import npyscreen


class App(npyscreen.NPSApp):
    def main(self):
        form = npyscreen.FormBaseNew(name='EKOiE')
        form.add_widget(npyscreen.TitleSelectOne, name='Track number', values=[1, 2, 3, 4, 5])
        form.edit()


if __name__ == '__main__':
    app = App()
    app.run()

from contextlib import contextmanager
import os
import sys

import npyscreen


@contextmanager
def use_xterm():
    """Helper setting proper TERM value

    Required for colors to work under 16-color tmux.
    """
    old_value = os.environ.get('TERM')
    os.environ['TERM'] = 'xterm'
    yield
    if old_value is not None:
        os.environ['TERM'] = old_value


def quit():
    """Close application gracefully"""
    sys.exit(0)


class QuitPopup(npyscreen.ActionPopup):
    """Popup used for exiting the app"""
    def on_ok(self):
        self.parentApp.setNextForm(None)

    def on_cancel(self):
        self.parentApp.switchFormPrevious()


class MyForm(npyscreen.FormBaseNew):
    def h_quit(self, key):
        self.parentApp.switchForm('quit_popup')

    def set_up_handlers(self):
        super(MyForm, self).set_up_handlers()
        keys = {
            'q': self.h_quit,
        }
        # Make upperkeys available, too!
        for key, func in list(keys.items()):
            keys[key.upper()] = func
        self.handlers.update(keys)


class App(npyscreen.NPSAppManaged):
    def onStart(self):
        form = self.addForm('MAIN', MyForm, name='EKOiE')
        form.add_widget(
            npyscreen.TitleSelectOne,
            name='Track number',
            values=[1, 2, 3, 4, 5],
        )

        quit_popup = self.addForm(
            'quit_popup',
            QuitPopup,
            name='Really quit?',
            lines=5,
        )
        quit_popup.show_atx = 40
        quit_popup.show_aty = 20

        self.setNextForm('MAIN')


if __name__ == '__main__':
    with use_xterm():
        app = App()
        try:
            app.run()
        except KeyboardInterrupt:
            quit()

Quit popup, NPSAppManaged and TERM
Quit popup, NPSAppManaged and TERM

Main class (App) now extends NPSAppManaged, and forms are added in
kosher way. Quit popup is also implemented and available upon
pressing `q` key (`Q` key too!).

Additionally, application sets TERM env variable to proper value
(`xterm`) in order for colors to properly show up under tmux.
