bin_launch.py

@cli.command()
def app():
    from profile_list.app import app
    from profile_list.assets import compile_stylus, css_path
    import logging
    from watchdog.observers import Observer
    from watchdog.events import PatternMatchingEventHandler, LoggingEventHandler

    logging.basicConfig(level=logging.INFO,
                        format='%(asctime)s - %(message)s',
                        datefmt='%Y-%m-%d %H:%M:%S')

    class StylusCompilerHandler(PatternMatchingEventHandler):
        def __init__(self):
            super().__init__(patterns=['*.styl'])

        def on_created(self, _):
            compile_stylus()

        def on_modified(self, _):
            compile_stylus()

    observer = Observer()
    handler = StylusCompilerHandler()
    observer.schedule(handler, css_path, recursive=True)
    observer.schedule(LoggingEventHandler(), css_path, recursive=True)
    observer.start()
    app.run()
    observer.stop()
    observer.join()