{ lib, pkgs, ... }:
let
  inherit (builtins)
    concatStringsSep
    ;


  inherit (lib)
    fileContents
    ;

in
{
  users.defaultUserShell = pkgs.zsh;

  environment = {
    sessionVariables = let
      fd = "${pkgs.fd}/bin/fd -H";
    in
    {
      BAT_PAGER = "less";
      SKIM_ALT_C_COMMAND =
        "while read line; do "
        + "line=\"'\${(Q)line}'\"; [[ -d \"'$line'\" ]] && echo \"'$line'\"; "
        + "done < $HOME/.cache/zsh-cdr/recent-dirs";
      SKIM_DEFAULT_COMMAND = fd;
      SKIM_CTRL_T_COMMAND = fd;
    };

    shellAliases = {
      cat = "${pkgs.bat}/bin/bat";

      df = "df -h";
      du = "du -h";

      ls = "${pkgs.exa}/bin/exa";
      l = "ls -lh --git";
      la = "l -a";

      rz = "exec zsh";
    };

    systemPackages = with pkgs; [
      bzip2
      direnv
      gitAndTools.hub
      gzip
      lrzip
      p7zip
      skim
      unrar
      unzip
      zsh-completions
      xz
    ];
  };


  nixpkgs.overlays = let
    purs = self: super:
    { purs = super.callPackage ../../../pkgs/shells/zsh/purs {}; };
  in
  [ purs ];


  programs.zsh = {
    enable = true;

    promptInit = ''
      source ${pkgs.purs}/share/zsh/plugins/purs/purs.zsh
    '';

    interactiveShellInit = let
      zshrc = fileContents ./zshrc;

      paths = with pkgs; [
        "${skim}/share/skim/completion.zsh"
        "${oh-my-zsh}/share/oh-my-zsh/plugins/sudo/sudo.plugin.zsh"
        "${oh-my-zsh}/share/oh-my-zsh/plugins/extract/extract.plugin.zsh"
        "${zsh-syntax-highlighting}/share/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh"
        "${zsh-history-substring-search}/share/zsh-history-substring-search/zsh-history-substring-search.zsh"
      ];

      source = map
        (source: "source " + source)
        paths;

      plugins = concatStringsSep "\n"
      (
        [
          "${pkgs.any-nix-shell}/bin/any-nix-shell zsh --info-right | source /dev/stdin"
        ] ++
        source
      );



    in
      ''
        ${plugins}

        ${zshrc}

        source ${pkgs.skim}/share/skim/key-bindings.zsh
      '';
  };
}