Write the selected language to our config file and read it in and use it when SD starts

src/mainwindow.cpp

@@ -220,11 +220,18 @@ void MainWindow::loadLanguage(QString& rLanguage) {
     qDebug() << __func__ << ": currLang=" << m_currLang << "  rLanguage=" << rLanguage;
 
     QString lang = rLanguage;
-    lang.chop(1); // remove trailing )
+
+    // this allows us to call this function with just a locale such as "zh"
+    if(lang.size() > 3) {
+        lang.chop(1); // remove trailing )
+    }
 
     // remove everything up to and including the first (
     lang = lang.remove(0, lang.indexOf("(") + 1);
 
+    // write this language (the locale shortcode) out to config file
+    Settings::getInstance()->set_language(lang);
+
     // NOTE: language codes can be 2 or 3 letters
     // https://www.loc.gov/standards/iso639-2/php/code_list.php
 
@@ -518,6 +525,9 @@ void MainWindow::setupSettingsModal() {
         //m_currLang = defaultLocale;
         //qDebug() << __func__ << ": changed m_currLang to " << defaultLocale;
 
+        m_currLang = Settings::getInstance()->get_language();
+        qDebug() << __func__ << ": got a currLang=" << m_currLang << " from config file";
+
         //QString defaultLang = QLocale::languageToString(QLocale("en").language());
         settings.comboBoxLanguage->addItem("English (en)");
 
@@ -550,7 +560,7 @@ void MainWindow::setupSettingsModal() {
             //settings.comboBoxLanguage->addItem(action);
             settings.comboBoxLanguage->addItem(lang + " (" + locale + ")");
             qDebug() << __func__ << ": added lang=" << lang << " locale=" << locale << " defaultLocale=" << defaultLocale << " m_currLang=" << m_currLang;
-            //qDebug() << __func__ << ": " << m_currLang << " ?= " << locale;
+            qDebug() << __func__ << ": m_currLang=" << m_currLang << " ?= locale=" << locale;
 
             //if (defaultLocale == locale) {
             if (m_currLang == locale) {
@@ -562,8 +572,13 @@ void MainWindow::setupSettingsModal() {
         settings.comboBoxLanguage->model()->sort(0,Qt::AscendingOrder);
         qDebug() << __func__ <<": sorted translations";
 
-        QString lang = QLocale::languageToString(QLocale(m_currLang).language());
+        //QString lang = QLocale::languageToString(QLocale(m_currLang).language());
+        QString lang = QLocale(m_currLang).nativeLanguageName(); //locale.language());
+
+        auto first = QString(lang.at(0)).toUpper();
+        lang = first + lang.right(lang.size()-1);
         qDebug() << __func__ << ": looking for " << lang + " (" + m_currLang + ")";
+        //qDebug() << __func__ << ": looking for " << m_currLang;
         int lang_index = settings.comboBoxLanguage->findText(lang + " (" + m_currLang + ")", Qt::MatchExactly);
 
         qDebug() << __func__ << ": setting comboBoxLanguage index to " << lang_index;

src/mainwindow.h

@@ -74,6 +74,8 @@ public:
     Logger*      logger;
 
     void doClose();
+    // loads a language by the given language shortcode (e.g. de, en)
+    void loadLanguage(QString& rLanguage);
 
 protected:
     // this event is called, when a new translator is loaded or the system language is changed
@@ -86,8 +88,6 @@ protected slots:
 private:    
     void closeEvent(QCloseEvent* event);
 
-    // loads a language by the given language shortcode (e.g. de, en)
-    void loadLanguage(QString& rLanguage);
 
     void setupSendTab();
     void setupPeersTab();

src/rpc.cpp

@@ -63,6 +63,12 @@ RPC::RPC(MainWindow* main) {
     qDebug() << __func__ << "Done settings up all timers";
 
     usedAddresses = new QMap<QString, bool>();
+
+    auto lang = Settings::getInstance()->get_language();
+    qDebug() << __func__ << ": found lang="<< lang << " in config file";
+
+    main->loadLanguage(lang);
+    qDebug() << __func__ << ": setting UI to lang="<< lang << " found in config file";
 }
 
 RPC::~RPC() {

src/settings.cpp

@@ -365,6 +365,18 @@ void Settings::set_currency_name(QString currency_name) {
     QSettings().setValue("options/currency_name", currency_name);
 }
 
+QString Settings::get_language() {
+    // TODO: use the default system language if none is set
+    auto lang = QSettings().value("options/language", "en").toString();
+    qDebug() << __func__ << ": found lang=" << lang << " in config file";
+    return lang;
+}
+
+void Settings::set_language(QString lang) {
+    qDebug() << __func__ << ": setting lang=" << lang << " in config file";
+    QSettings().setValue("options/language", lang);
+}
+
 
 bool Settings::removeFromHushConf(QString confLocation, QString option) {
     if (confLocation.isEmpty())

src/settings.h

@@ -89,6 +89,9 @@ public:
     QString get_currency_name();
     void set_currency_name(QString currency_name);
 
+    QString get_language();
+    void set_language(QString lang);
+
     void    setUsingHushConf(QString confLocation);
     const   QString& getHushdConfLocation() { return _confLocation; }