WillPaginate custom link renderer for twitters bootstrap pagination structure

bootstrap_pagination_renderer.rb

class BootstrapPaginationRenderer < WillPaginate::ViewHelpers::LinkRenderer
  include ActionView::Helpers::UrlHelper

  def to_html
    @current_page = @collection.current_page.to_i

    links = @options[:page_links] ? windowed_links : []

    links.unshift(page_link_or_span(previous_page, 'prev', @options[:previous_label].html_safe))
    links.push(page_link_or_span(next_page, 'next', @options[:next_label].html_safe))

    html = links.join(@options[:separator])
    @template.content_tag(:div, content_tag(:ul, html.html_safe), :class => "pagination")
  end

protected

  def windowed_links
    windowed_page_numbers.map { |n| page_link_or_span(n, (n == current_page ? 'active' : nil)) }
  end

  def page_link_or_span(page, span_class, text = nil)
    text ||= page.to_s
    page_link(page, text, :class => span_class)
  end

  def previous_or_next_page(page, text, classname)
    page || @current_page
  end

  def page_link(page, text, attributes = {})
    @template.content_tag(:li, @template.link_to(text, @template.params.merge("page" => page)), attributes)
  end

  def page_span(page, text, attributes = {})
    @template.content_tag(:li, text, attributes)
  end

end