old_contents: # -*- coding: utf-8 -*-
  
  from bottle import Bottle
  
  
  class BottleCL(object):
      def __init__(self):
          self._app = Bottle()
          self.init_routes()
  
      def init_routes(self):
          pass
  
      def add_route(self, route_path, handler):
          self._app.route(route_path, callback=handler)
  
      def add_error(self, error_code, handler):
          if not self._app.error_handler:
              self._app.error_handler = {error_code: handler}
          else:
              self._app.error_handler[error_code] = handler
  
      def start(self, **kwargs):
          self._app.run(**kwargs)
  
new_contents: # -*- coding: utf-8 -*-
  
  from bottle import Bottle
  
  
  class BottleCL(object):
      def __init__(self):
          self._app = Bottle()
          self.init_routes()
  
      def __call__(self, **kwargs):
          self._app(**kwargs)
  
      def init_routes(self):
          pass
  
      def add_route(self, route_path, handler):
          self._app.route(route_path, callback=handler)
  
      def add_error(self, error_code, handler):
          if not self._app.error_handler:
              self._app.error_handler = {error_code: handler}
          else:
              self._app.error_handler[error_code] = handler
  
      def start(self, **kwargs):
          self._app.run(**kwargs)
  
subject: Implement callable in BottleCL