Now can add descriptions for tools.

src/cmd/test/main.go

@@ -8,13 +8,19 @@ import(
 
 var(
 	tools = multitool.Tools{
-		"echo" : func(args []string) {
-			fmt.Println(args)
+		"echo" : multitool.Tool{
+			func(args []string) {
+				fmt.Println(args)
+			},
+			"print string to standard output string",
 		},
-		"sum" : func(args []string) {
-			one, _ := strconv.Atoi(args[1])
-			two, _ := strconv.Atoi(args[2])
-			fmt.Println(one + two)
+		"sum" : multitool.Tool{
+			func(args []string) {
+				one, _ := strconv.Atoi(args[1])
+				two, _ := strconv.Atoi(args[2])
+				fmt.Println(one + two)
+			},
+			"add one value to another",
 		},
 	}
 )

src/multitool/main.go

@@ -6,8 +6,13 @@ import(
 	"path"
 )
 
+type Tool struct {
+	Handler func(args []string)
+	Desc string
+}
 
-type Tools map[string] func(args []string)
+
+type Tools map[string] Tool
 
 func Main(name string, m Tools) {
 	var(
@@ -20,8 +25,8 @@ func Main(name string, m Tools) {
 		args = os.Args[:]
 	} else {
 		if len(os.Args)<2  {
-			for k, _ := range m {
-				fmt.Printf("%s\n", k)
+			for k, v := range m {
+				fmt.Printf("%s:\t%s\n", k, v.Desc)
 			}
 			os.Exit(0)
 		}
@@ -34,6 +39,6 @@ func Main(name string, m Tools) {
 		os.Exit(1)
 	}
 
-	m[utilName](args)
+	m[utilName].Handler(args)
 }