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#!/usr/bin/env bash
set -euo pipefail
ac_online=$(cat /sys/class/power_supply/AC/online)
if [ "$ac_online" = 1 ]; then
echo "On power"
fi
for bat in /sys/class/power_supply/BAT?; do
energy_full=$(cat "$bat/energy_full")
energy_now=$(cat "$bat/energy_now")
current_charge=$(bc <<<"scale=2; $energy_now / $energy_full * 100")
printf '%s: %.0f%%\n' "$(basename "$bat")" "$current_charge"
done
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