stream.h

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/*
 * Copyright (c) 2003-2025, John Wiegley.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * - Neither the name of New Artisans LLC nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


#pragma once
 
#include "utils.h"
 
namespace ledger {

class output_stream_t
{
  output_stream_t& operator=(const output_stream_t&);
 
private:
  int pipe_to_pager_fd;
 
public:
  std::ostream * os;

  output_stream_t() : pipe_to_pager_fd(-1), os(&std::cout) {
    TRACE_CTOR(output_stream_t, "");
  }

  output_stream_t(const output_stream_t&)
    : pipe_to_pager_fd(-1), os(&std::cout) {
    TRACE_CTOR(output_stream_t, "copy");
  }

  ~output_stream_t() {
    TRACE_DTOR(output_stream_t);
    close();
  }

  void initialize(const optional<path>& output_file = none,
                  const optional<path>& pager_path  = none);

  operator std::ostream&() {
    return *os;
  }

  void flush() {
    os->flush();
  }

  void close();
};
 
} // namespace ledger