#!/bin/bash
set -euo pipefail

SYM_ADAPTER="⚡️"
SYM_BATTERY="🔋"
BATTERY=/sys/class/power_supply/BAT0
AC=/sys/class/power_supply/AC

[ -e ${BATTERY} ] || { echo "No battery" >&2; exit 0; }
[ -e ${AC} ] || { echo "No ac" >&2; exit 0; }

CAPACITY=$(cat ${BATTERY}/capacity)
AC_CONNECT=$(cat ${AC}/online)

if [ ${AC_CONNECT} -eq 0 ]; then
  SYM=${SYM_BATTERY}
else
  SYM=${SYM_ADAPTER}
fi

echo "${SYM} ${CAPACITY}%"