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inputs:
{
  config,
  lib,
  pkgs,
  ...
}:
let
  inherit (inputs.self.lib.theme) fgEscapeCode;
  dominantEscapeCode = fgEscapeCode config.theme.colors.dominant;
in
{
  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;

    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";
            }

            {
              name = "fast-syntax-highlighting";
              src = "${pkgs.unstable.zsh-fast-syntax-highlighting}/share/zsh/site-functions";
            }
          ];
        };
      }
    )
  ];
}