fix rails setup

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

@@ -4,15 +4,37 @@ if not setup then
 end
 
 local formatting = null_ls.builtins.formatting
-local diagnostics = null_ls.builtins.diagnostics
+local conditional = function(fn)
+	local utils = require("null-ls.utils").make_conditional_utils()
+	return fn(utils)
+end
+
 local augroup = vim.api.nvim_create_augroup("LspFormatting", {})
 
 null_ls.setup({
 	sources = {
 		formatting.prettier,
 		formatting.stylua,
-		diagnostics.eslint_d,
-		diagnostics.rubocop,
+
+		-- Here we set a conditional to call the rubocop formatter. If we have a Gemfile in the project, we call "bundle exec rubocop", if not we only call "rubocop".
+		conditional(function(utils)
+			return utils.root_has_file("Gemfile")
+					and null_ls.builtins.formatting.rubocop.with({
+						command = "bundle",
+						args = vim.list_extend({ "exec", "rubocop" }, null_ls.builtins.formatting.rubocop._opts.args),
+					})
+				or null_ls.builtins.formatting.rubocop
+		end),
+
+		-- Same as above, but with diagnostics.rubocop to make sure we use the proper rubocop version for the project
+		conditional(function(utils)
+			return utils.root_has_file("Gemfile")
+					and null_ls.builtins.diagnostics.rubocop.with({
+						command = "bundle",
+						args = vim.list_extend({ "exec", "rubocop" }, null_ls.builtins.diagnostics.rubocop._opts.args),
+					})
+				or null_ls.builtins.diagnostics.rubocop
+		end),
 	},
 	-- format on save
 	on_attach = function(client, bufnr)
@@ -22,7 +44,6 @@ null_ls.setup({
 				group = augroup,
 				buffer = bufnr,
 				callback = function()
-					-- on 0.8, you should use vim.lsp.buf.format({ bufnr = bufnr }) instead
 					vim.lsp.buf.format({ bufnr = bufnr, timeout_ms = 10000 })
 				end,
 			})