#!/usr/bin/env sh
perror() {
  >&2 printf '\033[1;31mERROR:\033[0m \033[1m%s\033[0m\n' "$*"
}

usage() {
  name=$(basename "$0")

  cat << EOF
${name}: usage
  ${name} [status] - show if the server is running
  ${name} start|stop|restart - control the server
  ${name} help|usage - show help
EOF
}

error_usage() {
  perror "invalid usage"
  >&2 usage

  exit 1
}

is_running() {
  vncserver -list | grep -q '^:1'
}

start() {
  if ! is_running; then
    set -- vncserver \
      -localhost -alwaysshared \
      -securitytypes none
    [ -x ~/.vnc/xstartup ] && set -- "$@" -xstartup ~/.vnc/xstartup

    "$@"
  else
    perror "server already started"
    return 2
  fi
}

stop() {
  if is_running; then
    vncserver -kill :1
  else
    perror "server is not running"
    return 2
  fi
}

status() {
  if is_running; then
    printf '\033[1;32m*\033[0m \033[1m%s\n' "the server is running"
  else
    printf '\033[1;31m*\033[0m \033[1m%s\n' "the server is not running"
  fi
}

case "$1" in
  ""|status) status ;;
  start) start ;;
  stop)  stop  ;;
  restart)
    stop
    start
    ;;
  *)
    error_usage
    ;;
esac