#!/bin/bash
#
# scrollbar - display scrolling text
#
# usage: scrollbar args
#
# A cute hack originally from Heiner Steven <hs@bintec.de>
#
# converted from ksh syntax to bash v2 syntax by Chet Ramey

WIDTH=${COLUMNS:-80}

[ $# -lt 1 ] && set -- TESTING

# Posix.2 compatible printf command or bash loadable builtin
# in examples/loadables/printf
Text=$(printf "%-${WIDTH}s" "$*")
Text=$(echo "$Text" | tr ' ' '_')

while :
do
	printf "%-.${WIDTH}s\r" "$Text"
	LastC=$(expr "$Text" : '.*\(.\)$')
	Text=$(printf "%-.${WIDTH}s" "$LastC$Text")
done