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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
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))
assert_arg() {
if [ -z "$1" ]; then
printf 'Missing %s\n\n' "$2" >&2
usage >&2
exit 2
fi
}
NUMBER="${1:-}"
MIN="${2:-}"
MAX="${3:-}"
assert_arg "$NUMBER" 'NUMBER'
assert_arg "$MIN" 'MIN'
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"
|
