use an array for verbs

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)

verbs.go

@@ -22,66 +22,20 @@ const (
 	Watch
 )
 
+var verbs = []string{"Ack", "Attach", "Connect", "Error", "File", "Get", "Log", "Ls", "Set", "Spawn", "Start", "Stop", "Watch"}
+
 func VerbFromString(s string) (Verb, error) {
-	switch s {
-	case "Ack":
-		return Ack, nil
-	case "Attach":
-		return Attach, nil
-	case "Connect":
-		return Connect, nil
-	case "Error":
-		return Error, nil
-	case "File":
-		return File, nil
-	case "Get":
-		return Get, nil
-	case "Log":
-		return Log, nil
-	case "Ls":
-		return Ls, nil
-	case "Set":
-		return Set, nil
-	case "Spawn":
-		return Spawn, nil
-	case "Start":
-		return Start, nil
-	case "Stop":
-		return Stop, nil
-	case "Watch":
-		return Watch, nil
+	for i, verb := range verbs {
+		if verb == s {
+			return Verb(i), nil
+		}
 	}
 	return 0, fmt.Errorf("Unrecognised verb: %s", s)
 }
 
 func (v Verb) String() string {
-	switch v {
-	case Ack:
-		return "Ack"
-	case Attach:
-		return "Attach"
-	case Connect:
-		return "Connect"
-	case Error:
-		return "Error"
-	case File:
-		return "File"
-	case Get:
-		return "Get"
-	case Log:
-		return "Log"
-	case Ls:
-		return "Ls"
-	case Set:
-		return "Set"
-	case Spawn:
-		return "Spawn"
-	case Start:
-		return "Start"
-	case Stop:
-		return "Stop"
-	case Watch:
-		return "Watch"
+	if int(v) < len(verbs)-1 {
+		return verbs[v]
 	}
 	return ""
 }