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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
const input = Deno.stdin;const output = Deno.stdout;const encoder = new TextEncoder();const decoder = new TextDecoder();const LF = "\n".charCodeAt(0); // ^J - Enter on Linuxconst CR = "\r".charCodeAt(0); // ^M - Enter on macOS and Windows (CRLF)const BS = "\b".charCodeAt(0); // ^H - Backspace on Linux and Windowsconst DEL = 0x7f; // ^? - Backspace on macOSconst CLR = encoder.encode("\r\u001b[K"); // Clear the current line
// The `cbreak` option is not supported on Windowsconst setRawOptions = Deno.build.os === "windows"  ? undefined  : { cbreak: true };
/** Options for {@linkcode promptSecret}. */export type PromptSecretOptions = {  /** A character to print instead of the user's input. */  mask?: string;  /** Clear the current line after the user's input. */  clear?: boolean;};
/** * Shows the given message and waits for the user's input. Returns the user's input as string. * This is similar to `prompt()` but it print user's input as `*` to prevent password from being shown. * Use an empty `mask` if you don't want to show any character. */export function promptSecret(  message = "Secret",  { mask = "*", clear }: PromptSecretOptions = {},): string | null {  if (!input.isTerminal()) {    return null;  }
  // Make the output consistent with the built-in prompt()  message += " ";  const callback = !mask ? undefined : (n: number) => {    output.writeSync(CLR);    output.writeSync(encoder.encode(`${message}${mask.repeat(n)}`));  };  output.writeSync(encoder.encode(message));
  Deno.stdin.setRaw(true, setRawOptions);  try {    return readLineFromStdinSync(callback);  } finally {    if (clear) {      output.writeSync(CLR);    } else {      output.writeSync(encoder.encode("\n"));    }    Deno.stdin.setRaw(false);  }}
// Slightly modified from Deno's runtime/js/41_prompt.js// This implementation immediately break on CR or LF and accept callback.// The original version waits LF when CR is received.// https://github.com/denoland/deno/blob/e4593873a9c791238685dfbb45e64b4485884174/runtime/js/41_prompt.js#L52-L77function readLineFromStdinSync(callback?: (n: number) => void): string {  const c = new Uint8Array(1);  const buf = [];
  while (true) {    const n = input.readSync(c);    if (n === null || n === 0) {      break;    }    if (c[0] === CR || c[0] === LF) {      break;    }    if (c[0] === BS || c[0] === DEL) {      buf.pop();    } else {      buf.push(c[0]!);    }    if (callback) callback(buf.length);  }  return decoder.decode(new Uint8Array(buf));}