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// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// A command that verifies that deferred libraries split the code as expected.
/// This tool checks that the output from dart2js meets a given specification,
/// given in a YAML file. The format of the YAML file is:
/// main:
/// packages:
/// - some_package
/// - other_package
/// foo:
/// packages:
/// - foo
/// - bar
/// baz:
/// packages:
/// - baz
/// - quux
/// The YAML file consists of a list of declarations, one for each deferred
/// part expected in the output. At least one of these parts must be named
/// "main"; this is the main part that contains the program entrypoint. Each
/// top-level part contains a list of package names that are expected to be
/// contained in that part. Any package that is not explicitly listed is
/// expected to be in the main part. For instance, in the example YAML above
/// the part named "baz" is expected to contain the packages "baz" and "quux".
/// The names for parts given in the specification YAML file (besides "main")
/// are arbitrary and just used for reporting when the output does not meet the
/// specification.
library dart2js_info.bin.deferred_library_check;
import 'dart:async';
import 'dart:io';
import 'package:args/command_runner.dart';
import 'package:dart2js_info/deferred_library_check.dart';
import 'package:dart2js_info/src/io.dart';
import 'package:yaml/yaml.dart';
import 'usage_exception.dart';
/// A command that computes the diff between two info files.
class DeferredLibraryCheck extends Command<void> with PrintUsageException {
final String name = "deferred_check";
final String description =
"Verify that deferred libraries are split as expected";
void run() async {
var args =;
if (args.length < 2) {
usageException('Missing arguments, expected: manifest.yaml');
var info = await infoFromFile(args[0]);
var manifest = await manifestFromFile(args[1]);
var failures = checkDeferredLibraryManifest(info, manifest);
if (failures.isNotEmpty) exitCode = 1;
Future manifestFromFile(String fileName) async {
var file = await new File(fileName).readAsString();
return loadYaml(file);