inhibit-screensaver

#!/bin/bash
if [[ -z "$1" ]] ; then
  printf 'Usage: %s [PID|command]\n' "$0"
  printf '\nInhibits the screensaver until PID stops running or the command finishes\n'
  exit 1
fi

inhibit_until_killed() {
    while sleep 30 ; do
        xscreensaver-command -deactivate 2>&1 | grep -v -e '^xscreensaver-command: not active: idle timer reset.$' -e '^$'
        printf '.'
    done
}

if [[ "$1" =~ ^[0-9]+$ ]] && [[ "$#" == "1" ]] ; then
    printf 'Inhibiting screensaver while process %s is running\n' "$1"
    while ps $1 >/dev/null ; do
        xscreensaver-command -deactivate 2>&1 | grep -v -e '^xscreensaver-command: not active: idle timer reset.$' -e '^$'
        printf '.'
        sleep 30
    done
    printf '\nProcess %s is no longer running, stopped inhibiting screensaver\n' "$1"
else
    printf 'Inhibiting screensaver until command finishes: '
    printf '%q ' "$@"
    printf '\n'
    coproc inhibit_until_killed

    "$@" ; RETURN_CODE=$?

    kill ${COPROC_PID[0]}

    exit $RETURN_CODE
fi