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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { core, primordials } from "ext:core/mod.js";
const {
ArrayPrototypePush,
StringPrototypeCharCodeAt,
Uint8Array,
} = primordials;
import { isatty } from "ext:runtime/40_tty.js";
import { stdin } from "ext:deno_io/12_io.js";
const LF = StringPrototypeCharCodeAt("\n", 0);
const CR = StringPrototypeCharCodeAt("\r", 0);
function alert(message = "Alert") {
if (!isatty(stdin.rid)) {
return;
}
core.print(`${message} [Enter] `, false);
readLineFromStdinSync();
}
function confirm(message = "Confirm") {
if (!isatty(stdin.rid)) {
return false;
}
core.print(`${message} [y/N] `, false);
const answer = readLineFromStdinSync();
return answer === "Y" || answer === "y";
}
function prompt(message = "Prompt", defaultValue) {
defaultValue ??= null;
if (!isatty(stdin.rid)) {
return null;
}
if (defaultValue) {
message += ` [${defaultValue}]`;
}
message += " ";
// output in one shot to make the tests more reliable
core.print(message, false);
return readLineFromStdinSync() || defaultValue;
}
function readLineFromStdinSync() {
const c = new Uint8Array(1);
const buf = [];
while (true) {
const n = stdin.readSync(c);
if (n === null || n === 0) {
break;
}
if (c[0] === CR) {
const n = stdin.readSync(c);
if (c[0] === LF) {
break;
}
ArrayPrototypePush(buf, CR);
if (n === null || n === 0) {
break;
}
}
if (c[0] === LF) {
break;
}
ArrayPrototypePush(buf, c[0]);
}
return core.decode(new Uint8Array(buf));
}
export { alert, confirm, prompt };
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