Remove preset directory if empty.

include/system.hpp

@@ -26,6 +26,10 @@ void copyFile(const std::string& srcPath, const std::string& destPath);
 The parent directory must exist.
 */
 void createDirectory(const std::string& path);
+/** Deletes a directory.
+The directory must be empty. Fails silently.
+*/
+void removeDirectory(const std::string& path);
 /** Returns the number of logical simultaneous multithreading (SMT) (e.g. Intel Hyperthreaded) threads on the CPU. */
 int getLogicalCoreCount();
 /** Sets a name of the current thread for debuggers and OS-specific process viewers. */

src/app/ModuleWidget.cpp

@@ -652,17 +652,22 @@ void ModuleWidget::loadDialog() {
 void ModuleWidget::saveDialog() {
 	std::string presetDir = asset::user("presets");
 	system::createDirectory(presetDir);
-	presetDir += "/" + model->plugin->slug;
-	system::createDirectory(presetDir);
-	presetDir += "/" + model->slug;
-	system::createDirectory(presetDir);
+	std::string pluginPresetDir = presetDir + "/" + model->plugin->slug;
+	system::createDirectory(pluginPresetDir);
+	std::string modulePresetDir = pluginPresetDir + "/" + model->slug;
+	system::createDirectory(modulePresetDir);
+	// Delete directory if empty
+	DEFER({
+		system::removeDirectory(modulePresetDir);
+		system::removeDirectory(pluginPresetDir);
+	});
 
 	osdialog_filters* filters = osdialog_filters_parse(PRESET_FILTERS);
 	DEFER({
 		osdialog_filters_free(filters);
 	});
 
-	char* path = osdialog_file(OSDIALOG_SAVE, presetDir.c_str(), "Untitled.vcvm", filters);
+	char* path = osdialog_file(OSDIALOG_SAVE, modulePresetDir.c_str(), "Untitled.vcvm", filters);
 	if (!path) {
 		// No path selected
 		return;

src/system.cpp

@@ -137,6 +137,11 @@ void createDirectory(const std::string& path) {
 }
 
 
+void removeDirectory(const std::string& path) {
+	rmdir(path.c_str());
+}
+
+
 int getLogicalCoreCount() {
 	return std::thread::hardware_concurrency();
 }