path: root/IkiWiki.pm

#!/usr/bin/perl

package IkiWiki;
use warnings;
use strict;
use Encode;
use HTML::Entities;
use open qw{:utf8 :std};

use vars qw{%config %links %oldlinks %oldpagemtime %pagectime %pagecase
            %renderedfiles %oldrenderedfiles %pagesources %depends %hooks
        %forcerebuild};

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

# Optimisation.
use Memoize;
memoize("abs2rel");
memoize("pagespec_translate");
memoize("file_pruned");

my $installdir=''; # INSTALLDIR_AUTOREPLACE done by Makefile, DNE
our $version='unknown'; # VERSION_AUTOREPLACE done by Makefile, DNE

sub defaultconfig () { #{{{
    wiki_file_prune_regexps => [qr/\.\./, qr/^\./, qr/\/\./, qr/\.x?html?$/,
        qr/(^|\/).svn\//, qr/.arch-ids\//, qr/{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 => '',
    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,
    userdir => "",
} #}}}
   
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 $config{locale}) {
        eval q{use POSIX};
        error($@) if $@;
        $ENV{LANG} = $config{locale}
            if POSIX::setlocale(&POSIX::LC_TIME, $config{locale});
    }

    if ($config{w3mmode}) {
        eval q{use Cwd q{abs_path}};
        error($@) if $@;
        $config{srcdir}=possibly_foolish_untaint(abs_path($config{srcdir}));
        $config{destdir}=possibly_foolish_untaint(abs_path($config{destdir}));
        $config{cgiurl}="file:///\$LIB/ikiwiki-w3m.cgi/".$config{cgiurl}
            unless $config{cgiurl} =~ m!file:///!;
        $config{url}="file://".$config{destdir};
    }

    if ($config{cgi} && ! length $config{url}) {
        error("Must specify url to wiki with --url when using --cgi\n");
    }
    
    $config{wikistatedir}="$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}: $@");
        }
    }
    else {
        require IkiWiki::Rcs::Stub;
    }

    run_hooks(checkconfig => sub { shift->() });
} #}}}

sub loadplugins () { #{{{
    loadplugin($_) foreach @{$config{plugin}};
    
    run_hooks(getopt => sub { shift->() });
    if (grep /^-/, @ARGV) {
        print STDERR "Unknown option: $_\n"
            foreach grep /^-/, @ARGV;
        usage();
    }
} #}}}

sub loadplugin ($) { #{{{
    my $plugin=shift;

    my $mod="IkiWiki::Plugin::".possibly_foolish_untaint($plugin);
    eval qq{use $mod};
    if ($@) {
        error("Failed to load plugin $mod: $@");
    }
} #}}}

sub error ($) { #{{{
    if ($config{cgi}) {
        print "Content-type: text/html\n\n";
        print misctemplate("Error", "<p>Error: @_</p>");
    }
    log_message(error => @_);
    exit(1);
} #}}}

sub debug ($) { #{{{
    return unless $config{verbose};
    log_message(debug => @_);
} #}}}

my $log_open=0;
sub log_message ($$) { #{{{
    my $type=shift;

    if ($config{syslog}) {
        require Sys::Syslog;
        unless ($log_open) {
            Sys::Syslog::setlogsock('unix');
            Sys::Syslog::openlog('ikiwiki', '', 'user');
            $log_open=1;
        }
        eval {
            Sys::Syslog::syslog($type, join(" ", @_));
        }
    }
    elsif (! $config{cgi}) {
        print "@_\n";
    }
    else {
        print STDERR "@_\n";
    }
} #}}}

sub possibly_foolish_untaint ($) { #{{{
    my $tainted=shift;
    my ($untainted)=$tainted=~/(.*)/;
    return $untainted;
} #}}}

sub basename ($) { #{{{
    my $file=shift;

    $file=~s!.*/+!!;
    return $file;
} #}}}

sub dirname ($) { #{{{
    my $file=shift;

    $file=~s!/*[^/]+$!!;
    return $file;
} #}}}

sub pagetype ($) { #{{{
    my $page=shift;
    
    if ($page =~ /\.([^.]+)$/) {
        return $1 if exists $hooks{htmlize}{$1};
    }
    return undef;
} #}}}

sub pagename ($) { #{{{
    my $file=shift;

    my $type=pagetype($file);
    my $page=$file;
    $page=~s/\Q.$type\E*$// if defined $type;
    return $page;
} #}}}

sub htmlpage ($) { #{{{
    my $page=shift;

    return $page.".html";
} #}}}

sub srcfile ($) { #{{{
    my $file=shift;

    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");
} #}}}

sub readfile ($;$) { #{{{
    my $file=shift;
    my $binary=shift;

    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;
    return $ret;
} #}}}

sub writefile ($$$;$) { #{{{
    my $file=shift; # can include subdirs
    my $destdir=shift; # directory to put file in
    my $content=shift;
    my $binary=shift;
    
    my $test=$file;
    while (length $test) {
        if (-l "$destdir/$test") {
            error("cannot write to a symlink ($test)");
        }
        $test=dirname($test);
    }

    my $dir=dirname("$destdir/$file");
    if (! -d $dir) {
        my $d="";
        foreach my $s (split(m!/+!, $dir)) {
            $d.="$s/";
            if (! -d $d) {
                mkdir($d) || error("failed to create directory $d: $!");
            }
        }
    }
    
    open (OUT, ">$destdir/$file") || error("failed to write $destdir/$file: $!");
    binmode(OUT) if ($binary);
    print OUT $content;
    close OUT;
} #}}}

my %cleared;
sub will_render ($$;$) { #{{{
    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{$page}})) {
        error("$config{destdir}/$dest independently created, not overwriting with version from $page");
    }

    if (! $clear || $cleared{$page}) {
        $renderedfiles{$page}=[$dest, grep { $_ ne $dest } @{$renderedfiles{$page}}];
    }
    else {
        $renderedfiles{$page}=[$dest];
        $cleared{$page}=1;
    }
} #}}}

sub bestlink ($$) { #{{{
    my $page=shift;
    my $link=shift;
    
    my $cwd=$page;
    if ($link=~s/^\/+//) {
        # absolute links
        $cwd="";
    }

    do {
        my $l=$cwd;
        $l.="/" if length $l;
        $l.=$link;

        if (exists $links{$l}) {
            return $l;
        }
        elsif (exists $pagecase{lc $l}) {
            return $pagecase{lc $l};
        }
    } while $cwd=~s!/?[^/]+$!!;

    #print STDERR "warning: page $page, broken link: $link\n";
    return "";
} #}}}

sub isinlinableimage ($) { #{{{
    my $file=shift;
    
    $file=~/\.(png|gif|jpg|jpeg)$/i;
} #}}}

sub pagetitle ($;$) { #{{{
    my $page=shift;
    my $unescaped=shift;

    if ($unescaped) {
        $page=~s/__(\d+)__/chr($1)/eg;
    }
    else {
        $page=~s/__(\d+)__/&#$1;/g;
    }
    $page=~y/_/ /;

    return $page;
} #}}}

sub titlepage ($) { #{{{
    my $title=shift;
    $title=~y/ /_/;
    $title=~s/([^-[:alnum:]_:+\/.])/"__".ord($1)."__"/eg;
    return $title;
} #}}}

sub cgiurl (@) { #{{{
    my %params=@_;

    return $config{cgiurl}."?".join("&amp;", map "$_=$params{$_}", keys %params);
} #}}}

sub baseurl (;$) { #{{{
    my $page=shift;

    return "$config{url}/" if ! defined $page;
    
    $page=~s/[^\/]+$//;
    $page=~s/[^\/]+\//..\//g;
    return $page;
} #}}}

sub abs2rel ($$) { #{{{
    # 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; fixed in debian unstable now)
    my $path="/".shift;
    my $base="/".shift;

    require File::Spec;
    my $ret=File::Spec->abs2rel($path, $base);
    $ret=~s/^// if defined $ret;
    return $ret;
} #}}}

sub displaytime ($) { #{{{
    my $time=shift;

    eval q{use POSIX};
    error($@) if $@;
    # 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)));
} #}}}

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 $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 $bestlink;
    if (! $forcesubpage) {
        $bestlink=bestlink($lpage, $link);
    }
    else {
        $bestlink="$lpage/".lc($link);
    }

    $linktext=pagetitle(basename($link)) unless defined $linktext;
    
    return "<span class=\"selflink\">$linktext</span>"
        if length $bestlink && $page eq $bestlink;
    
    if (! grep { $_ eq $bestlink } map { @{$_} } values %renderedfiles) {
        $bestlink=htmlpage($bestlink);
    }
    if (! grep { $_ eq $bestlink } map { @{$_} } values %renderedfiles) {
        return $linktext unless length $config{cgiurl};
        return "<span><a href=\"".
            cgiurl(do => "create", page => lc($link), from => $page).
            "\">?</a>$linktext</span>"
    }
    
    $bestlink=abs2rel($bestlink, dirname($page));
    
    if (! $noimageinline && isinlinableimage($bestlink)) {
        return "<img src=\"$bestlink\" alt=\"$linktext\" />";
    }
    return "<a href=\"$bestlink\">$linktext</a>";
} #}}}

sub htmlize ($$$) { #{{{
    my $page=shift;
    my $type=shift;
    my $content=shift;

    if (exists $hooks{htmlize}{$type}) {
        $content=$hooks{htmlize}{$type}{call}->(
            page => $page,
            content => $content,
        );
    }
    else {
        error("htmlization of $type not supported");
    }

    run_hooks(sanitize => sub {
        $content=shift->(
            page => $page,
            content => $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)
    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;
    
    return $content;
} #}}}

my %preprocessing;
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 $handle=sub {
        my $escape=shift;
        my $command=shift;
        my $params=shift;
        if (length $escape) {
            return "[[$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;
            while ($params =~ /(?:(\w+)=)?(?:"""(.*?)"""|"([^"]+)"|(\S+))(?:\s+|$)/sg) {
                my $key=$1;
                my $val;
                if (defined $2) {
                    $val=$2;
                    $val=~s/\r\n/\n/mg;
                    $val=~s/^\n+//g;
                    $val=~s/\n+$//g;
                }
                elsif (defined $3) {
                    $val=$3;
                }
                elsif (defined $4) {
                    $val=$4;
                }

                if (defined $key) {
                    push @params, $key, $val;
                }
                else {
                    push @params, $val, '';
                }
            }
            if ($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}]]";
            }
            my $ret=$hooks{preprocess}{$command}{call}->(
                @params,
                page => $page,
                destpage => $destpage,
            );
            $preprocessing{$page}--;
            return $ret;
        }
        else {
            return "[[$command $params]]";
        }
    };
    
    $content =~ s{(\\?)\[\[(\w+)\s+((?:(?:\w+=)?(?:""".*?"""|"[^"]+"|[^\s\]]+)\s*)*)\]\]}{$handle->($1, $2, $3)}seg;
    return $content;
} #}}}

sub filter ($$) { #{{{
    my $page=shift;
    my $content=shift;

    run_hooks(filter => sub {
        $content=shift->(page => $page, content => $content);
    });

    return $content;
} #}}}

sub indexlink () { #{{{
    return "<a href=\"$config{url}\">$config{wikiname}</a>";
} #}}}

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});
    }
    open(WIKILOCK, ">$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 (! $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;
        }
        $pagectime{$page}=$items{ctime}[0];
    }
    close IN;
} #}}}

sub saveindex () { #{{{
    run_hooks(savestate => sub { shift->() });

    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}};
        if (exists $depends{$page}) {
            $line.=" depends=".encode_entities($depends{$page}, " \t\n");
        }
        print OUT $line."\n";
    }
    close OUT;
} #}}}

sub template_params (@) { #{{{
    my $filename=shift;
    
    require HTML::Template;
    return filter => sub {
            my $text_ref = shift;
            $$text_ref=&Encode::decode_utf8($$text_ref);
        },
        filename => "$config{templatedir}/$filename",
        loop_context_vars => 1,
        die_on_bad_params => 0,
        @_;
} #}}}

sub template ($;@) { #{{{
    HTML::Template->new(template_params(@_));
} #}}}

sub misctemplate ($$;@) { #{{{
    my $title=shift;
    my $pagebody=shift;
    
    my $template=template("misc.tmpl");
    $template->param(
        title => $title,
        indexlink => indexlink(),
        wikiname => $config{wikiname},
        pagebody => $pagebody,
        baseurl => baseurl(),
        @_,
    );
    run_hooks(pagetemplate => sub {
        shift->(page => "", destpage => "", template => $template);
    });
    return $template->output;
}#}}}

sub hook (@) { # {{{
    my %param=@_;
    
    if (! exists $param{type} || ! ref $param{call} || ! exists $param{id}) {
        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;
} # }}}

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}) {
        my @deferred;
        foreach my $id (keys %{$hooks{$type}}) {
            if ($hooks{$type}{$id}{last}) {
                push @deferred, $id;
                next;
            }
            $sub->($hooks{$type}{$id}{call});
        }
        foreach my $id (@deferred) {
            $sub->($hooks{$type}{$id}{call});
        }
    }
} #}}}

sub globlist_to_pagespec ($) { #{{{
    my @globlist=split(' ', shift);

    my (@spec, @skip);
    foreach my $glob (@globlist) {
        if ($glob=~/^!(.*)/) {
            push @skip, $glob;
        }
        else {
            push @spec, $glob;
        }
    }

    my $spec=join(" or ", @spec);
    if (@skip) {
        my $skip=join(" and ", @skip);
        if (length $spec) {
            $spec="$skip and ($spec)";
        }
        else {
            $spec=$skip;
        }
    }
    return $spec;
} #}}}

sub is_globlist ($) { #{{{
    my $s=shift;
    $s=~/[^\s]+\s+([^\s]+)/ && $1 ne "and" && $1 ne "or";
} #}}}

sub safequote ($) { #{{{
    my $s=shift;
    $s=~s/[{}]//g;
    return "q{$s}";
} #}}}

sub pagespec_merge ($$) { #{{{
    my $a=shift;
    my $b=shift;

    return $a if $a eq $b;

        # Support for old-style GlobLists.
        if (is_globlist($a)) {
                $a=globlist_to_pagespec($a);
        }
        if (is_globlist($b)) {
                $b=globlist_to_pagespec($b);
        }

    return "($a) or ($b)";
} #}}}

sub pagespec_translate ($) { #{{{
    # This assumes that $page is in scope in the function
    # that evalulates the translated pagespec code.
    my $spec=shift;

    # Support for old-style GlobLists.
    if (is_globlist($spec)) {
        $spec=globlist_to_pagespec($spec);
    }

    # Convert spec to perl code.
    my $code="";
    while ($spec=~m/\s*(\!|\(|\)|\w+\([^\)]+\)|[^\s()]+)\s*/ig) {
        my $word=$1;
        if (lc $word eq "and") {
            $code.=" &&";
        }
        elsif (lc $word eq "or") {
            $code.=" ||";
        }
        elsif ($word eq "(" || $word eq ")" || $word eq "!") {
            $code.=" ".$word;
        }
        elsif ($word =~ /^(link|backlink|created_before|created_after|creation_month|creation_year|creation_day)\((.+)\)$/) {
            $code.=" match_$1(\$page, ".safequote($2).")";
        }
        else {
            $code.=" match_glob(\$page, ".safequote($word).")";
        }
    }

    return $code;
} #}}}

sub add_depends ($$) { #{{{
    my $page=shift;
    my $pagespec=shift;
    
    if (! exists $depends{$page}) {
        $depends{$page}=$pagespec;
    }
    else {
        $depends{$page}=pagespec_merge($depends{$page}, $pagespec);
    }
} # }}}

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}}).')';
    $file =~ m/$regexp/;
} #}}}

sub pagespec_match ($$) { #{{{
    my $page=shift;
    my $spec=shift;

    return eval pagespec_translate($spec);
} #}}}

sub match_glob ($$) { #{{{
    my $page=shift;
    my $glob=shift;

    # turn glob into safe regexp
    $glob=quotemeta($glob);
    $glob=~s/\\\*/.*/g;
    $glob=~s/\\\?/./g;

    return $page=~/^$glob$/i;
} #}}}

sub match_link ($$) { #{{{
    my $page=shift;
    my $link=lc(shift);

    my $links = $links{$page} or return undef;
    foreach my $p (@$links) {
        return 1 if lc $p eq $link;
    }
    return 0;
} #}}}

sub match_backlink ($$) { #{{{
    match_link(pop, pop);
} #}}}

sub match_created_before ($$) { #{{{
    my $page=shift;
    my $testpage=shift;

    if (exists $pagectime{$testpage}) {
        return $pagectime{$page} < $pagectime{$testpage};
    }
    else {
        return 0;
    }
} #}}}

sub match_created_after ($$) { #{{{
    my $page=shift;
    my $testpage=shift;

    if (exists $pagectime{$testpage}) {
        return $pagectime{$page} > $pagectime{$testpage};
    }
    else {
        return 0;
    }
} #}}}

sub match_creation_day ($$) { #{{{
    return ((gmtime($pagectime{shift()}))[3] == shift);
} #}}}

sub match_creation_month ($$) { #{{{
    return ((gmtime($pagectime{shift()}))[4] + 1 == shift);
} #}}}

sub match_creation_year ($$) { #{{{
    return ((gmtime($pagectime{shift()}))[5] + 1900 == shift);
} #}}}

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