feat: add loadEnv to check if translation / versioning is enabled

lib/load/env.js

@@ -0,0 +1,39 @@
+const fs = require('fs-extra');
+const path = require('path');
+
+module.exports = function loadEnv({siteDir, siteConfig}) {
+  // Translation
+  const translation = {
+    enabled: false,
+    enabledLanguages: []
+  };
+
+  const languagesFile = path.join(siteDir, 'languages.js');
+  if (fs.existsSync(languagesFile)) {
+    translation.enabled = true;
+    const languages = require(languagesFile);
+    translation.enabledLanguages = languages.filter(lang => lang.enabled);
+  }
+
+  // Versioning
+  const versioning = {
+    enabled: false,
+    latestVersion: null,
+    defaultVersion: null,
+    versions: []
+  };
+
+  const versionsJSONFile = path.join(siteDir, 'versions.json');
+  if (fs.existsSync(versionsJSONFile)) {
+    versioning.enabled = true;
+    versioning.versions = JSON.parse(fs.readFileSync(versionsJSONFile, 'utf8'));
+    versioning.latestVersion = versioning.versions[0];
+    const {defaultVersionShown} = siteConfig;
+    versioning.defaultVersion = defaultVersionShown || versioning.latestVersion;
+  }
+
+  return {
+    translation,
+    versioning
+  };
+};