Send pushover notification when Mac battery gets low

battery-pushover.sh

#!/bin/bash
# Usage ./battery-pushover.sh <percent threshold>

batterypct() {
    pct=`ioreg -n AppleSmartBattery | grep -i capacity | tr '\n' ' | ' | awk '{printf("%d", $10/$5 *100 )}'`
    echo $pct
}

send() {
    curl -s \
        -F "token=<use your own>" \
        -F "user=<use your own>" \
        -F "title=Battery low" \
        -F "message=Battery below $1%" \
        https://api.pushover.net/1/messages.json > /dev/null
}

if [[ ! -e ~/".bat-lock" ]]; then
    threshold=$1
    pct=$(batterypct)
    if [[ "$pct" -le "$threshold" ]]; then
        send "$threshold"
        touch ~/.bat-lock

        while : ; do
            sleep 60 # 1 min
            pct=$(batterypct)
            if [[ "$pct" -gt "$threshold" ]]; then
                rm ~/.bat-lock
                break
            fi
        done
    fi
else
    echo "~/.bat-lock exists."
fi

exit 0