Add autoformat for rust

lua/plugins/lsp.lua

@@ -36,6 +36,14 @@ return {
       vim.lsp.config("rust_analyzer", {})
       vim.lsp.enable("rust_analyzer")
 
+      -- Auto format
+      vim.api.nvim_create_autocmd("BufWritePre", {
+        pattern = "*.rs",
+        callback = function()
+          vim.lsp.buf.format({ async = false })
+        end,
+      })
+
       -- Floating diagnostic on hover
       vim.api.nvim_create_autocmd("CursorHold", {
         callback = function()