More unified argument to the tool processing function.

src/cmd/test/main.go

@@ -9,18 +9,22 @@ import(
 var(
 	tools = mtool.Tools{
 		"echo" : mtool.Tool{
-			func(args []string, flags *mtool.Flags) {
+			func(flags *mtool.Flags) {
 				var b bool
 				flags.BoolVar(&b, "b", false, "the check flag")
-				flags.Parse(args)
-				fmt.Println(flags.Args())
+				flags.Parse()
+				
+				args := flags.Args()
+				
+				fmt.Println(args)
 			},
 			"print string to standard output string",
 			"[str1 str2 ... strN]",
 		},
 		"sum" : mtool.Tool{
-			func(args []string, flags *mtool.Flags) {
-				flags.Parse(args)
+			func(flags *mtool.Flags) {
+				flags.Parse()
+				args := flags.Args()
 				one, _ := strconv.Atoi(args[1])
 				two, _ := strconv.Atoi(args[2])
 				fmt.Println(one + two)

src/mtool/main.go

@@ -10,9 +10,11 @@ import(
 
 type Flags struct {
 	*flag.FlagSet
+	args []string
+	parsedArgs []string
 }
 
-type Handler func(args []string, flags *Flags)
+type Handler func(*Flags)
 
 type Tool struct {
 	Handler Handler
@@ -21,6 +23,15 @@ type Tool struct {
 
 type Tools map[string] Tool
 
+func (flags *Flags) Parse() {
+	flags.FlagSet.Parse(flags.args)
+	flags.parsedArgs = flags.FlagSet.Args()
+}
+
+func (flags *Flags) Args() []string {
+	return flags.parsedArgs
+}
+
 func Main(name string, m Tools) {
 	var(
 		utilName string
@@ -65,6 +76,8 @@ func Main(name string, m Tools) {
 	flagSet := flag.NewFlagSet(arg1, flag.ExitOnError)
 	flags := &Flags{
 		flagSet,
+		[]string{},
+		[]string{},
 	}
 	flags.Usage = func() {
 		out := flags.Output()
@@ -102,8 +115,8 @@ func Main(name string, m Tools) {
 		os.Exit(1)
 	}
 	
-	args = args[1:]
+	flags.args = args[1:]
 	
-	util.Handler(args, flags)
+	util.Handler(flags)
 }