time_stamp.h

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/*
 * Copyright 2023 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 <cstdint>
#include <ctime>
 
#include <fmt/base.h>
#include <fmt/chrono.h>
#include <fmt/format.h>
 
#include "num_collect/impl/num_collect_export.h"
 
namespace num_collect::logging {
 
class NUM_COLLECT_EXPORT time_stamp {
public:
    time_stamp(std::time_t seconds, std::uint32_t nanoseconds) noexcept;
 
    [[nodiscard]] auto seconds() const noexcept -> std::time_t;
 
    [[nodiscard]] auto nanoseconds() const noexcept -> std::uint32_t;
 
    [[nodiscard]] static auto now() noexcept -> time_stamp;
 
private:
    std::time_t seconds_;
 
    std::uint32_t nanoseconds_;
};
 
}  // namespace num_collect::logging
 
namespace fmt {
 
template <>
struct formatter<num_collect::logging::time_stamp> {
public:
    constexpr auto parse(format_parse_context& context)  // NOLINT
        -> decltype(context.begin()) {
        return context.end();
    }
 
    auto format(  // NOLINT
        num_collect::logging::time_stamp val, format_context& context) const {
        const auto time_tm = fmt::gmtime(val.seconds());
        return fmt::format_to(context.out(), FMT_STRING("{0:%FT%T}.{1:09d}"),
            time_tm, val.nanoseconds());
    }
};
 
}  // namespace fmt