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#!/usr/bin/python3
import libevdev
import sys
def toggle(path, ledstr):
ledmap = {
"numlock": (libevdev.LED_NUML, libevdev.KEY_NUMLOCK),
"capslock": (libevdev.LED_CAPSL, libevdev.KEY_CAPSLOCK),
"scrolllock": (libevdev.LED_SCROLLL, libevdev.KEY_SCROLLLOCK),
}
if ledstr not in ledmap:
print(
'Unknown LED: "{}". Use one of "{}".'.format(
ledstr, '", "'.join(ledmap.keys())
)
)
sys.exit(1)
led, key = ledmap[ledstr]
with open(path, "r+b", buffering=0) as fd:
d = libevdev.Device(fd)
if not d.has(led):
print("Device does not have a {} LED".format(ledstr))
sys.exit(0)
if not d.has(key):
print("Device does not have a {} key".format(ledstr))
sys.exit(0)
state = d.value[key]
print("{} {}".format(ledstr, "on" if state else "off"))
while True:
for e in d.events():
if not e.matches(key):
continue
if not e.value:
continue
state = not state
d.set_leds([(led, state)])
print("{} {}".format(ledstr, "on" if state else "off"))
if __name__ == "__main__":
if len(sys.argv) < 3:
print(
"Usage: {} /dev/input/eventX {{numlock|capslock|scrolllock}}".format(
sys.argv[0]
)
)
sys.exit(1)
path = sys.argv[1]
ledstr = sys.argv[2]
try:
toggle(path, ledstr)
except KeyboardInterrupt:
pass
except IOError as e:
import errno
if e.errno == errno.EACCES:
print("Insufficient permissions to access {}".format(path))
elif e.errno == errno.ENOENT:
print("Device {} does not exist".format(path))
else:
raise e
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