facematcher/facewaiter.py

#!/usr/bin/env python

import subprocess

keyboard = "AT Translated Set 2 keyboard"
battery = "/sys/class/power_supply/BAT0"
device = "2"
faces = "faces"
key = "36"

bat = False
if battery is not None:
    with open(f"{battery}/status", "r") as f:
        s = f.read().strip()
        if s == "Discharging" or s == "Unknown":
            bat = True

print("starting facematcher")
proc = subprocess.Popen(
    f"./facematcher.py match --wait --delay 500 --device {device} {faces}/$USER/*",
    stdin=subprocess.PIPE, shell=True)

if bat:
    print(f"On battery, so waiting for {key}")
    subprocess.check_output(
        f"xinput test '{keyboard}' | grep --line-buffered 'key press   {key}' | exit",
        shell=True)
    print(f"Got {key}.")

proc.stdin.write(b"hello\n")
proc.stdin.flush()
exit(proc.wait())