idlex

#!/bin/bash

die() {
    echo "$@"
    exit 1
}

print_help() {
  cat <<EOL
Usage: $0 [-h] [-t <time-in-ms>] [-e <command>|-x <command>]...

Runs as a simple daemon and executes commands when user is idle
or respectively when he stops being idle.

Multiple entry and exit commands should work.

Options:
    -e "<command>" specify an idle state entry command
    -x "<command>" specify an idle state exit command
    -i <sleep time> specify how often to check for idle (default:10s)
    -t <time in ms> specify how long the user has to be idle (default:5s)
    -h print help"
EOL
  exit 0
}

enter_commands=("echo entering idle")
exit_commands=("echo exiting idle")
idletime=$((5*60*1000))
interval=10s

while getopts "i:e:x:t:h?" opt; do
  case $opt in
    e) enter_commands+=("$OPTARG") ;;
    x) exit_commads+=("$OPTARG") ;;
    t) idletime="$OPTARG" ;;
    i) interval="$OPTARG" ;;
    h) print_help ;;
    ?) break ;;
  esac
done

which xprintidle &>/dev/null || die "Failed to find xprintidle utility, cannot proceed."

idle=false

while sleep "$interval"; do
  if [ "$(xprintidle)" -ge "$idletime" ]; then
    if [ "$idle" = false ]; then
      idle=true
      for command in "${enter_commands[@]}"; do
        eval "$command"
      done
    fi
  elif [ "$idle" = true ]; then
    idle=false
    for command in "${exit_commands[@]}"; do
      eval "$command"
    done
  fi
done