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 strftime_utf8 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         cgi_overload_delay => {
 122                 type => "string",
 123                 default => '',
 124                 example => "10",
 125                 description => "number of seconds to delay CGI requests when overloaded",
 126                 safe => 1,
 127                 rebuild => 0,
 128         },
 129         cgi_overload_message => {
 130                 type => "string",
 131                 default => '',
 132                 example => "Please wait",
 133                 description => "message to display when overloaded (may contain html)",
 134                 safe => 1,
 135                 rebuild => 0,
 136         },
 137         rcs => {
 138                 type => "string",
 139                 default => '',
 140                 description => "rcs backend to use",
 141                 safe => 0, # don't allow overriding
 142                 rebuild => 0,
 143         },
 144         default_plugins => {
 145                 type => "internal",
 146                 default => [qw{mdwn link inline meta htmlscrubber passwordauth
 147                                 openid signinedit lockedit conditional
 148                                 recentchanges parentlinks editpage}],
 149                 description => "plugins to enable by default",
 150                 safe => 0,
 151                 rebuild => 1,
 152         },
 153         add_plugins => {
 154                 type => "string",
 155                 default => [],
 156                 description => "plugins to add to the default configuration",
 157                 safe => 1,
 158                 rebuild => 1,
 159         },
 160         disable_plugins => {
 161                 type => "string",
 162                 default => [],
 163                 description => "plugins to disable",
 164                 safe => 1,
 165                 rebuild => 1,
 166         },
 167         templatedir => {
 168                 type => "string",
 169                 default => "$installdir/share/ikiwiki/templates",
 170                 description => "additional directory to search for template files",
 171                 advanced => 1,
 172                 safe => 0, # path
 173                 rebuild => 1,
 174         },
 175         underlaydir => {
 176                 type => "string",
 177                 default => "$installdir/share/ikiwiki/basewiki",
 178                 description => "base wiki source location",
 179                 advanced => 1,
 180                 safe => 0, # path
 181                 rebuild => 0,
 182         },
 183         underlaydirbase => {
 184                 type => "internal",
 185                 default => "$installdir/share/ikiwiki",
 186                 description => "parent directory containing additional underlays",
 187                 safe => 0,
 188                 rebuild => 0,
 189         },
 190         wrappers => {
 191                 type => "internal",
 192                 default => [],
 193                 description => "wrappers to generate",
 194                 safe => 0,
 195                 rebuild => 0,
 196         },
 197         underlaydirs => {
 198                 type => "internal",
 199                 default => [],
 200                 description => "additional underlays to use",
 201                 safe => 0,
 202                 rebuild => 0,
 203         },
 204         verbose => {
 205                 type => "boolean",
 206                 example => 1,
 207                 description => "display verbose messages?",
 208                 safe => 1,
 209                 rebuild => 0,
 210         },
 211         syslog => {
 212                 type => "boolean",
 213                 example => 1,
 214                 description => "log to syslog?",
 215                 safe => 1,
 216                 rebuild => 0,
 217         },
 218         usedirs => {
 219                 type => "boolean",
 220                 default => 1,
 221                 description => "create output files named page/index.html?",
 222                 safe => 0, # changing requires manual transition
 223                 rebuild => 1,
 224         },
 225         prefix_directives => {
 226                 type => "boolean",
 227                 default => 1,
 228                 description => "use '!'-prefixed preprocessor directives?",
 229                 safe => 0, # changing requires manual transition
 230                 rebuild => 1,
 231         },
 232         indexpages => {
 233                 type => "boolean",
 234                 default => 0,
 235                 description => "use page/index.mdwn source files",
 236                 safe => 1,
 237                 rebuild => 1,
 238         },
 239         discussion => {
 240                 type => "boolean",
 241                 default => 1,
 242                 description => "enable Discussion pages?",
 243                 safe => 1,
 244                 rebuild => 1,
 245         },
 246         discussionpage => {
 247                 type => "string",
 248                 default => gettext("Discussion"),
 249                 description => "name of Discussion pages",
 250                 safe => 1,
 251                 rebuild => 1,
 252         },
 253         html5 => {
 254                 type => "boolean",
 255                 default => 0,
 256                 description => "generate HTML5?",
 257                 advanced => 0,
 258                 safe => 1,
 259                 rebuild => 1,
 260         },
 261         sslcookie => {
 262                 type => "boolean",
 263                 default => 0,
 264                 description => "only send cookies over SSL connections?",
 265                 advanced => 1,
 266                 safe => 1,
 267                 rebuild => 0,
 268         },
 269         default_pageext => {
 270                 type => "string",
 271                 default => "mdwn",
 272                 description => "extension to use for new pages",
 273                 safe => 0, # not sanitized
 274                 rebuild => 0,
 275         },
 276         htmlext => {
 277                 type => "string",
 278                 default => "html",
 279                 description => "extension to use for html files",
 280                 safe => 0, # not sanitized
 281                 rebuild => 1,
 282         },
 283         timeformat => {
 284                 type => "string",
 285                 default => '%c',
 286                 description => "strftime format string to display date",
 287                 advanced => 1,
 288                 safe => 1,
 289                 rebuild => 1,
 290         },
 291         locale => {
 292                 type => "string",
 293                 default => undef,
 294                 example => "en_US.UTF-8",
 295                 description => "UTF-8 locale to use",
 296                 advanced => 1,
 297                 safe => 0,
 298                 rebuild => 1,
 299         },
 300         userdir => {
 301                 type => "string",
 302                 default => "",
 303                 example => "users",
 304                 description => "put user pages below specified page",
 305                 safe => 1,
 306                 rebuild => 1,
 307         },
 308         numbacklinks => {
 309                 type => "integer",
 310                 default => 10,
 311                 description => "how many backlinks to show before hiding excess (0 to show all)",
 312                 safe => 1,
 313                 rebuild => 1,
 314         },
 315         hardlink => {
 316                 type => "boolean",
 317                 default => 0,
 318                 description => "attempt to hardlink source files? (optimisation for large files)",
 319                 advanced => 1,
 320                 safe => 0, # paranoia
 321                 rebuild => 0,
 322         },
 323         umask => {
 324                 type => "string",
 325                 example => "public",
 326                 description => "force ikiwiki to use a particular umask (keywords public, group or private, or a number)",
 327                 advanced => 1,
 328                 safe => 0, # paranoia
 329                 rebuild => 0,
 330         },
 331         wrappergroup => {
 332                 type => "string",
 333                 example => "ikiwiki",
 334                 description => "group for wrappers to run in",
 335                 advanced => 1,
 336                 safe => 0, # paranoia
 337                 rebuild => 0,
 338         },
 339         libdir => {
 340                 type => "string",
 341                 default => "",
 342                 example => "$ENV{HOME}/.ikiwiki/",
 343                 description => "extra library and plugin directory",
 344                 advanced => 1,
 345                 safe => 0, # directory
 346                 rebuild => 0,
 347         },
 348         ENV => {
 349                 type => "string",
 350                 default => {},
 351                 description => "environment variables",
 352                 safe => 0, # paranoia
 353                 rebuild => 0,
 354         },
 355         timezone => {
 356                 type => "string",
 357                 default => "",
 358                 example => "US/Eastern",
 359                 description => "time zone name",
 360                 safe => 1,
 361                 rebuild => 1,
 362         },
 363         include => {
 364                 type => "string",
 365                 default => undef,
 366                 example => '^\.htaccess$',
 367                 description => "regexp of normally excluded files to include",
 368                 advanced => 1,
 369                 safe => 0, # regexp
 370                 rebuild => 1,
 371         },
 372         exclude => {
 373                 type => "string",
 374                 default => undef,
 375                 example => '^(*\.private|Makefile)$',
 376                 description => "regexp of files that should be skipped",
 377                 advanced => 1,
 378                 safe => 0, # regexp
 379                 rebuild => 1,
 380         },
 381         wiki_file_prune_regexps => {
 382                 type => "internal",
 383                 default => [qr/(^|\/)\.\.(\/|$)/, qr/^\//, qr/^\./, qr/\/\./,
 384                         qr/\.x?html?$/, qr/\.ikiwiki-new$/,
 385                         qr/(^|\/).svn\//, qr/.arch-ids\//, qr/{arch}\//,
 386                         qr/(^|\/)_MTN\//, qr/(^|\/)_darcs\//,
 387                         qr/(^|\/)CVS\//, qr/\.dpkg-tmp$/],
 388                 description => "regexps of source files to ignore",
 389                 safe => 0,
 390                 rebuild => 1,
 391         },
 392         wiki_file_chars => {
 393                 type => "string",
 394                 description => "specifies the characters that are allowed in source filenames",
 395                 default => "-[:alnum:]+/.:_",
 396                 safe => 0,
 397                 rebuild => 1,
 398         },
 399         wiki_file_regexp => {
 400                 type => "internal",
 401                 description => "regexp of legal source files",
 402                 safe => 0,
 403                 rebuild => 1,
 404         },
 405         web_commit_regexp => {
 406                 type => "internal",
 407                 default => qr/^web commit (by (.*?(?=: |$))|from ([0-9a-fA-F:.]+[0-9a-fA-F])):?(.*)/,
 408                 description => "regexp to parse web commits from logs",
 409                 safe => 0,
 410                 rebuild => 0,
 411         },
 412         cgi => {
 413                 type => "internal",
 414                 default => 0,
 415                 description => "run as a cgi",
 416                 safe => 0,
 417                 rebuild => 0,
 418         },
 419         cgi_disable_uploads => {
 420                 type => "internal",
 421                 default => 1,
 422                 description => "whether CGI should accept file uploads",
 423                 safe => 0,
 424                 rebuild => 0,
 425         },
 426         post_commit => {
 427                 type => "internal",
 428                 default => 0,
 429                 description => "run as a post-commit hook",
 430                 safe => 0,
 431                 rebuild => 0,
 432         },
 433         rebuild => {
 434                 type => "internal",
 435                 default => 0,
 436                 description => "running in rebuild mode",
 437                 safe => 0,
 438                 rebuild => 0,
 439         },
 440         setup => {
 441                 type => "internal",
 442                 default => undef,
 443                 description => "running in setup mode",
 444                 safe => 0,
 445                 rebuild => 0,
 446         },
 447         clean => {
 448                 type => "internal",
 449                 default => 0,
 450                 description => "running in clean mode",
 451                 safe => 0,
 452                 rebuild => 0,
 453         },
 454         refresh => {
 455                 type => "internal",
 456                 default => 0,
 457                 description => "running in refresh mode",
 458                 safe => 0,
 459                 rebuild => 0,
 460         },
 461         test_receive => {
 462                 type => "internal",
 463                 default => 0,
 464                 description => "running in receive test mode",
 465                 safe => 0,
 466                 rebuild => 0,
 467         },
 468         wrapper_background_command => {
 469                 type => "internal",
 470                 default => '',
 471                 description => "background shell command to run",
 472                 safe => 0,
 473                 rebuild => 0,
 474         },
 475         gettime => {
 476                 type => "internal",
 477                 description => "running in gettime mode",
 478                 safe => 0,
 479                 rebuild => 0,
 480         },
 481         w3mmode => {
 482                 type => "internal",
 483                 default => 0,
 484                 description => "running in w3mmode",
 485                 safe => 0,
 486                 rebuild => 0,
 487         },
 488         wikistatedir => {
 489                 type => "internal",
 490                 default => undef,
 491                 description => "path to the .ikiwiki directory holding ikiwiki state",
 492                 safe => 0,
 493                 rebuild => 0,
 494         },
 495         setupfile => {
 496                 type => "internal",
 497                 default => undef,
 498                 description => "path to setup file",
 499                 safe => 0,
 500                 rebuild => 0,
 501         },
 502         setuptype => {
 503                 type => "internal",
 504                 default => "Yaml",
 505                 description => "perl class to use to dump setup file",
 506                 safe => 0,
 507                 rebuild => 0,
 508         },
 509         allow_symlinks_before_srcdir => {
 510                 type => "boolean",
 511                 default => 0,
 512                 description => "allow symlinks in the path leading to the srcdir (potentially insecure)",
 513                 safe => 0,
 514                 rebuild => 0,
 515         },
 516 }
 517
 518 sub defaultconfig () {
 519         my %s=getsetup();
 520         my @ret;
 521         foreach my $key (keys %s) {
 522                 push @ret, $key, $s{$key}->{default};
 523         }
 524         return @ret;
 525 }
 526
 527 # URL to top of wiki as a path starting with /, valid from any wiki page or
 528 # the CGI; if that's not possible, an absolute URL. Either way, it ends with /
 529 my $local_url;
 530 # URL to CGI script, similar to $local_url
 531 my $local_cgiurl;
 532
 533 sub checkconfig () {
 534         # locale stuff; avoid LC_ALL since it overrides everything
 535         if (defined $ENV{LC_ALL}) {
 536                 $ENV{LANG} = $ENV{LC_ALL};
 537                 delete $ENV{LC_ALL};
 538         }
 539         if (defined $config{locale}) {
 540                 if (POSIX::setlocale(&POSIX::LC_ALL, $config{locale})) {
 541                         $ENV{LANG}=$config{locale};
 542                         define_gettext();
 543                 }
 544         }
 545
 546         if (! defined $config{wiki_file_regexp}) {
 547                 $config{wiki_file_regexp}=qr/(^[$config{wiki_file_chars}]+$)/;
 548         }
 549
 550         if (ref $config{ENV} eq 'HASH') {
 551                 foreach my $val (keys %{$config{ENV}}) {
 552                         $ENV{$val}=$config{ENV}{$val};
 553                 }
 554         }
 555         if (defined $config{timezone} && length $config{timezone}) {
 556                 $ENV{TZ}=$config{timezone};
 557         }
 558         else {
 559                 $config{timezone}=$ENV{TZ};
 560         }
 561
 562         if ($config{w3mmode}) {
 563                 eval q{use Cwd q{abs_path}};
 564                 error($@) if $@;
 565                 $config{srcdir}=possibly_foolish_untaint(abs_path($config{srcdir}));
 566                 $config{destdir}=possibly_foolish_untaint(abs_path($config{destdir}));
 567                 $config{cgiurl}="file:///\$LIB/ikiwiki-w3m.cgi/".$config{cgiurl}
 568                         unless $config{cgiurl} =~ m!file:///!;
 569                 $config{url}="file://".$config{destdir};
 570         }
 571
 572         if ($config{cgi} && ! length $config{url}) {
 573                 error(gettext("Must specify url to wiki with --url when using --cgi"));
 574         }
 575
 576         if (defined $config{url} && length $config{url}) {
 577                 eval q{use URI};
 578                 my $baseurl = URI->new($config{url});
 579
 580                 $local_url = $baseurl->path . "/";
 581                 $local_cgiurl = undef;
 582
 583                 if (length $config{cgiurl}) {
 584                         my $cgiurl = URI->new($config{cgiurl});
 585
 586                         $local_cgiurl = $cgiurl->path;
 587
 588                         if ($cgiurl->scheme ne $baseurl->scheme or
 589                                 $cgiurl->authority ne $baseurl->authority) {
 590                                 # too far apart, fall back to absolute URLs
 591                                 $local_url = "$config{url}/";
 592                                 $local_cgiurl = $config{cgiurl};
 593                         }
 594                 }
 595
 596                 $local_url =~ s{//$}{/};
 597         }
 598         else {
 599                 $local_cgiurl = $config{cgiurl};
 600         }
 601
 602         $config{wikistatedir}="$config{srcdir}/.ikiwiki"
 603                 unless exists $config{wikistatedir} && defined $config{wikistatedir};
 604
 605         if (defined $config{umask}) {
 606                 my $u = possibly_foolish_untaint($config{umask});
 607
 608                 if ($u =~ m/^\d+$/) {
 609                         umask($u);
 610                 }
 611                 elsif ($u eq 'private') {
 612                         umask(077);
 613                 }
 614                 elsif ($u eq 'group') {
 615                         umask(027);
 616                 }
 617                 elsif ($u eq 'public') {
 618                         umask(022);
 619                 }
 620                 else {
 621                         error(sprintf(gettext("unsupported umask setting %s"), $u));
 622                 }
 623         }
 624
 625         run_hooks(checkconfig => sub { shift->() });
 626
 627         return 1;
 628 }
 629
 630 sub listplugins () {
 631         my %ret;
 632
 633         foreach my $dir (@INC, $config{libdir}) {
 634                 next unless defined $dir && length $dir;
 635                 foreach my $file (glob("$dir/IkiWiki/Plugin/*.pm")) {
 636                         my ($plugin)=$file=~/.*\/(.*)\.pm$/;
 637                         $ret{$plugin}=1;
 638                 }
 639         }
 640         foreach my $dir ($config{libdir}, "$installdir/lib/ikiwiki") {
 641                 next unless defined $dir && length $dir;
 642                 foreach my $file (glob("$dir/plugins/*")) {
 643                         $ret{basename($file)}=1 if -x $file;
 644                 }
 645         }
 646
 647         return keys %ret;
 648 }
 649
 650 sub loadplugins () {
 651         if (defined $config{libdir} && length $config{libdir}) {
 652                 unshift @INC, possibly_foolish_untaint($config{libdir});
 653         }
 654
 655         foreach my $plugin (@{$config{default_plugins}}, @{$config{add_plugins}}) {
 656                 loadplugin($plugin);
 657         }
 658
 659         if ($config{rcs}) {
 660                 if (exists $hooks{rcs}) {
 661                         error(gettext("cannot use multiple rcs plugins"));
 662                 }
 663                 loadplugin($config{rcs});
 664         }
 665         if (! exists $hooks{rcs}) {
 666                 loadplugin("norcs");
 667         }
 668
 669         run_hooks(getopt => sub { shift->() });
 670         if (grep /^-/, @ARGV) {
 671                 print STDERR "Unknown option (or missing parameter): $_\n"
 672                         foreach grep /^-/, @ARGV;
 673                 usage();
 674         }
 675
 676         return 1;
 677 }
 678
 679 sub loadplugin ($;$) {
 680         my $plugin=shift;
 681         my $force=shift;
 682
 683         return if ! $force && grep { $_ eq $plugin} @{$config{disable_plugins}};
 684
 685         foreach my $dir (defined $config{libdir} ? possibly_foolish_untaint($config{libdir}) : undef,
 686                          "$installdir/lib/ikiwiki") {
 687                 if (defined $dir && -x "$dir/plugins/$plugin") {
 688                         eval { require IkiWiki::Plugin::external };
 689                         if ($@) {
 690                                 my $reason=$@;
 691                                 error(sprintf(gettext("failed to load external plugin needed for %s plugin: %s"), $plugin, $reason));
 692                         }
 693                         import IkiWiki::Plugin::external "$dir/plugins/$plugin";
 694                         $loaded_plugins{$plugin}=1;
 695                         return 1;
 696                 }
 697         }
 698
 699         my $mod="IkiWiki::Plugin::".possibly_foolish_untaint($plugin);
 700         eval qq{use $mod};
 701         if ($@) {
 702                 error("Failed to load plugin $mod: $@");
 703         }
 704         $loaded_plugins{$plugin}=1;
 705         return 1;
 706 }
 707
 708 sub error ($;$) {
 709         my $message=shift;
 710         my $cleaner=shift;
 711         log_message('err' => $message) if $config{syslog};
 712         if (defined $cleaner) {
 713                 $cleaner->();
 714         }
 715         die $message."\n";
 716 }
 717
 718 sub debug ($) {
 719         return unless $config{verbose};
 720         return log_message(debug => @_);
 721 }
 722
 723 my $log_open=0;
 724 sub log_message ($$) {
 725         my $type=shift;
 726
 727         if ($config{syslog}) {
 728                 require Sys::Syslog;
 729                 if (! $log_open) {
 730                         Sys::Syslog::setlogsock('unix');
 731                         Sys::Syslog::openlog('ikiwiki', '', 'user');
 732                         $log_open=1;
 733                 }
 734                 return eval {
 735                         Sys::Syslog::syslog($type, "[$config{wikiname}] %s", join(" ", @_));
 736                 };
 737         }
 738         elsif (! $config{cgi}) {
 739                 return print "@_\n";
 740         }
 741         else {
 742                 return print STDERR "@_\n";
 743         }
 744 }
 745
 746 sub possibly_foolish_untaint ($) {
 747         my $tainted=shift;
 748         my ($untainted)=$tainted=~/(.*)/s;
 749         return $untainted;
 750 }
 751
 752 sub basename ($) {
 753         my $file=shift;
 754
 755         $file=~s!.*/+!!;
 756         return $file;
 757 }
 758
 759 sub dirname ($) {
 760         my $file=shift;
 761
 762         $file=~s!/*[^/]+$!!;
 763         return $file;
 764 }
 765
 766 sub isinternal ($) {
 767         my $page=shift;
 768         return exists $pagesources{$page} &&
 769                 $pagesources{$page} =~ /\._([^.]+)$/;
 770 }
 771
 772 sub pagetype ($) {
 773         my $file=shift;
 774
 775         if ($file =~ /\.([^.]+)$/) {
 776                 return $1 if exists $hooks{htmlize}{$1};
 777         }
 778         my $base=basename($file);
 779         if (exists $hooks{htmlize}{$base} &&
 780             $hooks{htmlize}{$base}{noextension}) {
 781                 return $base;
 782         }
 783         return;
 784 }
 785
 786 my %pagename_cache;
 787
 788 sub pagename ($) {
 789         my $file=shift;
 790
 791         if (exists $pagename_cache{$file}) {
 792                 return $pagename_cache{$file};
 793         }
 794
 795         my $type=pagetype($file);
 796         my $page=$file;
 797         $page=~s/\Q.$type\E*$//
 798                 if defined $type && !$hooks{htmlize}{$type}{keepextension}
 799                         && !$hooks{htmlize}{$type}{noextension};
 800         if ($config{indexpages} && $page=~/(.*)\/index$/) {
 801                 $page=$1;
 802         }
 803
 804         $pagename_cache{$file} = $page;
 805         return $page;
 806 }
 807
 808 sub newpagefile ($$) {
 809         my $page=shift;
 810         my $type=shift;
 811
 812         if (! $config{indexpages} || $page eq 'index') {
 813                 return $page.".".$type;
 814         }
 815         else {
 816                 return $page."/index.".$type;
 817         }
 818 }
 819
 820 sub targetpage ($$;$) {
 821         my $page=shift;
 822         my $ext=shift;
 823         my $filename=shift;
 824
 825         if (defined $filename) {
 826                 return $page."/".$filename.".".$ext;
 827         }
 828         elsif (! $config{usedirs} || $page eq 'index') {
 829                 return $page.".".$ext;
 830         }
 831         else {
 832                 return $page."/index.".$ext;
 833         }
 834 }
 835
 836 sub htmlpage ($) {
 837         my $page=shift;
 838
 839         return targetpage($page, $config{htmlext});
 840 }
 841
 842 sub srcfile_stat {
 843         my $file=shift;
 844         my $nothrow=shift;
 845
 846         return "$config{srcdir}/$file", stat(_) if -e "$config{srcdir}/$file";
 847         foreach my $dir (@{$config{underlaydirs}}, $config{underlaydir}) {
 848                 return "$dir/$file", stat(_) if -e "$dir/$file";
 849         }
 850         error("internal error: $file cannot be found in $config{srcdir} or underlay") unless $nothrow;
 851         return;
 852 }
 853
 854 sub srcfile ($;$) {
 855         return (srcfile_stat(@_))[0];
 856 }
 857
 858 sub add_literal_underlay ($) {
 859         my $dir=shift;
 860
 861         if (! grep { $_ eq $dir } @{$config{underlaydirs}}) {
 862                 unshift @{$config{underlaydirs}}, $dir;
 863         }
 864 }
 865
 866 sub add_underlay ($) {
 867         my $dir = shift;
 868
 869         if ($dir !~ /^\//) {
 870                 $dir="$config{underlaydirbase}/$dir";
 871         }
 872
 873         add_literal_underlay($dir);
 874         # why does it return 1? we just don't know
 875         return 1;
 876 }
 877
 878 sub readfile ($;$$) {
 879         my $file=shift;
 880         my $binary=shift;
 881         my $wantfd=shift;
 882
 883         if (-l $file) {
 884                 error("cannot read a symlink ($file)");
 885         }
 886
 887         local $/=undef;
 888         open (my $in, "<", $file) || error("failed to read $file: $!");
 889         binmode($in) if ($binary);
 890         return \*$in if $wantfd;
 891         my $ret=<$in>;
 892         # check for invalid utf-8, and toss it back to avoid crashes
 893         if (! utf8::valid($ret)) {
 894                 $ret=encode_utf8($ret);
 895         }
 896         close $in || error("failed to read $file: $!");
 897         return $ret;
 898 }
 899
 900 sub prep_writefile ($$) {
 901         my $file=shift;
 902         my $destdir=shift;
 903
 904         my $test=$file;
 905         while (length $test) {
 906                 if (-l "$destdir/$test") {
 907                         error("cannot write to a symlink ($test)");
 908                 }
 909                 if (-f _ && $test ne $file) {
 910                         # Remove conflicting file.
 911                         foreach my $p (keys %renderedfiles, keys %oldrenderedfiles) {
 912                                 foreach my $f (@{$renderedfiles{$p}}, @{$oldrenderedfiles{$p}}) {
 913                                         if ($f eq $test) {
 914                                                 unlink("$destdir/$test");
 915                                                 last;
 916                                         }
 917                                 }
 918                         }
 919                 }
 920                 $test=dirname($test);
 921         }
 922
 923         my $dir=dirname("$destdir/$file");
 924         if (! -d $dir) {
 925                 my $d="";
 926                 foreach my $s (split(m!/+!, $dir)) {
 927                         $d.="$s/";
 928                         if (! -d $d) {
 929                                 mkdir($d) || error("failed to create directory $d: $!");
 930                         }
 931                 }
 932         }
 933
 934         return 1;
 935 }
 936
 937 sub writefile ($$$;$$) {
 938         my $file=shift; # can include subdirs
 939         my $destdir=shift; # directory to put file in
 940         my $content=shift;
 941         my $binary=shift;
 942         my $writer=shift;
 943
 944         prep_writefile($file, $destdir);
 945
 946         my $newfile="$destdir/$file.ikiwiki-new";
 947         if (-l $newfile) {
 948                 error("cannot write to a symlink ($newfile)");
 949         }
 950
 951         my $cleanup = sub { unlink($newfile) };
 952         open (my $out, '>', $newfile) || error("failed to write $newfile: $!", $cleanup);
 953         binmode($out) if ($binary);
 954         if ($writer) {
 955                 $writer->(\*$out, $cleanup);
 956         }
 957         else {
 958                 print $out $content or error("failed writing to $newfile: $!", $cleanup);
 959         }
 960         close $out || error("failed saving $newfile: $!", $cleanup);
 961         rename($newfile, "$destdir/$file") ||
 962                 error("failed renaming $newfile to $destdir/$file: $!", $cleanup);
 963
 964         return 1;
 965 }
 966
 967 my %cleared;
 968 sub will_render ($$;$) {
 969         my $page=shift;
 970         my $dest=shift;
 971         my $clear=shift;
 972
 973         # Important security check for independently created files.
 974         if (-e "$config{destdir}/$dest" && ! $config{rebuild} &&
 975             ! grep { $_ eq $dest } (@{$renderedfiles{$page}}, @{$oldrenderedfiles{$page}}, @{$wikistate{editpage}{previews}})) {
 976                 my $from_other_page=0;
 977                 # Expensive, but rarely runs.
 978                 foreach my $p (keys %renderedfiles, keys %oldrenderedfiles) {
 979                         if (grep {
 980                                 $_ eq $dest ||
 981                                 dirname($_) eq $dest
 982                             } @{$renderedfiles{$p}}, @{$oldrenderedfiles{$p}}) {
 983                                 $from_other_page=1;
 984                                 last;
 985                         }
 986                 }
 987
 988                 error("$config{destdir}/$dest independently created, not overwriting with version from $page")
 989                         unless $from_other_page;
 990         }
 991
 992         # If $dest exists as a directory, remove conflicting files in it
 993         # rendered from other pages.
 994         if (-d _) {
 995                 foreach my $p (keys %renderedfiles, keys %oldrenderedfiles) {
 996                         foreach my $f (@{$renderedfiles{$p}}, @{$oldrenderedfiles{$p}}) {
 997                                 if (dirname($f) eq $dest) {
 998                                         unlink("$config{destdir}/$f");
 999                                         rmdir(dirname("$config{destdir}/$f"));
1000                                 }
1001                         }
1002                 }
1003         }
1004
1005         if (! $clear || $cleared{$page}) {
1006                 $renderedfiles{$page}=[$dest, grep { $_ ne $dest } @{$renderedfiles{$page}}];
1007         }
1008         else {
1009                 foreach my $old (@{$renderedfiles{$page}}) {
1010                         delete $destsources{$old};
1011                 }
1012                 $renderedfiles{$page}=[$dest];
1013                 $cleared{$page}=1;
1014         }
1015         $destsources{$dest}=$page;
1016
1017         return 1;
1018 }
1019
1020 sub bestlink ($$) {
1021         my $page=shift;
1022         my $link=shift;
1023
1024         my $cwd=$page;
1025         if ($link=~s/^\/+//) {
1026                 # absolute links
1027                 $cwd="";
1028         }
1029         $link=~s/\/$//;
1030
1031         do {
1032                 my $l=$cwd;
1033                 $l.="/" if length $l;
1034                 $l.=$link;
1035
1036                 if (exists $pagesources{$l}) {
1037                         return $l;
1038                 }
1039                 elsif (exists $pagecase{lc $l}) {
1040                         return $pagecase{lc $l};
1041                 }
1042         } while $cwd=~s{/?[^/]+$}{};
1043
1044         if (length $config{userdir}) {
1045                 my $l = "$config{userdir}/".lc($link);
1046                 if (exists $pagesources{$l}) {
1047                         return $l;
1048                 }
1049                 elsif (exists $pagecase{lc $l}) {
1050                         return $pagecase{lc $l};
1051                 }
1052         }
1053
1054         #print STDERR "warning: page $page, broken link: $link\n";
1055         return "";
1056 }
1057
1058 sub isinlinableimage ($) {
1059         my $file=shift;
1060
1061         return $file =~ /\.(png|gif|jpg|jpeg|svg)$/i;
1062 }
1063
1064 sub pagetitle ($;$) {
1065         my $page=shift;
1066         my $unescaped=shift;
1067
1068         if ($unescaped) {
1069                 $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : chr($2)/eg;
1070         }
1071         else {
1072                 $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : "&#$2;"/eg;
1073         }
1074
1075         return $page;
1076 }
1077
1078 sub titlepage ($) {
1079         my $title=shift;
1080         # support use w/o %config set
1081         my $chars = defined $config{wiki_file_chars} ? $config{wiki_file_chars} : "-[:alnum:]+/.:_";
1082         $title=~s/([^$chars]|_)/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
1083         return $title;
1084 }
1085
1086 sub linkpage ($) {
1087         my $link=shift;
1088         my $chars = defined $config{wiki_file_chars} ? $config{wiki_file_chars} : "-[:alnum:]+/.:_";
1089         $link=~s/([^$chars])/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
1090         return $link;
1091 }
1092
1093 sub cgiurl (@) {
1094         my %params=@_;
1095
1096         my $cgiurl=$local_cgiurl;
1097
1098         if (exists $params{cgiurl}) {
1099                 $cgiurl=$params{cgiurl};
1100                 delete $params{cgiurl};
1101         }
1102
1103         unless (%params) {
1104                 return $cgiurl;
1105         }
1106
1107         return $cgiurl."?".
1108                 join("&amp;", map $_."=".uri_escape_utf8($params{$_}), keys %params);
1109 }
1110
1111 sub cgiurl_abs (@) {
1112         eval q{use URI};
1113         URI->new_abs(cgiurl(@_), $config{cgiurl});
1114 }
1115
1116 sub baseurl (;$) {
1117         my $page=shift;
1118
1119         return $local_url if ! defined $page;
1120
1121         $page=htmlpage($page);
1122         $page=~s/[^\/]+$//;
1123         $page=~s/[^\/]+\//..\//g;
1124         return $page;
1125 }
1126
1127 sub urlabs ($$) {
1128         my $url=shift;
1129         my $urlbase=shift;
1130
1131         return $url unless defined $urlbase && length $urlbase;
1132
1133         eval q{use URI};
1134         URI->new_abs($url, $urlbase)->as_string;
1135 }
1136
1137 sub abs2rel ($$) {
1138         # Work around very innefficient behavior in File::Spec if abs2rel
1139         # is passed two relative paths. It's much faster if paths are
1140         # absolute! (Debian bug #376658; fixed in debian unstable now)
1141         my $path="/".shift;
1142         my $base="/".shift;
1143
1144         require File::Spec;
1145         my $ret=File::Spec->abs2rel($path, $base);
1146         $ret=~s/^// if defined $ret;
1147         return $ret;
1148 }
1149
1150 sub displaytime ($;$$) {
1151         # Plugins can override this function to mark up the time to
1152         # display.
1153         my $time=formattime($_[0], $_[1]);
1154         if ($config{html5}) {
1155                 return '<time datetime="'.date_3339($_[0]).'"'.
1156                         ($_[2] ? ' pubdate="pubdate"' : '').
1157                         '>'.$time.'</time>';
1158         }
1159         else {
1160                 return '<span class="date">'.$time.'</span>';
1161         }
1162 }
1163
1164 sub formattime ($;$) {
1165         # Plugins can override this function to format the time.
1166         my $time=shift;
1167         my $format=shift;
1168         if (! defined $format) {
1169                 $format=$config{timeformat};
1170         }
1171
1172         return strftime_utf8($format, localtime($time));
1173 }
1174
1175 my $strftime_encoding;
1176 sub strftime_utf8 {
1177         # strftime doesn't know about encodings, so make sure
1178         # its output is properly treated as utf8.
1179         # Note that this does not handle utf-8 in the format string.
1180         ($strftime_encoding) = POSIX::setlocale(&POSIX::LC_TIME) =~ m#\.([^@]+)#
1181                 unless defined $strftime_encoding;
1182         $strftime_encoding
1183                 ? Encode::decode($strftime_encoding, POSIX::strftime(@_))
1184                 : POSIX::strftime(@_);
1185 }
1186
1187 sub date_3339 ($) {
1188         my $time=shift;
1189
1190         my $lc_time=POSIX::setlocale(&POSIX::LC_TIME);
1191         POSIX::setlocale(&POSIX::LC_TIME, "C");
1192         my $ret=POSIX::strftime("%Y-%m-%dT%H:%M:%SZ", gmtime($time));
1193         POSIX::setlocale(&POSIX::LC_TIME, $lc_time);
1194         return $ret;
1195 }
1196
1197 sub beautify_urlpath ($) {
1198         my $url=shift;
1199
1200         # Ensure url is not an empty link, and if necessary,
1201         # add ./ to avoid colon confusion.
1202         if ($url !~ /^\// && $url !~ /^\.\.?\//) {
1203                 $url="./$url";
1204         }
1205
1206         if ($config{usedirs}) {
1207                 $url =~ s!/index.$config{htmlext}$!/!;
1208         }
1209
1210         return $url;
1211 }
1212
1213 sub urlto ($;$$) {
1214         my $to=shift;
1215         my $from=shift;
1216         my $absolute=shift;
1217
1218         if (! length $to) {
1219                 $to = 'index';
1220         }
1221
1222         if (! $destsources{$to}) {
1223                 $to=htmlpage($to);
1224         }
1225
1226         if ($absolute) {
1227                 return $config{url}.beautify_urlpath("/".$to);
1228         }
1229
1230         if (! defined $from) {
1231                 my $u = $local_url || '';
1232                 $u =~ s{/$}{};
1233                 return $u.beautify_urlpath("/".$to);
1234         }
1235
1236         my $link = abs2rel($to, dirname(htmlpage($from)));
1237
1238         return beautify_urlpath($link);
1239 }
1240
1241 sub isselflink ($$) {
1242         # Plugins can override this function to support special types
1243         # of selflinks.
1244         my $page=shift;
1245         my $link=shift;
1246
1247         return $page eq $link;
1248 }
1249
1250 sub htmllink ($$$;@) {
1251         my $lpage=shift; # the page doing the linking
1252         my $page=shift; # the page that will contain the link (different for inline)
1253         my $link=shift;
1254         my %opts=@_;
1255
1256         $link=~s/\/$//;
1257
1258         my $bestlink;
1259         if (! $opts{forcesubpage}) {
1260                 $bestlink=bestlink($lpage, $link);
1261         }
1262         else {
1263                 $bestlink="$lpage/".lc($link);
1264         }
1265
1266         my $linktext;
1267         if (defined $opts{linktext}) {
1268                 $linktext=$opts{linktext};
1269         }
1270         else {
1271                 $linktext=pagetitle(basename($link));
1272         }
1273
1274         return "<span class=\"selflink\">$linktext</span>"
1275                 if length $bestlink && isselflink($page, $bestlink) &&
1276                    ! defined $opts{anchor};
1277
1278         if (! $destsources{$bestlink}) {
1279                 $bestlink=htmlpage($bestlink);
1280
1281                 if (! $destsources{$bestlink}) {
1282                         my $cgilink = "";
1283                         if (length $config{cgiurl}) {
1284                                 $cgilink = "<a href=\"".
1285                                         cgiurl(
1286                                                 do => "create",
1287                                                 page => $link,
1288                                                 from => $lpage
1289                                         )."\" rel=\"nofollow\">?</a>";
1290                         }
1291                         return "<span class=\"createlink\">$cgilink$linktext</span>"
1292                 }
1293         }
1294
1295         $bestlink=abs2rel($bestlink, dirname(htmlpage($page)));
1296         $bestlink=beautify_urlpath($bestlink);
1297
1298         if (! $opts{noimageinline} && isinlinableimage($bestlink)) {
1299                 return "<img src=\"$bestlink\" alt=\"$linktext\" />";
1300         }
1301
1302         if (defined $opts{anchor}) {
1303                 $bestlink.="#".$opts{anchor};
1304         }
1305
1306         my @attrs;
1307         foreach my $attr (qw{rel class title}) {
1308                 if (defined $opts{$attr}) {
1309                         push @attrs, " $attr=\"$opts{$attr}\"";
1310                 }
1311         }
1312
1313         return "<a href=\"$bestlink\"@attrs>$linktext</a>";
1314 }
1315
1316 sub userpage ($) {
1317         my $user=shift;
1318         return length $config{userdir} ? "$config{userdir}/$user" : $user;
1319 }
1320
1321 sub openiduser ($) {
1322         my $user=shift;
1323
1324         if (defined $user && $user =~ m!^https?://! &&
1325             eval q{use Net::OpenID::VerifiedIdentity; 1} && !$@) {
1326                 my $display;
1327
1328                 if (Net::OpenID::VerifiedIdentity->can("DisplayOfURL")) {
1329                         $display = Net::OpenID::VerifiedIdentity::DisplayOfURL($user);
1330                 }
1331                 else {
1332                         # backcompat with old version
1333                         my $oid=Net::OpenID::VerifiedIdentity->new(identity => $user);
1334                         $display=$oid->display;
1335                 }
1336
1337                 # Convert "user.somehost.com" to "user [somehost.com]"
1338                 # (also "user.somehost.co.uk")
1339                 if ($display !~ /\[/) {
1340                         $display=~s/^([-a-zA-Z0-9]+?)\.([-.a-zA-Z0-9]+\.[a-z]+)$/$1 [$2]/;
1341                 }
1342                 # Convert "http://somehost.com/user" to "user [somehost.com]".
1343                 # (also "https://somehost.com/user/")
1344                 if ($display !~ /\[/) {
1345                         $display=~s/^https?:\/\/(.+)\/([^\/#?]+)\/?(?:[#?].*)?$/$2 [$1]/;
1346                 }
1347                 $display=~s!^https?://!!; # make sure this is removed
1348                 eval q{use CGI 'escapeHTML'};
1349                 error($@) if $@;
1350                 return escapeHTML($display);
1351         }
1352         return;
1353 }
1354
1355 sub htmlize ($$$$) {
1356         my $page=shift;
1357         my $destpage=shift;
1358         my $type=shift;
1359         my $content=shift;
1360
1361         my $oneline = $content !~ /\n/;
1362
1363         if (exists $hooks{htmlize}{$type}) {
1364                 $content=$hooks{htmlize}{$type}{call}->(
1365                         page => $page,
1366                         content => $content,
1367                 );
1368         }
1369         else {
1370                 error("htmlization of $type not supported");
1371         }
1372
1373         run_hooks(sanitize => sub {
1374                 $content=shift->(
1375                         page => $page,
1376                         destpage => $destpage,
1377                         content => $content,
1378                 );
1379         });
1380
1381         if ($oneline) {
1382                 # hack to get rid of enclosing junk added by markdown
1383                 # and other htmlizers/sanitizers
1384                 $content=~s/^<p>//i;
1385                 $content=~s/<\/p>\n*$//i;
1386         }
1387
1388         return $content;
1389 }
1390
1391 sub linkify ($$$) {
1392         my $page=shift;
1393         my $destpage=shift;
1394         my $content=shift;
1395
1396         run_hooks(linkify => sub {
1397                 $content=shift->(
1398                         page => $page,
1399                         destpage => $destpage,
1400                         content => $content,
1401                 );
1402         });
1403
1404         return $content;
1405 }
1406
1407 our %preprocessing;
1408 our $preprocess_preview=0;
1409 sub preprocess ($$$;$$) {
1410         my $page=shift; # the page the data comes from
1411         my $destpage=shift; # the page the data will appear in (different for inline)
1412         my $content=shift;
1413         my $scan=shift;
1414         my $preview=shift;
1415
1416         # Using local because it needs to be set within any nested calls
1417         # of this function.
1418         local $preprocess_preview=$preview if defined $preview;
1419
1420         my $handle=sub {
1421                 my $escape=shift;
1422                 my $prefix=shift;
1423                 my $command=shift;
1424                 my $params=shift;
1425                 $params="" if ! defined $params;
1426
1427                 if (length $escape) {
1428                         return "[[$prefix$command $params]]";
1429                 }
1430                 elsif (exists $hooks{preprocess}{$command}) {
1431                         return "" if $scan && ! $hooks{preprocess}{$command}{scan};
1432                         # Note: preserve order of params, some plugins may
1433                         # consider it significant.
1434                         my @params;
1435                         while ($params =~ m{
1436                                 (?:([-.\w]+)=)?         # 1: named parameter key?
1437                                 (?:
1438                                         """(.*?)"""     # 2: triple-quoted value
1439                                 |
1440                                         "([^"]*?)"      # 3: single-quoted value
1441                                 |
1442                                         '''(.*?)'''     # 4: triple-single-quote
1443                                 |
1444                                         <<([a-zA-Z]+)\n # 5: heredoc start
1445                                         (.*?)\n\5       # 6: heredoc value
1446                                 |
1447                                         (\S+)           # 7: unquoted value
1448                                 )
1449                                 (?:\s+|$)               # delimiter to next param
1450                         }msgx) {
1451                                 my $key=$1;
1452                                 my $val;
1453                                 if (defined $2) {
1454                                         $val=$2;
1455                                         $val=~s/\r\n/\n/mg;
1456                                         $val=~s/^\n+//g;
1457                                         $val=~s/\n+$//g;
1458                                 }
1459                                 elsif (defined $3) {
1460                                         $val=$3;
1461                                 }
1462                                 elsif (defined $4) {
1463                                         $val=$4;
1464                                 }
1465                                 elsif (defined $7) {
1466                                         $val=$7;
1467                                 }
1468                                 elsif (defined $6) {
1469                                         $val=$6;
1470                                 }
1471
1472                                 if (defined $key) {
1473                                         push @params, $key, $val;
1474                                 }
1475                                 else {
1476                                         push @params, $val, '';
1477                                 }
1478                         }
1479                         if ($preprocessing{$page}++ > 3) {
1480                                 # Avoid loops of preprocessed pages preprocessing
1481                                 # other pages that preprocess them, etc.
1482                                 return "[[!$command <span class=\"error\">".
1483                                         sprintf(gettext("preprocessing loop detected on %s at depth %i"),
1484                                                 $page, $preprocessing{$page}).
1485                                         "</span>]]";
1486                         }
1487                         my $ret;
1488                         if (! $scan) {
1489                                 $ret=eval {
1490                                         $hooks{preprocess}{$command}{call}->(
1491                                                 @params,
1492                                                 page => $page,
1493                                                 destpage => $destpage,
1494                                                 preview => $preprocess_preview,
1495                                         );
1496                                 };
1497                                 if ($@) {
1498                                         my $error=$@;
1499                                         chomp $error;
1500                                         $ret="[[!$command <span class=\"error\">".
1501                                                 gettext("Error").": $error"."</span>]]";
1502                                 }
1503                         }
1504                         else {
1505                                 # use void context during scan pass
1506                                 eval {
1507                                         $hooks{preprocess}{$command}{call}->(
1508                                                 @params,
1509                                                 page => $page,
1510                                                 destpage => $destpage,
1511                                                 preview => $preprocess_preview,
1512                                         );
1513                                 };
1514                                 $ret="";
1515                         }
1516                         $preprocessing{$page}--;
1517                         return $ret;
1518                 }
1519                 else {
1520                         return "[[$prefix$command $params]]";
1521                 }
1522         };
1523
1524         my $regex;
1525         if ($config{prefix_directives}) {
1526                 $regex = qr{
1527                         (\\?)           # 1: escape?
1528                         \[\[(!)         # directive open; 2: prefix
1529                         ([-\w]+)        # 3: command
1530                         (               # 4: the parameters..
1531                                 \s+     # Must have space if parameters present
1532                                 (?:
1533                                         (?:[-.\w]+=)?           # named parameter key?
1534                                         (?:
1535                                                 """.*?"""       # triple-quoted value
1536                                                 |
1537                                                 "[^"]*?"        # single-quoted value
1538                                                 |
1539                                                 '''.*?'''       # triple-single-quote
1540                                                 |
1541                                                 <<([a-zA-Z]+)\n # 5: heredoc start
1542                                                 (?:.*?)\n\5     # heredoc value
1543                                                 |
1544                                                 [^"\s\]]+       # unquoted value
1545                                         )
1546                                         \s*                     # whitespace or end
1547                                                                 # of directive
1548                                 )
1549                         *)?             # 0 or more parameters
1550                         \]\]            # directive closed
1551                 }sx;
1552         }
1553         else {
1554                 $regex = qr{
1555                         (\\?)           # 1: escape?
1556                         \[\[(!?)        # directive open; 2: optional prefix
1557                         ([-\w]+)        # 3: command
1558                         \s+
1559                         (               # 4: the parameters..
1560                                 (?:
1561                                         (?:[-.\w]+=)?           # named parameter key?
1562                                         (?:
1563                                                 """.*?"""       # triple-quoted value
1564                                                 |
1565                                                 "[^"]*?"        # single-quoted value
1566                                                 |
1567                                                 '''.*?'''       # triple-single-quote
1568                                                 |
1569                                                 <<([a-zA-Z]+)\n # 5: heredoc start
1570                                                 (?:.*?)\n\5     # heredoc value
1571                                                 |
1572                                                 [^"\s\]]+       # unquoted value
1573                                         )
1574                                         \s*                     # whitespace or end
1575                                                                 # of directive
1576                                 )
1577                         *)              # 0 or more parameters
1578                         \]\]            # directive closed
1579                 }sx;
1580         }
1581
1582         $content =~ s{$regex}{$handle->($1, $2, $3, $4)}eg;
1583         return $content;
1584 }
1585
1586 sub filter ($$$) {
1587         my $page=shift;
1588         my $destpage=shift;
1589         my $content=shift;
1590
1591         run_hooks(filter => sub {
1592                 $content=shift->(page => $page, destpage => $destpage,
1593                         content => $content);
1594         });
1595
1596         return $content;
1597 }
1598
1599 sub check_canedit ($$$;$) {
1600         my $page=shift;
1601         my $q=shift;
1602         my $session=shift;
1603         my $nonfatal=shift;
1604
1605         my $canedit;
1606         run_hooks(canedit => sub {
1607                 return if defined $canedit;
1608                 my $ret=shift->($page, $q, $session);
1609                 if (defined $ret) {
1610                         if ($ret eq "") {
1611                                 $canedit=1;
1612                         }
1613                         elsif (ref $ret eq 'CODE') {
1614                                 $ret->() unless $nonfatal;
1615                                 $canedit=0;
1616                         }
1617                         elsif (defined $ret) {
1618                                 error($ret) unless $nonfatal;
1619                                 $canedit=0;
1620                         }
1621                 }
1622         });
1623         return defined $canedit ? $canedit : 1;
1624 }
1625
1626 sub check_content (@) {
1627         my %params=@_;
1628
1629         return 1 if ! exists $hooks{checkcontent}; # optimisation
1630
1631         if (exists $pagesources{$params{page}}) {
1632                 my @diff;
1633                 my %old=map { $_ => 1 }
1634                         split("\n", readfile(srcfile($pagesources{$params{page}})));
1635                 foreach my $line (split("\n", $params{content})) {
1636                         push @diff, $line if ! exists $old{$line};
1637                 }
1638                 $params{diff}=join("\n", @diff);
1639         }
1640
1641         my $ok;
1642         run_hooks(checkcontent => sub {
1643                 return if defined $ok;
1644                 my $ret=shift->(%params);
1645                 if (defined $ret) {
1646                         if ($ret eq "") {
1647                                 $ok=1;
1648                         }
1649                         elsif (ref $ret eq 'CODE') {
1650                                 $ret->() unless $params{nonfatal};
1651                                 $ok=0;
1652                         }
1653                         elsif (defined $ret) {
1654                                 error($ret) unless $params{nonfatal};
1655                                 $ok=0;
1656                         }
1657                 }
1658
1659         });
1660         return defined $ok ? $ok : 1;
1661 }
1662
1663 sub check_canchange (@) {
1664         my %params = @_;
1665         my $cgi = $params{cgi};
1666         my $session = $params{session};
1667         my @changes = @{$params{changes}};
1668
1669         my %newfiles;
1670         foreach my $change (@changes) {
1671                 # This untaint is safe because we check file_pruned and
1672                 # wiki_file_regexp.
1673                 my ($file)=$change->{file}=~/$config{wiki_file_regexp}/;
1674                 $file=possibly_foolish_untaint($file);
1675                 if (! defined $file || ! length $file ||
1676                     file_pruned($file)) {
1677                         error(gettext("bad file name %s"), $file);
1678                 }
1679
1680                 my $type=pagetype($file);
1681                 my $page=pagename($file) if defined $type;
1682
1683                 if ($change->{action} eq 'add') {
1684                         $newfiles{$file}=1;
1685                 }
1686
1687                 if ($change->{action} eq 'change' ||
1688                     $change->{action} eq 'add') {
1689                         if (defined $page) {
1690                                 check_canedit($page, $cgi, $session);
1691                                 next;
1692                         }
1693                         else {
1694                                 if (IkiWiki::Plugin::attachment->can("check_canattach")) {
1695                                         IkiWiki::Plugin::attachment::check_canattach($session, $file, $change->{path});
1696                                         check_canedit($file, $cgi, $session);
1697                                         next;
1698                                 }
1699                         }
1700                 }
1701                 elsif ($change->{action} eq 'remove') {
1702                         # check_canremove tests to see if the file is present
1703                         # on disk. This will fail when a single commit adds a
1704                         # file and then removes it again. Avoid the problem
1705                         # by not testing the removal in such pairs of changes.
1706                         # (The add is still tested, just to make sure that
1707                         # no data is added to the repo that a web edit
1708                         # could not add.)
1709                         next if $newfiles{$file};
1710
1711                         if (IkiWiki::Plugin::remove->can("check_canremove")) {
1712                                 IkiWiki::Plugin::remove::check_canremove(defined $page ? $page : $file, $cgi, $session);
1713                                 check_canedit(defined $page ? $page : $file, $cgi, $session);
1714                                 next;
1715                         }
1716                 }
1717                 else {
1718                         error "unknown action ".$change->{action};
1719                 }
1720
1721                 error sprintf(gettext("you are not allowed to change %s"), $file);
1722         }
1723 }
1724
1725
1726 my $wikilock;
1727
1728 sub lockwiki () {
1729         # Take an exclusive lock on the wiki to prevent multiple concurrent
1730         # run issues. The lock will be dropped on program exit.
1731         if (! -d $config{wikistatedir}) {
1732                 mkdir($config{wikistatedir});
1733         }
1734         open($wikilock, '>', "$config{wikistatedir}/lockfile") ||
1735                 error ("cannot write to $config{wikistatedir}/lockfile: $!");
1736         if (! flock($wikilock, 2)) { # LOCK_EX
1737                 error("failed to get lock");
1738         }
1739         return 1;
1740 }
1741
1742 sub unlockwiki () {
1743         POSIX::close($ENV{IKIWIKI_CGILOCK_FD}) if exists $ENV{IKIWIKI_CGILOCK_FD};
1744         return close($wikilock) if $wikilock;
1745         return;
1746 }
1747
1748 my $commitlock;
1749
1750 sub commit_hook_enabled () {
1751         open($commitlock, '+>', "$config{wikistatedir}/commitlock") ||
1752                 error("cannot write to $config{wikistatedir}/commitlock: $!");
1753         if (! flock($commitlock, 1 | 4)) { # LOCK_SH | LOCK_NB to test
1754                 close($commitlock) || error("failed closing commitlock: $!");
1755                 return 0;
1756         }
1757         close($commitlock) || error("failed closing commitlock: $!");
1758         return 1;
1759 }
1760
1761 sub disable_commit_hook () {
1762         open($commitlock, '>', "$config{wikistatedir}/commitlock") ||
1763                 error("cannot write to $config{wikistatedir}/commitlock: $!");
1764         if (! flock($commitlock, 2)) { # LOCK_EX
1765                 error("failed to get commit lock");
1766         }
1767         return 1;
1768 }
1769
1770 sub enable_commit_hook () {
1771         return close($commitlock) if $commitlock;
1772         return;
1773 }
1774
1775 sub loadindex () {
1776         %oldrenderedfiles=%pagectime=();
1777         if (! $config{rebuild}) {
1778                 %pagesources=%pagemtime=%oldlinks=%links=%depends=
1779                 %destsources=%renderedfiles=%pagecase=%pagestate=
1780                 %depends_simple=%typedlinks=%oldtypedlinks=();
1781         }
1782         my $in;
1783         if (! open ($in, "<", "$config{wikistatedir}/indexdb")) {
1784                 if (-e "$config{wikistatedir}/index") {
1785                         system("ikiwiki-transition", "indexdb", $config{srcdir});
1786                         open ($in, "<", "$config{wikistatedir}/indexdb") || return;
1787                 }
1788                 else {
1789                         $config{gettime}=1; # first build
1790                         return;
1791                 }
1792         }
1793
1794         my $index=Storable::fd_retrieve($in);
1795         if (! defined $index) {
1796                 return 0;
1797         }
1798
1799         my $pages;
1800         if (exists $index->{version} && ! ref $index->{version}) {
1801                 $pages=$index->{page};
1802                 %wikistate=%{$index->{state}};
1803                 # Handle plugins that got disabled by loading a new setup.
1804                 if (exists $config{setupfile}) {
1805                         require IkiWiki::Setup;
1806                         IkiWiki::Setup::disabled_plugins(
1807                                 grep { ! $loaded_plugins{$_} } keys %wikistate);
1808                 }
1809         }
1810         else {
1811                 $pages=$index;
1812                 %wikistate=();
1813         }
1814
1815         foreach my $src (keys %$pages) {
1816                 my $d=$pages->{$src};
1817                 my $page=pagename($src);
1818                 $pagectime{$page}=$d->{ctime};
1819                 $pagesources{$page}=$src;
1820                 if (! $config{rebuild}) {
1821                         $pagemtime{$page}=$d->{mtime};
1822                         $renderedfiles{$page}=$d->{dest};
1823                         if (exists $d->{links} && ref $d->{links}) {
1824                                 $links{$page}=$d->{links};
1825                                 $oldlinks{$page}=[@{$d->{links}}];
1826                         }
1827                         if (ref $d->{depends_simple} eq 'ARRAY') {
1828                                 # old format
1829                                 $depends_simple{$page}={
1830                                         map { $_ => 1 } @{$d->{depends_simple}}
1831                                 };
1832                         }
1833                         elsif (exists $d->{depends_simple}) {
1834                                 $depends_simple{$page}=$d->{depends_simple};
1835                         }
1836                         if (exists $d->{dependslist}) {
1837                                 # old format
1838                                 $depends{$page}={
1839                                         map { $_ => $DEPEND_CONTENT }
1840                                                 @{$d->{dependslist}}
1841                                 };
1842                         }
1843                         elsif (exists $d->{depends} && ! ref $d->{depends}) {
1844                                 # old format
1845                                 $depends{$page}={$d->{depends} => $DEPEND_CONTENT };
1846                         }
1847                         elsif (exists $d->{depends}) {
1848                                 $depends{$page}=$d->{depends};
1849                         }
1850                         if (exists $d->{state}) {
1851                                 $pagestate{$page}=$d->{state};
1852                         }
1853                         if (exists $d->{typedlinks}) {
1854                                 $typedlinks{$page}=$d->{typedlinks};
1855
1856                                 while (my ($type, $links) = each %{$typedlinks{$page}}) {
1857                                         next unless %$links;
1858                                         $oldtypedlinks{$page}{$type} = {%$links};
1859                                 }
1860                         }
1861                 }
1862                 $oldrenderedfiles{$page}=[@{$d->{dest}}];
1863         }
1864         foreach my $page (keys %pagesources) {
1865                 $pagecase{lc $page}=$page;
1866         }
1867         foreach my $page (keys %renderedfiles) {
1868                 $destsources{$_}=$page foreach @{$renderedfiles{$page}};
1869         }
1870         return close($in);
1871 }
1872
1873 sub saveindex () {
1874         run_hooks(savestate => sub { shift->() });
1875
1876         my @plugins=keys %loaded_plugins;
1877
1878         if (! -d $config{wikistatedir}) {
1879                 mkdir($config{wikistatedir});
1880         }
1881         my $newfile="$config{wikistatedir}/indexdb.new";
1882         my $cleanup = sub { unlink($newfile) };
1883         open (my $out, '>', $newfile) || error("cannot write to $newfile: $!", $cleanup);
1884
1885         my %index;
1886         foreach my $page (keys %pagemtime) {
1887                 next unless $pagemtime{$page};
1888                 my $src=$pagesources{$page};
1889
1890                 $index{page}{$src}={
1891                         ctime => $pagectime{$page},
1892                         mtime => $pagemtime{$page},
1893                         dest => $renderedfiles{$page},
1894                         links => $links{$page},
1895                 };
1896
1897                 if (exists $depends{$page}) {
1898                         $index{page}{$src}{depends} = $depends{$page};
1899                 }
1900
1901                 if (exists $depends_simple{$page}) {
1902                         $index{page}{$src}{depends_simple} = $depends_simple{$page};
1903                 }
1904
1905                 if (exists $typedlinks{$page} && %{$typedlinks{$page}}) {
1906                         $index{page}{$src}{typedlinks} = $typedlinks{$page};
1907                 }
1908
1909                 if (exists $pagestate{$page}) {
1910                         foreach my $id (@plugins) {
1911                                 foreach my $key (keys %{$pagestate{$page}{$id}}) {
1912                                         $index{page}{$src}{state}{$id}{$key}=$pagestate{$page}{$id}{$key};
1913                                 }
1914                         }
1915                 }
1916         }
1917
1918         $index{state}={};
1919         foreach my $id (@plugins) {
1920                 $index{state}{$id}={}; # used to detect disabled plugins
1921                 foreach my $key (keys %{$wikistate{$id}}) {
1922                         $index{state}{$id}{$key}=$wikistate{$id}{$key};
1923                 }
1924         }
1925
1926         $index{version}="3";
1927         my $ret=Storable::nstore_fd(\%index, $out);
1928         return if ! defined $ret || ! $ret;
1929         close $out || error("failed saving to $newfile: $!", $cleanup);
1930         rename($newfile, "$config{wikistatedir}/indexdb") ||
1931                 error("failed renaming $newfile to $config{wikistatedir}/indexdb", $cleanup);
1932
1933         return 1;
1934 }
1935
1936 sub template_file ($) {
1937         my $name=shift;
1938
1939         my $tpage=($name =~ s/^\///) ? $name : "templates/$name";
1940         my $template;
1941         if ($name !~ /\.tmpl$/ && exists $pagesources{$tpage}) {
1942                 $template=srcfile($pagesources{$tpage}, 1);
1943                 $name.=".tmpl";
1944         }
1945         else {
1946                 $template=srcfile($tpage, 1);
1947         }
1948
1949         if (defined $template) {
1950                 return $template, $tpage, 1 if wantarray;
1951                 return $template;
1952         }
1953         else {
1954                 $name=~s:/::; # avoid path traversal
1955                 foreach my $dir ($config{templatedir},
1956                                  "$installdir/share/ikiwiki/templates") {
1957                         if (-e "$dir/$name") {
1958                                 $template="$dir/$name";
1959                                 last;
1960                         }
1961                 }
1962                 if (defined $template) {
1963                         return $template, $tpage if wantarray;
1964                         return $template;
1965                 }
1966         }
1967
1968         return;
1969 }
1970
1971 sub template_depends ($$;@) {
1972         my $name=shift;
1973         my $page=shift;
1974
1975         my ($filename, $tpage, $untrusted)=template_file($name);
1976         if (! defined $filename) {
1977                 error(sprintf(gettext("template %s not found"), $name))
1978         }
1979
1980         if (defined $page && defined $tpage) {
1981                 add_depends($page, $tpage);
1982         }
1983
1984         my @opts=(
1985                 filter => sub {
1986                         my $text_ref = shift;
1987                         ${$text_ref} = decode_utf8(${$text_ref});
1988                 },
1989                 loop_context_vars => 1,
1990                 die_on_bad_params => 0,
1991                 parent_global_vars => 1,
1992                 filename => $filename,
1993                 @_,
1994                 ($untrusted ? (no_includes => 1) : ()),
1995         );
1996         return @opts if wantarray;
1997
1998         require HTML::Template;
1999         return HTML::Template->new(@opts);
2000 }
2001
2002 sub template ($;@) {
2003         template_depends(shift, undef, @_);
2004 }
2005
2006 sub templateactions ($$) {
2007         my $template=shift;
2008         my $page=shift;
2009
2010         my $have_actions=0;
2011         my @actions;
2012         run_hooks(pageactions => sub {
2013                 push @actions, map { { action => $_ } }
2014                         grep { defined } shift->(page => $page);
2015         });
2016         $template->param(actions => \@actions);
2017
2018         if ($config{cgiurl} && exists $hooks{auth}) {
2019                 $template->param(prefsurl => cgiurl(do => "prefs"));
2020                 $have_actions=1;
2021         }
2022
2023         if ($have_actions || @actions) {
2024                 $template->param(have_actions => 1);
2025         }
2026 }
2027
2028 sub hook (@) {
2029         my %param=@_;
2030
2031         if (! exists $param{type} || ! ref $param{call} || ! exists $param{id}) {
2032                 error 'hook requires type, call, and id parameters';
2033         }
2034
2035         return if $param{no_override} && exists $hooks{$param{type}}{$param{id}};
2036
2037         $hooks{$param{type}}{$param{id}}=\%param;
2038         return 1;
2039 }
2040
2041 sub run_hooks ($$) {
2042         # Calls the given sub for each hook of the given type,
2043         # passing it the hook function to call.
2044         my $type=shift;
2045         my $sub=shift;
2046
2047         if (exists $hooks{$type}) {
2048                 my (@first, @middle, @last);
2049                 foreach my $id (keys %{$hooks{$type}}) {
2050                         if ($hooks{$type}{$id}{first}) {
2051                                 push @first, $id;
2052                         }
2053                         elsif ($hooks{$type}{$id}{last}) {
2054                                 push @last, $id;
2055                         }
2056                         else {
2057                                 push @middle, $id;
2058                         }
2059                 }
2060                 foreach my $id (@first, @middle, @last) {
2061                         $sub->($hooks{$type}{$id}{call});
2062                 }
2063         }
2064
2065         return 1;
2066 }
2067
2068 sub rcs_update () {
2069         $hooks{rcs}{rcs_update}{call}->(@_);
2070 }
2071
2072 sub rcs_prepedit ($) {
2073         $hooks{rcs}{rcs_prepedit}{call}->(@_);
2074 }
2075
2076 sub rcs_commit (@) {
2077         $hooks{rcs}{rcs_commit}{call}->(@_);
2078 }
2079
2080 sub rcs_commit_staged (@) {
2081         $hooks{rcs}{rcs_commit_staged}{call}->(@_);
2082 }
2083
2084 sub rcs_add ($) {
2085         $hooks{rcs}{rcs_add}{call}->(@_);
2086 }
2087
2088 sub rcs_remove ($) {
2089         $hooks{rcs}{rcs_remove}{call}->(@_);
2090 }
2091
2092 sub rcs_rename ($$) {
2093         $hooks{rcs}{rcs_rename}{call}->(@_);
2094 }
2095
2096 sub rcs_recentchanges ($) {
2097         $hooks{rcs}{rcs_recentchanges}{call}->(@_);
2098 }
2099
2100 sub rcs_diff ($;$) {
2101         $hooks{rcs}{rcs_diff}{call}->(@_);
2102 }
2103
2104 sub rcs_getctime ($) {
2105         $hooks{rcs}{rcs_getctime}{call}->(@_);
2106 }
2107
2108 sub rcs_getmtime ($) {
2109         $hooks{rcs}{rcs_getmtime}{call}->(@_);
2110 }
2111
2112 sub rcs_receive () {
2113         $hooks{rcs}{rcs_receive}{call}->();
2114 }
2115
2116 sub add_depends ($$;$) {
2117         my $page=shift;
2118         my $pagespec=shift;
2119         my $deptype=shift || $DEPEND_CONTENT;
2120
2121         # Is the pagespec a simple page name?
2122         if ($pagespec =~ /$config{wiki_file_regexp}/ &&
2123             $pagespec !~ /[\s*?()!]/) {
2124                 $depends_simple{$page}{lc $pagespec} |= $deptype;
2125                 return 1;
2126         }
2127
2128         # Add explicit dependencies for influences.
2129         my $sub=pagespec_translate($pagespec);
2130         return unless defined $sub;
2131         foreach my $p (keys %pagesources) {
2132                 my $r=$sub->($p, location => $page);
2133                 my $i=$r->influences;
2134                 my $static=$r->influences_static;
2135                 foreach my $k (keys %$i) {
2136                         next unless $r || $static || $k eq $page;
2137                         $depends_simple{$page}{lc $k} |= $i->{$k};
2138                 }
2139                 last if $static;
2140         }
2141
2142         $depends{$page}{$pagespec} |= $deptype;
2143         return 1;
2144 }
2145
2146 sub deptype (@) {
2147         my $deptype=0;
2148         foreach my $type (@_) {
2149                 if ($type eq 'presence') {
2150                         $deptype |= $DEPEND_PRESENCE;
2151                 }
2152                 elsif ($type eq 'links') {
2153                         $deptype |= $DEPEND_LINKS;
2154                 }
2155                 elsif ($type eq 'content') {
2156                         $deptype |= $DEPEND_CONTENT;
2157                 }
2158         }
2159         return $deptype;
2160 }
2161
2162 my $file_prune_regexp;
2163 sub file_pruned ($) {
2164         my $file=shift;
2165
2166         if (defined $config{include} && length $config{include}) {
2167                 return 0 if $file =~ m/$config{include}/;
2168         }
2169
2170         if (! defined $file_prune_regexp) {
2171                 $file_prune_regexp='('.join('|', @{$config{wiki_file_prune_regexps}}).')';
2172                 $file_prune_regexp=qr/$file_prune_regexp/;
2173         }
2174         return $file =~ m/$file_prune_regexp/;
2175 }
2176
2177 sub define_gettext () {
2178         # If translation is needed, redefine the gettext function to do it.
2179         # Otherwise, it becomes a quick no-op.
2180         my $gettext_obj;
2181         my $getobj;
2182         if ((exists $ENV{LANG} && length $ENV{LANG}) ||
2183             (exists $ENV{LC_ALL} && length $ENV{LC_ALL}) ||
2184             (exists $ENV{LC_MESSAGES} && length $ENV{LC_MESSAGES})) {
2185                 $getobj=sub {
2186                         $gettext_obj=eval q{
2187                                 use Locale::gettext q{textdomain};
2188                                 Locale::gettext->domain('ikiwiki')
2189                         };
2190                 };
2191         }
2192
2193         no warnings 'redefine';
2194         *gettext=sub {
2195                 $getobj->() if $getobj;
2196                 if ($gettext_obj) {
2197                         $gettext_obj->get(shift);
2198                 }
2199                 else {
2200                         return shift;
2201                 }
2202         };
2203         *ngettext=sub {
2204                 $getobj->() if $getobj;
2205                 if ($gettext_obj) {
2206                         $gettext_obj->nget(@_);
2207                 }
2208                 else {
2209                         return ($_[2] == 1 ? $_[0] : $_[1])
2210                 }
2211         };
2212 }
2213
2214 sub gettext {
2215         define_gettext();
2216         gettext(@_);
2217 }
2218
2219 sub ngettext {
2220         define_gettext();
2221         ngettext(@_);
2222 }
2223
2224 sub yesno ($) {
2225         my $val=shift;
2226
2227         return (defined $val && (lc($val) eq gettext("yes") || lc($val) eq "yes" || $val eq "1"));
2228 }
2229
2230 sub inject {
2231         # Injects a new function into the symbol table to replace an
2232         # exported function.
2233         my %params=@_;
2234
2235         # This is deep ugly perl foo, beware.
2236         no strict;
2237         no warnings;
2238         if (! defined $params{parent}) {
2239                 $params{parent}='::';
2240                 $params{old}=\&{$params{name}};
2241                 $params{name}=~s/.*:://;
2242         }
2243         my $parent=$params{parent};
2244         foreach my $ns (grep /^\w+::/, keys %{$parent}) {
2245                 $ns = $params{parent} . $ns;
2246                 inject(%params, parent => $ns) unless $ns eq '::main::';
2247                 *{$ns . $params{name}} = $params{call}
2248                         if exists ${$ns}{$params{name}} &&
2249                            \&{${$ns}{$params{name}}} == $params{old};
2250         }
2251         use strict;
2252         use warnings;
2253 }
2254
2255 sub add_link ($$;$) {
2256         my $page=shift;
2257         my $link=shift;
2258         my $type=shift;
2259
2260         push @{$links{$page}}, $link
2261                 unless grep { $_ eq $link } @{$links{$page}};
2262
2263         if (defined $type) {
2264                 $typedlinks{$page}{$type}{$link} = 1;
2265         }
2266 }
2267
2268 sub add_autofile ($$$) {
2269         my $file=shift;
2270         my $plugin=shift;
2271         my $generator=shift;
2272
2273         $autofiles{$file}{plugin}=$plugin;
2274         $autofiles{$file}{generator}=$generator;
2275 }
2276
2277 sub sortspec_translate ($$) {
2278         my $spec = shift;
2279         my $reverse = shift;
2280
2281         my $code = "";
2282         my @data;
2283         while ($spec =~ m{
2284                 \s*
2285                 (-?)            # group 1: perhaps negated
2286                 \s*
2287                 (               # group 2: a word
2288                         \w+\([^\)]*\)   # command(params)
2289                         |
2290                         [^\s]+          # or anything else
2291                 )
2292                 \s*
2293         }gx) {
2294                 my $negated = $1;
2295                 my $word = $2;
2296                 my $params = undef;
2297
2298                 if ($word =~ m/^(\w+)\((.*)\)$/) {
2299                         # command with parameters
2300                         $params = $2;
2301                         $word = $1;
2302                 }
2303                 elsif ($word !~ m/^\w+$/) {
2304                         error(sprintf(gettext("invalid sort type %s"), $word));
2305                 }
2306
2307                 if (length $code) {
2308                         $code .= " || ";
2309                 }
2310
2311                 if ($negated) {
2312                         $code .= "-";
2313                 }
2314
2315                 if (exists $IkiWiki::SortSpec::{"cmp_$word"}) {
2316                         if (defined $params) {
2317                                 push @data, $params;
2318                                 $code .= "IkiWiki::SortSpec::cmp_$word(\$data[$#data])";
2319                         }
2320                         else {
2321                                 $code .= "IkiWiki::SortSpec::cmp_$word(undef)";
2322                         }
2323                 }
2324                 else {
2325                         error(sprintf(gettext("unknown sort type %s"), $word));
2326                 }
2327         }
2328
2329         if (! length $code) {
2330                 # undefined sorting method... sort arbitrarily
2331                 return sub { 0 };
2332         }
2333
2334         if ($reverse) {
2335                 $code="-($code)";
2336         }
2337
2338         no warnings;
2339         return eval 'sub { '.$code.' }';
2340 }
2341
2342 sub pagespec_translate ($) {
2343         my $spec=shift;
2344
2345         # Convert spec to perl code.
2346         my $code="";
2347         my @data;
2348         while ($spec=~m{
2349                 \s*             # ignore whitespace
2350                 (               # 1: match a single word
2351                         \!              # !
2352                 |
2353                         \(              # (
2354                 |
2355                         \)              # )
2356                 |
2357                         \w+\([^\)]*\)   # command(params)
2358                 |
2359                         [^\s()]+        # any other text
2360                 )
2361                 \s*             # ignore whitespace
2362         }gx) {
2363                 my $word=$1;
2364                 if (lc $word eq 'and') {
2365                         $code.=' &';
2366                 }
2367                 elsif (lc $word eq 'or') {
2368                         $code.=' |';
2369                 }
2370                 elsif ($word eq "(" || $word eq ")" || $word eq "!") {
2371                         $code.=' '.$word;
2372                 }
2373                 elsif ($word =~ /^(\w+)\((.*)\)$/) {
2374                         if (exists $IkiWiki::PageSpec::{"match_$1"}) {
2375                                 push @data, $2;
2376                                 $code.="IkiWiki::PageSpec::match_$1(\$page, \$data[$#data], \@_)";
2377                         }
2378                         else {
2379                                 push @data, qq{unknown function in pagespec "$word"};
2380                                 $code.="IkiWiki::ErrorReason->new(\$data[$#data])";
2381                         }
2382                 }
2383                 else {
2384                         push @data, $word;
2385                         $code.=" IkiWiki::PageSpec::match_glob(\$page, \$data[$#data], \@_)";
2386                 }
2387         }
2388
2389         if (! length $code) {
2390                 $code="IkiWiki::FailReason->new('empty pagespec')";
2391         }
2392
2393         no warnings;
2394         return eval 'sub { my $page=shift; '.$code.' }';
2395 }
2396
2397 sub pagespec_match ($$;@) {
2398         my $page=shift;
2399         my $spec=shift;
2400         my @params=@_;
2401
2402         # Backwards compatability with old calling convention.
2403         if (@params == 1) {
2404                 unshift @params, 'location';
2405         }
2406
2407         my $sub=pagespec_translate($spec);
2408         return IkiWiki::ErrorReason->new("syntax error in pagespec \"$spec\"")
2409                 if ! defined $sub;
2410         return $sub->($page, @params);
2411 }
2412
2413 sub pagespec_match_list ($$;@) {
2414         my $page=shift;
2415         my $pagespec=shift;
2416         my %params=@_;
2417
2418         # Backwards compatability with old calling convention.
2419         if (ref $page) {
2420                 print STDERR "warning: a plugin (".caller().") is using pagespec_match_list in an obsolete way, and needs to be updated\n";
2421                 $params{list}=$page;
2422                 $page=$params{location}; # ugh!
2423         }
2424
2425         my $sub=pagespec_translate($pagespec);
2426         error "syntax error in pagespec \"$pagespec\""
2427                 if ! defined $sub;
2428         my $sort=sortspec_translate($params{sort}, $params{reverse})
2429                 if defined $params{sort};
2430
2431         my @candidates;
2432         if (exists $params{list}) {
2433                 @candidates=exists $params{filter}
2434                         ? grep { ! $params{filter}->($_) } @{$params{list}}
2435                         : @{$params{list}};
2436         }
2437         else {
2438                 @candidates=exists $params{filter}
2439                         ? grep { ! $params{filter}->($_) } keys %pagesources
2440                         : keys %pagesources;
2441         }
2442
2443         # clear params, remainder is passed to pagespec
2444         $depends{$page}{$pagespec} |= ($params{deptype} || $DEPEND_CONTENT);
2445         my $num=$params{num};
2446         delete @params{qw{num deptype reverse sort filter list}};
2447
2448         # when only the top matches will be returned, it's efficient to
2449         # sort before matching to pagespec,
2450         if (defined $num && defined $sort) {
2451                 @candidates=IkiWiki::SortSpec::sort_pages(
2452                         $sort, @candidates);
2453         }
2454
2455         my @matches;
2456         my $firstfail;
2457         my $count=0;
2458         my $accum=IkiWiki::SuccessReason->new();
2459         foreach my $p (@candidates) {
2460                 my $r=$sub->($p, %params, location => $page);
2461                 error(sprintf(gettext("cannot match pages: %s"), $r))
2462                         if $r->isa("IkiWiki::ErrorReason");
2463                 unless ($r || $r->influences_static) {
2464                         $r->remove_influence($p);
2465                 }
2466                 $accum |= $r;
2467                 if ($r) {
2468                         push @matches, $p;
2469                         last if defined $num && ++$count == $num;
2470                 }
2471         }
2472
2473         # Add simple dependencies for accumulated influences.
2474         my $i=$accum->influences;
2475         foreach my $k (keys %$i) {
2476                 $depends_simple{$page}{lc $k} |= $i->{$k};
2477         }
2478
2479         # when all matches will be returned, it's efficient to
2480         # sort after matching
2481         if (! defined $num && defined $sort) {
2482                 return IkiWiki::SortSpec::sort_pages(
2483                         $sort, @matches);
2484         }
2485         else {
2486                 return @matches;
2487         }
2488 }
2489
2490 sub pagespec_valid ($) {
2491         my $spec=shift;
2492
2493         return defined pagespec_translate($spec);
2494 }
2495
2496 sub glob2re ($) {
2497         my $re=quotemeta(shift);
2498         $re=~s/\\\*/.*/g;
2499         $re=~s/\\\?/./g;
2500         return qr/^$re$/i;
2501 }
2502
2503 package IkiWiki::FailReason;
2504
2505 use overload (
2506         '""'    => sub { $_[0][0] },
2507         '0+'    => sub { 0 },
2508         '!'     => sub { bless $_[0], 'IkiWiki::SuccessReason'},
2509         '&'     => sub { $_[0]->merge_influences($_[1], 1); $_[0] },
2510         '|'     => sub { $_[1]->merge_influences($_[0]); $_[1] },
2511         fallback => 1,
2512 );
2513
2514 our @ISA = 'IkiWiki::SuccessReason';
2515
2516 package IkiWiki::SuccessReason;
2517
2518 use overload (
2519         '""'    => sub { $_[0][0] },
2520         '0+'    => sub { 1 },
2521         '!'     => sub { bless $_[0], 'IkiWiki::FailReason'},
2522         '&'     => sub { $_[1]->merge_influences($_[0], 1); $_[1] },
2523         '|'     => sub { $_[0]->merge_influences($_[1]); $_[0] },
2524         fallback => 1,
2525 );
2526
2527 sub new {
2528         my $class = shift;
2529         my $value = shift;
2530         return bless [$value, {@_}], $class;
2531 }
2532
2533 sub influences {
2534         my $this=shift;
2535         $this->[1]={@_} if @_;
2536         my %i=%{$this->[1]};
2537         delete $i{""};
2538         return \%i;
2539 }
2540
2541 sub influences_static {
2542         return ! $_[0][1]->{""};
2543 }
2544
2545 sub merge_influences {
2546         my $this=shift;
2547         my $other=shift;
2548         my $anded=shift;
2549
2550         if (! $anded || (($this || %{$this->[1]}) &&
2551                          ($other || %{$other->[1]}))) {
2552                 foreach my $influence (keys %{$other->[1]}) {
2553                         $this->[1]{$influence} |= $other->[1]{$influence};
2554                 }
2555         }
2556         else {
2557                 # influence blocker
2558                 $this->[1]={};
2559         }
2560 }
2561
2562 sub remove_influence {
2563         my $this=shift;
2564         my $torm=shift;
2565
2566         delete $this->[1]{$torm};
2567 }
2568
2569 package IkiWiki::ErrorReason;
2570
2571 our @ISA = 'IkiWiki::FailReason';
2572
2573 package IkiWiki::PageSpec;
2574
2575 sub derel ($$) {
2576         my $path=shift;
2577         my $from=shift;
2578
2579         if ($path =~ m!^\.(/|$)!) {
2580                 if ($1) {
2581                         $from=~s#/?[^/]+$## if defined $from;
2582                         $path=~s#^\./##;
2583                         $path="$from/$path" if defined $from && length $from;
2584                 }
2585                 else {
2586                         $path = $from;
2587                         $path = "" unless defined $path;
2588                 }
2589         }
2590
2591         return $path;
2592 }
2593
2594 my %glob_cache;
2595
2596 sub match_glob ($$;@) {
2597         my $page=shift;
2598         my $glob=shift;
2599         my %params=@_;
2600
2601         $glob=derel($glob, $params{location});
2602
2603         # Instead of converting the glob to a regex every time,
2604         # cache the compiled regex to save time.
2605         my $re=$glob_cache{$glob};
2606         unless (defined $re) {
2607                 $glob_cache{$glob} = $re = IkiWiki::glob2re($glob);
2608         }
2609         if ($page =~ $re) {
2610                 if (! IkiWiki::isinternal($page) || $params{internal}) {
2611                         return IkiWiki::SuccessReason->new("$glob matches $page");
2612                 }
2613                 else {
2614                         return IkiWiki::FailReason->new("$glob matches $page, but the page is an internal page");
2615                 }
2616         }
2617         else {
2618                 return IkiWiki::FailReason->new("$glob does not match $page");
2619         }
2620 }
2621
2622 sub match_internal ($$;@) {
2623         return match_glob(shift, shift, @_, internal => 1)
2624 }
2625
2626 sub match_page ($$;@) {
2627         my $page=shift;
2628         my $match=match_glob($page, shift, @_);
2629         if ($match) {
2630                 my $source=exists $IkiWiki::pagesources{$page} ?
2631                         $IkiWiki::pagesources{$page} :
2632                         $IkiWiki::delpagesources{$page};
2633                 my $type=defined $source ? IkiWiki::pagetype($source) : undef;
2634                 if (! defined $type) {
2635                         return IkiWiki::FailReason->new("$page is not a page");
2636                 }
2637         }
2638         return $match;
2639 }
2640
2641 sub match_link ($$;@) {
2642         my $page=shift;
2643         my $link=lc(shift);
2644         my %params=@_;
2645
2646         $link=derel($link, $params{location});
2647         my $from=exists $params{location} ? $params{location} : '';
2648         my $linktype=$params{linktype};
2649         my $qualifier='';
2650         if (defined $linktype) {
2651                 $qualifier=" with type $linktype";
2652         }
2653
2654         my $links = $IkiWiki::links{$page};
2655         return IkiWiki::FailReason->new("$page has no links", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2656                 unless $links && @{$links};
2657         my $bestlink = IkiWiki::bestlink($from, $link);
2658         foreach my $p (@{$links}) {
2659                 next unless (! defined $linktype || exists $IkiWiki::typedlinks{$page}{$linktype}{$p});
2660
2661                 if (length $bestlink) {
2662                         if ($bestlink eq IkiWiki::bestlink($page, $p)) {
2663                                 return IkiWiki::SuccessReason->new("$page links to $link$qualifier", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2664                         }
2665                 }
2666                 else {
2667                         if (match_glob($p, $link, %params)) {
2668                                 return IkiWiki::SuccessReason->new("$page links to page $p$qualifier, matching $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2669                         }
2670                         my ($p_rel)=$p=~/^\/?(.*)/;
2671                         $link=~s/^\///;
2672                         if (match_glob($p_rel, $link, %params)) {
2673                                 return IkiWiki::SuccessReason->new("$page links to page $p_rel$qualifier, matching $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2674                         }
2675                 }
2676         }
2677         return IkiWiki::FailReason->new("$page does not link to $link$qualifier", $page => $IkiWiki::DEPEND_LINKS, "" => 1);
2678 }
2679
2680 sub match_backlink ($$;@) {
2681         my $page=shift;
2682         my $testpage=shift;
2683         my %params=@_;
2684         if ($testpage eq '.') {
2685                 $testpage = $params{'location'}
2686         }
2687         my $ret=match_link($testpage, $page, @_);
2688         $ret->influences($testpage => $IkiWiki::DEPEND_LINKS);
2689         return $ret;
2690 }
2691
2692 sub match_created_before ($$;@) {
2693         my $page=shift;
2694         my $testpage=shift;
2695         my %params=@_;
2696
2697         $testpage=derel($testpage, $params{location});
2698
2699         if (exists $IkiWiki::pagectime{$testpage}) {
2700                 if ($IkiWiki::pagectime{$page} < $IkiWiki::pagectime{$testpage}) {
2701                         return IkiWiki::SuccessReason->new("$page created before $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2702                 }
2703                 else {
2704                         return IkiWiki::FailReason->new("$page not created before $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2705                 }
2706         }
2707         else {
2708                 return IkiWiki::ErrorReason->new("$testpage does not exist", $testpage => $IkiWiki::DEPEND_PRESENCE);
2709         }
2710 }
2711
2712 sub match_created_after ($$;@) {
2713         my $page=shift;
2714         my $testpage=shift;
2715         my %params=@_;
2716
2717         $testpage=derel($testpage, $params{location});
2718
2719         if (exists $IkiWiki::pagectime{$testpage}) {
2720                 if ($IkiWiki::pagectime{$page} > $IkiWiki::pagectime{$testpage}) {
2721                         return IkiWiki::SuccessReason->new("$page created after $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2722                 }
2723                 else {
2724                         return IkiWiki::FailReason->new("$page not created after $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2725                 }
2726         }
2727         else {
2728                 return IkiWiki::ErrorReason->new("$testpage does not exist", $testpage => $IkiWiki::DEPEND_PRESENCE);
2729         }
2730 }
2731
2732 sub match_creation_day ($$;@) {
2733         my $page=shift;
2734         my $d=shift;
2735         if ($d !~ /^\d+$/) {
2736                 return IkiWiki::ErrorReason->new("invalid day $d");
2737         }
2738         if ((localtime($IkiWiki::pagectime{$page}))[3] == $d) {
2739                 return IkiWiki::SuccessReason->new('creation_day matched');
2740         }
2741         else {
2742                 return IkiWiki::FailReason->new('creation_day did not match');
2743         }
2744 }
2745
2746 sub match_creation_month ($$;@) {
2747         my $page=shift;
2748         my $m=shift;
2749         if ($m !~ /^\d+$/) {
2750                 return IkiWiki::ErrorReason->new("invalid month $m");
2751         }
2752         if ((localtime($IkiWiki::pagectime{$page}))[4] + 1 == $m) {
2753                 return IkiWiki::SuccessReason->new('creation_month matched');
2754         }
2755         else {
2756                 return IkiWiki::FailReason->new('creation_month did not match');
2757         }
2758 }
2759
2760 sub match_creation_year ($$;@) {
2761         my $page=shift;
2762         my $y=shift;
2763         if ($y !~ /^\d+$/) {
2764                 return IkiWiki::ErrorReason->new("invalid year $y");
2765         }
2766         if ((localtime($IkiWiki::pagectime{$page}))[5] + 1900 == $y) {
2767                 return IkiWiki::SuccessReason->new('creation_year matched');
2768         }
2769         else {
2770                 return IkiWiki::FailReason->new('creation_year did not match');
2771         }
2772 }
2773
2774 sub match_user ($$;@) {
2775         shift;
2776         my $user=shift;
2777         my %params=@_;
2778
2779         if (! exists $params{user}) {
2780                 return IkiWiki::ErrorReason->new("no user specified");
2781         }
2782
2783         my $regexp=IkiWiki::glob2re($user);
2784
2785         if (defined $params{user} && $params{user}=~$regexp) {
2786                 return IkiWiki::SuccessReason->new("user is $user");
2787         }
2788         elsif (! defined $params{user}) {
2789                 return IkiWiki::FailReason->new("not logged in");
2790         }
2791         else {
2792                 return IkiWiki::FailReason->new("user is $params{user}, not $user");
2793         }
2794 }
2795
2796 sub match_admin ($$;@) {
2797         shift;
2798         shift;
2799         my %params=@_;
2800
2801         if (! exists $params{user}) {
2802                 return IkiWiki::ErrorReason->new("no user specified");
2803         }
2804
2805         if (defined $params{user} && IkiWiki::is_admin($params{user})) {
2806                 return IkiWiki::SuccessReason->new("user is an admin");
2807         }
2808         elsif (! defined $params{user}) {
2809                 return IkiWiki::FailReason->new("not logged in");
2810         }
2811         else {
2812                 return IkiWiki::FailReason->new("user is not an admin");
2813         }
2814 }
2815
2816 sub match_ip ($$;@) {
2817         shift;
2818         my $ip=shift;
2819         my %params=@_;
2820
2821         if (! exists $params{ip}) {
2822                 return IkiWiki::ErrorReason->new("no IP specified");
2823         }
2824
2825         my $regexp=IkiWiki::glob2re(lc $ip);
2826
2827         if (defined $params{ip} && lc $params{ip}=~$regexp) {
2828                 return IkiWiki::SuccessReason->new("IP is $ip");
2829         }
2830         else {
2831                 return IkiWiki::FailReason->new("IP is $params{ip}, not $ip");
2832         }
2833 }
2834
2835 package IkiWiki::SortSpec;
2836
2837 # This is in the SortSpec namespace so that the $a and $b that sort() uses
2838 # are easily available in this namespace, for cmp functions to use them.
2839 sub sort_pages {
2840         my $f=shift;
2841         sort $f @_
2842 }
2843
2844 sub cmp_title {
2845         IkiWiki::pagetitle(IkiWiki::basename($a))
2846         cmp
2847         IkiWiki::pagetitle(IkiWiki::basename($b))
2848 }
2849
2850 sub cmp_path { IkiWiki::pagetitle($a) cmp IkiWiki::pagetitle($b) }
2851 sub cmp_mtime { $IkiWiki::pagemtime{$b} <=> $IkiWiki::pagemtime{$a} }
2852 sub cmp_age { $IkiWiki::pagectime{$b} <=> $IkiWiki::pagectime{$a} }
2853
2854 1