thinkpad_brigthness.py

#!/usr/bin/python3

import argparse


CURR = "/sys/class/backlight/intel_backlight/brightness"
MAX = "/sys/class/backlight/intel_backlight/max_brightness"

def current_brightness():
    with open(CURR, 'r') as f:
        return int(f.read())

def max_brightness():
    with open(MAX, 'r') as f:
        return int(f.read())

def set_brightness(mode: str, cnt: int):
    up_modes = ['add', 'increase', 'inc', 'up', '+']
    down_modes = ['remove', 'del', 'decrease', 'decr', 'down', 'lower', '-']

    b_curr = current_brightness()
    b_max = max_brightness()

    if mode in up_modes and b_curr != b_max :
        b_new = b_curr + cnt

        if b_new > b_max:
            b_new = b_max

    elif mode in down_modes:
        b_new = b_curr - cnt

        if b_new < 1:
            b_new = 1
    else:
        return

    with open(CURR, 'w') as f:
        f.write(str(b_new))


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Screen brightness manager')
    parser.add_argument('mode', metavar='m', type=str, help='Up/Down')
    parser.add_argument('count', metavar='c', type=int, help='By how much change the brightness setting')
    args = parser.parse_args()

    set_brightness(args.mode, args.count)