Add exists, create and delete to directory implementation on Linux and Mac.

runtime/bin/directory.cc

Index: runtime/bin/directory.cc
diff --git a/runtime/bin/directory.cc b/runtime/bin/directory.cc
index d600f3df935d5fba08910b18008eceb2797c7328..6988b0ac212c4814c6e447ec73a638d5dcdd5a56 100644
--- a/runtime/bin/directory.cc
+++ b/runtime/bin/directory.cc
@@ -9,7 +9,6 @@
 
 static intptr_t GetHandlerPort(Dart_Handle handle) {
   if (Dart_IsNull(handle)) {
-    // TODO(ager): Generalize this to Directory::kInvalidId.
     return 0;
   }
   return DartUtils::GetIntegerInstanceField(handle, DartUtils::kIdFieldName);
@@ -34,3 +33,35 @@ void FUNCTION_NAME(Directory_List)(Dart_NativeArguments args) {
                   error_port);
   Dart_ExitScope();
 }
+
+
+void FUNCTION_NAME(Directory_Exists)(Dart_NativeArguments args) {
+  Dart_EnterScope();
+  Dart_Handle path = Dart_GetNativeArgument(args, 1);
+  ASSERT(Dart_IsString(path));
+  bool exists = false;
+  bool success = Directory::Exists(DartUtils::GetStringValue(path), &exists);

[Søren Gjesse, 2011/10/14 11:44:14]

How about returning an enum Yes/No/Don't know instead of two bools?

[Mads Ager (google), 2011/10/14 12:22:54]

Done.

+  int return_value = success ? (exists ? 1 : 0) : -1;
+  Dart_SetReturnValue(args, Dart_NewInteger(return_value));
+  Dart_ExitScope();
+}
+
+
+void FUNCTION_NAME(Directory_Create)(Dart_NativeArguments args) {
+  Dart_EnterScope();
+  Dart_Handle path = Dart_GetNativeArgument(args, 1);
+  ASSERT(Dart_IsString(path));
+  bool created = Directory::Create(DartUtils::GetStringValue(path));
+  Dart_SetReturnValue(args, Dart_NewBoolean(created));
+  Dart_ExitScope();
+}
+
+
+void FUNCTION_NAME(Directory_Delete)(Dart_NativeArguments args) {
+  Dart_EnterScope();
+  Dart_Handle path = Dart_GetNativeArgument(args, 1);
+  ASSERT(Dart_IsString(path));
+  bool deleted = Directory::Delete(DartUtils::GetStringValue(path));
+  Dart_SetReturnValue(args, Dart_NewBoolean(deleted));
+  Dart_ExitScope();
+}