First implementation

Logger.cpp

@@ -0,0 +1,73 @@
+#include "Logger.h"
+
+#include <QDir>
+#include <QFile>
+#include <QFileInfo>
+#include <QTextStream>
+
+namespace
+{
+constexpr int logFileSize = 5 * 1024 * 1024;
+const int logFileCount = 10;
+QFile logFile;
+
+QString logFileName()
+{
+	QList<QFileInfo> fileInfos;
+	for (int i = 0; i < logFileCount; ++i)
+	{
+		const auto fileName = QString("logs/log_%1.txt").arg(i);
+		const QFileInfo info(fileName);
+		if (!info.exists())
+		{
+			return fileName;
+		}
+
+		fileInfos.append(info);
+	}
+
+	QFile::remove(fileInfos.first().filePath());
+	for (int i = 0; i < logFileCount - 1; ++i)
+	{
+		QFile::rename(fileInfos[i + 1].filePath(), fileInfos[i].filePath());
+	}
+
+	return fileInfos.last().filePath();
+}
+
+void checkLogFile()
+{
+	if (!logFile.isOpen())
+	{
+		if (!QFile::exists("logs"))
+		{
+			QDir().mkdir("logs");
+		}
+
+		logFile.setFileName(logFileName());
+		logFile.open(QIODevice::WriteOnly);
+	}
+	else if (logFile.size() > logFileSize)
+	{
+		logFile.close();
+		logFile.setFileName(logFileName());
+		logFile.open(QIODevice::WriteOnly);
+	}
+}
+}
+
+QString logMessagePattern()
+{
+	return "[%{time yyyy-MM-dd hh:mm:ss.zzz}] %{message}";
+}
+
+void logMessageHandler(QtMsgType type, const QMessageLogContext& context, const QString& msg)
+{
+	QString message = qFormatLogMessage(type, context, msg);
+
+	checkLogFile();
+	logFile.write(message.toUtf8() + "\n");
+
+	QTextStream out(stdout);
+	out << message << Qt::endl;
+}