#!/bin/bash
# Arch R - Current brightness level for ES info bar
# Returns brightness percentage

curbright=$(cat /sys/class/backlight/backlight/brightness 2>/dev/null)
maxbright=$(cat /sys/class/backlight/backlight/max_brightness 2>/dev/null)

if [ -z "$curbright" ] || [ -z "$maxbright" ] || [ "$maxbright" -eq 0 ]; then
    echo "N/A"
    exit 0
fi

echo $((200 * curbright / maxbright - 100 * curbright / maxbright))