mirror of
https://github.com/denoland/deno.git
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67 lines
1.4 KiB
JavaScript
67 lines
1.4 KiB
JavaScript
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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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((window) => {
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const { stdin, stdout } = window.__bootstrap.files;
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const { isatty } = window.__bootstrap.tty;
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const LF = "\n".charCodeAt(0);
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const encoder = new TextEncoder();
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const decoder = new TextDecoder();
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function alert(message = "Alert") {
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if (!isatty(stdin.rid)) {
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return;
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}
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stdout.writeSync(encoder.encode(`${message} [Enter] `));
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readLineFromStdinSync();
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}
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function confirm(message = "Confirm") {
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if (!isatty(stdin.rid)) {
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return false;
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}
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stdout.writeSync(encoder.encode(`${message} [y/N] `));
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const answer = readLineFromStdinSync();
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return answer === "Y" || answer === "y";
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}
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function prompt(message = "Prompt", defaultValue) {
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defaultValue ??= null;
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if (!isatty(stdin.rid)) {
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return null;
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}
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stdout.writeSync(encoder.encode(`${message} `));
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if (defaultValue) {
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stdout.writeSync(encoder.encode(`[${defaultValue}] `));
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}
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return readLineFromStdinSync() || defaultValue;
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}
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function readLineFromStdinSync() {
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const c = new Uint8Array(1);
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const buf = [];
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while (true) {
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const n = stdin.readSync(c);
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if (n === 0 || c[0] === LF) {
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break;
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}
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buf.push(c[0]);
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}
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return decoder.decode(new Uint8Array(buf));
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}
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window.__bootstrap.prompt = {
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alert,
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confirm,
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prompt,
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};
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})(this);
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