Start adding i18n

index.js

-module.exports = function defaultTheme(output) {
+var _ = require('lodash');
+var path = require('path');
+var fs = require('fs');
+var i18n = require('i18n');
 
+// Root folder for i18n locales
+var I18N_PATH = path.resolve(__dirname, '../_i18n/');
 
+// Default language is english
+var DEFAULT_LANGUAGE = 'en';
+
+// List all locales
+var LOCALES = _.map(fs.readdirSync(I18N_PATH), function(lang) {
+    return path.basename(lang, '.json');
+});
+
+// Configure i18n
+i18n.configure({
+    locales: LOCALES,
+    directory: I18N_PATH,
+    defaultLocale: DEFAULT_LANGUAGE,
+    updateFiles: false
+});
+
+function compareLocales(lang, locale) {
+    var langMain = _.first(lang.split('-'));
+    var langSecond = _.last(lang.split('-'));
+
+    var localeMain = _.first(locale.split('-'));
+    var localeSecond = _.last(locale.split('-'));
+
+    if (locale == lang) return 100;
+    if (localeMain == langMain) return 50;
+    if (localeSecond == langSecond) return 20;
+    return 0;
+}
+
+var normalizeLanguage = _.memoize(function(lang) {
+    var language = _.chain(LOCALES)
+        .values()
+        .map(function(locale) {
+            return {
+                locale: locale,
+                score: compareLocales(lang, locale)
+            };
+        })
+        .filter(function(lang) {
+            return lang.score > 0;
+        })
+        .sortBy('score')
+        .pluck('locale')
+        .last()
+        .value();
+    return language || lang;
+});
+
+function translate(locale, phrase) {
+    var args = Array.prototype.slice.call(arguments, 2);
+
+    return i18n.__.apply({}, [{
+        locale: locale,
+        phrase: phrase
+    }].concat(args));
+}
+
+function getCatalog(locale) {
+    locale = normalizeLanguage(locale);
+    return i18n.getCatalog(locale);
+}
+
+function getLocales() {
+    return LOCALES;
+}
+
+function hasLocale(locale) {
+    return _.contains(LOCALES, locale);
+}
+
+module.exports = {
+    filters: {
+
+    }
 };
 

package.json

@@ -5,6 +5,9 @@
     "engines": {
         "gitbook": ">=3.0.0"
     },
+    "dependencies": {
+        "i18n": "0.7.0"
+    },
     "devDependencies": {
         "less": "2.6.0",
         "less-plugin-clean-css": "1.5.1",