package main

import (

        "net/http"

        "flag"

        "fmt"

        "log"

)

func main() {

        var dir string

        flag.StringVar(&dir, "d", ".", "web dir")

        var port *int

        port = flag.Int("p", 0, "port: must input")

        var host string

        flag.StringVar(&host,"h","","host")

        flag.Parse()

        if *port<=0 || *port>65535 {

                flag.Usage()

                return

        }

        var addr = fmt.Sprintf("%s:%d", host,*port)

        log.Printf("Listenning http://%s ...", addr)

        http.Handle("/", http.FileServer(http.Dir(dir)))

        err := http.ListenAndServe(addr, nil)

        if err!= nil {

                log.Fatal("ERROR:",err)

        }

}