Function handler

src/service/debug.cpp:23–44

FILE *logFile{};

void handler(QtMsgType type, const QMessageLogContext &context,
             const QString &msg)
{
  const auto typeName = QMap<QtMsgType, QByteArray>{{QtDebugMsg, " DEBUG "},
                                                    {QtInfoMsg, " INFO "},
                                                    {QtWarningMsg, " WARN "},
                                                    {QtCriticalMsg, " CRIT "},
                                                    {QtFatalMsg, " FATAL "}}
                            .value(type);

  const auto message =
      QDateTime::currentDateTime().toString(Qt::ISODate).toUtf8() + ' ' +
      QByteArray::number(qintptr(QThread::currentThreadId())) + ' ' +
      QFileInfo(context.file).fileName().toUtf8() + ':' +
      QByteArray::number(context.line) + typeName + msg.toUtf8() + '\n';

  QMutexLocker locker(&mutex);
  if (logFile)
    write(fileno(logFile), message.data(), message.size());
  if (realStderr > 0)
    write(realStderr, message.data(), message.size());
}

void toDefaults()
{