frog: life is better with colors :)

frog/world.dart

 // Copyright (c) 2011, 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 one true [World]. */
 World world;
 
 /**
  * Experimental phase to enable await, only set when using the
  * await/awaitc.dart entrypoint.
@@ skipping 368 matching lines @@
     }
 
     var codeWriter = new CodeWriter();
     gen = new WorldGenerator(main, codeWriter);
     gen.run();
     jsBytesWritten = codeWriter.text.length;
   }
 
   // ********************** Message support ***********************
 
-  void _message(String message, SourceSpan span, SourceSpan span1,
-      SourceSpan span2, bool throwing) {
-    var text = message;
+  void _message(String color, String prefix, String message,
+      SourceSpan span, SourceSpan span1, SourceSpan span2, bool throwing) {
+    final messageWithPrefix = options.useColors
+        ? (color + prefix + _NO_COLOR + message) : (prefix + message);
+    var text = messageWithPrefix;
     if (span != null) {
-      text = span.toMessageString(message);
+      text = span.toMessageString(messageWithPrefix);
     }
     print(text);
     if (span1 != null) {
-      print(span1.toMessageString(message));
+      print(span1.toMessageString(messageWithPrefix));
     }
     if (span2 != null) {
-      print(span2.toMessageString(message));
+      print(span2.toMessageString(messageWithPrefix));
     }
 
     if (throwing) {
-      throw new CompilerException(message, span);
+      throw new CompilerException(messageWithPrefix, span);
     }
   }
 
   /** [message] is considered a static compile-time error by the Dart lang. */
-  void error(String message, [SourceSpan span, SourceSpan span1, SourceSpan span2]) {
+  void error(String message,
+      [SourceSpan span, SourceSpan span1, SourceSpan span2]) {
     errors++;
-    _message('error: $message', span, span1, span2, options.throwOnErrors);
+    _message(_RED_COLOR, 'error: ', message,
+        span, span1, span2, options.throwOnErrors);
   }
 
   /** [message] is considered a type warning by the Dart lang. */
-  void warning(String message, [SourceSpan span, SourceSpan span1, SourceSpan span2]) {
+  void warning(String message,
+      [SourceSpan span, SourceSpan span1, SourceSpan span2]) {
     if (options.warningsAsErrors) {
       error(message, span, span1, span2);
       return;
     }
     warnings++;
     if (options.showWarnings) {
-      _message('warning: $message', span, span1, span2, options.throwOnWarnings);
+      _message(_MAGENTA_COLOR, 'warning: ', message,
+          span, span1, span2, options.throwOnWarnings);
     }
   }
 
   /** [message] at [location] is so bad we can't generate runnable code. */
-  void fatal(String message, [SourceSpan span, SourceSpan span1, SourceSpan span2]) {
+  void fatal(String message,
+      [SourceSpan span, SourceSpan span1, SourceSpan span2]) {
     errors++;
     seenFatal = true;
-    _message('fatal: $message', span, span1, span2,
-     options.throwOnFatal || options.throwOnErrors);
+    _message(_RED_COLOR, 'fatal: ', message,
+        span, span1, span2, options.throwOnFatal || options.throwOnErrors);
   }
 
   /** [message] at [location] is about a bug in the compiler. */
-  void internalError(String message, [SourceSpan span, SourceSpan span1, SourceSpan span2]) {
-    _message('We are sorry, but... $message', span, span1, span2, true);
+  void internalError(String message,
+      [SourceSpan span, SourceSpan span1, SourceSpan span2]) {
+    _message(_NO_COLOR,
+        'We are sorry, but...', message, span, span1, span2, true);
   }
 
   /**
    * [message] at [location] will tell the user about what the compiler
    * is doing.
    */
-  void info(String message, [SourceSpan span, SourceSpan span1, SourceSpan span2]) {
+  void info(String message,
+      [SourceSpan span, SourceSpan span1, SourceSpan span2]) {
     if (options.showInfo) {
-      _message('info: $message', span, span1, span2, false);
+      _message(_GREEN_COLOR, 'info: ', message, span, span1, span2, false);
     }
   }
 
   /** Run [fn] without the forceDynamic option enabeld. */
   withoutForceDynamic(void fn()) {
     var oldForceDynamic = options.forceDynamic;
     options.forceDynamic = false;
 
     try {
       return fn();
@@ skipping 19 matching lines @@
 
   withTiming(String name, f()) {
     final sw = new Stopwatch();
     sw.start();
     var result = f();
     sw.stop();
     info('$name in ${sw.elapsedInMs()}msec');
     return result;
   }
 }