Auto format on save

nvim/.config/nvim/init.lua

@@ -404,6 +404,19 @@ local on_attach = function(client, bufnr)
     vim.lsp.buf.format()
   end, { desc = 'Format current buffer with LSP' })
 
+  -- Format on save
+  local augroup = vim.api.nvim_create_augroup("LspFormatting", {})
+  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()
+        vim.lsp.buf.format()
+      end,
+    })
+  end
+
 	-- Attach document colour support
 	if client.server_capabilities.colorProvider then
 		require("document-color").buf_attach(bufnr)