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) # Avoid issues with setting the default_locale by disabling available locales # check while configuring. enforce_available_locales = app.config.i18n.delete(:enforce_available_locales) enforce_available_locales = I18n.enforce_available_locales if enforce_available_locales.nil? I18n.enforce_available_locales = false reloadable_paths = [] app.config.i18n.each do |setting, value| case setting when :railties_load_path reloadable_paths = value app.config.i18n.load_path.unshift(*value.map(&:existent).flatten) when :load_path I18n.load_path += value else I18n.send("#{setting}=", value) end end init_fallbacks(fallbacks) if fallbacks && validate_fallbacks(fallbacks) # Restore available locales check so it will take place from now on. I18n.enforce_available_locales = enforce_available_locales directories = watched_dirs_with_extensions(reloadable_paths) reloader = app.config.file_watcher.new(I18n.load_path.dup, directories) do I18n.load_path.keep_if { |p| File.exist?(p) } I18n.load_path |= reloadable_paths.map(&:existent).flatten I18n.reload! end app.reloaders << reloader app.reloader.to_run do reloader.execute_if_updated { require_unload_lock! } # TODO: remove the following line as soon as the return value of # callbacks is ignored, that is, returning `false` does not # display a deprecation warning or halts the callback chain. true end reloader.execute @i18n_inited = true end def self.include_fallbacks_module I18n.backend.class.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 def self.watched_dirs_with_extensions(paths) paths.each_with_object({}) do |path, result| result[path.absolute_current] = path.extensions end end end end