Add locale support (#228)

src/middleware.ts

@@ -0,0 +1,22 @@
+import { NextRequest, NextResponse } from "next/server";
+
+export function middleware({ headers, cookies, nextUrl }: NextRequest) {
+  const locale =
+    cookies.get("NEXT_LOCALE") ??
+    (headers
+      .get("accept-language")
+      ?.split(",")?.[0]
+      .split("-")?.[0]
+      .toLowerCase() ||
+      "en");
+
+  const newUrl = nextUrl.clone();
+  newUrl.pathname = `/${locale}${newUrl.pathname}`;
+
+  return NextResponse.rewrite(newUrl);
+}
+
+export const config = {
+  // these are paths we should rewrite to prev
+  matcher: ["/admin/:id", "/demo", "/p/:id", "/profile", "/new"],
+};