cli arg to load external translation file

main.cpp

@@ -44,6 +44,7 @@ int main(int argc, char *argv[]) {
                            "\t--disable-shaders\tDisable OpenGL shaders (for debugging)\n"
                            "\t--no-debug\t\tDisable internal debug log and output directly to console\n"
                            "\t--disable-blend-modes\tDisable shader-based blending for older GPUs\n"
+                           "\t--translation <file>\tSet an external language file to use\n"
                            "\n", argv[0]);
 					return 0;
 				} else if (!strcmp(argv[i], "--fullscreen") || !strcmp(argv[i], "-f")) {
@@ -54,6 +55,16 @@ int main(int argc, char *argv[]) {
 					use_internal_logger = false;
 				} else if (!strcmp(argv[i], "--disable-blend-modes")) {
 					disable_blending = true;
+                } else if (!strcmp(argv[i], "--translation")) {
+                    if (i + 1 < argc && argv[i + 1][0] != '-') {
+                        // load translation file
+                        external_translation_file = argv[i + 1];
+
+                        i++;
+                    } else {
+                        printf("[ERROR] No translation file specified\n");
+                        return 1;
+                    }
 				} else {
 					printf("[ERROR] Unknown argument '%s'\n", argv[1]);
 					return 1;

mainwindow.cpp

@@ -57,6 +57,9 @@ MainWindow* mainWindow;
 #define DEFAULT_CSS "QPushButton::checked { background: rgb(25, 25, 25); }"
 #define OLIVE_FILE_FILTER "Olive Project (*.ove)"
 
+// load external translation file
+QString external_translation_file;
+
 QTimer autorecovery_timer;
 QString config_fn;
 bool demoNoticeShown = false;
@@ -207,10 +210,14 @@ MainWindow::MainWindow(QWidget *parent, const QString &an) :
 	}
 
     // load preferred language from file
-    if (!config.language_file.isEmpty()
-            && QFileInfo::exists(config.language_file)) {
+    QString language_file = external_translation_file.isEmpty() ?
+                config.language_file :
+                external_translation_file;
+
+    if (!language_file.isEmpty()
+            && QFileInfo::exists(language_file)) {
         QTranslator* translator = new QTranslator(this);
-        translator->load(config.language_file);
+        translator->load(language_file);
         QApplication::installTranslator(translator);
     }
 

mainwindow.h

@@ -213,4 +213,7 @@ private:
 
 extern MainWindow* mainWindow;
 
+// load external translation file
+extern QString external_translation_file;
+
 #endif // MAINWINDOW_H