{
  lib,
  helpers,
  ...
}:
let
  inherit (helpers) mkRaw;
  use_tectonic = false;
in
{
  plugins.lsp.servers = {
    texlab = {
      enable = true;
      filetypes = [
        "tex"
        "plaintex"
        "bib"
      ];
      settings = {
        texlab = {
          # --------------------------------
          # -- START texlab main config
          # -- if used with texmagic, disable this
          # --------------------------------
          # https://github.com/latex-lsp/texlab/wiki/Configuration#deprecated-texlabauxdirectory
          # auxDirectory = "tex_aux_output"; # deprecated
          rootDirectory = false;
          build = lib.mkMerge [
            (lib.mkIf (!use_tectonic) {
              executable = "latexmk";
              args = [
                "-xelatex"
                "-verbose"
                # -- "-outdir=%f_output"
                # -- "-auxdir=%f_aux"
                "-auxdir=tex_aux_output"
                "-file-line-error"
                # https://github.com/latex-lsp/texlab/wiki/Previewing
                # use for forward serach and inverse search
                "-synctex=1"

                "-interaction=nonstopmode"
                # "-pvc" # preview continuously update instead if -pv (open a new instance)
                "%f"
              ];
            })
            (lib.mkIf use_tectonic {
              executable = "tectonic";
              # https://github.com/latex-lsp/texlab/wiki/Tectonic
              # V2
              args = [
                "-X"
                "compile"
                "%f"
                "--synctex"
                "--keep-logs"
                "--keep-intermediates"
              ];
            })
            {
              auxDirectory = "tex_aux_output";
              logDirectory = "tex_aux_output";
              pdfDirectory = ".";
              # -- forwardSearchAfter = true,
              isContinuous = true;
              # -- "onSave = true" failed to work properly with large files like moderncv
              # -- it would not build properly until you delete all the intermediate files
              onSave = true;
              # --------------------------------
              # -- END texlab main config
              # -- if used with texmagic, disable this
              # --------------------------------
              # https://github.com/latex-lsp/texlab/wiki/Previewing#zathura
            }
          ];
          forwardSearch = {
            executable = "zathura";
            args = [
              "--synctex-forward"
              "%l:1:%f"
              "%p"
            ];
          };
          # Inverse Search for zathura set in ~/.config/zathura/zathurarc
          # set synctex true
          # set synctex-editor-command "texlab inverse-search -i %{input} -l %{line}"
          chktex = {
            onOpenAndSave = true;
            onEdit = true;
          };
          # https://github.com/neovim/nvim-lspconfig/blob/master/lua/lspconfig/configs/texlab.lua#L179-L183
          # https://github.com/neovim/nvim-lspconfig/blob/master/lua/lspconfig/configs/texlab.lua#L179-L183
          latexindent = {
            local = ./indentconfig.yaml;
          };
        };
      };
    };
  };
  autoCmd = [
    {
      pattern = [ "tex" ];
      event = [ "FileType" ];
      callback = mkRaw ''
        function()
          -- vim.keymap.set( 'n', '<leader>TH', "<CMD>TexlabBuild<CR>", { desc = 'TexlabBuild' })
          -- vim.keymap.set( 'n', '<leader>TD', "<CMD>TexlabCleanAuxiliary<CR>", { desc = 'TexlabCleanAuxiliary' })
          -- vim.keymap.set( 'n', '<leader>TN', "<CMD>TexlabForward<CR>", { desc = 'TexlabForward' })
          vim.keymap.set( 'n', '<leader>TH', function() vim.cmd.TexlabBuild() end, { desc = 'TexlabBuild' })
          vim.keymap.set( 'n', '<leader>TD', function() vim.cmd.TexlabCancelBuild(); vim.cmd.TexlabCleanAuxiliary() end, { desc = 'TexlabCancelBuild+CleanAuxiliary' })
          vim.keymap.set( 'n', '<leader>Td', function() vim.cmd.TexlabCleanArtifacts() end, { desc = 'TexlabCleanArtifacts' })
          vim.keymap.set( 'n', '<leader>TN', function() vim.cmd.TexlabForward() end, { desc = 'TexlabForward' })
        end
      '';
    }
  ];
}