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40 lines
1.2 KiB
Python
40 lines
1.2 KiB
Python
import os
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from watchdog.events import PatternMatchingEventHandler
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from watchdog.observers import Observer
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_observers = {}
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def watch(script, callback):
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if script in _observers:
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raise RuntimeError("Script already observed")
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script_dir = os.path.dirname(os.path.abspath(script.args[0]))
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event_handler = _ScriptModificationHandler(callback)
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observer = Observer()
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observer.schedule(event_handler, script_dir)
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observer.start()
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_observers[script] = observer
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def unwatch(script):
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observer = _observers.pop(script, None)
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if observer:
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observer.stop()
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observer.join()
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class _ScriptModificationHandler(PatternMatchingEventHandler):
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def __init__(self, callback):
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# We could enumerate all relevant *.py files (as werkzeug does it),
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# but our case looks like it isn't as simple as enumerating sys.modules.
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# This should be good enough for now.
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super(_ScriptModificationHandler, self).__init__(
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ignore_directories=True,
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patterns=["*.py"]
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)
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self.callback = callback
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def on_modified(self, event):
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self.callback()
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__all__ = ["watch", "unwatch"] |