set exitCode on errors or warnings

pkg/analyzer/bin/analyzer.dart

 #!/usr/bin/env 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.
 
 /** The entry point for the analyzer. */
 library analyzer;
 
 import 'dart:async';
@@ skipping 52 matching lines @@
     PerformanceStatistics.reset();
     startTime = JavaSystem.currentTimeMillis();
     analyzer = new AnalyzerImpl(sourcePath, options, startTime);
     return analyzer.analyzeSync();
   }
   int startTime = JavaSystem.currentTimeMillis();
   AnalyzerImpl analyzer = new AnalyzerImpl(sourcePath, options, startTime);
   if (async) {
     return analyzer.analyzeAsync();
   } else {
-    return analyzer.analyzeSync();
+    var errorSeverity = analyzer.analyzeSync();
+    if (errorSeverity == ErrorSeverity.ERROR) {
+      exitCode = errorSeverity.ordinal;
+    }
+    if (options.warningsAreFatal && errorSeverity == ErrorSeverity.WARNING) {
+      exitCode = errorSeverity.ordinal;
+    }
+    return errorSeverity;
   }
 }
 
 typedef ErrorSeverity BatchRunnerHandler(List<String> args);
 
 /// Provides a framework to read command line options from stdin and feed them to a callback.
 class BatchRunner {
   /**
    * Run the tool in 'batch' mode, receiving command lines through stdin and returning pass/fail
    * status through stdout. This feature is intended for use in unit testing.
@@ skipping 41 matching lines @@
         stdout.writeln('>>> TEST $resultPassString ${stopwatch.elapsedMilliseconds}ms');
       } catch (e, stackTrace) {
         stderr.writeln(e);
         stderr.writeln(stackTrace);
         stderr.writeln('>>> EOF STDERR');
         stdout.writeln('>>> TEST CRASH');
       }
     });
   }
 }