#!/usr/bin/env bash
set -eo pipefail

if [[ "$1" == "-h" || "$1" == "--help" ]]; then
    cat <<EOF
Usage: $(basename "$0") [-h] [port]

Start a simple HTTP server in current directory.

Options:
    -h, --help    Show this help message

Arguments:
    port          Port number (default: 8888)

EOF
    exit 0
fi

port="${1:-8888}"

if hash php 2>/dev/null; then
    exec php -S "localhost:$port"
elif hash python3 2>/dev/null; then
    exec python3 -m http.server "$port"
elif hash python 2>/dev/null; then
    major_version="$(python -c 'import platform as p;print(p.python_version_tuple()[0])')"
    if [[ "$major_version" == '3' ]]; then
        exec python -m http.server "$port"
    else
        exec python -m SimpleHTTPServer "$port"
    fi
else
    echo 'unable to start HTTP server' 1>&2
    exit 1
fi