core/command: add log --follow

src/core/logging_qtprivate.hpp

@@ -0,0 +1,44 @@
+#pragma once
+
+// The logging rule parser from qloggingregistry_p.h and qloggingregistry.cpp.
+
+// Was unable to properly link the functions when directly using the headers (which we depend
+// on anyway), so below is a slightly stripped down copy. Making the originals link would
+// be preferable.
+
+#include <qflags.h>
+#include <qlogging.h>
+#include <qloggingcategory.h>
+#include <qstringview.h>
+
+namespace qs::log {
+Q_DECLARE_LOGGING_CATEGORY(logLogging);
+
+namespace qt_logging_registry {
+
+class QLoggingRule {
+public:
+	QLoggingRule();
+	QLoggingRule(QStringView pattern, bool enabled);
+	[[nodiscard]] int pass(QLatin1StringView categoryName, QtMsgType type) const;
+
+	enum PatternFlag {
+		FullText = 0x1,
+		LeftFilter = 0x2,
+		RightFilter = 0x4,
+		MidFilter = LeftFilter | RightFilter
+	};
+	Q_DECLARE_FLAGS(PatternFlags, PatternFlag)
+
+	QString category;
+	int messageType;
+	PatternFlags flags;
+	bool enabled;
+
+private:
+	void parse(QStringView pattern);
+};
+
+} // namespace qt_logging_registry
+
+} // namespace qs::log