fuchsia_asset_builder.dart 3.46 KB
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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:async';

import 'package:args/args.dart';
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import 'package:flutter_tools/src/asset.dart' hide defaultManifestPath;
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import 'package:flutter_tools/src/base/context.dart';
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import 'package:flutter_tools/src/base/file_system.dart' as libfs;
import 'package:flutter_tools/src/base/io.dart';
import 'package:flutter_tools/src/base/platform.dart';
import 'package:flutter_tools/src/cache.dart';
import 'package:flutter_tools/src/context_runner.dart';
import 'package:flutter_tools/src/devfs.dart';
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import 'package:flutter_tools/src/bundle.dart';
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import 'package:flutter_tools/src/globals.dart';
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import 'package:flutter_tools/src/reporting/reporting.dart';
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const String _kOptionPackages = 'packages';
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const String _kOptionAsset = 'asset-dir';
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const String _kOptionManifest = 'manifest';
const String _kOptionAssetManifestOut = 'asset-manifest-out';
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const String _kOptionComponentName = 'component-name';
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const List<String> _kRequiredOptions = <String>[
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  _kOptionPackages,
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  _kOptionAsset,
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  _kOptionAssetManifestOut,
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  _kOptionComponentName,
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];

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Future<void> main(List<String> args) {
  return runInContext<void>(() => run(args), overrides: <Type, Generator>{
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    Usage: () => DisabledUsage(),
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  });
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}

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Future<void> writeFile(libfs.File outputFile, DevFSContent content) async {
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  outputFile.createSync(recursive: true);
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  final List<int> data = await content.contentsAsBytes();
  outputFile.writeAsBytesSync(data);
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}

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Future<void> run(List<String> args) async {
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  final ArgParser parser = ArgParser()
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    ..addOption(_kOptionPackages, help: 'The .packages file')
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    ..addOption(_kOptionAsset,
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        help: 'The directory where to put temporary files')
    ..addOption(_kOptionManifest, help: 'The manifest file')
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    ..addOption(_kOptionAssetManifestOut)
    ..addOption(_kOptionComponentName);
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  final ArgResults argResults = parser.parse(args);
  if (_kRequiredOptions
      .any((String option) => !argResults.options.contains(option))) {
    printError('Missing option! All options must be specified.');
    exit(1);
  }
  Cache.flutterRoot = platform.environment['FLUTTER_ROOT'];

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  final String assetDir = argResults[_kOptionAsset];
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  final AssetBundle assets = await buildAssets(
    manifestPath: argResults[_kOptionManifest] ?? defaultManifestPath,
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    assetDirPath: assetDir,
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    packagesPath: argResults[_kOptionPackages],
    includeDefaultFonts: false,
  );

  if (assets == null) {
    print('Unable to find assets.');
    exit(1);
  }

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  final List<Future<void>> calls = <Future<void>>[];
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  assets.entries.forEach((String fileName, DevFSContent content) {
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    final libfs.File outputFile = libfs.fs.file(libfs.fs.path.join(assetDir, fileName));
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    calls.add(writeFile(outputFile, content));
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  });
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  await Future.wait<void>(calls);
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  final String outputMan = argResults[_kOptionAssetManifestOut];
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  await writeFuchsiaManifest(assets, argResults[_kOptionAsset], outputMan, argResults[_kOptionComponentName]);
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}

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Future<void> writeFuchsiaManifest(AssetBundle assets, String outputBase, String fileDest, String componentName) async {
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  final libfs.File destFile = libfs.fs.file(fileDest);
  await destFile.create(recursive: true);
  final libfs.IOSink outFile = destFile.openWrite();

  for (String path in assets.entries.keys) {
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    outFile.write('data/$componentName/$path=$outputBase/$path\n');
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  }
  await outFile.flush();
  await outFile.close();
}