Move markdown library.

utils/markdown/markdown.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.
-
-/// Standalone script for parsing markdown from files and converting to HTML.
-#library('markdown_app');
-
-#import('lib.dart');
-
-main() {
-  final args = (new Options()).arguments;
-
-  if (args.length > 2) {
-    print('Usage:');
-    print('  dart markdown.dart <inputfile> [<outputfile>]');
-    print('');
-    print('Reads a file containing markdown and converts it to HTML.');
-    print('If <outputfile> is omitted, prints to stdout.');
-    return;
-  }
-
-  final source = readFile(args[0]);
-  final html = markdownToHtml(source);
-
-  if (args.length == 1) {
-    print(html);
-  } else {
-    writeFile(args[1], html);
-  }
-}
-
-String readFile(String path) {
-  final file = (new File(path)).openSync();
-  final length = file.lengthSync();
-  final buffer = new List<int>(length);
-  final bytes = file.readListSync(buffer, 0, length);
-  file.closeSync();
-  return new String.fromCharCodes(buffer);
-}
-
-void writeFile(String path, String text) {
-  final file = new File(path);
-  final stream = file.openOutputStream();
-  stream.write(text.charCodes());
-  stream.close();
-}