#!/bin/sh

TITLE=
LABEL=
DEFAULT=
REQUIRED=0
ERROR=0
HEIGHT=8
WIDTH=50

while getopts "t:l:d:h:w:r" option; do
	case "$option" in
		t) TITLE="$OPTARG";;
		l) LABEL="$OPTARG";;
		d) DEFAULT="$OPTARG";;
		h) HEIGHT="$OPTARG";;
		w) WIDTH="$OPTARG";;
		r) REQUIRED=1;;
		:) ERROR=1;;
		?) ERROR=1;;
	esac
done

if [ $ERROR -eq 1 ]; then
	exit 1
fi

VALUE=
DO_ASK=1

while [ $DO_ASK -eq 1 ]; do
	VALUE="$(whiptail --title "$TITLE" --inputbox "$LABEL" $HEIGHT $WIDTH "$DEFAULT" 3>&1 1>&2 2>&3)"
	STATUS=$?

	if [ $STATUS -eq 0 ]; then
		if [ $REQUIRED -eq 1 -a -z "$VALUE" ]; then
			DO_ASK=1
		else
			DO_ASK=0
		fi
	else
		exit $STATUS
	fi
done

echo "$VALUE"