#!/bin/sh
set -eu

usage() {
	cat <<-'EOF'
		Usage:
		  mkstemp
		  mkstemp -h
	EOF
}

help() {
	cat <<-'EOF'


		Options:
		  -h, --help    show this message


		Create a new temporary file and echo its name back.


		Examples:

		  Capture output into temporary file:

		    $ OUT="$(mkstemp)"; cmd > "$OUT"
	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))


name="$(tmpname)"
touch "$name"
printf '%s\n' "$name"