text: ////////////////////////////////////////////////////////////////////////////////
  /// DISCLAIMER
  ///
  /// Copyright 2016 ArangoDB GmbH, Cologne, Germany
  ///
  /// Licensed under the Apache License, Version 2.0 (the "License");
  /// you may not use this file except in compliance with the License.
  /// You may obtain a copy of the License at
  ///
  ///     http://www.apache.org/licenses/LICENSE-2.0
  ///
  /// Unless required by applicable law or agreed to in writing, software
  /// distributed under the License is distributed on an "AS IS" BASIS,
  /// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  /// See the License for the specific language governing permissions and
  /// limitations under the License.
  ///
  /// Copyright holder is ArangoDB GmbH, Cologne, Germany
  ///
  /// @author Dr. Frank Celler
  ////////////////////////////////////////////////////////////////////////////////
  
  #ifndef ARANGODB_SHELL_V8SHELL_FEATURE_H
  #define ARANGODB_SHELL_V8SHELL_FEATURE_H 1
  
  #include "ApplicationFeatures/ApplicationFeature.h"
  
  #include <v8.h>
  #include <libplatform/libplatform.h>
  
  #include "Shell/ConsoleFeature.h"
  #include "Shell/ShellFeature.h"
  
  namespace arangodb {
  
  class ConsoleFeature;
  class V8ClientConnection;
  
  class V8ShellFeature final : public application_features::ApplicationFeature {
   public:
    V8ShellFeature(
      application_features::ApplicationServer& server,
      std::string const& name
    );
  
    void collectOptions(std::shared_ptr<options::ProgramOptions>) override;
    void validateOptions(
        std::shared_ptr<options::ProgramOptions> options) override;
    void start() override final;
    void unprepare() override final;
    void stop() override final;
  
    std::string const& startupDirectory() {
      return _startupDirectory;
    }
  
   private:
    std::string _startupDirectory;
    std::string _clientModule;
    std::string _copyDirectory;
    std::vector<std::string> _moduleDirectory;
    bool _currentModuleDirectory;
    bool _copyInstallation;
    bool _removeCopyInstallation;
    uint64_t _gcInterval;
  
   public:
    int runShell(std::vector<std::string> const&);
    bool runScript(std::vector<std::string> const& files,
                   std::vector<std::string> const&, bool);
    bool runString(std::vector<std::string> const& files,
                   std::vector<std::string> const&);
    bool runUnitTests(std::vector<std::string> const& files,
                      std::vector<std::string> const& positionals,
                      std::string const& testFilter);
    bool jslint(std::vector<std::string> const& files);
  
   private:
    void copyInstallationFiles();
    bool printHello(V8ClientConnection*);
    void initGlobals();
    void initMode(ShellFeature::RunMode, std::vector<std::string> const&);
    void loadModules(ShellFeature::RunMode);
    std::shared_ptr<V8ClientConnection> setup(v8::Local<v8::Context>& context, bool,
                                              std::vector<std::string> const&,
                                              bool* promptError = nullptr);
  
    std::string _name;
    v8::Isolate* _isolate;
    v8::Persistent<v8::Context> _context;
    ConsoleFeature* _console;
  };
  
  }
  
  #endif
  