sandman.sh

#!/usr/bin/zsh
#xdotool getactivewindow getwindowpid
getwindowpid () {
  if wmpid=$(xprop |grep ^_NET_WM_PID); then
    pid=${wmpid##* = }
    if [[ $pid = 1 ]]; then
      pgrep -o iceweasel # HACK - I run iceweasel in a sandbox with its own pid namespace
    else
      echo $pid
    fi
  else
    exit 1
  fi
}

awake () {
  case $(ps ho state $1) in
    T)
      return 1
      ;;
    S)
      return 0
      ;;
  esac
}

wake () {
  if [[ -n $1 ]]; then
    if [[ $1 = <-> ]]; then
      kill -s CONT $1
    else
      killall -SIGCONT $1
    fi
  else
    if pid=$(getwindowpid); then
      kill -s CONT $(getwindowpid)
    fi
  fi
}

sleep () {
  timeout 1s xclip -o | xclip # a stopped firefox will not respond to paste requests
  if [[ -n $1 ]]; then
    if [[ $1 = <-> ]]; then
      kill -s STOP $1
    else
      killall -SIGSTOP $1
    fi
  else
    if pid=$(getwindowpid); then
      kill -s STOP $pid
    fi
  fi
}

toggle () {
  if ! pid=$(getwindowpid); then
    exit 2
  fi
  if awake $pid; then
    sleep $pid
  else
    wake $pid
  fi
}
usage () {
  cat <<USAGE
sandman wake|sleep|toggle [procname]
  by default, sandman will send SIGSTOP|SIGCONT to the specified process.
  if no procname is given, it'll ask xprop to get a pid.
  toggle takes no arguments.
USAGE
}

case $1 in
  wake)
    wake $2
    ;;
  sleep)
    sleep $2
    ;;
  toggle)
    toggle
    ;;
  *)
    usage
    ;;
esac