require "active_support" require "active_support/file_update_checker" require "active_support/core_ext/array/wrap" module I18n class Railtie < Rails::Railtie config.i18n = ActiveSupport::OrderedOptions.new config.i18n.railties_load_path = [] config.i18n.load_path = [] config.i18n.fallbacks = ActiveSupport::OrderedOptions.new # Set the i18n configuration after initialization since a lot of # configuration is still usually done in application initializers. config.after_initialize do |app| I18n::Railtie.initialize_i18n(app) end # Trigger i18n config before any eager loading has happened # so it's ready if any classes require it when eager loaded config.before_eager_load do |app| I18n::Railtie.initialize_i18n(app) end protected @i18n_inited = false # Setup i18n configuration def self.initialize_i18n(app) return if @i18n_inited fallbacks = app.config.i18n.delete(:fallbacks) app.config.i18n.each do |setting, value| case setting when :railties_load_path app.config.i18n.load_path.unshift(*value) when :load_path I18n.load_path += value else I18n.send("#{setting}=", value) end end init_fallbacks(fallbacks) if fallbacks && validate_fallbacks(fallbacks) reloader = ActiveSupport::FileUpdateChecker.new(I18n.load_path.dup){ I18n.reload! } app.reloaders << reloader ActionDispatch::Reloader.to_prepare { reloader.execute_if_updated } reloader.execute @i18n_inited = true end def self.include_fallbacks_module I18n.backend.class.send(:include, I18n::Backend::Fallbacks) end def self.init_fallbacks(fallbacks) include_fallbacks_module args = case fallbacks when ActiveSupport::OrderedOptions [*(fallbacks[:defaults] || []) << fallbacks[:map]].compact when Hash, Array Array.wrap(fallbacks) else # TrueClass [] end I18n.fallbacks = I18n::Locale::Fallbacks.new(*args) end def self.validate_fallbacks(fallbacks) case fallbacks when ActiveSupport::OrderedOptions !fallbacks.empty? when TrueClass, Array, Hash true else raise "Unexpected fallback type #{fallbacks.inspect}" end end end end