// A static file server written in Go.

package main

import (
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"
)

type Options struct {
	// The port on which the server should listen.
	Port int

	// The address on which the server should listen.
	Host string
}

func main() {
	var options Options

	flag.IntVar(&options.Port, "port", 3000, "the port on which to listen")
	flag.StringVar(&options.Host, "host", "localhost", "the host on which to listen")
	flag.Parse()

	var dir string
	var err error
	if len(flag.Args()) > 0 {
		dir = flag.Arg(0)
	} else {
		dir, err = os.Getwd()
		if err != nil {
			log.Fatal("cannot determine current working directory")
		}
	}

	fs := http.FileServer(http.Dir(dir))
	http.Handle("/", fs)
	log.Printf("Listening on %s:%d...\n", options.Host, options.Port)
	http.ListenAndServe(fmt.Sprintf(":%d", options.Port), nil)
}