How do I get the directory of the current script, in Dart?

Question

I want to know what the script's directory is. I have a command-line Dart script.

Answer 1

If you're doing this for a console based app (e.g. in a unit test) and intend to use the output to open a file for reading or writing, it's more helpful to use Platform.script.path:

import "package:path/path.dart" show dirname, join;
import 'dart:io' show Platform;

main() {
  print(join(dirname(Platform.script.path), 'test_data_file.dat'));
}

The result of that command can be used with a File object and be opened/read (e.g. if you have a unit test that needs to read/compare sample data, or a console program that needs to open a file relative to the current script for some other reason).

Answer 2

The easiest way to find the script's directory is to use the path package.

import "package:path/path.dart" show dirname;
import 'dart:io' show Platform;

main() {
  print(dirname(Platform.script.toString()));
}

Put the path package into your pubspec.yaml:

dependencies:
  path: any

And be sure to run pub get to download and link the path package.