Select device using a command line option

pass --device=/dev/sda to select that device

BUG: 43485

src/gui/mainwindow.cpp

@@ -1336,3 +1336,15 @@ void MainWindow::checkFileSystemSupport()
                                  xi18nc("@title:window", "Missing File System Support Packages"),
                                  QStringLiteral("showInformationOnMissingFileSystemSupport"), KMessageBox::Notify | KMessageBox::AllowLink);
 }
+
+void MainWindow::setCurrentDeviceByName(const QString& name)
+{
+    // TODO: Port KPartitionManager away from KMessageBox into KMessageWidget.
+    // TODO: setSelectedDevice from m_ListDevices is not using a device name, but
+    // just issuing a match query on a string list, this will produce false results.
+    if (!m_ListDevices->setSelectedDevice(name)) {
+        KMessageBox::error(this,
+                           xi18nc("@info device should be inside of /dev", "Unrecognized device \"%1\" ", name),
+                           xi18nc("@title:window", "Error While Importing Partition Table"));
+    }
+}

src/gui/mainwindow.h

@@ -44,6 +44,9 @@ class MainWindow : public KXmlGuiWindow, public Ui::MainWindowBase
 public:
     explicit MainWindow(QWidget* parent = nullptr);
 
+    // for instance `/dev/sda`
+    void setCurrentDeviceByName(const QString& name);
+
 Q_SIGNALS:
     void settingsChanged();
     void scanFinished();

src/main.cpp

@@ -16,6 +16,7 @@
 
 #include <QApplication>
 #include <QCommandLineParser>
+#include <QCommandLineOption>
 
 #include <KAboutData>
 #include <KCrash>
@@ -57,7 +58,9 @@ int Q_DECL_IMPORT main(int argc, char* argv[])
 
     QCommandLineParser parser;
     aboutData.setupCommandLine(&parser);
-// FIXME    parser.addPositionalArgument(QStringLiteral("device"), xi18nc("@info:shell", "Device(s) to manage"), QStringLiteral("[device...]"));
+
+    QCommandLineOption deviceOption({QStringLiteral("device")}, xi18nc("@info:shell", "Device to manage"), QStringLiteral("device"));
+    parser.addOption(deviceOption);
 
     parser.process(app);
     aboutData.processCommandLine(&parser);
@@ -71,8 +74,14 @@ int Q_DECL_IMPORT main(int argc, char* argv[])
     if (!loadBackend())
         return 0;
 
+    const QString selectedDevice = parser.value(deviceOption);
+
     MainWindow* mainWindow = new MainWindow();
-    Q_UNUSED(mainWindow)
+    QObject::connect(mainWindow, &MainWindow::scanFinished, mainWindow, [mainWindow, selectedDevice] {
+        if (selectedDevice.length()) {
+            mainWindow->setCurrentDeviceByName(selectedDevice);
+        }
+    });
 
     return app.exec();
 }