found a better way

home/i3status.nix

@@ -1,7 +1,7 @@
 { config, pkgs, lib, ... }:
 let
-  inherit (builtins) map genList listToAttrs;
-  inherit (lib.lists) length imap0 forEach reverseList elemAt;
+  inherit (builtins) listToAttrs;
+  inherit (lib.lists) imap1 forEach reverseList elemAt;
   modules = [
     {
       name = "time";
@@ -53,13 +53,9 @@ let
       };
     }
   ];
-  modulesLength = length modules;
-  modPositions = map (x:
-    { position = x; }
-  ) (reverseList (genList (x: x+1) modulesLength));
-  numberedModulesList = imap0 (i: v:
-    (elemAt modules i) // v
-  ) modPositions;
+  numberedModulesList = imap1 (i: v:
+    v // { position = i; }
+  ) (reverseList modules);
   modNameValList = forEach numberedModulesList (x: {
     name = x.name;
     value = {
@@ -80,7 +76,7 @@ in
       color_good = "#00FF00";
       color_degraded = "#00FFFF";
       color_bad = "#FF0000";
-      separator = "][";
+      separator = "｜";
     };
     modules = modAttr;
   };