{
  system =
    {
      config,
      pkgs,
      lib,
      ...
    }:
    with lib;
    mkMerge [
      {
        users.users = mapAttrs (
          _: val:
          mkIf val.kat.zsh {
            shell = pkgs.zsh;
          }
        ) config.home-manager.users;
      }
      (mkIf (any (val: val.kat.zsh) (attrValues config.home-manager.users)) {
        programs.zsh.enable = true;
      })
    ];
  user =
    {
      config,
      pkgs,
      lib,
      ...
    }:
    with lib;
    {
      options.kat.zsh = mkEnableOption "zsh configuration" // {
        default = true;
      };
      config = mkIf config.kat.zsh {
        programs = {
          zsh = {
            enable = true;
            oh-my-zsh = {
              enable = true;
              plugins = [ "git" ];
            };
            plugins = [
              {
                name = "zsh-nix-shell";
                file = "nix-shell.plugin.zsh";
                src = pkgs.fetchFromGitHub {
                  owner = "chisui";
                  repo = "zsh-nix-shell";
                  rev = "v0.8.0";
                  sha256 = "1lzrn0n4fxfcgg65v0qhnj7wnybybqzs4adz7xsrkgmcsr0ii8b7";
                };
              }
              {
                name = "zsh-autosuggestion";
                file = "zsh-autosuggestions.zsh";
                src = pkgs.fetchFromGitHub {
                  owner = "zsh-users";
                  repo = "zsh-autosuggestions";
                  rev = "v0.7.0";
                  sha256 = "1g3pij5qn2j7v7jjac2a63lxd97mcsgw6xq6k5p7835q9fjiid98";
                };
              }
              {
                name = "zsh-syntax-highlighting";
                file = "zsh-syntax-highlighting.zsh";
                src = pkgs.fetchFromGitHub {
                  owner = "zsh-users";
                  repo = "zsh-syntax-highlighting";
                  rev = "0.8.0";
                  sha256 = "1yl8zdip1z9inp280sfa5byjbf2vqh2iazsycar987khjsi5d5w8";
                };
              }
            ];
          };

          starship = {
            enable = true;
            enableZshIntegration = true;
            settings.battery.disabled = true;
          };

          direnv = {
            enable = true;
            enableZshIntegration = true;
            nix-direnv.enable = true;
          };
        };
      };
    };
}