RedirectStd.h

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/*

             *
            ***
           *****
   *********************       Mercenaries Engineering SARL
     *****************              Copyright (C) 2024
       *************
         *********        http://www.mercenaries-engineering.com
        ***********
       ****     ****
      **           **

*/
#pragma once

#include "Maquina/Export.h"

MAQUINA_IGNORE_WARNINGS_BEGIN
#include <thread>
MAQUINA_IGNORE_WARNINGS_END

namespace pybind11
{
class object;
}

namespace maquina
{

class MAQUINA_EXPORT RedirectStd
{
public:
  enum class FileDescriptor
  {
    out,  
    err   
  };

  RedirectStd(
    FileDescriptor fd 
  );
  virtual ~RedirectStd() {}

  FileDescriptor file_descriptor() const
  {
    return _fd;
  }

  void restore();


  virtual void on_data(const gsl::span<char>& buffer) = 0;

private:

  int _pipe_read = -1;  // The READ pipe
  FileDescriptor _fd = FileDescriptor::out; // The original file descriptor
  int _original_fd = -1;         // The original file descriptor
  std::shared_ptr<pybind11::object> _python_stdxx = nullptr; // Original python sys.stdxxx
  std::thread _thread;  // The working thread dispatching the buffers
  FILE* _freopen = nullptr;
};

}