+ elsif ($key eq 'redir') {
+ return "" if $page ne $destpage;
+ my $safe=0;
+ if ($value !~ /^\w+:\/\//) {
+ add_depends($page, $value);
+ my $link=bestlink($page, $value);
+ if (! length $link) {
+ return "[[meta ".gettext("redir page not found")."]]";
+ }
+
+ $value=urlto($link, $page);
+ $safe=1;
+
+ # redir cycle detection
+ $pagestate{$page}{meta}{redir}=$link;
+ my $at=$page;
+ my %seen;
+ while (exists $pagestate{$at}{meta}{redir}) {
+ if ($seen{$at}) {
+ return "[[meta ".gettext("redir cycle is not allowed")."]]";
+ }
+ $seen{$at}=1;
+ $at=$pagestate{$at}{meta}{redir};
+ }