fake-backlight-helper.py

#! /usr/bin/env python
# -*- coding: utf-8; indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
#
# Copyright (C) 2014 Shih-Yuan Lee (FourDollars) <sylee@canonical.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import argparse
import subprocess
import syslog

CMD='/usr/lib/unity-settings-daemon/usd-backlight-helper.orig'

def set_brightness(brightness):
    maximum = int(subprocess.check_output([CMD, '--get-max-brightness']).strip())
    step = maximum / 100
    delta = maximum - step * 100
    pseudo = brightness * step + delta
    subprocess.call([CMD, '--set-brightness', str(pseudo)])
    syslog.syslog("Set %d" % pseudo)

def get_max_brightness():
    print("100")
    syslog.syslog("Max 100")

def get_brightness():
    maximum = int(subprocess.check_output([CMD, '--get-max-brightness']).strip())
    step = maximum / 100
    delta = maximum - step * 100
    brightness = int(subprocess.check_output([CMD, '--get-brightness']).strip())
    pseudo = (brightness - delta) / step
    print("%d" % pseudo)
    syslog.syslog("Get %d" % pseudo)

def main():
    """
Usage:
  fake-backlight-helper [OPTION...]

FAKE Settings Daemon Backlight Helper

Help Options:
  -h, --help               Show help options

Application Options:
  --set-brightness         Set the current brightness
  --get-brightness         Get the current brightness
  --get-max-brightness     Get the number of brightness levels supported
  """
    parser = argparse.ArgumentParser(description="FAKE Settings Daemon Backlight Helper")
    parser.add_argument("--get-brightness", help="Get the current brightness", action="store_true")
    parser.add_argument("--get-max-brightness", help="Get the number of brightness levels supported", action="store_true")
    parser.add_argument("--set-brightness", help="Set the current brightness", type=int)
    args = parser.parse_args()
    if args.get_max_brightness:
        get_max_brightness()
    elif args.get_brightness:
        get_brightness()
    elif args.set_brightness is not None:
        set_brightness(args.set_brightness)
    else:
        parser.print_help()

if __name__ == '__main__':
    main()

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