{
  lib,
  pkgs,
  ...
}:
let
  zshSourceCommon = ./zsh/common;

  isDarwin = pkgs.stdenv.hostPlatform.isDarwin;
  isLinux = pkgs.stdenv.hostPlatform.isLinux;
in
{

  # Let Home Manager install and manage itself.
  programs.home-manager.enable = true;

  programs.bat = {
    enable = true;
  };

  programs.zsh = {
    enable = true;

    autocd = lib.mkDefault true;

    shellAliases =
      {
        cat = lib.mkDefault "bat --paging=never";
        nixfix = lib.mkDefault "nix fmt ./**/*.nix";
      }
      // (
        if isDarwin then
          {
            hm-switch = lib.mkDefault "darwin-rebuild switch --flake ~/.config/nix";
          }
        else if isLinux then
          {
            hm-switch = lib.mkDefault "home-manager switch --flake ~/.config/nix";
          }
        else
          { }
      );

    initExtra = lib.mkBefore ''
      for file in ${zshSourceCommon}/*.zsh; do
          source "$file"
      done

      # [Ctrl-RightArrow] - move forward one word
      bindkey '^[[1;3C' forward-word
      # [Ctrl-LeftArrow] - move backward one word
      bindkey '^[[1;3D' backward-word
    '';
  };

  programs.starship = {
    enable = true;
    enableZshIntegration = true;

    settings = {
      format = lib.concatStrings [
        "$username"
        "$hostname"
        "$directory"
        "$character"
      ];
      right_format = lib.concatStrings [
        "$git_branch"
        "$git_commit"
        "$git_state"
        "$git_metrics"
        "$git_status"
        "($cmd_duration)"
      ];
      scan_timeout = 25;
      add_newline = false;
      continuation_prompt = "[▸▹ ](dimmed white)";
      follow_symlinks = false;
      directory = {
        truncate_to_repo = false;
        truncation_length = 20;
        truncation_symbol = "…/";
      };

      cmd_duration = {
        min_time = 100;
        show_milliseconds = true;
        format = "took [$duration]($style) ";
        style = "bold yellow";
      };

      character = {
        success_symbol = "[›](bold green)";
        error_symbol = "[›](bold red)";
      };
    };
  };
}