gistfile1.go

package main

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

func main() {
	dir, err := filepath.Abs(filepath.Dir(os.Args[0]))
	if err != nil {
		log.Fatal(err)
        os.Exit(-1)
	}
	var portn = flag.Int("port", 8080, "The port to run the server on")
    flag.Parse()

	var port = fmt.Sprintf(":%d", *portn)

	fmt.Println("Running server for", dir, "and port", port)
	panic(http.ListenAndServe(port, http.FileServer(http.Dir(dir))))
}