#!/bin/sh -e

limit=${1:-18}
acpi=$(acpi -b)
acpi_status=$(echo "$acpi" | awk -F ': |,' {'print $2'})

[ "$acpi_status" == "Discharging" ] &&
	acpi_value=$(echo "$acpi" | awk -F ", " {'print $2'} | sed 's/%//') &&
	[ "$acpi_value" -lt "$limit" ] &&
		export DISPLAY=:0.0 &&
		notify-send -u critical "Battery charge at $acpi_value%"
exit 0