Universal Pause Button for X11

pause-button

#!/bin/sh
# Universal Pause Button for X11
# by auscompgeek
# licensed under MIT/X11
# requires xdotool

me=pause-button

die() {
	echo "$me: $*" >&2
	exit 1
}

getprocstat() {
	# XXX This probably breaks for process names with spaces.
	set -- $(cat /proc/$1/stat)
	echo $3
}

if [ -z "$DISPLAY" ]; then
	die 'This is not an X11 display!'
fi

window_pid="$(xdotool getactivewindow getwindowpid)"
# because X11 is shit
if [ -z "$window_pid" ]; then
	die 'Could not get active window OR the window does not expose its PID.'
fi

stat="$(getprocstat $window_pid)"
if [ -z "$stat" ]; then
	die 'Process has empty status!?'
fi

sig=STOP
if [ "$stat" = "T" ]; then
	sig=CONT
fi
kill -$sig $window_pid