#!/bin/bash
# batt-led - change power button light depending on battery

# blink on $WARN% capacity
WARN=7

led() {
  # 0 = big power button light
  echo 0 $1 >/proc/acpi/ibm/led
}

while sleep 3; do
  if [[ $(</sys/class/power_supply/AC/online) -eq 1 ]]; then
    led on
  elif [[ $(</sys/class/power_supply/BAT0/capacity) -le $WARN ]]; then
    led blink
  else
    led off
  fi
done