class Rails::Application::RoutesReloader

def clear!
  route_sets.each do |routes|
    routes.disable_clear_and_finalize = true
    routes.clear!
  end
end

def execute
  @loaded = true
  updater.execute
end

def execute_unless_loaded
  unless @loaded
    execute
    ActiveSupport.run_load_hooks(:after_routes_loaded, Rails.application)
    true
  end
end

def finalize!
  route_sets.each(&:finalize!)
end

def initialize
  @paths      = []
  @route_sets = []
  @external_routes = []
  @eager_load = false
  @loaded = false
end

def load_paths
  paths.each { |path| load(path) }
  run_after_load_paths.call
end

def reload!
  clear!
  load_paths
  finalize!
  route_sets.each(&:eager_load!) if eager_load
ensure
  revert
end

def revert
  route_sets.each do |routes|
    routes.disable_clear_and_finalize = false
  end
end

def run_after_load_paths
  @run_after_load_paths ||= -> { }
end

def updater
  @updater ||= begin
    dirs = @external_routes.each_with_object({}) do |dir, hash|
      hash[dir.to_s] = %w(rb)
    end
    ActiveSupport::FileUpdateChecker.new(paths, dirs) { reload! }
  end
end