{ pkgs, lib, config, ... }: {
  options = {
    promptSymbol = lib.mkOption {
      type = lib.types.str;
      description = "Prompt prefix symbol.";
    };
  };

  config = {
    users.defaultUserShell = pkgs.fish;

    users.users.nettika = {
      isNormalUser = true;
      extraGroups = [ "wheel" "networkmanager" ];
      openssh.authorizedKeys.keys = [
        "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHopty1QG8P+OfGxQ9CV0BI1IRB/q6yITzMZaZ6Zspid nettika@marauder"
      ];
    };

    nix.settings.trusted-users = [ "@wheel" ];

    security.sudo.wheelNeedsPassword = false;

    networking.networkmanager.enable = true;

    environment.variables.EDITOR = "nano";

    programs.git = {
      enable = true;
      lfs.enable = true;
      config = {
        init.defaultBranch = "master";
        user = {
          email = "git@nettika.cat";
          name = "Nettika";
        };
        credential.helper = "store";
      };
    };

    programs.nano = {
      enable = true;
      nanorc = ''
        set autoindent
        set linenumbers
      '';
    };

    programs.fish = {
      enable = true;
      promptInit = ''
        function fish_prompt
          echo -n '${config.promptSymbol} '
          if fish_is_root_user
            set_color red
          else
            set_color brgreen
          end
          echo -n (prompt_pwd)
          set_color normal
          echo -n ' > '
        end
        function fish_right_prompt
          set_color bryellow
          echo -n (${pkgs.git}/bin/git branch --show-current 2>/dev/null)
        end
      '';
      shellInit = ''
        set -g fish_greeting
        set -g fish_prompt_pwd_full_dirs 999
      '';
    };
  };
}