Control keyboard color based on active qube label

control-keyboard-color.sh

#!/bin/sh
# vim: et sw=4 ts=4

# Requires https://github.com/MatMoul/g810-led installed in sys-usb (compile it and put into /usr/local/bin for example)
#
# Usage: run in dom0:
# qvm-run --localcmd=./control-keyboard-color.sh --pass-io -- sys-usb 'xargs -n1 g810-led -a'

# in Qubes 4.0, the command from qvm-run argument is ignored with --localcmd
# and we get raw qubes.VMShell, so echo the command on the first line
echo 'xargs -n1 g810-led -a'
# _NET_ACTIVE_WINDOW: window id # 0x4400003, 0x0
xprop -root -notype -spy  _NET_ACTIVE_WINDOW |\
while read _x _x _x _x windowid _x; do
    windowid="${windowid%,}"
    if [ "$windowid" = "0x0" ]; then
        continue
    fi
    # _QUBES_LABEL_COLOR = 7590422
    # _QUBES_LABEL_COLOR:  not found.
    color=$(xprop -notype -id "$windowid" _QUBES_LABEL_COLOR | cut -f 3 -d ' ')
    if [ "$color" = "not" ]; then
        color="16777215"
    fi
    printf '%06x\n' "$color"
done