Added function getMeshReader

/***************************************************************************

                          getMeshReader.h  -  description

                             -------------------

    begin                : Nov 7, 2020

    copyright            : (C) 2020 by Tomas Oberhuber et al.

    email                : tomas.oberhuber@fjfi.cvut.cz

 ***************************************************************************/

/* See Copyright Notice in tnl/Copyright */

// Implemented by: Jakub Klinkovský

#pragma once

#include <experimental/filesystem>

#include <TNL/Meshes/Readers/NetgenReader.h>

#include <TNL/Meshes/Readers/VTKReader.h>

#include <TNL/Meshes/Readers/VTUReader.h>

#include <TNL/Meshes/Readers/PVTUReader.h>

namespace TNL {

namespace Meshes {

namespace Readers {

std::shared_ptr< Readers::MeshReader >

getMeshReader( const std::string& fileName,

               const std::string& fileFormat )

{

   namespace fs = std::experimental::filesystem;

   std::string format = fileFormat;

   if( format == "auto" ) {

      format = fs::path(fileName).extension();

      if( format.length() > 0 )

         // remove dot from the extension

         format = format.substr(1);

   }

   if( format == "ng" )

      return std::make_shared< Readers::NetgenReader >( fileName );

   else if( format == "vtk" )

      return std::make_shared< Readers::VTKReader >( fileName );

   else if( format == "vtu" )

      return std::make_shared< Readers::VTUReader >( fileName );

   else if( format == "pvtu" )

      return std::make_shared< Readers::PVTUReader >( fileName );

   if( fileFormat == "auto" )

      std::cerr << "File '" << fileName << "' has unsupported format (based on the file extension): " << format << ".";

   else

      std::cerr << "Unsupported fileFormat parameter: " << fileFormat << ".";

   std::cerr << " Supported formats are 'vtk', 'vtu', 'pvtu' and 'ng'." << std::endl;

   return nullptr;

}

} // namespace Readers

} // namespace Meshes

} // namespace TNL