comments: Deal with users entering unqualified or partial urls.

People seem to be able to expect to enter www.foo.com and get away with it.
The resulting my.wiki/www.foo.com link was not ideal.

To fix it, use URI::Heuristic to expand such things into a real url. It
even looks up hostnames in the DNS if necessary.

IkiWiki/Plugin/comments.pm

@@ -198,8 +198,17 @@ sub preprocess {
 			$pagestate{$page}{meta}{author} = $params{claimedauthor};
 		}
 
-		if (defined $params{url} and safeurl($params{url})) {
-			$pagestate{$page}{meta}{authorurl} = $params{url};
+		if (defined $params{url}) {
+			my $url=$params{url};
+
+			eval q{use URI::Heuristic}; 
+		  	if (! $@) {
+				$url=URI::Heuristic::uf_uristr($url);
+			}
+
+			if (safeurl($url)) {
+				$pagestate{$page}{meta}{authorurl} = $url;
+			}
 		}
 	}
 	else {

debian/changelog

@@ -4,6 +4,7 @@ ikiwiki (2.72) UNRELEASED; urgency=low
   * Add deprecation warning for GlobLists, which will stop working in 3.0.
   * camelcase: Add camelcase_ignore setting.
   * googlecalendar: Add runtime deprecation warning.
+  * comments: Deal with users entering unqualified or partial urls.
 
  -- Joey Hess <joeyh@debian.org>  Mon, 22 Dec 2008 19:02:16 -0500