remove duplicate logs in transformer mode

Author: jakemac53

CHANGELOG.md

@@ -1,7 +1,10 @@
 # Changelog
 
+## 0.3.0+5
+- Fix duplicate logs issue when running as a BuilderTransformer.  
+
 ## 0.3.0+4
-- Add error and stack trace to log nessages from the BuilderTransformer.
+- Add error and stack trace to log messages from the BuilderTransformer.
 
 ## 0.3.0+3
 - Fixed BuilderTransformer so that logs are passed on to the TransformLogger.

lib/src/transformer/transformer.dart

@@ -75,6 +75,8 @@ abstract class BuilderTransformer implements Transformer, DeclaringTransformer {
           new BuildStepImpl(input, expected, reader, writer, input.id.package);
       Logger.root.level = Level.ALL;
       var logSubscription = buildStep.logger.onRecord.listen((LogRecord log) {
+        if (log.loggerName != buildStep.logger.fullName) return;
+
         if (log.level <= Level.CONFIG) {
           transform.logger.fine(_logRecordToMessage(log));
         } else if (log.level <= Level.INFO) {

pubspec.yaml

@@ -1,5 +1,5 @@
 name: build
-version: 0.3.0+4
+version: 0.3.0+5
 description: A build system for Dart.
 author: Dart Team <[email protected]>
 homepage: https://github.com/dart-lang/build

test/transformer/transformer_test.dart

@@ -121,12 +121,17 @@ void main() {
       new GenericBuilderTransformer([new LoggingCopyBuilder()])
     ],
   ], {
-    'a|web/a.txt': 'hello',
+    'a|web/a.txt': 'a',
+    'a|web/b.txt': 'b',
   }, {}, messages: [
     allOf(startsWith('warning: Warning!'), contains('SomeError'),
         contains('LoggingCopyBuilder.build')),
     allOf(startsWith('error: Error!'), contains('SomeError'),
         contains('LoggingCopyBuilder.build')),
+    allOf(startsWith('warning: Warning!'), contains('SomeError'),
+        contains('LoggingCopyBuilder.build')),
+    allOf(startsWith('error: Error!'), contains('SomeError'),
+        contains('LoggingCopyBuilder.build')),
   ]);
 }