add locale-utils

src/lib/util/locale-utils.js

@@ -0,0 +1,36 @@
+const fs = require('fs');
+
+const helpers = require('./helpers');
+
+/**
+ * List locales dirents
+ */
+function listLocaleDirents() {
+  const allDirents = fs.readdirSync(helpers.root('resource/locales'), { withFileTypes: true });
+  return allDirents
+    .filter(dirent => dirent.isDirectory());
+}
+
+/**
+ * List locales IDs (=subdir names)
+ */
+function listLocaleIds() {
+  return listLocaleDirents()
+    .map(dir => dir.name);
+}
+
+/**
+ * List locales aliases
+ */
+function listLocaleAliases() {
+  return listLocaleIds()
+    .map(localeId => require(`@root/resource/locales/${localeId}/_conf.json`))
+    .filter(meta => meta.aliases != null)
+    .map(meta => meta.aliases)
+    .flat();
+}
+
+module.exports = {
+  listLocaleIds,
+  listLocaleAliases,
+};