path: root/IkiWiki/Render.pm

#!/usr/bin/perl

package IkiWiki;

use warnings;
use strict;
use IkiWiki;
use Encode;

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;
} #}}}

sub htmlize ($$) { #{{{
    my $type=shift;
    my $content=shift;
    
    if (exists $hooks{htmlize}{$type}) {
        $content=$hooks{htmlize}{$type}{call}->($content);
    }
    else {
        error("htmlization of $type not supported");
    }

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

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

    my @links;
    foreach my $p (keys %links) {
        next if bestlink($page, $p) eq $page;
        if (grep { length $_ && bestlink($p, $_) eq $page } @{$links{$p}}) {
            my $href=abs2rel(htmlpage($p), dirname($page));
            
            # Trim common dir prefixes from both pages.
            my $p_trimmed=$p;
            my $page_trimmed=$page;
            my $dir;
            1 while (($dir)=$page_trimmed=~m!^([^/]+/)!) &&
                    defined $dir &&
                    $p_trimmed=~s/^\Q$dir\E// &&
                    $page_trimmed=~s/^\Q$dir\E//;
                       
            push @links, { url => $href, page => pagetitle($p_trimmed) };
        }
    }

    return sort { $a->{page} cmp $b->{page} } @links;
} #}}}

sub parentlinks ($) { #{{{
    my $page=shift;
    
    my @ret;
    my $pagelink="";
    my $path="";
    my $skip=1;
    return if $page eq 'index'; # toplevel
    foreach my $dir (reverse split("/", $page)) {
        if (! $skip) {
            $path.="../";
            unshift @ret, { url => $path.htmlpage($dir), page => pagetitle($dir) };
        }
        else {
            $skip=0;
        }
    }
    unshift @ret, { url => length $path ? $path : ".", page => $config{wikiname} };
    return @ret;
} #}}}

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 $handle=sub {
        my $escape=shift;
        my $command=shift;
        my $params=shift;
        if (length $escape) {
            return "[[$command $params]]";
        }
        elsif ($preprocessing{$page}++ > 10) {
            # Avoid loops of preprocessed pages preprocessing
            # other pages that preprocess them, etc.
            return "[[$command preprocessing loop detected on $page at depth $preprocessing{$page}]]";
        }
        elsif (exists $hooks{preprocess}{$command}) {
            # 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, '';
                }
            }
            my $ret=$hooks{preprocess}{$command}{call}->(
                @params,
                page => $page,
                destpage => $destpage,
            );
            $preprocessing{$page}--;
            return $ret;
        }
        else {
            return "[[$command not processed]]";
        }
    };
    
    $content =~ s{(\\?)\[\[(\w+)\s+((?:(?:\w+=)?(?:""".*?"""|"[^"]+"|[^\s\]]+)\s*)*)\]\]}{$handle->($1, $2, $3)}seg;
    return $content;
} #}}}

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 genpage ($$$) { #{{{
    my $page=shift;
    my $content=shift;
    my $mtime=shift;

    my $template=template("page.tmpl", blind_cache => 1);
    my $actions=0;

    if (length $config{cgiurl}) {
        $template->param(editurl => cgiurl(do => "edit", page => $page));
        $template->param(prefsurl => cgiurl(do => "prefs"));
        if ($config{rcs}) {
            $template->param(recentchangesurl => cgiurl(do => "recentchanges"));
        }
        $actions++;
    }

    if (length $config{historyurl}) {
        my $u=$config{historyurl};
        $u=~s/\[\[file\]\]/$pagesources{$page}/g;
        $template->param(historyurl => $u);
        $actions++;
    }
    if ($config{discussion}) {
        $template->param(discussionlink => htmllink($page, $page, "Discussion", 1, 1));
        $actions++;
    }

    if ($actions) {
        $template->param(have_actions => 1);
    }

    $template->param(
        title => $page eq 'index' 
            ? $config{wikiname} 
            : pagetitle(basename($page)),
        wikiname => $config{wikiname},
        parentlinks => [parentlinks($page)],
        content => $content,
        backlinks => [backlinks($page)],
        mtime => displaytime($mtime),
        baseurl => baseurl($page),
    );

    run_hooks(pagetemplate => sub {
        shift->(page => $page, destpage => $page, template => $template);
    });
    
    $content=$template->output;

    run_hooks(format => sub {
        $content=shift->($content);
    });

    return $content;
} #}}}

sub check_overwrite ($$) { #{{{
    # Important security check. Make sure to call this before saving
    # any files to the source directory.
    my $dest=shift;
    my $src=shift;
    
    if (! exists $renderedfiles{$src} && -e $dest && ! $config{rebuild}) {
        error("$dest already exists and was not rendered from $src before");
    }
} #}}}

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

    eval q{use POSIX};
    # 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 mtime ($) { #{{{
    my $file=shift;
    
    return (stat($file))[9];
} #}}}

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

    my @links;
    while ($content =~ /(?<!\\)$config{wiki_link_regexp}/g) {
        push @links, titlepage($2);
    }
    if ($config{discussion}) {
        # Discussion links are a special case since they're not in the
        # text of the page, but on its template.
        return @links, "$page/discussion";
    }
    else {
        return @links;
    }
} #}}}

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

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

    return $content;
}

sub render ($) { #{{{
    my $file=shift;
    
    my $type=pagetype($file);
    my $srcfile=srcfile($file);
    if (defined $type) {
        my $content=readfile($srcfile);
        my $page=pagename($file);
        delete $depends{$page};
        
        $content=filter($page, $content);
        
        $links{$page}=[findlinks($page, $content)];
        
        $content=preprocess($page, $page, $content);
        $content=linkify($page, $page, $content);
        $content=htmlize($type, $content);
        
        check_overwrite("$config{destdir}/".htmlpage($page), $page);
        writefile(htmlpage($page), $config{destdir},
            genpage($page, $content, mtime($srcfile)));
        $oldpagemtime{$page}=time;
        $renderedfiles{$page}=htmlpage($page);
    }
    else {
        my $content=readfile($srcfile, 1);
        $links{$file}=[];
        delete $depends{$file};
        check_overwrite("$config{destdir}/$file", $file);
        writefile($file, $config{destdir}, $content, 1);
        $oldpagemtime{$file}=time;
        $renderedfiles{$file}=$file;
    }
} #}}}

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

    unlink($file);
    my $dir=dirname($file);
    while (rmdir($dir)) {
        $dir=dirname($dir);
    }
} #}}}

sub refresh () { #{{{
    # find existing pages
    my %exists;
    my @files;
    eval q{use File::Find};
    find({
        no_chdir => 1,
        wanted => sub {
            $_=decode_utf8($_);
            if (/$config{wiki_file_prune_regexp}/) {
                $File::Find::prune=1;
            }
            elsif (! -d $_ && ! -l $_) {
                my ($f)=/$config{wiki_file_regexp}/; # untaint
                if (! defined $f) {
                    warn("skipping bad filename $_\n");
                }
                else {
                    $f=~s/^\Q$config{srcdir}\E\/?//;
                    push @files, $f;
                    $exists{pagename($f)}=1;
                }
            }
        },
    }, $config{srcdir});
    find({
        no_chdir => 1,
        wanted => sub {
            $_=decode_utf8($_);
            if (/$config{wiki_file_prune_regexp}/) {
                $File::Find::prune=1;
            }
            elsif (! -d $_ && ! -l $_) {
                my ($f)=/$config{wiki_file_regexp}/; # untaint
                if (! defined $f) {
                    warn("skipping bad filename $_\n");
                }
                else {
                    # Don't add files that are in the
                    # srcdir.
                    $f=~s/^\Q$config{underlaydir}\E\/?//;
                    if (! -e "$config{srcdir}/$f" && 
                        ! -l "$config{srcdir}/$f") {
                        push @files, $f;
                        $exists{pagename($f)}=1;
                    }
                }
            }
        },
    }, $config{underlaydir});

    my %rendered;

    # check for added or removed pages
    my @add;
    foreach my $file (@files) {
        my $page=pagename($file);
        if (! $oldpagemtime{$page}) {
            debug("new page $page") unless exists $pagectime{$page};
            push @add, $file;
            $links{$page}=[];
            $pagecase{lc $page}=$page;
            $pagesources{$page}=$file;
            if ($config{getctime} && -e "$config{srcdir}/$file") {
                $pagectime{$page}=rcs_getctime("$config{srcdir}/$file");
            }
            elsif (! exists $pagectime{$page}) {
                $pagectime{$page}=mtime(srcfile($file));
            }
        }
    }
    my @del;
    foreach my $page (keys %oldpagemtime) {
        if (! $exists{$page}) {
            debug("removing old page $page");
            push @del, $pagesources{$page};
            prune($config{destdir}."/".$renderedfiles{$page});
            delete $renderedfiles{$page};
            $oldpagemtime{$page}=0;
            delete $pagesources{$page};
        }
    }
    
    # render any updated files
    foreach my $file (@files) {
        my $page=pagename($file);
        
        if (! exists $oldpagemtime{$page} ||
            mtime(srcfile($file)) > $oldpagemtime{$page} ||
                $forcerebuild{$page}) {
                debug("rendering $file");
            render($file);
            $rendered{$file}=1;
        }
    }
    
    # if any files were added or removed, check to see if each page
    # needs an update due to linking to them or inlining them.
    # TODO: inefficient; pages may get rendered above and again here;
    # problem is the bestlink may have changed and we won't know until
    # now
    if (@add || @del) {
FILE:       foreach my $file (@files) {
            my $page=pagename($file);
            foreach my $f (@add, @del) {
                my $p=pagename($f);
                foreach my $link (@{$links{$page}}) {
                    if (bestlink($page, $link) eq $p) {
                        debug("rendering $file, which links to $p");
                        render($file);
                        $rendered{$file}=1;
                        next FILE;
                    }
                }
            }
        }
    }

    # Handle backlinks; if a page has added/removed links, update the
    # pages it links to. Also handles rebuilding dependant pages.
    # TODO: inefficient; pages may get rendered above and again here;
    # problem is the backlinks could be wrong in the first pass render
    # above
    if (%rendered || @del) {
        foreach my $f (@files) {
            my $p=pagename($f);
            if (exists $depends{$p}) {
                foreach my $file (keys %rendered, @del) {
                    next if $f eq $file;
                    my $page=pagename($file);
                    if (pagespec_match($page, $depends{$p})) {
                        debug("rendering $f, which depends on $page");
                        render($f);
                        $rendered{$f}=1;
                        last;
                    }
                }
            }
        }
        
        my %linkchanged;
        foreach my $file (keys %rendered, @del) {
            my $page=pagename($file);
            
            if (exists $links{$page}) {
                foreach my $link (map { bestlink($page, $_) } @{$links{$page}}) {
                    if (length $link &&
                        (! exists $oldlinks{$page} ||
                         ! grep { bestlink($page, $_) eq $link } @{$oldlinks{$page}})) {
                        $linkchanged{$link}=1;
                    }
                }
            }
            if (exists $oldlinks{$page}) {
                foreach my $link (map { bestlink($page, $_) } @{$oldlinks{$page}}) {
                    if (length $link &&
                        (! exists $links{$page} || 
                         ! grep { bestlink($page, $_) eq $link } @{$links{$page}})) {
                        $linkchanged{$link}=1;
                    }
                }
            }
        }
        foreach my $link (keys %linkchanged) {
                my $linkfile=$pagesources{$link};
            if (defined $linkfile) {
                debug("rendering $linkfile, to update its backlinks");
                render($linkfile);
                $rendered{$linkfile}=1;
            }
        }
    }

    if (@del) {
        run_hooks(delete => sub { shift->(@del) });
    }
    if (%rendered) {
        run_hooks(change => sub { shift->(keys %rendered) });
    }
} #}}}

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