path: root/IkiWiki/Plugin/orphans.pm

#!/usr/bin/perl
# Provides a list of pages no other page links to.
package IkiWiki::Plugin::orphans;

use warnings;
use strict;
use IkiWiki;

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

sub preprocess (@) { #{{{
    my %params=@_;
    $params{pages}="*" unless defined $params{pages};
    
    # Needs to update whenever a page is added or removed, so
    # register a dependency.
    add_depends($params{page}, $params{pages});
    
    my %linkedto;
    foreach my $p (keys %links) {
        map { $linkedto{bestlink($p, $_)}=1 if length $_ }
            @{$links{$p}};
    }
    
    my @orphans;
    my $discussion=gettext("discussion");
    foreach my $page (keys %renderedfiles) {
        next if $linkedto{$page};
        next unless pagespec_match($page, $params{pages}, $params{page});
        # If the page has a link to some other page, it's
        # indirectly linked to a page via that page's backlinks.
        next if grep { 
            length $_ &&
            ($_ !~ /\/\Q$discussion\E$/i || ! $config{discussion}) &&
            bestlink($page, $_) !~ /^($page|)$/ 
        } @{$links{$page}};
        push @orphans, $page;
    }
    
    return gettext("All pages are linked to by other pages.") unless @orphans;
    return "<ul>\n".
        join("\n",
            map {
                "<li>".
                htmllink($params{page}, $params{destpage}, $_,
                     noimageinline => 1).
                "</li>"
            } sort @orphans).
        "</ul>\n";
} # }}}

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