git.oblomov.eu Git - ikiwiki/blob - IkiWiki.pm

   1 #!/usr/bin/perl
   2
   3 package IkiWiki;
   4
   5 use warnings;
   6 use strict;
   7 use Encode;
   8 use URI::Escape q{uri_escape_utf8};
   9 use POSIX ();
  10 use Storable;
  11 use open qw{:utf8 :std};
  12
  13 use vars qw{%config %links %oldlinks %pagemtime %pagectime %pagecase
  14         %pagestate %wikistate %renderedfiles %oldrenderedfiles
  15         %pagesources %delpagesources %destsources %depends %depends_simple
  16         @mass_depends %hooks %forcerebuild %loaded_plugins %typedlinks
  17         %oldtypedlinks %autofiles};
  18
  19 use Exporter q{import};
  20 our @EXPORT = qw(hook debug error htmlpage template template_depends
  21         deptype add_depends pagespec_match pagespec_match_list bestlink
  22         htmllink readfile writefile pagetype srcfile pagename
  23         displaytime will_render gettext ngettext urlto targetpage
  24         add_underlay pagetitle titlepage linkpage newpagefile
  25         inject add_link add_autofile
  26         %config %links %pagestate %wikistate %renderedfiles
  27         %pagesources %destsources %typedlinks);
  28 our $VERSION = 3.00; # plugin interface version, next is ikiwiki version
  29 our $version='unknown'; # VERSION_AUTOREPLACE done by Makefile, DNE
  30 our $installdir='/usr'; # INSTALLDIR_AUTOREPLACE done by Makefile, DNE
  31
  32 # Page dependency types.
  33 our $DEPEND_CONTENT=1;
  34 our $DEPEND_PRESENCE=2;
  35 our $DEPEND_LINKS=4;
  36
  37 # Optimisation.
  38 use Memoize;
  39 memoize("abs2rel");
  40 memoize("sortspec_translate");
  41 memoize("pagespec_translate");
  42 memoize("template_file");
  43
  44 sub getsetup () {
  45         wikiname => {
  46                 type => "string",
  47                 default => "wiki",
  48                 description => "name of the wiki",
  49                 safe => 1,
  50                 rebuild => 1,
  51         },
  52         adminemail => {
  53                 type => "string",
  54                 default => undef,
  55                 example => 'me@example.com',
  56                 description => "contact email for wiki",
  57                 safe => 1,
  58                 rebuild => 0,
  59         },
  60         adminuser => {
  61                 type => "string",
  62                 default => [],
  63                 description => "users who are wiki admins",
  64                 safe => 1,
  65                 rebuild => 0,
  66         },
  67         banned_users => {
  68                 type => "string",
  69                 default => [],
  70                 description => "users who are banned from the wiki",
  71                 safe => 1,
  72                 rebuild => 0,
  73         },
  74         srcdir => {
  75                 type => "string",
  76                 default => undef,
  77                 example => "$ENV{HOME}/wiki",
  78                 description => "where the source of the wiki is located",
  79                 safe => 0, # path
  80                 rebuild => 1,
  81         },
  82         destdir => {
  83                 type => "string",
  84                 default => undef,
  85                 example => "/var/www/wiki",
  86                 description => "where to build the wiki",
  87                 safe => 0, # path
  88                 rebuild => 1,
  89         },
  90         url => {
  91                 type => "string",
  92                 default => '',
  93                 example => "http://example.com/wiki",
  94                 description => "base url to the wiki",
  95                 safe => 1,
  96                 rebuild => 1,
  97         },
  98         cgiurl => {
  99                 type => "string",
 100                 default => '',
 101                 example => "http://example.com/wiki/ikiwiki.cgi",
 102                 description => "url to the ikiwiki.cgi",
 103                 safe => 1,
 104                 rebuild => 1,
 105         },
 106         cgi_wrapper => {
 107                 type => "string",
 108                 default => '',
 109                 example => "/var/www/wiki/ikiwiki.cgi",
 110                 description => "filename of cgi wrapper to generate",
 111                 safe => 0, # file
 112                 rebuild => 0,
 113         },
 114         cgi_wrappermode => {
 115                 type => "string",
 116                 default => '06755',
 117                 description => "mode for cgi_wrapper (can safely be made suid)",
 118                 safe => 0,
 119                 rebuild => 0,
 120         },
 121         rcs => {
 122                 type => "string",
 123                 default => '',
 124                 description => "rcs backend to use",
 125                 safe => 0, # don't allow overriding
 126                 rebuild => 0,
 127         },
 128         default_plugins => {
 129                 type => "internal",
 130                 default => [qw{mdwn link inline meta htmlscrubber passwordauth
 131                                 openid signinedit lockedit conditional
 132                                 recentchanges parentlinks editpage}],
 133                 description => "plugins to enable by default",
 134                 safe => 0,
 135                 rebuild => 1,
 136         },
 137         add_plugins => {
 138                 type => "string",
 139                 default => [],
 140                 description => "plugins to add to the default configuration",
 141                 safe => 1,
 142                 rebuild => 1,
 143         },
 144         disable_plugins => {
 145                 type => "string",
 146                 default => [],
 147                 description => "plugins to disable",
 148                 safe => 1,
 149                 rebuild => 1,
 150         },
 151         templatedir => {
 152                 type => "string",
 153                 default => "$installdir/share/ikiwiki/templates",
 154                 description => "additional directory to search for template files",
 155                 advanced => 1,
 156                 safe => 0, # path
 157                 rebuild => 1,
 158         },
 159         underlaydir => {
 160                 type => "string",
 161                 default => "$installdir/share/ikiwiki/basewiki",
 162                 description => "base wiki source location",
 163                 advanced => 1,
 164                 safe => 0, # path
 165                 rebuild => 0,
 166         },
 167         underlaydirbase => {
 168                 type => "internal",
 169                 default => "$installdir/share/ikiwiki",
 170                 description => "parent directory containing additional underlays",
 171                 safe => 0,
 172                 rebuild => 0,
 173         },
 174         wrappers => {
 175                 type => "internal",
 176                 default => [],
 177                 description => "wrappers to generate",
 178                 safe => 0,
 179                 rebuild => 0,
 180         },
 181         underlaydirs => {
 182                 type => "internal",
 183                 default => [],
 184                 description => "additional underlays to use",
 185                 safe => 0,
 186                 rebuild => 0,
 187         },
 188         verbose => {
 189                 type => "boolean",
 190                 example => 1,
 191                 description => "display verbose messages?",
 192                 safe => 1,
 193                 rebuild => 0,
 194         },
 195         syslog => {
 196                 type => "boolean",
 197                 example => 1,
 198                 description => "log to syslog?",
 199                 safe => 1,
 200                 rebuild => 0,
 201         },
 202         usedirs => {
 203                 type => "boolean",
 204                 default => 1,
 205                 description => "create output files named page/index.html?",
 206                 safe => 0, # changing requires manual transition
 207                 rebuild => 1,
 208         },
 209         prefix_directives => {
 210                 type => "boolean",
 211                 default => 1,
 212                 description => "use '!'-prefixed preprocessor directives?",
 213                 safe => 0, # changing requires manual transition
 214                 rebuild => 1,
 215         },
 216         indexpages => {
 217                 type => "boolean",
 218                 default => 0,
 219                 description => "use page/index.mdwn source files",
 220                 safe => 1,
 221                 rebuild => 1,
 222         },
 223         discussion => {
 224                 type => "boolean",
 225                 default => 1,
 226                 description => "enable Discussion pages?",
 227                 safe => 1,
 228                 rebuild => 1,
 229         },
 230         discussionpage => {
 231                 type => "string",
 232                 default => gettext("Discussion"),
 233                 description => "name of Discussion pages",
 234                 safe => 1,
 235                 rebuild => 1,
 236         },
 237         html5 => {
 238                 type => "boolean",
 239                 default => 0,
 240                 description => "generate HTML5? (experimental)",
 241                 advanced => 1,
 242                 safe => 1,
 243                 rebuild => 1,
 244         },
 245         sslcookie => {
 246                 type => "boolean",
 247                 default => 0,
 248                 description => "only send cookies over SSL connections?",
 249                 advanced => 1,
 250                 safe => 1,
 251                 rebuild => 0,
 252         },
 253         default_pageext => {
 254                 type => "string",
 255                 default => "mdwn",
 256                 description => "extension to use for new pages",
 257                 safe => 0, # not sanitized
 258                 rebuild => 0,
 259         },
 260         htmlext => {
 261                 type => "string",
 262                 default => "html",
 263                 description => "extension to use for html files",
 264                 safe => 0, # not sanitized
 265                 rebuild => 1,
 266         },
 267         timeformat => {
 268                 type => "string",
 269                 default => '%c',
 270                 description => "strftime format string to display date",
 271                 advanced => 1,
 272                 safe => 1,
 273                 rebuild => 1,
 274         },
 275         locale => {
 276                 type => "string",
 277                 default => undef,
 278                 example => "en_US.UTF-8",
 279                 description => "UTF-8 locale to use",
 280                 advanced => 1,
 281                 safe => 0,
 282                 rebuild => 1,
 283         },
 284         userdir => {
 285                 type => "string",
 286                 default => "",
 287                 example => "users",
 288                 description => "put user pages below specified page",
 289                 safe => 1,
 290                 rebuild => 1,
 291         },
 292         numbacklinks => {
 293                 type => "integer",
 294                 default => 10,
 295                 description => "how many backlinks to show before hiding excess (0 to show all)",
 296                 safe => 1,
 297                 rebuild => 1,
 298         },
 299         hardlink => {
 300                 type => "boolean",
 301                 default => 0,
 302                 description => "attempt to hardlink source files? (optimisation for large files)",
 303                 advanced => 1,
 304                 safe => 0, # paranoia
 305                 rebuild => 0,
 306         },
 307         umask => {
 308                 type => "integer",
 309                 example => "022",
 310                 description => "force ikiwiki to use a particular umask",
 311                 advanced => 1,
 312                 safe => 0, # paranoia
 313                 rebuild => 0,
 314         },
 315         wrappergroup => {
 316                 type => "string",
 317                 example => "ikiwiki",
 318                 description => "group for wrappers to run in",
 319                 advanced => 1,
 320                 safe => 0, # paranoia
 321                 rebuild => 0,
 322         },
 323         libdir => {
 324                 type => "string",
 325                 default => "",
 326                 example => "$ENV{HOME}/.ikiwiki/",
 327                 description => "extra library and plugin directory",
 328                 advanced => 1,
 329                 safe => 0, # directory
 330                 rebuild => 0,
 331         },
 332         ENV => {
 333                 type => "string",
 334                 default => {},
 335                 description => "environment variables",
 336                 safe => 0, # paranoia
 337                 rebuild => 0,
 338         },
 339         include => {
 340                 type => "string",
 341                 default => undef,
 342                 example => '^\.htaccess$',
 343                 description => "regexp of normally excluded files to include",
 344                 advanced => 1,
 345                 safe => 0, # regexp
 346                 rebuild => 1,
 347         },
 348         exclude => {
 349                 type => "string",
 350                 default => undef,
 351                 example => '^(*\.private|Makefile)$',
 352                 description => "regexp of files that should be skipped",
 353                 advanced => 1,
 354                 safe => 0, # regexp
 355                 rebuild => 1,
 356         },
 357         wiki_file_prune_regexps => {
 358                 type => "internal",
 359                 default => [qr/(^|\/)\.\.(\/|$)/, qr/^\//, qr/^\./, qr/\/\./,
 360                         qr/\.x?html?$/, qr/\.ikiwiki-new$/,
 361                         qr/(^|\/).svn\//, qr/.arch-ids\//, qr/{arch}\//,
 362                         qr/(^|\/)_MTN\//, qr/(^|\/)_darcs\//,
 363                         qr/(^|\/)CVS\//, qr/\.dpkg-tmp$/],
 364                 description => "regexps of source files to ignore",
 365                 safe => 0,
 366                 rebuild => 1,
 367         },
 368         wiki_file_chars => {
 369                 type => "string",
 370                 description => "specifies the characters that are allowed in source filenames",
 371                 default => "-[:alnum:]+/.:_",
 372                 safe => 0,
 373                 rebuild => 1,
 374         },
 375         wiki_file_regexp => {
 376                 type => "internal",
 377                 description => "regexp of legal source files",
 378                 safe => 0,
 379                 rebuild => 1,
 380         },
 381         web_commit_regexp => {
 382                 type => "internal",
 383                 default => qr/^web commit (by (.*?(?=: |$))|from ([0-9a-fA-F:.]+[0-9a-fA-F])):?(.*)/,
 384                 description => "regexp to parse web commits from logs",
 385                 safe => 0,
 386                 rebuild => 0,
 387         },
 388         cgi => {
 389                 type => "internal",
 390                 default => 0,
 391                 description => "run as a cgi",
 392                 safe => 0,
 393                 rebuild => 0,
 394         },
 395         cgi_disable_uploads => {
 396                 type => "internal",
 397                 default => 1,
 398                 description => "whether CGI should accept file uploads",
 399                 safe => 0,
 400                 rebuild => 0,
 401         },
 402         post_commit => {
 403                 type => "internal",
 404                 default => 0,
 405                 description => "run as a post-commit hook",
 406                 safe => 0,
 407                 rebuild => 0,
 408         },
 409         rebuild => {
 410                 type => "internal",
 411                 default => 0,
 412                 description => "running in rebuild mode",
 413                 safe => 0,
 414                 rebuild => 0,
 415         },
 416         setup => {
 417                 type => "internal",
 418                 default => undef,
 419                 description => "running in setup mode",
 420                 safe => 0,
 421                 rebuild => 0,
 422         },
 423         clean => {
 424                 type => "internal",
 425                 default => 0,
 426                 description => "running in clean mode",
 427                 safe => 0,
 428                 rebuild => 0,
 429         },
 430         refresh => {
 431                 type => "internal",
 432                 default => 0,
 433                 description => "running in refresh mode",
 434                 safe => 0,
 435                 rebuild => 0,
 436         },
 437         test_receive => {
 438                 type => "internal",
 439                 default => 0,
 440                 description => "running in receive test mode",
 441                 safe => 0,
 442                 rebuild => 0,
 443         },
 444         wrapper_background_command => {
 445                 type => "internal",
 446                 default => '',
 447                 description => "background shell command to run",
 448                 safe => 0,
 449                 rebuild => 0,
 450         },
 451         gettime => {
 452                 type => "internal",
 453                 description => "running in gettime mode",
 454                 safe => 0,
 455                 rebuild => 0,
 456         },
 457         w3mmode => {
 458                 type => "internal",
 459                 default => 0,
 460                 description => "running in w3mmode",
 461                 safe => 0,
 462                 rebuild => 0,
 463         },
 464         wikistatedir => {
 465                 type => "internal",
 466                 default => undef,
 467                 description => "path to the .ikiwiki directory holding ikiwiki state",
 468                 safe => 0,
 469                 rebuild => 0,
 470         },
 471         setupfile => {
 472                 type => "internal",
 473                 default => undef,
 474                 description => "path to setup file",
 475                 safe => 0,
 476                 rebuild => 0,
 477         },
 478         setuptype => {
 479                 type => "internal",
 480                 default => "Standard",
 481                 description => "perl class to use to dump setup file",
 482                 safe => 0,
 483                 rebuild => 0,
 484         },
 485         allow_symlinks_before_srcdir => {
 486                 type => "boolean",
 487                 default => 0,
 488                 description => "allow symlinks in the path leading to the srcdir (potentially insecure)",
 489                 safe => 0,
 490                 rebuild => 0,
 491         },
 492 }
 493
 494 sub defaultconfig () {
 495         my %s=getsetup();
 496         my @ret;
 497         foreach my $key (keys %s) {
 498                 push @ret, $key, $s{$key}->{default};
 499         }
 500         use Data::Dumper;
 501         return @ret;
 502 }
 503
 504 # URL to top of wiki as a path starting with /, valid from any wiki page or
 505 # the CGI; if that's not possible, an absolute URL. Either way, it ends with /
 506 my $local_url;
 507 # URL to CGI script, similar to $local_url
 508 my $local_cgiurl;
 509
 510 sub checkconfig () {
 511         # locale stuff; avoid LC_ALL since it overrides everything
 512         if (defined $ENV{LC_ALL}) {
 513                 $ENV{LANG} = $ENV{LC_ALL};
 514                 delete $ENV{LC_ALL};
 515         }
 516         if (defined $config{locale}) {
 517                 if (POSIX::setlocale(&POSIX::LC_ALL, $config{locale})) {
 518                         $ENV{LANG}=$config{locale};
 519                         define_gettext();
 520                 }
 521         }
 522
 523         if (! defined $config{wiki_file_regexp}) {
 524                 $config{wiki_file_regexp}=qr/(^[$config{wiki_file_chars}]+$)/;
 525         }
 526
 527         if (ref $config{ENV} eq 'HASH') {
 528                 foreach my $val (keys %{$config{ENV}}) {
 529                         $ENV{$val}=$config{ENV}{$val};
 530                 }
 531         }
 532
 533         if ($config{w3mmode}) {
 534                 eval q{use Cwd q{abs_path}};
 535                 error($@) if $@;
 536                 $config{srcdir}=possibly_foolish_untaint(abs_path($config{srcdir}));
 537                 $config{destdir}=possibly_foolish_untaint(abs_path($config{destdir}));
 538                 $config{cgiurl}="file:///\$LIB/ikiwiki-w3m.cgi/".$config{cgiurl}
 539                         unless $config{cgiurl} =~ m!file:///!;
 540                 $config{url}="file://".$config{destdir};
 541         }
 542
 543         if ($config{cgi} && ! length $config{url}) {
 544                 error(gettext("Must specify url to wiki with --url when using --cgi"));
 545         }
 546
 547         if (defined $config{url} && length $config{url}) {
 548                 eval q{use URI};
 549                 my $baseurl = URI->new($config{url});
 550
 551                 $local_url = $baseurl->path . "/";
 552                 $local_cgiurl = undef;
 553
 554                 if (length $config{cgiurl}) {
 555                         my $cgiurl = URI->new($config{cgiurl});
 556
 557                         $local_cgiurl = $cgiurl->path;
 558
 559                         if ($cgiurl->scheme ne $baseurl->scheme or
 560                                 $cgiurl->authority ne $baseurl->authority) {
 561                                 # too far apart, fall back to absolute URLs
 562                                 $local_url = "$config{url}/";
 563                                 $local_cgiurl = $config{cgiurl};
 564                         }
 565                 }
 566
 567                 $local_url =~ s{//$}{/};
 568         }
 569         else {
 570                 $local_cgiurl = $config{cgiurl};
 571         }
 572
 573         $config{wikistatedir}="$config{srcdir}/.ikiwiki"
 574                 unless exists $config{wikistatedir} && defined $config{wikistatedir};
 575
 576         if (defined $config{umask}) {
 577                 umask(possibly_foolish_untaint($config{umask}));
 578         }
 579
 580         run_hooks(checkconfig => sub { shift->() });
 581
 582         return 1;
 583 }
 584
 585 sub listplugins () {
 586         my %ret;
 587
 588         foreach my $dir (@INC, $config{libdir}) {
 589                 next unless defined $dir && length $dir;
 590                 foreach my $file (glob("$dir/IkiWiki/Plugin/*.pm")) {
 591                         my ($plugin)=$file=~/.*\/(.*)\.pm$/;
 592                         $ret{$plugin}=1;
 593                 }
 594         }
 595         foreach my $dir ($config{libdir}, "$installdir/lib/ikiwiki") {
 596                 next unless defined $dir && length $dir;
 597                 foreach my $file (glob("$dir/plugins/*")) {
 598                         $ret{basename($file)}=1 if -x $file;
 599                 }
 600         }
 601
 602         return keys %ret;
 603 }
 604
 605 sub loadplugins () {
 606         if (defined $config{libdir} && length $config{libdir}) {
 607                 unshift @INC, possibly_foolish_untaint($config{libdir});
 608         }
 609
 610         foreach my $plugin (@{$config{default_plugins}}, @{$config{add_plugins}}) {
 611                 loadplugin($plugin);
 612         }
 613
 614         if ($config{rcs}) {
 615                 if (exists $hooks{rcs}) {
 616                         error(gettext("cannot use multiple rcs plugins"));
 617                 }
 618                 loadplugin($config{rcs});
 619         }
 620         if (! exists $hooks{rcs}) {
 621                 loadplugin("norcs");
 622         }
 623
 624         run_hooks(getopt => sub { shift->() });
 625         if (grep /^-/, @ARGV) {
 626                 print STDERR "Unknown option (or missing parameter): $_\n"
 627                         foreach grep /^-/, @ARGV;
 628                 usage();
 629         }
 630
 631         return 1;
 632 }
 633
 634 sub loadplugin ($;$) {
 635         my $plugin=shift;
 636         my $force=shift;
 637
 638         return if ! $force && grep { $_ eq $plugin} @{$config{disable_plugins}};
 639
 640         foreach my $dir (defined $config{libdir} ? possibly_foolish_untaint($config{libdir}) : undef,
 641                          "$installdir/lib/ikiwiki") {
 642                 if (defined $dir && -x "$dir/plugins/$plugin") {
 643                         eval { require IkiWiki::Plugin::external };
 644                         if ($@) {
 645                                 my $reason=$@;
 646                                 error(sprintf(gettext("failed to load external plugin needed for %s plugin: %s"), $plugin, $reason));
 647                         }
 648                         import IkiWiki::Plugin::external "$dir/plugins/$plugin";
 649                         $loaded_plugins{$plugin}=1;
 650                         return 1;
 651                 }
 652         }
 653
 654         my $mod="IkiWiki::Plugin::".possibly_foolish_untaint($plugin);
 655         eval qq{use $mod};
 656         if ($@) {
 657                 error("Failed to load plugin $mod: $@");
 658         }
 659         $loaded_plugins{$plugin}=1;
 660         return 1;
 661 }
 662
 663 sub error ($;$) {
 664         my $message=shift;
 665         my $cleaner=shift;
 666         log_message('err' => $message) if $config{syslog};
 667         if (defined $cleaner) {
 668                 $cleaner->();
 669         }
 670         die $message."\n";
 671 }
 672
 673 sub debug ($) {
 674         return unless $config{verbose};
 675         return log_message(debug => @_);
 676 }
 677
 678 my $log_open=0;
 679 sub log_message ($$) {
 680         my $type=shift;
 681
 682         if ($config{syslog}) {
 683                 require Sys::Syslog;
 684                 if (! $log_open) {
 685                         Sys::Syslog::setlogsock('unix');
 686                         Sys::Syslog::openlog('ikiwiki', '', 'user');
 687                         $log_open=1;
 688                 }
 689                 return eval {
 690                         Sys::Syslog::syslog($type, "[$config{wikiname}] %s", join(" ", @_));
 691                 };
 692         }
 693         elsif (! $config{cgi}) {
 694                 return print "@_\n";
 695         }
 696         else {
 697                 return print STDERR "@_\n";
 698         }
 699 }
 700
 701 sub possibly_foolish_untaint ($) {
 702         my $tainted=shift;
 703         my ($untainted)=$tainted=~/(.*)/s;
 704         return $untainted;
 705 }
 706
 707 sub basename ($) {
 708         my $file=shift;
 709
 710         $file=~s!.*/+!!;
 711         return $file;
 712 }
 713
 714 sub dirname ($) {
 715         my $file=shift;
 716
 717         $file=~s!/*[^/]+$!!;
 718         return $file;
 719 }
 720
 721 sub isinternal ($) {
 722         my $page=shift;
 723         return exists $pagesources{$page} &&
 724                 $pagesources{$page} =~ /\._([^.]+)$/;
 725 }
 726
 727 sub pagetype ($) {
 728         my $file=shift;
 729
 730         if ($file =~ /\.([^.]+)$/) {
 731                 return $1 if exists $hooks{htmlize}{$1};
 732         }
 733         my $base=basename($file);
 734         if (exists $hooks{htmlize}{$base} &&
 735             $hooks{htmlize}{$base}{noextension}) {
 736                 return $base;
 737         }
 738         return;
 739 }
 740
 741 my %pagename_cache;
 742
 743 sub pagename ($) {
 744         my $file=shift;
 745
 746         if (exists $pagename_cache{$file}) {
 747                 return $pagename_cache{$file};
 748         }
 749
 750         my $type=pagetype($file);
 751         my $page=$file;
 752         $page=~s/\Q.$type\E*$//
 753                 if defined $type && !$hooks{htmlize}{$type}{keepextension}
 754                         && !$hooks{htmlize}{$type}{noextension};
 755         if ($config{indexpages} && $page=~/(.*)\/index$/) {
 756                 $page=$1;
 757         }
 758
 759         $pagename_cache{$file} = $page;
 760         return $page;
 761 }
 762
 763 sub newpagefile ($$) {
 764         my $page=shift;
 765         my $type=shift;
 766
 767         if (! $config{indexpages} || $page eq 'index') {
 768                 return $page.".".$type;
 769         }
 770         else {
 771                 return $page."/index.".$type;
 772         }
 773 }
 774
 775 sub targetpage ($$;$) {
 776         my $page=shift;
 777         my $ext=shift;
 778         my $filename=shift;
 779
 780         if (defined $filename) {
 781                 return $page."/".$filename.".".$ext;
 782         }
 783         elsif (! $config{usedirs} || $page eq 'index') {
 784                 return $page.".".$ext;
 785         }
 786         else {
 787                 return $page."/index.".$ext;
 788         }
 789 }
 790
 791 sub htmlpage ($) {
 792         my $page=shift;
 793
 794         return targetpage($page, $config{htmlext});
 795 }
 796
 797 sub srcfile_stat {
 798         my $file=shift;
 799         my $nothrow=shift;
 800
 801         return "$config{srcdir}/$file", stat(_) if -e "$config{srcdir}/$file";
 802         foreach my $dir (@{$config{underlaydirs}}, $config{underlaydir}) {
 803                 return "$dir/$file", stat(_) if -e "$dir/$file";
 804         }
 805         error("internal error: $file cannot be found in $config{srcdir} or underlay") unless $nothrow;
 806         return;
 807 }
 808
 809 sub srcfile ($;$) {
 810         return (srcfile_stat(@_))[0];
 811 }
 812
 813 sub add_underlay ($) {
 814         my $dir=shift;
 815
 816         if ($dir !~ /^\//) {
 817                 $dir="$config{underlaydirbase}/$dir";
 818         }
 819
 820         if (! grep { $_ eq $dir } @{$config{underlaydirs}}) {
 821                 unshift @{$config{underlaydirs}}, $dir;
 822         }
 823
 824         return 1;
 825 }
 826
 827 sub readfile ($;$$) {
 828         my $file=shift;
 829         my $binary=shift;
 830         my $wantfd=shift;
 831
 832         if (-l $file) {
 833                 error("cannot read a symlink ($file)");
 834         }
 835
 836         local $/=undef;
 837         open (my $in, "<", $file) || error("failed to read $file: $!");
 838         binmode($in) if ($binary);
 839         return \*$in if $wantfd;
 840         my $ret=<$in>;
 841         # check for invalid utf-8, and toss it back to avoid crashes
 842         if (! utf8::valid($ret)) {
 843                 $ret=encode_utf8($ret);
 844         }
 845         close $in || error("failed to read $file: $!");
 846         return $ret;
 847 }
 848
 849 sub prep_writefile ($$) {
 850         my $file=shift;
 851         my $destdir=shift;
 852
 853         my $test=$file;
 854         while (length $test) {
 855                 if (-l "$destdir/$test") {
 856                         error("cannot write to a symlink ($test)");
 857                 }
 858                 if (-f _ && $test ne $file) {
 859                         # Remove conflicting file.
 860                         foreach my $p (keys %renderedfiles, keys %oldrenderedfiles) {
 861                                 foreach my $f (@{$renderedfiles{$p}}, @{$oldrenderedfiles{$p}}) {
 862                                         if ($f eq $test) {
 863                                                 unlink("$destdir/$test");
 864                                                 last;
 865                                         }
 866                                 }
 867                         }
 868                 }
 869                 $test=dirname($test);
 870         }
 871
 872         my $dir=dirname("$destdir/$file");
 873         if (! -d $dir) {
 874                 my $d="";
 875                 foreach my $s (split(m!/+!, $dir)) {
 876                         $d.="$s/";
 877                         if (! -d $d) {
 878                                 mkdir($d) || error("failed to create directory $d: $!");
 879                         }
 880                 }
 881         }
 882
 883         return 1;
 884 }
 885
 886 sub writefile ($$$;$$) {
 887         my $file=shift; # can include subdirs
 888         my $destdir=shift; # directory to put file in
 889         my $content=shift;
 890         my $binary=shift;
 891         my $writer=shift;
 892
 893         prep_writefile($file, $destdir);
 894
 895         my $newfile="$destdir/$file.ikiwiki-new";
 896         if (-l $newfile) {
 897                 error("cannot write to a symlink ($newfile)");
 898         }
 899
 900         my $cleanup = sub { unlink($newfile) };
 901         open (my $out, '>', $newfile) || error("failed to write $newfile: $!", $cleanup);
 902         binmode($out) if ($binary);
 903         if ($writer) {
 904                 $writer->(\*$out, $cleanup);
 905         }
 906         else {
 907                 print $out $content or error("failed writing to $newfile: $!", $cleanup);
 908         }
 909         close $out || error("failed saving $newfile: $!", $cleanup);
 910         rename($newfile, "$destdir/$file") ||
 911                 error("failed renaming $newfile to $destdir/$file: $!", $cleanup);
 912
 913         return 1;
 914 }
 915
 916 my %cleared;
 917 sub will_render ($$;$) {
 918         my $page=shift;
 919         my $dest=shift;
 920         my $clear=shift;
 921
 922         # Important security check for independently created files.
 923         if (-e "$config{destdir}/$dest" && ! $config{rebuild} &&
 924             ! grep { $_ eq $dest } (@{$renderedfiles{$page}}, @{$oldrenderedfiles{$page}}, @{$wikistate{editpage}{previews}})) {
 925                 my $from_other_page=0;
 926                 # Expensive, but rarely runs.
 927                 foreach my $p (keys %renderedfiles, keys %oldrenderedfiles) {
 928                         if (grep {
 929                                 $_ eq $dest ||
 930                                 dirname($_) eq $dest
 931                             } @{$renderedfiles{$p}}, @{$oldrenderedfiles{$p}}) {
 932                                 $from_other_page=1;
 933                                 last;
 934                         }
 935                 }
 936
 937                 error("$config{destdir}/$dest independently created, not overwriting with version from $page")
 938                         unless $from_other_page;
 939         }
 940
 941         # If $dest exists as a directory, remove conflicting files in it
 942         # rendered from other pages.
 943         if (-d _) {
 944                 foreach my $p (keys %renderedfiles, keys %oldrenderedfiles) {
 945                         foreach my $f (@{$renderedfiles{$p}}, @{$oldrenderedfiles{$p}}) {
 946                                 if (dirname($f) eq $dest) {
 947                                         unlink("$config{destdir}/$f");
 948                                         rmdir(dirname("$config{destdir}/$f"));
 949                                 }
 950                         }
 951                 }
 952         }
 953
 954         if (! $clear || $cleared{$page}) {
 955                 $renderedfiles{$page}=[$dest, grep { $_ ne $dest } @{$renderedfiles{$page}}];
 956         }
 957         else {
 958                 foreach my $old (@{$renderedfiles{$page}}) {
 959                         delete $destsources{$old};
 960                 }
 961                 $renderedfiles{$page}=[$dest];
 962                 $cleared{$page}=1;
 963         }
 964         $destsources{$dest}=$page;
 965
 966         return 1;
 967 }
 968
 969 sub bestlink ($$) {
 970         my $page=shift;
 971         my $link=shift;
 972
 973         my $cwd=$page;
 974         if ($link=~s/^\/+//) {
 975                 # absolute links
 976                 $cwd="";
 977         }
 978         $link=~s/\/$//;
 979
 980         do {
 981                 my $l=$cwd;
 982                 $l.="/" if length $l;
 983                 $l.=$link;
 984
 985                 if (exists $pagesources{$l}) {
 986                         return $l;
 987                 }
 988                 elsif (exists $pagecase{lc $l}) {
 989                         return $pagecase{lc $l};
 990                 }
 991         } while $cwd=~s{/?[^/]+$}{};
 992
 993         if (length $config{userdir}) {
 994                 my $l = "$config{userdir}/".lc($link);
 995                 if (exists $pagesources{$l}) {
 996                         return $l;
 997                 }
 998                 elsif (exists $pagecase{lc $l}) {
 999                         return $pagecase{lc $l};
1000                 }
1001         }
1002
1003         #print STDERR "warning: page $page, broken link: $link\n";
1004         return "";
1005 }
1006
1007 sub isinlinableimage ($) {
1008         my $file=shift;
1009
1010         return $file =~ /\.(png|gif|jpg|jpeg)$/i;
1011 }
1012
1013 sub pagetitle ($;$) {
1014         my $page=shift;
1015         my $unescaped=shift;
1016
1017         if ($unescaped) {
1018                 $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : chr($2)/eg;
1019         }
1020         else {
1021                 $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : "&#$2;"/eg;
1022         }
1023
1024         return $page;
1025 }
1026
1027 sub titlepage ($) {
1028         my $title=shift;
1029         # support use w/o %config set
1030         my $chars = defined $config{wiki_file_chars} ? $config{wiki_file_chars} : "-[:alnum:]+/.:_";
1031         $title=~s/([^$chars]|_)/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
1032         return $title;
1033 }
1034
1035 sub linkpage ($) {
1036         my $link=shift;
1037         my $chars = defined $config{wiki_file_chars} ? $config{wiki_file_chars} : "-[:alnum:]+/.:_";
1038         $link=~s/([^$chars])/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
1039         return $link;
1040 }
1041
1042 sub cgiurl (@) {
1043         my %params=@_;
1044
1045         my $cgiurl=$local_cgiurl;
1046
1047         if (exists $params{cgiurl}) {
1048                 $cgiurl=$params{cgiurl};
1049                 delete $params{cgiurl};
1050         }
1051
1052         unless (%params) {
1053                 return $cgiurl;
1054         }
1055
1056         return $cgiurl."?".
1057                 join("&amp;", map $_."=".uri_escape_utf8($params{$_}), keys %params);
1058 }
1059
1060 sub baseurl (;$) {
1061         my $page=shift;
1062
1063         return $local_url if ! defined $page;
1064
1065         $page=htmlpage($page);
1066         $page=~s/[^\/]+$//;
1067         $page=~s/[^\/]+\//..\//g;
1068         return $page;
1069 }
1070
1071 sub urlabs ($$) {
1072         my $url=shift;
1073         my $urlbase=shift;
1074
1075         eval q{use URI};
1076         URI->new_abs($url, $urlbase)->as_string;
1077 }
1078
1079 sub abs2rel ($$) {
1080         # Work around very innefficient behavior in File::Spec if abs2rel
1081         # is passed two relative paths. It's much faster if paths are
1082         # absolute! (Debian bug #376658; fixed in debian unstable now)
1083         my $path="/".shift;
1084         my $base="/".shift;
1085
1086         require File::Spec;
1087         my $ret=File::Spec->abs2rel($path, $base);
1088         $ret=~s/^// if defined $ret;
1089         return $ret;
1090 }
1091
1092 sub displaytime ($;$$) {
1093         # Plugins can override this function to mark up the time to
1094         # display.
1095         my $time=formattime($_[0], $_[1]);
1096         if ($config{html5}) {
1097                 return '<time datetime="'.date_3339($_[0]).'"'.
1098                         ($_[2] ? ' pubdate="pubdate"' : '').
1099                         '>'.$time.'</time>';
1100         }
1101         else {
1102                 return '<span class="date">'.$time.'</span>';
1103         }
1104 }
1105
1106 sub formattime ($;$) {
1107         # Plugins can override this function to format the time.
1108         my $time=shift;
1109         my $format=shift;
1110         if (! defined $format) {
1111                 $format=$config{timeformat};
1112         }
1113
1114         # strftime doesn't know about encodings, so make sure
1115         # its output is properly treated as utf8
1116         return decode_utf8(POSIX::strftime($format, localtime($time)));
1117 }
1118
1119 sub date_3339 ($) {
1120         my $time=shift;
1121
1122         my $lc_time=POSIX::setlocale(&POSIX::LC_TIME);
1123         POSIX::setlocale(&POSIX::LC_TIME, "C");
1124         my $ret=POSIX::strftime("%Y-%m-%dT%H:%M:%SZ", gmtime($time));
1125         POSIX::setlocale(&POSIX::LC_TIME, $lc_time);
1126         return $ret;
1127 }
1128
1129 sub beautify_urlpath ($) {
1130         my $url=shift;
1131
1132         # Ensure url is not an empty link, and if necessary,
1133         # add ./ to avoid colon confusion.
1134         if ($url !~ /^\// && $url !~ /^\.\.?\//) {
1135                 $url="./$url";
1136         }
1137
1138         if ($config{usedirs}) {
1139                 $url =~ s!/index.$config{htmlext}$!/!;
1140         }
1141
1142         return $url;
1143 }
1144
1145 sub urlto ($;$$) {
1146         my $to=shift;
1147         my $from=shift;
1148         my $absolute=shift;
1149
1150         if (! length $to) {
1151                 $to = 'index';
1152         }
1153
1154         if (! $destsources{$to}) {
1155                 $to=htmlpage($to);
1156         }
1157
1158         if ($absolute) {
1159                 return $config{url}.beautify_urlpath("/".$to);
1160         }
1161
1162         if (! defined $from) {
1163                 my $u = $local_url;
1164                 $u =~ s{/$}{};
1165                 return $u.beautify_urlpath("/".$to);
1166         }
1167
1168         my $link = abs2rel($to, dirname(htmlpage($from)));
1169
1170         return beautify_urlpath($link);
1171 }
1172
1173 sub isselflink ($$) {
1174         # Plugins can override this function to support special types
1175         # of selflinks.
1176         my $page=shift;
1177         my $link=shift;
1178
1179         return $page eq $link;
1180 }
1181
1182 sub htmllink ($$$;@) {
1183         my $lpage=shift; # the page doing the linking
1184         my $page=shift; # the page that will contain the link (different for inline)
1185         my $link=shift;
1186         my %opts=@_;
1187
1188         $link=~s/\/$//;
1189
1190         my $bestlink;
1191         if (! $opts{forcesubpage}) {
1192                 $bestlink=bestlink($lpage, $link);
1193         }
1194         else {
1195                 $bestlink="$lpage/".lc($link);
1196         }
1197
1198         my $linktext;
1199         if (defined $opts{linktext}) {
1200                 $linktext=$opts{linktext};
1201         }
1202         else {
1203                 $linktext=pagetitle(basename($link));
1204         }
1205
1206         return "<span class=\"selflink\">$linktext</span>"
1207                 if length $bestlink && isselflink($page, $bestlink) &&
1208                    ! defined $opts{anchor};
1209
1210         if (! $destsources{$bestlink}) {
1211                 $bestlink=htmlpage($bestlink);
1212
1213                 if (! $destsources{$bestlink}) {
1214                         my $cgilink = "";
1215                         if (length $config{cgiurl}) {
1216                                 $cgilink = "<a href=\"".
1217                                         cgiurl(
1218                                                 do => "create",
1219                                                 page => lc($link),
1220                                                 from => $lpage
1221                                         )."\" rel=\"nofollow\">?</a>";
1222                         }
1223                         return "<span class=\"createlink\">$cgilink$linktext</span>"
1224                 }
1225         }
1226
1227         $bestlink=abs2rel($bestlink, dirname(htmlpage($page)));
1228         $bestlink=beautify_urlpath($bestlink);
1229
1230         if (! $opts{noimageinline} && isinlinableimage($bestlink)) {
1231                 return "<img src=\"$bestlink\" alt=\"$linktext\" />";
1232         }
1233
1234         if (defined $opts{anchor}) {
1235                 $bestlink.="#".$opts{anchor};
1236         }
1237
1238         my @attrs;
1239         foreach my $attr (qw{rel class title}) {
1240                 if (defined $opts{$attr}) {
1241                         push @attrs, " $attr=\"$opts{$attr}\"";
1242                 }
1243         }
1244
1245         return "<a href=\"$bestlink\"@attrs>$linktext</a>";
1246 }
1247
1248 sub userpage ($) {
1249         my $user=shift;
1250         return length $config{userdir} ? "$config{userdir}/$user" : $user;
1251 }
1252
1253 sub openiduser ($) {
1254         my $user=shift;
1255
1256         if (defined $user && $user =~ m!^https?://! &&
1257             eval q{use Net::OpenID::VerifiedIdentity; 1} && !$@) {
1258                 my $display;
1259
1260                 if (Net::OpenID::VerifiedIdentity->can("DisplayOfURL")) {
1261                         $display = Net::OpenID::VerifiedIdentity::DisplayOfURL($user);
1262                 }
1263                 else {
1264                         # backcompat with old version
1265                         my $oid=Net::OpenID::VerifiedIdentity->new(identity => $user);
1266                         $display=$oid->display;
1267                 }
1268
1269                 # Convert "user.somehost.com" to "user [somehost.com]"
1270                 # (also "user.somehost.co.uk")
1271                 if ($display !~ /\[/) {
1272                         $display=~s/^([-a-zA-Z0-9]+?)\.([-.a-zA-Z0-9]+\.[a-z]+)$/$1 [$2]/;
1273                 }
1274                 # Convert "http://somehost.com/user" to "user [somehost.com]".
1275                 # (also "https://somehost.com/user/")
1276                 if ($display !~ /\[/) {
1277                         $display=~s/^https?:\/\/(.+)\/([^\/#?]+)\/?(?:[#?].*)?$/$2 [$1]/;
1278                 }
1279                 $display=~s!^https?://!!; # make sure this is removed
1280                 eval q{use CGI 'escapeHTML'};
1281                 error($@) if $@;
1282                 return escapeHTML($display);
1283         }
1284         return;
1285 }
1286
1287 sub htmlize ($$$$) {
1288         my $page=shift;
1289         my $destpage=shift;
1290         my $type=shift;
1291         my $content=shift;
1292
1293         my $oneline = $content !~ /\n/;
1294
1295         if (exists $hooks{htmlize}{$type}) {
1296                 $content=$hooks{htmlize}{$type}{call}->(
1297                         page => $page,
1298                         content => $content,
1299                 );
1300         }
1301         else {
1302                 error("htmlization of $type not supported");
1303         }
1304
1305         run_hooks(sanitize => sub {
1306                 $content=shift->(
1307                         page => $page,
1308                         destpage => $destpage,
1309                         content => $content,
1310                 );
1311         });
1312
1313         if ($oneline) {
1314                 # hack to get rid of enclosing junk added by markdown
1315                 # and other htmlizers/sanitizers
1316                 $content=~s/^<p>//i;
1317                 $content=~s/<\/p>\n*$//i;
1318         }
1319
1320         return $content;
1321 }
1322
1323 sub linkify ($$$) {
1324         my $page=shift;
1325         my $destpage=shift;
1326         my $content=shift;
1327
1328         run_hooks(linkify => sub {
1329                 $content=shift->(
1330                         page => $page,
1331                         destpage => $destpage,
1332                         content => $content,
1333                 );
1334         });
1335
1336         return $content;
1337 }
1338
1339 our %preprocessing;
1340 our $preprocess_preview=0;
1341 sub preprocess ($$$;$$) {
1342         my $page=shift; # the page the data comes from
1343         my $destpage=shift; # the page the data will appear in (different for inline)
1344         my $content=shift;
1345         my $scan=shift;
1346         my $preview=shift;
1347
1348         # Using local because it needs to be set within any nested calls
1349         # of this function.
1350         local $preprocess_preview=$preview if defined $preview;
1351
1352         my $handle=sub {
1353                 my $escape=shift;
1354                 my $prefix=shift;
1355                 my $command=shift;
1356                 my $params=shift;
1357                 $params="" if ! defined $params;
1358
1359                 if (length $escape) {
1360                         return "[[$prefix$command $params]]";
1361                 }
1362                 elsif (exists $hooks{preprocess}{$command}) {
1363                         return "" if $scan && ! $hooks{preprocess}{$command}{scan};
1364                         # Note: preserve order of params, some plugins may
1365                         # consider it significant.
1366                         my @params;
1367                         while ($params =~ m{
1368                                 (?:([-\w]+)=)?          # 1: named parameter key?
1369                                 (?:
1370                                         """(.*?)"""     # 2: triple-quoted value
1371                                 |
1372                                         "([^"]*?)"      # 3: single-quoted value
1373                                 |
1374                                         (\S+)           # 4: unquoted value
1375                                 )
1376                                 (?:\s+|$)               # delimiter to next param
1377                         }sgx) {
1378                                 my $key=$1;
1379                                 my $val;
1380                                 if (defined $2) {
1381                                         $val=$2;
1382                                         $val=~s/\r\n/\n/mg;
1383                                         $val=~s/^\n+//g;
1384                                         $val=~s/\n+$//g;
1385                                 }
1386                                 elsif (defined $3) {
1387                                         $val=$3;
1388                                 }
1389                                 elsif (defined $4) {
1390                                         $val=$4;
1391                                 }
1392
1393                                 if (defined $key) {
1394                                         push @params, $key, $val;
1395                                 }
1396                                 else {
1397                                         push @params, $val, '';
1398                                 }
1399                         }
1400                         if ($preprocessing{$page}++ > 3) {
1401                                 # Avoid loops of preprocessed pages preprocessing
1402                                 # other pages that preprocess them, etc.
1403                                 return "[[!$command <span class=\"error\">".
1404                                         sprintf(gettext("preprocessing loop detected on %s at depth %i"),
1405                                                 $page, $preprocessing{$page}).
1406                                         "</span>]]";
1407                         }
1408                         my $ret;
1409                         if (! $scan) {
1410                                 $ret=eval {
1411                                         $hooks{preprocess}{$command}{call}->(
1412                                                 @params,
1413                                                 page => $page,
1414                                                 destpage => $destpage,
1415                                                 preview => $preprocess_preview,
1416                                         );
1417                                 };
1418                                 if ($@) {
1419                                         my $error=$@;
1420                                         chomp $error;
1421                                         $ret="[[!$command <span class=\"error\">".
1422                                                 gettext("Error").": $error"."</span>]]";
1423                                 }
1424                         }
1425                         else {
1426                                 # use void context during scan pass
1427                                 eval {
1428                                         $hooks{preprocess}{$command}{call}->(
1429                                                 @params,
1430                                                 page => $page,
1431                                                 destpage => $destpage,
1432                                                 preview => $preprocess_preview,
1433                                         );
1434                                 };
1435                                 $ret="";
1436                         }
1437                         $preprocessing{$page}--;
1438                         return $ret;
1439                 }
1440                 else {
1441                         return "[[$prefix$command $params]]";
1442                 }
1443         };
1444
1445         my $regex;
1446         if ($config{prefix_directives}) {
1447                 $regex = qr{
1448                         (\\?)           # 1: escape?
1449                         \[\[(!)         # directive open; 2: prefix
1450                         ([-\w]+)        # 3: command
1451                         (               # 4: the parameters..
1452                                 \s+     # Must have space if parameters present
1453                                 (?:
1454                                         (?:[-\w]+=)?            # named parameter key?
1455                                         (?:
1456                                                 """.*?"""       # triple-quoted value
1457                                                 |
1458                                                 "[^"]*?"        # single-quoted value
1459                                                 |
1460                                                 [^"\s\]]+       # unquoted value
1461                                         )
1462                                         \s*                     # whitespace or end
1463                                                                 # of directive
1464                                 )
1465                         *)?             # 0 or more parameters
1466                         \]\]            # directive closed
1467                 }sx;
1468         }
1469         else {
1470                 $regex = qr{
1471                         (\\?)           # 1: escape?
1472                         \[\[(!?)        # directive open; 2: optional prefix
1473                         ([-\w]+)        # 3: command
1474                         \s+
1475                         (               # 4: the parameters..
1476                                 (?:
1477                                         (?:[-\w]+=)?            # named parameter key?
1478                                         (?:
1479                                                 """.*?"""       # triple-quoted value
1480                                                 |
1481                                                 "[^"]*?"        # single-quoted value
1482                                                 |
1483                                                 [^"\s\]]+       # unquoted value
1484                                         )
1485                                         \s*                     # whitespace or end
1486                                                                 # of directive
1487                                 )
1488                         *)              # 0 or more parameters
1489                         \]\]            # directive closed
1490                 }sx;
1491         }
1492
1493         $content =~ s{$regex}{$handle->($1, $2, $3, $4)}eg;
1494         return $content;
1495 }
1496
1497 sub filter ($$$) {
1498         my $page=shift;
1499         my $destpage=shift;
1500         my $content=shift;
1501
1502         run_hooks(filter => sub {
1503                 $content=shift->(page => $page, destpage => $destpage,
1504                         content => $content);
1505         });
1506
1507         return $content;
1508 }
1509
1510 sub check_canedit ($$$;$) {
1511         my $page=shift;
1512         my $q=shift;
1513         my $session=shift;
1514         my $nonfatal=shift;
1515
1516         my $canedit;
1517         run_hooks(canedit => sub {
1518                 return if defined $canedit;
1519                 my $ret=shift->($page, $q, $session);
1520                 if (defined $ret) {
1521                         if ($ret eq "") {
1522                                 $canedit=1;
1523                         }
1524                         elsif (ref $ret eq 'CODE') {
1525                                 $ret->() unless $nonfatal;
1526                                 $canedit=0;
1527                         }
1528                         elsif (defined $ret) {
1529                                 error($ret) unless $nonfatal;
1530                                 $canedit=0;
1531                         }
1532                 }
1533         });
1534         return defined $canedit ? $canedit : 1;
1535 }
1536
1537 sub check_content (@) {
1538         my %params=@_;
1539
1540         return 1 if ! exists $hooks{checkcontent}; # optimisation
1541
1542         if (exists $pagesources{$params{page}}) {
1543                 my @diff;
1544                 my %old=map { $_ => 1 }
1545                         split("\n", readfile(srcfile($pagesources{$params{page}})));
1546                 foreach my $line (split("\n", $params{content})) {
1547                         push @diff, $line if ! exists $old{$line};
1548                 }
1549                 $params{diff}=join("\n", @diff);
1550         }
1551
1552         my $ok;
1553         run_hooks(checkcontent => sub {
1554                 return if defined $ok;
1555                 my $ret=shift->(%params);
1556                 if (defined $ret) {
1557                         if ($ret eq "") {
1558                                 $ok=1;
1559                         }
1560                         elsif (ref $ret eq 'CODE') {
1561                                 $ret->() unless $params{nonfatal};
1562                                 $ok=0;
1563                         }
1564                         elsif (defined $ret) {
1565                                 error($ret) unless $params{nonfatal};
1566                                 $ok=0;
1567                         }
1568                 }
1569
1570         });
1571         return defined $ok ? $ok : 1;
1572 }
1573
1574 sub check_canchange (@) {
1575         my %params = @_;
1576         my $cgi = $params{cgi};
1577         my $session = $params{session};
1578         my @changes = @{$params{changes}};
1579
1580         my %newfiles;
1581         foreach my $change (@changes) {
1582                 # This untaint is safe because we check file_pruned and
1583                 # wiki_file_regexp.
1584                 my ($file)=$change->{file}=~/$config{wiki_file_regexp}/;
1585                 $file=possibly_foolish_untaint($file);
1586                 if (! defined $file || ! length $file ||
1587                     file_pruned($file)) {
1588                         error(gettext("bad file name %s"), $file);
1589                 }
1590
1591                 my $type=pagetype($file);
1592                 my $page=pagename($file) if defined $type;
1593
1594                 if ($change->{action} eq 'add') {
1595                         $newfiles{$file}=1;
1596                 }
1597
1598                 if ($change->{action} eq 'change' ||
1599                     $change->{action} eq 'add') {
1600                         if (defined $page) {
1601                                 check_canedit($page, $cgi, $session);
1602                                 next;
1603                         }
1604                         else {
1605                                 if (IkiWiki::Plugin::attachment->can("check_canattach")) {
1606                                         IkiWiki::Plugin::attachment::check_canattach($session, $file, $change->{path});
1607                                         check_canedit($file, $cgi, $session);
1608                                         next;
1609                                 }
1610                         }
1611                 }
1612                 elsif ($change->{action} eq 'remove') {
1613                         # check_canremove tests to see if the file is present
1614                         # on disk. This will fail when a single commit adds a
1615                         # file and then removes it again. Avoid the problem
1616                         # by not testing the removal in such pairs of changes.
1617                         # (The add is still tested, just to make sure that
1618                         # no data is added to the repo that a web edit
1619                         # could not add.)
1620                         next if $newfiles{$file};
1621
1622                         if (IkiWiki::Plugin::remove->can("check_canremove")) {
1623                                 IkiWiki::Plugin::remove::check_canremove(defined $page ? $page : $file, $cgi, $session);
1624                                 check_canedit(defined $page ? $page : $file, $cgi, $session);
1625                                 next;
1626                         }
1627                 }
1628                 else {
1629                         error "unknown action ".$change->{action};
1630                 }
1631
1632                 error sprintf(gettext("you are not allowed to change %s"), $file);
1633         }
1634 }
1635
1636
1637 my $wikilock;
1638
1639 sub lockwiki () {
1640         # Take an exclusive lock on the wiki to prevent multiple concurrent
1641         # run issues. The lock will be dropped on program exit.
1642         if (! -d $config{wikistatedir}) {
1643                 mkdir($config{wikistatedir});
1644         }
1645         open($wikilock, '>', "$config{wikistatedir}/lockfile") ||
1646                 error ("cannot write to $config{wikistatedir}/lockfile: $!");
1647         if (! flock($wikilock, 2)) { # LOCK_EX
1648                 error("failed to get lock");
1649         }
1650         return 1;
1651 }
1652
1653 sub unlockwiki () {
1654         POSIX::close($ENV{IKIWIKI_CGILOCK_FD}) if exists $ENV{IKIWIKI_CGILOCK_FD};
1655         return close($wikilock) if $wikilock;
1656         return;
1657 }
1658
1659 my $commitlock;
1660
1661 sub commit_hook_enabled () {
1662         open($commitlock, '+>', "$config{wikistatedir}/commitlock") ||
1663                 error("cannot write to $config{wikistatedir}/commitlock: $!");
1664         if (! flock($commitlock, 1 | 4)) { # LOCK_SH | LOCK_NB to test
1665                 close($commitlock) || error("failed closing commitlock: $!");
1666                 return 0;
1667         }
1668         close($commitlock) || error("failed closing commitlock: $!");
1669         return 1;
1670 }
1671
1672 sub disable_commit_hook () {
1673         open($commitlock, '>', "$config{wikistatedir}/commitlock") ||
1674                 error("cannot write to $config{wikistatedir}/commitlock: $!");
1675         if (! flock($commitlock, 2)) { # LOCK_EX
1676                 error("failed to get commit lock");
1677         }
1678         return 1;
1679 }
1680
1681 sub enable_commit_hook () {
1682         return close($commitlock) if $commitlock;
1683         return;
1684 }
1685
1686 sub loadindex () {
1687         %oldrenderedfiles=%pagectime=();
1688         if (! $config{rebuild}) {
1689                 %pagesources=%pagemtime=%oldlinks=%links=%depends=
1690                 %destsources=%renderedfiles=%pagecase=%pagestate=
1691                 %depends_simple=%typedlinks=%oldtypedlinks=();
1692         }
1693         my $in;
1694         if (! open ($in, "<", "$config{wikistatedir}/indexdb")) {
1695                 if (-e "$config{wikistatedir}/index") {
1696                         system("ikiwiki-transition", "indexdb", $config{srcdir});
1697                         open ($in, "<", "$config{wikistatedir}/indexdb") || return;
1698                 }
1699                 else {
1700                         $config{gettime}=1; # first build
1701                         return;
1702                 }
1703         }
1704
1705         my $index=Storable::fd_retrieve($in);
1706         if (! defined $index) {
1707                 return 0;
1708         }
1709
1710         my $pages;
1711         if (exists $index->{version} && ! ref $index->{version}) {
1712                 $pages=$index->{page};
1713                 %wikistate=%{$index->{state}};
1714                 # Handle plugins that got disabled by loading a new setup.
1715                 if (exists $config{setupfile}) {
1716                         require IkiWiki::Setup;
1717                         IkiWiki::Setup::disabled_plugins(
1718                                 grep { ! $loaded_plugins{$_} } keys %wikistate);
1719                 }
1720         }
1721         else {
1722                 $pages=$index;
1723                 %wikistate=();
1724         }
1725
1726         foreach my $src (keys %$pages) {
1727                 my $d=$pages->{$src};
1728                 my $page=pagename($src);
1729                 $pagectime{$page}=$d->{ctime};
1730                 $pagesources{$page}=$src;
1731                 if (! $config{rebuild}) {
1732                         $pagemtime{$page}=$d->{mtime};
1733                         $renderedfiles{$page}=$d->{dest};
1734                         if (exists $d->{links} && ref $d->{links}) {
1735                                 $links{$page}=$d->{links};
1736                                 $oldlinks{$page}=[@{$d->{links}}];
1737                         }
1738                         if (ref $d->{depends_simple} eq 'ARRAY') {
1739                                 # old format
1740                                 $depends_simple{$page}={
1741                                         map { $_ => 1 } @{$d->{depends_simple}}
1742                                 };
1743                         }
1744                         elsif (exists $d->{depends_simple}) {
1745                                 $depends_simple{$page}=$d->{depends_simple};
1746                         }
1747                         if (exists $d->{dependslist}) {
1748                                 # old format
1749                                 $depends{$page}={
1750                                         map { $_ => $DEPEND_CONTENT }
1751                                                 @{$d->{dependslist}}
1752                                 };
1753                         }
1754                         elsif (exists $d->{depends} && ! ref $d->{depends}) {
1755                                 # old format
1756                                 $depends{$page}={$d->{depends} => $DEPEND_CONTENT };
1757                         }
1758                         elsif (exists $d->{depends}) {
1759                                 $depends{$page}=$d->{depends};
1760                         }
1761                         if (exists $d->{state}) {
1762                                 $pagestate{$page}=$d->{state};
1763                         }
1764                         if (exists $d->{typedlinks}) {
1765                                 $typedlinks{$page}=$d->{typedlinks};
1766
1767                                 while (my ($type, $links) = each %{$typedlinks{$page}}) {
1768                                         next unless %$links;
1769                                         $oldtypedlinks{$page}{$type} = {%$links};
1770                                 }
1771                         }
1772                 }
1773                 $oldrenderedfiles{$page}=[@{$d->{dest}}];
1774         }
1775         foreach my $page (keys %pagesources) {
1776                 $pagecase{lc $page}=$page;
1777         }
1778         foreach my $page (keys %renderedfiles) {
1779                 $destsources{$_}=$page foreach @{$renderedfiles{$page}};
1780         }
1781         return close($in);
1782 }
1783
1784 sub saveindex () {
1785         run_hooks(savestate => sub { shift->() });
1786
1787         my @plugins=keys %loaded_plugins;
1788
1789         if (! -d $config{wikistatedir}) {
1790                 mkdir($config{wikistatedir});
1791         }
1792         my $newfile="$config{wikistatedir}/indexdb.new";
1793         my $cleanup = sub { unlink($newfile) };
1794         open (my $out, '>', $newfile) || error("cannot write to $newfile: $!", $cleanup);
1795
1796         my %index;
1797         foreach my $page (keys %pagemtime) {
1798                 next unless $pagemtime{$page};
1799                 my $src=$pagesources{$page};
1800
1801                 $index{page}{$src}={
1802                         ctime => $pagectime{$page},
1803                         mtime => $pagemtime{$page},
1804                         dest => $renderedfiles{$page},
1805                         links => $links{$page},
1806                 };
1807
1808                 if (exists $depends{$page}) {
1809                         $index{page}{$src}{depends} = $depends{$page};
1810                 }
1811
1812                 if (exists $depends_simple{$page}) {
1813                         $index{page}{$src}{depends_simple} = $depends_simple{$page};
1814                 }
1815
1816                 if (exists $typedlinks{$page} && %{$typedlinks{$page}}) {
1817                         $index{page}{$src}{typedlinks} = $typedlinks{$page};
1818                 }
1819
1820                 if (exists $pagestate{$page}) {
1821                         foreach my $id (@plugins) {
1822                                 foreach my $key (keys %{$pagestate{$page}{$id}}) {
1823                                         $index{page}{$src}{state}{$id}{$key}=$pagestate{$page}{$id}{$key};
1824                                 }
1825                         }
1826                 }
1827         }
1828
1829         $index{state}={};
1830         foreach my $id (@plugins) {
1831                 $index{state}{$id}={}; # used to detect disabled plugins
1832                 foreach my $key (keys %{$wikistate{$id}}) {
1833                         $index{state}{$id}{$key}=$wikistate{$id}{$key};
1834                 }
1835         }
1836
1837         $index{version}="3";
1838         my $ret=Storable::nstore_fd(\%index, $out);
1839         return if ! defined $ret || ! $ret;
1840         close $out || error("failed saving to $newfile: $!", $cleanup);
1841         rename($newfile, "$config{wikistatedir}/indexdb") ||
1842                 error("failed renaming $newfile to $config{wikistatedir}/indexdb", $cleanup);
1843
1844         return 1;
1845 }
1846
1847 sub template_file ($) {
1848         my $name=shift;
1849
1850         my $tpage=($name =~ s/^\///) ? $name : "templates/$name";
1851         my $template;
1852         if ($name !~ /\.tmpl$/ && exists $pagesources{$tpage}) {
1853                 $template=srcfile($pagesources{$tpage}, 1);
1854                 $name.=".tmpl";
1855         }
1856         else {
1857                 $template=srcfile($tpage, 1);
1858         }
1859
1860         if (defined $template) {
1861                 return $template, $tpage, 1 if wantarray;
1862                 return $template;
1863         }
1864         else {
1865                 $name=~s:/::; # avoid path traversal
1866                 foreach my $dir ($config{templatedir},
1867                                  "$installdir/share/ikiwiki/templates") {
1868                         if (-e "$dir/$name") {
1869                                 $template="$dir/$name";
1870                                 last;
1871                         }
1872                 }
1873                 if (defined $template) {
1874                         return $template, $tpage if wantarray;
1875                         return $template;
1876                 }
1877         }
1878
1879         return;
1880 }
1881
1882 sub template_depends ($$;@) {
1883         my $name=shift;
1884         my $page=shift;
1885
1886         my ($filename, $tpage, $untrusted)=template_file($name);
1887         if (! defined $filename) {
1888                 error(sprintf(gettext("template %s not found"), $name))
1889         }
1890
1891         if (defined $page && defined $tpage) {
1892                 add_depends($page, $tpage);
1893         }
1894
1895         my @opts=(
1896                 filter => sub {
1897                         my $text_ref = shift;
1898                         ${$text_ref} = decode_utf8(${$text_ref});
1899                 },
1900                 loop_context_vars => 1,
1901                 die_on_bad_params => 0,
1902                 parent_global_vars => 1,
1903                 filename => $filename,
1904                 @_,
1905                 ($untrusted ? (no_includes => 1) : ()),
1906         );
1907         return @opts if wantarray;
1908
1909         require HTML::Template;
1910         return HTML::Template->new(@opts);
1911 }
1912
1913 sub template ($;@) {
1914         template_depends(shift, undef, @_);
1915 }
1916
1917 sub misctemplate ($$;@) {
1918         my $title=shift;
1919         my $content=shift;
1920         my %params=@_;
1921
1922         my $template=template("page.tmpl");
1923
1924         my $page="";
1925         if (exists $params{page}) {
1926                 $page=delete $params{page};
1927         }
1928         run_hooks(pagetemplate => sub {
1929                 shift->(
1930                         page => $page,
1931                         destpage => $page,
1932                         template => $template,
1933                 );
1934         });
1935         templateactions($template, "");
1936
1937         $template->param(
1938                 dynamic => 1,
1939                 title => $title,
1940                 wikiname => $config{wikiname},
1941                 content => $content,
1942                 baseurl => $config{url}.'/',
1943                 html5 => $config{html5},
1944                 %params,
1945         );
1946
1947         return $template->output;
1948 }
1949
1950 sub templateactions ($$) {
1951         my $template=shift;
1952         my $page=shift;
1953
1954         my $have_actions=0;
1955         my @actions;
1956         run_hooks(pageactions => sub {
1957                 push @actions, map { { action => $_ } }
1958                         grep { defined } shift->(page => $page);
1959         });
1960         $template->param(actions => \@actions);
1961
1962         if ($config{cgiurl} && exists $hooks{auth}) {
1963                 $template->param(prefsurl => cgiurl(do => "prefs"));
1964                 $have_actions=1;
1965         }
1966
1967         if ($have_actions || @actions) {
1968                 $template->param(have_actions => 1);
1969         }
1970 }
1971
1972 sub hook (@) {
1973         my %param=@_;
1974
1975         if (! exists $param{type} || ! ref $param{call} || ! exists $param{id}) {
1976                 error 'hook requires type, call, and id parameters';
1977         }
1978
1979         return if $param{no_override} && exists $hooks{$param{type}}{$param{id}};
1980
1981         $hooks{$param{type}}{$param{id}}=\%param;
1982         return 1;
1983 }
1984
1985 sub run_hooks ($$) {
1986         # Calls the given sub for each hook of the given type,
1987         # passing it the hook function to call.
1988         my $type=shift;
1989         my $sub=shift;
1990
1991         if (exists $hooks{$type}) {
1992                 my (@first, @middle, @last);
1993                 foreach my $id (keys %{$hooks{$type}}) {
1994                         if ($hooks{$type}{$id}{first}) {
1995                                 push @first, $id;
1996                         }
1997                         elsif ($hooks{$type}{$id}{last}) {
1998                                 push @last, $id;
1999                         }
2000                         else {
2001                                 push @middle, $id;
2002                         }
2003                 }
2004                 foreach my $id (@first, @middle, @last) {
2005                         $sub->($hooks{$type}{$id}{call});
2006                 }
2007         }
2008
2009         return 1;
2010 }
2011
2012 sub rcs_update () {
2013         $hooks{rcs}{rcs_update}{call}->(@_);
2014 }
2015
2016 sub rcs_prepedit ($) {
2017         $hooks{rcs}{rcs_prepedit}{call}->(@_);
2018 }
2019
2020 sub rcs_commit (@) {
2021         $hooks{rcs}{rcs_commit}{call}->(@_);
2022 }
2023
2024 sub rcs_commit_staged (@) {
2025         $hooks{rcs}{rcs_commit_staged}{call}->(@_);
2026 }
2027
2028 sub rcs_add ($) {
2029         $hooks{rcs}{rcs_add}{call}->(@_);
2030 }
2031
2032 sub rcs_remove ($) {
2033         $hooks{rcs}{rcs_remove}{call}->(@_);
2034 }
2035
2036 sub rcs_rename ($$) {
2037         $hooks{rcs}{rcs_rename}{call}->(@_);
2038 }
2039
2040 sub rcs_recentchanges ($) {
2041         $hooks{rcs}{rcs_recentchanges}{call}->(@_);
2042 }
2043
2044 sub rcs_diff ($;$) {
2045         $hooks{rcs}{rcs_diff}{call}->(@_);
2046 }
2047
2048 sub rcs_getctime ($) {
2049         $hooks{rcs}{rcs_getctime}{call}->(@_);
2050 }
2051
2052 sub rcs_getmtime ($) {
2053         $hooks{rcs}{rcs_getmtime}{call}->(@_);
2054 }
2055
2056 sub rcs_receive () {
2057         $hooks{rcs}{rcs_receive}{call}->();
2058 }
2059
2060 sub add_depends ($$;$) {
2061         my $page=shift;
2062         my $pagespec=shift;
2063         my $deptype=shift || $DEPEND_CONTENT;
2064
2065         # Is the pagespec a simple page name?
2066         if ($pagespec =~ /$config{wiki_file_regexp}/ &&
2067             $pagespec !~ /[\s*?()!]/) {
2068                 $depends_simple{$page}{lc $pagespec} |= $deptype;
2069                 return 1;
2070         }
2071
2072         # Add explicit dependencies for influences.
2073         my $sub=pagespec_translate($pagespec);
2074         return unless defined $sub;
2075         foreach my $p (keys %pagesources) {
2076                 my $r=$sub->($p, location => $page);
2077                 my $i=$r->influences;
2078                 my $static=$r->influences_static;
2079                 foreach my $k (keys %$i) {
2080                         next unless $r || $static || $k eq $page;
2081                         $depends_simple{$page}{lc $k} |= $i->{$k};
2082                 }
2083                 last if $static;
2084         }
2085
2086         $depends{$page}{$pagespec} |= $deptype;
2087         return 1;
2088 }
2089
2090 sub deptype (@) {
2091         my $deptype=0;
2092         foreach my $type (@_) {
2093                 if ($type eq 'presence') {
2094                         $deptype |= $DEPEND_PRESENCE;
2095                 }
2096                 elsif ($type eq 'links') {
2097                         $deptype |= $DEPEND_LINKS;
2098                 }
2099                 elsif ($type eq 'content') {
2100                         $deptype |= $DEPEND_CONTENT;
2101                 }
2102         }
2103         return $deptype;
2104 }
2105
2106 my $file_prune_regexp;
2107 sub file_pruned ($) {
2108         my $file=shift;
2109
2110         if (defined $config{include} && length $config{include}) {
2111                 return 0 if $file =~ m/$config{include}/;
2112         }
2113
2114         if (! defined $file_prune_regexp) {
2115                 $file_prune_regexp='('.join('|', @{$config{wiki_file_prune_regexps}}).')';
2116                 $file_prune_regexp=qr/$file_prune_regexp/;
2117         }
2118         return $file =~ m/$file_prune_regexp/;
2119 }
2120
2121 sub define_gettext () {
2122         # If translation is needed, redefine the gettext function to do it.
2123         # Otherwise, it becomes a quick no-op.
2124         my $gettext_obj;
2125         my $getobj;
2126         if ((exists $ENV{LANG} && length $ENV{LANG}) ||
2127             (exists $ENV{LC_ALL} && length $ENV{LC_ALL}) ||
2128             (exists $ENV{LC_MESSAGES} && length $ENV{LC_MESSAGES})) {
2129                 $getobj=sub {
2130                         $gettext_obj=eval q{
2131                                 use Locale::gettext q{textdomain};
2132                                 Locale::gettext->domain('ikiwiki')
2133                         };
2134                 };
2135         }
2136
2137         no warnings 'redefine';
2138         *gettext=sub {
2139                 $getobj->() if $getobj;
2140                 if ($gettext_obj) {
2141                         $gettext_obj->get(shift);
2142                 }
2143                 else {
2144                         return shift;
2145                 }
2146         };
2147         *ngettext=sub {
2148                 $getobj->() if $getobj;
2149                 if ($gettext_obj) {
2150                         $gettext_obj->nget(@_);
2151                 }
2152                 else {
2153                         return ($_[2] == 1 ? $_[0] : $_[1])
2154                 }
2155         };
2156 }
2157
2158 sub gettext {
2159         define_gettext();
2160         gettext(@_);
2161 }
2162
2163 sub ngettext {
2164         define_gettext();
2165         ngettext(@_);
2166 }
2167
2168 sub yesno ($) {
2169         my $val=shift;
2170
2171         return (defined $val && (lc($val) eq gettext("yes") || lc($val) eq "yes" || $val eq "1"));
2172 }
2173
2174 sub inject {
2175         # Injects a new function into the symbol table to replace an
2176         # exported function.
2177         my %params=@_;
2178
2179         # This is deep ugly perl foo, beware.
2180         no strict;
2181         no warnings;
2182         if (! defined $params{parent}) {
2183                 $params{parent}='::';
2184                 $params{old}=\&{$params{name}};
2185                 $params{name}=~s/.*:://;
2186         }
2187         my $parent=$params{parent};
2188         foreach my $ns (grep /^\w+::/, keys %{$parent}) {
2189                 $ns = $params{parent} . $ns;
2190                 inject(%params, parent => $ns) unless $ns eq '::main::';
2191                 *{$ns . $params{name}} = $params{call}
2192                         if exists ${$ns}{$params{name}} &&
2193                            \&{${$ns}{$params{name}}} == $params{old};
2194         }
2195         use strict;
2196         use warnings;
2197 }
2198
2199 sub add_link ($$;$) {
2200         my $page=shift;
2201         my $link=shift;
2202         my $type=shift;
2203
2204         push @{$links{$page}}, $link
2205                 unless grep { $_ eq $link } @{$links{$page}};
2206
2207         if (defined $type) {
2208                 $typedlinks{$page}{$type}{$link} = 1;
2209         }
2210 }
2211
2212 sub add_autofile ($$$) {
2213         my $file=shift;
2214         my $plugin=shift;
2215         my $generator=shift;
2216
2217         $autofiles{$file}{plugin}=$plugin;
2218         $autofiles{$file}{generator}=$generator;
2219 }
2220
2221 sub sortspec_translate ($$) {
2222         my $spec = shift;
2223         my $reverse = shift;
2224
2225         my $code = "";
2226         my @data;
2227         while ($spec =~ m{
2228                 \s*
2229                 (-?)            # group 1: perhaps negated
2230                 \s*
2231                 (               # group 2: a word
2232                         \w+\([^\)]*\)   # command(params)
2233                         |
2234                         [^\s]+          # or anything else
2235                 )
2236                 \s*
2237         }gx) {
2238                 my $negated = $1;
2239                 my $word = $2;
2240                 my $params = undef;
2241
2242                 if ($word =~ m/^(\w+)\((.*)\)$/) {
2243                         # command with parameters
2244                         $params = $2;
2245                         $word = $1;
2246                 }
2247                 elsif ($word !~ m/^\w+$/) {
2248                         error(sprintf(gettext("invalid sort type %s"), $word));
2249                 }
2250
2251                 if (length $code) {
2252                         $code .= " || ";
2253                 }
2254
2255                 if ($negated) {
2256                         $code .= "-";
2257                 }
2258
2259                 if (exists $IkiWiki::SortSpec::{"cmp_$word"}) {
2260                         if (defined $params) {
2261                                 push @data, $params;
2262                                 $code .= "IkiWiki::SortSpec::cmp_$word(\$data[$#data])";
2263                         }
2264                         else {
2265                                 $code .= "IkiWiki::SortSpec::cmp_$word(undef)";
2266                         }
2267                 }
2268                 else {
2269                         error(sprintf(gettext("unknown sort type %s"), $word));
2270                 }
2271         }
2272
2273         if (! length $code) {
2274                 # undefined sorting method... sort arbitrarily
2275                 return sub { 0 };
2276         }
2277
2278         if ($reverse) {
2279                 $code="-($code)";
2280         }
2281
2282         no warnings;
2283         return eval 'sub { '.$code.' }';
2284 }
2285
2286 sub pagespec_translate ($) {
2287         my $spec=shift;
2288
2289         # Convert spec to perl code.
2290         my $code="";
2291         my @data;
2292         while ($spec=~m{
2293                 \s*             # ignore whitespace
2294                 (               # 1: match a single word
2295                         \!              # !
2296                 |
2297                         \(              # (
2298                 |
2299                         \)              # )
2300                 |
2301                         \w+\([^\)]*\)   # command(params)
2302                 |
2303                         [^\s()]+        # any other text
2304                 )
2305                 \s*             # ignore whitespace
2306         }gx) {
2307                 my $word=$1;
2308                 if (lc $word eq 'and') {
2309                         $code.=' &';
2310                 }
2311                 elsif (lc $word eq 'or') {
2312                         $code.=' |';
2313                 }
2314                 elsif ($word eq "(" || $word eq ")" || $word eq "!") {
2315                         $code.=' '.$word;
2316                 }
2317                 elsif ($word =~ /^(\w+)\((.*)\)$/) {
2318                         if (exists $IkiWiki::PageSpec::{"match_$1"}) {
2319                                 push @data, $2;
2320                                 $code.="IkiWiki::PageSpec::match_$1(\$page, \$data[$#data], \@_)";
2321                         }
2322                         else {
2323                                 push @data, qq{unknown function in pagespec "$word"};
2324                                 $code.="IkiWiki::ErrorReason->new(\$data[$#data])";
2325                         }
2326                 }
2327                 else {
2328                         push @data, $word;
2329                         $code.=" IkiWiki::PageSpec::match_glob(\$page, \$data[$#data], \@_)";
2330                 }
2331         }
2332
2333         if (! length $code) {
2334                 $code="IkiWiki::FailReason->new('empty pagespec')";
2335         }
2336
2337         no warnings;
2338         return eval 'sub { my $page=shift; '.$code.' }';
2339 }
2340
2341 sub pagespec_match ($$;@) {
2342         my $page=shift;
2343         my $spec=shift;
2344         my @params=@_;
2345
2346         # Backwards compatability with old calling convention.
2347         if (@params == 1) {
2348                 unshift @params, 'location';
2349         }
2350
2351         my $sub=pagespec_translate($spec);
2352         return IkiWiki::ErrorReason->new("syntax error in pagespec \"$spec\"")
2353                 if ! defined $sub;
2354         return $sub->($page, @params);
2355 }
2356
2357 sub pagespec_match_list ($$;@) {
2358         my $page=shift;
2359         my $pagespec=shift;
2360         my %params=@_;
2361
2362         # Backwards compatability with old calling convention.
2363         if (ref $page) {
2364                 print STDERR "warning: a plugin (".caller().") is using pagespec_match_list in an obsolete way, and needs to be updated\n";
2365                 $params{list}=$page;
2366                 $page=$params{location}; # ugh!
2367         }
2368
2369         my $sub=pagespec_translate($pagespec);
2370         error "syntax error in pagespec \"$pagespec\""
2371                 if ! defined $sub;
2372         my $sort=sortspec_translate($params{sort}, $params{reverse})
2373                 if defined $params{sort};
2374
2375         my @candidates;
2376         if (exists $params{list}) {
2377                 @candidates=exists $params{filter}
2378                         ? grep { ! $params{filter}->($_) } @{$params{list}}
2379                         : @{$params{list}};
2380         }
2381         else {
2382                 @candidates=exists $params{filter}
2383                         ? grep { ! $params{filter}->($_) } keys %pagesources
2384                         : keys %pagesources;
2385         }
2386
2387         # clear params, remainder is passed to pagespec
2388         $depends{$page}{$pagespec} |= ($params{deptype} || $DEPEND_CONTENT);
2389         my $num=$params{num};
2390         delete @params{qw{num deptype reverse sort filter list}};
2391
2392         # when only the top matches will be returned, it's efficient to
2393         # sort before matching to pagespec,
2394         if (defined $num && defined $sort) {
2395                 @candidates=IkiWiki::SortSpec::sort_pages(
2396                         $sort, @candidates);
2397         }
2398
2399         my @matches;
2400         my $firstfail;
2401         my $count=0;
2402         my $accum=IkiWiki::SuccessReason->new();
2403         foreach my $p (@candidates) {
2404                 my $r=$sub->($p, %params, location => $page);
2405                 error(sprintf(gettext("cannot match pages: %s"), $r))
2406                         if $r->isa("IkiWiki::ErrorReason");
2407                 unless ($r || $r->influences_static) {
2408                         $r->remove_influence($p);
2409                 }
2410                 $accum |= $r;
2411                 if ($r) {
2412                         push @matches, $p;
2413                         last if defined $num && ++$count == $num;
2414                 }
2415         }
2416
2417         # Add simple dependencies for accumulated influences.
2418         my $i=$accum->influences;
2419         foreach my $k (keys %$i) {
2420                 $depends_simple{$page}{lc $k} |= $i->{$k};
2421         }
2422
2423         # when all matches will be returned, it's efficient to
2424         # sort after matching
2425         if (! defined $num && defined $sort) {
2426                 return IkiWiki::SortSpec::sort_pages(
2427                         $sort, @matches);
2428         }
2429         else {
2430                 return @matches;
2431         }
2432 }
2433
2434 sub pagespec_valid ($) {
2435         my $spec=shift;
2436
2437         return defined pagespec_translate($spec);
2438 }
2439
2440 sub glob2re ($) {
2441         my $re=quotemeta(shift);
2442         $re=~s/\\\*/.*/g;
2443         $re=~s/\\\?/./g;
2444         return qr/^$re$/i;
2445 }
2446
2447 package IkiWiki::FailReason;
2448
2449 use overload (
2450         '""'    => sub { $_[0][0] },
2451         '0+'    => sub { 0 },
2452         '!'     => sub { bless $_[0], 'IkiWiki::SuccessReason'},
2453         '&'     => sub { $_[0]->merge_influences($_[1], 1); $_[0] },
2454         '|'     => sub { $_[1]->merge_influences($_[0]); $_[1] },
2455         fallback => 1,
2456 );
2457
2458 our @ISA = 'IkiWiki::SuccessReason';
2459
2460 package IkiWiki::SuccessReason;
2461
2462 use overload (
2463         '""'    => sub { $_[0][0] },
2464         '0+'    => sub { 1 },
2465         '!'     => sub { bless $_[0], 'IkiWiki::FailReason'},
2466         '&'     => sub { $_[1]->merge_influences($_[0], 1); $_[1] },
2467         '|'     => sub { $_[0]->merge_influences($_[1]); $_[0] },
2468         fallback => 1,
2469 );
2470
2471 sub new {
2472         my $class = shift;
2473         my $value = shift;
2474         return bless [$value, {@_}], $class;
2475 }
2476
2477 sub influences {
2478         my $this=shift;
2479         $this->[1]={@_} if @_;
2480         my %i=%{$this->[1]};
2481         delete $i{""};
2482         return \%i;
2483 }
2484
2485 sub influences_static {
2486         return ! $_[0][1]->{""};
2487 }
2488
2489 sub merge_influences {
2490         my $this=shift;
2491         my $other=shift;
2492         my $anded=shift;
2493
2494         if (! $anded || (($this || %{$this->[1]}) &&
2495                          ($other || %{$other->[1]}))) {
2496                 foreach my $influence (keys %{$other->[1]}) {
2497                         $this->[1]{$influence} |= $other->[1]{$influence};
2498                 }
2499         }
2500         else {
2501                 # influence blocker
2502                 $this->[1]={};
2503         }
2504 }
2505
2506 sub remove_influence {
2507         my $this=shift;
2508         my $torm=shift;
2509
2510         delete $this->[1]{$torm};
2511 }
2512
2513 package IkiWiki::ErrorReason;
2514
2515 our @ISA = 'IkiWiki::FailReason';
2516
2517 package IkiWiki::PageSpec;
2518
2519 sub derel ($$) {
2520         my $path=shift;
2521         my $from=shift;
2522
2523         if ($path =~ m!^\.(/|$)!) {
2524                 if ($1) {
2525                         $from=~s#/?[^/]+$## if defined $from;
2526                         $path=~s#^\./##;
2527                         $path="$from/$path" if defined $from && length $from;
2528                 }
2529                 else {
2530                         $path = $from;
2531                         $path = "" unless defined $path;
2532                 }
2533         }
2534
2535         return $path;
2536 }
2537
2538 my %glob_cache;
2539
2540 sub match_glob ($$;@) {
2541         my $page=shift;
2542         my $glob=shift;
2543         my %params=@_;
2544
2545         $glob=derel($glob, $params{location});
2546
2547         # Instead of converting the glob to a regex every time,
2548         # cache the compiled regex to save time.
2549         my $re=$glob_cache{$glob};
2550         unless (defined $re) {
2551                 $glob_cache{$glob} = $re = IkiWiki::glob2re($glob);
2552         }
2553         if ($page =~ $re) {
2554                 if (! IkiWiki::isinternal($page) || $params{internal}) {
2555                         return IkiWiki::SuccessReason->new("$glob matches $page");
2556                 }
2557                 else {
2558                         return IkiWiki::FailReason->new("$glob matches $page, but the page is an internal page");
2559                 }
2560         }
2561         else {
2562                 return IkiWiki::FailReason->new("$glob does not match $page");
2563         }
2564 }
2565
2566 sub match_internal ($$;@) {
2567         return match_glob(shift, shift, @_, internal => 1)
2568 }
2569
2570 sub match_page ($$;@) {
2571         my $page=shift;
2572         my $match=match_glob($page, shift, @_);
2573         if ($match) {
2574                 my $source=exists $IkiWiki::pagesources{$page} ?
2575                         $IkiWiki::pagesources{$page} :
2576                         $IkiWiki::delpagesources{$page};
2577                 my $type=defined $source ? IkiWiki::pagetype($source) : undef;
2578                 if (! defined $type) {
2579                         return IkiWiki::FailReason->new("$page is not a page");
2580                 }
2581         }
2582         return $match;
2583 }
2584
2585 sub match_link ($$;@) {
2586         my $page=shift;
2587         my $link=lc(shift);
2588         my %params=@_;
2589
2590         $link=derel($link, $params{location});
2591         my $from=exists $params{location} ? $params{location} : '';
2592         my $linktype=$params{linktype};
2593         my $qualifier='';
2594         if (defined $linktype) {
2595                 $qualifier=" with type $linktype";
2596         }
2597
2598         my $links = $IkiWiki::links{$page};
2599         return IkiWiki::FailReason->new("$page has no links", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2600                 unless $links && @{$links};
2601         my $bestlink = IkiWiki::bestlink($from, $link);
2602         foreach my $p (@{$links}) {
2603                 next unless (! defined $linktype || exists $IkiWiki::typedlinks{$page}{$linktype}{$p});
2604
2605                 if (length $bestlink) {
2606                         if ($bestlink eq IkiWiki::bestlink($page, $p)) {
2607                                 return IkiWiki::SuccessReason->new("$page links to $link$qualifier", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2608                         }
2609                 }
2610                 else {
2611                         if (match_glob($p, $link, %params)) {
2612                                 return IkiWiki::SuccessReason->new("$page links to page $p$qualifier, matching $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2613                         }
2614                         my ($p_rel)=$p=~/^\/?(.*)/;
2615                         $link=~s/^\///;
2616                         if (match_glob($p_rel, $link, %params)) {
2617                                 return IkiWiki::SuccessReason->new("$page links to page $p_rel$qualifier, matching $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2618                         }
2619                 }
2620         }
2621         return IkiWiki::FailReason->new("$page does not link to $link$qualifier", $page => $IkiWiki::DEPEND_LINKS, "" => 1);
2622 }
2623
2624 sub match_backlink ($$;@) {
2625         my $ret=match_link($_[1], $_[0], @_);
2626         $ret->influences($_[1] => $IkiWiki::DEPEND_LINKS);
2627         return $ret;
2628 }
2629
2630 sub match_created_before ($$;@) {
2631         my $page=shift;
2632         my $testpage=shift;
2633         my %params=@_;
2634
2635         $testpage=derel($testpage, $params{location});
2636
2637         if (exists $IkiWiki::pagectime{$testpage}) {
2638                 if ($IkiWiki::pagectime{$page} < $IkiWiki::pagectime{$testpage}) {
2639                         return IkiWiki::SuccessReason->new("$page created before $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2640                 }
2641                 else {
2642                         return IkiWiki::FailReason->new("$page not created before $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2643                 }
2644         }
2645         else {
2646                 return IkiWiki::ErrorReason->new("$testpage does not exist", $testpage => $IkiWiki::DEPEND_PRESENCE);
2647         }
2648 }
2649
2650 sub match_created_after ($$;@) {
2651         my $page=shift;
2652         my $testpage=shift;
2653         my %params=@_;
2654
2655         $testpage=derel($testpage, $params{location});
2656
2657         if (exists $IkiWiki::pagectime{$testpage}) {
2658                 if ($IkiWiki::pagectime{$page} > $IkiWiki::pagectime{$testpage}) {
2659                         return IkiWiki::SuccessReason->new("$page created after $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2660                 }
2661                 else {
2662                         return IkiWiki::FailReason->new("$page not created after $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2663                 }
2664         }
2665         else {
2666                 return IkiWiki::ErrorReason->new("$testpage does not exist", $testpage => $IkiWiki::DEPEND_PRESENCE);
2667         }
2668 }
2669
2670 sub match_creation_day ($$;@) {
2671         my $page=shift;
2672         my $d=shift;
2673         if ($d !~ /^\d+$/) {
2674                 return IkiWiki::ErrorReason->new("invalid day $d");
2675         }
2676         if ((localtime($IkiWiki::pagectime{$page}))[3] == $d) {
2677                 return IkiWiki::SuccessReason->new('creation_day matched');
2678         }
2679         else {
2680                 return IkiWiki::FailReason->new('creation_day did not match');
2681         }
2682 }
2683
2684 sub match_creation_month ($$;@) {
2685         my $page=shift;
2686         my $m=shift;
2687         if ($m !~ /^\d+$/) {
2688                 return IkiWiki::ErrorReason->new("invalid month $m");
2689         }
2690         if ((localtime($IkiWiki::pagectime{$page}))[4] + 1 == $m) {
2691                 return IkiWiki::SuccessReason->new('creation_month matched');
2692         }
2693         else {
2694                 return IkiWiki::FailReason->new('creation_month did not match');
2695         }
2696 }
2697
2698 sub match_creation_year ($$;@) {
2699         my $page=shift;
2700         my $y=shift;
2701         if ($y !~ /^\d+$/) {
2702                 return IkiWiki::ErrorReason->new("invalid year $y");
2703         }
2704         if ((localtime($IkiWiki::pagectime{$page}))[5] + 1900 == $y) {
2705                 return IkiWiki::SuccessReason->new('creation_year matched');
2706         }
2707         else {
2708                 return IkiWiki::FailReason->new('creation_year did not match');
2709         }
2710 }
2711
2712 sub match_user ($$;@) {
2713         shift;
2714         my $user=shift;
2715         my %params=@_;
2716
2717         my $regexp=IkiWiki::glob2re($user);
2718
2719         if (! exists $params{user}) {
2720                 return IkiWiki::ErrorReason->new("no user specified");
2721         }
2722
2723         if (defined $params{user} && $params{user}=~$regexp) {
2724                 return IkiWiki::SuccessReason->new("user is $user");
2725         }
2726         elsif (! defined $params{user}) {
2727                 return IkiWiki::FailReason->new("not logged in");
2728         }
2729         else {
2730                 return IkiWiki::FailReason->new("user is $params{user}, not $user");
2731         }
2732 }
2733
2734 sub match_admin ($$;@) {
2735         shift;
2736         shift;
2737         my %params=@_;
2738
2739         if (! exists $params{user}) {
2740                 return IkiWiki::ErrorReason->new("no user specified");
2741         }
2742
2743         if (defined $params{user} && IkiWiki::is_admin($params{user})) {
2744                 return IkiWiki::SuccessReason->new("user is an admin");
2745         }
2746         elsif (! defined $params{user}) {
2747                 return IkiWiki::FailReason->new("not logged in");
2748         }
2749         else {
2750                 return IkiWiki::FailReason->new("user is not an admin");
2751         }
2752 }
2753
2754 sub match_ip ($$;@) {
2755         shift;
2756         my $ip=shift;
2757         my %params=@_;
2758
2759         if (! exists $params{ip}) {
2760                 return IkiWiki::ErrorReason->new("no IP specified");
2761         }
2762
2763         if (defined $params{ip} && lc $params{ip} eq lc $ip) {
2764                 return IkiWiki::SuccessReason->new("IP is $ip");
2765         }
2766         else {
2767                 return IkiWiki::FailReason->new("IP is $params{ip}, not $ip");
2768         }
2769 }
2770
2771 package IkiWiki::SortSpec;
2772
2773 # This is in the SortSpec namespace so that the $a and $b that sort() uses
2774 # are easily available in this namespace, for cmp functions to use them.
2775 sub sort_pages {
2776         my $f=shift;
2777         sort $f @_
2778 }
2779
2780 sub cmp_title {
2781         IkiWiki::pagetitle(IkiWiki::basename($a))
2782         cmp
2783         IkiWiki::pagetitle(IkiWiki::basename($b))
2784 }
2785
2786 sub cmp_mtime { $IkiWiki::pagemtime{$b} <=> $IkiWiki::pagemtime{$a} }
2787 sub cmp_age { $IkiWiki::pagectime{$b} <=> $IkiWiki::pagectime{$a} }
2788
2789 1