path: root/IkiWiki/Render.pm

package IkiWiki;

use warnings;
use strict;
use File::Spec;

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

    $content =~ s{(\\?)$config{wiki_link_regexp}}{
        $1 ? "[[$2]]" : htmllink($page, $2)
    }eg;
    
    return $content;
} #}}}

sub htmlize ($$) { #{{{
    my $type=shift;
    my $content=shift;
    
    if (! $INC{"/usr/bin/markdown"}) {
        no warnings 'once';
        $blosxom::version="is a proper perl module too much to ask?";
        use warnings 'all';
        do "/usr/bin/markdown";
    }
    
    if ($type eq '.mdwn') {
        return Markdown::Markdown($content);
    }
    else {
        error("htmlization of $type not supported");
    }
} #}}}

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 $href=File::Spec->abs2rel(htmlpage($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 => $p_trimmed };
        }
    }

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

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

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

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

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

    my $title=pagetitle(basename($page));
    
    my $template=HTML::Template->new(blind_cache => 1,
        filename => "$config{templatedir}/page.tmpl");
    
    if (length $config{cgiurl}) {
        $template->param(editurl => "$config{cgiurl}?do=edit&page=$page");
        $template->param(prefsurl => "$config{cgiurl}?do=prefs");
        if ($config{rcs}) {
            $template->param(recentchangesurl => "$config{cgiurl}?do=recentchanges");
        }
    }

    if (length $config{historyurl}) {
        my $u=$config{historyurl};
        $u=~s/\[\[file\]\]/$pagesources{$page}/g;
        $template->param(historyurl => $u);
    }

    if ($config{rss}) {
        $template->param(rssurl => rsspage($page));
    }
    
    $template->param(
        title => $title,
        wikiname => $config{wikiname},
        parentlinks => [parentlinks($page)],
        content => $content,
        backlinks => [backlinks($page)],
        discussionlink => htmllink($page, "Discussion", 1, 1),
        mtime => scalar(gmtime($mtime)),
    );
    
    return $template->output;
} #}}}

sub date_822 ($) { #{{{
    my $time=shift;

    eval q{use POSIX};
    return POSIX::strftime("%a, %d %b %Y %H:%M:%S %z", localtime($time));
} #}}}

sub absolute_urls ($$) { #{{{
    my $content=shift;
    my $url=shift;

    $url=~s/[^\/]+$//;
    
    $content=~s{<a\s+href="([^"]+)"}{
        "<a href=\"$url$1\""
    }ieg;
    $content=~s{<img\s+src="([^"]+)"}{
        "<img src=\"$url$1\""
    }ieg;
    return $content;
} #}}}

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

    my $url="$config{url}/".htmlpage($page);
    
    my $template=HTML::Template->new(blind_cache => 1,
        filename => "$config{templatedir}/rsspage.tmpl");
    
    # Regular page gets a feed that is updated every time the
    # page is changed, so the mtime is encoded in the guid.
    my @items=(
        {
            itemtitle => pagetitle(basename($page)),
            itemguid => "$url?mtime=$mtime",
            itemurl => $url,
            itempubdate => date_822($mtime),
            itemcontent => absolute_urls($content, $url), # rss sucks
        },
    );
    
    $template->param(
        title => pagetitle(basename($page)),
        pageurl => $url,
        items => \@items,
    );
    
    return $template->output;
} #}}}

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 rendered from ".
            join(" ",(grep { $renderedfiles{$_} eq $dest } keys
                %renderedfiles)).
            ", before, so not rendering from $src");
    }
} #}}}

sub mtime ($) { #{{{
    my $page=shift;
    
    return (stat($page))[9];
} #}}}

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

    my @links;
    while ($content =~ /(?<!\\)$config{wiki_link_regexp}/g) {
        push @links, lc($1);
    }
    # Discussion links are a special case since they're not in the text
    # of the page, but on its template.
    return @links, "$page/discussion";
} #}}}

sub render ($) { #{{{
    my $file=shift;
    
    my $type=pagetype($file);
    my $content=readfile("$config{srcdir}/$file");
    if ($type ne 'unknown') {
        my $page=pagename($file);
        
        $links{$page}=[findlinks($content, $page)];
        
        $content=linkify($content, $page);
        $content=htmlize($type, $content);
        
        check_overwrite("$config{destdir}/".htmlpage($page), $page);
        writefile("$config{destdir}/".htmlpage($page),
            genpage($content, $page, mtime("$config{srcdir}/$file")));      
        $oldpagemtime{$page}=time;
        $renderedfiles{$page}=htmlpage($page);

        # TODO: should really add this to renderedfiles and call
        # check_overwrite, as above, but currently renderedfiles
        # only supports listing one file per page.
        if ($config{rss}) {
            writefile("$config{destdir}/".rsspage($page),
                genrss($content, $page, mtime("$config{srcdir}/$file")));
        }
    }
    else {
        $links{$file}=[];
        check_overwrite("$config{destdir}/$file", $file);
        writefile("$config{destdir}/$file", $content);
        $oldpagemtime{$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 {
            if (/$config{wiki_file_prune_regexp}/) {
                no warnings 'once';
                $File::Find::prune=1;
                use warnings "all";
            }
            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});

    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");
            push @add, $file;
            $links{$page}=[];
            $pagesources{$page}=$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("$config{srcdir}/$file") > $oldpagemtime{$page}) {
                debug("rendering changed file $file");
            render($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
    # 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
    # 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) {
        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 { $_ 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 { $_ 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);
            }
        }
    }
} #}}}

1