I think I already finished the app lmao

.gitignore

@@ -11,6 +11,7 @@ CTestTestfile.cmake
 _deps
 CMakeUserPresets.json
 build/
+.DS_Store
 
 # CLion
 #  JetBrains specific template is maintained in a separate JetBrains.gitignore that can

CMakeLists.txt

@@ -1,11 +1,16 @@
 cmake_minimum_required(VERSION 4.2.3)
 
-project(textedit)
+project(Textedit)
 
 set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_AUTOMOC ON)
 
-find_package(Qt6 REQUIRED COMPONENTS Core Widgets)
+find_package(Qt6 REQUIRED COMPONENTS Widgets)
 
-add_executable(textedit src/main.cpp)
+add_executable(Textedit MACOSX_BUNDLE src/main.cpp)
 
-target_link_libraries(textedit PRIVATE Qt6::Core Qt6::Widgets)
+set_target_properties(Textedit PROPERTIES
+  WIN32_EXECUTABLE TRUE
+)
+
+target_link_libraries(Textedit PRIVATE Qt6::Widgets)

src/main.cpp

@@ -1,18 +1,80 @@
+#include <QtCore/QFile>
+#include <QtCore/QTextStream>
 #include <QtWidgets/QApplication>
+#include <QtWidgets/QFileDialog>
+#include <QtWidgets/QMainWindow>
+#include <QtWidgets/QMenuBar>
+#include <QtWidgets/QMessageBox>
 #include <QtWidgets/QTextEdit>
-#include <QtWidgets/QVBoxLayout>
-#include <QtWidgets/QWidget>
+
+class Editor : public QMainWindow {
+  Q_OBJECT
+
+  QTextEdit *edit;
+  QString currentPath;
+
+public:
+  Editor() {
+    edit = new QTextEdit(this);
+    setCentralWidget(edit);
+
+    auto *fileMenu = menuBar()->addMenu("File");
+    fileMenu->addAction("Open", QKeySequence::Open, this, &Editor::open);
+    fileMenu->addAction("Save", QKeySequence::Save, this, &Editor::save);
+    fileMenu->addAction("Save As", QKeySequence::SaveAs, this, &Editor::saveAs);
+
+    showMaximized();
+  }
+
+private:
+  bool write(const QString &filePath) {
+    QFile file(filePath);
+    if (!file.open(QIODevice::WriteOnly | QIODevice::Text)) {
+      QMessageBox::warning(this, {}, file.errorString());
+      return false;
+    }
+    QTextStream(&file) << edit->toPlainText();
+    return true;
+  }
+
+private slots:
+  void open() {
+    QString filePath =
+        QFileDialog::getOpenFileName(this, {}, {}, "All Files (*)");
+    if (filePath.isEmpty())
+      return;
+
+    QFile file(filePath);
+    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
+      QMessageBox::warning(this, {}, file.errorString());
+      return;
+    }
+
+    currentPath = filePath;
+    edit->setPlainText(QTextStream(&file).readAll());
+  }
+
+  void save() {
+    if (currentPath.isEmpty())
+      saveAs();
+    else
+      write(currentPath);
+  }
+
+  void saveAs() {
+    QString filePath =
+        QFileDialog::getSaveFileName(this, {}, {}, "All Files (*)");
+    if (filePath.isEmpty())
+      return;
+    if (write(filePath))
+      currentPath = filePath;
+  }
+};
+
+#include "main.moc"
 
 int main(int argc, char *argv[]) {
   QApplication app(argc, argv);
-  QWidget window;
-  QVBoxLayout *layout = new QVBoxLayout(&window);
-
-  QTextEdit *textEdit = new QTextEdit();
-
-  layout->setContentsMargins(0, 0, 0, 0);
-  layout->setSpacing(0);
-  layout->addWidget(textEdit);
-  window.showMaximized();
+  Editor w;
   return app.exec();
 }