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Don't fail environmental check if README.md exists (but .txt and no-suffix don't)

/*
 *          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   sink_init_helpers.hpp
 * \author Andrey Semashev
 * \date   14.03.2009
 *
 * \brief  This header is the Boost.Log library implementation, see the library documentation
 *         at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
 */

#ifndef BOOST_LOG_DETAIL_SINK_INIT_HELPERS_HPP_INCLUDED_
#define BOOST_LOG_DETAIL_SINK_INIT_HELPERS_HPP_INCLUDED_

#include <string>
#include <boost/mpl/bool.hpp>
#include <boost/parameter/binding.hpp>
#include <boost/type_traits/is_void.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/phoenix/core/is_actor.hpp>
#include <boost/log/detail/config.hpp>
#include <boost/log/core/core.hpp>
#include <boost/log/expressions/filter.hpp>
#include <boost/log/expressions/formatter.hpp>
#include <boost/log/utility/setup/filter_parser.hpp>
#include <boost/log/utility/setup/formatter_parser.hpp>
#include <boost/log/keywords/filter.hpp>
#include <boost/log/keywords/format.hpp>
#include <boost/log/detail/header.hpp>

#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif

namespace boost {

BOOST_LOG_OPEN_NAMESPACE

namespace aux {

// The function creates a filter functional object from the provided argument
template< typename CharT >
inline filter acquire_filter(const CharT* filter)
{
    return boost::log::parse_filter(filter);
}
template< typename CharT, typename TraitsT, typename AllocatorT >
inline filter acquire_filter(std::basic_string< CharT, TraitsT, AllocatorT > const& filter)
{
    return boost::log::parse_filter(filter);
}
template< typename FilterT >
inline typename enable_if<
    phoenix::is_actor< FilterT >,
    FilterT const&
>::type acquire_filter(FilterT const& filter)
{
    return filter;
}

// The function installs filter into the sink, if provided in the arguments pack
template< typename SinkT, typename ArgsT >
inline void setup_filter(SinkT&, ArgsT const&, mpl::true_)
{
}

template< typename SinkT, typename ArgsT >
inline void setup_filter(SinkT& s, ArgsT const& args, mpl::false_)
{
    s.set_filter(aux::acquire_filter(args[keywords::filter]));
}


// The function creates a filter functional object from the provided argument
template< typename CharT >
inline basic_formatter< CharT > acquire_formatter(const CharT* formatter)
{
    return boost::log::parse_formatter(formatter);
}
template< typename CharT, typename TraitsT, typename AllocatorT >
inline basic_formatter< CharT > acquire_formatter(std::basic_string< CharT, TraitsT, AllocatorT > const& formatter)
{
    return boost::log::parse_formatter(formatter);
}
template< typename FormatterT >
inline typename enable_if<
    phoenix::is_actor< FormatterT >,
    FormatterT const&
>::type acquire_formatter(FormatterT const& formatter)
{
    return formatter;
}

// The function installs filter into the sink, if provided in the arguments pack
template< typename SinkT, typename ArgsT >
inline void setup_formatter(SinkT&, ArgsT const&, mpl::true_)
{
}

template< typename SinkT, typename ArgsT >
inline void setup_formatter(SinkT& s, ArgsT const& args, mpl::false_)
{
    s.set_formatter(aux::acquire_formatter(args[keywords::format]));
}

} // namespace aux

BOOST_LOG_CLOSE_NAMESPACE // namespace log

} // namespace boost

#include <boost/log/detail/footer.hpp>

#endif // BOOST_LOG_DETAIL_SINK_INIT_HELPERS_HPP_INCLUDED_