fix generation of page URLs that contain the "@" character

before, "/blogs/@Andrex/page/2" would be generated like "/blogs/2Andrex/page/@"
[mislav#262 state:resolved]

lib/will_paginate/view_helpers.rb

@@ -332,21 +332,21 @@ def url_for(page)
         return url if page_one
 
         if complex
-          @url_string = url.sub(%r!((?:\?|&)#{CGI.escape param_name}=)#{page}!, '\1@')
+          @url_string = url.sub(%r!((?:\?|&)#{CGI.escape param_name}=)#{page}!, "\\1\0")
           return url
         else
           @url_string = url
           @url_params[param_name] = 3
           @template.url_for(@url_params).split(//).each_with_index do |char, i|
             if char == '3' and url[i, 1] == '2'
-              @url_string[i] = '@'
+              @url_string[i] = "\0"
               break
             end
           end
         end
       end
       # finally!
-      @url_string.sub '@', page.to_s
+      @url_string.sub "\0", page.to_s
     end
 
   private

test/view_test.rb

@@ -277,6 +277,14 @@ def test_will_paginate_with_custom_page_param
       end
     end    
   end
+
+  def test_will_paginate_with_atmark_url
+    @request.symbolized_path_parameters[:action] = "@tag"
+    renderer = WillPaginate::LinkRenderer.new
+
+    paginate({ :page => 1 }, :renderer=>renderer)
+    assert_links_match %r[/foo/@tag\?page=\d]
+  end
 
   def test_complex_custom_page_param
     @request.params :developers => { :page => 2 }