inline: Handle obfuscated urls, such as the mailto urls generated by markdown when forcing urls absolute.

That took me 5 minutes. If anyone thinks obfuscated email urls stops, or
even slows down spammers, think again.

IkiWiki/Plugin/inline.pm

@@ -564,13 +564,15 @@ sub absolute_urls ($$) {
 				next unless $v_offset; # 0 v_offset means no value
 				my $v = substr($text, $v_offset, $v_len);
 				$v =~ s/^([\'\"])(.*)\1$/$2/;
-				if ($v=~/^#/) {
+				eval q{use HTML::Entities};
+				my $dv = decode_entities($v);
+				if ($dv=~/^#/) {
 					$v=$baseurl.$v; # anchor
 				}
-				elsif ($v=~/^(?!\w+:)[^\/]/) {
+				elsif ($dv=~/^(?!\w+:)[^\/]/) {
 					$v=$url.$v; # relative url
 				}
-				elsif ($v=~/^\//) {
+				elsif ($dv=~/^\//) {
 					if (! defined $urltop) {
 						# what is the non path part of the url?
 						my $top_uri = URI->new($url);

debian/changelog

@@ -27,6 +27,8 @@ ikiwiki (3.20110609) UNRELEASED; urgency=low
     fixes sorting comments by date. (smcv)
   * Run scan hooks for internal pages (preprocess hooks already run in scan
     mode) (smcv)
+  * inline: Handle obfuscated urls, such as the mailto urls generated by
+    markdown when forcing urls absolute.
 
  -- Joey Hess <joeyh@debian.org>  Thu, 09 Jun 2011 10:06:44 -0400
 

doc/bugs/mailto:_links_not_properly_generated_in_rssatom_feeds.mdwn

@@ -17,4 +17,13 @@ for HTML, but
 
 for Atom and RSS.
 
-    
+> This garbling is provably pointless. Proof: For $1000 I will take off my
+> white hat, put on my black hat, and implement support for it in any
+> spammer's email address extraction tool. Money will be donated to a
+> spam-fighting organisation of my choice.
+> 
+> So, in leu of money, it seems best to find a way to disable it in
+> markdown.
+> 
+> Anyway, I've fixed this, at the expense of additional total worldwide
+> power usage, etc. --[[Joey]]