#!/bin/sh
set -eu

usage() {
	cat <<-'EOF'
		Usage:
		  qr [-s PIXEL_SIZE]
		  qr -h
	EOF
}

help() {
	cat <<-'EOF'

		Options:
		  -s PIXEL_SIZE    size of the pixel (default 10)
		  -h, --help       show this help message

		Read data from STDIN and present a QR image with said data.
	EOF
}

for flag in "$@"; do
	case "$flag" in
		--)
			break
			;;
		--help)
			usage
			help
			exit
			;;
		*)
			;;
	esac
done

PIXEL_SIZE=10
while getopts 's:h' flag; do
	case "$flag" in
		s)
			PIXEL_SIZE="$OPTARG"
			;;
		h)
			usage
			help
			exit
			;;
		*)
			usage >&2
			exit 2
			;;
	esac
done
shift $((OPTIND - 1))


cat | qrencode -s "$PIXEL_SIZE" -o- | feh -