#!/bin/sh
set -eu

PROGRAM="$(basename "${0}")"

has_h=0
for arg in "${@}"; do
    case "${arg}" in
        -h)
            has_h=1
            break
            ;;
        --help)
            has_h=1
            break
            ;;
    esac
done

if [ "${has_h}" -eq 1 ]; then
    TAB=$(printf '\t')
    printf 'Usage: %s\tListen on localhost:8080\nUsage: %s PORT\tListen on localhost:PORT\nUsage: %s HOST PORT\tListen on HOST:PORT\n' "${PROGRAM}" "${PROGRAM}" "${PROGRAM}" | column -t -s "${TAB}"
    exit 0
fi

HOST="localhost"
PORT="8080"

if [ ${#} -gt 1 ]; then
    HOST="${1:-localhost}"
    PORT="${2:-8080}"
else
    HOST="localhost"
    PORT="${1:-8080}"
fi

readonly HOST
readonly PORT


python3 -m http.server -b "${HOST}" "${PORT}"