Use default screen

[davidfokkema]

Simple Textual apps place a lot of logic in the App class, but you can also
use a Screen as the main screen. This example shows how to do that, and how to
push modal screens from the main screen, and show a modal confirmation screen
when quitting the app. You'll never leave the main screen until you quit the
application, but you can still use the App class to manage a (few)
application-wide bindings.

[edward-jazzhands]

Looks awesome. Just need one small change, need a main guard on the script. My apologies for not having a contribution guide already to explain this. Just add this to the bottom, as well as import sys:

if __name__ == "__main__":
    app = MainApp()
    app.run()
    sys.exit(app.return_code)

The main guard itself is required for the pytest validation to work, while the sys.exit thing makes the scripts return an error code to the recipe runner if a script crashes (Textual apps don't do this by default). Which of course you would never see for working scripts, but it makes it easier to play around with them, etc. Its meant to be a convenience for people using the cookbook. I need to write this all out in a contribution guide very soon.

[davidfokkema]

Of course!

[edward-jazzhands]

perfect