xtoggle.sh

#!/bin/bash
#
# Toggle the state (STOPPED/RUNNING) of a process, clicking to its window.
set -e

debug() { echo "$@" 2>&1; }

die() { local MESSAGE=$1
  debug "Error: $MESSAGE"
  exit 1
}

PID=$(xprop _NET_WM_PID | cut -d' ' -f3)
test "$PID" || die "Could not get PID"
debug "PID: $PID"
STATE=$(cat /proc/$PID/status | grep "^State:" | awk '{print $2}')
test "$STATE" || die "Could not get process state"
debug "State: $STATE"

if test "$STATE" = "T"; then # T = stopped
  sudo kill -SIGCONT $PID 
else
  sudo kill -SIGSTOP $PID
fi