Fix additional warnings when Carla is missing (#7722)

Fix additional warnings when Carla is missing
Adds new env var LMMS_EXCLUDE_LADSPA

---------

Co-authored-by: Dalton Messmer <messmer.dalton@gmail.com>

cmake/linux/apprun-hooks/carla-hook.sh

@@ -25,6 +25,7 @@ if command -v carla > /dev/null 2>&1; then
 else
 	echo "[$ME] Carla does not appear to be installed, we'll remove it from the plugin listing." >&2
 	export "LMMS_EXCLUDE_PLUGINS=libcarla,${LMMS_EXCLUDE_PLUGINS}"
+	export "LMMS_EXCLUDE_LADSPA=libcarla,${LMMS_EXCLUDE_LADSPA}"
 fi
 
 # Additional workarounds for library conflicts

include/PluginFactory.h

@@ -61,6 +61,7 @@ public:
 	~PluginFactory() = default;
 
 	static void setupSearchPaths();
+	static QList<QRegularExpression> getExcludePatterns(const char* envVar);
 
 	/// Returns the singleton instance of PluginFactory. You won't need to call
 	/// this directly, use pluginFactory instead.

src/core/LadspaManager.cpp

@@ -28,6 +28,8 @@
 #include <QDebug>
 #include <QDir>
 #include <QLibrary>
+#include <QList>
+#include <QRegularExpression>
 
 #include <cmath>
 
@@ -45,6 +47,8 @@ LadspaManager::LadspaManager()
 	// Make sure plugin search paths are set up
 	PluginFactory::setupSearchPaths();
 
+	QList<QRegularExpression> excludePatterns = PluginFactory::getExcludePatterns("LMMS_EXCLUDE_LADSPA");
+
 	QStringList ladspaDirectories = QString( getenv( "LADSPA_PATH" ) ).
 								split( LADSPA_PATH_SEPERATOR );
 	ladspaDirectories += ConfigManager::inst()->ladspaDir().split( ',' );
@@ -67,7 +71,15 @@ LadspaManager::LadspaManager()
 		QFileInfoList list = directory.entryInfoList();
 		for (const auto& f : list)
 		{
-				if(!f.isFile() || f.fileName().right( 3 ).toLower() !=
+			bool exclude = false;
+			for (const auto& pattern : excludePatterns) {
+				if (pattern.match(f.filePath()).hasMatch()) {
+					exclude = true;
+					break;
+				}
+			}
+
+			if (exclude || !f.isFile() || f.fileName().right(3).toLower() !=
 #ifdef LMMS_BUILD_WIN32
 													"dll"
 #else

src/core/PluginFactory.cpp

@@ -249,38 +249,50 @@ void PluginFactory::discoverPlugins()
 	m_descriptors = descriptors;
 }
 
-// Filter plugins based on environment variable, e.g. export LMMS_EXCLUDE_PLUGINS="libcarla"
-void PluginFactory::filterPlugins(QSet<QFileInfo>& files) {
-	// Get filter
-	QList<QRegularExpression> excludedPatterns;
-	QString excludePatternString = std::getenv("LMMS_EXCLUDE_PLUGINS");
+// Builds QList<QRegularExpression> based on environment variable envVar
+QList<QRegularExpression> PluginFactory::getExcludePatterns(const char* envVar) {
+	QList<QRegularExpression> excludePatterns;
+	QString excludePatternString = std::getenv(envVar);
 
 	if (!excludePatternString.isEmpty()) {
 		QStringList patterns = excludePatternString.split(',');
 		for (const QString& pattern : patterns) {
+			if (pattern.trimmed().isEmpty()) {
+				continue;
+			}
 			QRegularExpression regex(pattern.trimmed());
-			if (!pattern.trimmed().isEmpty() && regex.isValid()) {
-				excludedPatterns << regex;
+			if (regex.isValid()) {
+				excludePatterns << regex;
 			} else {
 				qWarning() << "Invalid regular expression:" << pattern;
 			}
 		}
 	}
+	return excludePatterns;
+}
+
+// Filter plugins based on environment variable, e.g. export LMMS_EXCLUDE_PLUGINS="libcarla"
+void PluginFactory::filterPlugins(QSet<QFileInfo>& files) {
+	// Get filter
+	QList<QRegularExpression> excludePatterns = getExcludePatterns("LMMS_EXCLUDE_PLUGINS");
+	if (excludePatterns.isEmpty()) {
+		return;
+	}
 
   	// Get files to remove
 	QSet<QFileInfo> filesToRemove;
 	for (const QFileInfo& fileInfo : files) {
-		bool excluded = false;
+		bool exclude = false;
 		QString filePath = fileInfo.filePath();
 
-		for (const QRegularExpression& pattern : excludedPatterns) {
+		for (const QRegularExpression& pattern : excludePatterns) {
 			if (pattern.match(filePath).hasMatch()) {
-				excluded = true;
+				exclude = true;
 				break;
 			}
 		}
 
-		if (excluded) {
+		if (exclude) {
 			filesToRemove.insert(fileInfo);
 		}
 	}