#!/usr/bin/env bash
# Battery status for the hyprlock screen, e.g. "  18%".
# Uses the first battery found under /sys/class/power_supply (BAT0/BAT1, ...);
# prints nothing on desktops without a battery.
set -u

bat=""
for b in /sys/class/power_supply/BAT*; do
    if [ -r "${b}/capacity" ]; then
        bat="${b}"
        break
    fi
done

[ -z "${bat}" ] && exit 0

cap="$(cat "${bat}/capacity" 2>/dev/null || echo 0)"
status="$(cat "${bat}/status" 2>/dev/null || echo Unknown)"

case "${status}" in
    Charging|Full)
        icon=""
        ;;
    *)
        if [ "${cap}" -ge 80 ]; then
            icon=""
        elif [ "${cap}" -ge 60 ]; then
            icon=""
        elif [ "${cap}" -ge 40 ]; then
            icon=""
        elif [ "${cap}" -ge 20 ]; then
            icon=""
        else
            icon=""
        fi
        ;;
esac

printf '%s  %s%%' "${icon}" "${cap}"