Restore batch mode in the Dart-based Dart analyzer

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';
 import 'dart:convert';
 import 'dart:io';
 
 import 'package:analyzer/src/analyzer_impl.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/java_core.dart' show JavaSystem;
 import 'package:analyzer/options.dart';
 
 void main(args) {
   CommandLineOptions options = CommandLineOptions.parse(args);
   if (options.shouldBatch) {
     BatchRunner.runAsBatch(args, (List<String> args) {
       CommandLineOptions options = CommandLineOptions.parse(args);
-      _runAnalyzer(options);
+      return _runAnalyzer(options, false);
     });
   } else {
     _runAnalyzer(options);
   }
 }
 
-void _runAnalyzer(CommandLineOptions options) {
+_runAnalyzer(CommandLineOptions options, [bool async = true]) {
   int startTime = JavaSystem.currentTimeMillis();
   if (!options.machineFormat) {
     stdout.writeln("Analyzing ${options.sourceFiles}...");
   }
   ErrorSeverity allResult = ErrorSeverity.NONE;
   String sourcePath = options.sourceFiles[0];
   sourcePath = sourcePath.trim();
   // check that file exists
   if (!new File(sourcePath).existsSync()) {
     print('File not found: $sourcePath');
     exitCode = ErrorSeverity.ERROR.ordinal;
-    return;
+    return ErrorSeverity.ERROR;
   }
   // check that file is Dart file
   if (!AnalysisEngine.isDartFileName(sourcePath)) {
     print('$sourcePath is not a Dart file');
     exitCode = ErrorSeverity.ERROR.ordinal;
-    return;
+    return ErrorSeverity.ERROR;
   }
   // do analyze
   AnalyzerImpl analyzer = new AnalyzerImpl(sourcePath, options, startTime);
-  analyzer.analyze();
+  if (async) {
+    return analyzer.analyzeAsync();
+  } else {
+    return analyzer.analyzeSync();
+  }
 }
 
 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 42 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');
       }
     });
   }
 }