IkiWiki.pm

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