nixvim/config/lsp/conform.nix

{ helpers, pkgs, ... }:
{
  plugins.conform-nvim = {
    enable = true;
    settings = {
      format_on_save = ''
        function(bufnr)
          if vim.g.disable_autoformat or vim.b[bufnr].disable_autoformat then
            return
          end

          if slow_format_filetypes[vim.bo[bufnr].filetype] then
            return
          end

          local function on_format(err)
            if err and err:match("timeout$") then
              slow_format_filetypes[vim.bo[bufnr].filetype] = true
            end
          end

          return { timeout_ms = 200, lsp_fallback = true }, on_format
         end
      '';
      format_after_save = ''
        function(bufnr)
          if vim.g.disable_autoformat or vim.b[bufnr].disable_autoformat then
            return
          end

          if not slow_format_filetypes[vim.bo[bufnr].filetype] then
            return
          end

          return { lsp_fallback = true }
        end
      '';
      formatters_by_ft = {
        python = [ "black" ];
        c = [ "clang-format" ];
        cpp = [ "clang-format" ];
        cmake = [ "cmake_format" ];
        nix = [ "nixfmt" ];
        # Standalone scalafmt is too slow, so we use it as a fallback
        scala = helpers.mkRaw ''
          { scalafmt, lsp_format = "prefer" }
        '';
        toml = [ "taplo" ];
        yaml = [ "yq" ];
        json = [ "jq" ];
      };
    };
  };

  extraPackages = with pkgs; [
    black
    clang-tools
    cmake-format
    jq
    nixfmt-rfc-style
    scalafmt
    taplo
    yq
  ];

  extraConfigLuaPre = ''
    local slow_format_filetypes = { "scala" }
  '';
}