{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;
        keybinds = ''
          Mod4-Control-h     = "resize left +0.02"
          Mod4-Control-j     = "resize down +0.02"
          Mod4-Control-k     = "resize up +0.02"
          Mod4-Control-l     = "resize right +0.02"
          Mod4-Control-Left  = "resize left +0.02"
          Mod4-Control-Down  = "resize down +0.02"
          Mod4-Control-Up    = "resize up +0.02"
          Mod4-Control-Right = "resize right +0.02"
        '';
        tags = lib.catAttrs "name" tags;
      };
    };
  };
}