path: root/IkiWiki/Plugin/conditional.pm

#!/usr/bin/perl
package IkiWiki::Plugin::conditional;

use warnings;
use strict;
use IkiWiki;
use UNIVERSAL;

# Globals used to pass information into the PageSpec functions.
our ($sourcepage, $destpage);

sub import { #{{{
    hook(type => "preprocess", id => "if", call => \&preprocess_if);
} # }}}

sub preprocess_if (@) { #{{{
    my %params=@_;

    if (! exists $params{test} || ! exists $params{then}) {
        return "[[if requires \"test\" and \"then\" parameters]]";
    }

    my $result=0;
    $sourcepage=$params{page};
    $destpage=$params{destpage};
    # An optimisation to avoid needless looping over every page
    # and adding of dependencies for simple uses of some of the
    # tests.
    if ($params{test} =~ /^(enabled|sourcepage|destpage)\((.*)\)$/) {
        $result=eval "IkiWiki::PageSpec::match_$1(undef, ".
            IkiWiki::safequote($2).")";
    }
    else {
        add_depends($params{page}, $params{test});

        foreach my $page (keys %pagesources) {
            if (pagespec_match($page, $params{test}, $params{page})) {
                $result=1;
                last;
            }
        }
    }
    $sourcepage="";
    $destpage="";

    my $ret;
    if ($result) {
        $ret=$params{then};
    }
    elsif (exists $params{else}) {
        $ret=$params{else};
    }
    else {
        $ret="";
    }
    return IkiWiki::preprocess($params{page}, $params{destpage}, $ret);
} # }}}

package IkiWiki::PageSpec;

sub match_enabled ($$) { #{{{
    shift;
    my $plugin=shift;
    
    # test if the plugin is enabled
    return UNIVERSAL::can("IkiWiki::Plugin::".$plugin, "import");
} #}}}

sub match_sourcepage ($$) { #{{{
    shift;
    my $glob=shift;
    
    return match_glob($IkiWiki::Plugin::conditional::sourcepage, $glob,
        $IkiWiki::Plugin::conditional::sourcepage);
} #}}}

sub match_destpage ($$) { #{{{
    shift;
    my $glob=shift;
    
    return match_glob($IkiWiki::Plugin::conditional::destpage, $glob,
        $IkiWiki::Plugin::conditional::sourcepage);
} #}}}

sub match_included ($$) { #{{{
    return $IkiWiki::Plugin::conditional::sourcepage ne $IkiWiki::Plugin::conditional::destpage;
} #}}}

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