CODEWITHSUNDEEP
dart
ThinkDigital
ThinkDigital

Reputation: 3539

How to redirect stdin from keyboard in a dart script?

When testing a Dart pre-commit git hook script I wrote, I'm able to type into stdin as input when using a prompt. But when running it through git when committing, it runs through the input calls without prompting the user for input. Apparently, there's a workaround in certain languages, by Calling exec < /dev/tty which assigns standard input to the keyboard, but what about in Dart?

Upvotes: 0

Views: 107

Answers (1)

julemand101
julemand101

Reputation: 31209

You can just read directly from /dev/tty as a File instead of redirecting the stdin:

import 'dart:convert';
import 'dart:io';

void main() async {
  print('What is your name: ');

  final name = await getUserInput();

  print('Hello! Your name is $name');
}

Future<String> getUserInput() async =>
    File(Platform.isWindows ? r'conIN$' : '/dev/tty')
        .openRead()
        .transform(utf8.decoder)
        .transform(const LineSplitter())
        .first;

I found the following documentation for conIN$ which indicates that this always points to the console input on Windows: https://learn.microsoft.com/en-us/windows/console/console-handles

Upvotes: 1

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