Implement translations system

assets/langs.json

@@ -0,0 +1,3 @@
+{
+  "fr_FR": "fr"
+}

lib/main.dart

@@ -3,6 +3,7 @@ import 'package:comunic/helpers/database/database_helper.dart';
 import 'package:comunic/helpers/preferences_helper.dart';
 import 'package:comunic/ui/routes/home_route.dart';
 import 'package:comunic/ui/routes/login_route.dart';
+import 'package:comunic/utils/intl_utils.dart';
 import 'package:comunic/utils/ui_utils.dart';
 import 'package:flutter/material.dart';
 
@@ -17,6 +18,9 @@ void subMain() async {
   // Connect to database
   await DatabaseHelper.open();
 
+  // Get current system language
+  await initTranslations();
+
   runApp(ComunicApplication(
     darkMode: (await PreferencesHelper.getInstance())
         .getBool(PreferencesKeyList.ENABLE_DARK_THEME),

lib/utils/intl_utils.dart

@@ -1,7 +1,32 @@
+import 'dart:convert';
+
+import 'package:flutter/services.dart';
+import 'package:intl/intl_standalone.dart';
+
 /// Internationalization utilities
 ///
 /// @author Pierre HUBERT
 
+String _currLang;
+Map<String, Map<String, String>> translations;
+
+/// Initialize translations system
+///
+/// This method currently fetch the current user language
+Future<void> initTranslations() async {
+  _currLang = await findSystemLocale();
+
+  // Load the list of translations
+  final list = Map<String, String>.from(
+      jsonDecode(await rootBundle.loadString("assets/langs.json")));
+
+  translations = new Map();
+  for (final entry in list.entries) {
+    translations[entry.key] = Map<String, String>.from(jsonDecode(
+        await rootBundle.loadString("assets/langs/${entry.value}.json")));
+  }
+}
+
 /// Translate a string
 ///
 /// Translate a given [string] into the current language, if available
@@ -9,10 +34,14 @@
 /// Then apply the list of [args] to the string, each argument name is
 /// surrounded by '%'
 String tr(String string, {Map<String, String> args}) {
-  //TODO : create translation system
+  // Check if a translation is available
+  if (_currLang != null &&
+      translations.containsKey(_currLang) &&
+      translations[_currLang].containsKey(string))
+    string = translations[_currLang][string];
 
   //Apply arguments
-  if(args != null)
+  if (args != null)
     args.forEach((key, value) => string = string.replaceAll("%$key%", value));
 
   return string;

pubspec.lock

@@ -149,6 +149,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.6.3+4"
+  intl:
+    dependency: "direct main"
+    description:
+      name: intl
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.16.1"
   matcher:
     dependency: transitive
     description:

pubspec.yaml

@@ -48,6 +48,9 @@ dependencies:
   # Module that display the charts for the surveys
   pie_chart: ^3.1.1
 
+  # Get current system language
+  intl: ^0.16.1
+
 dev_dependencies:
   flutter_test:
     sdk: flutter
@@ -65,7 +68,13 @@ flutter:
   uses-material-design: true
 
   # To add assets to your application, add an assets section, like this:
-  # assets:
+  assets:
+
+    # Translations
+    - assets/langs.json
+    - assets/langs/
+
+
   #  - images/a_dot_burr.jpeg
   #  - images/a_dot_ham.jpeg