first try

modules/home/editor/helix-config.nix

@@ -0,0 +1,26 @@
+{
+  theme = "rosepine";
+
+  editor = {
+    line-number = "relative";
+    cursorline = true;
+    auto-format = true;
+    soft-wrap.enable = true;
+
+    whitespace.render = "all";
+
+    cursor-shape = {
+      insert = "bar";
+      normal = "block";
+      select = "underline";
+    };
+
+  };
+
+  keys.normal  = {
+    h = "move_char_left";
+    t = "move_line_up";
+    n = "move_line_down";
+    s = "move_char_right";
+  };
+}