neovim-flake/modules/lsp/null-ls/config.nix

{
  pkgs,
  config,
  lib,
  ...
}:
with lib;
with builtins; let
  cfg = config.vim.lsp;
in {
  config = mkIf cfg.null-ls.enable (mkMerge [
    {
      vim.lsp.enable = true;
      vim.startPlugins = ["null-ls"];

      vim.luaConfigRC.null_ls-setup = nvim.dag.entryAnywhere ''
        local null_ls = require("null-ls")
        local null_helpers = require("null-ls.helpers")
        local null_methods = require("null-ls.methods")
        local ls_sources = {}
      '';
      vim.luaConfigRC.null_ls = nvim.dag.entryAfter ["null_ls-setup" "lsp-setup"] ''
        require('null-ls').setup({
          diagnostics_format = "[#{m}] #{s} (#{c})",
          debounce = 250,
          default_timeout = 5000,
          sources = ls_sources,
          on_attach=default_on_attach
        })
      '';
    }
    {
      vim.luaConfigRC = mapAttrs (_: v: (nvim.dag.entryBetween ["null_ls"] ["null_ls-setup"] v)) cfg.null-ls.sources;
    }
  ]);
}