config.nvim/lua/autocommands.lua

local augroup = vim.api.nvim_create_augroup("UserConfig", {})

-- Highlight yanked text

vim.api.nvim_create_autocmd("TextYankPost", {
  group = augroup,
  callback = function()
    vim.highlight.on_yank()
  end,
})

-- Return to last edit position when opening files

vim.api.nvim_create_autocmd("BufReadPost", {
  group = augroup,
  callback = function()
    local mark = vim.api.nvim_buf_get_mark(0, '"')
    local lcount = vim.api.nvim_buf_line_count(0)
    local line = mark[1]
    local ft = vim.bo.filetype
    if line > 0 and line <= lcount
      and vim.fn.index({ "commit", "gitrebase", "xxd" }, ft) == -1
      and not vim.o.diff then
      pcall(vim.api.nvim_win_set_cursor, 0, mark)
    end
  end,
})

-- Auto-close terminal when process exits

vim.api.nvim_create_autocmd("TermClose", {
  group = augroup,
  callback = function()
    if vim.v.event.status == 0 then
      vim.api.nvim_buf_delete(0, {})
    end
  end,
})

-- Auto-resize splits when window is resized

vim.api.nvim_create_autocmd("VimResized", {
  group = augroup,
  callback = function()
    vim.cmd("tabdo wincmd =")
  end,
})

-- Create directories when saving files

vim.api.nvim_create_autocmd("BufWritePre", {
  group = augroup,
  callback = function()
    local dir = vim.fn.expand('<afile>:p:h')
    if vim.fn.isdirectory(dir) == 0 then
      vim.fn.mkdir(dir, 'p')
    end
  end,
})

-- Folding config

vim.api.nvim_create_autocmd("FileType", {
  callback = function()
    if require("nvim-treesitter.parsers").has_parser() then
      vim.opt.foldmethod = "expr"
      vim.opt.foldexpr = "nvim_treesitter#foldexpr()"
    else
      vim.opt.foldmethod = "syntax"
    end
  end,
})