{
  lib,
  pkgs,
  ...
}:
let
  isLinux = pkgs.stdenv.isLinux;
in
{
  home.packages =
    with pkgs;
    [
      # encryption
      age

      # shell
      shellcheck

      # shell utils
      coreutils
      direnv
      dust
      just
      procs
      ripgrep
      tree
      wget

      # network
      bandwhich

      # data manipulation
      jless
      jq
      yq
    ]
    ++ (lib.optionals (isLinux) [ htop ]);

  # https://github.com/nix-community/home-manager/blob/master/modules/programs/fish.nix
  programs.fish = {
    enable = true;
    interactiveShellInit = ''
      set fish_greeting ""
    '';
    shellAbbrs = {
      ncg = "nix-collect-garbage -7d";
      c = "clear";
      j = "just";
    };
    shellAliases = {
      ls = "eza -l -L=1 --git --color=always --group-directories-first";
      la = "eza -la --git --color=always --group-directories-first";
      ll = "eza -la -L=1 --git --color=always --group-directories-first";
      lt = "eza -aT -L=2 --git --color=always --group-directories-first";
    };
  };

  # https://github.com/nix-community/home-manager/blob/master/modules/programs/starship.nix
  programs.starship = {
    enable = true;
    enableFishIntegration = true;
    enableBashIntegration = true;
    enableZshIntegration = false;
    settings = {
      add_newline = false;
      character = {
        success_symbol = "[λ](bold green)";
        error_symbol = "[λ](bold red)";
      };
      username = {
        show_always = true;
      };
      hostname = {
        ssh_only = true;
      };
      directory = {
        truncation_length = 1;
        truncate_to_repo = false;
        fish_style_pwd_dir_length = 1;
      };
    };
  };

  # an alternative to ls
  programs.eza = {
    enable = true;
    icons = "never";
    enableFishIntegration = false;
    extraOptions = [
      "--group-directories-first"
      "--no-quotes"
      "--git-ignore"
      "--icons=never"
    ];
  };

  # an alternative to find
  programs.fd = {
    enable = true;
    hidden = true;
    ignores = [
      ".git/"
      ".direnv/"
    ];
  };

  programs.direnv = {
    enable = true;
    nix-direnv.enable = true;
    enableZshIntegration = true;
    config = {
      global.disable_stdin = true;
      global.strict_env = true;
    };
  };

  home.sessionVariables = {
    EDITOR = "code --wait";
    HOMEBREW_NO_AUTO_UPDATE = 1;
    LESS = "-FRSXM";
    LESSCHARSET = "utf-8";
    PAGER = "less";
    SHELL = "${pkgs.fish}/bin/fish";
    VISUAL = "code --wait";
  };
}