buildDartApplication: add workspace-package-config.py (#454169)

    echo "Installing dependencies"

    mkdir -p .dart_tool

    cp "$packageConfig" .dart_tool/package_config.json

    chmod u+w .dart_tool/package_config.json

    @python3@ @workspacePackageConfigScript@

    chmod u-w .dart_tool/package_config.json

    @python3@ @packageGraphScript@ > .dart_tool/package_graph.json

    packagePath() {

    substitutions.jq = "${jq}/bin/jq";

    substitutions.python3 = lib.getExe (python3.withPackages (ps: with ps; [ pyyaml ]));

    substitutions.packageGraphScript = ../../pub2nix/package-graph.py;

    substitutions.workspacePackageConfigScript = ../workspace-package-config.py;

  } ./dart-config-hook.sh;

  dartBuildHook = makeSetupHook {

    name = "dart-build-hook";

import json

import re

from pathlib import Path

import yaml

def main() -> None:

    with Path("pubspec.yaml").open("r", encoding="utf-8") as f:

        pubspec = yaml.load(f, Loader=yaml.CSafeLoader)

    if not pubspec.get("workspace"):

        return

    with Path(".dart_tool/package_config.json").open("r", encoding="utf-8") as f:

        package_config = json.load(f)

    for package_path in pubspec.get("workspace", []):

        with (Path(package_path) / "pubspec.yaml").open("r", encoding="utf-8") as f:

            package_pubspec = yaml.load(f, Loader=yaml.CSafeLoader)

        m = re.match(

            r"^[ \t]*(\^|>=|>)?[ \t]*([0-9]+\.[0-9]+)\.[0-9]+.*$",

            package_pubspec.get("environment", {}).get("sdk", ""),

        )

        if m:

            languageVersion = m.group(2)

        elif package_pubspec.get("environment", {}).get("sdk") == "any":

            languageVersion = "null"

        else:

            languageVersion = "2.7"

        if not any(

            pkg["name"] == package_pubspec["name"] for pkg in package_config["packages"]

        ):

            package_config["packages"].append({

                "name": package_pubspec["name"],

                "rootUri": Path(package_path).resolve().as_uri(),

                "packageUri": "lib/",

                "languageVersion": languageVersion,

            })

    with Path(".dart_tool/package_config.json").open("w", encoding="utf-8") as f:

        json.dump(package_config, f, sort_keys=True, indent=4)

if __name__ == "__main__":

    main()

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

index 0db7013..218276f 100644

--- a/bin/melos.dart

+++ b/bin/melos.dart

--- a/packages/melos/bin/melos.dart

+++ b/packages/melos/bin/melos.dart

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

+import 'dart:io';

 import 'package:cli_launcher/cli_launcher.dart';

  pname = "melos";

  inherit 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

  # hard code the path to the melos templates

  preBuild = ''

    substituteInPlace lib/src/common/utils.dart \

    substituteInPlace packages/melos/lib/src/common/utils.dart \

      --replace-fail "final melosPackageFileUri = await Isolate.resolvePackageUri(melosPackageUri);" "return \"$out\";"

    substituteInPlace lib/src/common/utils.dart \

    substituteInPlace packages/melos/lib/src/common/utils.dart \

      --replace-fail "return p.normalize('\''${melosPackageFileUri!.toFilePath()}/../..');" " "

    mkdir --parents $out

    cp --recursive templates $out/

    cp --recursive packages/melos/templates $out/

  '';

  meta = {