1 files changed, 23 insertions, 0 deletions
diff --git a/src/lib/languageMap.ts b/src/lib/languageMap.ts
new file mode 100644
index 0000000..ec8d6b7
--- /dev/null
+++ b/src/lib/languageMap.ts
@@ -0,0 +1,23 @@
+import type { Language } from '@/types'
+
+const extensionMap: Record<string, Language> = {
+  ts: 'typescript',
+  tsx: 'typescript',
+  js: 'javascript',
+  jsx: 'javascript',
+  mjs: 'javascript',
+  cjs: 'javascript',
+  rs: 'rust',
+  json: 'json',
+  md: 'markdown',
+  mdx: 'markdown',
+  html: 'html',
+  htm: 'html',
+  css: 'css',
+  py: 'python',
+}
+
+export function detectLanguage(filename: string): Language {
+  const ext = filename.split('.').pop()?.toLowerCase() ?? ''
+  return extensionMap[ext] ?? 'plaintext'
+}