#!/bin/bash

icon=""
battery="$(upower -d | awk '/on-battery/ {print $2}')"
percent="$(upower -d | awk '/percentage/ {print $2}' | head -n 1)"
remaining="$(upower -d | awk -F: '/time to empty/ {print $2}' | awk '{print $1,$2}' | head -n 1)"

if [ "$battery" = 'yes' ]; then
    if [ -n "$remaining" ] && [ "$(echo "$percent" | awk -F% '{print $1}')" -lt "$THRESHOLD" ]; then
        notify-send "CHARGE BATTERY"
        for file in /dev/pts/*; do
            if [ "$(ls -l "$file" | awk '{print $5}')" = '136,' ]; then
                echo "CHARGE BATTERY" >> "$file"
            fi
        done
    fi
    echo "${icon} ${percent} (${remaining})"
else
    echo ""
fi