Allow interactive options that echo to the console

[portus84]

Hi, now interactive mode hide text digitized by user. There is a mode to use interactive mode which show text that user insert during write on console?

[remkop]

Currently the picocli library does not provide this functionality, but I think it would be a good feature to have.

Perhaps we should add an echo attribute, that allows applications to control whether the user input is echo-ed to the console or not. I'm also thinking to add a prompt attribute so that applications can customize the text displayed to the end user for an interactive option. For example:

@Option(names = "-x", interactive = true, echo = true, prompt = "Enter your PIN: ")
String pin;

[remkop]

Note that you can work around this in the application, by calling Console.readLine:

public class Interactive implements Runnable {
    @Option(names = {"-u", "--user"}, interactive = true,
            description = "user id")
    private String user;

    public void run() {
        if (user == null) {
            user = new String(System.console().readLine("We really need a user id: "));
        }
        System.out.printf("Ok, we got: %s%n", user);
        // do stuff...
    }

    public static void main(String[] args) {
        int exitCode = new CommandLine(new Interactive()).execute(args);
    }
}