Works with Bootstrap 3 and Will_paginate 3.0.4 and Sinatra

will_paginate.rb

# gist https://gist.github.com/expertmind/6410029
# Based on https://gist.github.com/isaacbowen/1182136

module WillPaginate
  module Sinatra

    module Helpers
      include ViewHelpers

      def will_paginate(collection, options = {}) #:nodoc:
        options = options.merge(:renderer => BootstrapLinkRenderer) unless options[:renderer]
        super(collection, options)
      end
    end

    class BootstrapLinkRenderer < LinkRenderer 
      protected
      
      def html_container(html)
        tag :ul, html, container_attributes
      end
      
      def page_number(page)
        tag :li, link(page, page, :rel => rel_value(page)), :class => ('active' if page == current_page)
      end
      
      def previous_or_next_page(page, text, classname)
        tag :li, link(text, page || '#'), :class => [classname[0..3], classname, ('disabled' unless page)].join(' ')
      end
      
      def gap
        tag :li, link(super, '#'), :class => 'disabled'
      end      
    end
  end
end