ikiwiki/IkiWiki/Plugin/tag.pm

#!/usr/bin/perl
# Ikiwiki tag plugin.
package IkiWiki::Plugin::tag;

use warnings;
use strict;
use IkiWiki;

my %tags;

sub import { #{{{
	hook(type => "getopt", id => "tag", call => \&getopt);
	hook(type => "preprocess", id => "tag", call => \&preprocess, scan => 1);
	hook(type => "pagetemplate", id => "tag", call => \&pagetemplate);
} # }}}

sub getopt () { #{{{
	eval q{use Getopt::Long};
	error($@) if $@;
	Getopt::Long::Configure('pass_through');
	GetOptions("tagbase=s" => \$config{tagbase});
} #}}}

sub tagpage ($) { #{{{
	my $tag=shift;
			
	if (exists $config{tagbase} &&
	    defined $config{tagbase}) {
		$tag=$config{tagbase}."/".$tag;
	}

	return $tag;
} #}}}

sub preprocess (@) { #{{{
	if (! @_) {
		return "";
	}
	my %params=@_;
	my $page = $params{page};
	delete $params{page};
	delete $params{destpage};

	foreach my $tag (keys %params) {
		$tags{$page}{$tag}=1;
		# hidden WikiLink
		push @{$links{$page}}, tagpage($tag);
	}
		
	return "";
} # }}}

sub pagetemplate (@) { #{{{
	my %params=@_;
	my $page=$params{page};
	my $destpage=$params{destpage};
	my $template=$params{template};

	$template->param(tags => [
		map { 
			link => htmllink($page, $destpage, tagpage($_))
		}, sort keys %{$tags{$page}}
	]) if exists $tags{$page} && %{$tags{$page}} && $template->query(name => "tags");

	if ($template->query(name => "categories")) {
		# It's an rss/atom template. Add any categories.
		if (exists $tags{$page} && %{$tags{$page}}) {
			$template->param(categories => [map { category => $_ },
				sort keys %{$tags{$page}}]);
		}
	}
} # }}}

1