Add nvim autocmds: trim whitespace, restore cursor, yank highlight

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

nvim/.config/nvim/lua/config/autocmds.lua

@@ -1,8 +1,52 @@
 -- Autocmds are automatically loaded on the VeryLazy event
 -- Default autocmds that are always set: https://github.com/LazyVim/LazyVim/blob/main/lua/lazyvim/config/autocmds.lua
---
--- Add any additional autocmds here
--- with `vim.api.nvim_create_autocmd`
---
--- Or remove existing autocmds by their group name (which is prefixed with `lazyvim_` for the defaults)
--- e.g. vim.api.nvim_del_augroup_by_name("lazyvim_wrap_spell")
+
+local autocmd = vim.api.nvim_create_autocmd
+local augroup = vim.api.nvim_create_augroup
+
+-- Remove trailing whitespace on save
+autocmd("BufWritePre", {
+  group = augroup("trailing_whitespace", { clear = true }),
+  pattern = "*",
+  callback = function()
+    local pos = vim.api.nvim_win_get_cursor(0)
+    vim.cmd([[%s/\s\+$//e]])
+    vim.api.nvim_win_set_cursor(0, pos)
+  end,
+})
+
+-- Restore last cursor position
+autocmd("BufReadPost", {
+  group = augroup("restore_cursor", { clear = true }),
+  callback = function()
+    local mark = vim.api.nvim_buf_get_mark(0, '"')
+    local lines = vim.api.nvim_buf_line_count(0)
+    if mark[1] > 0 and mark[1] <= lines then
+      pcall(vim.api.nvim_win_set_cursor, 0, mark)
+    end
+  end,
+})
+
+-- Highlight on yank
+autocmd("TextYankPost", {
+  group = augroup("highlight_yank", { clear = true }),
+  callback = function()
+    vim.highlight.on_yank({ timeout = 200 })
+  end,
+})
+
+-- Auto-resize splits on window resize
+autocmd("VimResized", {
+  group = augroup("resize_splits", { clear = true }),
+  command = "tabdo wincmd =",
+})
+
+-- Close some filetypes with q
+autocmd("FileType", {
+  group = augroup("close_with_q", { clear = true }),
+  pattern = { "help", "man", "qf", "checkhealth", "lspinfo", "startuptime" },
+  callback = function(event)
+    vim.bo[event.buf].buflisted = false
+    vim.keymap.set("n", "q", "<cmd>close<cr>", { buffer = event.buf, silent = true })
+  end,
+})