Sinatra has taken the stage

lib/will_paginate.rb

@@ -17,3 +17,7 @@ module WillPaginate
     end
   end
 end
+
+if defined?(Sinatra) and Sinatra.respond_to? :register
+  require 'will_paginate/view_helpers/sinatra'
+end

lib/will_paginate/view_helpers/sinatra.rb

@@ -0,0 +1,41 @@
+require 'sinatra/base'
+require 'will_paginate/view_helpers'
+require 'will_paginate/view_helpers/link_renderer'
+
+module WillPaginate
+  module Sinatra
+    module Helpers
+      include ViewHelpers
+
+      def will_paginate(collection, options = {}) #:nodoc:
+        options = options.merge(:renderer => LinkRenderer) unless options[:renderer]
+        super(collection, options)
+      end
+    end
+
+    class LinkRenderer < ViewHelpers::LinkRenderer
+      protected
+
+      def url(page)
+        str = File.join(request.script_name.to_s, request.path_info)
+        params = request.GET.merge(param_name.to_s => page.to_s)
+        params.update @options[:params] if @options[:params]
+        str << '?' << build_query(params)
+      end
+
+      def request
+        @template.request
+      end
+
+      def build_query(params)
+        Rack::Utils.build_nested_query params
+      end
+    end
+
+    def self.registered(app)
+      app.helpers Helpers
+    end
+
+    ::Sinatra.register self
+  end
+end