1 files changed, 93 insertions, 0 deletions
diff --git a/src/pinentry/qti18n.cpp b/src/pinentry/qti18n.cpp
new file mode 100644
index 00000000..8e6bb591
--- /dev/null
+++ b/src/pinentry/qti18n.cpp
@@ -0,0 +1,93 @@
+/* qti18n.cpp - Load qt translations for pinentry.
+ * Copyright 2021 g10 Code GmbH
+ * SPDX-FileCopyrightText: 2015 Lukáš Tinkl <[email protected]>
+ * SPDX-FileCopyrightText: 2021 Ingo Klöcker <[email protected]>
+ *
+ * Copied from k18n under the terms of LGPLv2 or later.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <QDebug>
+#include <QCoreApplication>
+#include <QLibraryInfo>
+#include <QLocale>
+#include <QTranslator>
+
+#include <memory>
+
+static bool loadCatalog(const QString &catalog, const QLocale &locale)
+{
+    auto translator = new QTranslator(QCoreApplication::instance());
+
+    if (!translator->load(locale, catalog, QString(), QLibraryInfo::location(QLibraryInfo::TranslationsPath))) {
+        qDebug() << "Loading the" << catalog << "catalog failed for locale" << locale;
+        delete translator;
+        return false;
+    }
+    QCoreApplication::instance()->installTranslator(translator);
+    return true;
+}
+
+static bool loadCatalog(const QString &catalog, const QLocale &locale, const QLocale &fallbackLocale)
+{
+    // try to load the catalog for locale
+    if (loadCatalog(catalog, locale)) {
+        return true;
+    }
+    // if this fails, then try the fallback locale (if it's different from locale)
+    if (fallbackLocale != locale) {
+        return loadCatalog(catalog, fallbackLocale);
+    }
+    return false;
+}
+
+// load global Qt translation, needed in KDE e.g. by lots of builtin dialogs (QColorDialog, QFontDialog) that we use
+static void loadTranslation(const QString &localeName, const QString &fallbackLocaleName)
+{
+    const QLocale locale{localeName};
+    const QLocale fallbackLocale{fallbackLocaleName};
+    // first, try to load the qt_ meta catalog
+    if (loadCatalog(QStringLiteral("qt_"), locale, fallbackLocale)) {
+        return;
+    }
+    // if loading the meta catalog failed, then try loading the four catalogs
+    // it depends on, i.e. qtbase, qtscript, qtmultimedia, qtxmlpatterns, separately
+    const auto catalogs = {
+        QStringLiteral("qtbase_"),
+        /* QStringLiteral("qtscript_"),
+        QStringLiteral("qtmultimedia_"),
+        QStringLiteral("qtxmlpatterns_"), */
+    };
+    for (const auto &catalog : catalogs) {
+        loadCatalog(catalog, locale, fallbackLocale);
+    }
+}
+
+static void load()
+{
+    // The way Qt translation system handles plural forms makes it necessary to
+    // have a translation file which contains only plural forms for `en`. That's
+    // why we load the `en` translation unconditionally, then load the
+    // translation for the current locale to overload it.
+    loadCatalog(QStringLiteral("qt_"), QLocale{QStringLiteral("en")});
+
+    const QLocale locale = QLocale::system();
+    if (locale.name() != QStringLiteral("en")) {
+        loadTranslation(locale.name(), locale.bcp47Name());
+    }
+}
+
+Q_COREAPP_STARTUP_FUNCTION(load)