read filename from arg instead of directly loading data

main.go

@@ -71,28 +71,28 @@ func getMode() string {
   return mode
 }
 
-func checkArg() []byte {
-  var data []byte
+func readFn() string {
+  var filename string
   arg := os.Args[1:]
   if len(arg) != 1 {
     fmt.Println("hns only takes file name as arg")
     os.Exit(1)
   }
-  filename := arg[0]
-  if _, err := os.Stat(filename); err == nil {
-    data = file2data(filename)
+  fn := arg[0]
+  if _, err := os.Stat(fn); err == nil {
+    filename = fn
   } else {
     fmt.Println("No such file")
     os.Exit(1)
   }
-  return data
+  return filename
 }
 
 func main() {
-  data := checkArg()
+  fn := readFn()
+  fmt.Println(fn)
   mode := getMode()
   fmt.Println(mode)
-  fmt.Println(len(data))
   /*
   var passwd string = "ThisAnnPassphrase"
   fmt.Println(passwd)