diff -r 87ee9824210b -r 7ef03c2b46ab src/basics.h
--- a/src/basics.h	Mon Jun 20 16:59:09 2022 +0300
+++ b/src/basics.h	Mon Jun 20 17:27:30 2022 +0300
@@ -26,6 +26,7 @@
 #include <set>
 #include <type_traits>
 #include <QDataStream>
+#include <QDateTime>
 #include <QDebug>
 #include <QObject>
 #include <QPointF>
@@ -295,3 +296,25 @@
 
 template<typename T>
 using Graph = std::deque<GraphEdge<T>>;
+
+struct Message
+{
+	QDateTime time;
+	enum { Info, Warning, Error } type;
+	QString text;
+};
+
+inline Message logInfo(const QString text)
+{
+	return Message{.time = QDateTime::currentDateTime(), .type = Message::Info, .text = text};
+}
+
+inline Message logWarning(const QString text)
+{
+	return Message{.time = QDateTime::currentDateTime(), .type = Message::Warning, .text = text};
+}
+
+inline Message logError(const QString text)
+{
+	return Message{.time = QDateTime::currentDateTime(), .type = Message::Error, .text = text};
+}