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|
#!/bin/sh
set -eu
usage() {
cat <<-'EOF'
Usage:
clamp NUMBER MIN MAX
clamp -h
EOF
}
help() {
cat <<-'EOF'
Options:
-h, --help show this message
NUMBER the number to be clamped
MIN lower bound
MAX upper bound
Clamp the NUMBER between MIN and MAX.
Examples:
Assert the number is within the interval:
$ clamp 5 3 9
5
When a number is below MIN it gets clamped:
$ clamp 1 3 9
3
When a number is above MAX it gets clamped:
$ clamp 15 3 9
9
EOF
}
for flag in "$@"; do
case "$flag" in
(--)
break
;;
(--help)
usage
help
exit
;;
(*)
;;
esac
done
while getopts 'h' flag; do
case "$flag" in
(h)
usage
help
exit
;;
(*)
usage >&2
exit 2
;;
esac
done
shift $((OPTIND - 1))
NUMBER="${1:-}"
MIN="${2:-}"
MAX="${3:-}"
eval "$(assert-arg -- "$NUMBER" 'NUMBER')"
eval "$(assert-arg -- "$MIN" 'MIN')"
eval "$(assert-arg -- "$MAX" 'MAX')"
if [ "$MIN" -gt "$MAX" ]; then
printf 'MIN (%s) is greater then MAX (%s).\n' "$MIN" "$MAX" >&2
exit 2
fi
min -- "$(max -- "$NUMBER" "$MIN")" "$MAX"
|
