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#!/usr/bin/env bash
delay=0.2
fixed=0
l=0 l2=0 w2=0
while getopts 'fw:d:h' o; do
case $o in
d) delay="$OPTARG" ;;
f) fixed=1 ;;
w) w="$((OPTARG))" ;;
h) nr=1 ;&
*)
cat >&2 <<EOF
Usage: $0 [ -h | [ [opts] [text ...] ]
Prints [text ...] as a scrolling marquee
Options:
-f fix width: do not change on SIGWINCH
-w n set width: do not detect (implies -f)
-d n set delay: see documentation on Bash's \`sleep\`
-h see this help
EOF
exit $((1 - nr))
;;
esac
done
shift "$((OPTIND - 1))"
pre="$*"
if ((w == 0)); then
winch_handler() {
w="$(tput cols)"
s="$(printf "%${w}s" "$pre")"
}
winch_handler
((fixed != 1)) && trap "winch_handler" SIGWINCH
else
s="$(printf "%${w}s" "$pre")"
fi
while sleep "$delay"; do
printf '%s\r' "${s:$l:$w}${s:$l2:$w2}"
((l = (l + 1) % ${#s}))
((l2 = (l - ${#s}) > 0 ? (l - ${#s}) : 0))
((w2 = (l + w - ${#s}) > 0 ? (l + w - ${#s}) : 0))
done
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