diff --git a/lib/i18n.js b/lib/i18n.js
new file mode 100644
index 00000000..bf1e1cb0
--- /dev/null
+++ b/lib/i18n.js
@@ -0,0 +1,109 @@
+const _ = require('lodash');
+const util = require('hexo-util');
+const RFC5646_TAGS = require('./rfc5646');
+
+const Pattern = util.Pattern;
+
+module.exports = function (hexo) {
+    function pathJoin(...paths) {
+        return paths.join('/');
+    }
+
+    function formatRfc5646(language) {
+        if (!language) {
+            return '';
+        }
+        return language.split(/[-_]/).map((l, i) => i === 0 ? l.toLowerCase() : l.toUpperCase()).join('-');
+    }
+
+    function formatIso639(language) {
+        if (!language) {
+            return '';
+        }
+        return language.split(/[-_]/)[0].toLowerCase();
+    }
+
+    function getClosestRfc5646WithCountryCode(language) {
+        if (!language) {
+            return '';
+        }
+        const iso639 = formatRfc5646(language).split('-')[0];
+        const result = Object.keys(RFC5646_TAGS).find(tag => tag.startsWith(iso639 + '-'));
+        return result ? result : iso639;
+    }
+
+    function getUsedLanguages() {
+        return hexo.theme.i18n.list();
+    }
+
+    function getDisplayLanguages() {
+        let languages = hexo.config.language;
+        if (!languages) {
+            return ['default'];
+        }
+        languages = [].concat(hexo.config.language);
+        if (!Array.isArray(languages)) {
+            languages = [languages];
+        }
+        if (languages.indexOf('default') > -1) {
+            languages.splice(languages.indexOf('default'), 1);
+        }
+        return languages;
+    }
+
+    function isLanguageValid(language) {
+        const variants = [language, formatRfc5646(language)];
+        return variants.some(variant => RFC5646_TAGS.hasOwnProperty(variant));
+    }
+
+    function injectLanguages(func) {
+        return function(locals) {
+            return func.call(this, getDisplayLanguages(), locals);
+        }
+    }
+
+    function getPageLanguage(post) {
+        const languages = getUsedLanguages();
+        let lang = post.lang || post.language;
+        if (!lang && post.source) {
+            const path = post.source.startsWith('_posts/') ? post.source.slice('_posts/'.length) : post.source;
+            const pattern = new Pattern(`${hexo.config.i18n_dir}/*path`);
+            const data = pattern.match(path);
+
+            if (data && data.lang && ~languages.indexOf(data.lang)) {
+                lang = data.lang;
+            }
+        }
+        return lang;
+    }
+
+    function isDefaultLanguage(language) {
+        return !language || getDisplayLanguages().indexOf(language) === 0;
+    }
+
+    function postFilter(language) {
+        return function (post) {
+            let lang = getPageLanguage(post);
+            return lang === language || (isDefaultLanguage(language) && !lang);
+        }
+    }
+
+    function url_for(path) {
+        return hexo.extend.helper.get('url_for').call(hexo, path);
+    }
+
+    return {
+        pathJoin,
+        isDefaultLanguage,
+        url_for,
+        postFilter,
+        injectLanguages,
+        getUsedLanguages,
+        getDisplayLanguages,
+        getPageLanguage,
+        isLanguageValid,
+        formatRfc5646,
+        formatIso639,
+        getClosestRfc5646WithCountryCode
+    };
+};
\ No newline at end of file
diff --git a/scripts/rfc5646.js b/lib/rfc5646.js
similarity index 100%
rename from scripts/rfc5646.js
rename to lib/rfc5646.js
diff --git a/scripts/01_check.js b/scripts/01_check.js
index 605b1c32..28f4c170 100644
--- a/scripts/01_check.js
+++ b/scripts/01_check.js
@@ -50,7 +50,7 @@ if (!fs.existsSync(mainConfigPath)) {
     logger.warn(`${mainConfigPath} is not found. Please create one from the template _config.yml.example.`)
 }
 
-const { getUsedLanguages, getDisplayLanguages, isLanguageValid } = require('./10_i18n');
+const { getUsedLanguages, getDisplayLanguages, isLanguageValid } = require('../lib/i18n')(hexo);
 
 logger.info('Checking language names against RFC5646 specs');
 const invalidLanguages = getUsedLanguages().filter(language => !isLanguageValid(language));
diff --git a/scripts/10_i18n.js b/scripts/10_i18n.js
index 940bc358..5242e724 100644
--- a/scripts/10_i18n.js
+++ b/scripts/10_i18n.js
@@ -5,97 +5,20 @@ const indexGenerator = require('hexo-generator-index/lib/generator');
 const archiveGenerator = require('hexo-generator-archive/lib/generator');
 const categoryGenerator = require('hexo-generator-category/lib/generator');
 const tagGenerator = require('hexo-generator-tag/lib/generator');
-
-const RFC5646_TAGS = require('./rfc5646');
-
-const Pattern = util.Pattern;
-
-function pathJoin(...paths) {
-    return paths.join('/');
-}
-
-function formatRfc5646(language) {
-    if (!language) {
-        return '';
-    }
-    return language.split(/[-_]/).map((l, i) => i === 0 ? l.toLowerCase() : l.toUpperCase()).join('-');
-}
-
-function formatIso639(language) {
-    if (!language) {
-        return '';
-    }
-    return language.split(/[-_]/)[0].toLowerCase();
-}
-
-function getClosestRfc5646WithCountryCode(language) {
-    if (!language) {
-        return '';
-    }
-    const iso639 = formatRfc5646(language).split('-')[0];
-    const result = Object.keys(RFC5646_TAGS).find(tag => tag.startsWith(iso639 + '-'));
-    return result ? result : iso639;
-}
-
-function getUsedLanguages() {
-    return hexo.theme.i18n.list();
-}
-
-function getDisplayLanguages() {
-    let languages = hexo.config.language;
-    if (!languages) {
-        return ['default'];
-    }
-    languages = [].concat(hexo.config.language);
-    if (!Array.isArray(languages)) {
-        languages = [languages];
-    }
-    if (languages.indexOf('default') > -1) {
-        languages.splice(languages.indexOf('default'), 1);
-    }
-    return languages;
-}
-
-function isLanguageValid(language) {
-    const variants = [language, formatRfc5646(language)];
-    return variants.some(variant => RFC5646_TAGS.hasOwnProperty(variant));
-}
-
-function injectLanguages(func) {
-    return function(locals) {
-        return func.call(this, getDisplayLanguages(), locals);
-    }
-}
-
-function getPageLanguage(post) {
-    const languages = getUsedLanguages();
-    let lang = post.lang || post.language;
-    if (!lang && post.source) {
-        const path = post.source.startsWith('_posts/') ? post.source.slice('_posts/'.length) : post.source;
-        const pattern = new Pattern(`${hexo.config.i18n_dir}/*path`);
-        const data = pattern.match(path);
-
-        if (data && data.lang && ~languages.indexOf(data.lang)) {
-            lang = data.lang;
-        }
-    }
-    return lang;
-}
-
-function isDefaultLanguage(language) {
-    return !language || getDisplayLanguages().indexOf(language) === 0;
-}
-
-function postFilter(language) {
-    return function (post) {
-        let lang = getPageLanguage(post);
-        return lang === language || (isDefaultLanguage(language) && !lang);
-    }
-}
-
-function url_for(path) {
-    return hexo.extend.helper.get('url_for').call(hexo, path);
-}
+const {
+    pathJoin,
+    isDefaultLanguage,
+    url_for,
+    postFilter,
+    injectLanguages,
+    getUsedLanguages,
+    getDisplayLanguages,
+    getPageLanguage,
+    isLanguageValid,
+    formatRfc5646,
+    formatIso639,
+    getClosestRfc5646WithCountryCode
+} = require('../lib/i18n')(hexo);
 
 /**
  * Modify previous and next post link
@@ -443,14 +366,4 @@ hexo.extend.helper.register('closest_rfc5646_with_country_code', function (langu
 hexo.extend.helper.register('language_name', function (language) {
     const name = hexo.theme.i18n.__(language)('name');
     return name === 'name' ? language : name;
-});
-
-module.exports = {
-    getUsedLanguages,
-    getDisplayLanguages,
-    getPageLanguage,
-    isLanguageValid,
-    formatRfc5646,
-    formatIso639,
-    getClosestRfc5646WithCountryCode
-};
\ No newline at end of file
+});
\ No newline at end of file
diff --git a/scripts/99_content.js b/scripts/99_content.js
index 655f18a8..09ec1bc1 100644
--- a/scripts/99_content.js
+++ b/scripts/99_content.js
@@ -1,7 +1,7 @@
 const _ = require('lodash');
 const moment = require('moment');
 const cheerio = require('cheerio');
-const { formatRfc5646, formatIso639, getClosestRfc5646WithCountryCode, getPageLanguage } = require('./10_i18n');
+const { formatRfc5646, formatIso639, getClosestRfc5646WithCountryCode, getPageLanguage } = require('../lib/i18n')(hexo);
 
 const MOMENTJS_SUPPORTED_LANGUAGES = ['af', 'ar-dz', 'ar-kw', 'ar-ly', 'ar-ma', 'ar-sa',
     'ar-tn', 'ar', 'az', 'be', 'bg', 'bm', 'bn', 'bo', 'br', 'bs', 'ca', 'cs', 'cv', 'cy',