File: suspend.py

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from os import system

from textual import on
from textual.app import App, ComposeResult
from textual.widgets import Button


class SuspendingApp(App[None]):

    def compose(self) -> ComposeResult:
        yield Button("Open the editor", id="edit")

    @on(Button.Pressed, "#edit")
    def run_external_editor(self) -> None:
        with self.suspend():  # (1)!
            system("vim")


if __name__ == "__main__":
    SuspendingApp().run()