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#!/usr/bin/python3
import notify2
import os
import subprocess
import sys
if len(sys.argv) < 2:
sys.stdout.write('Usage: %s /sys/.../<backlight dir>/\n')
sys.exit(0)
path = sys.argv[1]
with open(os.path.join(path, 'max_brightness'), 'r') as f:
brightness_max = float(f.read().strip())
notify2.init(os.path.basename(sys.argv[0]))
notification = notify2.Notification('Brightness')
inotify_cmd = ['inotifywait', '--monitor', '--event=close_write',
os.path.join(path, 'brightness')]
child = subprocess.Popen(inotify_cmd, stdout = subprocess.PIPE, bufsize = 0)
while True:
# wait for updates
child.stdout.read(4096)
if child.poll() is not None:
notification.message = 'inotify monitor has terminated'
notification.set_urgency(notify2.URGENCY_CRITICAL)
notification.show()
sys.stderr.write(notification.message + '\n')
break
with open(os.path.join(path, 'brightness'), 'r') as f:
brightness = float(f.read().strip())
notification.message = '%d%%' % (100 * brightness / brightness_max)
notification.show()
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