Enable sub-directories in docs/ (#705)

lib/server/utils.js

@@ -0,0 +1,46 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+const path = require('path');
+const escapeStringRegexp = require('escape-string-regexp');
+const env = require('./env.js');
+
+// Return the subdirectory path from a reference directory
+// Example:
+//  (file: 'docs/projectA/test.md', refDir: 'subDir')
+//  returns 'projectA'
+function getSubDir(file, refDir) {
+  let subDir = path.dirname(path.relative(refDir, file));
+  subDir = subDir.replace('\\', '/');
+  return subDir !== '.' ? subDir : null;
+}
+
+// Get the corresponding enabled language locale of a file.
+// Example:
+//  (file: '/website/translated_docs/ko/projectA/test.md', refDir: 'website/translated_docs')
+//  returns 'ko'
+function getLanguage(file, refDir) {
+  let regexSubFolder = new RegExp(
+    '/' + escapeStringRegexp(path.basename(refDir)) + '/(.*)/.*/'
+  );
+  const match = regexSubFolder.exec(file);
+
+  // Avoid misinterpreting subdirectory as language
+  if (match && env.translation.enabled) {
+    const enabledLanguages = env.translation
+      .enabledLanguages()
+      .map(language => language.tag);
+    if (enabledLanguages.indexOf(match[1]) !== -1) {
+      return match[1];
+    }
+  }
+  return null;
+}
+
+module.exports = {
+  getSubDir,
+  getLanguage,
+};