Function PromptDefault

commands/input/prompt.go:57–90

PromptDefault is a simple text input with a default value.

(prompt, name, preValue string, validators ...PromptValidator)

// PromptDefault is a simple text input with a default value.
func PromptDefault(prompt, name, preValue string, validators ...PromptValidator) (string, error) {
loop:
	for {
		if preValue != "" {
			_, _ = fmt.Fprintf(os.Stderr, "%s [%s]: ", prompt, preValue)
		} else {
			_, _ = fmt.Fprintf(os.Stderr, "%s: ", prompt)
		}

		line, err := bufio.NewReader(os.Stdin).ReadString('\n')
		if err != nil {
			return "", err
		}

		line = strings.TrimSpace(line)

		if preValue != "" && line == "" {
			line = preValue
		}

		for _, validator := range validators {
			complaint, err := validator(name, line)
			if err != nil {
				return "", err
			}
			if complaint != "" {
				_, _ = fmt.Fprintln(os.Stderr, complaint)
				continue loop
			}
		}

		return line, nil
	}
}

// PromptPassword is a specialized text input that doesn't display the characters entered.
func PromptPassword(prompt, name string, validators ...PromptValidator) (string, error) {