69 lines
1.8 KiB
JavaScript
69 lines
1.8 KiB
JavaScript
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'use strict';
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const readline = require('readline');
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const { action } = require('../util');
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const EventEmitter = require('events');
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const { beep, cursor } = require('sisteransi');
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const color = require('kleur');
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/**
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* Base prompt skeleton
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* @param {Stream} [opts.stdin] The Readable stream to listen to
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* @param {Stream} [opts.stdout] The Writable stream to write readline data to
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*/
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class Prompt extends EventEmitter {
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constructor(opts={}) {
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super();
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this.firstRender = true;
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this.in = opts.stdin || process.stdin;
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this.out = opts.stdout || process.stdout;
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this.onRender = (opts.onRender || (() => void 0)).bind(this);
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const rl = readline.createInterface({ input:this.in, escapeCodeTimeout:50 });
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readline.emitKeypressEvents(this.in, rl);
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if (this.in.isTTY) this.in.setRawMode(true);
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const isSelect = [ 'SelectPrompt', 'MultiselectPrompt' ].indexOf(this.constructor.name) > -1;
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const keypress = (str, key) => {
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let a = action(key, isSelect);
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if (a === false) {
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this._ && this._(str, key);
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} else if (typeof this[a] === 'function') {
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this[a](key);
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} else {
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this.bell();
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}
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};
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this.close = () => {
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this.out.write(cursor.show);
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this.in.removeListener('keypress', keypress);
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if (this.in.isTTY) this.in.setRawMode(false);
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rl.close();
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this.emit(this.aborted ? 'abort' : this.exited ? 'exit' : 'submit', this.value);
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this.closed = true;
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};
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this.in.on('keypress', keypress);
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}
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fire() {
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this.emit('state', {
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value: this.value,
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aborted: !!this.aborted,
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exited: !!this.exited
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});
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}
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bell() {
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this.out.write(beep);
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}
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render() {
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this.onRender(color);
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if (this.firstRender) this.firstRender = false;
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}
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}
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module.exports = Prompt;
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