Add getter for hasTerminal, terminalColumns and terminalLines on stdout.

runtime/bin/stdio_patch.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.
 
 patch class _StdIOUtils {
   static Stdin _getStdioInputStream() {
     switch (_getStdioHandleType(0)) {
       case _STDIO_HANDLE_TYPE_TERMINAL:
       case _STDIO_HANDLE_TYPE_PIPE:
       case _STDIO_HANDLE_TYPE_SOCKET:
         return new Stdin._(new _Socket._readPipe(0));
       case _STDIO_HANDLE_TYPE_FILE:
         return new Stdin._(new _FileStream.forStdin());
       default:
         throw new FileSystemException("Unsupported stdin type");
     }
   }
 
-  static IOSink _getStdioOutputStream(int fd) {
+  static _getStdioOutputStream(int fd) {
+    wrap(sink) {
+      if (fd == 1) {
+        return new Stdout._(sink);
+      } else {
+        return new _StdSink(sink);
+      }
+    }
     assert(fd == 1 || fd == 2);
     switch (_getStdioHandleType(fd)) {
       case _STDIO_HANDLE_TYPE_TERMINAL:
       case _STDIO_HANDLE_TYPE_PIPE:
       case _STDIO_HANDLE_TYPE_SOCKET:
-        return new _StdSink(new _Socket._writePipe(fd));
+        return wrap(new _Socket._writePipe(fd));
       case _STDIO_HANDLE_TYPE_FILE:
-        return new _StdSink(new IOSink(new _FileStreamConsumer.fromStdio(fd)));
+        return wrap(new IOSink(new _FileStreamConsumer.fromStdio(fd)));
       default:
         throw new FileSystemException("Unsupported stdin type");
     }
   }
 
   static int _socketType(nativeSocket) {
     var result = _getSocketType(nativeSocket);
     if (result is OSError) {
       throw new FileSystemException("Error retreiving socket type", result);
     }
     return result;
   }
 }
 
 patch class Stdin {
   /* patch */ int readByteSync() native "Stdin_ReadByte";
 
   /* patch */ bool get echoMode => _echoMode;
   /* patch */ void set echoMode(bool enabled) { _echoMode = enabled; }
 
   /* patch */ bool get lineMode => _lineMode;
   /* patch */ void set lineMode(bool enabled) { _lineMode = enabled; }
 
   static bool get _echoMode native "Stdin_GetEchoMode";
   static void set _echoMode(bool enabled) native "Stdin_SetEchoMode";
   static bool get _lineMode native "Stdin_GetLineMode";
   static void set _lineMode(bool enabled) native "Stdin_SetLineMode";
 }
 
+patch class Stdout {
+  /* patch */ bool get hasTerminal {
+    try {
+      _terminalSize;
+      return true;
+    } catch (_) {
+      return false;
+    }
+  }
+
+  /* patch */ int get terminalColumns => _terminalSize[0];
+  /* patch */ int get terminalLines => _terminalSize[1];
+
+  static List get _terminalSize {
+    var size = _getTerminalSize();
+    if (size is! List) {
+      throw new StdoutException("Could not get terminal size", size);
+    }
+    return size;
+  }
+
+  static List _getTerminalSize() native "Stdout_GetTerminalSize";
+}
+
 
 _getStdioHandle(_NativeSocket socket, int num) native "Socket_GetStdioHandle";
 _getStdioHandleType(int num) native "File_GetStdioHandleType";
 _getSocketType(_NativeSocket nativeSocket) native "Socket_GetType";