#!/bin/bash

[[ ${BLOCK_INSTANCE} == '' ]] && BATTERY=0 || BATTERY=${BLOCK_INSTANCE}
cat /sys/class/power_supply/BAT${BATTERY}/uevent | gawk -F '=' '
    /POWER_SUPPLY_STATUS=/ {
        status=$2
    }
    /POWER_SUPPLY_ENERGY_FULL=/ {
        efull=$2
    }
    /POWER_SUPPLY_ENERGY_NOW=/ {
        enow=$2
    }
    END {
        charge=enow/efull*100
        if (status == "Discharging") {
            status="↓"
        } else if (status == "Charging") {
            status="↑"
        } else {
            status=""
        }
        printf("%s%d%", status, charge)
        print("\n")
        if (charge < 20) {
            print("#FF0000\n")
        } else if (charge < 40) {
            print("#FFAE00\n")
        } else if (charge < 60) {
            print("#FFF600\n")
        } else if (charge < 85) {
            print("#A8FF00\n")
        } else {
            print("#04B431\n")
        }
        if (charge < 5) {
            exit 33
        }
    }
'