@dataclass
class Command(object):
    validator = None

    input: list
    channel: str

    @classmethod
    def recognize(cls, event):
        return re.findall(re.compile(cls.validator), event['text'])

    def do(self):
        raise NotImplementedError()


class HelpCommand(Command):
    validator = 'help'

    def do(self):
        slack_client.api_call(
            "chat.postMessage",
            channel=self.channel,
            text="""
                Here are some things I can do:
                    - type help to see this message
                    - type "Standup for: <comma separated members list>" to start recording the standup
                """
        )