fix(bigfile): replace abandoned bigfile.nvim with native BufReadPre autocmd

bigfile.nvim (LunarVim) is unmaintained since 2023 and calls
vim.validate{<table>} which is deprecated and removed in Nvim 1.0.

Replace with a plain autocmd in lua/autocmds.lua that replicates every
feature: swapfile/undo/fold opts, matchparen, LSP block, treesitter stop,
illuminate, ibl and deferred syntax/filetype clear.

Author: Venkata Subramani Renduchintala

README.md

@@ -242,6 +242,6 @@ See [`test/README.md`](test/README.md) for the full test suite documentation —
 - **[nvim-colorizer](https://github.com/norcalli/nvim-colorizer.lua)** — inline color preview for hex codes and CSS colors
 - **[undotree](https://github.com/mbbill/undotree)** — visual undo history tree
 - **[project.nvim](https://github.com/ahmedkhalf/project.nvim)** — automatic project root detection and project switching
-- **[bigfile.nvim](https://github.com/LunarVim/bigfile.nvim)** — disables heavy features for large files to maintain performance
+- **Large file handler** — native `BufReadPre` autocmd disables LSP, treesitter, syntax, illuminate and swapfile for files larger than 2 MiB
 - **[neoscroll.nvim](https://github.com/karb94/neoscroll.nvim)** — smooth scrolling animations
 - **[vim-startify](https://github.com/mhinz/vim-startify)** — start screen with recent files and sessions

lua/autocmds.lua

@@ -61,3 +61,44 @@ vim.api.nvim_create_autocmd("FileType", {
     vim.opt_local.formatoptions:remove { "t", "c", "a", "r", "o" }
   end,
 })
+
+-- Large file handler: disable heavy features for files > 2 MiB
+vim.api.nvim_create_autocmd("BufReadPre", {
+  callback = function(args)
+    local buf = args.buf
+    local ok, stat = pcall(vim.uv.fs_stat, vim.api.nvim_buf_get_name(buf))
+    if not (ok and stat and stat.size > 2 * 1024 * 1024) then
+      return
+    end
+
+    vim.opt_local.swapfile = false
+    vim.opt_local.foldmethod = "manual"
+    vim.opt_local.undolevels = -1
+    vim.opt_local.undoreload = 0
+    vim.opt_local.list = false
+
+    if vim.fn.exists(":DoMatchParen") == 2 then
+      vim.cmd("NoMatchParen")
+    end
+
+    vim.api.nvim_create_autocmd("LspAttach", {
+      buffer = buf,
+      callback = function(lsp_args)
+        vim.schedule(function()
+          vim.lsp.buf_detach_client(buf, lsp_args.data.client_id)
+        end)
+      end,
+    })
+
+    pcall(vim.treesitter.stop, buf)
+    pcall(function() require("illuminate.engine").stop_buf(buf) end)
+    pcall(function() require("ibl").setup_buffer(buf, { enabled = false }) end)
+
+    vim.schedule(function()
+      if vim.api.nvim_buf_is_valid(buf) then
+        vim.bo[buf].syntax = "OFF"
+        vim.bo[buf].filetype = ""
+      end
+    end)
+  end,
+})

lua/plugins/configs/bigfile.lua

@@ -71,7 +71,6 @@ local plugins = {
 	require("plugins.configs.comment"),
 	require("plugins.configs.flash"),
 	require("plugins.configs.todo"),
-	require("plugins.configs.bigfile"),
 	require("plugins.configs.splitjoin"), -- Quick split or join of lists
   "mg979/vim-visual-multi",