path: root/IkiWiki.pm

#!/usr/bin/perl

package IkiWiki;
use warnings;
use strict;
use File::Spec;
use HTML::Template;

use vars qw{%config %links %oldlinks %oldpagemtime %pagectime
            %renderedfiles %pagesources %depends %plugins};

sub checkconfig () { #{{{
    if ($config{cgi} && ! length $config{url}) {
        error("Must specify url to wiki with --url when using --cgi\n");
    }
    if ($config{rss} && ! length $config{url}) {
        error("Must specify url to wiki with --url when using --rss\n");
    }
    if ($config{hyperestraier} && ! length $config{url}) {
        error("Must specify --url when using --hyperestraier\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;
    }

    foreach my $plugin (@{$config{plugin}}) {
        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>");
    }
    die @_;
} #}}}

sub debug ($) { #{{{
    return unless $config{verbose};
    if (! $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 ($page =~ /\.mdwn$/) {
        return ".mdwn";
    }
    else {
        return "unknown";
    }
} #}}}

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

    my $type=pagetype($file);
    my $page=$file;
    $page=~s/\Q$type\E*$// unless $type eq 'unknown';
    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;
} #}}}

sub bestlink ($$) { #{{{
    # Given a page and the text of a link on the page, determine which
    # existing page that link best points to. Prefers pages under a
    # subdirectory with the same name as the source page, failing that
    # goes down the directory tree to the base looking for matching
    # pages.
    my $page=shift;
    my $link=lc(shift);
    
    my $cwd=$page;
    do {
        my $l=$cwd;
        $l.="/" if length $l;
        $l.=$link;

        if (exists $links{$l}) {
            #debug("for $page, \"$link\", use $l");
            return $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;
    $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 styleurl (;$) { #{{{
    my $page=shift;

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

sub htmllink ($$;$$$) { #{{{
    my $page=shift;
    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) {
        $bestlink=bestlink($page, $link);
    }
    else {
        $bestlink="$page/".lc($link);
    }

    $linktext=pagetitle(basename($link)) unless defined $linktext;
    
    return $linktext if length $bestlink && $page eq $bestlink;
    
    # 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 mentioned below that makes all new files
    # be rendered twice.
    if (! grep { $_ eq $bestlink } values %renderedfiles) {
        $bestlink=htmlpage($bestlink);
    }
    if (! grep { $_ eq $bestlink } values %renderedfiles) {
        return "<span><a href=\"".
            cgiurl(do => "create", page => $link, from =>$page).
            "\">?</a>$linktext</span>"
    }
    
    $bestlink=File::Spec->abs2rel($bestlink, dirname($page));
    
    if (! $noimageinline && isinlinableimage($bestlink)) {
        return "<img src=\"$bestlink\" alt=\"$linktext\" />";
    }
    return "<a href=\"$bestlink\">$linktext</a>";
} #}}}

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}=[];
        foreach my $i (split(/ /, $_)) {
            my ($item, $val)=split(/=/, $i, 2);
            push @{$items{$item}}, $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}=join(" ", @{$items{depends}})
                if exists $items{depends};
            $renderedfiles{$page}=$items{dest}[0];
        }
        $pagectime{$page}=$items{ctime}[0];
    }
    close IN;
} #}}}

sub saveindex () { #{{{
    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{$page} ".
            "dest=$renderedfiles{$page}";
        $line.=" link=$_" foreach @{$links{$page}};
        if (exists $depends{$page}) {
            $line.=" depends=$_" foreach split " ", $depends{$page};
        }
        print OUT $line."\n";
    }
    close OUT;
} #}}}

sub misctemplate ($$) { #{{{
    my $title=shift;
    my $pagebody=shift;
    
    my $template=HTML::Template->new(
        filename => "$config{templatedir}/misc.tmpl"
    );
    $template->param(
        title => $title,
        indexlink => indexlink(),
        wikiname => $config{wikiname},
        pagebody => $pagebody,
        styleurl => styleurl(),
        baseurl => "$config{url}/",
    );
    return $template->output;
}#}}}

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

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

sub globlist_match ($$) { #{{{
    my $page=shift;
    my @globlist=split(" ", shift);

    # check any negated globs first
    foreach my $glob (@globlist) {
        return 0 if $glob=~/^!(.*)/ && glob_match($page, $1);
    }

    foreach my $glob (@globlist) {
        return 1 if glob_match($page, $glob);
    }
    
    return 0;
} #}}}

sub register_plugin ($$$) { # {{{
    my $type=shift;
    my $command=shift;
    my $function=shift;
    
    $plugins{$type}{$command}=$function;
} # }}}

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