sleep_if_inactive_on_battery.sh

sleep_if_inactive_on_battery.sh

#!/usr/bin/env bash

function notify-send() {
    # Detect the name of the display in use
    local display=":$(ls /tmp/.X11-unix/* | sed 's#/tmp/.X11-unix/X##' | head -n 1)"

    # Detect the user using such display
    local user=$(who | grep '('$display')' | awk '{print $1}' | head -n 1)

    # Detect the id of the user
    local uid=$(id -u $user)

    sudo -u $user DISPLAY=$display DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/$uid/bus notify-send "$@"
}

status=$(cat /sys/class/power_supply/BAT0/status)

# Exit if not discharging
if [ "${status}" != "Discharging" ]; then
  exit 0
fi

monitor_status=$(xset q | grep "Monitor is")

# Exit if monitor is on
if [[ "${monitor_status}" == *"On"* ]]; then
  exit 0
fi

current_x_inactivity_ms=$(xprintidle)

# X inactivity time (msecs)
x_inactivity_action_ms=300000 # 10 minutes

if [ "${current_x_inactivity_ms}" -ge ${x_inactivity_action_ms} ]; then
  notify-send "Suspend due to inactivity"
  sleep 30
  systemctl suspend
  exit 0
fi