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Diffstat (limited to 'railties/lib/rails/engine.rb')
-rw-r--r-- | railties/lib/rails/engine.rb | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/railties/lib/rails/engine.rb b/railties/lib/rails/engine.rb new file mode 100644 index 0000000000..21c78036bd --- /dev/null +++ b/railties/lib/rails/engine.rb @@ -0,0 +1,107 @@ +require 'active_support/core_ext/module/delegation' + +module Rails + # TODO Move I18n and views path setup + class Engine < Railtie + + class << self + attr_accessor :called_from + + def root + @root ||= find_root_with_file_flag("lib") + end + + def config + @config ||= Configuration.new(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 :root, :config, :to => :'self.class' + delegate :middleware, :to => :config + + # Add configured load paths to ruby load paths and remove duplicates. + initializer :set_load_path, :before => :container do + config.paths.add_to_load_path + $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 + + initializer :load_application_initializers do + Dir["#{root}/config/initializers/**/*.rb"].sort.each do |initializer| + load(initializer) + end + end + + # Routing must be initialized after plugins to allow the former to extend the routes + initializer :initialize_routing do |app| + app.route_configuration_files.concat(config.paths.config.routes.to_a) + 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 expand_load_path(load_paths) + load_paths.map { |path| Dir.glob(path.to_s) }.flatten.uniq + end + end +end
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