nixcfg/homeManagerModules/services/waybar/scripts/check-battery.sh

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#!/usr/bin/env bash
if [ -d /sys/class/power_supply/BAT0 ]; then
BAT=/sys/class/power_supply/BAT0
elif [ -d /sys/class/power_supply/BAT1 ]; then
BAT=/sys/class/power_supply/BAT1
else
echo "No battery found."
exit 1
fi
CRIT=''${1:-10}
STAT=$(cat $BAT/status)
PERC=$(cat $BAT/capacity)
if [[ $PERC -le $CRIT ]] && [[ $STAT == "Discharging" ]]; then
notify-send --urgency=critical --icon=dialog-error "Battery Critical" "Current charge: $PERC%".
fi