import os import sys from watchdog.events import RegexMatchingEventHandler if sys.platform == 'darwin': from watchdog.observers.polling import PollingObserver as Observer else: from watchdog.observers import Observer # The OSX reloader in watchdog 0.8.3 breaks when unobserving paths. # We use the PollingObserver instead. _observers = {} def watch(script, callback): if script in _observers: raise RuntimeError("Script already observed") script_dir = os.path.dirname(os.path.abspath(script.args[0])) script_name = os.path.basename(script.args[0]) event_handler = _ScriptModificationHandler(callback, filename=script_name) observer = Observer() observer.schedule(event_handler, script_dir) observer.start() _observers[script] = observer def unwatch(script): observer = _observers.pop(script, None) if observer: observer.stop() observer.join() class _ScriptModificationHandler(RegexMatchingEventHandler): def __init__(self, callback, filename='.*'): super(_ScriptModificationHandler, self).__init__( ignore_directories=True, regexes=['.*'+filename] ) self.callback = callback def on_modified(self, event): self.callback() __all__ = ["watch", "unwatch"]