epynotify.py

#-*- coding:utf-8 -*-
import os.path
import datetime
import pynotify
import collections #namedtuple

DEFAULT_TITLE = 'Hello, World!'
DEFAULT_MESSAGE = ''
DIR =  os.path.dirname(os.path.abspath(__file__))
DEFAULT_IMAGE = os.path.join(DIR, "attention.png")

ActionState = collections.namedtuple('ActionState', 'title message image')

class ActionHandler:
    def __init__(self, *action_clses):
        self.queue = list(action_clses)

    def add(self, action_cls):
        self.queue.append(action_cls)
        return self # for method chainnig
        
    def run(self,state, clean=False):
        for action_cls in self.queue:
            action_cls(state).run()
        if  clean:
            self.queue = []

class Action:
    def __init__(self, state):
        self.state = state
        self.varidate()
        
    def varidate(self):
        state = self.state
        for attr in ("image", "message", "title"):
            if not getattr(state, attr):
                raise NotImplemented(attr)

class NotifyAction(Action):
    def __init__(self, state):
        Action.__init__(self, state)

    def run(self):
        """ show Notification """
        state = self.state
        pynotify.init(state.title)
        notfy = pynotify.Notification(state.title, state.message, state.image)
        notfy.show()

class MessageAction(Action):
    def __init__(self, state):
        Action.__init__(self, state)

    def run(self):
        state = self.state
        dt = datetime.datetime.now()
        if not state.message:
            print('*' * 80)
            print('\t{0}\n'.format(state.title))
        else:
            print('*' * 80)
            print('\t{0}\n\t{1}\n'.format(state.title, state.message))
            print('{year}/{month:#02d}/{day:#02d} '
                  '[{hour:#02d}:{minute:#02d}:{second:#02d}]'.format(
                    year=dt.year, month=dt.month, day=dt.day, hour=dt.hour,
                    minute=dt.minute, second=dt.second))
            print('*' * 80)

def demo():
    from time import sleep
    ach = ActionHandler(NotifyAction)
    arg = ActionState(title="test", message="Hello, World", image=DEFAULT_IMAGE)
    ach.run(arg)
    sleep(5)
    ach.add(MessageAction)
    ach.run(ActionState(title="test", message="test", image=DEFAULT_IMAGE))
    sleep(5)

if __name__ == '__main__':
    demo()

ほんとうは、default値を指定して省略していきたいのだけれど。propertyとか弄っていけば良いのかな？