log_level.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 <cstdint>
#include <string_view>
 
#include <fmt/base.h>
#include <fmt/format.h>  // IWYU pragma: keep
 
namespace num_collect::logging {
 
// clang-format off
enum class log_level : std::uint8_t {  // clang-format on
    trace,
 
    debug,
 
    iteration,
 
    iteration_label,
 
    summary,
 
    info,
 
    warning,
 
    error,
 
    critical,
 
    off
};
 
[[nodiscard]] inline auto get_log_level_str(log_level level) noexcept
    -> std::string_view {
    switch (level) {
    case log_level::trace:
        return "trace";
    case log_level::debug:
        return "debug";
    case log_level::iteration:
        return "iteration";
    case log_level::iteration_label:
        return "iteration_label";
    case log_level::summary:
        return "summary";
    case log_level::info:
        return "info";
    case log_level::warning:
        return "warning";
    case log_level::error:
        return "error";
    case log_level::critical:
        return "critical";
    case log_level::off:
        return "off";
    }
    return "unknown";
}
 
}  // namespace num_collect::logging
 
namespace fmt {
 
template <>
struct formatter<num_collect::logging::log_level>
    : public formatter<string_view> {
public:
    auto format(
        num_collect::logging::log_level val, format_context& context) const {
        return formatter<string_view>::format(
            num_collect::logging::get_log_level_str(val), context);
    }
};
 
}  // namespace fmt