add helix and nu config

devshell.nix

@@ -1,4 +1,24 @@
 { pkgs }:
+let
+  helix-config = pkgs.writeText "helix.conf" ''
+    [editor.cursor-shape]
+    insert = "bar"
+    normal = "block"
+    select = "underline"
+
+    [editor.indent-guides]
+    render = true
+    character = "╎" # Some characters that work well: "▏", "┆", "┊", "⸽"
+    skip-levels = 1
+  '';
+
+  nu-config = pkgs.writeText "nu.conf" ''
+    $env.config = {
+      show_banner: false,
+    }
+    alias "hx" = hx -c ${helix-config}
+  '';
+in
 pkgs.mkShell {
   # Add build dependencies
   packages = with pkgs; [
@@ -25,7 +45,7 @@ pkgs.mkShell {
 
   # Load custom bash code
   shellHook = ''
-    nu
+    nu --config ${nu-config}
     exit 0
   '';
 }