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