Bootstrap 3 compatible breadcrumbs builder for breadcrumbs_on_rails gem.

bootstrap_breadcrumbs_builder.rb

# You can use it with the :builder option on render_breadcrumbs:
#     <%= render_breadcrumbs :builder => ::BootstrapBreadcrumbsBuilder %>
#
# Note: You may need to adjust the autoload_paths in your config/application.rb file for rails to load this class:
#     config.autoload_paths += Dir["#{config.root}/lib/"]
#
class BootstrapBreadcrumbsBuilder < BreadcrumbsOnRails::Breadcrumbs::Builder
  def render
    return '' if @elements.empty?
    @context.content_tag :ol, class: 'breadcrumb' do
      @elements.collect do |element|
        render_element element
      end.join("\n").html_safe
    end
  end

  def render_element element
    current = @context.current_page? compute_path(element)
    @context.content_tag :li, class: ('active' if current) do
      @context.link_to_unless_current compute_name(element), compute_path(element), element.options
    end
  end
end