Method ostream_proxy_prefix

library/Debug.cpp:111–167

}

DebugCategory::ostream_proxy_prefix::ostream_proxy_prefix(
        const DebugCategory& cat,
        color_ostream& target,
        const DebugCategory::level msgLevel) :
    color_ostream_proxy(target)
{
    DebugManager &dm = DebugManager::getInstance();
    const DebugManager::HeaderConfig &config = dm.getHeaderConfig();

    color(selectColor(msgLevel));

    bool has_header = false;
    if (config.timestamp) {
        has_header = true;
        auto now = std::chrono::system_clock::now();
        tm local{};
        //! \todo c++ 2020 will have std::chrono::to_stream(fmt, system_clock::now())
        //! but none implements it yet.
        std::time_t now_c = std::chrono::system_clock::to_time_t(now);
        // Output time in format %02H:%02M:%02S.%03ms
#if __GNUC__ < 5
        // Fallback for gcc 4
        char buffer[32];
        size_t sz = strftime(buffer, sizeof(buffer)/sizeof(buffer[0]),
                             "%T", localtime_r(&now_c, &local));
        *this << (sz > 0 ? buffer : "HH:MM:SS");
#else
        *this << std::put_time(localtime_r(&now_c, &local),"%T");
#endif
        if (config.timestamp_ms) {
            auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(
                    now.time_since_epoch()) % 1000;
            *this << '.' << std::setfill('0') << std::setw(3) << ms.count();
        }
        *this << ':';
    }
    if (config.thread_id) {
        has_header = true;
        // Thread id is allocated in the thread creation order to a thread_local
        // variable
        *this << 't' << thread_id << ':';
    }
    if (config.plugin) {
        has_header = true;
        *this << cat.plugin() << ':';
    }
    if (config.category) {
        has_header = true;
        *this << cat.category() << ':';
    }
    // It would be easy to pass __FILE__ and __LINE__ from the logging macros
    // and include that information as well, if we want to.

    if (has_header) {
        *this << ' ';
    }
}