add --x-package-warnings-prefix option to dartanalyzer

pkg/analyzer_cli/lib/src/options.dart

 // 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.
 
 library analyzer_cli.src.options;
 
 import 'dart:io';
 
 import 'package:analyzer_cli/src/driver.dart';
 import 'package:args/args.dart';
@@ skipping 93 matching lines @@
   /// The path to a file to write a performance log.
   /// (Or null if not enabled.)
   final String perfReport;
 
   /// Batch mode (for unit testing)
   final bool shouldBatch;
 
   /// Whether to show package: warnings
   final bool showPackageWarnings;
 
+  /// If not null, show package: warnings only for matching packages.
+  final String showPackageWarningsPrefix;
+
   /// Whether to show SDK warnings
   final bool showSdkWarnings;
 
   /// The source files to analyze
   final List<String> sourceFiles;
 
   /// Whether to treat warnings as fatal
   final bool warningsAreFatal;
 
   /// Whether to use strong static checking.
@@ skipping 20 matching lines @@
         packageMode = args['package-mode'],
         packageModePath = args['package-mode-path'],
         packageName = args['package-name'],
         packageSummaryInputs = _parsePackageSummaryInputs(args),
         packageSummaryOnly = args['package-summary-only'],
         packageSummaryOutput = args['package-summary-output'],
         packageConfigPath = args['packages'],
         packageRootPath = args['package-root'],
         perfReport = args['x-perf-report'],
         shouldBatch = args['batch'],
-        showPackageWarnings =
-            args['show-package-warnings'] || args['package-warnings'],
+        showPackageWarnings = args['show-package-warnings'] ||
+            args['package-warnings'] ||
+            args['x-package-warnings-prefix'] != null,
+        showPackageWarningsPrefix = args['x-package-warnings-prefix'],
         showSdkWarnings = args['show-sdk-warnings'] || args['warnings'],
         sourceFiles = args.rest,
         warningsAreFatal = args['fatal-warnings'],
         strongMode = args['strong'];
 
   /// Parse [args] into [CommandLineOptions] describing the specified
   /// analyzer options. In case of a format error, calls [printAndFail], which
   /// by default prints an error message to stderr and exits.
   static CommandLineOptions parse(List<String> args,
       [printAndFail = printAndFail]) {
@@ skipping 108 matching lines @@
           defaultsTo: false,
           negatable: false)
       ..addFlag('warnings',
           help: 'Show warnings from SDK imports.',
           defaultsTo: false,
           negatable: false)
       ..addFlag('show-sdk-warnings',
           help: 'Show warnings from SDK imports (deprecated).',
           defaultsTo: false,
           negatable: false)
+      ..addOption('x-package-warnings-prefix',
+          help:
+              'Show warnings from package: imports that match the given prefix',
+          hide: true)
       ..addOption('x-perf-report',
           help: 'Writes a performance report to the given file (experimental).')
       ..addFlag('help',
           abbr: 'h',
           help: 'Display this help message.',
           defaultsTo: false,
           negatable: false)
       ..addOption('url-mapping',
           help: '--url-mapping=libraryUri,/path/to/library.dart directs the '
               'analyzer to use "library.dart" as the source for an import '
@@ skipping 288 matching lines @@
 
   int _getNextFlagIndex(args, i) {
     for (; i < args.length; ++i) {
       if (args[i].startsWith('--')) {
         return i;
       }
     }
     return i;
   }
 }