require 'action_view/helpers/tag_helper' require 'i18n/exceptions' module I18n class ExceptionHandler include Module.new { def call(exception, locale, key, options) exception.is_a?(MissingTranslation) ? super.html_safe : super end } end end module ActionView # = Action View Translation Helpers module Helpers module TranslationHelper # Delegates to I18n#translate but also performs three additional functions. # # First, it'll pass the :rescue_format => :html option to I18n so that any # thrown MissingTranslation messages will be turned into inline spans that # # * have a "translation-missing" class set, # * contain the missing key as a title attribute and # * a titleized version of the last key segment as a text. # # E.g. the value returned for a missing translation key :"blog.post.title" will be # Title. # This way your views will display rather reasonable strings but it will still # be easy to spot missing translations. # # Second, it'll scope the key by the current partial if the key starts # with a period. So if you call translate(".foo") from the # people/index.html.erb template, you'll actually be calling # I18n.translate("people.index.foo"). This makes it less repetitive # to translate many keys within the same partials and gives you a simple framework # for scoping them consistently. If you don't prepend the key with a period, # nothing is converted. # # Third, it'll mark the translation as safe HTML if the key has the suffix # "_html" or the last element of the key is the word "html". For example, # calling translate("footer_html") or translate("footer.html") will return # a safe HTML string that won't be escaped by other HTML helper methods. This # naming convention helps to identify translations that include HTML tags so that # you know what kind of output to expect when you call translate in a template. def translate(key, options = {}) options.merge!(:rescue_format => :html) unless options.key?(:rescue_format) translation = I18n.translate(scope_key_by_partial(key), options) if html_safe_translation_key?(key) && translation.respond_to?(:html_safe) translation.html_safe else translation end end alias :t :translate # Delegates to I18n.localize with no additional functionality. def localize(*args) I18n.localize(*args) end alias :l :localize private def scope_key_by_partial(key) if key.to_s.first == "." if @virtual_path @virtual_path.gsub(%r{/_?}, ".") + key.to_s else raise "Cannot use t(#{key.inspect}) shortcut because path is not available" end else key end end def html_safe_translation_key?(key) key.to_s =~ /(\b|_|\.)html$/ end end end end