Golang enum pattern with TextMashalJSON

status.go

package task

import (
	"fmt"
	"strings"
)

// Status ...
type Status int

// Status values
const (
	StatusUnknown Status = iota
	StatusToDo
	StatusInProgress
	StatusInReview
	StatusInTesting
	StatusDone
	StatusDeployed
)

// String ...
func (s Status) String() string {
	return [...]string{"Unknown", "ToDo", "InProgress", "InReview", "InTesting", "Done", "Deployed"}[s]
}

// FromString ...
func (s *Status) FromString(str string) bool {
	ss, ok := map[string]Status{
		"todo":       StatusToDo,
		"inprogress": StatusInProgress,
		"inreview":   StatusInReview,
		"intesting":  StatusInTesting,
		"done":       StatusDone,
		"deployed":   StatusDeployed,
	}[strings.ToLower(str)]

	if ok {
		*s = ss
	}

	return ok
}

// UnmarshalText ...
func (s *Status) UnmarshalText(text []byte) error {
	if s.FromString(string(text)) {
		return nil
	}
	return fmt.Errorf("unknown status: %s", text)
}

// MarshalText ...
func (s Status) MarshalText() ([]byte, error) {
	return []byte(s.String()), nil
}