path: root/IkiWiki/Plugin/topbar.pm

#!/usr/bin/perl
# Topbar plugin.
# by Jonas Smedegaard <dr@jones.dk>
# Heavily based on Sidebar by Tuomo Valkonen <tuomov at iki dot fi> 

package IkiWiki::Plugin::topbar;

use warnings;
use strict;
use IkiWiki 3.00;

sub import {
    hook(type => "getsetup", id => "topbar", call => \&getsetup);
    hook(type => "preprocess", id => "topbar", call => \&preprocess);
    hook(type => "pagetemplate", id => "topbar", call => \&pagetemplate);
}

sub getsetup () {
    return
        plugin => {
            safe => 1,
            rebuild => 1,
        },
        global_topbars => {
            type => "boolean",
            example => 1,
            description => "show topbar page on all pages?",
            safe => 1,
            rebuild => 1,
        },
}

my %pagetopbar;

sub preprocess (@) {
    my %params=@_;

    my $page=$params{page};
    return "" unless $page eq $params{destpage};
    
    if (! defined $params{content}) {
        $pagetopbar{$page}=undef;
    }
    else {
        my $file = $pagesources{$page};
        my $type = pagetype($file);

        $pagetopbar{$page}=
            IkiWiki::htmlize($page, $page, $type,
            IkiWiki::linkify($page, $page,
            IkiWiki::preprocess($page, $page, $params{content})));
    }

    return "";
}

my $oldfile;
my $oldcontent;

sub topbar_content ($) {
    my $page=shift;
    
    return delete $pagetopbar{$page} if defined $pagetopbar{$page};

    return if ! exists $pagetopbar{$page} && 
        defined $config{global_topbars} && ! $config{global_topbars};

    my $topbar_page=bestlink($page, "topbar") || return;
    my $topbar_file=$pagesources{$topbar_page} || return;
    my $topbar_type=pagetype($topbar_file);
    
    if (defined $topbar_type) {
        # FIXME: This isn't quite right; it won't take into account
        # adding a new topbar page. So adding such a page
        # currently requires a wiki rebuild.
        add_depends($page, $topbar_page);

        my $content;
        if (defined $oldfile && $topbar_file eq $oldfile) {
            $content=$oldcontent;
        }
        else {
            $content=readfile(srcfile($topbar_file));
            $oldcontent=$content;
            $oldfile=$topbar_file;
        }

        return unless length $content;
        return IkiWiki::htmlize($topbar_page, $page, $topbar_type,
               IkiWiki::linkify($topbar_page, $page,
               IkiWiki::preprocess($topbar_page, $page,
               IkiWiki::filter($topbar_page, $page, $content))));
    }

}

sub pagetemplate (@) {
    my %params=@_;

    my $template=$params{template};
    if ($params{destpage} eq $params{page} &&
        $template->query(name => "topbar")) {
        my $content=topbar_content($params{destpage});
        if (defined $content && length $content) {
                $template->param(topbar => $content);
        }
    }
}

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