Sleeper: a tool to suspend your PC under lightweight window managers

sleeper-0.2

#!/bin/bash

# Sleeper: a tool to suspend your PC under lightweight window managers
# By Andy O'Neill <andy@potatoriot.com> 2012
# Released to the public domain

# Depends on xprintidle & console-kit (apt-get install xprintidle console-kit)

# Usage: just launch it from your .xinitrc or whatever you use to launch your WM
#   e.g. sleeper &
# Configuration:
# Set IDLE_SUSPEND_TIME in ms
#    e.g. IDLE_SUSPEND_TIME=1800000 sleeper &


# Time in between idle checks in seconds
IDLE_CHECK_INTERVAL=60
DONT_SUSPEND_FILE=/tmp/DONT_SUSPEND_$DISPLAY
LABEL="Sleeper on $DISPLAY -"

if [ -z $IDLE_SUSPEND_TIME ]; then
	echo "Choosing default idle suspend time: 1 hour"
	IDLE_SUSPEND_TIME=3600000
fi

while true; do
	# Get the active sessions
	active_x_display=$(ck-list-sessions | grep -A 1 "active = TRUE" | tail -1 \
			| awk -F "'" '{print $2}')
	idle=$(xprintidle)
	echo "$LABEL Active X display: $active_x_display Idle time: $idle ms"
	if [ "$active_x_display" != "$DISPLAY" ]; then
		echo "$LABEL Current display is not active, would not suspend"
	elif [ -f $DONT_SUSPEND_FILE ]; then
		echo "Sleeper $DISPLAY - idle time is $idle ms but \
				$DONT_SUSPEND_FILE exists"
	elif [ $idle -gt $IDLE_SUSPEND_TIME ];then
		echo "$LABEL idle time is $idle ms, trying to suspend now"
		sudo pm-suspend
	fi
	sleep $IDLE_CHECK_INTERVAL
done