Prompts

[chevcast]

Command author needs a helper for creating prompts. The desired usage would be:

res.prompt('name', function (value) {
    // do work with value
});

The name is important because when prompt is encountered it should examine the provided options to see if a value exists for that name already. If not, then it should prompt for it. This would allow end-users to do either of the following with a hypothetical 'login' command:

login
prompt for username
prompt for password

or

login username
prompt for password

or

login username password

So the logic for the res.prompt() function would be something like this:

if ('promptVar' in options) callback(options[promptVar]);
else setContext(); // Set a context so next provided user input would route back here and invoke the callback.

When a prompt is finished it should restore the previous context (either none or passive).

[chevcast]

Prompts have been implemented.