mirror of https://github.com/nodejs/node.git
107 lines
1.9 KiB
JavaScript
107 lines
1.9 KiB
JavaScript
/**
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* `input` type prompt
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*/
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var _ = require("lodash");
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var util = require("util");
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var chalk = require("chalk");
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var Base = require("./base");
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var utils = require("../utils/utils");
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var observe = require("../utils/events");
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/**
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* Module exports
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*/
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module.exports = Prompt;
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/**
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* Constructor
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*/
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function Prompt() {
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return Base.apply( this, arguments );
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}
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util.inherits( Prompt, Base );
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/**
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* Start the Inquiry session
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* @param {Function} cb Callback when prompt is done
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* @return {this}
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*/
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Prompt.prototype._run = function( cb ) {
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this.done = cb;
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// Once user confirm (enter key)
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var events = observe(this.rl);
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var submit = events.line.map( this.filterInput.bind(this) );
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var validation = this.handleSubmitEvents( submit );
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validation.success.forEach( this.onEnd.bind(this) );
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validation.error.forEach( this.onError.bind(this) );
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events.keypress.takeUntil( validation.success ).forEach( this.onKeypress.bind(this) );
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// Init
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this.render();
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return this;
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};
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/**
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* Render the prompt to screen
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* @return {Prompt} self
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*/
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Prompt.prototype.render = function() {
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var message = this.getQuestion();
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utils.writeMessage( this, message );
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return this;
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};
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/**
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* When user press `enter` key
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*/
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Prompt.prototype.filterInput = function( input ) {
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if ( !input ) {
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return this.opt.default != null ? this.opt.default : "";
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}
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return input;
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};
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Prompt.prototype.onEnd = function( state ) {
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this.filter( state.value, function( filteredValue ) {
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this.status = "answered";
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// Re-render prompt
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this.clean(1).render();
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// Render answer
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this.write( chalk.cyan(filteredValue) + "\n" );
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this.done( state.value );
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}.bind(this));
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};
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Prompt.prototype.onError = function( state ) {
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this.error( state.isValid ).clean().render();
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};
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/**
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* When user press a key
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*/
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Prompt.prototype.onKeypress = function() {
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this.cacheCursorPos();
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this.clean().render().write( this.rl.line );
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this.restoreCursorPos();
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};
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