refactor(nvim): ensure passage files aren't backed up

dots/.config/nvim/lua/core/options.lua

@@ -141,7 +141,8 @@ M.setup = function()
     opt.exrc = true
 
     -- Backups
-    opt.backupdir = vim.fn.stdpath('state') .. "/backup//"
+    opt.backupdir = vim.fn.stdpath("state") .. "/backup//"
+    opt.backupskip = opt.backupskip + "*/*passage.*"
     opt.backup = true
 end
 

dots/.config/nvim/lua/core/postload.lua

@@ -0,0 +1,23 @@
+local M = {}
+
+local augroup = vim.api.nvim_create_augroup("user-autocmds", { clear = false })
+vim.api.nvim_create_autocmd("BufReadPre", {
+    group = augroup,
+    desc = "Ensure backupskip files do not leave anything behind",
+    pattern = vim.opt.backupskip:get(),
+    callback = function(args)
+        ---@type integer
+        local bufnr = args.buf
+
+        vim.iter({
+            "swapfile",
+            "undofile",
+        }):each(function(opt)
+            vim.api.nvim_set_option_value(opt, false, {
+                buf = bufnr,
+            })
+        end)
+    end,
+})
+
+return M