{ pkgs, lib, ... }:
let
  inherit (lib) getExe;
  indent = {
    tab-width = 2;
    unit = "  ";
  };
  auto-format = true;
in
{
  programs.helix = with pkgs; {
    languages = {
      language =
        let
          prettier = nodePackages_latest.prettier;
        in
        [
          {
            # NIX LSP
            inherit auto-format indent;
            name = "nix";
            language-servers = [
              "nixd"
              "nil"
            ];
            formatter.command = "${getExe nixfmt-rfc-style}";
          }
          {
            # HTML
            inherit auto-format indent;
            name = "html";
            language-servers = [ "vscode-html" ];
            formatter = {
              command = "${getExe prettier}";
              args = [
                "--use-tabs"
                "--parser"
                "html"
              ];
            };
          }
          {
            # JSON
            inherit auto-format indent;
            name = "json";
            language-servers = [ "vscode-json" ];
            formatter = {
              command = "${getExe prettier}";
              args = [
                "--use-tabs"
                "--parser"
                "json"
              ];
            };
          }
          {
            # JSON
            inherit auto-format indent;
            name = "jsonc";
            language-servers = [ "vscode-json" ];
            formatter = {
              command = "${getExe prettier}";
              args = [
                "--use-tabs"
                "--parser"
                "json"
              ];
            };
          }
          {
            # CSS
            inherit auto-format indent;
            name = "css";
            language-servers = [ "vscode-css" ];
            formatter = {
              command = "${getExe prettier}";
              args = [
                "--use-tabs"
                "--parser"
                "css"
              ];
            };
          }
          {
            # MARKDOWN
            inherit auto-format indent;
            name = "markdown";
            language-servers = [ "marksman" ];
            formatter = {
              command = "${getExe prettier}";
              args = [
                "--use-tabs"
                "--parser"
                "markdown"
              ];
            };
          }
          {
            # TYPESCRIPT
            inherit auto-format indent;
            name = "typescript";
            language-servers = [ "typescript" ];
            formatter = {
              command = "${getExe prettier}";
              args = [
                "--use-tabs"
                "--parser"
                "typescript"
              ];
            };
          }
          {
            # PYTHON
            inherit auto-format indent;
            name = "python";
            language-servers = [
              "pylsp"
              "ruff"
            ];
            shebangs = [ "${getExe python39}" ];
            file-types = [
              "py"
              "pyi"
              "py3"
              "pyw"
              ".pythonstartup"
              ".pythonrc"
            ];
            roots = [
              "."
              "pyproject.toml"
              "pyrightconfig.json"
            ];
            comment-token = "#";
            scope = "source.python";
            injection-regex = "python";
            formatter = {
              command = "${getExe ruff}";
              args = [
                "format"
                "-"
              ];
            };
          }
        ];
      language-server =
        let
          vscode = vscode-langservers-extracted;
          typescript = typescript-language-server;
        in
        {
          nil.command = "${getExe nil}";
          nixd.command = "${getExe nixd}";
          typescript.command = "${getExe typescript}";
          vscode-html.command = "${vscode}/bin/vscode-html-language-server";
          vscode-json.command = "${vscode}/bin/vscode-json-language-server";
          vscode-css.command = "${vscode}/bin/vscode-css-language-server";
          marksman.command = "${getExe marksman}";
          ruff.command = "${getExe ruff-lsp}";
          pyright = {
            command = "${getExe pyright}";
            args = [ "--stdio" ];
            config = {
              reportMissingTypeStubs = false;
              python.analysis = {
                typeCheckingMode = "basic";
                autoImportCompletions = true;
              };
            };
          };
        };
    };
    extraPackages = with pkgs; [
      # OTHER LSP
      yaml-language-server
      lua-language-server
      taplo
    ];
  };
}