Add logging to file

AdaptiveBrightness/log_to_file.hpp

@@ -0,0 +1,58 @@
+#pragma once
+
+#include <QDateTime>
+#include <QFile>
+#include <QMessageLogger>
+#include <QString>
+#include <QTextStream>
+
+void logToFile(QtMsgType msgType, const QMessageLogContext& msgContext, const QString& msg)
+{
+    constexpr auto LOG_FILE = "logfile.log";
+
+    const auto dateTime = QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss.zzz");
+    QString formattedMsg = QString("[%1] ").arg(dateTime);
+
+    switch(msgType) {
+    case QtDebugMsg:
+        formattedMsg += "[Debug] ";
+        break;
+    case QtWarningMsg:
+        formattedMsg += "[Warning] ";
+        break;
+    case QtCriticalMsg:
+        formattedMsg += "[Critical] ";
+        break;
+    case QtFatalMsg:
+        formattedMsg += "[Fatal] ";
+        break;
+    case QtInfoMsg:
+        formattedMsg += "[Info] ";
+        break;
+    }
+
+    const auto msgFromFile = QString(msgContext.file);
+    const auto msgFromLine = (msgContext.line == 0) ? QString("") : QString("%1").arg(msgContext.line);
+    const auto msgFromFunction = QString(msgContext.function);
+
+    if(!msgFromFile.isEmpty() && !msgFromLine.isEmpty()) {
+        formattedMsg += QString("[%1:%2] ").arg(msgContext.file).arg(msgContext.line);
+    }
+    if(!msgFromFunction.isEmpty()) {
+        formattedMsg += QString("[%1] ").arg(msgContext.function);
+    }
+
+    formattedMsg += QString("%1").arg(msg);
+
+    QFile logFile(LOG_FILE);
+    logFile.open(QIODevice::WriteOnly | QIODevice::Append);
+
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+    constexpr auto qtEndl = Qt::endl;
+#else
+    constexpr auto qtEndl = ::endl;
+#endif
+
+    QTextStream textStream(&logFile);
+    textStream << formattedMsg << qtEndl;
+}

AdaptiveBrightness/main.cpp

@@ -1,9 +1,15 @@
 #include <QApplication>
+#include <QMessageLogger>
+#include <QtDebug>
+#include <QtGlobal>
 
 #include "AdaptiveBrightness.hpp"
+#include "log_to_file.hpp"
 
 int main(int argc, char* argv[])
 {
+    qInstallMessageHandler(logToFile);
+
     QApplication application(argc, argv);
     AdaptiveBrightness mainWindow;
     mainWindow.show();