anyhow 0.8.0

Versatile and idiomatic error handling capabilities to make your code safer, more maintainable, and errors easier to debug. Dart implementation of Rust's Result monad type and "anyhow" crate.

example/main.dart

import 'package:anyhow/anyhow.dart';

void main() {
  //Error.stackTraceDisplayFormat = StackTraceDisplayFormat.full;
  print(order("Bob", 1));
}

Result<String> order(String user, int orderNumber) {
  final result = makeFood(orderNumber).context("Could not order for user: $user.");
  switch (result) {
    // Could also use "if(result.isOk())" and "unwrap()"
    case Ok(:final ok):
      return Ok("Order of $ok is complete for $user");
    case Err():
      return result;
  }
}

Result<String> makeFood(int orderNumber) {
  if (orderNumber == 1) {
    return makeHamburger().context("Order number $orderNumber failed.");
  } else {
    return Ok("pasta");
  }
}

Result<String> makeHamburger() {
  return bail("Hmm something went wrong making the hamburger.");
}

//Output:
// Error: Could not order for user: Bob.
//
// Caused by:
//    0: Order number 1 failed.
//    1: Hmm something went wrong making the hamburger.
//
// StackTrace:
// #0      AnyhowResultExtensions.context (package:anyhow/src/anyhow/anyhow_extensions.dart:12:29)
// #1      order (package:anyhow/test/src/temp.dart:9:40)
// #2      main (package:anyhow/example/main.dart:5:9)
// ... <OMITTED FOR EXAMPLE>