path: root/IkiWiki/Plugin/tag.pm

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

use warnings;
use strict;
use IkiWiki 2.00;

my %tags;

sub import {
    hook(type => "getopt", id => "tag", call => \&getopt);
    hook(type => "getsetup", id => "tag", call => \&getsetup);
    hook(type => "preprocess", id => "tag", call => \&preprocess_tag, scan => 1);
    hook(type => "preprocess", id => "taglink", call => \&preprocess_taglink, 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 getsetup () {
    return
        plugin => {
            safe => 1,
            rebuild => undef,
        },
        tagbase => {
            type => "string",
            example => "tag",
            description => "parent page tags are located under",
            safe => 1,
            rebuild => 1,
        },
}

sub tagpage ($) {
    my $tag=shift;
            
    if ($tag !~ m{^\.?/} &&
        defined $config{tagbase}) {
        $tag="/".$config{tagbase}."/".$tag;
        $tag=~y#/#/#s; # squash dups
    }

    return $tag;
}

sub taglink ($$$;@) {
    my $page=shift;
    my $destpage=shift;
    my $tag=shift;
    my %opts=@_;

    return htmllink($page, $destpage, tagpage($tag), %opts);
}

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

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

sub preprocess_taglink (@) {
    if (! @_) {
        return "";
    }
    my %params=@_;
    return join(" ", map {
        if (/(.*)\|(.*)/) {
            my $tag=linkpage($2);
            $tags{$params{page}}{$tag}=1;
            push @{$links{$params{page}}}, tagpage($tag);
            return taglink($params{page}, $params{destpage}, $tag,
                linktext => pagetitle($1));
        }
        else {
            my $tag=linkpage($_);
            $tags{$params{page}}{$tag}=1;
            push @{$links{$params{page}}}, tagpage($tag);
            return taglink($params{page}, $params{destpage}, $tag);
        }
    }
    grep {
        $_ ne 'page' && $_ ne 'destpage' && $_ ne 'preview'
    } keys %params);
}

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

    $template->param(tags => [
        map { 
            link => taglink($page, $destpage, $_, rel => "tag")
        }, sort keys %{$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}}]);
        }
    }
}

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