v2: prepare to move

v2/lib/load/env.js

@@ -0,0 +1,60 @@
+const fs = require('fs-extra');
+const path = require('path');
+const {idx} = require('./utils');
+
+module.exports = function loadEnv({siteDir, siteConfig}) {
+  // Translation
+  const translation = {
+    enabled: false,
+    enabledLanguages: [],
+    defaultLanguage: {}
+  };
+
+  const languagesFile = path.join(siteDir, 'languages.js');
+  if (fs.existsSync(languagesFile)) {
+    const languages = require(languagesFile); // eslint-disable-line
+
+    /* Enabled languages */
+    const enabledLanguages = languages.filter(lang => lang.enabled);
+    if (!enabledLanguages || enabledLanguages.length === 0) {
+      throw new Error(`Please at least enable one language in 'languages.js'`);
+    }
+    translation.enabledLanguages = enabledLanguages;
+
+    /* Default Language */
+    const {defaultLanguage: defaultLanguageTag} = siteConfig;
+    const defaultLanguage = enabledLanguages.find(
+      lang => lang.tag === defaultLanguageTag
+    );
+    if (!defaultLanguage) {
+      throw new Error(
+        `Please set a default language in 'siteConfig.js' which is enabled in 'languages.js'`
+      );
+    }
+    translation.defaultLanguage = defaultLanguage;
+
+    translation.enabled = true;
+  }
+
+  // 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 = idx(versioning, ['versions', 0]);
+    const {defaultVersionShown} = siteConfig;
+    versioning.defaultVersion = defaultVersionShown || versioning.latestVersion;
+  }
+
+  return {
+    translation,
+    versioning
+  };
+};