command parser for https://github.com/arschles/go-progprobs/blob/master/aof.md

cmd_parser.go

var (
  ErrInvalidCommand = errors.New("invalid command")
  ErrInvalidNumArgs = errors.New("wrong num args")
  ErrInvalidInt = errors.New("invalid int")
)

const (
  create = "CREATE"
  modify = "MODIFY"
  set = "SET"
  del = "DELETE"
)

func NewCommand(slice []string) (*Command, error) {
  if len(slice) < 2 {
    return nil, ErrInvalidCommand
  }
  cmd := &Command{}
  switch slice[0] {
  case create:
    cmd.Key = slice[1]
    i, err := strconv.Atoi(slice[2])
    if err != nil {
      return nil, ErrInvalidInt
    }
    cmd.Val = i
  }
}