add: setup file for null-ls

.config/nvim/after/plugin/null-ls.rc.lua

@@ -0,0 +1,42 @@
+local status, null_ls = pcall(require, "null-ls")
+if not status then
+	return
+end
+
+local augroup = vim.api.nvim_create_augroup("LspFormatting", {})
+
+local lsp_formatting = function(bufnr)
+	vim.lsp.buf.format({
+		filter = function(client)
+			return client.name == "null-ls"
+		end,
+		bufnr = bufnr,
+	})
+end
+
+null_ls.setup({
+	sources = {
+		null_ls.builtins.formatting.prettierd,
+		null_ls.builtins.formatting.autopep8,
+		null_ls.builtins.formatting.stylua,
+	},
+	on_attach = function(client, bufnr)
+		if client.supports_method("textDocument/formatting") then
+			vim.api.nvim_clear_autocmds({
+				group = augroup,
+				buffer = bufnr,
+			})
+			vim.api.nvim_create_autocmd("BufWritePre", {
+				group = augroup,
+				buffer = bufnr,
+				callback = function()
+					lsp_formatting(bufnr)
+				end,
+			})
+		end
+	end,
+})
+
+vim.api.nvim_create_user_command("DisableLspFormatting", function()
+	vim.api.nvim_clear_autocmds({ group = augroup, buffer = 0 })
+end, { nargs = 0 })