Introduce gin_shell

gin/shell/gin_main.cc

+// Copyright 2013 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/at_exit.h"
+#include "base/bind.h"
+#include "base/command_line.h"
+#include "base/file_util.h"
+#include "base/message_loop/message_loop.h"
+#include "gin/initialize.h"
+#include "gin/modules/module_runner_delegate.h"
+#include "gin/test/file_runner.h"
+#include "gin/try_catch.h"
+
+namespace gin {
+namespace {
+
+std::string Load(const base::FilePath& path) {
+  std::string source;
+  if (!ReadFileToString(path, &source))
+    LOG(FATAL) << "Unable to read " << path.LossyDisplayName();
+  return source;
+}
+
+void Run(base::WeakPtr<Runner> runner, const std::string& source) {
+  if (!runner)
+    return;
+  Runner::Scope scope(runner.get());
+  runner->Run(source);
+}
+
+base::FilePath GetModuleBase() {
+  base::FilePath module_base;
+  CHECK(file_util::GetCurrentDirectory(&module_base));
+  return module_base;
+}
+
+class ShellRunnerDelegate : public ModuleRunnerDelegate {
+ public:
+  ShellRunnerDelegate() : ModuleRunnerDelegate(GetModuleBase()) {}
+
+  virtual void UnhandledException(Runner* runner,
+                                  TryCatch& try_catch) OVERRIDE {
+    ModuleRunnerDelegate::UnhandledException(runner, try_catch);
+    LOG(ERROR) << try_catch.GetPrettyMessage();
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ShellRunnerDelegate);
+};
+
+}  // namespace
+}  // namespace gin
+
+int main(int argc, char** argv) {
+  base::AtExitManager at_exit;
+  CommandLine::Init(argc, argv);
+  gin::Initialize();
+
+  base::MessageLoop message_loop;
+
+  gin::ShellRunnerDelegate delegate;
+  gin::Runner runner(&delegate, v8::Isolate::GetCurrent());
+
+  CommandLine::StringVector args = CommandLine::ForCurrentProcess()->GetArgs();
+  for (CommandLine::StringVector::const_iterator it = args.begin();
+       it != args.end(); ++it) {
+    base::MessageLoop::current()->PostTask(FROM_HERE, base::Bind(
+        gin::Run, runner.GetWeakPtr(), gin::Load(base::FilePath(*it))));
+  }
+
+  message_loop.RunUntilIdle();
+  return 0;
+}