core/log: add read-log --filter

src/core/logging.cpp

@@ -7,12 +7,14 @@
 #include <qendian.h>
 #include <qhash.h>
 #include <qhashfunctions.h>
+#include <qlist.h>
 #include <qlogging.h>
 #include <qloggingcategory.h>
 #include <qnamespace.h>
 #include <qobject.h>
 #include <qobjectdefs.h>
 #include <qstring.h>
+#include <qstringview.h>
 #include <qsysinfo.h>
 #include <qtenvironmentvariables.h>
 #include <qtextstream.h>
@@ -23,6 +25,7 @@
 #include <sys/sendfile.h>
 
 #include "logging_p.hpp"
+#include "logging_qtprivate.cpp" // NOLINT
 #include "paths.hpp"
 
 namespace qs::log {
@@ -82,6 +85,16 @@ void LogMessage::formatMessage(
 	if (color && msg.type == QtFatalMsg) stream << "\033[0m";
 }
 
+bool CategoryFilter::shouldDisplay(QtMsgType type) const {
+	switch (type) {
+	case QtDebugMsg: return this->debug;
+	case QtInfoMsg: return this->info;
+	case QtWarningMsg: return this->warn;
+	case QtCriticalMsg: return this->critical;
+	default: return true;
+	}
+}
+
 LogManager::LogManager(): stdoutStream(stdout) {}
 
 void LogManager::messageHandler(
@@ -98,14 +111,7 @@ void LogManager::messageHandler(
 	const auto* key = static_cast<const void*>(context.category);
 
 	if (self->sparseFilters.contains(key)) {
-		auto filter = self->sparseFilters.value(key);
-		switch (type) {
-		case QtDebugMsg: display = filter.debug; break;
-		case QtInfoMsg: display = filter.info; break;
-		case QtWarningMsg: display = filter.warn; break;
-		case QtCriticalMsg: display = filter.critical; break;
-		default: break;
-		}
+		display = self->sparseFilters.value(key).shouldDisplay(type);
 	}
 
 	if (display) {
@@ -520,7 +526,8 @@ start:
 			slot->time = this->lastMessageTime;
 		}
 	} else {
-		auto category = this->categories.value(next - EncodedLogOpcode::BeginCategories);
+		auto categoryId = next - EncodedLogOpcode::BeginCategories;
+		auto category = this->categories.value(categoryId);
 
 		quint8 field = 0;
 		if (!this->reader.readU8(&field)) return false;
@@ -555,6 +562,7 @@ start:
 		if (!this->readString(&body)) return false;
 
 		*slot = LogMessage(msgType, QLatin1StringView(category), body, this->lastMessageTime);
+		slot->readCategoryId = categoryId;
 	}
 
 	this->recentMessages.emplace(*slot);
@@ -633,7 +641,17 @@ bool EncodedLogReader::registerCategory() {
 	return true;
 }
 
-bool readEncodedLogs(QIODevice* device) {
+bool readEncodedLogs(QIODevice* device, const QString& rulespec) {
+	using namespace qt_logging_registry;
+
+	QList<QLoggingRule> rules;
+
+	{
+		QLoggingSettingsParser parser;
+		parser.setContent(rulespec);
+		rules = parser.rules();
+	}
+
 	auto reader = EncodedLogReader();
 	reader.setDevice(device);
 
@@ -655,11 +673,36 @@ bool readEncodedLogs(QIODevice* device) {
 
 	auto color = LogManager::instance()->colorLogs;
 
+	auto filters = QHash<quint16, CategoryFilter>();
+
 	LogMessage message;
 	auto stream = QTextStream(stdout);
 	while (reader.read(&message)) {
-		LogMessage::formatMessage(stream, message, color, true);
-		stream << '\n';
+		CategoryFilter filter;
+		if (filters.contains(message.readCategoryId)) {
+			filter = filters.value(message.readCategoryId);
+		} else {
+			for (const auto& rule: rules) {
+				auto filterpass = rule.pass(message.category, QtDebugMsg);
+				if (filterpass != 0) filter.debug = filterpass > 0;
+
+				filterpass = rule.pass(message.category, QtInfoMsg);
+				if (filterpass != 0) filter.info = filterpass > 0;
+
+				filterpass = rule.pass(message.category, QtWarningMsg);
+				if (filterpass != 0) filter.warn = filterpass > 0;
+
+				filterpass = rule.pass(message.category, QtCriticalMsg);
+				if (filterpass != 0) filter.critical = filterpass > 0;
+			}
+
+			filters.insert(message.readCategoryId, filter);
+		}
+
+		if (filter.shouldDisplay(message.type)) {
+			LogMessage::formatMessage(stream, message, color, true);
+			stream << '\n';
+		}
 	}
 
 	stream << Qt::flush;

src/core/logging.hpp

@@ -33,6 +33,7 @@ struct LogMessage {
 	QDateTime time;
 	QLatin1StringView category;
 	QByteArray body;
+	quint16 readCategoryId = 0;
 
 	static void formatMessage(QTextStream& stream, const LogMessage& msg, bool color, bool timestamp);
 };
@@ -63,6 +64,8 @@ struct CategoryFilter {
 	    , warn(category->isWarningEnabled())
 	    , critical(category->isCriticalEnabled()) {}
 
+	[[nodiscard]] bool shouldDisplay(QtMsgType type) const;
+
 	bool debug = true;
 	bool info = true;
 	bool warn = true;
@@ -95,7 +98,7 @@ private:
 	LoggingThreadProxy threadProxy;
 };
 
-bool readEncodedLogs(QIODevice* device);
+bool readEncodedLogs(QIODevice* device, const QString& rulespec);
 
 } // namespace qs::log
 

src/core/logging_qtprivate.cpp

@@ -0,0 +1,159 @@
+// 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 <utility>
+
+#include <qbytearrayview.h>
+#include <qchar.h>
+#include <qflags.h>
+#include <qlist.h>
+#include <qlogging.h>
+#include <qloggingcategory.h>
+#include <qstringtokenizer.h>
+#include <qstringview.h>
+#include <qtypes.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);
+};
+
+class QLoggingSettingsParser {
+public:
+	void setContent(QStringView content);
+
+	[[nodiscard]] QList<QLoggingRule> rules() const { return this->mRules; }
+
+private:
+	void parseNextLine(QStringView line);
+
+private:
+	QList<QLoggingRule> mRules;
+};
+
+void QLoggingSettingsParser::setContent(QStringView content) {
+	this->mRules.clear();
+	for (auto line: qTokenize(content, u';')) this->parseNextLine(line);
+}
+
+void QLoggingSettingsParser::parseNextLine(QStringView line) {
+	// Remove whitespace at start and end of line:
+	line = line.trimmed();
+
+	const qsizetype equalPos = line.indexOf(u'=');
+	if (equalPos != -1) {
+		if (line.lastIndexOf(u'=') == equalPos) {
+			const auto key = line.left(equalPos).trimmed();
+			const QStringView pattern = key;
+			const auto valueStr = line.mid(equalPos + 1).trimmed();
+			int value = -1;
+			if (valueStr == QString("true")) value = 1;
+			else if (valueStr == QString("false")) value = 0;
+			QLoggingRule rule(pattern, (value == 1));
+			if (rule.flags != 0 && (value != -1)) this->mRules.append(std::move(rule));
+			else
+				qCWarning(logLogging, "Ignoring malformed logging rule: '%s'", line.toUtf8().constData());
+		} else {
+			qCWarning(logLogging, "Ignoring malformed logging rule: '%s'", line.toUtf8().constData());
+		}
+	}
+}
+
+QLoggingRule::QLoggingRule(QStringView pattern, bool enabled): messageType(-1), enabled(enabled) {
+	this->parse(pattern);
+}
+
+void QLoggingRule::parse(QStringView pattern) {
+	QStringView p;
+
+	// strip trailing ".messagetype"
+	if (pattern.endsWith(QString(".debug"))) {
+		p = pattern.chopped(6); // strlen(".debug")
+		this->messageType = QtDebugMsg;
+	} else if (pattern.endsWith(QString(".info"))) {
+		p = pattern.chopped(5); // strlen(".info")
+		this->messageType = QtInfoMsg;
+	} else if (pattern.endsWith(QString(".warning"))) {
+		p = pattern.chopped(8); // strlen(".warning")
+		this->messageType = QtWarningMsg;
+	} else if (pattern.endsWith(QString(".critical"))) {
+		p = pattern.chopped(9); // strlen(".critical")
+		this->messageType = QtCriticalMsg;
+	} else {
+		p = pattern;
+	}
+
+	const QChar asterisk = u'*';
+	if (!p.contains(asterisk)) {
+		this->flags = FullText;
+	} else {
+		if (p.endsWith(asterisk)) {
+			this->flags |= LeftFilter;
+			p = p.chopped(1);
+		}
+		if (p.startsWith(asterisk)) {
+			this->flags |= RightFilter;
+			p = p.mid(1);
+		}
+		if (p.contains(asterisk)) // '*' only supported at start/end
+			this->flags = PatternFlags();
+	}
+
+	this->category = p.toString();
+}
+
+int QLoggingRule::pass(QLatin1StringView cat, QtMsgType msgType) const {
+	// check message type
+	if (this->messageType > -1 && this->messageType != msgType) return 0;
+
+	if (this->flags == FullText) {
+		// full match
+		if (this->category == cat) return (this->enabled ? 1 : -1);
+		else return 0;
+	}
+
+	const qsizetype idx = cat.indexOf(this->category);
+	if (idx >= 0) {
+		if (this->flags == MidFilter) {
+			// matches somewhere
+			return (this->enabled ? 1 : -1);
+		} else if (this->flags == LeftFilter) {
+			// matches left
+			if (idx == 0) return (this->enabled ? 1 : -1);
+		} else if (this->flags == RightFilter) {
+			// matches right
+			if (idx == (cat.size() - this->category.size())) return (this->enabled ? 1 : -1);
+		}
+	}
+	return 0;
+}
+
+} // namespace qt_logging_registry
+
+} // namespace qs::log

src/core/main.cpp

@@ -140,9 +140,17 @@ int qs_main(int argc, char** argv) {
 		);
 
 		/// ---
-		QStringOption logpath;
+		QStringOption logPath;
+		QStringOption logFilter;
 		auto* readLog = app.add_subcommand("read-log", "Read a quickshell log file.");
-		readLog->add_option("path", logpath, "Path to the log file to read")->required();
+		readLog->add_option("path", logPath, "Path to the log file to read")->required();
+
+		readLog->add_option(
+		    "-f,--filter",
+		    logFilter,
+		    "Logging categories to display. (same syntax as QT_LOGGING_RULES)"
+		);
+
 		readLog->add_flag("--no-color", noColor, "Do not color the log output. (Env:NO_COLOR)");
 
 		CLI11_PARSE(app, argc, argv);
@@ -153,15 +161,15 @@ int qs_main(int argc, char** argv) {
 		LogManager::init(!noColor, sparseLogsOnly);
 
 		if (*readLog) {
-			auto file = QFile(*logpath);
+			auto file = QFile(*logPath);
 			if (!file.open(QFile::ReadOnly)) {
-				qCritical() << "Failed to open log for reading:" << *logpath;
+				qCritical() << "Failed to open log for reading:" << *logPath;
 				return -1;
 			} else {
-				qInfo() << "Reading log" << *logpath;
+				qInfo() << "Reading log" << *logPath;
 			}
 
-			return qs::log::readEncodedLogs(&file) ? 0 : -1;
+			return qs::log::readEncodedLogs(&file, *logFilter) ? 0 : -1;
 		} else {
 
 			// NOLINTBEGIN