path: root/IkiWiki/Render.pm

#!/usr/bin/perl

package IkiWiki;

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

my %backlinks;
my $backlinks_calculated=0;

sub calculate_backlinks () { #{{{
    return if $backlinks_calculated;
    %backlinks=();
    foreach my $page (keys %links) {
        foreach my $link (@{$links{$page}}) {
            my $bestlink=bestlink($page, $link);
            if (length $bestlink && $bestlink ne $page) {
                $backlinks{$bestlink}{$page}=1;
            }
        }
    }
    $backlinks_calculated=1;
} #}}}

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

    calculate_backlinks();

    my @links;
    foreach my $p (keys %{$backlinks{$page}}) {
        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) };
    }
    @links = sort { $a->{page} cmp $b->{page} } @links;

    return \@links, [] if @links <= $config{numbacklinks};
    return [@links[0..$config{numbacklinks}-1]],
           [@links[$config{numbacklinks}..$#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;
} #}}}

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}) {
        $template->param(editurl => cgiurl(do => "edit", page => pagetitle($page, 1)));
        $template->param(prefsurl => cgiurl(do => "prefs"));
        if ($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}) {
        my $discussionlink=gettext("discussion");
        if ($page !~ /.*\/\Q$discussionlink\E$/ &&
           (length $config{cgiurl} ||
            exists $links{$page."/".$discussionlink})) {
            $template->param(discussionlink => htmllink($page, $page, gettext("Discussion"), noimageinline => 1, forcesubpage => 1));
            $actions++;
        }
    }

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

    my ($backlinks, $more_backlinks)=backlinks($page);

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

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

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

    return $content;
} #}}}

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

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

    my $type=pagetype($file);
    if (defined $type) {
        my $srcfile=srcfile($file);
        my $content=readfile($srcfile);
        my $page=pagename($file);
        will_render($page, htmlpage($page), 1);

        # Always needs to be done, since filters might add links
        # to the content.
        $content=filter($page, $content);

        my @links;
        while ($content =~ /(?<!\\)$config{wiki_link_regexp}/g) {
            push @links, linkpage($2);
        }
        if ($config{discussion}) {
            # Discussion links are a special case since they're
            # not in the text of the page, but on its template.
            push @links, $page."/".gettext("discussion");
        }
        $links{$page}=\@links;
        
        # Preprocess in scan-only mode.
        preprocess($page, $page, $content, 1);
    }
    else {
        will_render($file, $file, 1);
    }
} #}}}

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};
        will_render($page, htmlpage($page), 1);
        
        $content=filter($page, $content);
        $content=preprocess($page, $page, $content);
        $content=linkify($page, $page, $content);
        $content=htmlize($page, $type, $content);
        
        writefile(htmlpage($page), $config{destdir},
            genpage($page, $content, mtime($srcfile)));
    }
    else {
        my $srcfd=readfile($srcfile, 1, 1);
        delete $depends{$file};
        will_render($file, $file, 1);
        writefile($file, $config{destdir}, undef, 1, sub {
            my $destfd=shift;
            my $cleanup=shift;

            my $blksize = 16384;
            my ($len, $buf, $written);
            while ($len = sysread $srcfd, $buf, $blksize) {
                if (! defined $len) {
                    next if $! =~ /^Interrupted/;
                    error("failed to read $srcfile: $!", $cleanup);
                }
                my $offset = 0;
                while ($len) {
                    defined($written = syswrite $destfd, $buf, $len, $offset)
                        or error("failed to write $file: $!", $cleanup);
                    $len -= $written;
                    $offset += $written;
                }
            }
        });
    }
} #}}}

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

    my %rendered;

    # check for added or removed pages
    my @add;
    foreach my $file (@files) {
        my $page=pagename($file);
        $pagesources{$page}=$file;
        if (! $pagemtime{$page}) {
            push @add, $file;
            $pagecase{lc $page}=$page;
            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 %pagemtime) {
        if (! $exists{$page}) {
            debug(sprintf(gettext("removing old page %s"), $page));
            push @del, $pagesources{$page};
            $links{$page}=[];
            $renderedfiles{$page}=[];
            $pagemtime{$page}=0;
            prune($config{destdir}."/".$_)
                foreach @{$oldrenderedfiles{$page}};
            delete $pagesources{$page};
        }
    }

    # scan changed and new files
    my @changed;
    foreach my $file (@files) {
        my $page=pagename($file);
        
        my $mtime=mtime(srcfile($file));
        if (! exists $pagemtime{$page} ||
            $mtime > $pagemtime{$page} ||
                $forcerebuild{$page}) {
                debug(sprintf(gettext("scanning %s"), $file));
                $pagemtime{$page}=$mtime;
            push @changed, $file;
            scan($file);
        }
    }
    calculate_backlinks();

    # render changed and new pages
    foreach my $file (@changed) {
        debug(sprintf(gettext("rendering %s"), $file));
        render($file);
        $rendered{$file}=1;
    }
    
    # rebuild pages that link to added or removed pages
    if (@add || @del) {
        foreach my $f (@add, @del) {
            my $p=pagename($f);
            foreach my $page (keys %{$backlinks{$p}}) {
                my $file=$pagesources{$page};
                next if $rendered{$file};
                debug(sprintf(gettext("rendering %s, which links to %s"), $file, $p));
                render($file);
                $rendered{$file}=1;
            }
        }
    }

    if (%rendered || @del) {
        # rebuild dependant pages
        foreach my $f (@files) {
            next if $rendered{$f};
            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}, $p)) {
                        debug(sprintf(gettext("rendering %s, which depends on %s"), $f, $page));
                        render($f);
                        $rendered{$f}=1;
                        last;
                    }
                }
            }
        }
        
        # handle backlinks; if a page has added/removed links,
        # update the pages it links to
        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) {
                next if $rendered{$linkfile};
                debug(sprintf(gettext("rendering %s, to update its backlinks"), $linkfile));
                render($linkfile);
                $rendered{$linkfile}=1;
            }
        }
    }

    # remove no longer rendered files
    foreach my $src (keys %rendered) {
        my $page=pagename($src);
        foreach my $file (@{$oldrenderedfiles{$page}}) {
            if (! grep { $_ eq $file } @{$renderedfiles{$page}}) {
                debug(sprintf(gettext("removing %s, no longer rendered by %s"), $file, $page));
                prune($config{destdir}."/".$file);
            }
        }
    }

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

sub commandline_render () { #{{{
    loadplugins();
    checkconfig();
    lockwiki();
    loadindex();
    unlockwiki();

    my $srcfile=possibly_foolish_untaint($config{render});
    my $file=$srcfile;
    $file=~s/\Q$config{srcdir}\E\/?//;

    my $type=pagetype($file);
    die sprintf(gettext("ikiwiki: cannot render %s"), $srcfile)."\n" unless defined $type;
    my $content=readfile($srcfile);
    my $page=pagename($file);
    $pagesources{$page}=$file;
    $content=filter($page, $content);
    $content=preprocess($page, $page, $content);
    $content=linkify($page, $page, $content);
    $content=htmlize($page, $type, $content);

    print genpage($page, $content, mtime($srcfile));
    exit 0;
} #}}}

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