Add echo and line modes to Stdin.

sdk/lib/io/stdio.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.
 
 part of dart.io;
 
 const int _STDIO_HANDLE_TYPE_TERMINAL = 0;
 const int _STDIO_HANDLE_TYPE_PIPE = 1;
 const int _STDIO_HANDLE_TYPE_FILE = 2;
 const int _STDIO_HANDLE_TYPE_SOCKET = 3;
@@ skipping 24 matching lines @@
   Function close;
   _StdinEventSink(this.add, this.addError, this.close);
 }
 
 /**
  * [Stdin] allows both synchronous and asynchronous reads from the standard
  * input stream.
  *
  * Mixing synchronous and asynchronous reads is undefined.
  */
-class Stdin extends _StdStream {
+class Stdin extends _StdStream implements Stream<List<int>> {
   Stdin._(Stream<List<int>> stream) : super(stream);
 
   /**
    * Synchronously read a line from stdin. This call will block until a full
    * line is available. The line will contain the newline character(s).
    *
    * If end-of-file is reached, `null` is returned.
    *
    * If end-of-file is reached after some data has already been read, that data
    * is returned.
@@ skipping 35 matching lines @@
         decoder.handleDone(sink);
         break;
       }
     }
 
     if (empty) return null;
     return line.toString();
   }
 
   /**
+   * Enable or disable echo mode on the [Stdin].
+   *
+   * If disabled, input from to console will not be echoed.
+   *
+   * Default depends on the parent process, but usually enabled.
+   */
+  external void set echoMode(bool enabled);
+
+  /**
+   * Enable or disable line mode on the [Stdin].
+   *
+   * If enabled, characters are delayed until a new-line character is entered.
+   * If disabled, characters will be available as typed.
+   *
+   * Default depends on the parent process, but usually enabled.
+   */
+  external void set lineMOde(bool enabled);
+
+  /**
    * Synchronously read a byte from stdin. This call will block until a byte is
    * available.
    *
    * If at end of file, -1 is returned.
    */
   external int readByteSync();
 }
 
 
 class _StdSink implements IOSink {
@@ skipping 83 matching lines @@
   }
   return StdioType.OTHER;
 }
 
 
 class _StdIOUtils {
   external static IOSink _getStdioOutputStream(int fd);
   external static Stdin _getStdioInputStream();
   external static int _socketType(nativeSocket);
 }