melos: init at 6.2.0 (#334461)

diff --git a/bin/melos.dart b/bin/melos.dart

index 0db7013..218276f 100644

--- a/bin/melos.dart

+++ b/bin/melos.dart

@@ -1,11 +1,37 @@

+import 'dart:io';

 import 'package:cli_launcher/cli_launcher.dart';

 import 'package:melos/src/command_runner.dart';

-Future<void> main(List<String> arguments) async => launchExecutable(

-      arguments,

-      LaunchConfig(

+Future<void> main(List<String> arguments) async {

+  final melosYamlPath = findMelosYaml();

+

+  if (melosYamlPath == null) {

+    print('Error: melos.yaml not found in the project.');

+    // Handle the error as needed

+    return;

+  }

+

+  melosEntryPoint(

+    arguments,

+    LaunchContext(

+      directory: Directory.current,

+      localInstallation: ExecutableInstallation(

         name: ExecutableName('melos'),

-        launchFromSelf: false,

-        entrypoint: melosEntryPoint,

+        isSelf: false,

+        packageRoot: melosYamlPath,

       ),

-    );

+    ),

+  );

+}

+

+Directory? findMelosYaml() {

+  var directory = Directory.current;

+  while (directory.path != directory.parent.path) {

+    final melosYamlPath = '${directory.path}/melos.yaml';

+    if (File(melosYamlPath).existsSync()) {

+      return directory;

+    }

+    directory = directory.parent;

+  }

+  return null;

+}

{

  lib,

  fetchFromGitHub,

  buildDartApplication,

}:

let

  pname = "melos";

  version = "6.2.0";

  src = fetchFromGitHub {

    owner = "invertase";

    repo = "melos";

    rev = "melos-v${version}";

    hash = "sha256-00K/LwrwjvO4LnXM2PDooQMJ6sXcJy9FBErtEwoMZlM=";

  };

in

buildDartApplication {

  inherit pname version src;

  sourceRoot = "${src.name}/packages/melos";

  patches = [

    # This patch (created a melos 6.1.0) modify the method melos use to find path to the root of the projects.

    # It is needed because when melos is in the nixstore, it break it and fail to find the projects root with melos.yaml

    ./add-generic-main.patch

  ];

  pubspecLock = lib.importJSON ./pubspec.lock.json;

  # hard code the path to the melos templates

  preBuild = ''

    substituteInPlace lib/src/common/utils.dart --replace-fail "final melosPackageFileUri = await Isolate.resolvePackageUri(melosPackageUri);" "return \"$out\";"

    substituteInPlace lib/src/common/utils.dart --replace-fail "return p.normalize('\''${melosPackageFileUri!.toFilePath()}/../..');" " "

    mkdir -p $out

    cp -r templates $out/

  '';

  meta = {

    homepage = "https://github.com/invertase/melos";

    description = "A tool for managing Dart projects with multiple packages. With IntelliJ and Vscode IDE support. Supports automated versioning, changelogs & publishing via Conventional Commits. ";

    mainProgram = "melos";

    license = lib.licenses.asl20;

    maintainers = [ lib.maintainers.eymeric ];

  };

}