Switch polymer's build.dart to use the new linter. This CL does the following

pkg/polymer/lib/deploy.dart

 // Copyright (c) 2013, 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.
 
 /**
  * Temporary deploy command used to create a version of the app that can be
  * compiled with dart2js and deployed. Following pub layout conventions, this
  * script will treat any HTML file under a package 'web/' and 'test/'
  * directories as entry points.
  *
  * From an application package you can run deploy by creating a small program
  * as follows:
  *
  *    import "package:polymer/deploy.dart" as deploy;
  *    main() => deploy.main();
  *
  * This library should go away once `pub deploy` can be configured to run
  * barback transformers.
+ *
+ * **Note**: If you already have a `build.dart` in your application, we

[Jennifer Messerly, 2013/09/10 04:16:51]

suggestion: move up front

[Siggi Cherem (dart-lang), 2013/09/11 01:45:26]

Done.

+ * recommend to use the `build_helper.dart` library instead.
  */
 library polymer.deploy;
 
 import 'dart:async';
-import 'dart:convert';
 import 'dart:io';
 
-import 'package:barback/barback.dart';
 import 'package:path/path.dart' as path;
-import 'package:polymer/src/transform.dart' show phases;
-import 'package:stack_trace/stack_trace.dart';
-import 'package:yaml/yaml.dart';
+import 'package:polymer/src/transform.dart';
+import 'package:polymer/src/barback_helper.dart';
 import 'package:args/args.dart';
 
 main() {
   var args = _parseArgs(new Options().arguments);
-  if (args == null) return;
+  if (args == null) exit(1);
 
   var test = args['test'];
-  if (test != null) {
-    _initForTest(test);
-  }
+  var outDir = args['out'];
+  var options = (test == null)
+    ? new BarbackOptions(createDeployPhases(new TransformOptions()), outDir)
+    : _createTestOptions(test, outDir);
+  if (options == null) exit(1);
 
-  print('polymer/deploy.dart: creating a deploy target for "$_currentPackage"');
-  var outDir = args['out'];
-  _run(outDir, test != null).then(
-      (_) => print('Done! All files written to "$outDir"'));
+  print('polymer/deploy.dart: creating a deploy target for '
+      '"${options.currentPackage}"');
+
+  runBarback(options)
+      .then((_) => print('Done! All files written to "$outDir"'))
+      .catchError(_reportErrorAndExit);
 }
 
-// TODO(jmesserly): the current deploy/barback architecture is very unfriendly
-// to deploying a single test. We need to fix it somehow but it isn't clear yet.
-void _initForTest(String testFile) {
+BarbackOptions _createTestOptions(String testFile, String outDir) {
   var testDir = path.normalize(path.dirname(testFile));
 
   // A test must be allowed to import things in the package.
   // So we must find its package root, given the entry point. We can do this
   // by walking up to find pubspec.yaml.
   var pubspecDir = _findDirWithFile(path.absolute(testDir), 'pubspec.yaml');
   if (pubspecDir == null) {
     print('error: pubspec.yaml file not found, please run this script from '
         'your package root directory or a subdirectory.');
-    exit(1);
+    return null;
   }
 
-  _currentPackage = '_test';
-  _packageDirs = {'_test' : pubspecDir};
+  var phases = createDeployPhases(new TransformOptions(
+        '_test', [path.relative(testFile, from: pubspecDir)]));
+  return new BarbackOptions(phases, outDir,
+      currentPackage: '_test',
+      packageDirs: {'_test' : pubspecDir},
+      transformTests: true);
 }
 
 String _findDirWithFile(String dir, String filename) {
   while (!new File(path.join(dir, filename)).existsSync()) {
     var parentDir = path.dirname(dir);
     // If we reached root and failed to find it, bail.
     if (parentDir == dir) return null;
     dir = parentDir;
   }
   return dir;
 }
 
-/**
- * API exposed for testing purposes. Runs this deploy command but prentend that
- * the sources under [webDir] belong to package 'test'.
- */
-Future runForTest(String webDir, String outDir) {
-  _currentPackage = 'test';
-
-  // associate package dirs with their location in the repo:
-  _packageDirs = {'test' : '.'};
-  _addPackages('..');
-  _addPackages('../third_party');
-  _addPackages('../../third_party/pkg');
-  return _run(webDir, outDir);
+void _reportErrorAndExit(e) {
+  var trace = getAttachedStackTrace(e);
+  print('Uncaught error: $e');
+  if (trace != null) print(trace);
+  exit(1);
 }
 
-_addPackages(String dir) {
-  for (var packageDir in new Directory(dir).listSync().map((d) => d.path)) {
-    _packageDirs[path.basename(packageDir)] = packageDir;
-  }
-}
-
-Future _run(String outDir, bool includeTests) {

[Siggi Cherem (dart-lang), 2013/09/10 03:40:57]

most code below here basically moved to lib/src/barback_helper.dart

-  var barback = new Barback(new _PolymerDeployProvider());
-  _initializeBarback(barback, includeTests);
-  _attachListeners(barback);
-  return _emitAllFiles(barback, 'web', outDir).then(
-      (_) => includeTests ? _emitAllFiles(barback, 'test', outDir) : null);
-}
-
-/** Tell barback which transformers to use and which assets to process. */
-void _initializeBarback(Barback barback, bool includeTests) {
-  var assets = [];
-  void addAssets(String package, String subDir) {
-    for (var filepath in _listDir(package, subDir)) {
-      assets.add(new AssetId(package, filepath));
-    }
-  }
-
-  for (var package in _packageDirs.keys) {
-    // Do not process packages like 'polymer' where there is nothing to do.
-    if (_ignoredPackages.contains(package)) continue;
-    barback.updateTransformers(package, phases);
-
-    // notify barback to process anything under 'lib' and 'asset'
-    addAssets(package, 'lib');
-    addAssets(package, 'asset');
-  }
-
-  // In case of the current package, include also 'web'.
-  addAssets(_currentPackage, 'web');
-  if (includeTests) addAssets(_currentPackage, 'test');
-
-  barback.updateSources(assets);
-}
-
-/** Return the relative path of each file under [subDir] in a [package]. */
-Iterable<String> _listDir(String package, String subDir) {
-  var packageDir = _packageDirs[package];
-  if (packageDir == null) return const [];
-  var dir = new Directory(path.join(packageDir, subDir));
-  if (!dir.existsSync()) return const [];
-  return dir.listSync(recursive: true, followLinks: false)
-      .where((f) => f is File)
-      .map((f) => path.relative(f.path, from: packageDir));
-}
-
-/** Attach error listeners on [barback] so we can report errors. */
-void _attachListeners(Barback barback) {
-  // Listen for errors and results
-  barback.errors.listen((e) {
-    var trace = getAttachedStackTrace(e);
-    if (trace != null) {
-      print(Trace.format(trace));
-    }
-    print('error running barback: $e');
-    exit(1);
-  });
-
-  barback.results.listen((result) {
-    if (!result.succeeded) {
-      print("build failed with errors: ${result.errors}");
-      exit(1);
-    }
-  });
-}
-
-/** Ensure [dirpath] exists. */
-void _ensureDir(var dirpath) {
-  new Directory(dirpath).createSync(recursive: true);
-}
-
-/**
- * Emits all outputs of [barback] and copies files that we didn't process (like
- * polymer's libraries).
- */
-Future _emitAllFiles(Barback barback, String webDir, String outDir) {
-  return barback.getAllAssets().then((assets) {
-    // Copy all the assets we transformed
-    var futures = [];
-    for (var asset in assets) {
-      var id = asset.id;
-      var filepath;
-      if (id.package == _currentPackage && id.path.startsWith('$webDir/')) {
-        filepath = path.join(outDir, id.path);
-      } else if (id.path.startsWith('lib/')) {
-        filepath = path.join(outDir, webDir, 'packages', id.package,
-            id.path.substring(4));
-      } else {
-        // TODO(sigmund): do something about other assets?
-        continue;
-      }
-
-      _ensureDir(path.dirname(filepath));
-      var writer = new File(filepath).openWrite();
-      futures.add(writer.addStream(asset.read()).then((_) => writer.close()));
-    }
-    return Future.wait(futures);
-  }).then((_) {
-    // Copy also all the files we didn't process
-    var futures = [];
-    for (var package in _ignoredPackages) {
-      for (var relpath in _listDir(package, 'lib')) {
-        var inpath = path.join(_packageDirs[package], relpath);
-        var outpath = path.join(outDir, webDir, 'packages', package,
-            relpath.substring(4));
-        _ensureDir(path.dirname(outpath));
-
-        var writer = new File(outpath).openWrite();
-        futures.add(writer.addStream(new File(inpath).openRead())
-          .then((_) => writer.close()));
-      }
-    }
-    return Future.wait(futures);
-  });
-}
-
-/** A simple provider that reads files directly from the pub cache. */
-class _PolymerDeployProvider implements PackageProvider {
-
-  Iterable<String> get packages => _packageDirs.keys;
-  _PolymerDeployProvider();
-
-  Future<Asset> getAsset(AssetId id) =>
-      new Future.value(new Asset.fromPath(id, path.join(
-              _packageDirs[id.package],
-              // Assets always use the posix style paths
-              path.joinAll(path.posix.split(id.path)))));
-}
-
-
-/** The current package extracted from the pubspec.yaml file. */
-String _currentPackage = () {
-  var pubspec = new File('pubspec.yaml');
-  if (!pubspec.existsSync()) {
-    print('error: pubspec.yaml file not found, please run this script from '
-        'your package root directory.');
-    return null;
-  }
-  return loadYaml(pubspec.readAsStringSync())['name'];
-}();
-
-/**
- * Maps package names to the path in the file system where to find the sources
- * of such package. This map will contain an entry for the current package and
- * everything it depends on (extracted via `pub list-pacakge-dirs`).
- */
-Map<String, String> _packageDirs = () {
-  var pub = path.join(path.dirname(new Options().executable),
-      Platform.isWindows ? 'pub.bat' : 'pub');
-  var result = Process.runSync(pub, ['list-package-dirs']);
-  if (result.exitCode != 0) {
-    print("unexpected error invoking 'pub':");
-    print(result.stdout);
-    print(result.stderr);
-    exit(result.exitCode);
-  }
-  var map = JSON.decode(result.stdout)["packages"];
-  map.forEach((k, v) { map[k] = path.dirname(v); });
-  map[_currentPackage] = '.';
-  return map;
-}();
-
-/**
- * Internal packages used by polymer which we can copy directly to the output
- * folder without having to process them with barback.
- */
-// TODO(sigmund): consider computing this list by recursively parsing
-// pubspec.yaml files in the [_packageDirs].
-final Set<String> _ignoredPackages =
-    (const [ 'analyzer_experimental', 'args', 'barback', 'browser', 'csslib',
-             'custom_element', 'fancy_syntax', 'html5lib', 'html_import', 'js',
-             'logging', 'mdv', 'meta', 'mutation_observer', 'observe', 'path',
-             'polymer', 'polymer_expressions', 'serialization', 'shadow_dom',
-             'source_maps', 'stack_trace', 'unittest',
-             'unmodifiable_collection', 'yaml'
-           ]).toSet();
-
 ArgResults _parseArgs(arguments) {
   var parser = new ArgParser()
       ..addFlag('help', abbr: 'h', help: 'Displays this help message.',
           defaultsTo: false, negatable: false)
-      ..addOption('out', abbr: 'o', help: 'Directory where to generated files.',
+      ..addOption('out', abbr: 'o', help: 'Directory where to generate files.',

[Jennifer Messerly, 2013/09/10 04:16:51]

"directory to generate files" ?
or "directory to generate files into"

[Siggi Cherem (dart-lang), 2013/09/11 01:45:26]

Done.

           defaultsTo: 'out')
       ..addOption('test', help: 'Deploy the test at the given path.\n'
           'Note: currently this will deploy all tests in its directory,\n'
           'but it will eventually deploy only the specified test.');
   try {
     var results = parser.parse(arguments);
     if (results['help']) {
       _showUsage(parser);
       return null;
     }
     return results;
   } on FormatException catch (e) {
     print(e.message);
     _showUsage(parser);
     return null;
   }
 }
 
 _showUsage(parser) {
-  print('Usage: dart package:polymer/deploy.dart [options]');
+  print('Usage: dart --package-root=packages/ '

[Jennifer Messerly, 2013/09/10 04:16:51]

is the --package-root actually required? even for packages/ ?

[Siggi Cherem (dart-lang), 2013/09/11 01:45:26]

Yeah, this is because the 'package-root' is resolved from the entrypoint,
without any regard of the current working dir. Maybe worth filing a bug about
it?

The current error looks like this:
Unable to open file: package:polymer/packages/polymer/deploy.dart

Which seems as if they are treating "package:polymer/deploy.dart" as a path, and
resolving package-root to: "package:polymer/packages"

pretty wacky.

[Jennifer Messerly, 2013/09/11 20:07:54]

strange :| perhaps we should just tell people to run 

packages/polymer/deploy.dart? or does that have the same problem?

+      'package:polymer/deploy.dart [options]');
   print(parser.getUsage());
 }