require 'action_view/helpers/tag_helper' module ActionView module Helpers module TranslationHelper # Delegates to I18n#translate but also performs three additional functions. First, it'll catch MissingTranslationData exceptions # and turn them into inline spans that contains the missing key, such that you can see in a view what is missing where. # # 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[:raise] = true translation = I18n.translate(scope_key_by_partial(key), options) translation = (translation.respond_to?(:join) ? translation.join : translation) if html_safe_translation_key? key translation.html_safe else translation end rescue I18n::MissingTranslationData => e keys = I18n.normalize_keys(e.locale, e.key, e.options[:scope]) content_tag('span', keys.join(', '), :class => 'translation_missing') 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) strkey = key.respond_to?(:join) ? key.join : key.to_s if strkey.first == "." if @_virtual_path @_virtual_path.gsub(%r{/_?}, ".") + strkey else raise "Cannot use t(#{key.inspect}) shortcut because path is not available" end else key end end def html_safe_translation_key?(key) last_key = if key.is_a? Array key.last else key.to_s.split('.').last end (last_key == "html") || (last_key.ends_with? "_html") end end end end