Add bilingual support (English/Greek) with live language switching

.github/workflows/build.yml

@@ -24,7 +24,7 @@ jobs:
         sudo apt-get update
         sudo apt-get install -y \
           build-essential cmake \
-          qt6-base-dev qt6-tools-dev-tools \
+          qt6-base-dev qt6-tools-dev qt6-tools-dev-tools \
           libqt6widgets6 \
           cppcheck \
           dpkg-dev

.gitignore

@@ -1,5 +1,6 @@
 # .idea
 .idea/
+.vscode/
 
 # Executable
 UniBackpack

CMakeLists.txt

@@ -4,7 +4,7 @@ project(UniBackpack VERSION 0.1 LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets Network)
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets Network LinguistTools)
 
 set(CMAKE_AUTOMOC ON) # Handles Signals/Slots
 set(CMAKE_AUTORCC ON) # Handles .qrc resource files
@@ -38,6 +38,15 @@ target_link_libraries(UniBackpack PRIVATE
         Qt6::Network
 )
 
+# --- Internationalization (i18n) ---
+# Compiles .ts -> .qm and embeds them under ":/i18n/" automatically.
+# Run "cmake --build build --target update_translations" to populate .ts from tr() strings.
+qt_add_translations(UniBackpack
+        TS_FILES
+        translations/unibackpack_en.ts
+        translations/unibackpack_el.ts
+)
+
 install(TARGETS UniBackpack DESTINATION bin)
 
 # CPack configuration to generate the Debian installer (.deb)

README.md

@@ -21,7 +21,7 @@ sudo pacman -S base-devel cmake qt6-base qt6-tools polkit
 
 **For Debian / Ubuntu / Linux Mint:**
 ```bash
-sudo apt install build-essential cmake qt6-base-dev qt6-tools-dev-tools policykit-1
+sudo apt install build-essential cmake qt6-base-dev qt6-tools-dev qt6-tools-dev-tools policykit-1
 ```
 
 ## Project Structure

include/Downloader.hpp

@@ -29,6 +29,7 @@ class Downloader : public QObject {
 	signals:
 		void progress_updated(int percentage);
 		void status_message(const QString &message);
+		void status_update(const QString &message);
 		void download_completed(bool success);
 };
 

include/MainWindow.hpp

@@ -6,6 +6,9 @@
 #include <QMainWindow>
 #include <QStandardItemModel>
 #include <QModelIndex>
+#include <QTranslator>
+
+void applyTranslator(const QString &locale);
 
 QT_BEGIN_NAMESPACE
 namespace Ui { class MainWindow; }
@@ -18,6 +21,10 @@ class MainWindow : public QMainWindow
 	public:
     		MainWindow(QWidget *parent = nullptr);
 		~MainWindow(); 
+		void retranslate();
+
+	protected:
+		void changeEvent(QEvent *event) override;
 
 	private slots: 
 		void on_university_selection(const QModelIndex &index);

src/Downloader.cpp

@@ -28,11 +28,15 @@ bool Downloader::is_in_pacman_repo(const QString &package_name) {
     process.start("pacman", QStringList() << "-Si" << package_name);
     process.waitForFinished();
     if (process.exitCode() == 0) {
-        emit status_message("Found: " + package_name);
+        QString msg = tr("Found: %1").arg(package_name);
+        emit status_message(msg);
+        emit status_update(msg);
         QCoreApplication::processEvents();
         return true;
     } else {
-        emit status_message("Not in repos: " + package_name);
+        QString msg = tr("Not in repos: %1").arg(package_name);
+        emit status_message(msg);
+        emit status_update(msg);
         QCoreApplication::processEvents();
         return false;
     }
@@ -46,11 +50,15 @@ bool Downloader::is_in_apt_repo(const QString &package_name) {
     QString stdout_output = process.readAllStandardOutput();
 
     if (process.exitCode() == 0 && stdout_output.contains("Package:")) {
-        emit status_message("Found: " + package_name);
+        QString msg = tr("Found: %1").arg(package_name);
+        emit status_message(msg);
+        emit status_update(msg);
         QCoreApplication::processEvents();
         return true;
     } else {
-        emit status_message("Not in repos: " + package_name);
+        QString msg = tr("Not in repos: %1").arg(package_name);
+        emit status_message(msg);
+        emit status_update(msg);
         QCoreApplication::processEvents();
         return false;
     }
@@ -62,7 +70,9 @@ QStringList Downloader::read_package_list(bool standard_package_manager, QString
 
     if (standard_package_manager && package_manager == "pacman") {
         QString filepath_of_list = ":/lists/" + name_of_university + "/" + name_of_department + "/pacman_list.txt";
-        emit status_message("Checking packages for " + name_of_department + "...");
+        QString msg = tr("Checking packages for %1...").arg(name_of_department);
+        emit status_message(msg);
+        emit status_update(msg);
         QFile file(filepath_of_list);
         if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
             qDebug() << "Critical Error: Could not open the file!" << file.errorString();
@@ -72,7 +82,9 @@ QStringList Downloader::read_package_list(bool standard_package_manager, QString
         while (!in.atEnd()) {
             QString package = in.readLine().trimmed();
             if (!package.isEmpty() && is_in_pacman_repo(package)) {
-                emit status_message("Adding: " + package);
+                QString addMsg = tr("Adding: %1").arg(package);
+                emit status_message(addMsg);
+                emit status_update(addMsg);
                 installable_with_standard_package_manager.append(package);
             }
         }
@@ -82,7 +94,9 @@ QStringList Downloader::read_package_list(bool standard_package_manager, QString
 
     if (!standard_package_manager && package_manager == "pacman") {
         QString filepath_of_list = ":/lists/" + name_of_university + "/" + name_of_department + "/pacman_list.txt";
-        emit status_message("Checking packages for " + name_of_department + "...");
+        QString msg = tr("Checking packages for %1...").arg(name_of_department);
+        emit status_message(msg);
+        emit status_update(msg);
         QFile file(filepath_of_list);
         if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
             qDebug() << "Critical Error: Could not open the file!" << file.errorString();
@@ -92,7 +106,9 @@ QStringList Downloader::read_package_list(bool standard_package_manager, QString
         while (!in.atEnd()) {
             QString package = in.readLine().trimmed();
             if (!package.isEmpty() && !is_in_pacman_repo(package)) {
-                emit status_message("Adding (non-standard): " + package);
+                QString addMsg = tr("Adding (non-standard): %1").arg(package);
+                emit status_message(addMsg);
+                emit status_update(addMsg);
                 installable_with_non_standard_package_manager.append(package);
             }
         }
@@ -102,7 +118,9 @@ QStringList Downloader::read_package_list(bool standard_package_manager, QString
 
     if (standard_package_manager && package_manager == "apt") {
         QString filepath_of_list = ":/lists/" + name_of_university + "/" + name_of_department + "/apt_list.txt";
-        emit status_message("Checking packages for " + name_of_department + "...");
+        QString msg = tr("Checking packages for %1...").arg(name_of_department);
+        emit status_message(msg);
+        emit status_update(msg);
         QFile file(filepath_of_list);
         if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
             qDebug() << "Critical Error: Could not open the file!" << file.errorString();
@@ -112,7 +130,9 @@ QStringList Downloader::read_package_list(bool standard_package_manager, QString
         while (!in.atEnd()) {
             QString package = in.readLine().trimmed();
             if (!package.isEmpty() && is_in_apt_repo(package)) {
-                emit status_message("Adding: " + package);
+                QString addMsg = tr("Adding: %1").arg(package);
+                emit status_message(addMsg);
+                emit status_update(addMsg);
                 installable_with_standard_package_manager.append(package);
             }
         }
@@ -122,7 +142,9 @@ QStringList Downloader::read_package_list(bool standard_package_manager, QString
 
     if (!standard_package_manager && package_manager == "apt") {
         QString filepath_of_list = ":/lists/" + name_of_university + "/" + name_of_department + "/apt_list.txt";
-        emit status_message("Checking packages for " + name_of_department + "...");        
+        QString msg = tr("Checking packages for %1...").arg(name_of_department);
+emit status_message(msg);
+emit status_update(msg);        
         QFile file(filepath_of_list);
         if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
             qDebug() << "Critical Error: Could not open the file!" << file.errorString();
@@ -132,7 +154,9 @@ QStringList Downloader::read_package_list(bool standard_package_manager, QString
         while (!in.atEnd()) {
             QString package = in.readLine().trimmed();
             if (!package.isEmpty() && !is_in_apt_repo(package)) {
-                emit status_message("Adding (non-standard): " + package);
+                QString addMsg = tr("Adding (non-standard): %1").arg(package);
+                emit status_message(addMsg);
+                emit status_update(addMsg);;
                 installable_with_non_standard_package_manager.append(package);
             }
         }
@@ -148,9 +172,8 @@ void Downloader::download_via_pacman(const QStringList &list_to_be_downloaded) {
     // there is a problem with pacman -Syu though, so the user should be alerted about that
     QMessageBox::warning(
         nullptr,
-        "Warning",
-        "It is advised to update your system before proceeding."
-        "\nRun sudo pacman -Syu"
+        tr("Warning"),
+        tr("It is advised to update your system before proceeding.\nRun sudo pacman -Syu")
     );
 
     if (list_to_be_downloaded.isEmpty()) {