std/node: add readline module

[EvanHahn]

For completeness, we should add a polyfill for Node's readline module.

[aggmoulik]

Hello @EvanHahn @bartlomieju I want to work on this issue. How can I proceed with this?

[EvanHahn]

I'll defer to @bartlomieju on this one as I'm not a Deno maintainer.

I recently put up a pull request for util.callbackify in #5415, which may be helpful as inspiration. I copied the tests and source code from the Node source code, and then made modifications as needed.

Again, I'm not a maintainer, but maybe that info will help.

[sant123]

Hi, I wrote this code with Deno.stdin in mind.

const decoder = new TextDecoder();

export async function readLine() {
  let stringInput = '';

  while (true) {
    const buffer = new Uint8Array(1);
    const readStatus = await Deno.stdin.read(buffer);

    // Found EOL
    if (readStatus == null) {
      break;
    }

    const char = decoder.decode(buffer);

    // On Enter, exit
    if (char === '\n') {
      break;
    }

    stringInput += char;
  }

  return stringInput;
}

Credit to @lucacasonato #3614 (comment)

[stale]

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