#!/bin/bash

charge_now=$(cat /sys/class/power_supply/BAT0/charge_now)
charge_full=$(cat /sys/class/power_supply/BAT0/charge_full)

# https://github.com/torvalds/linux/blob/7e6739b9336e61fe23ca4e2c8d1fda8f19f979bf/Documentation/ABI/testing/sysfs-class-power
# line 463
# Unknown, Full, Charging, Discharging, Not charging
stat=$(cat /sys/class/power_supply/BAT0/status)


stat_symbol=""

bat_stat_symbol () {
	# charge as an integer between 0-10
	charge=$((10 * $charge_now / $charge_full))
	case $charge in 
		0) stat_symbol="" ;;
		1) stat_symbol="" ;;
		2) stat_symbol="" ;;
		3) stat_symbol="" ;;
		4) stat_symbol="" ;;
		5) stat_symbol="" ;;
		6) stat_symbol="" ;;
		7) stat_symbol="" ;;
		8) stat_symbol="" ;;
		9) stat_symbol="" ;;
		10) stat_symbol="" ;;
	esac
}

case $stat in
	'Full') stat_symbol="" ;;
	'Charging') stat_symbol="" ;;
	'Discharging') bat_stat_symbol ;;
	'Not charging') bat_stat_symbol ;;
	'Unknown') stat_symbol="" ;;
	*) stat_symbol="" ;;
esac

charge_pct=$((100 * $charge_now / $charge_full))
if [[ $charge_pct == 100 ]]; then
	charge_txt='100'
else
	charge_txt=$(printf "%d%%" $charge_pct)
fi

printf "%s %s\n" $stat_symbol $charge_txt