90 lines
1.8 KiB
Plaintext
90 lines
1.8 KiB
Plaintext
import process from 'node:process';
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import readline from 'node:readline';
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import {BufferListStream} from 'bl';
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const ASCII_ETX_CODE = 0x03; // Ctrl+C emits this code
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class StdinDiscarder {
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#requests = 0;
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#mutedStream = new BufferListStream();
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#ourEmit;
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#rl;
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constructor() {
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this.#mutedStream.pipe(process.stdout);
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const self = this; // eslint-disable-line unicorn/no-this-assignment
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this.#ourEmit = function (event, data, ...arguments_) {
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const {stdin} = process;
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if (self.#requests > 0 || stdin.emit === self.#ourEmit) {
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if (event === 'keypress') { // Fixes readline behavior
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return;
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}
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if (event === 'data' && data.includes(ASCII_ETX_CODE)) {
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process.emit('SIGINT');
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}
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Reflect.apply(self.#ourEmit, this, [event, data, ...arguments_]);
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} else {
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Reflect.apply(process.stdin.emit, this, [event, data, ...arguments_]);
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}
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};
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}
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start() {
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this.#requests++;
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if (this.#requests === 1) {
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this._realStart();
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}
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}
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stop() {
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if (this.#requests <= 0) {
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throw new Error('`stop` called more times than `start`');
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}
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this.#requests--;
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if (this.#requests === 0) {
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this._realStop();
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}
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}
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// TODO: Use private methods when targeting Node.js 14.
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_realStart() {
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// No known way to make it work reliably on Windows
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if (process.platform === 'win32') {
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return;
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}
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this.#rl = readline.createInterface({
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input: process.stdin,
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output: this.#mutedStream,
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});
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this.#rl.on('SIGINT', () => {
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if (process.listenerCount('SIGINT') === 0) {
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process.emit('SIGINT');
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} else {
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this.#rl.close();
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process.kill(process.pid, 'SIGINT');
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}
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});
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}
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_realStop() {
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if (process.platform === 'win32') {
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return;
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}
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this.#rl.close();
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this.#rl = undefined;
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}
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}
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const stdinDiscarder = new StdinDiscarder();
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export default stdinDiscarder;
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