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;

sub import { #{{{
    IkiWiki::register_plugin("preprocess", "orphans", \&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.
    IkiWiki::add_depends($params{page}, $params{pages});
    
    my %linkedto;
    foreach my $p (keys %IkiWiki::links) {
        map { $linkedto{IkiWiki::bestlink($p, $_)}=1 if length $_ }
            @{$IkiWiki::links{$p}};
    }
    
    my @orphans;
    foreach my $page (keys %IkiWiki::renderedfiles) {
        next if $linkedto{$page};
        next unless IkiWiki::globlist_match($page, $params{pages});
        # 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 $_ && $_ !~/\/Discussion$/i && IkiWiki::bestlink($page, $_) ne $page } @{$IkiWiki::links{$page}};
        push @orphans, $page;
    }
    
    return "All pages are linked to by other pages." unless @orphans;
    return "<ul>\n".join("\n", map { "<li>".IkiWiki::htmllink($params{page}, $_, 1)."</li>" } sort @orphans)."</ul>\n";
} # }}}

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