directory choosing improved

src/cpp/qtapp/main.cpp

@@ -75,9 +75,14 @@ struct Page {
     int end;
 };
 
-QString                  workingPath   = "/home/jorenchik/Code/mdemory/memorybase";
+// @Debug: set the default directory for convenience. It should be configured by user
+// or set to "".
 std::string              currentPath   = "/home/jorenchik/Code/mdemory/memorybase";
+std::string              currentMdem   = "";
+/*std::string              currentPath   = "";*/
 QFileSystemModel        *model;
+QLabel                  *mdemLabel;
+QTreeView               *mdemList;
 
 // Mdem list
 QLabel                  *deckListLabel;
@@ -391,25 +396,34 @@ void releaseError(ErrorView** item) {
 	std::cout << std::format("Released, current pool size: {}\n", errorPool.size());
 }
 
-void loadMdem() {
-	auto file = std::ifstream(currentPath);
+void reloadMdem() {
+	auto file = std::ifstream(currentMdem);
 	std::string content;
+
+	for (auto mdem: mdems) {
+		mdem->wMdem.hide();
+	}
+	for (auto question: questions) {
+		delete question;
+	}
+	questions.clear();
+
+	std::smatch matches;
+	auto filenameMatched = std::regex_search(currentMdem, matches, lastPathElementExp); 
+	auto filename = matches[2];
+	if (filename.str().length() > 0) {
+		deckListLabel->setText(
+			QString::fromStdString(std::format("mdem: {}", filename.str()))
+		);
+	} else {
+		deckListLabel->setText("");
+	}
+
 	if (file) {
 		std::stringstream buffer;
 		buffer << file.rdbuf();
 		content = buffer.str();
 		auto res = transpile(content, true);
-		for (auto question: questions) {
-			delete question;
-		}
-		questions.clear();
-
-		std::smatch matches;
-		auto filenameMatched = std::regex_search(currentPath, matches, lastPathElementExp); 
-		auto filename = matches[2];
-		deckListLabel->setText(
-			QString::fromStdString(std::format("mdem: {}", filename.str()))
-		);
 
 		while (errorViews.size() > 0) {
 			auto errorView = errorViews.back();
@@ -419,7 +433,6 @@ void loadMdem() {
 		}
 
 		if (res.error == "") {
-
 			time_t trainedAt;
 			if (res.value.lastTrainedAt == 0) {
 				trainedAt = 0;
@@ -449,19 +462,42 @@ void loadMdem() {
 			);
 			errorView->box.show();
 			hMdemScroll->addWidget(&errorView->box);
-
 			hMdemScroll->addItem(mdemSpacer);
-			for (auto mdem: mdems) {
-				if (mdem->wMdem.isVisible()) {
-					mdem->wMdem.hide();
-				}
-			}
 		}
 	} else {
 		std::cout << std::format("Could not open the file: {}", currentPath) << std::endl;
 	}
 }
 
+void pickDirectory(QString directory) {
+	currentPath = directory.toStdString();
+
+	// Update tree view.
+	if (directory.length() <= 0) {
+		mdemLabel->setText(directory);
+		return;
+	}
+    mdemList->setRootIndex(model->setRootPath(directory));
+	std::smatch matches;
+	
+	// Update label.
+	auto filenameMatched = std::regex_search(
+		currentPath,
+		matches,
+		lastPathElementExp
+	); 
+	auto filename = matches[2];
+	mdemLabel->setText(QString::fromStdString(
+		std::format(
+			"memorybase: {}",
+			filename.str()
+		)
+	));
+
+	currentMdem = "";
+	reloadMdem();
+}
+
 int main(int argc, char *argv[]) {
     QApplication app(argc, argv);
     QMainWindow window;
@@ -479,11 +515,8 @@ int main(int argc, char *argv[]) {
 		fileDialog->connect(
 			fileDialog,
 			&QFileDialog::fileSelected,
-			[](QString directory
-		) {
-			workingPath = directory;
-			model->setRootPath(workingPath);
-		});
+			pickDirectory
+		);
 	});
 	menuBar->addMenu(menu);
 
@@ -496,12 +529,9 @@ int main(int argc, char *argv[]) {
     QVBoxLayout      *leftLayout = new QVBoxLayout();
     QWidget          *leftTop    = new QWidget();
     QVBoxLayout      *vLeftTop   = new QVBoxLayout();
-    QLabel           *mdemLabel  = new QLabel("mdems");
-    QTreeView        *mdemList   = new QTreeView();
+    mdemList                     = new QTreeView();
+    mdemLabel                    = new QLabel();
     model                        = new QFileSystemModel();
-	if (workingPath.length() > 0) {
-		model->setRootPath(workingPath);
-	}
 	mdemLabel->setStyleSheet(
 		"font-size: 17px;"
 		"font-weight: 400;"
@@ -521,15 +551,11 @@ int main(int argc, char *argv[]) {
 		&QTreeView::doubleClicked,
 		[](const QModelIndex &index) {
 			auto fileInfo = model->fileInfo(index);
-			currentPath = fileInfo.filePath().toStdString();
-			loadMdem();
+			currentMdem = fileInfo.filePath().toStdString();
+			reloadMdem();
 		}
 	);
 
-    QModelIndex rootIndex = model->index(
-		"/home/jorenchik/Code/mdemory/memorybase"
-	);
-    mdemList->setRootIndex(rootIndex);
     for (int col = 1; col < model->columnCount(); ++col) {
         mdemList->hideColumn(col);
     }
@@ -565,7 +591,7 @@ int main(int argc, char *argv[]) {
     // Buttons
     load->setText("Load");
     practice->setText("Practice");
-	QObject::connect(load, &QToolButton::clicked, &loadMdem);
+	QObject::connect(load, &QToolButton::clicked, &reloadMdem);
 
     // Mdems
     QScrollArea *mdemScroll    = new QScrollArea();
@@ -661,5 +687,9 @@ int main(int argc, char *argv[]) {
     window.setCentralWidget(hSplitter);
     window.show();
 
+	if (currentPath.length() > 0) {
+		pickDirectory(QString::fromStdString(currentPath));
+	}
+
     return app.exec();
 }