dart:io | Implement FileSystemEntity.typeSync on Windows, to identify symbolic links and junctions.

tests/standalone/io/windows_file_system_links_test.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.
+
+import "dart:io";
+import "dart:isolate";
+
+createJunction(String dst, String link, void callback()) {
+  Process.run("cmd.exe", ["/c", "mklink /J $link $dst"]).then((result) {
+    if (result.exitCode == 0) {
+      callback();
+    } else {
+      throw new Exception('link creation failed');
+    }
+  });
+}
+
+
+testJunctionTypeDelete() {
+  var temp = new Directory('').createTempSync();
+  var x = '${temp.path}${Platform.pathSeparator}x';
+  var y = '${temp.path}${Platform.pathSeparator}y';
+
+  new Directory(x).createSync();
+  createJunction(x, y, () {
+    Expect.isTrue(new Directory(y).existsSync());
+    Expect.isTrue(new Directory(x).existsSync());
+    Expect.isTrue(FileSystemEntity.isLinkSync(y));
+    Expect.isFalse(FileSystemEntity.isLinkSync(x));
+    Expect.isTrue(FileSystemEntity.isDirectorySync(y));
+    Expect.isTrue(FileSystemEntity.isDirectorySync(x));
+    Expect.equals(FileSystemEntityType.DIRECTORY, FileSystemEntity.typeSync(y));
+    Expect.equals(FileSystemEntityType.DIRECTORY, FileSystemEntity.typeSync(x));
+    Expect.equals(FileSystemEntityType.LINK,
+                  FileSystemEntity.typeSync(y, followLinks: false));
+    Expect.equals(FileSystemEntityType.DIRECTORY,
+                  FileSystemEntity.typeSync(x, followLinks: false));
+
+    // Test Junction pointing to a missing directory.
+    new Directory(x).deleteSync();
+    Expect.isTrue(new Directory(y).existsSync());
+    Expect.isFalse(new Directory(x).existsSync());
+    Expect.isTrue(FileSystemEntity.isLinkSync(y));
+    Expect.isFalse(FileSystemEntity.isLinkSync(x));
+    Expect.isTrue(FileSystemEntity.isDirectorySync(y));
+    Expect.isFalse(FileSystemEntity.isDirectorySync(x));
+     Expect.equals(FileSystemEntityType.DIRECTORY, FileSystemEntity.typeSync(y));

[Søren Gjesse, 2013/03/08 09:38:50]

Long line (two more below).

+    Expect.equals(FileSystemEntityType.NOT_FOUND, FileSystemEntity.typeSync(x));
+    Expect.equals(FileSystemEntityType.LINK,
+                  FileSystemEntity.typeSync(y, followLinks: false));
+    Expect.equals(FileSystemEntityType.NOT_FOUND,
+                  FileSystemEntity.typeSync(x, followLinks: false));
+
+    // Delete Junction pointing to a missing directory.
+    new Directory(y).deleteSync();
+    Expect.isFalse(FileSystemEntity.isLinkSync(y));
+    Expect.equals(FileSystemEntityType.NOT_FOUND, FileSystemEntity.typeSync(y));
+
+    new Directory(x).createSync();
+    createJunction(x, y, () {
+      Expect.equals(FileSystemEntityType.LINK,
+                    FileSystemEntity.typeSync(y, followLinks: false));
+      Expect.equals(FileSystemEntityType.DIRECTORY,
+                    FileSystemEntity.typeSync(x, followLinks: false));
+
+      // Delete Junction pointing to an existing directory.
+      new Directory(y).deleteSync();
+      Expect.equals(FileSystemEntityType.NOT_FOUND, FileSystemEntity.typeSync(y));
+      Expect.equals(FileSystemEntityType.NOT_FOUND,
+                    FileSystemEntity.typeSync(y, followLinks: false));
+      Expect.equals(FileSystemEntityType.DIRECTORY, FileSystemEntity.typeSync(x));
+      Expect.equals(FileSystemEntityType.DIRECTORY,
+                    FileSystemEntity.typeSync(x, followLinks: false));
+      temp.deleteSync(recursive: true);
+    });
+  });
+}
+
+
+main() {
+  if (Platform.operatingSystem == 'windows') {
+    testJunctionTypeDelete();
+  }
+}