feat: show version when meeting -v/--version args

main.go

@@ -3,13 +3,20 @@ package main
 import (
 	"flag"
 	"fmt"
+	"os"
 )
 
 var quit = make(chan struct{})
 var servAddr = flag.String("a", "127.0.0.1:8080", "listening address in \"<ip>:<port>\" format")
 var filePath = flag.String("f", UserHomeDir(), "handling local file path in \"/.../<path>\" format")
 
 func main() {
+	for _, arg := range os.Args[1:] {
+		if arg == "-v" || arg == "-version" {
+			fmt.Println("2021.11.16.0")
+			return
+		}
+	}
 	flag.Parse()
 	fmt.Printf("GoFS is listening on %s and handling %s ...\n", *servAddr, *filePath)
 	go GoRunWebApp(*servAddr, *filePath)