Pregunta NPM | npm.io

pregunta

Hassle free CLI input.

Slim chainable library, when you need something like npm init, to interactively gather input.

installation

npm i pregunta --save

usage

Example: npm init

var pregunta = require('pregunta')

pregunta
.say('This utility will walk you through creating a package.json file.')
.say('It only covers the most common items, and tries to guess sane defaults.')
.say('')
.say('See `npm help json` for definitive documentation on these fields')
.say('and exactly what they do.')
.say('')
.say('Use `npm install <pkg> --save` afterwards to install a package and')
.say('save it as a dependency in the package.json file.')
.say()
.say('Press ^C at any time to quit.')
.ask('name').validate(function(answer){
    return ['.', '_'].indexOf(answer.trim()[0]) === -1
})
.ask('version').default('1.0.0')
.ask('description')
.ask('entry point').default('index.js')
.ask('test command')
.ask('git repository')
.ask('keywords')
.ask('license').default('ISC')
.done(function (questionnaire) {
    console.log(questionnaire)
})

Note: Use .var('variableName') to specify the name of the variable to hold the answer, otherwise the question itself will be the name of the variable.

Yes or No questions

You can use the yn method to ask yes/no questions. The second argument if set becomes the default value

var pregunta = require('pregunta')
pregunta
    .yn('would you like to continue?', true)
    .done(function(err, questionnaire){
        console.log(
            'answer was: %s',
            questionnaire['would you like to continue?']
        )
    })

Choices

You can use the choose to ask for a choice. The third argument is the default, it can be either a string or an index.

var pregunta = require('pregunta')
pregunta
    .choose('choose a color:', ['red', 'green', 'blue'], 'green')
    .done(function(err, questionnaire){
        console.log(
            'your choice was: %s',
            questionnaire['choose a color:']
        )
    })

Validation

The validate method can be use to set validation for input. The value can be either a RegExp to test the answer or a Function that receives the answer as the first argument and must return either true or false. Note that the ask method can accept validation as the third argument or you can simply append a validate method to set the validation.

The invalid method sets a message to print out when the validation fails. It can be a String, where if it contains a %s character, it will be replaced with the erroneous answer given. Its value can also be a Function whose first argument will be the erroneous answer and must return a string to print out or a falsy value to not print out a message.

var pregunta = require('pregunta')
var REG_EMAIL = /^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$/i
pregunta
    .ask('email', 'example@gmail.com', REG_EMAIL)
    .validate(REG_EMAIL)
    .invalid('\n [!] `%s` is not a valid email!\n')
    .done(function(err, questionnaire){
        console.log(
            'your email was: %s',
            questionnaire['email']
        )
    })

Prompt

The say method is used to print out messages. The message piggybacks the last question asked and appears beforehand, i.e before the prompt is shown for that question

var pregunta = require('./index')
var pokemon = ['pikachu', 'bulbasaur', 'charmander']
var statement = 'choose a pokemon:\n\n\t' + pokemon.join('\n\t') + '\n\n'
  pregunta
      .say('Your life depends on this')
      .say(statement)
      .choose('pokemon', pokemon, 'charmander')
      .invalid('\nnoo! your answer `%s` is invalid!\n')
      .done(function(err, questionnaire){
          console.log(
              'your pokemon is: %s',
              questionnaire['pokemon']
          )
      })