{ pkgs, lib, ... }:
let
  isDarwin = lib.strings.hasSuffix "darwin" pkgs.system;
in
{
  environment.systemPackages = [
    pkgs.htop
    pkgs.btop
    pkgs.iftop
    pkgs.lsof

    pkgs.wget
    pkgs.curl

    pkgs.zip
    pkgs.unzip
    pkgs.unrar
    pkgs.p7zip

    pkgs.fd
    pkgs.ripgrep
    pkgs.bat
    pkgs.findutils
    pkgs.coreutils
    pkgs.tree

    pkgs.rlwrap

    pkgs.file
    pkgs.progress
    pkgs.gdu
    pkgs.rmlint

    pkgs.binutils # for objdump, strings, etc.
    pkgs.gnumake # for make
    pkgs.tokei # for code statistics

    pkgs.man-pages
    pkgs.man-pages-posix
    pkgs.dos2unix

    pkgs.whois
    pkgs.dnsutils
    pkgs.aria2

    pkgs.jq
    pkgs.yq
    pkgs.bc

    pkgs.vimv

    pkgs.pciutils # for lspci

    pkgs.tmux
  ]
  ++ lib.optionals (!isDarwin) [
    pkgs.usbutils # for lsusb
    pkgs.lshw
    pkgs.iotop
    pkgs.psmisc # killall, pstree
  ];

  security.wrappers = {
    pmount = {
      setuid = true;
      owner = "root";
      group = "root";
      source = "${pkgs.pmount}/bin/pmount";
    };
    pumount = {
      setuid = true;
      owner = "root";
      group = "root";
      source = "${pkgs.pmount}/bin/pumount";
    };
  };

  environment.interactiveShellInit = ''
    # Use XDG_RUNTIME_DIR for temporary files if available
    if [ -d "$XDG_RUNTIME_DIR" ]; then
      export TMPDIR="$XDG_RUNTIME_DIR"
    fi
  '';

  environment.shellAliases =
    let
      take = pkgs.writers.writeDash "take" ''
        mkdir "$1" && cd "$1"
      '';
      cdt = pkgs.writers.writeDash "cdt" ''
        cd $(mktemp -p "$XDG_RUNTIME_DIR" -d "cdt-XXXXXX")
        pwd
      '';
      wcd = pkgs.writers.writeDash "wcd" ''
        cd "$(readlink "$(${pkgs.which}/bin/which --skip-alias "$1")" | xargs dirname)/.."
      '';
      where = pkgs.writers.writeDash "where" ''
        readlink "$(${pkgs.which}/bin/which --skip-alias "$1")" | xargs dirname
      '';
    in
    {
      nixi = "nix repl nixpkgs";
      take = "source ${take}";
      wcd = "source ${wcd}";
      where = "source ${where}";
      # temporary files and directories
      cdt = "source ${cdt}";
      vit = "$EDITOR $(mktemp)";
      # file safety
      mv = "${pkgs.coreutils}/bin/mv --interactive";
      rm = "${pkgs.coreutils}/bin/rm --interactive --verbose";
      cp = "${pkgs.coreutils}/bin/cp --interactive";
      # colours
      cat = "${pkgs.bat}/bin/bat --theme=ansi --style=plain";
      l = "${pkgs.coreutils}/bin/ls --color=auto --time-style=long-iso --almost-all";
      ls = "${pkgs.coreutils}/bin/ls --color=auto --time-style=long-iso";
      ll = "${pkgs.coreutils}/bin/ls --color=auto --time-style=long-iso -l";
      la = "${pkgs.coreutils}/bin/ls --color=auto --time-style=long-iso --almost-all -l";

      o = "${pkgs.xdg-utils}/bin/xdg-open";
      ns = "nix-shell --run zsh";
    }
    // (
      if isDarwin then
        { }
      else
        {
          "ß" = "${pkgs.util-linux}/bin/setsid";
          ip = "${pkgs.iproute2}/bin/ip -c";
          # systemd
          s = "${pkgs.systemd}/bin/systemctl";
          us = "${pkgs.systemd}/bin/systemctl --user";
          j = "${pkgs.systemd}/bin/journalctl";
          uj = "${pkgs.systemd}/bin/journalctl --user";
        }
    );

  programs.tmux = {
    enable = true;
    keyMode = "vi";
    clock24 = true;
    terminal = "screen-256color";
    baseIndex = 1;
    aggressiveResize = true;
    escapeTime = 50;
    historyLimit = 7000;
    shortcut = "b";
    extraConfig = ''
      set -g mouse on

      unbind *
      bind * list-clients

      # naVIgate
      bind h select-pane -L
      bind j select-pane -D
      bind k select-pane -U
      bind l select-pane -R

      # Use C-h and C-l to cycle through panes
      bind -r C-h select-window -t :-
      bind -r C-l select-window -t :+

      setw -g monitor-activity on
      set -g visual-activity on

      set -g status-interval 2
      set -g status-left-length 32
      set -g status-right-length 150

      set -g status-position bottom
    '';
  };
}