#!/usr/bin/env dash

# No guarantee that it will be called BAT0, but it suits my purposes.
if ! command -v acpi >/dev/null
then
    >&2 echo "acpi is not installed, battery segment disabled"
    exit
fi
if [ ! -d "/sys/class/power_supply/BAT0" ]
then
    >&2 echo "No battery! This must be a PC"
    exit
fi

while :
do
    BAT=$(acpi --battery)
    PERC=$(echo $BAT | cut -d, -f2)
    echo -n "B${PERC#?}:"
    echo "$BAT" | grep charging >/dev/null && echo "1" || echo "0"
    sleep 15
done