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#!/bin/bash
# rand
# ====
# Usage: rand START END [OPTIONS]
#
# Returns a random number within a range (inclusive)
help_msg() {
cat <<-EOF
Returns a random number within a range (inclusive)
Usage: rand START END [OPTIONS]
Options:
-w, --width N zero-pad number to be N wide
-h, --help print this message
EOF
exit 1
}
err_msg() {
(>&2 echo "$1")
exit 1
}
START=
END=
WIDTH=1
POSITIONAL=()
while [[ $# -gt 0 ]]; do
case $1 in
-h|--help) help_msg;;
-w|--width) WIDTH="$2"; shift; shift;;
*) POSITIONAL+=("$1"); shift;;
esac
done
if [[ ${#POSITIONAL[@]} -lt 2 ]]; then
err_msg "Usage: rand START END"
exit 1
else
START="${POSITIONAL[0]}"
END="${POSITIONAL[1]}"
if ! is-int.sh "$START"; then
err_msg "Expected numeric argument (given '${START}')"
elif ! is-int.sh "$END"; then
err_msg "Expected numeric argument (given '${END}')"
elif [[ $START -ge $END ]]; then
err_msg "Expected ascending range ('${END}' not greater than '${START}')"
fi
fi
seq -f "%0${WIDTH}g" "$START" "$END" | shuf -n 1