
1331 sub match_backlink ($$;@) { #{{{
1332         return match_link($_[1], $_[0], @_);
1333 } #}}}
1334
1335 sub match_created_before ($$;@) { #{{{
1336         my $page=shift;
1337         my $testpage=shift;
1338
1339         if (exists $IkiWiki::pagectime{$testpage}) {
1340                 if ($IkiWiki::pagectime{$page} < $IkiWiki::pagectime{$testpage}) {
1341                         return IkiWiki::SuccessReason->new("$page created before $testpage");
1342                 }
1343                 else {
1344                         return IkiWiki::FailReason->new("$page not created before $testpage");
1345                 }
1346         }
1347         else {
1348                 return IkiWiki::FailReason->new("$testpage has no ctime");
1349         }
1350 } #}}}
1351
1352 sub match_created_after ($$;@) { #{{{
1353         my $page=shift;
1354         my $testpage=shift;
1355
1356         if (exists $IkiWiki::pagectime{$testpage}) {
1357                 if ($IkiWiki::pagectime{$page} > $IkiWiki::pagectime{$testpage}) {
1358                         return IkiWiki::SuccessReason->new("$page created after $testpage");
1359                 }
1360                 else {
1361                         return IkiWiki::FailReason->new("$page not created after $testpage");
1362                 }
1363         }
1364         else {
1365                 return IkiWiki::FailReason->new("$testpage has no ctime");
1366         }
1367 } #}}}
1368
1369 sub match_creation_day ($$;@) { #{{{
1370         if ((gmtime($IkiWiki::pagectime{shift()}))[3] == shift) {
1371                 return IkiWiki::SuccessReason->new('creation_day matched');
1372         }
1373         else {
1374                 return IkiWiki::FailReason->new('creation_day did not match');
1375         }
1376 } #}}}
1377
1378 sub match_creation_month ($$;@) { #{{{
1379         if ((gmtime($IkiWiki::pagectime{shift()}))[4] + 1 == shift) {
1380                 return IkiWiki::SuccessReason->new('creation_month matched');
1381         }
1382         else {
1383                 return IkiWiki::FailReason->new('creation_month did not match');
1384         }
1385 } #}}}
1386
1387 sub match_creation_year ($$;@) { #{{{
1388         if ((gmtime($IkiWiki::pagectime{shift()}))[5] + 1900 == shift) {
1389                 return IkiWiki::SuccessReason->new('creation_year matched');
1390         }
1391         else {
1392                 return IkiWiki::FailReason->new('creation_year did not match');
1393         }
1394 } #}}}
1395
1396 1