xmonad/battery-monitor.sh

#!/bin/bash
set -e
trap 'xmessage -nearmouse "WARNING: battery monitor died!"' EXIT
was_notified=0
while true; do
    acpi_data=$(acpi -b | grep -v 'rate information unavailable' | head -n1)
    status=$(echo -n "$acpi_data" | awk -F'[,:%]' '{print $2}')
    capacity=$(echo -n "$acpi_data" | awk -F'[,:%]' '{print $3}')
    echo "Status: $status; Capacity: $capacity; was_notified: $was_notified"
    if [[ "$status" =~ "Charging" ]]; then
        was_notified=0
    fi
    if [[ "$status" =~ "Discharging" && "$capacity" -lt 15 && "$was_notified" = 0 ]]; then
        xmessage -nearmouse "$acpi_data"&
        was_notified=1
    fi
    if [[ "$status" =~ "Discharging" && "$capacity" -lt 10 ]]; then
        echo -e "Battery critical, suspending\n$acpi_data" | xmessage -nearmouse -file -&
        sleep 5
        systemctl suspend
        sleep 600 # Wait 10 minutes, so we only hibernate once
    fi
    sleep 10
done