Standalone Mojo Javascript application

mojo/apps/js/standalone_main.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/files/file_util.h"
+#include "base/i18n/icu_util.h"
+#include "mojo/application/application_runner_chromium.h"
+#include "mojo/apps/js/application_delegate_impl.h"
+#include "mojo/apps/js/js_app.h"
+#include "mojo/public/c/system/main.h"
+#include "mojo/public/cpp/application/application_delegate.h"
+
+namespace mojo {
+namespace apps {
+
+class StandaloneJSApp : public JSApp {
+ public:
+  StandaloneJSApp(ApplicationDelegateImpl* app_delegate_impl,
+                  const base::FilePath& path)
+      : JSApp(app_delegate_impl),
+        path_(path) {
+  }
+
+  virtual bool Load(std::string* source, std::string* file_name) override {
+    *file_name = path_.AsUTF8Unsafe();
+    return ReadFileToString(path_, source);
+  }
+
+ private:
+  base::FilePath path_;
+};
+
+class StandaloneApplicationDelegateImpl : public ApplicationDelegateImpl {
+ private:
+  virtual void Initialize(ApplicationImpl* app) override {
+    ApplicationDelegateImpl::Initialize(app);
+
+    // TODO(hansmuller): Find the JS source code path in app->args().
+    base::FilePath path(base::FilePath::FromUTF8Unsafe(

[Aaron Boodman, 2014/10/01 17:45:52]

I forgot to put this in the review, but the hardcoded path here is really weird,
and makes it impossible for anyone to use this other than you.

I realize you need command line support to make this work right. Are you working
on that, or is someone else?

I think it would be better for now to use base::PathService to find main.js in
the source tree. At least it would work for all developers then.

+        "/builds/dev/src/mojo/apps/js/main.js"));
+
+    scoped_ptr<JSApp> js_app(new StandaloneJSApp(this, path));
+    StartJSApp(js_app.Pass());
+  }
+};
+
+}  // namespace apps
+}  // namespace mojo
+
+MojoResult MojoMain(MojoHandle shell_handle) {
+  base::i18n::InitializeICU();
+  mojo::ApplicationRunnerChromium runner(
+      new mojo::apps::StandaloneApplicationDelegateImpl());
+  return runner.Run(shell_handle);
+}