compact_log_formatter.h

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/*
 * Copyright 2022 MusicScience37 (Kenta Kabashima)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#pragma once
 
#include <cstddef>
#include <iterator>
#include <string_view>
 
#include <fmt/base.h>
#include <fmt/format.h>
 
#include "num_collect/logging/formatters/get_log_level_str_for_log.h"
#include "num_collect/logging/formatters/log_formatter_base.h"
#include "num_collect/logging/log_level.h"
#include "num_collect/logging/time_stamp.h"
#include "num_collect/util/source_info_view.h"
 
namespace num_collect::logging::formatters {
 
class compact_log_formatter : public log_formatter_base {
public:
    void format(fmt::memory_buffer& buffer, time_stamp time,
        std::string_view tag, log_level level, util::source_info_view source,
        std::string_view body) override {
        std::string_view filename = source.file_path();
        const std::size_t last_separator_pos = filename.find_last_of("/\\");
        if (last_separator_pos != std::string_view::npos) {
            filename = filename.substr(last_separator_pos + 1);
        }
 
        fmt::format_to(std::back_inserter(buffer),
            FMT_STRING("[{}] [{}] [{}] {} ({}:{}, {})"), time,
            get_output_log_level_str(level), tag, body, filename, source.line(),
            source.function_name());
    }
 
    compact_log_formatter() = default;
 
    ~compact_log_formatter() override = default;
 
    compact_log_formatter(const compact_log_formatter&) = delete;
    compact_log_formatter(compact_log_formatter&&) = delete;
    auto operator=(const compact_log_formatter&) = delete;
    auto operator=(compact_log_formatter&&) = delete;
};
 
}  // namespace num_collect::logging::formatters