setbl

#!/usr/bin/env python
# PYTHON_ARGCOMPLETE_OK
from __future__ import print_function
import os
import  argcomplete, argparse

def main():
    parser = argparse.ArgumentParser(description=" set backlight brightness ")
    group = parser.add_mutually_exclusive_group()
    group.add_argument('brightness',nargs='?', type=int, help=' brightness value (0-100)')
    group.add_argument('-g','--get', action='store_true', help='print current brightness' )

    argcomplete.autocomplete(parser)
    args = parser.parse_args()

    if args.get:
        print('current backlight brightness is: ')
        f = open("/sys/class/backlight/intel_backlight/max_brightness")
        max_brightness = float(f.readline().strip())
        f = open("/sys/class/backlight/intel_backlight/brightness")
        brightness = float(f.readline().strip())
        brightness = round(float(brightness/max_brightness)*100)
        print(int(brightness))
        return

    brightness = args.brightness
    if brightness < 0 or brightness > 100:
        print(" please enter a value between 0-100")
    else:
        f = open("/sys/class/backlight/intel_backlight/max_brightness")
        max_brightness = float(f.readline().strip())
        brightness =  int(float(brightness)/100*max_brightness)
        # print(max_brightness)
        # print(brightness)
        os.system('sudo su -c "echo -n ' + str(brightness) + ' >> /sys/class/backlight/intel_backlight/brightness"')

if __name__ == '__main__':
    main()