]> git.vanrenterghem.biz Git - git.ikiwiki.info.git/blobdiff - IkiWiki.pm
Merge branch 'master' into dependency-types
[git.ikiwiki.info.git] / IkiWiki.pm
index 703b596a8b9168c40e9e5abdb5c30f1bd9b6133c..7b1d24c6a2214d14543aadcbbadde9767a15af52 100644 (file)
 #!/usr/bin/perl
 
 package IkiWiki;
 #!/usr/bin/perl
 
 package IkiWiki;
+
 use warnings;
 use strict;
 use Encode;
 use HTML::Entities;
 use warnings;
 use strict;
 use Encode;
 use HTML::Entities;
+use URI::Escape q{uri_escape_utf8};
+use POSIX;
+use Storable;
 use open qw{:utf8 :std};
 
 use open qw{:utf8 :std};
 
-use vars qw{%config %links %oldlinks %oldpagemtime %pagectime %pagecase
-            %renderedfiles %oldrenderedfiles %pagesources %depends %hooks
-           %forcerebuild};
+use vars qw{%config %links %oldlinks %pagemtime %pagectime %pagecase
+           %pagestate %wikistate %renderedfiles %oldrenderedfiles
+           %pagesources %destsources %depends %depends_simple %hooks
+           %forcerebuild %loaded_plugins};
 
 use Exporter q{import};
 our @EXPORT = qw(hook debug error template htmlpage add_depends pagespec_match
 
 use Exporter q{import};
 our @EXPORT = qw(hook debug error template htmlpage add_depends pagespec_match
-                 bestlink htmllink readfile writefile pagetype srcfile pagename
-                 displaytime will_render
-                 %config %links %renderedfiles %pagesources);
-our $VERSION = 1.01; # plugin interface version
+                 pagespec_match_list bestlink htmllink readfile writefile
+                pagetype srcfile pagename displaytime will_render gettext urlto
+                targetpage add_underlay pagetitle titlepage linkpage
+                newpagefile inject add_link
+                 %config %links %pagestate %wikistate %renderedfiles
+                 %pagesources %destsources);
+our $VERSION = 3.00; # plugin interface version, next is ikiwiki version
+our $version='unknown'; # VERSION_AUTOREPLACE done by Makefile, DNE
+our $installdir='/usr'; # INSTALLDIR_AUTOREPLACE done by Makefile, DNE
+
+# Page dependency types.
+our $DEPEND_CONTENT=1;
+our $DEPEND_PRESENCE=2;
+our $DEPEND_LINKS=4;
 
 # Optimisation.
 use Memoize;
 memoize("abs2rel");
 memoize("pagespec_translate");
 
 # Optimisation.
 use Memoize;
 memoize("abs2rel");
 memoize("pagespec_translate");
+memoize("file_pruned");
+memoize("template_file");
+
+sub getsetup () {
+       wikiname => {
+               type => "string",
+               default => "wiki",
+               description => "name of the wiki",
+               safe => 1,
+               rebuild => 1,
+       },
+       adminemail => {
+               type => "string",
+               default => undef,
+               example => 'me@example.com',
+               description => "contact email for wiki",
+               safe => 1,
+               rebuild => 0,
+       },
+       adminuser => {
+               type => "string",
+               default => [],
+               description => "users who are wiki admins",
+               safe => 1,
+               rebuild => 0,
+       },
+       banned_users => {
+               type => "string",
+               default => [],
+               description => "users who are banned from the wiki",
+               safe => 1,
+               rebuild => 0,
+       },
+       srcdir => {
+               type => "string",
+               default => undef,
+               example => "$ENV{HOME}/wiki",
+               description => "where the source of the wiki is located",
+               safe => 0, # path
+               rebuild => 1,
+       },
+       destdir => {
+               type => "string",
+               default => undef,
+               example => "/var/www/wiki",
+               description => "where to build the wiki",
+               safe => 0, # path
+               rebuild => 1,
+       },
+       url => {
+               type => "string",
+               default => '',
+               example => "http://example.com/wiki",
+               description => "base url to the wiki",
+               safe => 1,
+               rebuild => 1,
+       },
+       cgiurl => {
+               type => "string",
+               default => '',
+               example => "http://example.com/wiki/ikiwiki.cgi",
+               description => "url to the ikiwiki.cgi",
+               safe => 1,
+               rebuild => 1,
+       },
+       cgi_wrapper => {
+               type => "string",
+               default => '',
+               example => "/var/www/wiki/ikiwiki.cgi",
+               description => "filename of cgi wrapper to generate",
+               safe => 0, # file
+               rebuild => 0,
+       },
+       cgi_wrappermode => {
+               type => "string",
+               default => '06755',
+               description => "mode for cgi_wrapper (can safely be made suid)",
+               safe => 0,
+               rebuild => 0,
+       },
+       rcs => {
+               type => "string",
+               default => '',
+               description => "rcs backend to use",
+               safe => 0, # don't allow overriding
+               rebuild => 0,
+       },
+       default_plugins => {
+               type => "internal",
+               default => [qw{mdwn link inline meta htmlscrubber passwordauth
+                               openid signinedit lockedit conditional
+                               recentchanges parentlinks editpage}],
+               description => "plugins to enable by default",
+               safe => 0,
+               rebuild => 1,
+       },
+       add_plugins => {
+               type => "string",
+               default => [],
+               description => "plugins to add to the default configuration",
+               safe => 1,
+               rebuild => 1,
+       },
+       disable_plugins => {
+               type => "string",
+               default => [],
+               description => "plugins to disable",
+               safe => 1,
+               rebuild => 1,
+       },
+       templatedir => {
+               type => "string",
+               default => "$installdir/share/ikiwiki/templates",
+               description => "location of template files",
+               advanced => 1,
+               safe => 0, # path
+               rebuild => 1,
+       },
+       templatedirs => {
+               type => "internal",
+               default => [],
+               description => "additional directories containing template files",
+               safe => 0,
+               rebuild => 0,
+       },
+       underlaydir => {
+               type => "string",
+               default => "$installdir/share/ikiwiki/basewiki",
+               description => "base wiki source location",
+               advanced => 1,
+               safe => 0, # path
+               rebuild => 0,
+       },
+       underlaydirbase => {
+               type => "internal",
+               default => "$installdir/share/ikiwiki",
+               description => "parent directory containing additional underlays",
+               safe => 0,
+               rebuild => 0,
+       },
+       wrappers => {
+               type => "internal",
+               default => [],
+               description => "wrappers to generate",
+               safe => 0,
+               rebuild => 0,
+       },
+       underlaydirs => {
+               type => "internal",
+               default => [],
+               description => "additional underlays to use",
+               safe => 0,
+               rebuild => 0,
+       },
+       verbose => {
+               type => "boolean",
+               example => 1,
+               description => "display verbose messages?",
+               safe => 1,
+               rebuild => 0,
+       },
+       syslog => {
+               type => "boolean",
+               example => 1,
+               description => "log to syslog?",
+               safe => 1,
+               rebuild => 0,
+       },
+       usedirs => {
+               type => "boolean",
+               default => 1,
+               description => "create output files named page/index.html?",
+               safe => 0, # changing requires manual transition
+               rebuild => 1,
+       },
+       prefix_directives => {
+               type => "boolean",
+               default => 1,
+               description => "use '!'-prefixed preprocessor directives?",
+               safe => 0, # changing requires manual transition
+               rebuild => 1,
+       },
+       indexpages => {
+               type => "boolean",
+               default => 0,
+               description => "use page/index.mdwn source files",
+               safe => 1,
+               rebuild => 1,
+       },
+       discussion => {
+               type => "boolean",
+               default => 1,
+               description => "enable Discussion pages?",
+               safe => 1,
+               rebuild => 1,
+       },
+       discussionpage => {
+               type => "string",
+               default => gettext("Discussion"),
+               description => "name of Discussion pages",
+               safe => 1,
+               rebuild => 1,
+       },
+       sslcookie => {
+               type => "boolean",
+               default => 0,
+               description => "only send cookies over SSL connections?",
+               advanced => 1,
+               safe => 1,
+               rebuild => 0,
+       },
+       default_pageext => {
+               type => "string",
+               default => "mdwn",
+               description => "extension to use for new pages",
+               safe => 0, # not sanitized
+               rebuild => 0,
+       },
+       htmlext => {
+               type => "string",
+               default => "html",
+               description => "extension to use for html files",
+               safe => 0, # not sanitized
+               rebuild => 1,
+       },
+       timeformat => {
+               type => "string",
+               default => '%c',
+               description => "strftime format string to display date",
+               advanced => 1,
+               safe => 1,
+               rebuild => 1,
+       },
+       locale => {
+               type => "string",
+               default => undef,
+               example => "en_US.UTF-8",
+               description => "UTF-8 locale to use",
+               advanced => 1,
+               safe => 0,
+               rebuild => 1,
+       },
+       userdir => {
+               type => "string",
+               default => "",
+               example => "users",
+               description => "put user pages below specified page",
+               safe => 1,
+               rebuild => 1,
+       },
+       numbacklinks => {
+               type => "integer",
+               default => 10,
+               description => "how many backlinks to show before hiding excess (0 to show all)",
+               safe => 1,
+               rebuild => 1,
+       },
+       hardlink => {
+               type => "boolean",
+               default => 0,
+               description => "attempt to hardlink source files? (optimisation for large files)",
+               advanced => 1,
+               safe => 0, # paranoia
+               rebuild => 0,
+       },
+       umask => {
+               type => "integer",
+               example => "022",
+               description => "force ikiwiki to use a particular umask",
+               advanced => 1,
+               safe => 0, # paranoia
+               rebuild => 0,
+       },
+       wrappergroup => {
+               type => "string",
+               example => "ikiwiki",
+               description => "group for wrappers to run in",
+               advanced => 1,
+               safe => 0, # paranoia
+               rebuild => 0,
+       },
+       libdir => {
+               type => "string",
+               default => "",
+               example => "$ENV{HOME}/.ikiwiki/",
+               description => "extra library and plugin directory",
+               advanced => 1,
+               safe => 0, # directory
+               rebuild => 0,
+       },
+       ENV => {
+               type => "string", 
+               default => {},
+               description => "environment variables",
+               safe => 0, # paranoia
+               rebuild => 0,
+       },
+       exclude => {
+               type => "string",
+               default => undef,
+               example => '\.wav$',
+               description => "regexp of source files to ignore",
+               advanced => 1,
+               safe => 0, # regexp
+               rebuild => 1,
+       },
+       wiki_file_prune_regexps => {
+               type => "internal",
+               default => [qr/(^|\/)\.\.(\/|$)/, qr/^\./, qr/\/\./,
+                       qr/\.x?html?$/, qr/\.ikiwiki-new$/,
+                       qr/(^|\/).svn\//, qr/.arch-ids\//, qr/{arch}\//,
+                       qr/(^|\/)_MTN\//, qr/(^|\/)_darcs\//,
+                       qr/(^|\/)CVS\//, qr/\.dpkg-tmp$/],
+               description => "regexps of source files to ignore",
+               safe => 0,
+               rebuild => 1,
+       },
+       wiki_file_chars => {
+               type => "string",
+               description => "specifies the characters that are allowed in source filenames",
+               default => "-[:alnum:]+/.:_",
+               safe => 0,
+               rebuild => 1,
+       },
+       wiki_file_regexp => {
+               type => "internal",
+               description => "regexp of legal source files",
+               safe => 0,
+               rebuild => 1,
+       },
+       web_commit_regexp => {
+               type => "internal",
+               default => qr/^web commit (by (.*?(?=: |$))|from ([0-9a-fA-F:.]+[0-9a-fA-F])):?(.*)/,
+               description => "regexp to parse web commits from logs",
+               safe => 0,
+               rebuild => 0,
+       },
+       cgi => {
+               type => "internal",
+               default => 0,
+               description => "run as a cgi",
+               safe => 0,
+               rebuild => 0,
+       },
+       cgi_disable_uploads => {
+               type => "internal",
+               default => 1,
+               description => "whether CGI should accept file uploads",
+               safe => 0,
+               rebuild => 0,
+       },
+       post_commit => {
+               type => "internal",
+               default => 0,
+               description => "run as a post-commit hook",
+               safe => 0,
+               rebuild => 0,
+       },
+       rebuild => {
+               type => "internal",
+               default => 0,
+               description => "running in rebuild mode",
+               safe => 0,
+               rebuild => 0,
+       },
+       setup => {
+               type => "internal",
+               default => undef,
+               description => "running in setup mode",
+               safe => 0,
+               rebuild => 0,
+       },
+       refresh => {
+               type => "internal",
+               default => 0,
+               description => "running in refresh mode",
+               safe => 0,
+               rebuild => 0,
+       },
+       test_receive => {
+               type => "internal",
+               default => 0,
+               description => "running in receive test mode",
+               safe => 0,
+               rebuild => 0,
+       },
+       getctime => {
+               type => "internal",
+               default => 0,
+               description => "running in getctime mode",
+               safe => 0,
+               rebuild => 0,
+       },
+       w3mmode => {
+               type => "internal",
+               default => 0,
+               description => "running in w3mmode",
+               safe => 0,
+               rebuild => 0,
+       },
+       wikistatedir => {
+               type => "internal",
+               default => undef,
+               description => "path to the .ikiwiki directory holding ikiwiki state",
+               safe => 0,
+               rebuild => 0,
+       },
+       setupfile => {
+               type => "internal",
+               default => undef,
+               description => "path to setup file",
+               safe => 0,
+               rebuild => 0,
+       },
+       allow_symlinks_before_srcdir => {
+               type => "boolean",
+               default => 0,
+               description => "allow symlinks in the path leading to the srcdir (potentially insecure)",
+               safe => 0,
+               rebuild => 0,
+       },
+}
+
+sub defaultconfig () {
+       my %s=getsetup();
+       my @ret;
+       foreach my $key (keys %s) {
+               push @ret, $key, $s{$key}->{default};
+       }
+       use Data::Dumper;
+       return @ret;
+}
 
 
-my $installdir=''; # INSTALLDIR_AUTOREPLACE done by Makefile, DNE
-our $version='unknown'; # VERSION_AUTOREPLACE done by Makefile, DNE
-
-sub defaultconfig () { #{{{
-       wiki_file_prune_regexp => qr{((^|/).svn/|\.\.|^\.|\/\.|\.x?html?$|\.rss$|\.atom$|.arch-ids/|{arch}/)},
-       wiki_link_regexp => qr/\[\[(?:([^\]\|]+)\|)?([^\s\]]+)\]\]/,
-       wiki_file_regexp => qr/(^[-[:alnum:]_.:\/+]+$)/,
-       web_commit_regexp => qr/^web commit (by (.*?(?=: |$))|from (\d+\.\d+\.\d+\.\d+)):?(.*)/,
-       verbose => 0,
-       syslog => 0,
-       wikiname => "wiki",
-       default_pageext => "mdwn",
-       cgi => 0,
-       rcs => 'svn',
-       notify => 0,
-       url => '',
-       cgiurl => '',
-       historyurl => '',
-       diffurl => '',
-       anonok => 0,
-       rss => 0,
-       atom => 0,
-       discussion => 1,
-       rebuild => 0,
-       refresh => 0,
-       getctime => 0,
-       w3mmode => 0,
-       wrapper => undef,
-       wrappermode => undef,
-       svnrepo => undef,
-       svnpath => "trunk",
-       srcdir => undef,
-       destdir => undef,
-       pingurl => [],
-       templatedir => "$installdir/share/ikiwiki/templates",
-       underlaydir => "$installdir/share/ikiwiki/basewiki",
-       setup => undef,
-       adminuser => undef,
-       adminemail => undef,
-       plugin => [qw{mdwn inline htmlscrubber passwordauth}],
-       timeformat => '%c',
-       locale => undef,
-       sslcookie => 0,
-       httpauth => 0,
-} #}}}
-   
-sub checkconfig () { #{{{
+sub checkconfig () {
        # locale stuff; avoid LC_ALL since it overrides everything
        if (defined $ENV{LC_ALL}) {
                $ENV{LANG} = $ENV{LC_ALL};
                delete $ENV{LC_ALL};
        }
        if (defined $config{locale}) {
        # locale stuff; avoid LC_ALL since it overrides everything
        if (defined $ENV{LC_ALL}) {
                $ENV{LANG} = $ENV{LC_ALL};
                delete $ENV{LC_ALL};
        }
        if (defined $config{locale}) {
-               eval q{use POSIX};
-               error($@) if $@;
-               $ENV{LANG} = $config{locale}
-                       if POSIX::setlocale(&POSIX::LC_TIME, $config{locale});
+               if (POSIX::setlocale(&POSIX::LC_ALL, $config{locale})) {
+                       $ENV{LANG}=$config{locale};
+                       define_gettext();
+               }
+       }
+               
+       if (! defined $config{wiki_file_regexp}) {
+               $config{wiki_file_regexp}=qr/(^[$config{wiki_file_chars}]+$)/;
+       }
+
+       if (ref $config{ENV} eq 'HASH') {
+               foreach my $val (keys %{$config{ENV}}) {
+                       $ENV{$val}=$config{ENV}{$val};
+               }
        }
 
        if ($config{w3mmode}) {
        }
 
        if ($config{w3mmode}) {
@@ -93,154 +504,287 @@ sub checkconfig () { #{{{
        }
 
        if ($config{cgi} && ! length $config{url}) {
        }
 
        if ($config{cgi} && ! length $config{url}) {
-               error("Must specify url to wiki with --url when using --cgi\n");
-       }
-       if (($config{rss} || $config{atom}) && ! length $config{url}) {
-               error("Must specify url to wiki with --url when using --rss or --atom\n");
+               error(gettext("Must specify url to wiki with --url when using --cgi"));
        }
        
        $config{wikistatedir}="$config{srcdir}/.ikiwiki"
        }
        
        $config{wikistatedir}="$config{srcdir}/.ikiwiki"
-               unless exists $config{wikistatedir};
-       
-       if ($config{rcs}) {
-               eval qq{require IkiWiki::Rcs::$config{rcs}};
-               if ($@) {
-                       error("Failed to load RCS module IkiWiki::Rcs::$config{rcs}: $@");
+               unless exists $config{wikistatedir} && defined $config{wikistatedir};
+
+       if (defined $config{umask}) {
+               umask(possibly_foolish_untaint($config{umask}));
+       }
+
+       run_hooks(checkconfig => sub { shift->() });
+
+       return 1;
+}
+
+sub listplugins () {
+       my %ret;
+
+       foreach my $dir (@INC, $config{libdir}) {
+               next unless defined $dir && length $dir;
+               foreach my $file (glob("$dir/IkiWiki/Plugin/*.pm")) {
+                       my ($plugin)=$file=~/.*\/(.*)\.pm$/;
+                       $ret{$plugin}=1;
                }
        }
                }
        }
-       else {
-               require IkiWiki::Rcs::Stub;
+       foreach my $dir ($config{libdir}, "$installdir/lib/ikiwiki") {
+               next unless defined $dir && length $dir;
+               foreach my $file (glob("$dir/plugins/*")) {
+                       $ret{basename($file)}=1 if -x $file;
+               }
        }
 
        }
 
-       run_hooks(checkconfig => sub { shift->() });
-} #}}}
+       return keys %ret;
+}
+
+sub loadplugins () {
+       if (defined $config{libdir} && length $config{libdir}) {
+               unshift @INC, possibly_foolish_untaint($config{libdir});
+       }
 
 
-sub loadplugins () { #{{{
-       foreach my $plugin (@{$config{plugin}}) {
-               my $mod="IkiWiki::Plugin::".possibly_foolish_untaint($plugin);
-               eval qq{use $mod};
-               if ($@) {
-                       error("Failed to load plugin $mod: $@");
+       foreach my $plugin (@{$config{default_plugins}}, @{$config{add_plugins}}) {
+               loadplugin($plugin);
+       }
+       
+       if ($config{rcs}) {
+               if (exists $hooks{rcs}) {
+                       error(gettext("cannot use multiple rcs plugins"));
                }
                }
+               loadplugin($config{rcs});
+       }
+       if (! exists $hooks{rcs}) {
+               loadplugin("norcs");
        }
        }
+
        run_hooks(getopt => sub { shift->() });
        if (grep /^-/, @ARGV) {
        run_hooks(getopt => sub { shift->() });
        if (grep /^-/, @ARGV) {
-               print STDERR "Unknown option: $_\n"
+               print STDERR "Unknown option (or missing parameter): $_\n"
                        foreach grep /^-/, @ARGV;
                usage();
        }
                        foreach grep /^-/, @ARGV;
                usage();
        }
-} #}}}
 
 
-sub error ($) { #{{{
-       if ($config{cgi}) {
-               print "Content-type: text/html\n\n";
-               print misctemplate("Error", "<p>Error: @_</p>");
+       return 1;
+}
+
+sub loadplugin ($) {
+       my $plugin=shift;
+
+       return if grep { $_ eq $plugin} @{$config{disable_plugins}};
+
+       foreach my $dir (defined $config{libdir} ? possibly_foolish_untaint($config{libdir}) : undef,
+                        "$installdir/lib/ikiwiki") {
+               if (defined $dir && -x "$dir/plugins/$plugin") {
+                       eval { require IkiWiki::Plugin::external };
+                       if ($@) {
+                               my $reason=$@;
+                               error(sprintf(gettext("failed to load external plugin needed for %s plugin: %s"), $plugin, $reason));
+                       }
+                       import IkiWiki::Plugin::external "$dir/plugins/$plugin";
+                       $loaded_plugins{$plugin}=1;
+                       return 1;
+               }
+       }
+
+       my $mod="IkiWiki::Plugin::".possibly_foolish_untaint($plugin);
+       eval qq{use $mod};
+       if ($@) {
+               error("Failed to load plugin $mod: $@");
+       }
+       $loaded_plugins{$plugin}=1;
+       return 1;
+}
+
+sub error ($;$) {
+       my $message=shift;
+       my $cleaner=shift;
+       log_message('err' => $message) if $config{syslog};
+       if (defined $cleaner) {
+               $cleaner->();
        }
        }
-       log_message(error => @_);
-       exit(1);
-} #}}}
+       die $message."\n";
+}
 
 
-sub debug ($) { #{{{
+sub debug ($) {
        return unless $config{verbose};
        return unless $config{verbose};
-       log_message(debug => @_);
-} #}}}
+       return log_message(debug => @_);
+}
 
 my $log_open=0;
 
 my $log_open=0;
-sub log_message ($$) { #{{{
+sub log_message ($$) {
        my $type=shift;
 
        if ($config{syslog}) {
                require Sys::Syslog;
        my $type=shift;
 
        if ($config{syslog}) {
                require Sys::Syslog;
-               unless ($log_open) {
+               if (! $log_open) {
                        Sys::Syslog::setlogsock('unix');
                        Sys::Syslog::openlog('ikiwiki', '', 'user');
                        $log_open=1;
                }
                        Sys::Syslog::setlogsock('unix');
                        Sys::Syslog::openlog('ikiwiki', '', 'user');
                        $log_open=1;
                }
-               eval {
-                       Sys::Syslog::syslog($type, join(" ", @_));
-               }
+               return eval {
+                       Sys::Syslog::syslog($type, "[$config{wikiname}] %s", join(" ", @_));
+               };
        }
        elsif (! $config{cgi}) {
        }
        elsif (! $config{cgi}) {
-               print "@_\n";
+               return print "@_\n";
        }
        else {
        }
        else {
-               print STDERR "@_\n";
+               return print STDERR "@_\n";
        }
        }
-} #}}}
+}
 
 
-sub possibly_foolish_untaint ($) { #{{{
+sub possibly_foolish_untaint ($) {
        my $tainted=shift;
        my $tainted=shift;
-       my ($untainted)=$tainted=~/(.*)/;
+       my ($untainted)=$tainted=~/(.*)/s;
        return $untainted;
        return $untainted;
-} #}}}
+}
 
 
-sub basename ($) { #{{{
+sub basename ($) {
        my $file=shift;
 
        $file=~s!.*/+!!;
        return $file;
        my $file=shift;
 
        $file=~s!.*/+!!;
        return $file;
-} #}}}
+}
 
 
-sub dirname ($) { #{{{
+sub dirname ($) {
        my $file=shift;
 
        $file=~s!/*[^/]+$!!;
        return $file;
        my $file=shift;
 
        $file=~s!/*[^/]+$!!;
        return $file;
-} #}}}
+}
 
 
-sub pagetype ($) { #{{{
+sub isinternal ($) {
        my $page=shift;
        my $page=shift;
+       return exists $pagesources{$page} &&
+               $pagesources{$page} =~ /\._([^.]+)$/;
+}
+
+sub pagetype ($) {
+       my $file=shift;
        
        
-       if ($page =~ /\.([^.]+)$/) {
+       if ($file =~ /\.([^.]+)$/) {
                return $1 if exists $hooks{htmlize}{$1};
        }
                return $1 if exists $hooks{htmlize}{$1};
        }
-       return undef;
-} #}}}
+       my $base=basename($file);
+       if (exists $hooks{htmlize}{$base} &&
+           $hooks{htmlize}{$base}{noextension}) {
+               return $base;
+       }
+       return;
+}
 
 
-sub pagename ($) { #{{{
+my %pagename_cache;
+
+sub pagename ($) {
        my $file=shift;
 
        my $file=shift;
 
+       if (exists $pagename_cache{$file}) {
+               return $pagename_cache{$file};
+       }
+
        my $type=pagetype($file);
        my $page=$file;
        my $type=pagetype($file);
        my $page=$file;
-       $page=~s/\Q.$type\E*$// if defined $type;
+       $page=~s/\Q.$type\E*$//
+               if defined $type && !$hooks{htmlize}{$type}{keepextension}
+                       && !$hooks{htmlize}{$type}{noextension};
+       if ($config{indexpages} && $page=~/(.*)\/index$/) {
+               $page=$1;
+       }
+
+       $pagename_cache{$file} = $page;
        return $page;
        return $page;
-} #}}}
+}
 
 
-sub htmlpage ($) { #{{{
+sub newpagefile ($$) {
        my $page=shift;
        my $page=shift;
+       my $type=shift;
 
 
-       return $page.".html";
-} #}}}
+       if (! $config{indexpages} || $page eq 'index') {
+               return $page.".".$type;
+       }
+       else {
+               return $page."/index.".$type;
+       }
+}
 
 
-sub srcfile ($) { #{{{
+sub targetpage ($$;$) {
+       my $page=shift;
+       my $ext=shift;
+       my $filename=shift;
+       
+       if (defined $filename) {
+               return $page."/".$filename.".".$ext;
+       }
+       elsif (! $config{usedirs} || $page eq 'index') {
+               return $page.".".$ext;
+       }
+       else {
+               return $page."/index.".$ext;
+       }
+}
+
+sub htmlpage ($) {
+       my $page=shift;
+       
+       return targetpage($page, $config{htmlext});
+}
+
+sub srcfile_stat {
        my $file=shift;
        my $file=shift;
+       my $nothrow=shift;
+
+       return "$config{srcdir}/$file", stat(_) if -e "$config{srcdir}/$file";
+       foreach my $dir (@{$config{underlaydirs}}, $config{underlaydir}) {
+               return "$dir/$file", stat(_) if -e "$dir/$file";
+       }
+       error("internal error: $file cannot be found in $config{srcdir} or underlay") unless $nothrow;
+       return;
+}
+
+sub srcfile ($;$) {
+       return (srcfile_stat(@_))[0];
+}
+
+sub add_underlay ($) {
+       my $dir=shift;
+
+       if ($dir !~ /^\//) {
+               $dir="$config{underlaydirbase}/$dir";
+       }
+
+       if (! grep { $_ eq $dir } @{$config{underlaydirs}}) {
+               unshift @{$config{underlaydirs}}, $dir;
+       }
 
 
-       return "$config{srcdir}/$file" if -e "$config{srcdir}/$file";
-       return "$config{underlaydir}/$file" if -e "$config{underlaydir}/$file";
-       error("internal error: $file cannot be found");
-} #}}}
+       return 1;
+}
 
 
-sub readfile ($;$) { #{{{
+sub readfile ($;$$) {
        my $file=shift;
        my $binary=shift;
        my $file=shift;
        my $binary=shift;
+       my $wantfd=shift;
 
        if (-l $file) {
                error("cannot read a symlink ($file)");
        }
        
        local $/=undef;
 
        if (-l $file) {
                error("cannot read a symlink ($file)");
        }
        
        local $/=undef;
-       open (IN, $file) || error("failed to read $file: $!");
-       binmode(IN) if ($binary);
-       my $ret=<IN>;
-       close IN;
+       open (my $in, "<", $file) || error("failed to read $file: $!");
+       binmode($in) if ($binary);
+       return \*$in if $wantfd;
+       my $ret=<$in>;
+       # check for invalid utf-8, and toss it back to avoid crashes
+       if (! utf8::valid($ret)) {
+               $ret=encode_utf8($ret);
+       }
+       close $in || error("failed to read $file: $!");
        return $ret;
        return $ret;
-} #}}}
+}
 
 
-sub writefile ($$$;$) { #{{{
-       my $file=shift; # can include subdirs
-       my $destdir=shift; # directory to put file in
-       my $content=shift;
-       my $binary=shift;
+sub prep_writefile ($$) {
+       my $file=shift;
+       my $destdir=shift;
        
        my $test=$file;
        while (length $test) {
        
        my $test=$file;
        while (length $test) {
@@ -260,22 +804,49 @@ sub writefile ($$$;$) { #{{{
                        }
                }
        }
                        }
                }
        }
+
+       return 1;
+}
+
+sub writefile ($$$;$$) {
+       my $file=shift; # can include subdirs
+       my $destdir=shift; # directory to put file in
+       my $content=shift;
+       my $binary=shift;
+       my $writer=shift;
+       
+       prep_writefile($file, $destdir);
+       
+       my $newfile="$destdir/$file.ikiwiki-new";
+       if (-l $newfile) {
+               error("cannot write to a symlink ($newfile)");
+       }
        
        
-       open (OUT, ">$destdir/$file") || error("failed to write $destdir/$file: $!");
-       binmode(OUT) if ($binary);
-       print OUT $content;
-       close OUT;
-} #}}}
+       my $cleanup = sub { unlink($newfile) };
+       open (my $out, '>', $newfile) || error("failed to write $newfile: $!", $cleanup);
+       binmode($out) if ($binary);
+       if ($writer) {
+               $writer->(\*$out, $cleanup);
+       }
+       else {
+               print $out $content or error("failed writing to $newfile: $!", $cleanup);
+       }
+       close $out || error("failed saving $newfile: $!", $cleanup);
+       rename($newfile, "$destdir/$file") || 
+               error("failed renaming $newfile to $destdir/$file: $!", $cleanup);
+
+       return 1;
+}
 
 my %cleared;
 
 my %cleared;
-sub will_render ($$;$) { #{{{
+sub will_render ($$;$) {
        my $page=shift;
        my $dest=shift;
        my $clear=shift;
 
        # Important security check.
        if (-e "$config{destdir}/$dest" && ! $config{rebuild} &&
        my $page=shift;
        my $dest=shift;
        my $clear=shift;
 
        # Important security check.
        if (-e "$config{destdir}/$dest" && ! $config{rebuild} &&
-           ! grep { $_ eq $dest } (@{$renderedfiles{$page}}, @{$oldrenderedfiles{$page}})) {
+           ! grep { $_ eq $dest } (@{$renderedfiles{$page}}, @{$oldrenderedfiles{$page}}, @{$wikistate{editpage}{previews}})) {
                error("$config{destdir}/$dest independently created, not overwriting with version from $page");
        }
 
                error("$config{destdir}/$dest independently created, not overwriting with version from $page");
        }
 
@@ -283,16 +854,28 @@ sub will_render ($$;$) { #{{{
                $renderedfiles{$page}=[$dest, grep { $_ ne $dest } @{$renderedfiles{$page}}];
        }
        else {
                $renderedfiles{$page}=[$dest, grep { $_ ne $dest } @{$renderedfiles{$page}}];
        }
        else {
+               foreach my $old (@{$renderedfiles{$page}}) {
+                       delete $destsources{$old};
+               }
                $renderedfiles{$page}=[$dest];
                $cleared{$page}=1;
        }
                $renderedfiles{$page}=[$dest];
                $cleared{$page}=1;
        }
-} #}}}
+       $destsources{$dest}=$page;
 
 
-sub bestlink ($$) { #{{{
+       return 1;
+}
+
+sub bestlink ($$) {
        my $page=shift;
        my $link=shift;
        
        my $cwd=$page;
        my $page=shift;
        my $link=shift;
        
        my $cwd=$page;
+       if ($link=~s/^\/+//) {
+               # absolute links
+               $cwd="";
+       }
+       $link=~s/\/$//;
+
        do {
                my $l=$cwd;
                $l.="/" if length $l;
        do {
                my $l=$cwd;
                $l.="/" if length $l;
@@ -304,52 +887,79 @@ sub bestlink ($$) { #{{{
                elsif (exists $pagecase{lc $l}) {
                        return $pagecase{lc $l};
                }
                elsif (exists $pagecase{lc $l}) {
                        return $pagecase{lc $l};
                }
-       } while $cwd=~s!/?[^/]+$!!;
+       } while $cwd=~s{/?[^/]+$}{};
+
+       if (length $config{userdir}) {
+               my $l = "$config{userdir}/".lc($link);
+               if (exists $links{$l}) {
+                       return $l;
+               }
+               elsif (exists $pagecase{lc $l}) {
+                       return $pagecase{lc $l};
+               }
+       }
 
        #print STDERR "warning: page $page, broken link: $link\n";
        return "";
 
        #print STDERR "warning: page $page, broken link: $link\n";
        return "";
-} #}}}
+}
 
 
-sub isinlinableimage ($) { #{{{
+sub isinlinableimage ($) {
        my $file=shift;
        
        my $file=shift;
        
-       $file=~/\.(png|gif|jpg|jpeg)$/i;
-} #}}}
+       return $file =~ /\.(png|gif|jpg|jpeg)$/i;
+}
 
 
-sub pagetitle ($) { #{{{
+sub pagetitle ($;$) {
        my $page=shift;
        my $page=shift;
-       $page=~s/__(\d+)__/&#$1;/g;
-       $page=~y/_/ /;
+       my $unescaped=shift;
+
+       if ($unescaped) {
+               $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : chr($2)/eg;
+       }
+       else {
+               $page=~s/(__(\d+)__|_)/$1 eq '_' ? ' ' : "&#$2;"/eg;
+       }
+
        return $page;
        return $page;
-} #}}}
+}
 
 
-sub titlepage ($) { #{{{
+sub titlepage ($) {
        my $title=shift;
        my $title=shift;
-       $title=~y/ /_/;
-       $title=~s/([^-[:alnum:]_:+\/.])/"__".ord($1)."__"/eg;
+       # support use w/o %config set
+       my $chars = defined $config{wiki_file_chars} ? $config{wiki_file_chars} : "-[:alnum:]+/.:_";
+       $title=~s/([^$chars]|_)/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
        return $title;
        return $title;
-} #}}}
+}
+
+sub linkpage ($) {
+       my $link=shift;
+       my $chars = defined $config{wiki_file_chars} ? $config{wiki_file_chars} : "-[:alnum:]+/.:_";
+       $link=~s/([^$chars])/$1 eq ' ' ? '_' : "__".ord($1)."__"/eg;
+       return $link;
+}
 
 
-sub cgiurl (@) { #{{{
+sub cgiurl (@) {
        my %params=@_;
 
        my %params=@_;
 
-       return $config{cgiurl}."?".join("&amp;", map "$_=$params{$_}", keys %params);
-} #}}}
+       return $config{cgiurl}."?".
+               join("&amp;", map $_."=".uri_escape_utf8($params{$_}), keys %params);
+}
 
 
-sub baseurl (;$) { #{{{
+sub baseurl (;$) {
        my $page=shift;
 
        return "$config{url}/" if ! defined $page;
        
        my $page=shift;
 
        return "$config{url}/" if ! defined $page;
        
+       $page=htmlpage($page);
        $page=~s/[^\/]+$//;
        $page=~s/[^\/]+\//..\//g;
        return $page;
        $page=~s/[^\/]+$//;
        $page=~s/[^\/]+\//..\//g;
        return $page;
-} #}}}
+}
 
 
-sub abs2rel ($$) { #{{{
+sub abs2rel ($$) {
        # Work around very innefficient behavior in File::Spec if abs2rel
        # is passed two relative paths. It's much faster if paths are
        # Work around very innefficient behavior in File::Spec if abs2rel
        # is passed two relative paths. It's much faster if paths are
-       # absolute! (Debian bug #376658)
+       # absolute! (Debian bug #376658; fixed in debian unstable now)
        my $path="/".shift;
        my $base="/".shift;
 
        my $path="/".shift;
        my $base="/".shift;
 
@@ -357,64 +967,189 @@ sub abs2rel ($$) { #{{{
        my $ret=File::Spec->abs2rel($path, $base);
        $ret=~s/^// if defined $ret;
        return $ret;
        my $ret=File::Spec->abs2rel($path, $base);
        $ret=~s/^// if defined $ret;
        return $ret;
-} #}}}
+}
 
 
-sub displaytime ($) { #{{{
+sub displaytime ($;$) {
+       # Plugins can override this function to mark up the time to
+       # display.
+       return '<span class="date">'.formattime(@_).'</span>';
+}
+
+sub formattime ($;$) {
+       # Plugins can override this function to format the time.
        my $time=shift;
        my $time=shift;
+       my $format=shift;
+       if (! defined $format) {
+               $format=$config{timeformat};
+       }
 
 
-       eval q{use POSIX};
-       error($@) if $@;
        # strftime doesn't know about encodings, so make sure
        # its output is properly treated as utf8
        # strftime doesn't know about encodings, so make sure
        # its output is properly treated as utf8
-       return decode_utf8(POSIX::strftime(
-                       $config{timeformat}, localtime($time)));
-} #}}}
+       return decode_utf8(POSIX::strftime($format, localtime($time)));
+}
+
+sub beautify_urlpath ($) {
+       my $url=shift;
+
+       # Ensure url is not an empty link, and if necessary,
+       # add ./ to avoid colon confusion.
+       if ($url !~ /^\// && $url !~ /^\.\.?\//) {
+               $url="./$url";
+       }
 
 
-sub htmllink ($$$;$$$) { #{{{
+       if ($config{usedirs}) {
+               $url =~ s!/index.$config{htmlext}$!/!;
+       }
+
+       return $url;
+}
+
+sub urlto ($$;$) {
+       my $to=shift;
+       my $from=shift;
+       my $absolute=shift;
+       
+       if (! length $to) {
+               return beautify_urlpath(baseurl($from)."index.$config{htmlext}");
+       }
+
+       if (! $destsources{$to}) {
+               $to=htmlpage($to);
+       }
+
+       if ($absolute) {
+               return $config{url}.beautify_urlpath("/".$to);
+       }
+
+       my $link = abs2rel($to, dirname(htmlpage($from)));
+
+       return beautify_urlpath($link);
+}
+
+sub htmllink ($$$;@) {
        my $lpage=shift; # the page doing the linking
        my $page=shift; # the page that will contain the link (different for inline)
        my $link=shift;
        my $lpage=shift; # the page doing the linking
        my $page=shift; # the page that will contain the link (different for inline)
        my $link=shift;
-       my $noimageinline=shift; # don't turn links into inline html images
-       my $forcesubpage=shift; # force a link to a subpage
-       my $linktext=shift; # set to force the link text to something
+       my %opts=@_;
+
+       $link=~s/\/$//;
 
        my $bestlink;
 
        my $bestlink;
-       if (! $forcesubpage) {
+       if (! $opts{forcesubpage}) {
                $bestlink=bestlink($lpage, $link);
        }
        else {
                $bestlink="$lpage/".lc($link);
        }
 
                $bestlink=bestlink($lpage, $link);
        }
        else {
                $bestlink="$lpage/".lc($link);
        }
 
-       $linktext=pagetitle(basename($link)) unless defined $linktext;
+       my $linktext;
+       if (defined $opts{linktext}) {
+               $linktext=$opts{linktext};
+       }
+       else {
+               $linktext=pagetitle(basename($link));
+       }
        
        return "<span class=\"selflink\">$linktext</span>"
        
        return "<span class=\"selflink\">$linktext</span>"
-               if length $bestlink && $page eq $bestlink;
+               if length $bestlink && $page eq $bestlink &&
+                  ! defined $opts{anchor};
        
        
-       # TODO BUG: %renderedfiles may not have it, if the linked to page
-       # was also added and isn't yet rendered! Note that this bug is
-       # masked by the bug that makes all new files be rendered twice.
-       if (! grep { $_ eq $bestlink } map { @{$_} } values %renderedfiles) {
+       if (! $destsources{$bestlink}) {
                $bestlink=htmlpage($bestlink);
                $bestlink=htmlpage($bestlink);
-       }
-       if (! grep { $_ eq $bestlink } map { @{$_} } values %renderedfiles) {
-               return "<span><a href=\"".
-                       cgiurl(do => "create", page => lc($link), from => $page).
-                       "\">?</a>$linktext</span>"
+
+               if (! $destsources{$bestlink}) {
+                       return $linktext unless length $config{cgiurl};
+                       return "<span class=\"createlink\"><a href=\"".
+                               cgiurl(
+                                       do => "create",
+                                       page => lc($link),
+                                       from => $lpage
+                               ).
+                               "\" rel=\"nofollow\">?</a>$linktext</span>"
+               }
        }
        
        }
        
-       $bestlink=abs2rel($bestlink, dirname($page));
+       $bestlink=abs2rel($bestlink, dirname(htmlpage($page)));
+       $bestlink=beautify_urlpath($bestlink);
        
        
-       if (! $noimageinline && isinlinableimage($bestlink)) {
+       if (! $opts{noimageinline} && isinlinableimage($bestlink)) {
                return "<img src=\"$bestlink\" alt=\"$linktext\" />";
        }
                return "<img src=\"$bestlink\" alt=\"$linktext\" />";
        }
-       return "<a href=\"$bestlink\">$linktext</a>";
-} #}}}
 
 
-sub htmlize ($$$) { #{{{
+       if (defined $opts{anchor}) {
+               $bestlink.="#".$opts{anchor};
+       }
+
+       my @attrs;
+       if (defined $opts{rel}) {
+               push @attrs, ' rel="'.$opts{rel}.'"';
+       }
+       if (defined $opts{class}) {
+               push @attrs, ' class="'.$opts{class}.'"';
+       }
+
+       return "<a href=\"$bestlink\"@attrs>$linktext</a>";
+}
+
+sub openiduser ($) {
+       my $user=shift;
+
+       if ($user =~ m!^https?://! &&
+           eval q{use Net::OpenID::VerifiedIdentity; 1} && !$@) {
+               my $display;
+
+               if (Net::OpenID::VerifiedIdentity->can("DisplayOfURL")) {
+                       # this works in at least 2.x
+                       $display = Net::OpenID::VerifiedIdentity::DisplayOfURL($user);
+               }
+               else {
+                       # this only works in 1.x
+                       my $oid=Net::OpenID::VerifiedIdentity->new(identity => $user);
+                       $display=$oid->display;
+               }
+
+               # Convert "user.somehost.com" to "user [somehost.com]"
+               # (also "user.somehost.co.uk")
+               if ($display !~ /\[/) {
+                       $display=~s/^([-a-zA-Z0-9]+?)\.([-.a-zA-Z0-9]+\.[a-z]+)$/$1 [$2]/;
+               }
+               # Convert "http://somehost.com/user" to "user [somehost.com]".
+               # (also "https://somehost.com/user/")
+               if ($display !~ /\[/) {
+                       $display=~s/^https?:\/\/(.+)\/([^\/]+)\/?$/$2 [$1]/;
+               }
+               $display=~s!^https?://!!; # make sure this is removed
+               eval q{use CGI 'escapeHTML'};
+               error($@) if $@;
+               return escapeHTML($display);
+       }
+       return;
+}
+
+sub userlink ($) {
+       my $user=shift;
+
+       my $oiduser=eval { openiduser($user) };
+       if (defined $oiduser) {
+               return "<a href=\"$user\">$oiduser</a>";
+       }
+       else {
+               eval q{use CGI 'escapeHTML'};
+               error($@) if $@;
+
+               return htmllink("", "", escapeHTML(
+                       length $config{userdir} ? $config{userdir}."/".$user : $user
+               ), noimageinline => 1);
+       }
+}
+
+sub htmlize ($$$$) {
        my $page=shift;
        my $page=shift;
+       my $destpage=shift;
        my $type=shift;
        my $content=shift;
        my $type=shift;
        my $content=shift;
+       
+       my $oneline = $content !~ /\n/;
 
        if (exists $hooks{htmlize}{$type}) {
                $content=$hooks{htmlize}{$type}{call}->(
 
        if (exists $hooks{htmlize}{$type}) {
                $content=$hooks{htmlize}{$type}{call}->(
@@ -429,46 +1164,77 @@ sub htmlize ($$$) { #{{{
        run_hooks(sanitize => sub {
                $content=shift->(
                        page => $page,
        run_hooks(sanitize => sub {
                $content=shift->(
                        page => $page,
+                       destpage => $destpage,
                        content => $content,
                );
        });
                        content => $content,
                );
        });
+       
+       if ($oneline) {
+               # hack to get rid of enclosing junk added by markdown
+               # and other htmlizers
+               $content=~s/^<p>//i;
+               $content=~s/<\/p>$//i;
+               chomp $content;
+       }
 
        return $content;
 
        return $content;
-} #}}}
+}
 
 
-sub linkify ($$$) { #{{{
-       my $lpage=shift; # the page containing the links
-       my $page=shift; # the page the link will end up on (different for inline)
+sub linkify ($$$) {
+       my $page=shift;
+       my $destpage=shift;
        my $content=shift;
 
        my $content=shift;
 
-       $content =~ s{(\\?)$config{wiki_link_regexp}}{
-               $2 ? ( $1 ? "[[$2|$3]]" : htmllink($lpage, $page, titlepage($3), 0, 0, pagetitle($2)))
-                  : ( $1 ? "[[$3]]" :    htmllink($lpage, $page, titlepage($3)))
-       }eg;
+       run_hooks(linkify => sub {
+               $content=shift->(
+                       page => $page,
+                       destpage => $destpage,
+                       content => $content,
+               );
+       });
        
        return $content;
        
        return $content;
-} #}}}
+}
 
 
-my %preprocessing;
-sub preprocess ($$$;$) { #{{{
+our %preprocessing;
+our $preprocess_preview=0;
+sub preprocess ($$$;$$) {
        my $page=shift; # the page the data comes from
        my $destpage=shift; # the page the data will appear in (different for inline)
        my $content=shift;
        my $scan=shift;
        my $page=shift; # the page the data comes from
        my $destpage=shift; # the page the data will appear in (different for inline)
        my $content=shift;
        my $scan=shift;
+       my $preview=shift;
+
+       # Using local because it needs to be set within any nested calls
+       # of this function.
+       local $preprocess_preview=$preview if defined $preview;
 
        my $handle=sub {
                my $escape=shift;
 
        my $handle=sub {
                my $escape=shift;
+               my $prefix=shift;
                my $command=shift;
                my $params=shift;
                my $command=shift;
                my $params=shift;
+               $params="" if ! defined $params;
+
                if (length $escape) {
                if (length $escape) {
-                       return "[[$command $params]]";
+                       return "[[$prefix$command $params]]";
                }
                elsif (exists $hooks{preprocess}{$command}) {
                        return "" if $scan && ! $hooks{preprocess}{$command}{scan};
                        # Note: preserve order of params, some plugins may
                        # consider it significant.
                        my @params;
                }
                elsif (exists $hooks{preprocess}{$command}) {
                        return "" if $scan && ! $hooks{preprocess}{$command}{scan};
                        # Note: preserve order of params, some plugins may
                        # consider it significant.
                        my @params;
-                       while ($params =~ /(?:(\w+)=)?(?:"""(.*?)"""|"([^"]+)"|(\S+))(?:\s+|$)/sg) {
+                       while ($params =~ m{
+                               (?:([-\w]+)=)?          # 1: named parameter key?
+                               (?:
+                                       """(.*?)"""     # 2: triple-quoted value
+                               |
+                                       "([^"]+)"       # 3: single-quoted value
+                               |
+                                       (\S+)           # 4: unquoted value
+                               )
+                               (?:\s+|$)               # delimiter to next param
+                       }sgx) {
                                my $key=$1;
                                my $val;
                                if (defined $2) {
                                my $key=$1;
                                my $val;
                                if (defined $2) {
@@ -494,138 +1260,412 @@ sub preprocess ($$$;$) { #{{{
                        if ($preprocessing{$page}++ > 3) {
                                # Avoid loops of preprocessed pages preprocessing
                                # other pages that preprocess them, etc.
                        if ($preprocessing{$page}++ > 3) {
                                # Avoid loops of preprocessed pages preprocessing
                                # other pages that preprocess them, etc.
-                               return "[[$command preprocessing loop detected on $page at depth $preprocessing{$page}]]";
+                               return "[[!$command <span class=\"error\">".
+                                       sprintf(gettext("preprocessing loop detected on %s at depth %i"),
+                                               $page, $preprocessing{$page}).
+                                       "</span>]]";
+                       }
+                       my $ret;
+                       if (! $scan) {
+                               $ret=eval {
+                                       $hooks{preprocess}{$command}{call}->(
+                                               @params,
+                                               page => $page,
+                                               destpage => $destpage,
+                                               preview => $preprocess_preview,
+                                       );
+                               };
+                               if ($@) {
+                                       my $error=$@;
+                                       chomp $error;
+                                       $ret="[[!$command <span class=\"error\">".
+                                               gettext("Error").": $error"."</span>]]";
+                               }
+                       }
+                       else {
+                               # use void context during scan pass
+                               eval {
+                                       $hooks{preprocess}{$command}{call}->(
+                                               @params,
+                                               page => $page,
+                                               destpage => $destpage,
+                                               preview => $preprocess_preview,
+                                       );
+                               };
+                               $ret="";
                        }
                        }
-                       my $ret=$hooks{preprocess}{$command}{call}->(
-                               @params,
-                               page => $page,
-                               destpage => $destpage,
-                       );
                        $preprocessing{$page}--;
                        return $ret;
                }
                else {
                        $preprocessing{$page}--;
                        return $ret;
                }
                else {
-                       return "[[$command $params]]";
+                       return "[[$prefix$command $params]]";
                }
        };
        
                }
        };
        
-       $content =~ s{(\\?)\[\[(\w+)\s+((?:(?:\w+=)?(?:""".*?"""|"[^"]+"|[^\s\]]+)\s*)*)\]\]}{$handle->($1, $2, $3)}seg;
+       my $regex;
+       if ($config{prefix_directives}) {
+               $regex = qr{
+                       (\\?)           # 1: escape?
+                       \[\[(!)         # directive open; 2: prefix
+                       ([-\w]+)        # 3: command
+                       (               # 4: the parameters..
+                               \s+     # Must have space if parameters present
+                               (?:
+                                       (?:[-\w]+=)?            # named parameter key?
+                                       (?:
+                                               """.*?"""       # triple-quoted value
+                                               |
+                                               "[^"]+"         # single-quoted value
+                                               |
+                                               [^"\s\]]+       # unquoted value
+                                       )
+                                       \s*                     # whitespace or end
+                                                               # of directive
+                               )
+                       *)?             # 0 or more parameters
+                       \]\]            # directive closed
+               }sx;
+       }
+       else {
+               $regex = qr{
+                       (\\?)           # 1: escape?
+                       \[\[(!?)        # directive open; 2: optional prefix
+                       ([-\w]+)        # 3: command
+                       \s+
+                       (               # 4: the parameters..
+                               (?:
+                                       (?:[-\w]+=)?            # named parameter key?
+                                       (?:
+                                               """.*?"""       # triple-quoted value
+                                               |
+                                               "[^"]+"         # single-quoted value
+                                               |
+                                               [^"\s\]]+       # unquoted value
+                                       )
+                                       \s*                     # whitespace or end
+                                                               # of directive
+                               )
+                       *)              # 0 or more parameters
+                       \]\]            # directive closed
+               }sx;
+       }
+
+       $content =~ s{$regex}{$handle->($1, $2, $3, $4)}eg;
        return $content;
        return $content;
-} #}}}
+}
 
 
-sub filter ($$) { #{{{
+sub filter ($$$) {
        my $page=shift;
        my $page=shift;
+       my $destpage=shift;
        my $content=shift;
 
        run_hooks(filter => sub {
        my $content=shift;
 
        run_hooks(filter => sub {
-               $content=shift->(page => $page, content => $content);
+               $content=shift->(page => $page, destpage => $destpage, 
+                       content => $content);
        });
 
        return $content;
        });
 
        return $content;
-} #}}}
+}
 
 
-sub indexlink () { #{{{
+sub indexlink () {
        return "<a href=\"$config{url}\">$config{wikiname}</a>";
        return "<a href=\"$config{url}\">$config{wikiname}</a>";
-} #}}}
+}
 
 
-sub lockwiki () { #{{{
+sub check_canedit ($$$;$) {
+       my $page=shift;
+       my $q=shift;
+       my $session=shift;
+       my $nonfatal=shift;
+       
+       my $canedit;
+       run_hooks(canedit => sub {
+               return if defined $canedit;
+               my $ret=shift->($page, $q, $session);
+               if (defined $ret) {
+                       if ($ret eq "") {
+                               $canedit=1;
+                       }
+                       elsif (ref $ret eq 'CODE') {
+                               $ret->() unless $nonfatal;
+                               $canedit=0;
+                       }
+                       elsif (defined $ret) {
+                               error($ret) unless $nonfatal;
+                               $canedit=0;
+                       }
+               }
+       });
+       return defined $canedit ? $canedit : 1;
+}
+
+sub check_content (@) {
+       my %params=@_;
+       
+       return 1 if ! exists $hooks{checkcontent}; # optimisation
+
+       if (exists $pagesources{$params{page}}) {
+               my @diff;
+               my %old=map { $_ => 1 }
+                       split("\n", readfile(srcfile($pagesources{$params{page}})));
+               foreach my $line (split("\n", $params{content})) {
+                       push @diff, $line if ! exists $old{$_};
+               }
+               $params{diff}=join("\n", @diff);
+       }
+
+       my $ok;
+       run_hooks(checkcontent => sub {
+               return if defined $ok;
+               my $ret=shift->(%params);
+               if (defined $ret) {
+                       if ($ret eq "") {
+                               $ok=1;
+                       }
+                       elsif (ref $ret eq 'CODE') {
+                               $ret->() unless $params{nonfatal};
+                               $ok=0;
+                       }
+                       elsif (defined $ret) {
+                               error($ret) unless $params{nonfatal};
+                               $ok=0;
+                       }
+               }
+
+       });
+       return defined $ok ? $ok : 1;
+}
+
+my $wikilock;
+
+sub lockwiki () {
        # Take an exclusive lock on the wiki to prevent multiple concurrent
        # run issues. The lock will be dropped on program exit.
        if (! -d $config{wikistatedir}) {
                mkdir($config{wikistatedir});
        }
        # Take an exclusive lock on the wiki to prevent multiple concurrent
        # run issues. The lock will be dropped on program exit.
        if (! -d $config{wikistatedir}) {
                mkdir($config{wikistatedir});
        }
-       open(WIKILOCK, ">$config{wikistatedir}/lockfile") ||
+       open($wikilock, '>', "$config{wikistatedir}/lockfile") ||
                error ("cannot write to $config{wikistatedir}/lockfile: $!");
                error ("cannot write to $config{wikistatedir}/lockfile: $!");
-       if (! flock(WIKILOCK, 2 | 4)) {
-               debug("wiki seems to be locked, waiting for lock");
-               my $wait=600; # arbitrary, but don't hang forever to 
-                             # prevent process pileup
-               for (1..600) {
-                       return if flock(WIKILOCK, 2 | 4);
-                       sleep 1;
-               }
-               error("wiki is locked; waited $wait seconds without lock being freed (possible stuck process or stale lock?)");
-       }
-} #}}}
-
-sub unlockwiki () { #{{{
-       close WIKILOCK;
-} #}}}
-
-sub loadindex () { #{{{
-       open (IN, "$config{wikistatedir}/index") || return;
-       while (<IN>) {
-               $_=possibly_foolish_untaint($_);
-               chomp;
-               my %items;
-               $items{link}=[];
-               $items{dest}=[];
-               foreach my $i (split(/ /, $_)) {
-                       my ($item, $val)=split(/=/, $i, 2);
-                       push @{$items{$item}}, decode_entities($val);
-               }
-
-               next unless exists $items{src}; # skip bad lines for now
-
-               my $page=pagename($items{src}[0]);
+       if (! flock($wikilock, 2)) { # LOCK_EX
+               error("failed to get lock");
+       }
+       return 1;
+}
+
+sub unlockwiki () {
+       POSIX::close($ENV{IKIWIKI_CGILOCK_FD}) if exists $ENV{IKIWIKI_CGILOCK_FD};
+       return close($wikilock) if $wikilock;
+       return;
+}
+
+my $commitlock;
+
+sub commit_hook_enabled () {
+       open($commitlock, '+>', "$config{wikistatedir}/commitlock") ||
+               error("cannot write to $config{wikistatedir}/commitlock: $!");
+       if (! flock($commitlock, 1 | 4)) { # LOCK_SH | LOCK_NB to test
+               close($commitlock) || error("failed closing commitlock: $!");
+               return 0;
+       }
+       close($commitlock) || error("failed closing commitlock: $!");
+       return 1;
+}
+
+sub disable_commit_hook () {
+       open($commitlock, '>', "$config{wikistatedir}/commitlock") ||
+               error("cannot write to $config{wikistatedir}/commitlock: $!");
+       if (! flock($commitlock, 2)) { # LOCK_EX
+               error("failed to get commit lock");
+       }
+       return 1;
+}
+
+sub enable_commit_hook () {
+       return close($commitlock) if $commitlock;
+       return;
+}
+
+sub loadindex () {
+       %oldrenderedfiles=%pagectime=();
+       if (! $config{rebuild}) {
+               %pagesources=%pagemtime=%oldlinks=%links=%depends=
+               %destsources=%renderedfiles=%pagecase=%pagestate=
+               %depends_simple=();
+       }
+       my $in;
+       if (! open ($in, "<", "$config{wikistatedir}/indexdb")) {
+               if (-e "$config{wikistatedir}/index") {
+                       system("ikiwiki-transition", "indexdb", $config{srcdir});
+                       open ($in, "<", "$config{wikistatedir}/indexdb") || return;
+               }
+               else {
+                       return;
+               }
+       }
+
+       my $index=Storable::fd_retrieve($in);
+       if (! defined $index) {
+               return 0;
+       }
+
+       my $pages;
+       if (exists $index->{version} && ! ref $index->{version}) {
+               $pages=$index->{page};
+               %wikistate=%{$index->{state}};
+       }
+       else {
+               $pages=$index;
+               %wikistate=();
+       }
+
+       foreach my $src (keys %$pages) {
+               my $d=$pages->{$src};
+               my $page=pagename($src);
+               $pagectime{$page}=$d->{ctime};
                if (! $config{rebuild}) {
                if (! $config{rebuild}) {
-                       $pagesources{$page}=$items{src}[0];
-                       $oldpagemtime{$page}=$items{mtime}[0];
-                       $oldlinks{$page}=[@{$items{link}}];
-                       $links{$page}=[@{$items{link}}];
-                       $depends{$page}=$items{depends}[0] if exists $items{depends};
-                       $renderedfiles{$page}=[@{$items{dest}}];
-                       $oldrenderedfiles{$page}=[@{$items{dest}}];
-                       $pagecase{lc $page}=$page;
+                       $pagesources{$page}=$src;
+                       $pagemtime{$page}=$d->{mtime};
+                       $renderedfiles{$page}=$d->{dest};
+                       if (exists $d->{links} && ref $d->{links}) {
+                               $links{$page}=$d->{links};
+                               $oldlinks{$page}=[@{$d->{links}}];
+                       }
+                       if (ref $d->{depends_simple} eq 'ARRAY') {
+                               # old format
+                               $depends_simple{$page}={
+                                       map { $_ => 1 } @{$d->{depends_simple}}
+                               };
+                       }
+                       elsif (exists $d->{depends_simple}) {
+                               $depends_simple{$page}=$d->{depends_simple};
+                       }
+                       if (exists $d->{dependslist}) {
+                               # old format
+                               $depends{$page}={
+                                       map { $_ => $DEPEND_CONTENT }
+                                               @{$d->{dependslist}}
+                               };
+                       }
+                       elsif (exists $d->{depends} && ! ref $d->{depends}) {
+                               # old format
+                               $depends{$page}={$d->{depends} => $DEPEND_CONTENT };
+                       }
+                       elsif (exists $d->{depends}) {
+                               $depends{$page}=$d->{depends};
+                       }
+                       if (exists $d->{state}) {
+                               $pagestate{$page}=$d->{state};
+                       }
                }
                }
-               $pagectime{$page}=$items{ctime}[0];
+               $oldrenderedfiles{$page}=[@{$d->{dest}}];
        }
        }
-       close IN;
-} #}}}
+       foreach my $page (keys %pagesources) {
+               $pagecase{lc $page}=$page;
+       }
+       foreach my $page (keys %renderedfiles) {
+               $destsources{$_}=$page foreach @{$renderedfiles{$page}};
+       }
+       return close($in);
+}
 
 
-sub saveindex () { #{{{
+sub saveindex () {
        run_hooks(savestate => sub { shift->() });
 
        run_hooks(savestate => sub { shift->() });
 
+       my %hookids;
+       foreach my $type (keys %hooks) {
+               $hookids{$_}=1 foreach keys %{$hooks{$type}};
+       }
+       my @hookids=keys %hookids;
+
        if (! -d $config{wikistatedir}) {
                mkdir($config{wikistatedir});
        }
        if (! -d $config{wikistatedir}) {
                mkdir($config{wikistatedir});
        }
-       open (OUT, ">$config{wikistatedir}/index") || 
-               error("cannot write to $config{wikistatedir}/index: $!");
-       foreach my $page (keys %oldpagemtime) {
-               next unless $oldpagemtime{$page};
-               my $line="mtime=$oldpagemtime{$page} ".
-                       "ctime=$pagectime{$page} ".
-                       "src=$pagesources{$page}";
-               $line.=" dest=$_" foreach @{$renderedfiles{$page}};
-               my %count;
-               $line.=" link=$_" foreach grep { ++$count{$_} == 1 } @{$links{$page}};
+       my $newfile="$config{wikistatedir}/indexdb.new";
+       my $cleanup = sub { unlink($newfile) };
+       open (my $out, '>', $newfile) || error("cannot write to $newfile: $!", $cleanup);
+
+       my %index;
+       foreach my $page (keys %pagemtime) {
+               next unless $pagemtime{$page};
+               my $src=$pagesources{$page};
+
+               $index{page}{$src}={
+                       ctime => $pagectime{$page},
+                       mtime => $pagemtime{$page},
+                       dest => $renderedfiles{$page},
+                       links => $links{$page},
+               };
+
                if (exists $depends{$page}) {
                if (exists $depends{$page}) {
-                       $line.=" depends=".encode_entities($depends{$page}, " \t\n");
+                       $index{page}{$src}{depends} = $depends{$page};
+               }
+
+               if (exists $depends_simple{$page}) {
+                       $index{page}{$src}{depends_simple} = $depends_simple{$page};
+               }
+
+               if (exists $pagestate{$page}) {
+                       foreach my $id (@hookids) {
+                               foreach my $key (keys %{$pagestate{$page}{$id}}) {
+                                       $index{page}{$src}{state}{$id}{$key}=$pagestate{$page}{$id}{$key};
+                               }
+                       }
                }
                }
-               print OUT $line."\n";
        }
        }
-       close OUT;
-} #}}}
 
 
-sub template_params (@) { #{{{
-       my $filename=shift;
+       $index{state}={};
+       foreach my $id (@hookids) {
+               foreach my $key (keys %{$wikistate{$id}}) {
+                       $index{state}{$id}{$key}=$wikistate{$id}{$key};
+               }
+       }
        
        
-       require HTML::Template;
-       return filter => sub {
+       $index{version}="3";
+       my $ret=Storable::nstore_fd(\%index, $out);
+       return if ! defined $ret || ! $ret;
+       close $out || error("failed saving to $newfile: $!", $cleanup);
+       rename($newfile, "$config{wikistatedir}/indexdb") ||
+               error("failed renaming $newfile to $config{wikistatedir}/indexdb", $cleanup);
+       
+       return 1;
+}
+
+sub template_file ($) {
+       my $template=shift;
+
+       foreach my $dir ($config{templatedir}, @{$config{templatedirs}},
+                        "$installdir/share/ikiwiki/templates") {
+               return "$dir/$template" if -e "$dir/$template";
+       }
+       return;
+}
+
+sub template_params (@) {
+       my $filename=template_file(shift);
+
+       if (! defined $filename) {
+               return if wantarray;
+               return "";
+       }
+
+       my @ret=(
+               filter => sub {
                        my $text_ref = shift;
                        my $text_ref = shift;
-                       $$text_ref=&Encode::decode_utf8($$text_ref);
+                       ${$text_ref} = decode_utf8(${$text_ref});
                },
                },
-               filename => "$config{templatedir}/$filename",
+               filename => $filename,
                loop_context_vars => 1,
                die_on_bad_params => 0,
                loop_context_vars => 1,
                die_on_bad_params => 0,
-               @_;
-} #}}}
+               @_
+       );
+       return wantarray ? @ret : {@ret};
+}
 
 
-sub template ($;@) { #{{{
-       HTML::Template->new(template_params(@_));
-} #}}}
+sub template ($;@) {
+       require HTML::Template;
+       return HTML::Template->new(template_params(@_));
+}
 
 
-sub misctemplate ($$;@) { #{{{
+sub misctemplate ($$;@) {
        my $title=shift;
        my $pagebody=shift;
        
        my $title=shift;
        my $pagebody=shift;
        
@@ -642,209 +1682,564 @@ sub misctemplate ($$;@) { #{{{
                shift->(page => "", destpage => "", template => $template);
        });
        return $template->output;
                shift->(page => "", destpage => "", template => $template);
        });
        return $template->output;
-}#}}}
+}
 
 
-sub hook (@) { # {{{
+sub hook (@) {
        my %param=@_;
        
        if (! exists $param{type} || ! ref $param{call} || ! exists $param{id}) {
        my %param=@_;
        
        if (! exists $param{type} || ! ref $param{call} || ! exists $param{id}) {
-               error "hook requires type, call, and id parameters";
+               error 'hook requires type, call, and id parameters';
        }
 
        return if $param{no_override} && exists $hooks{$param{type}}{$param{id}};
        
        $hooks{$param{type}}{$param{id}}=\%param;
        }
 
        return if $param{no_override} && exists $hooks{$param{type}}{$param{id}};
        
        $hooks{$param{type}}{$param{id}}=\%param;
-} # }}}
+       return 1;
+}
 
 
-sub run_hooks ($$) { # {{{
+sub run_hooks ($$) {
        # Calls the given sub for each hook of the given type,
        # passing it the hook function to call.
        my $type=shift;
        my $sub=shift;
 
        if (exists $hooks{$type}) {
        # Calls the given sub for each hook of the given type,
        # passing it the hook function to call.
        my $type=shift;
        my $sub=shift;
 
        if (exists $hooks{$type}) {
-               my @deferred;
+               my (@first, @middle, @last);
                foreach my $id (keys %{$hooks{$type}}) {
                foreach my $id (keys %{$hooks{$type}}) {
-                       if ($hooks{$type}{$id}{last}) {
-                               push @deferred, $id;
-                               next;
+                       if ($hooks{$type}{$id}{first}) {
+                               push @first, $id;
+                       }
+                       elsif ($hooks{$type}{$id}{last}) {
+                               push @last, $id;
+                       }
+                       else {
+                               push @middle, $id;
                        }
                        }
-                       $sub->($hooks{$type}{$id}{call});
                }
                }
-               foreach my $id (@deferred) {
+               foreach my $id (@first, @middle, @last) {
                        $sub->($hooks{$type}{$id}{call});
                }
        }
                        $sub->($hooks{$type}{$id}{call});
                }
        }
-} #}}}
 
 
-sub globlist_to_pagespec ($) { #{{{
-       my @globlist=split(' ', shift);
+       return 1;
+}
+
+sub rcs_update () {
+       $hooks{rcs}{rcs_update}{call}->(@_);
+}
+
+sub rcs_prepedit ($) {
+       $hooks{rcs}{rcs_prepedit}{call}->(@_);
+}
+
+sub rcs_commit ($$$;$$) {
+       $hooks{rcs}{rcs_commit}{call}->(@_);
+}
 
 
-       my (@spec, @skip);
-       foreach my $glob (@globlist) {
-               if ($glob=~/^!(.*)/) {
-                       push @skip, $glob;
+sub rcs_commit_staged ($$$) {
+       $hooks{rcs}{rcs_commit_staged}{call}->(@_);
+}
+
+sub rcs_add ($) {
+       $hooks{rcs}{rcs_add}{call}->(@_);
+}
+
+sub rcs_remove ($) {
+       $hooks{rcs}{rcs_remove}{call}->(@_);
+}
+
+sub rcs_rename ($$) {
+       $hooks{rcs}{rcs_rename}{call}->(@_);
+}
+
+sub rcs_recentchanges ($) {
+       $hooks{rcs}{rcs_recentchanges}{call}->(@_);
+}
+
+sub rcs_diff ($) {
+       $hooks{rcs}{rcs_diff}{call}->(@_);
+}
+
+sub rcs_getctime ($) {
+       $hooks{rcs}{rcs_getctime}{call}->(@_);
+}
+
+sub rcs_receive () {
+       $hooks{rcs}{rcs_receive}{call}->();
+}
+
+sub add_depends ($$;@) {
+       my $page=shift;
+       my $pagespec=shift;
+
+       # Is the pagespec a simple page name?
+       my $simple=$pagespec =~ /$config{wiki_file_regexp}/ &&
+               $pagespec !~ /[\s*?()!]/;
+
+       my $deptype=0;
+       if (@_) {
+               my %params=@_;
+               
+               if ($params{presence}) {
+                       # Is the pagespec limited to terms that will continue
+                       # to match pages as long as those pages exist?
+                       my $presence_limited=1;
+                       while ($presence_limited && $pagespec=~m/(\w+)\([^\)]*\)/g) {
+                               $presence_limited = $1 =~ /^(glob|internal|creation_month|creation_day|creation_year|created_before|created_after)$/;
+                       }
+                       if ($presence_limited) {
+                               $deptype=$deptype | $DEPEND_PRESENCE;
+                       }
+                       else {
+                               $deptype=$deptype | $DEPEND_CONTENT;
+                       }
                }
                }
-               else {
-                       push @spec, $glob;
+               if ($params{links}) {
+                       # Is the pagespec limited to terms that will continue
+                       # to match pages as long as those pages exist and
+                       # link to the same places?
+                       my $links_limited=1;
+                       while ($links_limited && $pagespec=~m/(\w+)\([^\)]*\)/g) {
+                               $links_limited = $1 =~ /^(glob|internal|creation_month|creation_day|creation_year|created_before|created_after|backlink)$/;
+                       }
+                       if ($links_limited) {
+                               $deptype=$deptype | $DEPEND_LINKS;
+                       }
+                       else {
+                               $deptype=$deptype | $DEPEND_CONTENT;
+                       }
                }
        }
                }
        }
+       $deptype=$DEPEND_CONTENT unless $deptype;
 
 
-       my $spec=join(" or ", @spec);
-       if (@skip) {
-               my $skip=join(" and ", @skip);
-               if (length $spec) {
-                       $spec="$skip and ($spec)";
-               }
-               else {
-                       $spec=$skip;
-               }
+       if ($simple) {
+               $depends_simple{$page}{lc $pagespec} |= $deptype;
+               return 1;
        }
        }
-       return $spec;
-} #}}}
 
 
-sub is_globlist ($) { #{{{
-       my $s=shift;
-       $s=~/[^\s]+\s+([^\s]+)/ && $1 ne "and" && $1 ne "or";
-} #}}}
+       return unless pagespec_valid($pagespec);
 
 
-sub safequote ($) { #{{{
-       my $s=shift;
-       $s=~s/[{}]//g;
-       return "q{$s}";
-} #}}}
+       $depends{$page}{$pagespec} |= $deptype;
+       return 1;
+}
 
 
-sub pagespec_merge ($$) { #{{{
-       my $a=shift;
-       my $b=shift;
+sub file_pruned ($$) {
+       require File::Spec;
+       my $file=File::Spec->canonpath(shift);
+       my $base=File::Spec->canonpath(shift);
+       $file =~ s#^\Q$base\E/+##;
+
+       my $regexp='('.join('|', @{$config{wiki_file_prune_regexps}}).')';
+       return $file =~ m/$regexp/ && $file ne $base;
+}
+
+sub define_gettext () {
+       # If translation is needed, redefine the gettext function to do it.
+       # Otherwise, it becomes a quick no-op.
+       no warnings 'redefine';
+       if ((exists $ENV{LANG} && length $ENV{LANG}) ||
+           (exists $ENV{LC_ALL} && length $ENV{LC_ALL}) ||
+           (exists $ENV{LC_MESSAGES} && length $ENV{LC_MESSAGES})) {
+               *gettext=sub {
+                       my $gettext_obj=eval q{
+                               use Locale::gettext q{textdomain};
+                               Locale::gettext->domain('ikiwiki')
+                       };
+
+                       if ($gettext_obj) {
+                               $gettext_obj->get(shift);
+                       }
+                       else {
+                               return shift;
+                       }
+               };
+       }
+       else {
+               *gettext=sub { return shift };
+       }
+}
 
 
-       return $a if $a eq $b;
+sub gettext {
+       define_gettext();
+       gettext(@_);
+}
 
 
-        # Support for old-style GlobLists.
-        if (is_globlist($a)) {
-                $a=globlist_to_pagespec($a);
-        }
-        if (is_globlist($b)) {
-                $b=globlist_to_pagespec($b);
-        }
+sub yesno ($) {
+       my $val=shift;
 
 
-       return "($a) or ($b)";
-} #}}}
+       return (defined $val && (lc($val) eq gettext("yes") || lc($val) eq "yes" || $val eq "1"));
+}
 
 
-sub pagespec_translate ($) { #{{{
-       # This assumes that $page is in scope in the function
-       # that evalulates the translated pagespec code.
-       my $spec=shift;
+sub inject {
+       # Injects a new function into the symbol table to replace an
+       # exported function.
+       my %params=@_;
 
 
-       # Support for old-style GlobLists.
-       if (is_globlist($spec)) {
-               $spec=globlist_to_pagespec($spec);
+       # This is deep ugly perl foo, beware.
+       no strict;
+       no warnings;
+       if (! defined $params{parent}) {
+               $params{parent}='::';
+               $params{old}=\&{$params{name}};
+               $params{name}=~s/.*:://;
+       }
+       my $parent=$params{parent};
+       foreach my $ns (grep /^\w+::/, keys %{$parent}) {
+               $ns = $params{parent} . $ns;
+               inject(%params, parent => $ns) unless $ns eq '::main::';
+               *{$ns . $params{name}} = $params{call}
+                       if exists ${$ns}{$params{name}} &&
+                          \&{${$ns}{$params{name}}} == $params{old};
        }
        }
+       use strict;
+       use warnings;
+}
+
+sub add_link ($$) {
+       my $page=shift;
+       my $link=shift;
+
+       push @{$links{$page}}, $link
+               unless grep { $_ eq $link } @{$links{$page}};
+}
+
+sub pagespec_translate ($) {
+       my $spec=shift;
 
        # Convert spec to perl code.
        my $code="";
 
        # Convert spec to perl code.
        my $code="";
-       while ($spec=~m/\s*(\!|\(|\)|\w+\([^\)]+\)|[^\s()]+)\s*/ig) {
+       my @data;
+       while ($spec=~m{
+               \s*             # ignore whitespace
+               (               # 1: match a single word
+                       \!              # !
+               |
+                       \(              # (
+               |
+                       \)              # )
+               |
+                       \w+\([^\)]*\)   # command(params)
+               |
+                       [^\s()]+        # any other text
+               )
+               \s*             # ignore whitespace
+       }gx) {
                my $word=$1;
                my $word=$1;
-               if (lc $word eq "and") {
-                       $code.=" &&";
+               if (lc $word eq 'and') {
+                       $code.=' &&';
                }
                }
-               elsif (lc $word eq "or") {
-                       $code.=" ||";
+               elsif (lc $word eq 'or') {
+                       $code.=' ||';
                }
                elsif ($word eq "(" || $word eq ")" || $word eq "!") {
                }
                elsif ($word eq "(" || $word eq ")" || $word eq "!") {
-                       $code.=" ".$word;
+                       $code.=' '.$word;
                }
                }
-               elsif ($word =~ /^(link|backlink|created_before|created_after|creation_month|creation_year|creation_day)\((.+)\)$/) {
-                       $code.=" match_$1(\$page, ".safequote($2).")";
+               elsif ($word =~ /^(\w+)\((.*)\)$/) {
+                       if (exists $IkiWiki::PageSpec::{"match_$1"}) {
+                               push @data, $2;
+                               $code.="IkiWiki::PageSpec::match_$1(\$page, \$data[$#data], \@_)";
+                       }
+                       else {
+                               push @data, qq{unknown function in pagespec "$word"};
+                               $code.="IkiWiki::ErrorReason->new(\$data[$#data])";
+                       }
                }
                else {
                }
                else {
-                       $code.=" match_glob(\$page, ".safequote($word).")";
+                       push @data, $word;
+                       $code.=" IkiWiki::PageSpec::match_glob(\$page, \$data[$#data], \@_)";
                }
        }
 
                }
        }
 
-       return $code;
-} #}}}
+       if (! length $code) {
+               $code="IkiWiki::FailReason->new('empty pagespec')";
+       }
+
+       no warnings;
+       return eval 'sub { my $page=shift; '.$code.' }';
+}
 
 
-sub add_depends ($$) { #{{{
+sub pagespec_match ($$;@) {
        my $page=shift;
        my $page=shift;
-       my $pagespec=shift;
+       my $spec=shift;
+       my @params=@_;
+
+       # Backwards compatability with old calling convention.
+       if (@params == 1) {
+               unshift @params, 'location';
+       }
+
+       my $sub=pagespec_translate($spec);
+       return IkiWiki::ErrorReason->new("syntax error in pagespec \"$spec\"")
+               if $@ || ! defined $sub;
+       return $sub->($page, @params);
+}
+
+sub pagespec_match_list ($$;@) {
+       my $pages=shift;
+       my $spec=shift;
+       my @params=@_;
+
+       my $sub=pagespec_translate($spec);
+       error "syntax error in pagespec \"$spec\""
+               if $@ || ! defined $sub;
        
        
-       if (! exists $depends{$page}) {
-               $depends{$page}=$pagespec;
+       my @ret;
+       my $r;
+       foreach my $page (@$pages) {
+               $r=$sub->($page, @params);
+               push @ret, $page if $r;
+       }
+
+       if (! @ret && defined $r && $r->isa("IkiWiki::ErrorReason")) {
+               error(sprintf(gettext("cannot match pages: %s"), $r));
        }
        else {
        }
        else {
-               $depends{$page}=pagespec_merge($depends{$page}, $pagespec);
+               return @ret;
        }
        }
-} # }}}
+}
 
 
-sub pagespec_match ($$) { #{{{
-       my $page=shift;
+sub pagespec_valid ($) {
        my $spec=shift;
 
        my $spec=shift;
 
-       return eval pagespec_translate($spec);
-} #}}}
+       my $sub=pagespec_translate($spec);
+       return ! $@;
+}
+
+sub glob2re ($) {
+       my $re=quotemeta(shift);
+       $re=~s/\\\*/.*/g;
+       $re=~s/\\\?/./g;
+       return $re;
+}
+
+package IkiWiki::FailReason;
+
+use overload (
+       '""'    => sub { ${$_[0]} },
+       '0+'    => sub { 0 },
+       '!'     => sub { bless $_[0], 'IkiWiki::SuccessReason'},
+       fallback => 1,
+);
+
+sub new {
+       my $class = shift;
+       my $value = shift;
+       return bless \$value, $class;
+}
+
+package IkiWiki::ErrorReason;
+
+our @ISA = 'IkiWiki::FailReason';
+
+package IkiWiki::SuccessReason;
+
+use overload (
+       '""'    => sub { ${$_[0]} },
+       '0+'    => sub { 1 },
+       '!'     => sub { bless $_[0], 'IkiWiki::FailReason'},
+       fallback => 1,
+);
+
+sub new {
+       my $class = shift;
+       my $value = shift;
+       return bless \$value, $class;
+};
+
+package IkiWiki::PageSpec;
+
+sub derel ($$) {
+       my $path=shift;
+       my $from=shift;
+
+       if ($path =~ m!^\./!) {
+               $from=~s#/?[^/]+$## if defined $from;
+               $path=~s#^\./##;
+               $path="$from/$path" if length $from;
+       }
+
+       return $path;
+}
 
 
-sub match_glob ($$) { #{{{
+sub match_glob ($$;@) {
        my $page=shift;
        my $glob=shift;
        my $page=shift;
        my $glob=shift;
+       my %params=@_;
+       
+       $glob=derel($glob, $params{location});
 
 
-       # turn glob into safe regexp
-       $glob=quotemeta($glob);
-       $glob=~s/\\\*/.*/g;
-       $glob=~s/\\\?/./g;
+       my $regexp=IkiWiki::glob2re($glob);
+       if ($page=~/^$regexp$/i) {
+               if (! IkiWiki::isinternal($page) || $params{internal}) {
+                       return IkiWiki::SuccessReason->new("$glob matches $page");
+               }
+               else {
+                       return IkiWiki::FailReason->new("$glob matches $page, but the page is an internal page");
+               }
+       }
+       else {
+               return IkiWiki::FailReason->new("$glob does not match $page");
+       }
+}
 
 
-       return $page=~/^$glob$/i;
-} #}}}
+sub match_internal ($$;@) {
+       return match_glob($_[0], $_[1], @_, internal => 1)
+}
 
 
-sub match_link ($$) { #{{{
+sub match_link ($$;@) {
        my $page=shift;
        my $link=lc(shift);
        my $page=shift;
        my $link=lc(shift);
+       my %params=@_;
+
+       $link=derel($link, $params{location});
+       my $from=exists $params{location} ? $params{location} : '';
 
 
-       my $links = $links{$page} or return undef;
-       foreach my $p (@$links) {
-               return 1 if lc $p eq $link;
+       my $links = $IkiWiki::links{$page};
+       return IkiWiki::FailReason->new("$page has no links") unless $links && @{$links};
+       my $bestlink = IkiWiki::bestlink($from, $link);
+       foreach my $p (@{$links}) {
+               if (length $bestlink) {
+                       return IkiWiki::SuccessReason->new("$page links to $link")
+                               if $bestlink eq IkiWiki::bestlink($page, $p);
+               }
+               else {
+                       return IkiWiki::SuccessReason->new("$page links to page $p matching $link")
+                               if match_glob($p, $link, %params);
+                       my ($p_rel)=$p=~/^\/?(.*)/;
+                       $link=~s/^\///;
+                       return IkiWiki::SuccessReason->new("$page links to page $p_rel matching $link")
+                               if match_glob($p_rel, $link, %params);
+               }
        }
        }
-       return 0;
-} #}}}
+       return IkiWiki::FailReason->new("$page does not link to $link");
+}
 
 
-sub match_backlink ($$) { #{{{
-       match_link(pop, pop);
-} #}}}
+sub match_backlink ($$;@) {
+       return match_link($_[1], $_[0], @_);
+}
 
 
-sub match_created_before ($$) { #{{{
+sub match_created_before ($$;@) {
        my $page=shift;
        my $testpage=shift;
        my $page=shift;
        my $testpage=shift;
+       my %params=@_;
+       
+       $testpage=derel($testpage, $params{location});
 
 
-       if (exists $pagectime{$testpage}) {
-               return $pagectime{$page} < $pagectime{$testpage};
+       if (exists $IkiWiki::pagectime{$testpage}) {
+               if ($IkiWiki::pagectime{$page} < $IkiWiki::pagectime{$testpage}) {
+                       return IkiWiki::SuccessReason->new("$page created before $testpage");
+               }
+               else {
+                       return IkiWiki::FailReason->new("$page not created before $testpage");
+               }
        }
        else {
        }
        else {
-               return 0;
+               return IkiWiki::ErrorReason->new("$testpage does not exist");
        }
        }
-} #}}}
+}
 
 
-sub match_created_after ($$) { #{{{
+sub match_created_after ($$;@) {
        my $page=shift;
        my $testpage=shift;
        my $page=shift;
        my $testpage=shift;
+       my %params=@_;
+       
+       $testpage=derel($testpage, $params{location});
 
 
-       if (exists $pagectime{$testpage}) {
-               return $pagectime{$page} > $pagectime{$testpage};
+       if (exists $IkiWiki::pagectime{$testpage}) {
+               if ($IkiWiki::pagectime{$page} > $IkiWiki::pagectime{$testpage}) {
+                       return IkiWiki::SuccessReason->new("$page created after $testpage");
+               }
+               else {
+                       return IkiWiki::FailReason->new("$page not created after $testpage");
+               }
        }
        else {
        }
        else {
-               return 0;
+               return IkiWiki::ErrorReason->new("$testpage does not exist");
        }
        }
-} #}}}
+}
 
 
-sub match_creation_day ($$) { #{{{
-       return ((gmtime($pagectime{shift()}))[3] == shift);
-} #}}}
+sub match_creation_day ($$;@) {
+       if ((gmtime($IkiWiki::pagectime{shift()}))[3] == shift) {
+               return IkiWiki::SuccessReason->new('creation_day matched');
+       }
+       else {
+               return IkiWiki::FailReason->new('creation_day did not match');
+       }
+}
 
 
-sub match_creation_month ($$) { #{{{
-       return ((gmtime($pagectime{shift()}))[4] + 1 == shift);
-} #}}}
+sub match_creation_month ($$;@) {
+       if ((gmtime($IkiWiki::pagectime{shift()}))[4] + 1 == shift) {
+               return IkiWiki::SuccessReason->new('creation_month matched');
+       }
+       else {
+               return IkiWiki::FailReason->new('creation_month did not match');
+       }
+}
 
 
-sub match_creation_year ($$) { #{{{
-       return ((gmtime($pagectime{shift()}))[5] + 1900 == shift);
-} #}}}
+sub match_creation_year ($$;@) {
+       if ((gmtime($IkiWiki::pagectime{shift()}))[5] + 1900 == shift) {
+               return IkiWiki::SuccessReason->new('creation_year matched');
+       }
+       else {
+               return IkiWiki::FailReason->new('creation_year did not match');
+       }
+}
+
+sub match_user ($$;@) {
+       shift;
+       my $user=shift;
+       my %params=@_;
+       
+       if (! exists $params{user}) {
+               return IkiWiki::ErrorReason->new("no user specified");
+       }
+
+       if (defined $params{user} && lc $params{user} eq lc $user) {
+               return IkiWiki::SuccessReason->new("user is $user");
+       }
+       elsif (! defined $params{user}) {
+               return IkiWiki::FailReason->new("not logged in");
+       }
+       else {
+               return IkiWiki::FailReason->new("user is $params{user}, not $user");
+       }
+}
+
+sub match_admin ($$;@) {
+       shift;
+       shift;
+       my %params=@_;
+       
+       if (! exists $params{user}) {
+               return IkiWiki::ErrorReason->new("no user specified");
+       }
+
+       if (defined $params{user} && IkiWiki::is_admin($params{user})) {
+               return IkiWiki::SuccessReason->new("user is an admin");
+       }
+       elsif (! defined $params{user}) {
+               return IkiWiki::FailReason->new("not logged in");
+       }
+       else {
+               return IkiWiki::FailReason->new("user is not an admin");
+       }
+}
+
+sub match_ip ($$;@) {
+       shift;
+       my $ip=shift;
+       my %params=@_;
+       
+       if (! exists $params{ip}) {
+               return IkiWiki::ErrorReason->new("no IP specified");
+       }
+
+       if (defined $params{ip} && lc $params{ip} eq lc $ip) {
+               return IkiWiki::SuccessReason->new("IP is $ip");
+       }
+       else {
+               return IkiWiki::FailReason->new("IP is $params{ip}, not $ip");
+       }
+}
 
 1
 
 1