CustomDefaultLogger.cpp

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// This file is part of the Acts project.
//
// Copyright (C) 2017-2018 CERN for the benefit of the Acts project
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#include "Acts/Utilities/Logger.hpp"

#include <algorithm>

namespace Acts {

namespace Logging {

class MirrorOutputDecorator final : public OutputDecorator {
 public:
  MirrorOutputDecorator(std::unique_ptr<OutputPrintPolicy> wrappee,
                        unsigned int maxWidth = 180)
      : OutputDecorator(std::move(wrappee)), m_maxWidth(maxWidth) {}

  void flush(const Level& lvl, const std::ostringstream& input) override {
    std::ostringstream os;
    std::string text = input.str();
    std::reverse(text.begin(), text.end());
    os << std::right << std::setw(m_maxWidth) << text;
    OutputDecorator::flush(lvl, os);
  }

 private:
  unsigned int m_maxWidth;
};

}  // namespace Logging

std::unique_ptr<const Logger> getDefaultLogger(const std::string& name,
                                               const Logging::Level& lvl,
                                               std::ostream* log_stream) {
  using namespace Logging;
  auto output = std::make_unique<LevelOutputDecorator>(
      std::make_unique<NamedOutputDecorator>(
          std::make_unique<TimedOutputDecorator>(
              std::make_unique<MirrorOutputDecorator>(
                  std::make_unique<DefaultPrintPolicy>(log_stream))),
          name));
  auto print = std::make_unique<DefaultFilterPolicy>(lvl);
  return std::make_unique<const Logger>(std::move(output), std::move(print));
}

}  // namespace Acts