{config, lib, pkgs, ...}:
let
  # A list is used because it preserves ordering
  tags = [
    { name = "tag 1"; key = "something"; }
    { name = "tag 2"; }
  ];
  # Attribute set of { <keybind> = "use <tag>"; }
  keybinds = let
    tagsWithKeybinds = lib.filter (lib.hasAttr "key") tags;
  in lib.listToAttrs (map (x: lib.nameValuePair x.key "use ${x.name}") tagsWithKeybinds);
in
{
  xsession.windowManager.herbstluftwm.enable = true;
  xsession.windowManager.herbstluftwm.keybinds = keybinds;
  xsession.windowManager.herbstluftwm.tags = lib.catAttrs "name" tags;
}