command-asker

Easy way to interact with the user through the command line.

Installation

$ npm install command-asker

How to use

var CommandAsker = require('command-asker');

// Init object and configure questions 
var a = new CommandAsker([
    { key: 'firstname', ask: 'what is your firstname ? ' },
    { key: 'lastname',  ask: 'what is your lastname ? ', required: true },
    { key: 'age',  ask: 'how old are you ? ', validators: [isAdult] }
]);

// Launch the prompt command
a.ask(function(response) {
    console.log('My name is ' + response.firstname + ' ' + response.lastname + ' (' + response.age + ')');
    
    // Close the prompt command
    a.close();
});

// Validator
var isAdult = function(value) {
    if (value < 18) {
        return when.reject({
            'name'      : 'not_adult',
            'message'   : 'you must be over 18 years'
        });
    }
    return when.resolve();  
};

$ node ./your-file.js
what is your firstname ? chuck
what is your lastname ? norris
how old are you ? 22
My name is chuck norris (22)

Validator

The validator is optional, but, you can pass one or more validators. A promise must be return from validator, in the case of an error, the format should be the following:

{
    name      : 'not_adult',
    message   : 'you must be over 18 years'
}

example of validator

var isAdult = function(value) {
    if (value < 18) {
        return when.reject({
            'name'      : 'not_adult',
            'message'   : 'you must be over 18 years'
        });
    }
    return when.resolve();  
};

Required

You can set a question as required, you have to specify the property "required" with true. if the user specified an empty value, he will get an error.

var a = new CommandAsker([
    // ...
    { key: 'lastname',  ask: 'what is your lastname ? ', optional: true }
    // ...
]);

Retrieve data

A callback are called when the questions are launched.

The parameter is populated with the data entered by the user and they are retrievable by properties specified in configuration.

a.ask(function(response) {
    console.log('My name is ' + response.firstname + ' ' + response.lastname + ' (' + response.age + ')');
});

License

MIT.