1 files changed, 19 insertions, 0 deletions
diff --git a/packages/gitbook-markdown/lib/utils/lang.js b/packages/gitbook-markdown/lib/utils/lang.js
new file mode 100644
index 0000000..9da737b
--- /dev/null
+++ b/packages/gitbook-markdown/lib/utils/lang.js
@@ -0,0 +1,19 @@
+var MAP = {
+    'py': 'python',
+    'js': 'javascript',
+    'rb': 'ruby',
+    'csharp': 'cs',
+};
+
+function normalize(lang) {
+    if(!lang) { return null; }
+
+    var lower = lang.toLowerCase();
+    return MAP[lower] || lower;
+}
+
+// Exports
+module.exports = {
+    normalize: normalize,
+    MAP: MAP
+};