#! /usr/bin/env python3
"""Grabs the respective device to discard any input from it."""

from configparser import ConfigParser
from contextlib import suppress
from subprocess import run
from threading import Thread


CONFIG_FILE = '/etc/tablet-mode.conf'
EVTEST = '/usr/bin/evtest'


def grab_device(device):
    """Grabs the respective device via evtest."""

    return run((EVTEST, '--grab', device))


def get_devices():
    """Reads the device from the config file."""

    parser = ConfigParser()
    parser.read(CONFIG_FILE)

    with suppress(KeyError):
        yield parser['Devices']['keyboard']

    with suppress(KeyError):
        yield parser['Devices']['touchpad']


def disable_devices(devices):
    """Disables the given devices."""

    threads = []

    for device in devices:
        thread = Thread(target=grab_device, args=[device])
        threads.append(thread)
        thread.start()

    for thread in threads:
        thread.join()


if __name__ == '__main__':
    disable_devices(get_devices())