add format on save

init.lua

@@ -659,3 +659,19 @@ require('lspconfig').rust_analyzer.setup {
 require("cmp").config.formatting = {
   format = require("tailwindcss-colorizer-cmp").formatter
 }
+
+-- 1
+vim.api.nvim_create_autocmd("LspAttach", {
+  group = vim.api.nvim_create_augroup("lsp", { clear = true }),
+  callback = function(args)
+    -- 2
+    vim.api.nvim_create_autocmd("BufWritePre", {
+      -- 3
+      buffer = args.buf,
+      callback = function()
+        -- 4 + 5
+        vim.lsp.buf.format { async = false, id = args.data.client_id }
+      end,
+    })
+  end
+})