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)                
        }
}