refactor command table

redis/reply/errors.go

@@ -28,10 +28,23 @@ func (r *ArgNumErrReply) Error() string {
 	return "ERR wrong number of arguments for '" + r.Cmd + "' command"
 }
 
+// MakeArgNumErrReply represents wrong number of arguments for command
+func MakeArgNumErrReply(cmd string) *ArgNumErrReply {
+	return &ArgNumErrReply{
+		Cmd: cmd,
+	}
+}
+
 // SyntaxErrReply represents meeting unexpected arguments
 type SyntaxErrReply struct{}
 
 var syntaxErrBytes = []byte("-Err syntax error\r\n")
+var theSyntaxErrReply = &SyntaxErrReply{}
+
+// MakeSyntaxErrReply creates syntax error
+func MakeSyntaxErrReply() *SyntaxErrReply {
+	return theSyntaxErrReply
+}
 
 // ToBytes marshals redis.Reply
 func (r *SyntaxErrReply) ToBytes() []byte {