An option to enable 'print' to send output to the console.

pkg/analysis_server/lib/driver.dart

 // Copyright (c) 2014, 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 driver;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:analysis_server/http_server.dart';
@@ skipping 33 matching lines @@
   static const String HELP_OPTION = "help";
 
   /**
    * The name of the option used to specify the log file to which
    * instrumentation data is to be written.
    */
   static const String INSTRUMENTATION_LOG_FILE_OPTION =
       "instrumentation-log-file";
 
   /**
+   * The name of the option used to specify if [print] should print to the
+   * console instead of being intercepted.
+   */
+  static const String INTERNAL_PRINT_TO_CONSOLE =
+      "internal-print-to-console";
+
+  /**
    * The name of the option used to specify the port to which the server will
    * connect.
    */
   static const String PORT_OPTION = "port";
 
   /**
    * The path to the SDK.
    * TODO(paulberry): get rid of this once the 'analysis.updateSdks' request is
    * operational.
    */
@@ skipping 27 matching lines @@
         defaultsTo: false,
         negatable: false);
     parser.addFlag(
         HELP_OPTION,
         help: "print this help message without starting a server",
         defaultsTo: false,
         negatable: false);
     parser.addOption(
         INSTRUMENTATION_LOG_FILE_OPTION,
         help: "[path] the file to which instrumentation data will be logged");
+    parser.addFlag(
+        INTERNAL_PRINT_TO_CONSOLE,
+        help: "enable sending `print` output to the console",
+        defaultsTo: false,
+        negatable: false);
     parser.addOption(
         PORT_OPTION,
         help: "[port] the port on which the server will listen");
     parser.addOption(SDK_OPTION, help: "[path] the path to the sdk");
     parser.addFlag(
         NO_ERROR_NOTIFICATION,
         help:
             "disable sending all analysis error notifications to the server (not yet implemented)",
         defaultsTo: false,
         negatable: false);
@@ skipping 41 matching lines @@
       defaultSdk = DirectoryBasedDartSdk.defaultSdk;
     }
 
     socketServer = new SocketServer(analysisServerOptions, defaultSdk);
     httpServer = new HttpAnalysisServer(socketServer);
     stdioServer = new StdioAnalysisServer(socketServer);
 
     if (serve_http) {
       httpServer.serveHttp(port);
     }
-    _capturePrints(() {
+
+    if (results[INTERNAL_PRINT_TO_CONSOLE]) {
       stdioServer.serveStdio().then((_) {
         if (serve_http) {
           httpServer.close();
         }
         exit(0);
       });
-    }, httpServer.recordPrint);
+    } else {
+      _capturePrints(() {
+        stdioServer.serveStdio().then((_) {
+          if (serve_http) {
+            httpServer.close();
+          }
+          exit(0);
+        });
+      }, httpServer.recordPrint);
+    }
   }
 
   /**
    * Execute [callback], capturing any data it prints out and redirecting it to
    * the function [printHandler].
    */
   dynamic _capturePrints(dynamic callback(), void printHandler(String line)) {
     ZoneSpecification zoneSpecification = new ZoneSpecification(
         print: (Zone self, ZoneDelegate parent, Zone zone, String line) {
       printHandler(line);
       // Note: we don't pass the line on to stdout, because that is reserved
       // for communication to the client.
     });
     return runZoned(callback, zoneSpecification: zoneSpecification);
   }
 
   /**
    * Print information about how to use the server.
    */
   void _printUsage(ArgParser parser) {
     print('Usage: $BINARY_NAME [flags]');
     print('');
     print('Supported flags are:');
     print(parser.usage);
   }
 }