Add flutter_web samples (#75)

web/_tool/verify_packages.dart

@@ -0,0 +1,87 @@
+// Copyright 2019 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:io';
+
+import 'package:path/path.dart' as p;
+
+const _ansiGreen = 32;
+const _ansiRed = 31;
+const _ansiMagenta = 35;
+
+void main() async {
+  final packageDirs = _listPackageDirs(Directory.current)
+      .map((path) => p.relative(path, from: Directory.current.path))
+      .toList();
+
+  print('Package dirs:\n${packageDirs.map((path) => '  $path').join('\n')}');
+
+  final results = <bool>[];
+  for (var i = 0; i < packageDirs.length; i++) {
+    final dir = packageDirs[i];
+    _logWrapped(_ansiMagenta, '\n$dir (${i + 1} of ${packageDirs.length})');
+    results.add(await _run(dir, 'pub', ['upgrade', '--no-precompile']));
+    results.add(await _run(
+      dir,
+      'dartanalyzer',
+      ['--fatal-infos', '--fatal-warnings', '.'],
+    ));
+    _printStatus(results);
+  }
+
+  if (results.any((v) => !v)) {
+    exitCode = 1;
+  }
+}
+
+void _printStatus(List<bool> results) {
+  var successCount = results.where((t) => t).length;
+  var success = (successCount == results.length);
+  var pct = 100 * successCount / results.length;
+
+  _logWrapped(success ? _ansiGreen : _ansiRed,
+      '$successCount of ${results.length} (${pct.toStringAsFixed(2)}%)');
+}
+
+void _logWrapped(int code, String message) {
+  print('\x1B[${code}m$message\x1B[0m');
+}
+
+Future<bool> _run(
+    String workingDir, String commandName, List<String> args) async {
+  var commandDescription = '`${([commandName]..addAll(args)).join(' ')}`';
+
+  _logWrapped(_ansiMagenta, '  Running $commandDescription');
+
+  var proc = await Process.start(
+    commandName,
+    args,
+    workingDirectory: Directory.current.path + '/' + workingDir,
+    mode: ProcessStartMode.inheritStdio,
+  );
+
+  var exitCode = await proc.exitCode;
+
+  if (exitCode != 0) {
+    _logWrapped(
+        _ansiRed, '  Failed! ($exitCode) – $workingDir – $commandDescription');
+    return false;
+  } else {
+    _logWrapped(_ansiGreen, '  Success! – $workingDir – $commandDescription');
+    return true;
+  }
+}
+
+Iterable<String> _listPackageDirs(Directory dir) sync* {
+  if (File('${dir.path}/pubspec.yaml').existsSync()) {
+    yield dir.path;
+  } else {
+    for (var subDir in dir
+        .listSync(followLinks: false)
+        .whereType<Directory>()
+        .where((d) => !Uri.file(d.path).pathSegments.last.startsWith('.'))) {
+      yield* _listPackageDirs(subDir);
+    }
+  }
+}