a wrapper for xscreensaver-command to behave like gnome-screensaver-command

xscreensaver-command wrapper

#!/bin/bash
# screen-saver wrapper to fix/modify xflock4 behavior
# It also logs when it's activated.

#logfile="$HOME/.screensaver.log"
logfile="$HOME/usr/var/log/screensaver.log"

control_command () {
    #gnome-screensaver-command "$@"
    /usr/bin/xscreensaver-command "$@"
}

start_screensaver_if_not () {
    if ! pgrep '^xscreensaver$' > /dev/null 2>&1
    then
        echo "Starting xscreensaver"
        ( xscreensaver -no-splash 0<&- &>/dev/null & )
    fi
}

dtparse () {
    python -c 'import sys; import dateutil.parser as p; h=sys.stdin.readline(); dt=p.parse(h); print dt'
}


######################################################
datestring=$(date '+%Y%m%d-%H:%M:%S')
LOG () {
    if [ -w $logfile ]; then
        echo "$datestring xscreensaver $*" >> $logfile
    fi
}

log_nonblank_since () {
    out=$(control_command -time)
    case "$out" in
        *"non-blanked since"*)
            echo "$(echo "$out" | sed -e 's/^.*since \(.*\) (.*$/\1/g' | dtparse | sed -e 's/-//g' -e 's/ /-/') non-blank since." >> $logfile
            ;;
        *)
            : ignore ;;
    esac
}

start_screensaver_if_not

arg="$1"
shift

case "$arg" in
   -prefs) $pref_command -prefs;;
   -cycle|-next|-prev|-exit) : ignore ;;
   -log)
       log_nonblank_since;;
   -lock)
       log_nonblank_since
       #control_command "-activate"
       control_command "-lock"
       LOG "locked"
       ;; # lwsmd issue.
   -activate|-deactivate)
       control_command $arg
       LOG "${arg#-}"
       ;;
   -demo|-time|-prefs) control_command $arg "$@";;
   *)  echo "$0: Unrecognized command: $arg" >&2
   ;;
  esac