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prompt.js
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Mon, Feb 10, 07:25

prompt.js
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'use strict';
const readline = require('readline');
const _require = require('../util'),
action = _require.action;
const EventEmitter = require('events');
const _require2 = require('sisteransi'),
beep = _require2.beep,
cursor = _require2.cursor;
const color = require('kleur');
/**
* Base prompt skeleton
* @param {Stream} [opts.stdin] The Readable stream to listen to
* @param {Stream} [opts.stdout] The Writable stream to write readline data to
*/
class Prompt extends EventEmitter {
constructor(opts = {}) {
super();
this.firstRender = true;
this.in = opts.stdin || process.stdin;
this.out = opts.stdout || process.stdout;
this.onRender = (opts.onRender || (() => void 0)).bind(this);
const rl = readline.createInterface({
input: this.in,
escapeCodeTimeout: 50
});
readline.emitKeypressEvents(this.in, rl);
if (this.in.isTTY) this.in.setRawMode(true);
const isSelect = ['SelectPrompt', 'MultiselectPrompt'].indexOf(this.constructor.name) > -1;
const keypress = (str, key) => {
let a = action(key, isSelect);
if (a === false) {
this._ && this._(str, key);
} else if (typeof this[a] === 'function') {
this[a](key);
} else {
this.bell();
}
};
this.close = () => {
this.out.write(cursor.show);
this.in.removeListener('keypress', keypress);
if (this.in.isTTY) this.in.setRawMode(false);
rl.close();
this.emit(this.aborted ? 'abort' : this.exited ? 'exit' : 'submit', this.value);
this.closed = true;
};
this.in.on('keypress', keypress);
}
fire() {
this.emit('state', {
value: this.value,
aborted: !!this.aborted,
exited: !!this.exited
});
}
bell() {
this.out.write(beep);
}
render() {
this.onRender(color);
if (this.firstRender) this.firstRender = false;
}
}
module.exports = Prompt;

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