def http_url(full_name, prefix)
      path = full_name.dup
      path.gsub!(/<<\s*(\w*)/) { "from-#$1" } if path['<<']
      File.join(prefix, path.split("::").collect { |p| Digest::MD5.hexdigest(p) }) + ".html"
    end
def http_url(full_name, prefix)
      path = full_name.dup
      path.gsub!(/<<\s*(\w*)/) { "from-#$1" } if path['<<']
      File.join(prefix, path.split("::").collect { |p| Digest::MD5.hexdigest(p) }) + ".html"
    end
return the relative file name to store this class in,
 which is also its url