go http file server

http.go

package main

import (
	"flag"
	"fmt"
	"net/http"
	"os"
	"path"
	"strconv"
)

var (
	port = flag.Int("p", 6060, "http server port")
	root = flag.String("d", "./", "root document dir")
)

func main() {
	flag.Parse()
	pwd, err := os.Getwd()
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	var (
		doc string
	)
	if path.IsAbs(*root) {
		doc = *root
	} else {
		doc = path.Join(pwd, *root)
	}
	if _, err := os.Stat(doc); err == nil {
		fmt.Println("Server listening on port " + strconv.Itoa(*port))
		fmt.Println("Document root " + doc)
		error := http.ListenAndServe(":"+strconv.Itoa(*port), http.FileServer(http.Dir(doc)))
		if error != nil {
			fmt.Println("Error listening:", error.Error())
			os.Exit(1)
		}

	} else {
		fmt.Println(doc + " not exists")
	}

}