add null-ls

lua/user/lsp/init.lua

@@ -1,7 +1,8 @@
 local status_ok, _ = pcall(require, "lspconfig")
 if not status_ok then
-	return
+  return
 end
 
-require("user.lsp.lsp-installer")
+require "user.lsp.lsp-installer"
 require("user.lsp.handlers").setup()
+require "user.lsp.null-ls"

lua/user/lsp/null-ls.lua

@@ -0,0 +1,19 @@
+local null_ls_status_ok, null_ls = pcall(require, "null-ls")
+if not null_ls_status_ok then
+	return
+end
+
+-- https://github.com/jose-elias-alvarez/null-ls.nvim/tree/main/lua/null-ls/builtins/formatting
+local formatting = null_ls.builtins.formatting
+-- https://github.com/jose-elias-alvarez/null-ls.nvim/tree/main/lua/null-ls/builtins/diagnostics
+local diagnostics = null_ls.builtins.diagnostics
+
+null_ls.setup({
+	debug = false,
+	sources = {
+		formatting.prettier.with({ extra_args = { "--no-semi", "--single-quote", "--jsx-single-quote" } }),
+		formatting.black.with({ extra_args = { "--fast" } }),
+		formatting.stylua,
+    -- diagnostics.flake8
+	},
+})

lua/user/plugins.lua

@@ -71,6 +71,7 @@ return packer.startup(function(use)
   use "neovim/nvim-lspconfig" -- enable LSP
   use "williamboman/nvim-lsp-installer" -- simple to use language server installer
   use "tamago324/nlsp-settings.nvim" -- language server settings defined in json for
+  use "jose-elias-alvarez/null-ls.nvim" -- for formatters and linters
 
   -- Telescope
   use "nvim-telescope/telescope.nvim"