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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
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