module ActiveSupport::Autoload

def self.extended(base) # :nodoc:
  base.class_eval do
    @_autoloads = {}
    @_under_path = nil
    @_at_path = nil
    @_eager_autoload = false
  end
end

def autoload(const_name, path = @_at_path)
  unless path
    full = [name, @_under_path, const_name.to_s].compact.join("::")
    path = Inflector.underscore(full)
  end
  if @_eager_autoload
    @_autoloads[const_name] = path
  end
  super const_name, path
end

def autoload_at(path)
  @_at_path, old_path = path, @_at_path
  yield
ensure
  @_at_path = old_path
end

def autoload_under(path)
  @_under_path, old_path = path, @_under_path
  yield
ensure
  @_under_path = old_path
end

def autoloads
  @_autoloads
end

def eager_autoload
  old_eager, @_eager_autoload = @_eager_autoload, true
  yield
ensure
  @_eager_autoload = old_eager
end

def eager_load!
  @_autoloads.each_value { |file| require file }
end