driver

type Options struct {
	Writer Writer
	UI     UI
}

type UI interface {
	// ReadLine returns a line of text (a command) read from the user.
	// prompt is printed before reading the command.
	ReadLine(prompt string) (string, error)

	// Print shows a message to the user.
	// It formats the text as fmt.Print would and
	// adds a final \n if not already present.
	// For line-based UI, Print writes to STDERR.
	Print(...any)

	// PrintErr shows a message to the user.
	// It formats the text as fmt.Print would and
	// adds a final \n if not already present.
	// For line-based UI, Print writes to STDERR.
	PrintErr(...any)
}

type Writer interface {
	Open(name string) (io.WriteCloser, error)
}