--- a/rust/rhg/src/ui.rs	Thu Aug 13 16:22:15 2020 +0200
+++ b/rust/rhg/src/ui.rs	Wed Sep 09 12:07:05 2020 +0200
@@ -1,3 +1,4 @@
+use std::borrow::Cow;
 use std::io;
 use std::io::{ErrorKind, Write};
 
@@ -103,3 +104,10 @@
     }
     Err(UiError::StdoutError(error))
 }
+
+/// Encode rust strings according to the user system.
+pub fn utf8_to_local(s: &str) -> Cow<[u8]> {
+    // TODO encode for the user's system //
+    let bytes = s.as_bytes();
+    Cow::Borrowed(bytes)
+}