IndentedStream.h

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//                   OpenMS -- Open-Source Mass Spectrometry
// --------------------------------------------------------------------------
// Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
// ETH Zurich, and Freie Universitaet Berlin 2002-2022.
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// $Maintainer: Chris Bielow $
// $Authors: Chris Bielow $
// --------------------------------------------------------------------------

#include <OpenMS/APPLICATIONS/ConsoleUtils.h>

#include <sstream>

using namespace std;

namespace OpenMS
{
  class Colorizer;

  class OPENMS_DLLAPI IndentedStream
  {
  public:
    IndentedStream(std::ostream& stream, const UInt indentation, const UInt max_lines);

    ~IndentedStream();

    IndentedStream& operator<<(Colorizer& colorizer);
    
    IndentedStream& operator<<(IndentedStream& self);

    template<typename T>
    IndentedStream& operator<<(const T& data)
    {
      // convert data to string
      std::stringstream str_data;
      str_data << data;

      auto result = ConsoleUtils::breakStringList(str_data.str(), indentation_, max_lines_, current_column_pos_);
      if (result.empty())
      {
        return *this;
      }
      
      if (result.size() == 1)
      { // no new linebreak. advance our position
        current_column_pos_ += result.back().size();
      }
      else
      { // new line: this is our new position
        current_column_pos_ = result.back().size();
      }
      

      // push result into stream
      *stream_ << result[0];
      for (size_t i = 1; i < result.size(); ++i)
      {
        *stream_ << '\n';
        *stream_ << result[i];
      }      

      return *this;
    }
        
    typedef std::ostream& (*StreamManipulator)(std::ostream&);

    IndentedStream& operator<<(StreamManipulator manip);

    IndentedStream& indent(const UInt new_indent);

  private:
    std::ostream* stream_;        
    UInt indentation_;            
    UInt max_lines_;              
    UInt max_line_width_;         
    Size current_column_pos_ = 0; 
  };

} // namespace OpenMS