Core: Add library clear function

include/mgba/core/library.h

@@ -36,6 +36,7 @@ void mLibraryDestroy(struct mLibrary*);
 struct VDir;
 struct VFile;
 void mLibraryLoadDirectory(struct mLibrary* library, const char* base);
+void mLibraryClear(struct mLibrary* library);
 
 size_t mLibraryCount(struct mLibrary* library, const struct mLibraryEntry* constraints);
 size_t mLibraryGetEntries(struct mLibrary* library, struct mLibraryListing* out, size_t numEntries, size_t offset, const struct mLibraryEntry* constraints);

src/core/library.c

@@ -339,6 +339,16 @@ static void _mLibraryDeleteEntry(struct mLibrary* library, struct mLibraryEntry*
 	sqlite3_step(library->insertPath);
 }
 
+void mLibraryClear(struct mLibrary* library) {
+	int result = sqlite3_exec(library->db,
+		"   BEGIN TRANSACTION;"
+		"\n DELETE FROM roots;"
+		"\n DELETE FROM roms;"
+		"\n DELETE FROM paths;"
+		"\n COMMIT;"
+		"\n VACUUM;", NULL, NULL, NULL);
+}
+
 size_t mLibraryCount(struct mLibrary* library, const struct mLibraryEntry* constraints) {
 	sqlite3_clear_bindings(library->count);
 	sqlite3_reset(library->count);

src/platform/qt/SettingsView.cpp

@@ -89,6 +89,7 @@ SettingsView::SettingsView(ConfigController* controller, InputController* inputC
 			m_ui.patchPath->setText(path);
 		}
 	});
+	connect(m_ui.clearCache, &QAbstractButton::pressed, this, &SettingsView::libraryCleared);
 
 	// TODO: Move to reloadConfig()
 	QVariant audioDriver = m_controller->getQtOption("audioDriver");

src/platform/qt/SettingsView.h

@@ -29,6 +29,7 @@ signals:
 	void audioDriverChanged();
 	void displayDriverChanged();
 	void pathsChanged();
+	void libraryCleared();
 
 private slots:
 	void selectBios(QLineEdit*);

src/platform/qt/SettingsView.ui

@@ -431,9 +431,6 @@
        </item>
        <item row="2" column="1">
         <widget class="QPushButton" name="clearCache">
-         <property name="enabled">
-          <bool>false</bool>
-         </property>
          <property name="text">
           <string>Clear cache</string>
          </property>

src/platform/qt/Window.cpp

@@ -460,6 +460,7 @@ void Window::openSettingsWindow() {
 	connect(settingsWindow, &SettingsView::audioDriverChanged, m_controller, &GameController::reloadAudioDriver);
 	connect(settingsWindow, &SettingsView::displayDriverChanged, this, &Window::mustRestart);
 	connect(settingsWindow, &SettingsView::pathsChanged, this, &Window::reloadConfig);
+	connect(settingsWindow, &SettingsView::libraryCleared, m_libraryView, &LibraryController::clear);
 	openView(settingsWindow);
 }
 

src/platform/qt/library/LibraryController.cpp

@@ -130,6 +130,20 @@ void LibraryController::addDirectory(const QString& dir) {
 	m_loaderThread.start();
 }
 
+void LibraryController::clear() {
+	if (!m_library) {
+		if (!m_loaderThread.isRunning() && m_loaderThread.m_library) {
+			m_library = m_loaderThread.m_library;
+			m_loaderThread.m_library = nullptr;
+		} else {
+			return;
+		}
+	}
+
+	mLibraryClear(m_library);
+	refresh();
+}
+
 void LibraryController::refresh() {
 	if (!m_library) {
 		if (!m_loaderThread.isRunning() && m_loaderThread.m_library) {

src/platform/qt/library/LibraryController.h

@@ -100,6 +100,9 @@ public:
 
 	void addDirectory(const QString& dir);
 
+public slots:
+	void clear();
+
 signals:
 	void startGame();
 	void doneLoading();