Fix #542

lib/gollum/frontend/helpers.rb

@@ -23,5 +23,12 @@ module Precious
       return url if url.nil?
       url.gsub('%2F','/').gsub(/^\/+/,'')
     end
+
+    def trim_leading_slash url
+      return url if url.nil?
+      url.gsub!('%2F','/')
+      return '/' + url.gsub(/^\/+/,'') if url[0,1] == '/'
+      url
+    end
   end
 end

lib/gollum/markup.rb

@@ -411,7 +411,7 @@ module Gollum
         # //page is invalid
         # strip all duplicate forward slashes using helpers.rb clean_url
         # //page => /page
-        # link = one_leading_slash link
+        link = trim_leading_slash link
 
         %{<a class="internal #{presence}" href="#{link}#{extra}">#{name}</a>}
       end