{ pkgs, treefmt }:
let
  dictionary = [
    "Asahi"
    "LLMs"
    "LTeX"
    "NixOS"
  ];
  tomlFormatter = pkgs.formats.toml { };
  valeDictionary = {
    directory = "./.vale/styles/config/vocabularies/General";
    filename = "accept.txt";
    content = builtins.concatStringsSep "\n" dictionary;
    file = builtins.toFile valeDictionary.filename valeDictionary.content;
  };
  typosConfig = {
    default.extendWords = builtins.listToAttrs (
      builtins.map (x: {
        name = x;
        value = x;
      }) dictionary
    );
  };
  typosConfigFile = tomlFormatter.generate "_typos.toml" typosConfig;
in
{
  helix.language-server = {
    # https://ltex-plus.github.io/ltex-plus/supported-languages.html
    ltex-ls-plus = {
      command = "${pkgs.ltex-ls-plus}/bin/ltex-ls-plus";
      config.ltex.dictionary.en-US = dictionary;
    };
    # https://vale.sh/docs/formats/code
    vale-ls.command = "${pkgs.vale-ls}/bin/vale-ls";
    # https://writewithharper.com/docs/integrations/language-server#Supported-Languages
    harper-ls.command = "${pkgs.harper}/bin/harper-ls";
  };
  treefmt.programs.typos = {
    enable = true;
    locale = "en-us";
    configFile = typosConfigFile.outPath;
  };
  devshell = {
    commands = [
      {
        help = "sync vale configuration";
        name = "vale-sync";
        command = "${pkgs.vale}/bin/vale sync";
      }
    ];
    packages = [ pkgs.vale ];
    devshellStartup = {
      vale_config.text = ''
        mkdir -p ${valeDictionary.directory}
        ${pkgs.uutils-coreutils-noprefix}/bin/ln -fs ${valeDictionary.file} ${valeDictionary.directory}/${valeDictionary.filename}
      '';
    };
  };
}