feat(main): Add localization support

Add i18next with a custom backend to the main process to load
localization from file.

Missing localizations are written to a missing localizations file in
debug mode, but silently fall back in production mode.

We will also need to add a custom backend for the renderer process that
communicates with the main process.

(i18next-fs-electron-backend is not applicable here, because we need
localizations both in the main and renderer processes.)

Signed-off-by: Kristóf Marussy <kristof@marussy.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/packages/main/src/i18n/LocalizationRepository.ts b/packages/main/src/i18n/LocalizationRepository.ts
new file mode 100644
index 0000000..041449d
--- /dev/null
+++ b/packages/main/src/i18n/LocalizationRepository.ts
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C)  2022 Kristóf Marussy <kristof@marussy.com>
+ *
+ * This file is part of Sophie.
+ *
+ * Sophie is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, version 3.
+ *
+ * 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import type { ResourceKey } from 'i18next';
+
+export default interface LocatlizationRepository {
+  getResourceContents(
+    language: string,
+    namespace: string,
+  ): Promise<ResourceKey>;
+
+  getMissingResourceContents(
+    language: string,
+    namespace: string,
+  ): Promise<ResourceKey>;
+
+  setMissingResourceContents(
+    language: string,
+    namespace: string,
+    data: ResourceKey,
+  ): Promise<void>;
+}