form

type Filler interface {
	Fill(f Form) (map[string]interface{}, error)
}

type Form struct {
	// Title holds the title of the form, giving contextual
	// information for the fields.
	Title string

	// Fields holds the fields that make up the body of the form.
	Fields environschema.Fields
}

type IOFiller struct {
	// In is used to read responses from the user. If this is nil,
	// then os.Stdin will be used.
	In io.Reader

	// Out is used to write prompts and information to the user. If
	// this is nil, then os.Stdout will be used.
	Out io.Writer

	// MaxTries is the number of times to attempt to get a valid
	// response when prompting. If this is 0 then the default of 3
	// attempts will be used.
	MaxTries int

	// ShowDescriptions holds whether attribute descriptions
	// should be printed as well as the attribute names.
	ShowDescriptions bool

	// GetDefault returns the default value for the given attribute,
	// which must have been coerced using the given checker.
	// If there is no default, it should return (nil, "", nil).
	//
	// The display return value holds the string to use
	// to describe the value of the default. If it's empty,
	// fmt.Sprint(val) will be used.
	//
	// If GetDefault returns an error, it will be printed as a warning.
	//
	// If GetDefault is nil, DefaultFromEnv will be used.
	GetDefault func(attr NamedAttr, checker schema.Checker) (val interface{}, display string, err error)
}

type NamedAttr struct {
	Name string
	environschema.Attr
}