{ config, pkgs, ... }:
let isLinux = pkgs.stdenv.isLinux;
in {
  home.packages = with pkgs;
    [
      # shell
      shellcheck

      # shell utils
      coreutils
      direnv
      dust
      procs
      ripgrep
      tree
      wget

      # network
      bandwhich

      # data manipulation
      jless
      jq
      yq

      # dicts
      aspell
      aspellDicts.en
      aspellDicts.en-computers
      aspellDicts.en-science
    ] ++ (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 -d";
      c = "clear";
    };
    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";
    };
  };

  # 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 = {
    ASPELL_CONF = "conf ${config.xdg.configHome}/aspell/config;";
    EDITOR = "emacsclient -a=";
    HOMEBREW_NO_AUTO_UPDATE = 1;
    LESS = "-FRSXM";
    LESSCHARSET = "utf-8";
    PAGER = "less";
    SHELL = "${pkgs.fish}/bin/fish";
    VISUAL = "emacsclient -a=";
  };
}