text: /*
   *          Copyright Andrey Semashev 2007 - 2015.
   * Distributed under the Boost Software License, Version 1.0.
   *    (See accompanying file LICENSE_1_0.txt or copy at
   *          http://www.boost.org/LICENSE_1_0.txt)
   */
  /*!
   * \file   file.hpp
   * \author Andrey Semashev
   * \date   16.05.2008
   *
   * The header contains implementation of convenience functions for enabling logging to a file.
   */
  
  #ifndef BOOST_LOG_UTILITY_SETUP_FILE_HPP_INCLUDED_
  #define BOOST_LOG_UTILITY_SETUP_FILE_HPP_INCLUDED_
  
  #include <boost/smart_ptr/shared_ptr.hpp>
  #include <boost/smart_ptr/make_shared_object.hpp>
  #include <boost/parameter/parameters.hpp> // for is_named_argument
  #include <boost/preprocessor/comparison/greater.hpp>
  #include <boost/preprocessor/punctuation/comma_if.hpp>
  #include <boost/preprocessor/repetition/enum_params.hpp>
  #include <boost/preprocessor/repetition/enum_binary_params.hpp>
  #include <boost/preprocessor/repetition/enum_shifted_params.hpp>
  #include <boost/preprocessor/repetition/repeat_from_to.hpp>
  #include <boost/log/detail/config.hpp>
  #include <boost/log/detail/sink_init_helpers.hpp>
  #include <boost/log/detail/parameter_tools.hpp>
  #include <boost/log/core/core.hpp>
  #ifndef BOOST_LOG_NO_THREADS
  #include <boost/log/sinks/sync_frontend.hpp>
  #else
  #include <boost/log/sinks/unlocked_frontend.hpp>
  #endif
  #include <boost/log/sinks/text_file_backend.hpp>
  #include <boost/log/keywords/scan_method.hpp>
  #include <boost/log/detail/header.hpp>
  
  #ifdef BOOST_HAS_PRAGMA_ONCE
  #pragma once
  #endif
  
  #ifndef BOOST_LOG_DOXYGEN_PASS
  #ifndef BOOST_LOG_NO_THREADS
  #define BOOST_LOG_FILE_SINK_FRONTEND_INTERNAL sinks::synchronous_sink
  #else
  #define BOOST_LOG_FILE_SINK_FRONTEND_INTERNAL sinks::unlocked_sink
  #endif
  #endif // BOOST_LOG_DOXYGEN_PASS
  
  namespace boost {
  
  BOOST_LOG_OPEN_NAMESPACE
  
  namespace aux {
  
  //! The function creates a file collector according to the specified arguments
  template< typename ArgsT >
  inline shared_ptr< sinks::file::collector > setup_file_collector(ArgsT const&, mpl::true_ const&)
  {
      return shared_ptr< sinks::file::collector >();
  }
  template< typename ArgsT >
  inline shared_ptr< sinks::file::collector > setup_file_collector(ArgsT const& args, mpl::false_ const&)
  {
      return sinks::file::make_collector(args);
  }
  
  //! The function constructs the sink and adds it to the core
  template< typename ArgsT >
  shared_ptr< BOOST_LOG_FILE_SINK_FRONTEND_INTERNAL< sinks::text_file_backend > > add_file_log(ArgsT const& args)
  {
      typedef sinks::text_file_backend backend_t;
      shared_ptr< backend_t > pBackend = boost::make_shared< backend_t >(args);
  
      shared_ptr< sinks::file::collector > pCollector = aux::setup_file_collector(args,
          typename is_void< typename parameter::binding< ArgsT, keywords::tag::target, void >::type >::type());
      if (pCollector)
      {
          pBackend->set_file_collector(pCollector);
          pBackend->scan_for_files(args[keywords::scan_method | sinks::file::scan_matching]);
      }
  
      shared_ptr< BOOST_LOG_FILE_SINK_FRONTEND_INTERNAL< backend_t > > pSink =
          boost::make_shared< BOOST_LOG_FILE_SINK_FRONTEND_INTERNAL< backend_t > >(pBackend);
  
      aux::setup_filter(*pSink, args,
          typename is_void< typename parameter::binding< ArgsT, keywords::tag::filter, void >::type >::type());
  
      aux::setup_formatter(*pSink, args,
          typename is_void< typename parameter::binding< ArgsT, keywords::tag::format, void >::type >::type());
  
      core::get()->add_sink(pSink);
  
      return pSink;
  }
  
  //! The function wraps the argument into a file_name named argument, if needed
  template< typename T >
  inline T const& wrap_file_name(T const& arg, mpl::true_)
  {
      return arg;
  }
  template< typename T >
  inline typename parameter::aux::tag< keywords::tag::file_name, T const >::type
  wrap_file_name(T const& arg, mpl::false_)
  {
      return keywords::file_name = arg;
  }
  
  } // namespace aux
  
  #ifndef BOOST_LOG_DOXYGEN_PASS
  
  #define BOOST_LOG_INIT_LOG_TO_FILE_INTERNAL(z, n, data)\
      template< BOOST_PP_ENUM_PARAMS(n, typename T) >\
      inline shared_ptr< BOOST_LOG_FILE_SINK_FRONTEND_INTERNAL< sinks::text_file_backend > > add_file_log(BOOST_PP_ENUM_BINARY_PARAMS(n, T, const& arg))\
      {\
          return aux::add_file_log((\
              aux::wrap_file_name(arg0, typename parameter::aux::is_named_argument< T0 >::type())\
              BOOST_PP_COMMA_IF(BOOST_PP_GREATER(n, 1))\
              BOOST_PP_ENUM_SHIFTED_PARAMS(n, arg)\
              ));\
      }
  
  BOOST_PP_REPEAT_FROM_TO(1, BOOST_LOG_MAX_PARAMETER_ARGS, BOOST_LOG_INIT_LOG_TO_FILE_INTERNAL, ~)
  
  #undef BOOST_LOG_INIT_LOG_TO_FILE_INTERNAL
  
  #else // BOOST_LOG_DOXYGEN_PASS
  
  /*!
   * The function initializes the logging library to write logs to a file stream.
   *
   * \param args A number of named arguments. The following parameters are supported:
   *             \li \c file_name The file name or its pattern. This parameter is mandatory.
   *             \li \c open_mode The mask that describes the open mode for the file. See <tt>std::ios_base::openmode</tt>.
   *             \li \c rotation_size The size of the file at which rotation should occur. See <tt>basic_text_file_backend</tt>.
   *             \li \c time_based_rotation The predicate for time-based file rotations. See <tt>basic_text_file_backend</tt>.
   *             \li \c auto_flush A boolean flag that shows whether the sink should automatically flush the file
   *                               after each written record.
   *             \li \c target The target directory to store rotated files in. See <tt>sinks::file::make_collector</tt>.
   *             \li \c max_size The maximum total size of rotated files in the target directory. See <tt>sinks::file::make_collector</tt>.
   *             \li \c min_free_space Minimum free space in the target directory. See <tt>sinks::file::make_collector</tt>.
   *             \li \c max_files The maximum total number of rotated files in the target directory. See <tt>sinks::file::make_collector</tt>.
   *             \li \c scan_method The method of scanning the target directory for log files. See <tt>sinks::file::scan_method</tt>.
   *             \li \c filter Specifies a filter to install into the sink. May be a string that represents a filter,
   *                           or a filter lambda expression.
   *             \li \c format Specifies a formatter to install into the sink. May be a string that represents a formatter,
   *                           or a formatter lambda expression (either streaming or Boost.Format-like notation).
   * \return Pointer to the constructed sink.
   */
  template< typename... ArgsT >
  shared_ptr< BOOST_LOG_FILE_SINK_FRONTEND_INTERNAL< sinks::text_file_backend > > add_file_log(ArgsT... const& args);
  
  #endif // BOOST_LOG_DOXYGEN_PASS
  
  BOOST_LOG_CLOSE_NAMESPACE // namespace log
  
  } // namespace boost
  
  #undef BOOST_LOG_FILE_SINK_FRONTEND_INTERNAL
  
  #include <boost/log/detail/footer.hpp>
  
  #endif // BOOST_LOG_UTILITY_SETUP_FILE_HPP_INCLUDED_
  