#!/bin/sh
#
# $Id$

# thank you, https://ubuntuhandbook.org/index.php/2017/04/custom-screen-resolution-ubuntu-desktop/

me=`basename "$0"`
action=$1

Note()
{
  echo $@ 1>&2
}

case "$action" in
add|del)
  shift
  ;;
*)
  Note "Usage: $me [add|del] [arguments to cvt]"
  exit 1
  ;;
esac

AddOrDelMode()
{
  action=$1
  shift

  [ X"$1" = XModeline ] || exit 1
  shift

  mode=$1
  shift

  [ "$action" = add ] && xrandr --newmode $mode "$@"

  rc=2

  for devname in `xrandr | awk '$2 == "connected" {print $1}'`
  do
    if xrandr --"$action"mode "$devname" $mode
    then
      Note $action mode $mode on device $devname succeeded
      rc=0  # one is good enough
    else
      Note $action mode $mode on device $devname failed
    fi
  done

  return $rc
}

mode=`cvt "$@" | grep -v '^#' | sed 's/"//g'`

AddOrDelMode "$action" $mode