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inputs: {
  config,
  lib,
  pkgs,
  ...
}:
let
  inherit (inputs.self.lib.theme) fgEscapeCode;
  dominantEscapeCode = fgEscapeCode config.theme.colors.dominant;
in {
  nixpkgs.overlays = [
    (_final: prev: {
      zsh = prev.zsh.overrideAttrs (_old: {
        configureFlags = [
          "--enable-maildir-support"
          "--enable-multibyte"
          "--with-tcsetpgrp"
          "--enable-pcre"
          "--enable-zshenv=/1rz4g4znpzjwh1xymhjpm42vipw92pr73vdgl6xs1hycac8kf2n9/etc/zshenv"
          "--disable-site-fndir"
          # "--enable-function-subdirs"
        ];
      });
    })
  ];

  programs.zsh = {
    enable = true;

    interactiveShellInit = ''
      source "${pkgs.grml-zsh-config}/etc/zsh/zshrc"
      is4 && xsource "${pkgs.grml-zsh-config}/etc/zsh/keephack"

      source "${pkgs.zsh-history-substring-search}/share/zsh-history-substring-search/zsh-history-substring-search.zsh"

      function () {
        local dominant_escape_code="${dominantEscapeCode}"
        local dim_fg_escape_code="${fgEscapeCode config.theme.colors.dimForeground}"

        ${builtins.readFile ../../dotfiles/zshrc}

        autoload -Uz shmart-prompt-dir
        zstyle -e ':prompt:grml*:*:items:path' token shmart-prompt-dir
      }

      # Grml's ZSH config overrides less variables
      export ${lib.concatStringsSep " "
        (lib.mapAttrsToList
          (variable: value: "${variable}=\"${value}\"")
          config.programs.less.envVariables)}
    '';

    # otherwise it'll override the grml prompt
    promptInit = "";
    # Grml handles that, and supports cache (faster!!!)
    enableGlobalCompInit = false;

    syntaxHighlighting = {
      enable = true;
      highlighters = ["main" "brackets" "line"];
    };

    shellAliases = {
      e = "\${(z)EDITOR}";
      # Space at the end makes Zsh expand aliases after "sudo"
      sudo = "sudo ";
    };

    setOptions = [
      "NO_CASE_GLOB"
      "NO_CLOBBER"
    ];
  };

  users.defaultUserShell = pkgs.zsh;

  home-manager.sharedModules = [
    ({config, ...}: {
      programs.zsh = {
        enable = true;
        # Completion is already handled by the GRML conf
        enableCompletion = false;

        history = {
          extended = true;
          expireDuplicatesFirst = true;
          ignoreDups = true;
          ignorePatterns = ["run-help *"];

          # different, for expireDuplicatesFirst
          size = 1100;
          save = 1000;
        };

        # XDG
        dotDir = ".config/zsh";
        history.path = "${config.xdg.dataHome}/zsh/zsh_history";

        plugins = [
          {
            name = "shmart-prompt-dir";
            src = inputs.shmart-prompt-dir;
            file = "none";
          }
        ];
      };
    })
  ];
}