home/i3status-rust: add kbd cycle script on click

home/i3status-rust.nix

@@ -1,4 +1,14 @@
-{ ... }:
+{ pkgs, ... }:
+let
+  kbd_switch = pkgs.writeShellScriptBin "kbd_switch" ''
+    declare -A -r KBD_CYCLE_MAP=(
+      ["English (US)"]="de"
+      ["German"]="ba"
+    )
+    LAYOUT="$(${pkgs.sway}/bin/swaymsg -t get_inputs -r | ${pkgs.jq}/bin/jq -r 'map(select(.type == "keyboard")).[0].xkb_layout_names.[]')"
+    swaymsg input "*" xkb_layout ''${KBD_CYCLE_MAP["$LAYOUT"]:-"us"}
+  '';
+in
 {
   programs.i3status-rust = {
     bars.top = {
@@ -15,6 +25,12 @@
         {
           block = "keyboard_layout";
           driver = "sway";
+          click = [
+            {
+              cmd = "${kbd_switch}/bin/kbd_switch";
+              button = "left";
+            }
+          ];
         }
         {
           block = "battery";