auto_link (ActionView::Helpers::TextHelper)

    # File lib/action_view/helpers/text_helper.rb, line 384
          def auto_link(text, *args, &block)#link = :all, href_options = {}, &block)
            return '' if text.blank?

            options = args.size == 2 ? {} : args.extract_options! # this is necessary because the old auto_link API has a Hash as its last parameter
            unless args.empty?
              options[:link] = args[0] || :all
              options[:html] = args[1] || {}
            end
            options.reverse_merge!(:link => :all, :html => {})

            case options[:link].to_sym
              when :all                         then auto_link_email_addresses(auto_link_urls(text, options[:html], &block), &block)
              when :email_addresses             then auto_link_email_addresses(text, &block)
              when :urls                        then auto_link_urls(text, options[:html], &block)
            end
          end