add format on save

init.lua

@@ -47,7 +47,7 @@ require('lazy').setup({
 
       -- Useful status updates for LSP
       -- NOTE: `opts = {}` is the same as calling `require('fidget').setup({})`
-      { 'j-hui/fidget.nvim',tag = 'legacy', opts = {} },
+      { 'j-hui/fidget.nvim',       tag = 'legacy', opts = {} },
 
       -- Additional lua configuration, makes nvim stuff amazing!
       'folke/neodev.nvim',
@@ -590,7 +590,7 @@ vim.api.nvim_set_keymap('n', '<Leader>m', '<cmd>lua require("harpoon.mark").add_
   { noremap = true, silent = true })
 vim.api.nvim_set_keymap('n', '<Leader><Tab>', '<cmd>lua require("harpoon.ui").toggle_quick_menu()<CR>',
   { noremap = true, silent = true })
-]]--
+]] --
 
 local harpoon = require('harpoon')
 harpoon:setup({
@@ -605,7 +605,7 @@ vim.keymap.set("n", "<Leader><Tab>", function() harpoon.ui:toggle_quick_menu(har
 vim.keymap.set("n", "<Leader>m", function() harpoon:list():append() end,
   { desc = "Append file to harpoon list" })
 
-vim.keymap.set("n", "<Leader>1", function() harpoon:list():select(1)end,
+vim.keymap.set("n", "<Leader>1", function() harpoon:list():select(1) end,
   { desc = "Open File No 1" })
 vim.keymap.set("n", "<Leader>2", function() harpoon:list():select(2) end,
   { desc = "Open File No 2" })
@@ -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
+})