password.js
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/**
* `password` type prompt
*/
var util = require('util');
var chalk = require('chalk');
var Base = require('./base');
var observe = require('../utils/events');
function mask(input) {
input = String(input);
if (input.length === 0) {
return '';
}
return new Array(input.length + 1).join('*');
}
/**
* Module exports
*/
module.exports = Prompt;
/**
* Constructor
*/
function Prompt() {
return Base.apply(this, arguments);
}
util.inherits(Prompt, Base);
/**
* Start the Inquiry session
* @param {Function} cb Callback when prompt is done
* @return {this}
*/
Prompt.prototype._run = function (cb) {
this.done = cb;
var events = observe(this.rl);
// Once user confirm (enter key)
var submit = events.line.map(this.filterInput.bind(this));
var validation = this.handleSubmitEvents(submit);
validation.success.forEach(this.onEnd.bind(this));
validation.error.forEach(this.onError.bind(this));
events.keypress.takeUntil(validation.success).forEach(this.onKeypress.bind(this));
// Init
this.render();
return this;
};
/**
* Render the prompt to screen
* @return {Prompt} self
*/
Prompt.prototype.render = function (error) {
var message = this.getQuestion();
var bottomContent = '';
if (this.status === 'answered') {
message += chalk.cyan(mask(this.answer));
} else {
message += mask(this.rl.line || '');
}
if (error) {
bottomContent = '\n' + chalk.red('>> ') + error;
}
this.screen.render(message, bottomContent);
};
/**
* When user press `enter` key
*/
Prompt.prototype.filterInput = function (input) {
if (!input) {
return this.opt.default == null ? '' : this.opt.default;
}
return input;
};
Prompt.prototype.onEnd = function (state) {
this.status = 'answered';
this.answer = state.value;
// Re-render prompt
this.render();
this.screen.done();
this.done(state.value);
};
Prompt.prototype.onError = function (state) {
this.render(state.isValid);
this.rl.output.unmute();
};
/**
* When user type
*/
Prompt.prototype.onKeypress = function () {
this.render();
};