#!/bin/sh
# Print the charge % of the first real battery. Portable across machines
# (macsmc-battery on Asahi, BAT0/BAT1 on x86).
for d in /sys/class/power_supply/*; do
  [ "$(cat "$d/type" 2>/dev/null)" = "Battery" ] || continue
  cat "$d/capacity" 2>/dev/null && exit 0
done
echo "?"