Add os.chdir and os.setenv to d8. Move system() to os.system().

src/d8.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 145 matching lines @@
     }
     v8::String::Utf8Value str(args[i]);
     const char* cstr = ToCString(str);
     printf("%s", cstr);
   }
   printf("\n");
   return Undefined();
 }
 
 
+Handle<Value> Shell::SetEnvironment(const Arguments& args) {
+  if (args.Length() != 2) {
+    const char* message = "setenv() takes two arguments";
+    return ThrowException(String::New(message));
+  }
+  String::Utf8Value var(args[0]);
+  String::Utf8Value value(args[1]);
+  if (*var == NULL) {
+    const char* message =
+        "os.setenv(): String conversion of variable name failed.";
+    return ThrowException(String::New(message));
+  }
+  if (*value == NULL) {
+    const char* message =
+        "os.setenv(): String conversion of variable contents failed.";
+    return ThrowException(String::New(message));
+  }
+  setenv(*var, *value, 1);
+  return v8::Undefined();
+}
+
+
 Handle<Value> Shell::Load(const Arguments& args) {
   for (int i = 0; i < args.Length(); i++) {
     HandleScope handle_scope;
     String::Utf8Value file(args[i]);
     if (*file == NULL) {
       return ThrowException(String::New("Error loading file"));
     }
     Handle<String> source = ReadFile(*file);
     if (source.IsEmpty()) {
       return ThrowException(String::New("Error loading file"));
@@ skipping 159 matching lines @@
     MapCounters(i::FLAG_map_counters);
   if (i::FLAG_dump_counters)
     V8::SetCounterFunction(LookupCounter);
   // Initialize the global objects
   HandleScope scope;
   Handle<ObjectTemplate> global_template = ObjectTemplate::New();
   global_template->Set(String::New("print"), FunctionTemplate::New(Print));
   global_template->Set(String::New("load"), FunctionTemplate::New(Load));
   global_template->Set(String::New("quit"), FunctionTemplate::New(Quit));
   global_template->Set(String::New("version"), FunctionTemplate::New(Version));
-  global_template->Set(String::New("system"), FunctionTemplate::New(System));
+
+  Handle<ObjectTemplate> os_templ = ObjectTemplate::New();
+  os_templ->Set(String::New("system"), FunctionTemplate::New(System));
+  os_templ->Set(String::New("chdir"), FunctionTemplate::New(ChangeDirectory));
+  os_templ->Set(String::New("setenv"), FunctionTemplate::New(SetEnvironment));
+  global_template->Set(String::New("os"), os_templ);
 
   utility_context_ = Context::New(NULL, global_template);
   utility_context_->SetSecurityToken(Undefined());
   Context::Scope utility_scope(utility_context_);
 
   i::JSArguments js_args = i::FLAG_js_arguments;
   i::Handle<i::FixedArray> arguments_array =
       i::Factory::NewFixedArray(js_args.argc());
   for (int j = 0; j < js_args.argc(); j++) {
     i::Handle<i::String> arg =
@@ skipping 309 matching lines @@
   return 0;
 }
 
 
 }  // namespace v8
 
 
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }