How to save on shutdown or KeyboardInterrupt

[wheelercj]

I had a need to save to a file when my app closed no matter why it closed. The solution I found (with Textual 0.1.15 on Windows) was not what I first expected would work, so here it is in case it helps others.

class MyApp(textual.app.App):
    
    . . .

    async def shutdown(self):
        self.my_save()
        await super().shutdown()

The same seems to work with close_all instead of shutdown. Defining a __del__ method did not work for some reason, and any exceptions raised in the app will not make it out of MyApp.run(), so it seems a try-except block is not an option either.

Hope this helps!