Implement portable mode

src/kiwixapp.cpp

@@ -142,38 +142,40 @@ void KiwixApp::newTab()
 
 QString KiwixApp::findLibraryDirectory()
 {
-  // Check for library.xml in the same directory than the executable (portable kiwix-desktop)
-  auto currentDataDir = QString::fromStdString(kiwix::removeLastPathElement(kiwix::getExecutablePath()));
-  auto libraryFile = QFileInfo(currentDataDir, "library.xml");
-  if (libraryFile.exists())
-    return currentDataDir;
-
-  // Check for default dataDirectory.
-  currentDataDir = getDataDirectory();
-  libraryFile = QFileInfo(currentDataDir, "library.xml");
-  if (libraryFile.exists())
-    return currentDataDir;
-
-  // There is no library.xml in default dataDirectory.
-  // Either, it is a first launch, or user used a pre-release version with wrong directory.
-  // Let's try to move data from old directory to new one if needed.
-  auto oldDataDir = QDir(currentDataDir);
-  oldDataDir.cdUp();
-  libraryFile = QFileInfo(oldDataDir, "library.xml");
-  if (libraryFile.exists()) {
-    // We have to move all zims file and xml file to the new dataDir
-    for (auto& fileInfo: oldDataDir.entryInfoList({"*.zim", "library*.xml"})) {
-      auto newFileInfo = QFileInfo(currentDataDir, fileInfo.fileName());
-      QFile::rename(fileInfo.absoluteFilePath(), newFileInfo.absoluteFilePath());
-    }
-    // Aria2 store informations about the current download using absolute path.
-    // Let's remove everything. User will loose its ongoing download but it should be pretty rare.
-    for (auto& fileInfo: oldDataDir.entryInfoList({"*.aria2", "*.meta4", "kiwix.session"})) {
-      QFile::remove(fileInfo.absoluteFilePath());
+    auto currentDataDir = QString::fromStdString(kiwix::removeLastPathElement(kiwix::getExecutablePath()));
+
+    if (isPortableMode())
+        return currentDataDir + QDir::separator() + "data";
+
+    // Check for library.xml in the same directory as the executable.
+    auto libraryFile = QFileInfo(currentDataDir, "library.xml");
+    if (libraryFile.exists())
+        return currentDataDir;
+
+    // Check for default dataDirectory.
+    currentDataDir = getDataDirectory();
+    libraryFile = QFileInfo(currentDataDir, "library.xml");
+    if (libraryFile.exists())
+        return currentDataDir;
+
+    // Check if this is a pre-release version with wrong directory.
+    auto oldDataDir = QDir(currentDataDir);
+    oldDataDir.cdUp();
+    libraryFile = QFileInfo(oldDataDir, "library.xml");
+    if (libraryFile.exists()) {
+        // We have to move all zim files and xml file to the new dataDir
+        for (auto& fileInfo: oldDataDir.entryInfoList({"*.zim", "library*.xml"})) {
+            auto newFileInfo = QFileInfo(currentDataDir, fileInfo.fileName());
+            QFile::rename(fileInfo.absoluteFilePath(), newFileInfo.absoluteFilePath());
+        }
+        // Aria2 stores information about the current download using absolute path.
+        // Let's remove everything. User will lose its ongoing download but it should be pretty rare.
+        for (auto& fileInfo: oldDataDir.entryInfoList({"*.aria2", "*.meta4", "kiwix.session"}))
+            QFile::remove(fileInfo.absoluteFilePath());
     }
-  }
 
-  return currentDataDir;
+    // This is a first launch
+    return currentDataDir;
 }
 
 void KiwixApp::restoreTabs()

src/settingsmanager.cpp

@@ -9,6 +9,11 @@
 
 QString getDataDirectory()
 {
+    if (isPortableMode()) {
+        auto currentDataDir = QString::fromStdString(kiwix::removeLastPathElement(kiwix::getExecutablePath()));
+        return currentDataDir + QDir::separator() + "data";
+    }
+
     QString dataDir = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);
 
     if (!dataDir.isEmpty() && QDir().mkpath(dataDir))
@@ -17,9 +22,30 @@ QString getDataDirectory()
     return QString::fromStdString(kiwix::getCurrentDirectory());
 }
 
+bool isPortableMode() 
+{
+    auto currentDataDir = QString::fromStdString(kiwix::removeLastPathElement(kiwix::getExecutablePath()));
+    auto portableFile = QFileInfo(currentDataDir, ".portable");
+
+    return portableFile.exists();
+}
+
+namespace {
+
+QString getSettingsConfPath() 
+{
+    QString confDirectory = isPortableMode() ? 
+                            getDataDirectory() :
+                            QStandardPaths::writableLocation(QStandardPaths::AppConfigLocation); 
+
+    return confDirectory + QDir::separator() + "Kiwix-desktop.conf";
+}
+
+}
+
 SettingsManager::SettingsManager(QObject *parent)
     : QObject(parent),
-    m_settings("Kiwix", "Kiwix-desktop"),
+    m_settings(getSettingsConfPath(), QSettings::NativeFormat),
     m_view(nullptr)
 {
     initSettings();
@@ -162,7 +188,8 @@ void SettingsManager::initSettings()
 {
     m_kiwixServerPort = m_settings.value("localKiwixServer/port", 8080).toInt();
     m_zoomFactor = m_settings.value("view/zoomFactor", 1).toDouble();
-    m_downloadDir = m_settings.value("download/dir", getDataDirectory()).toString();
+    QString dataDir = getDataDirectory();
+    m_downloadDir = isPortableMode() ? dataDir : m_settings.value("download/dir", dataDir).toString();
     m_kiwixServerIpAddress = m_settings.value("localKiwixServer/ipAddress", QString("0.0.0.0")).toString();
     m_monitorDir = m_settings.value("monitor/dir", QString("")).toString();
     m_moveToTrash = m_settings.value("moveToTrash", true).toBool();

src/settingsmanager.h

@@ -78,4 +78,6 @@ public slots:
 };
 
 QString getDataDirectory();
+bool isPortableMode();
+
 #endif // SETTINGSMANAGER_H