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require 'active_support/core_ext/module/delegation'
module Rails
# TODO Move I18n here
# TODO Set routes namespaces
class Engine < Railtie
class << self
attr_accessor :called_from
def original_root
@original_root ||= find_root_with_file_flag("lib")
end
def config
@config ||= Configuration.new(original_root)
end
def inherited(base)
base.called_from = begin
call_stack = caller.map { |p| p.split(':').first }
File.dirname(call_stack.detect { |p| p !~ %r[railties/lib/rails|rack/lib/rack] })
end
super
end
protected
def find_root_with_file_flag(flag, default=nil)
root_path = self.called_from
while root_path && File.directory?(root_path) && !File.exist?("#{root_path}/#{flag}")
parent = File.dirname(root_path)
root_path = parent != root_path && parent
end
root = File.exist?("#{root_path}/#{flag}") ? root_path : default
raise "Could not find root path for #{self}" unless root
RUBY_PLATFORM =~ /(:?mswin|mingw)/ ?
Pathname.new(root).expand_path :
Pathname.new(root).realpath
end
end
delegate :config, :to => :'self.class'
delegate :middleware, :root, :to => :config
# Add configured load paths to ruby load paths and remove duplicates.
initializer :set_load_path, :before => :container do
expand_load_path(config.load_paths).reverse_each do |path|
$LOAD_PATH.unshift(path) if File.directory?(path)
end
$LOAD_PATH.uniq!
end
# Set the paths from which Rails will automatically load source files,
# and the load_once paths.
initializer :set_autoload_paths, :before => :container do
require 'active_support/dependencies'
ActiveSupport::Dependencies.load_paths = expand_load_path(config.load_paths)
ActiveSupport::Dependencies.load_once_paths = expand_load_path(config.load_once_paths)
extra = ActiveSupport::Dependencies.load_once_paths -
ActiveSupport::Dependencies.load_paths
unless extra.empty?
abort <<-end_error
load_once_paths must be a subset of the load_paths.
Extra items in load_once_paths: #{extra * ','}
end_error
end
# Freeze the arrays so future modifications will fail rather than do nothing mysteriously
config.load_once_paths.freeze
end
# Routing must be initialized after plugins to allow the former to extend the routes
initializer :add_routing_files do |app|
routes = select_existing(config.paths.config.routes)
app.route_configuration_files.concat(routes)
end
initializer :add_view_paths do
views = select_existing(config.paths.app.views)
ActionController::Base.view_paths.concat(views) if defined? ActionController
ActionMailer::Base.view_paths.concat(views) if defined? ActionMailer
end
initializer :load_application_initializers do
select_existing(config.paths.config.initializers).each do |initializers|
Dir["#{initializers}/**/*.rb"].sort.each do |initializer|
load(initializer)
end
end
end
# Eager load application classes
initializer :load_application_classes do |app|
next if $rails_rake_task
if app.config.cache_classes
config.eager_load_paths.each do |load_path|
matcher = /\A#{Regexp.escape(load_path)}(.*)\.rb\Z/
Dir.glob("#{load_path}/**/*.rb").sort.each do |file|
require_dependency file.sub(matcher, '\1')
end
end
end
end
private
def select_existing(paths)
paths.to_a.select { |path| File.exists?(path) }.uniq
end
def expand_load_path(load_paths)
load_paths.map { |path| Dir.glob(path.to_s) }.flatten.uniq
end
end
end
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