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 @underlayfiles $lastrev};
  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 useragent
  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         only_committed_changes => {
 138                 type => "boolean",
 139                 default => 0,
 140                 description => "enable optimization of only refreshing committed changes?",
 141                 safe => 1,
 142                 rebuild => 0,
 143         },
 144         rcs => {
 145                 type => "string",
 146                 default => '',
 147                 description => "rcs backend to use",
 148                 safe => 0, # don't allow overriding
 149                 rebuild => 0,
 150         },
 151         default_plugins => {
 152                 type => "internal",
 153                 default => [qw{mdwn link inline meta htmlscrubber passwordauth
 154                                 openid signinedit lockedit conditional
 155                                 recentchanges parentlinks editpage}],
 156                 description => "plugins to enable by default",
 157                 safe => 0,
 158                 rebuild => 1,
 159         },
 160         add_plugins => {
 161                 type => "string",
 162                 default => [],
 163                 description => "plugins to add to the default configuration",
 164                 safe => 1,
 165                 rebuild => 1,
 166         },
 167         disable_plugins => {
 168                 type => "string",
 169                 default => [],
 170                 description => "plugins to disable",
 171                 safe => 1,
 172                 rebuild => 1,
 173         },
 174         templatedir => {
 175                 type => "string",
 176                 default => "$installdir/share/ikiwiki/templates",
 177                 description => "additional directory to search for template files",
 178                 advanced => 1,
 179                 safe => 0, # path
 180                 rebuild => 1,
 181         },
 182         underlaydir => {
 183                 type => "string",
 184                 default => "$installdir/share/ikiwiki/basewiki",
 185                 description => "base wiki source location",
 186                 advanced => 1,
 187                 safe => 0, # path
 188                 rebuild => 0,
 189         },
 190         underlaydirbase => {
 191                 type => "internal",
 192                 default => "$installdir/share/ikiwiki",
 193                 description => "parent directory containing additional underlays",
 194                 safe => 0,
 195                 rebuild => 0,
 196         },
 197         wrappers => {
 198                 type => "internal",
 199                 default => [],
 200                 description => "wrappers to generate",
 201                 safe => 0,
 202                 rebuild => 0,
 203         },
 204         underlaydirs => {
 205                 type => "internal",
 206                 default => [],
 207                 description => "additional underlays to use",
 208                 safe => 0,
 209                 rebuild => 0,
 210         },
 211         verbose => {
 212                 type => "boolean",
 213                 example => 1,
 214                 description => "display verbose messages?",
 215                 safe => 1,
 216                 rebuild => 0,
 217         },
 218         syslog => {
 219                 type => "boolean",
 220                 example => 1,
 221                 description => "log to syslog?",
 222                 safe => 1,
 223                 rebuild => 0,
 224         },
 225         usedirs => {
 226                 type => "boolean",
 227                 default => 1,
 228                 description => "create output files named page/index.html?",
 229                 safe => 0, # changing requires manual transition
 230                 rebuild => 1,
 231         },
 232         prefix_directives => {
 233                 type => "boolean",
 234                 default => 1,
 235                 description => "use '!'-prefixed preprocessor directives?",
 236                 safe => 0, # changing requires manual transition
 237                 rebuild => 1,
 238         },
 239         indexpages => {
 240                 type => "boolean",
 241                 default => 0,
 242                 description => "use page/index.mdwn source files",
 243                 safe => 1,
 244                 rebuild => 1,
 245         },
 246         discussion => {
 247                 type => "boolean",
 248                 default => 1,
 249                 description => "enable Discussion pages?",
 250                 safe => 1,
 251                 rebuild => 1,
 252         },
 253         discussionpage => {
 254                 type => "string",
 255                 default => gettext("Discussion"),
 256                 description => "name of Discussion pages",
 257                 safe => 1,
 258                 rebuild => 1,
 259         },
 260         html5 => {
 261                 type => "boolean",
 262                 default => 0,
 263                 description => "generate HTML5?",
 264                 advanced => 0,
 265                 safe => 1,
 266                 rebuild => 1,
 267         },
 268         sslcookie => {
 269                 type => "boolean",
 270                 default => 0,
 271                 description => "only send cookies over SSL connections?",
 272                 advanced => 1,
 273                 safe => 1,
 274                 rebuild => 0,
 275         },
 276         default_pageext => {
 277                 type => "string",
 278                 default => "mdwn",
 279                 description => "extension to use for new pages",
 280                 safe => 0, # not sanitized
 281                 rebuild => 0,
 282         },
 283         htmlext => {
 284                 type => "string",
 285                 default => "html",
 286                 description => "extension to use for html files",
 287                 safe => 0, # not sanitized
 288                 rebuild => 1,
 289         },
 290         timeformat => {
 291                 type => "string",
 292                 default => '%c',
 293                 description => "strftime format string to display date",
 294                 advanced => 1,
 295                 safe => 1,
 296                 rebuild => 1,
 297         },
 298         locale => {
 299                 type => "string",
 300                 default => undef,
 301                 example => "en_US.UTF-8",
 302                 description => "UTF-8 locale to use",
 303                 advanced => 1,
 304                 safe => 0,
 305                 rebuild => 1,
 306         },
 307         userdir => {
 308                 type => "string",
 309                 default => "",
 310                 example => "users",
 311                 description => "put user pages below specified page",
 312                 safe => 1,
 313                 rebuild => 1,
 314         },
 315         numbacklinks => {
 316                 type => "integer",
 317                 default => 10,
 318                 description => "how many backlinks to show before hiding excess (0 to show all)",
 319                 safe => 1,
 320                 rebuild => 1,
 321         },
 322         hardlink => {
 323                 type => "boolean",
 324                 default => 0,
 325                 description => "attempt to hardlink source files? (optimisation for large files)",
 326                 advanced => 1,
 327                 safe => 0, # paranoia
 328                 rebuild => 0,
 329         },
 330         umask => {
 331                 type => "string",
 332                 example => "public",
 333                 description => "force ikiwiki to use a particular umask (keywords public, group or private, or a number)",
 334                 advanced => 1,
 335                 safe => 0, # paranoia
 336                 rebuild => 0,
 337         },
 338         wrappergroup => {
 339                 type => "string",
 340                 example => "ikiwiki",
 341                 description => "group for wrappers to run in",
 342                 advanced => 1,
 343                 safe => 0, # paranoia
 344                 rebuild => 0,
 345         },
 346         libdir => {
 347                 type => "string",
 348                 default => "",
 349                 example => "$ENV{HOME}/.ikiwiki/",
 350                 description => "extra library and plugin directory",
 351                 advanced => 1,
 352                 safe => 0, # directory
 353                 rebuild => 0,
 354         },
 355         ENV => {
 356                 type => "string",
 357                 default => {},
 358                 description => "environment variables",
 359                 safe => 0, # paranoia
 360                 rebuild => 0,
 361         },
 362         timezone => {
 363                 type => "string",
 364                 default => "",
 365                 example => "US/Eastern",
 366                 description => "time zone name",
 367                 safe => 1,
 368                 rebuild => 1,
 369         },
 370         include => {
 371                 type => "string",
 372                 default => undef,
 373                 example => '^\.htaccess$',
 374                 description => "regexp of normally excluded files to include",
 375                 advanced => 1,
 376                 safe => 0, # regexp
 377                 rebuild => 1,
 378         },
 379         exclude => {
 380                 type => "string",
 381                 default => undef,
 382                 example => '^(*\.private|Makefile)$',
 383                 description => "regexp of files that should be skipped",
 384                 advanced => 1,
 385                 safe => 0, # regexp
 386                 rebuild => 1,
 387         },
 388         wiki_file_prune_regexps => {
 389                 type => "internal",
 390                 default => [qr/(^|\/)\.\.(\/|$)/, qr/^\//, qr/^\./, qr/\/\./,
 391                         qr/\.x?html?$/, qr/\.ikiwiki-new$/,
 392                         qr/(^|\/).svn\//, qr/.arch-ids\//, qr/{arch}\//,
 393                         qr/(^|\/)_MTN\//, qr/(^|\/)_darcs\//,
 394                         qr/(^|\/)CVS\//, qr/\.dpkg-tmp$/],
 395                 description => "regexps of source files to ignore",
 396                 safe => 0,
 397                 rebuild => 1,
 398         },
 399         wiki_file_chars => {
 400                 type => "string",
 401                 description => "specifies the characters that are allowed in source filenames",
 402                 default => "-[:alnum:]+/.:_",
 403                 safe => 0,
 404                 rebuild => 1,
 405         },
 406         wiki_file_regexp => {
 407                 type => "internal",
 408                 description => "regexp of legal source files",
 409                 safe => 0,
 410                 rebuild => 1,
 411         },
 412         web_commit_regexp => {
 413                 type => "internal",
 414                 default => qr/^web commit (by (.*?(?=: |$))|from ([0-9a-fA-F:.]+[0-9a-fA-F])):?(.*)/,
 415                 description => "regexp to parse web commits from logs",
 416                 safe => 0,
 417                 rebuild => 0,
 418         },
 419         cgi => {
 420                 type => "internal",
 421                 default => 0,
 422                 description => "run as a cgi",
 423                 safe => 0,
 424                 rebuild => 0,
 425         },
 426         cgi_disable_uploads => {
 427                 type => "internal",
 428                 default => 1,
 429                 description => "whether CGI should accept file uploads",
 430                 safe => 0,
 431                 rebuild => 0,
 432         },
 433         post_commit => {
 434                 type => "internal",
 435                 default => 0,
 436                 description => "run as a post-commit hook",
 437                 safe => 0,
 438                 rebuild => 0,
 439         },
 440         rebuild => {
 441                 type => "internal",
 442                 default => 0,
 443                 description => "running in rebuild mode",
 444                 safe => 0,
 445                 rebuild => 0,
 446         },
 447         setup => {
 448                 type => "internal",
 449                 default => undef,
 450                 description => "running in setup mode",
 451                 safe => 0,
 452                 rebuild => 0,
 453         },
 454         clean => {
 455                 type => "internal",
 456                 default => 0,
 457                 description => "running in clean mode",
 458                 safe => 0,
 459                 rebuild => 0,
 460         },
 461         refresh => {
 462                 type => "internal",
 463                 default => 0,
 464                 description => "running in refresh mode",
 465                 safe => 0,
 466                 rebuild => 0,
 467         },
 468         test_receive => {
 469                 type => "internal",
 470                 default => 0,
 471                 description => "running in receive test mode",
 472                 safe => 0,
 473                 rebuild => 0,
 474         },
 475         wrapper_background_command => {
 476                 type => "internal",
 477                 default => '',
 478                 description => "background shell command to run",
 479                 safe => 0,
 480                 rebuild => 0,
 481         },
 482         gettime => {
 483                 type => "internal",
 484                 description => "running in gettime mode",
 485                 safe => 0,
 486                 rebuild => 0,
 487         },
 488         w3mmode => {
 489                 type => "internal",
 490                 default => 0,
 491                 description => "running in w3mmode",
 492                 safe => 0,
 493                 rebuild => 0,
 494         },
 495         wikistatedir => {
 496                 type => "internal",
 497                 default => undef,
 498                 description => "path to the .ikiwiki directory holding ikiwiki state",
 499                 safe => 0,
 500                 rebuild => 0,
 501         },
 502         setupfile => {
 503                 type => "internal",
 504                 default => undef,
 505                 description => "path to setup file",
 506                 safe => 0,
 507                 rebuild => 0,
 508         },
 509         setuptype => {
 510                 type => "internal",
 511                 default => "Yaml",
 512                 description => "perl class to use to dump setup file",
 513                 safe => 0,
 514                 rebuild => 0,
 515         },
 516         allow_symlinks_before_srcdir => {
 517                 type => "boolean",
 518                 default => 0,
 519                 description => "allow symlinks in the path leading to the srcdir (potentially insecure)",
 520                 safe => 0,
 521                 rebuild => 0,
 522         },
 523         cookiejar => {
 524                 type => "string",
 525                 default => { file => "$ENV{HOME}/.ikiwiki/cookies" },
 526                 description => "cookie control",
 527                 safe => 0, # hooks into perl module internals
 528                 rebuild => 0,
 529         },
 530         useragent => {
 531                 type => "string",
 532                 default => undef,
 533                 example => "Wget/1.13.4 (linux-gnu)",
 534                 description => "set custom user agent string for outbound HTTP requests e.g. when fetching aggregated RSS feeds",
 535                 safe => 0,
 536                 rebuild => 0,
 537         },
 538 }
 539
 540 sub defaultconfig () {
 541         my %s=getsetup();
 542         my @ret;
 543         foreach my $key (keys %s) {
 544                 push @ret, $key, $s{$key}->{default};
 545         }
 546         return @ret;
 547 }
 548
 549 # URL to top of wiki as a path starting with /, valid from any wiki page or
 550 # the CGI; if that's not possible, an absolute URL. Either way, it ends with /
 551 my $local_url;
 552 # URL to CGI script, similar to $local_url
 553 my $local_cgiurl;
 554
 555 sub checkconfig () {
 556         # locale stuff; avoid LC_ALL since it overrides everything
 557         if (defined $ENV{LC_ALL}) {
 558                 $ENV{LANG} = $ENV{LC_ALL};
 559                 delete $ENV{LC_ALL};
 560         }
 561         if (defined $config{locale}) {
 562                 if (POSIX::setlocale(&POSIX::LC_ALL, $config{locale})) {
 563                         $ENV{LANG}=$config{locale};
 564                         define_gettext();
 565                 }
 566         }
 567
 568         if (! defined $config{wiki_file_regexp}) {
 569                 $config{wiki_file_regexp}=qr/(^[$config{wiki_file_chars}]+$)/;
 570         }
 571
 572         if (ref $config{ENV} eq 'HASH') {
 573                 foreach my $val (keys %{$config{ENV}}) {
 574                         $ENV{$val}=$config{ENV}{$val};
 575                 }
 576         }
 577         if (defined $config{timezone} && length $config{timezone}) {
 578                 $ENV{TZ}=$config{timezone};
 579         }
 580         else {
 581                 $config{timezone}=$ENV{TZ};
 582         }
 583
 584         if ($config{w3mmode}) {
 585                 eval q{use Cwd q{abs_path}};
 586                 error($@) if $@;
 587                 $config{srcdir}=possibly_foolish_untaint(abs_path($config{srcdir}));
 588                 $config{destdir}=possibly_foolish_untaint(abs_path($config{destdir}));
 589                 $config{cgiurl}="file:///\$LIB/ikiwiki-w3m.cgi/".$config{cgiurl}
 590                         unless $config{cgiurl} =~ m!file:///!;
 591                 $config{url}="file://".$config{destdir};
 592         }
 593
 594         if ($config{cgi} && ! length $config{url}) {
 595                 error(gettext("Must specify url to wiki with --url when using --cgi"));
 596         }
 597
 598         if (defined $config{url} && length $config{url}) {
 599                 eval q{use URI};
 600                 my $baseurl = URI->new($config{url});
 601
 602                 $local_url = $baseurl->path . "/";
 603                 $local_cgiurl = undef;
 604
 605                 if (length $config{cgiurl}) {
 606                         my $cgiurl = URI->new($config{cgiurl});
 607
 608                         $local_cgiurl = $cgiurl->path;
 609
 610                         if ($cgiurl->scheme ne $baseurl->scheme or
 611                                 $cgiurl->authority ne $baseurl->authority) {
 612                                 # too far apart, fall back to absolute URLs
 613                                 $local_url = "$config{url}/";
 614                                 $local_cgiurl = $config{cgiurl};
 615                         }
 616                 }
 617
 618                 $local_url =~ s{//$}{/};
 619         }
 620         else {
 621                 $local_cgiurl = $config{cgiurl};
 622         }
 623
 624         $config{wikistatedir}="$config{srcdir}/.ikiwiki"
 625                 unless exists $config{wikistatedir} && defined $config{wikistatedir};
 626
 627         if (defined $config{umask}) {
 628                 my $u = possibly_foolish_untaint($config{umask});
 629
 630                 if ($u =~ m/^\d+$/) {
 631                         umask($u);
 632                 }
 633                 elsif ($u eq 'private') {
 634                         umask(077);
 635                 }
 636                 elsif ($u eq 'group') {
 637                         umask(027);
 638                 }
 639                 elsif ($u eq 'public') {
 640                         umask(022);
 641                 }
 642                 else {
 643                         error(sprintf(gettext("unsupported umask setting %s"), $u));
 644                 }
 645         }
 646
 647         run_hooks(checkconfig => sub { shift->() });
 648
 649         return 1;
 650 }
 651
 652 sub listplugins () {
 653         my %ret;
 654
 655         foreach my $dir (@INC, $config{libdir}) {
 656                 next unless defined $dir && length $dir;
 657                 foreach my $file (glob("$dir/IkiWiki/Plugin/*.pm")) {
 658                         my ($plugin)=$file=~/.*\/(.*)\.pm$/;
 659                         $ret{$plugin}=1;
 660                 }
 661         }
 662         foreach my $dir ($config{libdir}, "$installdir/lib/ikiwiki") {
 663                 next unless defined $dir && length $dir;
 664                 foreach my $file (glob("$dir/plugins/*")) {
 665                         $ret{basename($file)}=1 if -x $file;
 666                 }
 667         }
 668
 669         return keys %ret;
 670 }
 671
 672 sub loadplugins () {
 673         if (defined $config{libdir} && length $config{libdir}) {
 674                 unshift @INC, possibly_foolish_untaint($config{libdir});
 675         }
 676
 677         foreach my $plugin (@{$config{default_plugins}}, @{$config{add_plugins}}) {
 678                 loadplugin($plugin);
 679         }
 680
 681         if ($config{rcs}) {
 682                 if (exists $hooks{rcs}) {
 683                         error(gettext("cannot use multiple rcs plugins"));
 684                 }
 685                 loadplugin($config{rcs});
 686         }
 687         if (! exists $hooks{rcs}) {
 688                 loadplugin("norcs");
 689         }
 690
 691         run_hooks(getopt => sub { shift->() });
 692         if (grep /^-/, @ARGV) {
 693                 print STDERR "Unknown option (or missing parameter): $_\n"
 694                         foreach grep /^-/, @ARGV;
 695                 usage();
 696         }
 697
 698         return 1;
 699 }
 700
 701 sub loadplugin ($;$) {
 702         my $plugin=shift;
 703         my $force=shift;
 704
 705         return if ! $force && grep { $_ eq $plugin} @{$config{disable_plugins}};
 706
 707         foreach my $dir (defined $config{libdir} ? possibly_foolish_untaint($config{libdir}) : undef,
 708                          "$installdir/lib/ikiwiki") {
 709                 if (defined $dir && -x "$dir/plugins/$plugin") {
 710                         eval { require IkiWiki::Plugin::external };
 711                         if ($@) {
 712                                 my $reason=$@;
 713                                 error(sprintf(gettext("failed to load external plugin needed for %s plugin: %s"), $plugin, $reason));
 714                         }
 715                         import IkiWiki::Plugin::external "$dir/plugins/$plugin";
 716                         $loaded_plugins{$plugin}=1;
 717                         return 1;
 718                 }
 719         }
 720
 721         my $mod="IkiWiki::Plugin::".possibly_foolish_untaint($plugin);
 722         eval qq{use $mod};
 723         if ($@) {
 724                 error("Failed to load plugin $mod: $@");
 725         }
 726         $loaded_plugins{$plugin}=1;
 727         return 1;
 728 }
 729
 730 sub error ($;$) {
 731         my $message=shift;
 732         my $cleaner=shift;
 733         log_message('err' => $message) if $config{syslog};
 734         if (defined $cleaner) {
 735                 $cleaner->();
 736         }
 737         die $message."\n";
 738 }
 739
 740 sub debug ($) {
 741         return unless $config{verbose};
 742         return log_message(debug => @_);
 743 }
 744
 745 my $log_open=0;
 746 my $log_failed=0;
 747 sub log_message ($$) {
 748         my $type=shift;
 749
 750         if ($config{syslog}) {
 751                 require Sys::Syslog;
 752                 if (! $log_open) {
 753                         Sys::Syslog::setlogsock('unix');
 754                         Sys::Syslog::openlog('ikiwiki', '', 'user');
 755                         $log_open=1;
 756                 }
 757                 eval {
 758                         # keep a copy to avoid editing the original config repeatedly
 759                         my $wikiname = $config{wikiname};
 760                         utf8::encode($wikiname);
 761                         Sys::Syslog::syslog($type, "[$wikiname] %s", join(" ", @_));
 762                 };
 763                 if ($@) {
 764                     print STDERR "failed to syslog: $@" unless $log_failed;
 765                     $log_failed=1;
 766                     print STDERR "@_\n";
 767                 }
 768                 return $@;
 769         }
 770         elsif (! $config{cgi}) {
 771                 return print "@_\n";
 772         }
 773         else {
 774                 return print STDERR "@_\n";
 775         }
 776 }
 777
 778 sub possibly_foolish_untaint ($) {
 779         my $tainted=shift;
 780         my ($untainted)=$tainted=~/(.*)/s;
 781         return $untainted;
 782 }
 783
 784 sub basename ($) {
 785         my $file=shift;
 786
 787         $file=~s!.*/+!!;
 788         return $file;
 789 }
 790
 791 sub dirname ($) {
 792         my $file=shift;
 793
 794         $file=~s!/*[^/]+$!!;
 795         return $file;
 796 }
 797
 798 sub isinternal ($) {
 799         my $page=shift;
 800         return exists $pagesources{$page} &&
 801                 $pagesources{$page} =~ /\._([^.]+)$/;
 802 }
 803
 804 sub pagetype ($) {
 805         my $file=shift;
 806
 807         if ($file =~ /\.([^.]+)$/) {
 808                 return $1 if exists $hooks{htmlize}{$1};
 809         }
 810         my $base=basename($file);
 811         if (exists $hooks{htmlize}{$base} &&
 812             $hooks{htmlize}{$base}{noextension}) {
 813                 return $base;
 814         }
 815         return;
 816 }
 817
 818 my %pagename_cache;
 819
 820 sub pagename ($) {
 821         my $file=shift;
 822
 823         if (exists $pagename_cache{$file}) {
 824                 return $pagename_cache{$file};
 825         }
 826
 827         my $type=pagetype($file);
 828         my $page=$file;
 829         $page=~s/\Q.$type\E*$//
 830                 if defined $type && !$hooks{htmlize}{$type}{keepextension}
 831                         && !$hooks{htmlize}{$type}{noextension};
 832         if ($config{indexpages} && $page=~/(.*)\/index$/) {
 833                 $page=$1;
 834         }
 835
 836         $pagename_cache{$file} = $page;
 837         return $page;
 838 }
 839
 840 sub newpagefile ($$) {
 841         my $page=shift;
 842         my $type=shift;
 843
 844         if (! $config{indexpages} || $page eq 'index') {
 845                 return $page.".".$type;
 846         }
 847         else {
 848                 return $page."/index.".$type;
 849         }
 850 }
 851
 852 sub targetpage ($$;$) {
 853         my $page=shift;
 854         my $ext=shift;
 855         my $filename=shift;
 856
 857         if (defined $filename) {
 858                 return $page."/".$filename.".".$ext;
 859         }
 860         elsif (! $config{usedirs} || $page eq 'index') {
 861                 return $page.".".$ext;
 862         }
 863         else {
 864                 return $page."/index.".$ext;
 865         }
 866 }
 867
 868 sub htmlpage ($) {
 869         my $page=shift;
 870
 871         return targetpage($page, $config{htmlext});
 872 }
 873
 874 sub srcfile_stat {
 875         my $file=shift;
 876         my $nothrow=shift;
 877
 878         return "$config{srcdir}/$file", stat(_) if -e "$config{srcdir}/$file";
 879         foreach my $dir (@{$config{underlaydirs}}, $config{underlaydir}) {
 880                 return "$dir/$file", stat(_) if -e "$dir/$file";
 881         }
 882         error("internal error: $file cannot be found in $config{srcdir} or underlay") unless $nothrow;
 883         return;
 884 }
 885
 886 sub srcfile ($;$) {
 887         return (srcfile_stat(@_))[0];
 888 }
 889
 890 sub add_literal_underlay ($) {
 891         my $dir=shift;
 892
 893         if (! grep { $_ eq $dir } @{$config{underlaydirs}}) {
 894                 unshift @{$config{underlaydirs}}, $dir;
 895         }
 896 }
 897
 898 sub add_underlay ($) {
 899         my $dir = shift;
 900
 901         if ($dir !~ /^\//) {
 902                 $dir="$config{underlaydirbase}/$dir";
 903         }
 904
 905         add_literal_underlay($dir);
 906         # why does it return 1? we just don't know
 907         return 1;
 908 }
 909
 910 sub readfile ($;$$) {
 911         my $file=shift;
 912         my $binary=shift;
 913         my $wantfd=shift;
 914
 915         if (-l $file) {
 916                 error("cannot read a symlink ($file)");
 917         }
 918
 919         local $/=undef;
 920         open (my $in, "<", $file) || error("failed to read $file: $!");
 921         binmode($in) if ($binary);
 922         return \*$in if $wantfd;
 923         my $ret=<$in>;
 924         # check for invalid utf-8, and toss it back to avoid crashes
 925         if (! utf8::valid($ret)) {
 926                 $ret=encode_utf8($ret);
 927         }
 928         close $in || error("failed to read $file: $!");
 929         return $ret;
 930 }
 931
 932 sub prep_writefile ($$) {
 933         my $file=shift;
 934         my $destdir=shift;
 935
 936         my $test=$file;
 937         while (length $test) {
 938                 if (-l "$destdir/$test") {
 939                         error("cannot write to a symlink ($test)");
 940                 }
 941                 if (-f _ && $test ne $file) {
 942                         # Remove conflicting file.
 943                         foreach my $p (keys %renderedfiles, keys %oldrenderedfiles) {
 944                                 foreach my $f (@{$renderedfiles{$p}}, @{$oldrenderedfiles{$p}}) {
 945                                         if ($f eq $test) {
 946                                                 unlink("$destdir/$test");
 947                                                 last;
 948                                         }
 949                                 }
 950                         }
 951                 }
 952                 $test=dirname($test);
 953         }
 954
 955         my $dir=dirname("$destdir/$file");
 956         if (! -d $dir) {
 957                 my $d="";
 958                 foreach my $s (split(m!/+!, $dir)) {
 959                         $d.="$s/";
 960                         if (! -d $d) {
 961                                 mkdir($d) || error("failed to create directory $d: $!");
 962                         }
 963                 }
 964         }
 965
 966         return 1;
 967 }
 968
 969 sub writefile ($$$;$$) {
 970         my $file=shift; # can include subdirs
 971         my $destdir=shift; # directory to put file in
 972         my $content=shift;
 973         my $binary=shift;
 974         my $writer=shift;
 975
 976         prep_writefile($file, $destdir);
 977
 978         my $newfile="$destdir/$file.ikiwiki-new";
 979         if (-l $newfile) {
 980                 error("cannot write to a symlink ($newfile)");
 981         }
 982
 983         my $cleanup = sub { unlink($newfile) };
 984         open (my $out, '>', $newfile) || error("failed to write $newfile: $!", $cleanup);
 985         binmode($out) if ($binary);
 986         if ($writer) {
 987                 $writer->(\*$out, $cleanup);
 988         }
 989         else {
 990                 print $out $content or error("failed writing to $newfile: $!", $cleanup);
 991         }
 992         close $out || error("failed saving $newfile: $!", $cleanup);
 993         rename($newfile, "$destdir/$file") ||
 994                 error("failed renaming $newfile to $destdir/$file: $!", $cleanup);
 995
 996         return 1;
 997 }
 998
 999 my %cleared;
1000 sub will_render ($$;$) {
1001         my $page=shift;
1002         my $dest=shift;
1003         my $clear=shift;
1004
1005         # Important security check for independently created files.
1006         if (-e "$config{destdir}/$dest" && ! $config{rebuild} &&
1007             ! grep { $_ eq $dest } (@{$renderedfiles{$page}}, @{$oldrenderedfiles{$page}}, @{$wikistate{editpage}{previews}})) {
1008                 my $from_other_page=0;
1009                 # Expensive, but rarely runs.
1010                 foreach my $p (keys %renderedfiles, keys %oldrenderedfiles) {
1011                         if (grep {
1012                                 $_ eq $dest ||
1013                                 dirname($_) eq $dest
1014                             } @{$renderedfiles{$p}}, @{$oldrenderedfiles{$p}}) {
1015                                 $from_other_page=1;
1016                                 last;
1017                         }
1018                 }
1019
1020                 error("$config{destdir}/$dest independently created, not overwriting with version from $page")
1021                         unless $from_other_page;
1022         }
1023
1024         # If $dest exists as a directory, remove conflicting files in it
1025         # rendered from other pages.
1026         if (-d _) {
1027                 foreach my $p (keys %renderedfiles, keys %oldrenderedfiles) {
1028                         foreach my $f (@{$renderedfiles{$p}}, @{$oldrenderedfiles{$p}}) {
1029                                 if (dirname($f) eq $dest) {
1030                                         unlink("$config{destdir}/$f");
1031                                         rmdir(dirname("$config{destdir}/$f"));
1032                                 }
1033                         }
1034                 }
1035         }
1036
1037         if (! $clear || $cleared{$page}) {
1038                 $renderedfiles{$page}=[$dest, grep { $_ ne $dest } @{$renderedfiles{$page}}];
1039         }
1040         else {
1041                 foreach my $old (@{$renderedfiles{$page}}) {
1042                         delete $destsources{$old};
1043                 }
1044                 $renderedfiles{$page}=[$dest];
1045                 $cleared{$page}=1;
1046         }
1047         $destsources{$dest}=$page;
1048
1049         return 1;
1050 }
1051
1052 sub bestlink ($$) {
1053         my $page=shift;
1054         my $link=shift;
1055
1056         my $cwd=$page;
1057         if ($link=~s/^\/+//) {
1058                 # absolute links
1059                 $cwd="";
1060         }
1061         $link=~s/\/$//;
1062
1063         do {
1064                 my $l=$cwd;
1065                 $l.="/" if length $l;
1066                 $l.=$link;
1067
1068                 if (exists $pagesources{$l}) {
1069                         return $l;
1070                 }
1071                 elsif (exists $pagecase{lc $l}) {
1072                         return $pagecase{lc $l};
1073                 }
1074         } while $cwd=~s{/?[^/]+$}{};
1075
1076         if (length $config{userdir}) {
1077                 my $l = "$config{userdir}/".lc($link);
1078                 if (exists $pagesources{$l}) {
1079                         return $l;
1080                 }
1081                 elsif (exists $pagecase{lc $l}) {
1082                         return $pagecase{lc $l};
1083                 }
1084         }
1085
1086         #print STDERR "warning: page $page, broken link: $link\n";
1087         return "";
1088 }
1089
1090 sub isinlinableimage ($) {
1091         my $file=shift;
1092
1093         return $file =~ /\.(png|gif|jpg|jpeg|svg)$/i;
1094 }
1095
1096 sub pagetitle ($;$) {
1097         my $page=shift;
1098         my $unescaped=shift;
1099
1100         if ($unescaped) {
1101                 $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : chr($2)/eg;
1102         }
1103         else {
1104                 $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : "&#$2;"/eg;
1105         }
1106
1107         return $page;
1108 }
1109
1110 sub titlepage ($) {
1111         my $title=shift;
1112         # support use w/o %config set
1113         my $chars = defined $config{wiki_file_chars} ? $config{wiki_file_chars} : "-[:alnum:]+/.:_";
1114         $title=~s/([^$chars]|_)/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
1115         return $title;
1116 }
1117
1118 sub linkpage ($) {
1119         my $link=shift;
1120         my $chars = defined $config{wiki_file_chars} ? $config{wiki_file_chars} : "-[:alnum:]+/.:_";
1121         $link=~s/([^$chars])/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
1122         return $link;
1123 }
1124
1125 sub cgiurl (@) {
1126         my %params=@_;
1127
1128         my $cgiurl=$local_cgiurl;
1129
1130         if (exists $params{cgiurl}) {
1131                 $cgiurl=$params{cgiurl};
1132                 delete $params{cgiurl};
1133         }
1134
1135         unless (%params) {
1136                 return $cgiurl;
1137         }
1138
1139         return $cgiurl."?".
1140                 join("&amp;", map $_."=".uri_escape_utf8($params{$_}), keys %params);
1141 }
1142
1143 sub cgiurl_abs (@) {
1144         eval q{use URI};
1145         URI->new_abs(cgiurl(@_), $config{cgiurl});
1146 }
1147
1148 sub baseurl (;$) {
1149         my $page=shift;
1150
1151         return $local_url if ! defined $page;
1152
1153         $page=htmlpage($page);
1154         $page=~s/[^\/]+$//;
1155         $page=~s/[^\/]+\//..\//g;
1156         return $page;
1157 }
1158
1159 sub urlabs ($$) {
1160         my $url=shift;
1161         my $urlbase=shift;
1162
1163         return $url unless defined $urlbase && length $urlbase;
1164
1165         eval q{use URI};
1166         URI->new_abs($url, $urlbase)->as_string;
1167 }
1168
1169 sub abs2rel ($$) {
1170         # Work around very innefficient behavior in File::Spec if abs2rel
1171         # is passed two relative paths. It's much faster if paths are
1172         # absolute! (Debian bug #376658; fixed in debian unstable now)
1173         my $path="/".shift;
1174         my $base="/".shift;
1175
1176         require File::Spec;
1177         my $ret=File::Spec->abs2rel($path, $base);
1178         $ret=~s/^// if defined $ret;
1179         return $ret;
1180 }
1181
1182 sub displaytime ($;$$) {
1183         # Plugins can override this function to mark up the time to
1184         # display.
1185         my $time=formattime($_[0], $_[1]);
1186         if ($config{html5}) {
1187                 return '<time datetime="'.date_3339($_[0]).'"'.
1188                         ($_[2] ? ' pubdate="pubdate"' : '').
1189                         '>'.$time.'</time>';
1190         }
1191         else {
1192                 return '<span class="date">'.$time.'</span>';
1193         }
1194 }
1195
1196 sub formattime ($;$) {
1197         # Plugins can override this function to format the time.
1198         my $time=shift;
1199         my $format=shift;
1200         if (! defined $format) {
1201                 $format=$config{timeformat};
1202         }
1203
1204         return strftime_utf8($format, localtime($time));
1205 }
1206
1207 my $strftime_encoding;
1208 sub strftime_utf8 {
1209         # strftime doesn't know about encodings, so make sure
1210         # its output is properly treated as utf8.
1211         # Note that this does not handle utf-8 in the format string.
1212         ($strftime_encoding) = POSIX::setlocale(&POSIX::LC_TIME) =~ m#\.([^@]+)#
1213                 unless defined $strftime_encoding;
1214         $strftime_encoding
1215                 ? Encode::decode($strftime_encoding, POSIX::strftime(@_))
1216                 : POSIX::strftime(@_);
1217 }
1218
1219 sub date_3339 ($) {
1220         my $time=shift;
1221
1222         my $lc_time=POSIX::setlocale(&POSIX::LC_TIME);
1223         POSIX::setlocale(&POSIX::LC_TIME, "C");
1224         my $ret=POSIX::strftime("%Y-%m-%dT%H:%M:%SZ", gmtime($time));
1225         POSIX::setlocale(&POSIX::LC_TIME, $lc_time);
1226         return $ret;
1227 }
1228
1229 sub beautify_urlpath ($) {
1230         my $url=shift;
1231
1232         # Ensure url is not an empty link, and if necessary,
1233         # add ./ to avoid colon confusion.
1234         if ($url !~ /^\// && $url !~ /^\.\.?\//) {
1235                 $url="./$url";
1236         }
1237
1238         if ($config{usedirs}) {
1239                 $url =~ s!/index.$config{htmlext}$!/!;
1240         }
1241
1242         return $url;
1243 }
1244
1245 sub urlto ($;$$) {
1246         my $to=shift;
1247         my $from=shift;
1248         my $absolute=shift;
1249
1250         if (! length $to) {
1251                 $to = 'index';
1252         }
1253
1254         if (! $destsources{$to}) {
1255                 $to=htmlpage($to);
1256         }
1257
1258         if ($absolute) {
1259                 return $config{url}.beautify_urlpath("/".$to);
1260         }
1261
1262         if (! defined $from) {
1263                 my $u = $local_url || '';
1264                 $u =~ s{/$}{};
1265                 return $u.beautify_urlpath("/".$to);
1266         }
1267
1268         my $link = abs2rel($to, dirname(htmlpage($from)));
1269
1270         return beautify_urlpath($link);
1271 }
1272
1273 sub isselflink ($$) {
1274         # Plugins can override this function to support special types
1275         # of selflinks.
1276         my $page=shift;
1277         my $link=shift;
1278
1279         return $page eq $link;
1280 }
1281
1282 sub htmllink ($$$;@) {
1283         my $lpage=shift; # the page doing the linking
1284         my $page=shift; # the page that will contain the link (different for inline)
1285         my $link=shift;
1286         my %opts=@_;
1287
1288         $link=~s/\/$//;
1289
1290         my $bestlink;
1291         if (! $opts{forcesubpage}) {
1292                 $bestlink=bestlink($lpage, $link);
1293         }
1294         else {
1295                 $bestlink="$lpage/".lc($link);
1296         }
1297
1298         my $linktext;
1299         if (defined $opts{linktext}) {
1300                 $linktext=$opts{linktext};
1301         }
1302         else {
1303                 $linktext=pagetitle(basename($link));
1304         }
1305
1306         return "<span class=\"selflink\">$linktext</span>"
1307                 if length $bestlink && isselflink($page, $bestlink) &&
1308                    ! defined $opts{anchor};
1309
1310         if (! $destsources{$bestlink}) {
1311                 $bestlink=htmlpage($bestlink);
1312
1313                 if (! $destsources{$bestlink}) {
1314                         my $cgilink = "";
1315                         if (length $config{cgiurl}) {
1316                                 $cgilink = "<a href=\"".
1317                                         cgiurl(
1318                                                 do => "create",
1319                                                 page => $link,
1320                                                 from => $lpage
1321                                         )."\" rel=\"nofollow\">?</a>";
1322                         }
1323                         return "<span class=\"createlink\">$cgilink$linktext</span>"
1324                 }
1325         }
1326
1327         $bestlink=abs2rel($bestlink, dirname(htmlpage($page)));
1328         $bestlink=beautify_urlpath($bestlink);
1329
1330         if (! $opts{noimageinline} && isinlinableimage($bestlink)) {
1331                 return "<img src=\"$bestlink\" alt=\"$linktext\" />";
1332         }
1333
1334         if (defined $opts{anchor}) {
1335                 $bestlink.="#".$opts{anchor};
1336         }
1337
1338         my @attrs;
1339         foreach my $attr (qw{rel class title}) {
1340                 if (defined $opts{$attr}) {
1341                         push @attrs, " $attr=\"$opts{$attr}\"";
1342                 }
1343         }
1344
1345         return "<a href=\"$bestlink\"@attrs>$linktext</a>";
1346 }
1347
1348 sub userpage ($) {
1349         my $user=shift;
1350         return length $config{userdir} ? "$config{userdir}/$user" : $user;
1351 }
1352
1353 sub openiduser ($) {
1354         my $user=shift;
1355
1356         if (defined $user && $user =~ m!^https?://! &&
1357             eval q{use Net::OpenID::VerifiedIdentity; 1} && !$@) {
1358                 my $display;
1359
1360                 if (Net::OpenID::VerifiedIdentity->can("DisplayOfURL")) {
1361                         $display = Net::OpenID::VerifiedIdentity::DisplayOfURL($user);
1362                 }
1363                 else {
1364                         # backcompat with old version
1365                         my $oid=Net::OpenID::VerifiedIdentity->new(identity => $user);
1366                         $display=$oid->display;
1367                 }
1368
1369                 # Convert "user.somehost.com" to "user [somehost.com]"
1370                 # (also "user.somehost.co.uk")
1371                 if ($display !~ /\[/) {
1372                         $display=~s/^([-a-zA-Z0-9]+?)\.([-.a-zA-Z0-9]+\.[a-z]+)$/$1 [$2]/;
1373                 }
1374                 # Convert "http://somehost.com/user" to "user [somehost.com]".
1375                 # (also "https://somehost.com/user/")
1376                 if ($display !~ /\[/) {
1377                         $display=~s/^https?:\/\/(.+)\/([^\/#?]+)\/?(?:[#?].*)?$/$2 [$1]/;
1378                 }
1379                 $display=~s!^https?://!!; # make sure this is removed
1380                 eval q{use CGI 'escapeHTML'};
1381                 error($@) if $@;
1382                 return escapeHTML($display);
1383         }
1384         return;
1385 }
1386
1387 sub htmlize ($$$$) {
1388         my $page=shift;
1389         my $destpage=shift;
1390         my $type=shift;
1391         my $content=shift;
1392
1393         my $oneline = $content !~ /\n/;
1394
1395         if (exists $hooks{htmlize}{$type}) {
1396                 $content=$hooks{htmlize}{$type}{call}->(
1397                         page => $page,
1398                         content => $content,
1399                 );
1400         }
1401         else {
1402                 error("htmlization of $type not supported");
1403         }
1404
1405         run_hooks(sanitize => sub {
1406                 $content=shift->(
1407                         page => $page,
1408                         destpage => $destpage,
1409                         content => $content,
1410                 );
1411         });
1412
1413         if ($oneline) {
1414                 # hack to get rid of enclosing junk added by markdown
1415                 # and other htmlizers/sanitizers
1416                 $content=~s/^<p>//i;
1417                 $content=~s/<\/p>\n*$//i;
1418         }
1419
1420         return $content;
1421 }
1422
1423 sub linkify ($$$) {
1424         my $page=shift;
1425         my $destpage=shift;
1426         my $content=shift;
1427
1428         run_hooks(linkify => sub {
1429                 $content=shift->(
1430                         page => $page,
1431                         destpage => $destpage,
1432                         content => $content,
1433                 );
1434         });
1435
1436         return $content;
1437 }
1438
1439 our %preprocessing;
1440 our $preprocess_preview=0;
1441 sub preprocess ($$$;$$) {
1442         my $page=shift; # the page the data comes from
1443         my $destpage=shift; # the page the data will appear in (different for inline)
1444         my $content=shift;
1445         my $scan=shift;
1446         my $preview=shift;
1447
1448         # Using local because it needs to be set within any nested calls
1449         # of this function.
1450         local $preprocess_preview=$preview if defined $preview;
1451
1452         my $handle=sub {
1453                 my $escape=shift;
1454                 my $prefix=shift;
1455                 my $command=shift;
1456                 my $params=shift;
1457                 $params="" if ! defined $params;
1458
1459                 if (length $escape) {
1460                         return "[[$prefix$command $params]]";
1461                 }
1462                 elsif (exists $hooks{preprocess}{$command}) {
1463                         return "" if $scan && ! $hooks{preprocess}{$command}{scan};
1464                         # Note: preserve order of params, some plugins may
1465                         # consider it significant.
1466                         my @params;
1467                         while ($params =~ m{
1468                                 (?:([-.\w]+)=)?         # 1: named parameter key?
1469                                 (?:
1470                                         """(.*?)"""     # 2: triple-quoted value
1471                                 |
1472                                         "([^"]*?)"      # 3: single-quoted value
1473                                 |
1474                                         '''(.*?)'''     # 4: triple-single-quote
1475                                 |
1476                                         <<([a-zA-Z]+)\n # 5: heredoc start
1477                                         (.*?)\n\5       # 6: heredoc value
1478                                 |
1479                                         (\S+)           # 7: unquoted value
1480                                 )
1481                                 (?:\s+|$)               # delimiter to next param
1482                         }msgx) {
1483                                 my $key=$1;
1484                                 my $val;
1485                                 if (defined $2) {
1486                                         $val=$2;
1487                                         $val=~s/\r\n/\n/mg;
1488                                         $val=~s/^\n+//g;
1489                                         $val=~s/\n+$//g;
1490                                 }
1491                                 elsif (defined $3) {
1492                                         $val=$3;
1493                                 }
1494                                 elsif (defined $4) {
1495                                         $val=$4;
1496                                 }
1497                                 elsif (defined $7) {
1498                                         $val=$7;
1499                                 }
1500                                 elsif (defined $6) {
1501                                         $val=$6;
1502                                 }
1503
1504                                 if (defined $key) {
1505                                         push @params, $key, $val;
1506                                 }
1507                                 else {
1508                                         push @params, $val, '';
1509                                 }
1510                         }
1511                         if ($preprocessing{$page}++ > 8) {
1512                                 # Avoid loops of preprocessed pages preprocessing
1513                                 # other pages that preprocess them, etc.
1514                                 return "[[!$command <span class=\"error\">".
1515                                         sprintf(gettext("preprocessing loop detected on %s at depth %i"),
1516                                                 $page, $preprocessing{$page}).
1517                                         "</span>]]";
1518                         }
1519                         my $ret;
1520                         if (! $scan) {
1521                                 $ret=eval {
1522                                         $hooks{preprocess}{$command}{call}->(
1523                                                 @params,
1524                                                 page => $page,
1525                                                 destpage => $destpage,
1526                                                 preview => $preprocess_preview,
1527                                         );
1528                                 };
1529                                 if ($@) {
1530                                         my $error=$@;
1531                                         chomp $error;
1532                                         $ret="[[!$command <span class=\"error\">".
1533                                                 gettext("Error").": $error"."</span>]]";
1534                                 }
1535                         }
1536                         else {
1537                                 # use void context during scan pass
1538                                 eval {
1539                                         $hooks{preprocess}{$command}{call}->(
1540                                                 @params,
1541                                                 page => $page,
1542                                                 destpage => $destpage,
1543                                                 preview => $preprocess_preview,
1544                                         );
1545                                 };
1546                                 $ret="";
1547                         }
1548                         $preprocessing{$page}--;
1549                         return $ret;
1550                 }
1551                 else {
1552                         return "[[$prefix$command $params]]";
1553                 }
1554         };
1555
1556         my $regex;
1557         if ($config{prefix_directives}) {
1558                 $regex = qr{
1559                         (\\?)           # 1: escape?
1560                         \[\[(!)         # directive open; 2: prefix
1561                         ([-\w]+)        # 3: command
1562                         (               # 4: the parameters..
1563                                 \s+     # Must have space if parameters present
1564                                 (?:
1565                                         (?:[-.\w]+=)?           # named parameter key?
1566                                         (?:
1567                                                 """.*?"""       # triple-quoted value
1568                                                 |
1569                                                 "[^"]*?"        # single-quoted value
1570                                                 |
1571                                                 '''.*?'''       # triple-single-quote
1572                                                 |
1573                                                 <<([a-zA-Z]+)\n # 5: heredoc start
1574                                                 (?:.*?)\n\5     # heredoc value
1575                                                 |
1576                                                 [^"\s\]]+       # unquoted value
1577                                         )
1578                                         \s*                     # whitespace or end
1579                                                                 # of directive
1580                                 )
1581                         *)?             # 0 or more parameters
1582                         \]\]            # directive closed
1583                 }sx;
1584         }
1585         else {
1586                 $regex = qr{
1587                         (\\?)           # 1: escape?
1588                         \[\[(!?)        # directive open; 2: optional prefix
1589                         ([-\w]+)        # 3: command
1590                         \s+
1591                         (               # 4: the parameters..
1592                                 (?:
1593                                         (?:[-.\w]+=)?           # named parameter key?
1594                                         (?:
1595                                                 """.*?"""       # triple-quoted value
1596                                                 |
1597                                                 "[^"]*?"        # single-quoted value
1598                                                 |
1599                                                 '''.*?'''       # triple-single-quote
1600                                                 |
1601                                                 <<([a-zA-Z]+)\n # 5: heredoc start
1602                                                 (?:.*?)\n\5     # heredoc value
1603                                                 |
1604                                                 [^"\s\]]+       # unquoted value
1605                                         )
1606                                         \s*                     # whitespace or end
1607                                                                 # of directive
1608                                 )
1609                         *)              # 0 or more parameters
1610                         \]\]            # directive closed
1611                 }sx;
1612         }
1613
1614         $content =~ s{$regex}{$handle->($1, $2, $3, $4)}eg;
1615         return $content;
1616 }
1617
1618 sub filter ($$$) {
1619         my $page=shift;
1620         my $destpage=shift;
1621         my $content=shift;
1622
1623         run_hooks(filter => sub {
1624                 $content=shift->(page => $page, destpage => $destpage,
1625                         content => $content);
1626         });
1627
1628         return $content;
1629 }
1630
1631 sub check_canedit ($$$;$) {
1632         my $page=shift;
1633         my $q=shift;
1634         my $session=shift;
1635         my $nonfatal=shift;
1636
1637         my $canedit;
1638         run_hooks(canedit => sub {
1639                 return if defined $canedit;
1640                 my $ret=shift->($page, $q, $session);
1641                 if (defined $ret) {
1642                         if ($ret eq "") {
1643                                 $canedit=1;
1644                         }
1645                         elsif (ref $ret eq 'CODE') {
1646                                 $ret->() unless $nonfatal;
1647                                 $canedit=0;
1648                         }
1649                         elsif (defined $ret) {
1650                                 error($ret) unless $nonfatal;
1651                                 $canedit=0;
1652                         }
1653                 }
1654         });
1655         return defined $canedit ? $canedit : 1;
1656 }
1657
1658 sub check_content (@) {
1659         my %params=@_;
1660
1661         return 1 if ! exists $hooks{checkcontent}; # optimisation
1662
1663         if (exists $pagesources{$params{page}}) {
1664                 my @diff;
1665                 my %old=map { $_ => 1 }
1666                         split("\n", readfile(srcfile($pagesources{$params{page}})));
1667                 foreach my $line (split("\n", $params{content})) {
1668                         push @diff, $line if ! exists $old{$line};
1669                 }
1670                 $params{diff}=join("\n", @diff);
1671         }
1672
1673         my $ok;
1674         run_hooks(checkcontent => sub {
1675                 return if defined $ok;
1676                 my $ret=shift->(%params);
1677                 if (defined $ret) {
1678                         if ($ret eq "") {
1679                                 $ok=1;
1680                         }
1681                         elsif (ref $ret eq 'CODE') {
1682                                 $ret->() unless $params{nonfatal};
1683                                 $ok=0;
1684                         }
1685                         elsif (defined $ret) {
1686                                 error($ret) unless $params{nonfatal};
1687                                 $ok=0;
1688                         }
1689                 }
1690
1691         });
1692         return defined $ok ? $ok : 1;
1693 }
1694
1695 sub check_canchange (@) {
1696         my %params = @_;
1697         my $cgi = $params{cgi};
1698         my $session = $params{session};
1699         my @changes = @{$params{changes}};
1700
1701         my %newfiles;
1702         foreach my $change (@changes) {
1703                 # This untaint is safe because we check file_pruned and
1704                 # wiki_file_regexp.
1705                 my ($file)=$change->{file}=~/$config{wiki_file_regexp}/;
1706                 $file=possibly_foolish_untaint($file);
1707                 if (! defined $file || ! length $file ||
1708                     file_pruned($file)) {
1709                         error(gettext("bad file name %s"), $file);
1710                 }
1711
1712                 my $type=pagetype($file);
1713                 my $page=pagename($file) if defined $type;
1714
1715                 if ($change->{action} eq 'add') {
1716                         $newfiles{$file}=1;
1717                 }
1718
1719                 if ($change->{action} eq 'change' ||
1720                     $change->{action} eq 'add') {
1721                         if (defined $page) {
1722                                 check_canedit($page, $cgi, $session);
1723                                 next;
1724                         }
1725                         else {
1726                                 if (IkiWiki::Plugin::attachment->can("check_canattach")) {
1727                                         IkiWiki::Plugin::attachment::check_canattach($session, $file, $change->{path});
1728                                         check_canedit($file, $cgi, $session);
1729                                         next;
1730                                 }
1731                         }
1732                 }
1733                 elsif ($change->{action} eq 'remove') {
1734                         # check_canremove tests to see if the file is present
1735                         # on disk. This will fail when a single commit adds a
1736                         # file and then removes it again. Avoid the problem
1737                         # by not testing the removal in such pairs of changes.
1738                         # (The add is still tested, just to make sure that
1739                         # no data is added to the repo that a web edit
1740                         # could not add.)
1741                         next if $newfiles{$file};
1742
1743                         if (IkiWiki::Plugin::remove->can("check_canremove")) {
1744                                 IkiWiki::Plugin::remove::check_canremove(defined $page ? $page : $file, $cgi, $session);
1745                                 check_canedit(defined $page ? $page : $file, $cgi, $session);
1746                                 next;
1747                         }
1748                 }
1749                 else {
1750                         error "unknown action ".$change->{action};
1751                 }
1752
1753                 error sprintf(gettext("you are not allowed to change %s"), $file);
1754         }
1755 }
1756
1757
1758 my $wikilock;
1759
1760 sub lockwiki () {
1761         # Take an exclusive lock on the wiki to prevent multiple concurrent
1762         # run issues. The lock will be dropped on program exit.
1763         if (! -d $config{wikistatedir}) {
1764                 mkdir($config{wikistatedir});
1765         }
1766         open($wikilock, '>', "$config{wikistatedir}/lockfile") ||
1767                 error ("cannot write to $config{wikistatedir}/lockfile: $!");
1768         if (! flock($wikilock, 2)) { # LOCK_EX
1769                 error("failed to get lock");
1770         }
1771         return 1;
1772 }
1773
1774 sub unlockwiki () {
1775         POSIX::close($ENV{IKIWIKI_CGILOCK_FD}) if exists $ENV{IKIWIKI_CGILOCK_FD};
1776         return close($wikilock) if $wikilock;
1777         return;
1778 }
1779
1780 my $commitlock;
1781
1782 sub commit_hook_enabled () {
1783         open($commitlock, '+>', "$config{wikistatedir}/commitlock") ||
1784                 error("cannot write to $config{wikistatedir}/commitlock: $!");
1785         if (! flock($commitlock, 1 | 4)) { # LOCK_SH | LOCK_NB to test
1786                 close($commitlock) || error("failed closing commitlock: $!");
1787                 return 0;
1788         }
1789         close($commitlock) || error("failed closing commitlock: $!");
1790         return 1;
1791 }
1792
1793 sub disable_commit_hook () {
1794         open($commitlock, '>', "$config{wikistatedir}/commitlock") ||
1795                 error("cannot write to $config{wikistatedir}/commitlock: $!");
1796         if (! flock($commitlock, 2)) { # LOCK_EX
1797                 error("failed to get commit lock");
1798         }
1799         return 1;
1800 }
1801
1802 sub enable_commit_hook () {
1803         return close($commitlock) if $commitlock;
1804         return;
1805 }
1806
1807 sub loadindex () {
1808         %oldrenderedfiles=%pagectime=();
1809         my $rebuild=$config{rebuild};
1810         if (! $rebuild) {
1811                 %pagesources=%pagemtime=%oldlinks=%links=%depends=
1812                 %destsources=%renderedfiles=%pagecase=%pagestate=
1813                 %depends_simple=%typedlinks=%oldtypedlinks=();
1814         }
1815         my $in;
1816         if (! open ($in, "<", "$config{wikistatedir}/indexdb")) {
1817                 if (-e "$config{wikistatedir}/index") {
1818                         system("ikiwiki-transition", "indexdb", $config{srcdir});
1819                         open ($in, "<", "$config{wikistatedir}/indexdb") || return;
1820                 }
1821                 else {
1822                         # gettime on first build
1823                         $config{gettime}=1 unless defined $config{gettime};
1824                         return;
1825                 }
1826         }
1827
1828         my $index=Storable::fd_retrieve($in);
1829         if (! defined $index) {
1830                 return 0;
1831         }
1832
1833         my $pages;
1834         if (exists $index->{version} && ! ref $index->{version}) {
1835                 $pages=$index->{page};
1836                 %wikistate=%{$index->{state}};
1837                 # Handle plugins that got disabled by loading a new setup.
1838                 if (exists $config{setupfile}) {
1839                         require IkiWiki::Setup;
1840                         IkiWiki::Setup::disabled_plugins(
1841                                 grep { ! $loaded_plugins{$_} } keys %wikistate);
1842                 }
1843         }
1844         else {
1845                 $pages=$index;
1846                 %wikistate=();
1847         }
1848
1849         foreach my $src (keys %$pages) {
1850                 my $d=$pages->{$src};
1851                 my $page;
1852                 if (exists $d->{page} && ! $rebuild) {
1853                         $page=$d->{page};
1854                 }
1855                 else {
1856                         $page=pagename($src);
1857                 }
1858                 $pagectime{$page}=$d->{ctime};
1859                 $pagesources{$page}=$src;
1860                 if (! $rebuild) {
1861                         $pagemtime{$page}=$d->{mtime};
1862                         $renderedfiles{$page}=$d->{dest};
1863                         if (exists $d->{links} && ref $d->{links}) {
1864                                 $links{$page}=$d->{links};
1865                                 $oldlinks{$page}=[@{$d->{links}}];
1866                         }
1867                         if (ref $d->{depends_simple} eq 'ARRAY') {
1868                                 # old format
1869                                 $depends_simple{$page}={
1870                                         map { $_ => 1 } @{$d->{depends_simple}}
1871                                 };
1872                         }
1873                         elsif (exists $d->{depends_simple}) {
1874                                 $depends_simple{$page}=$d->{depends_simple};
1875                         }
1876                         if (exists $d->{dependslist}) {
1877                                 # old format
1878                                 $depends{$page}={
1879                                         map { $_ => $DEPEND_CONTENT }
1880                                                 @{$d->{dependslist}}
1881                                 };
1882                         }
1883                         elsif (exists $d->{depends} && ! ref $d->{depends}) {
1884                                 # old format
1885                                 $depends{$page}={$d->{depends} => $DEPEND_CONTENT };
1886                         }
1887                         elsif (exists $d->{depends}) {
1888                                 $depends{$page}=$d->{depends};
1889                         }
1890                         if (exists $d->{state}) {
1891                                 $pagestate{$page}=$d->{state};
1892                         }
1893                         if (exists $d->{typedlinks}) {
1894                                 $typedlinks{$page}=$d->{typedlinks};
1895
1896                                 while (my ($type, $links) = each %{$typedlinks{$page}}) {
1897                                         next unless %$links;
1898                                         $oldtypedlinks{$page}{$type} = {%$links};
1899                                 }
1900                         }
1901                 }
1902                 $oldrenderedfiles{$page}=[@{$d->{dest}}];
1903         }
1904         foreach my $page (keys %pagesources) {
1905                 $pagecase{lc $page}=$page;
1906         }
1907         foreach my $page (keys %renderedfiles) {
1908                 $destsources{$_}=$page foreach @{$renderedfiles{$page}};
1909         }
1910         $lastrev=$index->{lastrev};
1911         @underlayfiles=@{$index->{underlayfiles}} if ref $index->{underlayfiles};
1912         return close($in);
1913 }
1914
1915 sub saveindex () {
1916         run_hooks(savestate => sub { shift->() });
1917
1918         my @plugins=keys %loaded_plugins;
1919
1920         if (! -d $config{wikistatedir}) {
1921                 mkdir($config{wikistatedir});
1922         }
1923         my $newfile="$config{wikistatedir}/indexdb.new";
1924         my $cleanup = sub { unlink($newfile) };
1925         open (my $out, '>', $newfile) || error("cannot write to $newfile: $!", $cleanup);
1926
1927         my %index;
1928         foreach my $page (keys %pagemtime) {
1929                 next unless $pagemtime{$page};
1930                 my $src=$pagesources{$page};
1931
1932                 $index{page}{$src}={
1933                         page => $page,
1934                         ctime => $pagectime{$page},
1935                         mtime => $pagemtime{$page},
1936                         dest => $renderedfiles{$page},
1937                         links => $links{$page},
1938                 };
1939
1940                 if (exists $depends{$page}) {
1941                         $index{page}{$src}{depends} = $depends{$page};
1942                 }
1943
1944                 if (exists $depends_simple{$page}) {
1945                         $index{page}{$src}{depends_simple} = $depends_simple{$page};
1946                 }
1947
1948                 if (exists $typedlinks{$page} && %{$typedlinks{$page}}) {
1949                         $index{page}{$src}{typedlinks} = $typedlinks{$page};
1950                 }
1951
1952                 if (exists $pagestate{$page}) {
1953                         $index{page}{$src}{state}=$pagestate{$page};
1954                 }
1955         }
1956
1957         $index{state}={};
1958         foreach my $id (@plugins) {
1959                 $index{state}{$id}={}; # used to detect disabled plugins
1960                 foreach my $key (keys %{$wikistate{$id}}) {
1961                         $index{state}{$id}{$key}=$wikistate{$id}{$key};
1962                 }
1963         }
1964
1965         $index{lastrev}=$lastrev;
1966         $index{underlayfiles}=\@underlayfiles;
1967
1968         $index{version}="3";
1969         my $ret=Storable::nstore_fd(\%index, $out);
1970         return if ! defined $ret || ! $ret;
1971         close $out || error("failed saving to $newfile: $!", $cleanup);
1972         rename($newfile, "$config{wikistatedir}/indexdb") ||
1973                 error("failed renaming $newfile to $config{wikistatedir}/indexdb", $cleanup);
1974
1975         return 1;
1976 }
1977
1978 sub template_file ($) {
1979         my $name=shift;
1980
1981         my $tpage=($name =~ s/^\///) ? $name : "templates/$name";
1982         my $template;
1983         if ($name !~ /\.tmpl$/ && exists $pagesources{$tpage}) {
1984                 $template=srcfile($pagesources{$tpage}, 1);
1985                 $name.=".tmpl";
1986         }
1987         else {
1988                 $template=srcfile($tpage, 1);
1989         }
1990
1991         if (defined $template) {
1992                 return $template, $tpage, 1 if wantarray;
1993                 return $template;
1994         }
1995         else {
1996                 $name=~s:/::; # avoid path traversal
1997                 foreach my $dir ($config{templatedir},
1998                                  "$installdir/share/ikiwiki/templates") {
1999                         if (-e "$dir/$name") {
2000                                 $template="$dir/$name";
2001                                 last;
2002                         }
2003                 }
2004                 if (defined $template) {
2005                         return $template, $tpage if wantarray;
2006                         return $template;
2007                 }
2008         }
2009
2010         return;
2011 }
2012
2013 sub template_depends ($$;@) {
2014         my $name=shift;
2015         my $page=shift;
2016
2017         my ($filename, $tpage, $untrusted)=template_file($name);
2018         if (! defined $filename) {
2019                 error(sprintf(gettext("template %s not found"), $name))
2020         }
2021
2022         if (defined $page && defined $tpage) {
2023                 add_depends($page, $tpage);
2024         }
2025
2026         my @opts=(
2027                 filter => sub {
2028                         my $text_ref = shift;
2029                         ${$text_ref} = decode_utf8(${$text_ref});
2030                 },
2031                 loop_context_vars => 1,
2032                 die_on_bad_params => 0,
2033                 parent_global_vars => 1,
2034                 filename => $filename,
2035                 @_,
2036                 ($untrusted ? (no_includes => 1) : ()),
2037         );
2038         return @opts if wantarray;
2039
2040         require HTML::Template;
2041         return HTML::Template->new(@opts);
2042 }
2043
2044 sub template ($;@) {
2045         template_depends(shift, undef, @_);
2046 }
2047
2048 sub templateactions ($$) {
2049         my $template=shift;
2050         my $page=shift;
2051
2052         my $have_actions=0;
2053         my @actions;
2054         run_hooks(pageactions => sub {
2055                 push @actions, map { { action => $_ } }
2056                         grep { defined } shift->(page => $page);
2057         });
2058         $template->param(actions => \@actions);
2059
2060         if ($config{cgiurl} && exists $hooks{auth}) {
2061                 $template->param(prefsurl => cgiurl(do => "prefs"));
2062                 $have_actions=1;
2063         }
2064
2065         if ($have_actions || @actions) {
2066                 $template->param(have_actions => 1);
2067         }
2068 }
2069
2070 sub hook (@) {
2071         my %param=@_;
2072
2073         if (! exists $param{type} || ! ref $param{call} || ! exists $param{id}) {
2074                 error 'hook requires type, call, and id parameters';
2075         }
2076
2077         return if $param{no_override} && exists $hooks{$param{type}}{$param{id}};
2078
2079         $hooks{$param{type}}{$param{id}}=\%param;
2080         return 1;
2081 }
2082
2083 sub run_hooks ($$) {
2084         # Calls the given sub for each hook of the given type,
2085         # passing it the hook function to call.
2086         my $type=shift;
2087         my $sub=shift;
2088
2089         if (exists $hooks{$type}) {
2090                 my (@first, @middle, @last);
2091                 foreach my $id (keys %{$hooks{$type}}) {
2092                         if ($hooks{$type}{$id}{first}) {
2093                                 push @first, $id;
2094                         }
2095                         elsif ($hooks{$type}{$id}{last}) {
2096                                 push @last, $id;
2097                         }
2098                         else {
2099                                 push @middle, $id;
2100                         }
2101                 }
2102                 foreach my $id (@first, @middle, @last) {
2103                         $sub->($hooks{$type}{$id}{call});
2104                 }
2105         }
2106
2107         return 1;
2108 }
2109
2110 sub rcs_update () {
2111         $hooks{rcs}{rcs_update}{call}->(@_);
2112 }
2113
2114 sub rcs_prepedit ($) {
2115         $hooks{rcs}{rcs_prepedit}{call}->(@_);
2116 }
2117
2118 sub rcs_commit (@) {
2119         $hooks{rcs}{rcs_commit}{call}->(@_);
2120 }
2121
2122 sub rcs_commit_staged (@) {
2123         $hooks{rcs}{rcs_commit_staged}{call}->(@_);
2124 }
2125
2126 sub rcs_add ($) {
2127         $hooks{rcs}{rcs_add}{call}->(@_);
2128 }
2129
2130 sub rcs_remove ($) {
2131         $hooks{rcs}{rcs_remove}{call}->(@_);
2132 }
2133
2134 sub rcs_rename ($$) {
2135         $hooks{rcs}{rcs_rename}{call}->(@_);
2136 }
2137
2138 sub rcs_recentchanges ($) {
2139         $hooks{rcs}{rcs_recentchanges}{call}->(@_);
2140 }
2141
2142 sub rcs_diff ($;$) {
2143         $hooks{rcs}{rcs_diff}{call}->(@_);
2144 }
2145
2146 sub rcs_getctime ($) {
2147         $hooks{rcs}{rcs_getctime}{call}->(@_);
2148 }
2149
2150 sub rcs_getmtime ($) {
2151         $hooks{rcs}{rcs_getmtime}{call}->(@_);
2152 }
2153
2154 sub rcs_receive () {
2155         $hooks{rcs}{rcs_receive}{call}->();
2156 }
2157
2158 sub add_depends ($$;$) {
2159         my $page=shift;
2160         my $pagespec=shift;
2161         my $deptype=shift || $DEPEND_CONTENT;
2162
2163         # Is the pagespec a simple page name?
2164         if ($pagespec =~ /$config{wiki_file_regexp}/ &&
2165             $pagespec !~ /[\s*?()!]/) {
2166                 $depends_simple{$page}{lc $pagespec} |= $deptype;
2167                 return 1;
2168         }
2169
2170         # Add explicit dependencies for influences.
2171         my $sub=pagespec_translate($pagespec);
2172         return unless defined $sub;
2173         foreach my $p (keys %pagesources) {
2174                 my $r=$sub->($p, location => $page);
2175                 my $i=$r->influences;
2176                 my $static=$r->influences_static;
2177                 foreach my $k (keys %$i) {
2178                         next unless $r || $static || $k eq $page;
2179                         $depends_simple{$page}{lc $k} |= $i->{$k};
2180                 }
2181                 last if $static;
2182         }
2183
2184         $depends{$page}{$pagespec} |= $deptype;
2185         return 1;
2186 }
2187
2188 sub deptype (@) {
2189         my $deptype=0;
2190         foreach my $type (@_) {
2191                 if ($type eq 'presence') {
2192                         $deptype |= $DEPEND_PRESENCE;
2193                 }
2194                 elsif ($type eq 'links') {
2195                         $deptype |= $DEPEND_LINKS;
2196                 }
2197                 elsif ($type eq 'content') {
2198                         $deptype |= $DEPEND_CONTENT;
2199                 }
2200         }
2201         return $deptype;
2202 }
2203
2204 my $file_prune_regexp;
2205 sub file_pruned ($) {
2206         my $file=shift;
2207
2208         if (defined $config{include} && length $config{include}) {
2209                 return 0 if $file =~ m/$config{include}/;
2210         }
2211
2212         if (! defined $file_prune_regexp) {
2213                 $file_prune_regexp='('.join('|', @{$config{wiki_file_prune_regexps}}).')';
2214                 $file_prune_regexp=qr/$file_prune_regexp/;
2215         }
2216         return $file =~ m/$file_prune_regexp/;
2217 }
2218
2219 sub define_gettext () {
2220         # If translation is needed, redefine the gettext function to do it.
2221         # Otherwise, it becomes a quick no-op.
2222         my $gettext_obj;
2223         my $getobj;
2224         if ((exists $ENV{LANG} && length $ENV{LANG}) ||
2225             (exists $ENV{LC_ALL} && length $ENV{LC_ALL}) ||
2226             (exists $ENV{LC_MESSAGES} && length $ENV{LC_MESSAGES})) {
2227                 $getobj=sub {
2228                         $gettext_obj=eval q{
2229                                 use Locale::gettext q{textdomain};
2230                                 Locale::gettext->domain('ikiwiki')
2231                         };
2232                 };
2233         }
2234
2235         no warnings 'redefine';
2236         *gettext=sub {
2237                 $getobj->() if $getobj;
2238                 if ($gettext_obj) {
2239                         $gettext_obj->get(shift);
2240                 }
2241                 else {
2242                         return shift;
2243                 }
2244         };
2245         *ngettext=sub {
2246                 $getobj->() if $getobj;
2247                 if ($gettext_obj) {
2248                         $gettext_obj->nget(@_);
2249                 }
2250                 else {
2251                         return ($_[2] == 1 ? $_[0] : $_[1])
2252                 }
2253         };
2254 }
2255
2256 sub gettext {
2257         define_gettext();
2258         gettext(@_);
2259 }
2260
2261 sub ngettext {
2262         define_gettext();
2263         ngettext(@_);
2264 }
2265
2266 sub yesno ($) {
2267         my $val=shift;
2268
2269         return (defined $val && (lc($val) eq gettext("yes") || lc($val) eq "yes" || $val eq "1"));
2270 }
2271
2272 sub inject {
2273         # Injects a new function into the symbol table to replace an
2274         # exported function.
2275         my %params=@_;
2276
2277         # This is deep ugly perl foo, beware.
2278         no strict;
2279         no warnings;
2280         if (! defined $params{parent}) {
2281                 $params{parent}='::';
2282                 $params{old}=\&{$params{name}};
2283                 $params{name}=~s/.*:://;
2284         }
2285         my $parent=$params{parent};
2286         foreach my $ns (grep /^\w+::/, keys %{$parent}) {
2287                 $ns = $params{parent} . $ns;
2288                 inject(%params, parent => $ns) unless $ns eq '::main::';
2289                 *{$ns . $params{name}} = $params{call}
2290                         if exists ${$ns}{$params{name}} &&
2291                            \&{${$ns}{$params{name}}} == $params{old};
2292         }
2293         use strict;
2294         use warnings;
2295 }
2296
2297 sub add_link ($$;$) {
2298         my $page=shift;
2299         my $link=shift;
2300         my $type=shift;
2301
2302         push @{$links{$page}}, $link
2303                 unless grep { $_ eq $link } @{$links{$page}};
2304
2305         if (defined $type) {
2306                 $typedlinks{$page}{$type}{$link} = 1;
2307         }
2308 }
2309
2310 sub add_autofile ($$$) {
2311         my $file=shift;
2312         my $plugin=shift;
2313         my $generator=shift;
2314
2315         $autofiles{$file}{plugin}=$plugin;
2316         $autofiles{$file}{generator}=$generator;
2317 }
2318
2319 sub useragent () {
2320         return LWP::UserAgent->new(
2321                 cookie_jar => $config{cookiejar},
2322                 env_proxy => 1,         # respect proxy env vars
2323                 agent => $config{useragent},
2324         );
2325 }
2326
2327 sub sortspec_translate ($$) {
2328         my $spec = shift;
2329         my $reverse = shift;
2330
2331         my $code = "";
2332         my @data;
2333         while ($spec =~ m{
2334                 \s*
2335                 (-?)            # group 1: perhaps negated
2336                 \s*
2337                 (               # group 2: a word
2338                         \w+\([^\)]*\)   # command(params)
2339                         |
2340                         [^\s]+          # or anything else
2341                 )
2342                 \s*
2343         }gx) {
2344                 my $negated = $1;
2345                 my $word = $2;
2346                 my $params = undef;
2347
2348                 if ($word =~ m/^(\w+)\((.*)\)$/) {
2349                         # command with parameters
2350                         $params = $2;
2351                         $word = $1;
2352                 }
2353                 elsif ($word !~ m/^\w+$/) {
2354                         error(sprintf(gettext("invalid sort type %s"), $word));
2355                 }
2356
2357                 if (length $code) {
2358                         $code .= " || ";
2359                 }
2360
2361                 if ($negated) {
2362                         $code .= "-";
2363                 }
2364
2365                 if (exists $IkiWiki::SortSpec::{"cmp_$word"}) {
2366                         if (defined $params) {
2367                                 push @data, $params;
2368                                 $code .= "IkiWiki::SortSpec::cmp_$word(\$data[$#data])";
2369                         }
2370                         else {
2371                                 $code .= "IkiWiki::SortSpec::cmp_$word(undef)";
2372                         }
2373                 }
2374                 else {
2375                         error(sprintf(gettext("unknown sort type %s"), $word));
2376                 }
2377         }
2378
2379         if (! length $code) {
2380                 # undefined sorting method... sort arbitrarily
2381                 return sub { 0 };
2382         }
2383
2384         if ($reverse) {
2385                 $code="-($code)";
2386         }
2387
2388         no warnings;
2389         return eval 'sub { '.$code.' }';
2390 }
2391
2392 sub pagespec_translate ($) {
2393         my $spec=shift;
2394
2395         # Convert spec to perl code.
2396         my $code="";
2397         my @data;
2398         while ($spec=~m{
2399                 \s*             # ignore whitespace
2400                 (               # 1: match a single word
2401                         \!              # !
2402                 |
2403                         \(              # (
2404                 |
2405                         \)              # )
2406                 |
2407                         \w+\([^\)]*\)   # command(params)
2408                 |
2409                         [^\s()]+        # any other text
2410                 )
2411                 \s*             # ignore whitespace
2412         }gx) {
2413                 my $word=$1;
2414                 if (lc $word eq 'and') {
2415                         $code.=' &';
2416                 }
2417                 elsif (lc $word eq 'or') {
2418                         $code.=' |';
2419                 }
2420                 elsif ($word eq "(" || $word eq ")" || $word eq "!") {
2421                         $code.=' '.$word;
2422                 }
2423                 elsif ($word =~ /^(\w+)\((.*)\)$/) {
2424                         if (exists $IkiWiki::PageSpec::{"match_$1"}) {
2425                                 push @data, $2;
2426                                 $code.="IkiWiki::PageSpec::match_$1(\$page, \$data[$#data], \@_)";
2427                         }
2428                         else {
2429                                 push @data, qq{unknown function in pagespec "$word"};
2430                                 $code.="IkiWiki::ErrorReason->new(\$data[$#data])";
2431                         }
2432                 }
2433                 else {
2434                         push @data, $word;
2435                         $code.=" IkiWiki::PageSpec::match_glob(\$page, \$data[$#data], \@_)";
2436                 }
2437         }
2438
2439         if (! length $code) {
2440                 $code="IkiWiki::FailReason->new('empty pagespec')";
2441         }
2442
2443         no warnings;
2444         return eval 'sub { my $page=shift; '.$code.' }';
2445 }
2446
2447 sub pagespec_match ($$;@) {
2448         my $page=shift;
2449         my $spec=shift;
2450         my @params=@_;
2451
2452         # Backwards compatability with old calling convention.
2453         if (@params == 1) {
2454                 unshift @params, 'location';
2455         }
2456
2457         my $sub=pagespec_translate($spec);
2458         return IkiWiki::ErrorReason->new("syntax error in pagespec \"$spec\"")
2459                 if ! defined $sub;
2460         return $sub->($page, @params);
2461 }
2462
2463 sub pagespec_match_list ($$;@) {
2464         my $page=shift;
2465         my $pagespec=shift;
2466         my %params=@_;
2467
2468         # Backwards compatability with old calling convention.
2469         if (ref $page) {
2470                 print STDERR "warning: a plugin (".caller().") is using pagespec_match_list in an obsolete way, and needs to be updated\n";
2471                 $params{list}=$page;
2472                 $page=$params{location}; # ugh!
2473         }
2474
2475         my $sub=pagespec_translate($pagespec);
2476         error "syntax error in pagespec \"$pagespec\""
2477                 if ! defined $sub;
2478         my $sort=sortspec_translate($params{sort}, $params{reverse})
2479                 if defined $params{sort};
2480
2481         my @candidates;
2482         if (exists $params{list}) {
2483                 @candidates=exists $params{filter}
2484                         ? grep { ! $params{filter}->($_) } @{$params{list}}
2485                         : @{$params{list}};
2486         }
2487         else {
2488                 @candidates=exists $params{filter}
2489                         ? grep { ! $params{filter}->($_) } keys %pagesources
2490                         : keys %pagesources;
2491         }
2492
2493         # clear params, remainder is passed to pagespec
2494         $depends{$page}{$pagespec} |= ($params{deptype} || $DEPEND_CONTENT);
2495         my $num=$params{num};
2496         delete @params{qw{num deptype reverse sort filter list}};
2497
2498         # when only the top matches will be returned, it's efficient to
2499         # sort before matching to pagespec,
2500         if (defined $num && defined $sort) {
2501                 @candidates=IkiWiki::SortSpec::sort_pages(
2502                         $sort, @candidates);
2503         }
2504
2505         my @matches;
2506         my $firstfail;
2507         my $count=0;
2508         my $accum=IkiWiki::SuccessReason->new();
2509         foreach my $p (@candidates) {
2510                 my $r=$sub->($p, %params, location => $page);
2511                 error(sprintf(gettext("cannot match pages: %s"), $r))
2512                         if $r->isa("IkiWiki::ErrorReason");
2513                 unless ($r || $r->influences_static) {
2514                         $r->remove_influence($p);
2515                 }
2516                 $accum |= $r;
2517                 if ($r) {
2518                         push @matches, $p;
2519                         last if defined $num && ++$count == $num;
2520                 }
2521         }
2522
2523         # Add simple dependencies for accumulated influences.
2524         my $i=$accum->influences;
2525         foreach my $k (keys %$i) {
2526                 $depends_simple{$page}{lc $k} |= $i->{$k};
2527         }
2528
2529         # when all matches will be returned, it's efficient to
2530         # sort after matching
2531         if (! defined $num && defined $sort) {
2532                 return IkiWiki::SortSpec::sort_pages(
2533                         $sort, @matches);
2534         }
2535         else {
2536                 return @matches;
2537         }
2538 }
2539
2540 sub pagespec_valid ($) {
2541         my $spec=shift;
2542
2543         return defined pagespec_translate($spec);
2544 }
2545
2546 sub glob2re ($) {
2547         my $re=quotemeta(shift);
2548         $re=~s/\\\*/.*/g;
2549         $re=~s/\\\?/./g;
2550         return qr/^$re$/i;
2551 }
2552
2553 package IkiWiki::FailReason;
2554
2555 use overload (
2556         '""'    => sub { $_[0][0] },
2557         '0+'    => sub { 0 },
2558         '!'     => sub { bless $_[0], 'IkiWiki::SuccessReason'},
2559         '&'     => sub { $_[0]->merge_influences($_[1], 1); $_[0] },
2560         '|'     => sub { $_[1]->merge_influences($_[0]); $_[1] },
2561         fallback => 1,
2562 );
2563
2564 our @ISA = 'IkiWiki::SuccessReason';
2565
2566 package IkiWiki::SuccessReason;
2567
2568 use overload (
2569         '""'    => sub { $_[0][0] },
2570         '0+'    => sub { 1 },
2571         '!'     => sub { bless $_[0], 'IkiWiki::FailReason'},
2572         '&'     => sub { $_[1]->merge_influences($_[0], 1); $_[1] },
2573         '|'     => sub { $_[0]->merge_influences($_[1]); $_[0] },
2574         fallback => 1,
2575 );
2576
2577 sub new {
2578         my $class = shift;
2579         my $value = shift;
2580         return bless [$value, {@_}], $class;
2581 }
2582
2583 sub influences {
2584         my $this=shift;
2585         $this->[1]={@_} if @_;
2586         my %i=%{$this->[1]};
2587         delete $i{""};
2588         return \%i;
2589 }
2590
2591 sub influences_static {
2592         return ! $_[0][1]->{""};
2593 }
2594
2595 sub merge_influences {
2596         my $this=shift;
2597         my $other=shift;
2598         my $anded=shift;
2599
2600         if (! $anded || (($this || %{$this->[1]}) &&
2601                          ($other || %{$other->[1]}))) {
2602                 foreach my $influence (keys %{$other->[1]}) {
2603                         $this->[1]{$influence} |= $other->[1]{$influence};
2604                 }
2605         }
2606         else {
2607                 # influence blocker
2608                 $this->[1]={};
2609         }
2610 }
2611
2612 sub remove_influence {
2613         my $this=shift;
2614         my $torm=shift;
2615
2616         delete $this->[1]{$torm};
2617 }
2618
2619 package IkiWiki::ErrorReason;
2620
2621 our @ISA = 'IkiWiki::FailReason';
2622
2623 package IkiWiki::PageSpec;
2624
2625 sub derel ($$) {
2626         my $path=shift;
2627         my $from=shift;
2628
2629         if ($path =~ m!^\.(/|$)!) {
2630                 if ($1) {
2631                         $from=~s#/?[^/]+$## if defined $from;
2632                         $path=~s#^\./##;
2633                         $path="$from/$path" if defined $from && length $from;
2634                 }
2635                 else {
2636                         $path = $from;
2637                         $path = "" unless defined $path;
2638                 }
2639         }
2640
2641         return $path;
2642 }
2643
2644 my %glob_cache;
2645
2646 sub match_glob ($$;@) {
2647         my $page=shift;
2648         my $glob=shift;
2649         my %params=@_;
2650
2651         $glob=derel($glob, $params{location});
2652
2653         # Instead of converting the glob to a regex every time,
2654         # cache the compiled regex to save time.
2655         my $re=$glob_cache{$glob};
2656         unless (defined $re) {
2657                 $glob_cache{$glob} = $re = IkiWiki::glob2re($glob);
2658         }
2659         if ($page =~ $re) {
2660                 if (! IkiWiki::isinternal($page) || $params{internal}) {
2661                         return IkiWiki::SuccessReason->new("$glob matches $page");
2662                 }
2663                 else {
2664                         return IkiWiki::FailReason->new("$glob matches $page, but the page is an internal page");
2665                 }
2666         }
2667         else {
2668                 return IkiWiki::FailReason->new("$glob does not match $page");
2669         }
2670 }
2671
2672 sub match_internal ($$;@) {
2673         return match_glob(shift, shift, @_, internal => 1)
2674 }
2675
2676 sub match_page ($$;@) {
2677         my $page=shift;
2678         my $match=match_glob($page, shift, @_);
2679         if ($match) {
2680                 my $source=exists $IkiWiki::pagesources{$page} ?
2681                         $IkiWiki::pagesources{$page} :
2682                         $IkiWiki::delpagesources{$page};
2683                 my $type=defined $source ? IkiWiki::pagetype($source) : undef;
2684                 if (! defined $type) {
2685                         return IkiWiki::FailReason->new("$page is not a page");
2686                 }
2687         }
2688         return $match;
2689 }
2690
2691 sub match_link ($$;@) {
2692         my $page=shift;
2693         my $link=lc(shift);
2694         my %params=@_;
2695
2696         $link=derel($link, $params{location});
2697         my $from=exists $params{location} ? $params{location} : '';
2698         my $linktype=$params{linktype};
2699         my $qualifier='';
2700         if (defined $linktype) {
2701                 $qualifier=" with type $linktype";
2702         }
2703
2704         my $links = $IkiWiki::links{$page};
2705         return IkiWiki::FailReason->new("$page has no links", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2706                 unless $links && @{$links};
2707         my $bestlink = IkiWiki::bestlink($from, $link);
2708         foreach my $p (@{$links}) {
2709                 next unless (! defined $linktype || exists $IkiWiki::typedlinks{$page}{$linktype}{$p});
2710
2711                 if (length $bestlink) {
2712                         if ($bestlink eq IkiWiki::bestlink($page, $p)) {
2713                                 return IkiWiki::SuccessReason->new("$page links to $link$qualifier", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2714                         }
2715                 }
2716                 else {
2717                         if (match_glob($p, $link, %params)) {
2718                                 return IkiWiki::SuccessReason->new("$page links to page $p$qualifier, matching $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2719                         }
2720                         my ($p_rel)=$p=~/^\/?(.*)/;
2721                         $link=~s/^\///;
2722                         if (match_glob($p_rel, $link, %params)) {
2723                                 return IkiWiki::SuccessReason->new("$page links to page $p_rel$qualifier, matching $link", $page => $IkiWiki::DEPEND_LINKS, "" => 1)
2724                         }
2725                 }
2726         }
2727         return IkiWiki::FailReason->new("$page does not link to $link$qualifier", $page => $IkiWiki::DEPEND_LINKS, "" => 1);
2728 }
2729
2730 sub match_backlink ($$;@) {
2731         my $page=shift;
2732         my $testpage=shift;
2733         my %params=@_;
2734         if ($testpage eq '.') {
2735                 $testpage = $params{'location'}
2736         }
2737         my $ret=match_link($testpage, $page, @_);
2738         $ret->influences($testpage => $IkiWiki::DEPEND_LINKS);
2739         return $ret;
2740 }
2741
2742 sub match_created_before ($$;@) {
2743         my $page=shift;
2744         my $testpage=shift;
2745         my %params=@_;
2746
2747         $testpage=derel($testpage, $params{location});
2748
2749         if (exists $IkiWiki::pagectime{$testpage}) {
2750                 if ($IkiWiki::pagectime{$page} < $IkiWiki::pagectime{$testpage}) {
2751                         return IkiWiki::SuccessReason->new("$page created before $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2752                 }
2753                 else {
2754                         return IkiWiki::FailReason->new("$page not created before $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2755                 }
2756         }
2757         else {
2758                 return IkiWiki::ErrorReason->new("$testpage does not exist", $testpage => $IkiWiki::DEPEND_PRESENCE);
2759         }
2760 }
2761
2762 sub match_created_after ($$;@) {
2763         my $page=shift;
2764         my $testpage=shift;
2765         my %params=@_;
2766
2767         $testpage=derel($testpage, $params{location});
2768
2769         if (exists $IkiWiki::pagectime{$testpage}) {
2770                 if ($IkiWiki::pagectime{$page} > $IkiWiki::pagectime{$testpage}) {
2771                         return IkiWiki::SuccessReason->new("$page created after $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2772                 }
2773                 else {
2774                         return IkiWiki::FailReason->new("$page not created after $testpage", $testpage => $IkiWiki::DEPEND_PRESENCE);
2775                 }
2776         }
2777         else {
2778                 return IkiWiki::ErrorReason->new("$testpage does not exist", $testpage => $IkiWiki::DEPEND_PRESENCE);
2779         }
2780 }
2781
2782 sub match_creation_day ($$;@) {
2783         my $page=shift;
2784         my $d=shift;
2785         if ($d !~ /^\d+$/) {
2786                 return IkiWiki::ErrorReason->new("invalid day $d");
2787         }
2788         if ((localtime($IkiWiki::pagectime{$page}))[3] == $d) {
2789                 return IkiWiki::SuccessReason->new('creation_day matched');
2790         }
2791         else {
2792                 return IkiWiki::FailReason->new('creation_day did not match');
2793         }
2794 }
2795
2796 sub match_creation_month ($$;@) {
2797         my $page=shift;
2798         my $m=shift;
2799         if ($m !~ /^\d+$/) {
2800                 return IkiWiki::ErrorReason->new("invalid month $m");
2801         }
2802         if ((localtime($IkiWiki::pagectime{$page}))[4] + 1 == $m) {
2803                 return IkiWiki::SuccessReason->new('creation_month matched');
2804         }
2805         else {
2806                 return IkiWiki::FailReason->new('creation_month did not match');
2807         }
2808 }
2809
2810 sub match_creation_year ($$;@) {
2811         my $page=shift;
2812         my $y=shift;
2813         if ($y !~ /^\d+$/) {
2814                 return IkiWiki::ErrorReason->new("invalid year $y");
2815         }
2816         if ((localtime($IkiWiki::pagectime{$page}))[5] + 1900 == $y) {
2817                 return IkiWiki::SuccessReason->new('creation_year matched');
2818         }
2819         else {
2820                 return IkiWiki::FailReason->new('creation_year did not match');
2821         }
2822 }
2823
2824 sub match_user ($$;@) {
2825         shift;
2826         my $user=shift;
2827         my %params=@_;
2828
2829         if (! exists $params{user}) {
2830                 return IkiWiki::ErrorReason->new("no user specified");
2831         }
2832
2833         my $regexp=IkiWiki::glob2re($user);
2834
2835         if (defined $params{user} && $params{user}=~$regexp) {
2836                 return IkiWiki::SuccessReason->new("user is $user");
2837         }
2838         elsif (! defined $params{user}) {
2839                 return IkiWiki::FailReason->new("not logged in");
2840         }
2841         else {
2842                 return IkiWiki::FailReason->new("user is $params{user}, not $user");
2843         }
2844 }
2845
2846 sub match_admin ($$;@) {
2847         shift;
2848         shift;
2849         my %params=@_;
2850
2851         if (! exists $params{user}) {
2852                 return IkiWiki::ErrorReason->new("no user specified");
2853         }
2854
2855         if (defined $params{user} && IkiWiki::is_admin($params{user})) {
2856                 return IkiWiki::SuccessReason->new("user is an admin");
2857         }
2858         elsif (! defined $params{user}) {
2859                 return IkiWiki::FailReason->new("not logged in");
2860         }
2861         else {
2862                 return IkiWiki::FailReason->new("user is not an admin");
2863         }
2864 }
2865
2866 sub match_ip ($$;@) {
2867         shift;
2868         my $ip=shift;
2869         my %params=@_;
2870
2871         if (! exists $params{ip}) {
2872                 return IkiWiki::ErrorReason->new("no IP specified");
2873         }
2874
2875         my $regexp=IkiWiki::glob2re(lc $ip);
2876
2877         if (defined $params{ip} && lc $params{ip}=~$regexp) {
2878                 return IkiWiki::SuccessReason->new("IP is $ip");
2879         }
2880         else {
2881                 return IkiWiki::FailReason->new("IP is $params{ip}, not $ip");
2882         }
2883 }
2884
2885 package IkiWiki::SortSpec;
2886
2887 # This is in the SortSpec namespace so that the $a and $b that sort() uses
2888 # are easily available in this namespace, for cmp functions to use them.
2889 sub sort_pages {
2890         my $f=shift;
2891         sort $f @_
2892 }
2893
2894 sub cmp_title {
2895         IkiWiki::pagetitle(IkiWiki::basename($a))
2896         cmp
2897         IkiWiki::pagetitle(IkiWiki::basename($b))
2898 }
2899
2900 sub cmp_path { IkiWiki::pagetitle($a) cmp IkiWiki::pagetitle($b) }
2901 sub cmp_mtime { $IkiWiki::pagemtime{$b} <=> $IkiWiki::pagemtime{$a} }
2902 sub cmp_age { $IkiWiki::pagectime{$b} <=> $IkiWiki::pagectime{$a} }
2903
2904 1