110 lines
2.2 KiB
JavaScript
110 lines
2.2 KiB
JavaScript
'use strict';
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/**
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* `input` type prompt
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*/
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const chalk = require('chalk');
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const { map, takeUntil } = require('rxjs/operators');
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const Base = require('./base');
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const observe = require('../utils/events');
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class InputPrompt extends 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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_run(cb) {
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this.done = cb;
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// Once user confirm (enter key)
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const events = observe(this.rl);
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const submit = events.line.pipe(map(this.filterInput.bind(this)));
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const 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
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.pipe(takeUntil(validation.success))
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.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 {InputPrompt} self
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*/
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render(error) {
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let bottomContent = '';
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let appendContent = '';
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let message = this.getQuestion();
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const { transformer } = this.opt;
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const isFinal = this.status === 'answered';
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if (isFinal) {
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appendContent = this.answer;
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} else {
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appendContent = this.rl.line;
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}
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if (transformer) {
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message += transformer(appendContent, this.answers, { isFinal });
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} else {
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message += isFinal ? chalk.cyan(appendContent) : appendContent;
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}
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if (error) {
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bottomContent = chalk.red('>> ') + error;
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}
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this.screen.render(message, bottomContent);
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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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filterInput(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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onEnd(state) {
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this.answer = state.value;
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this.status = 'answered';
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// Re-render prompt
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this.render();
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this.screen.done();
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this.done(state.value);
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}
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onError({ value = '', isValid }) {
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this.rl.line += value;
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this.rl.cursor += value.length;
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this.render(isValid);
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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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onKeypress() {
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this.status = 'touched';
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this.render();
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}
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}
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module.exports = InputPrompt;
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