module BootstrapFlashHelper

def bootstrap_flash(options = {})
  flash_messages = []
  flash.each do |type, message|
    # Skip empty messages, e.g. for devise messages set to nothing in a locale file.
    next if message.blank?
    type = type.to_sym
    type = :success if type == :notice
    type = :danger  if type == :alert
    type = :danger  if type == :error
    next unless ALERT_TYPES.include?(type)
    tag_class = options.extract!(:class)[:class]
    tag_options = {
      class: "alert fade in alert-#{type} #{tag_class}"
    }.merge(options)
    close_button = content_tag(:button, raw("×"), type: "button", class: "close", "data-dismiss" => "alert")
    Array(message).each do |msg|
      text = content_tag(:div, close_button + msg, tag_options)
      flash_messages << text if msg
    end
  end
  flash_messages.join("\n").html_safe
end