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

local cmd = vim.cmd
local fn = vim.fn

local vimrc = vim.api.nvim_create_augroup("vimrc", { clear = true })

local function autocmd(event, pattern, opts)
  vim.api.nvim_create_autocmd(event,
    vim.tbl_extend("keep", opts, {
      group = vimrc,
      pattern = pattern,
    })
  )
end

local function cb(func)
  return { callback = function(_) func() end }
end

-- >> neovim specific
-- Always start terminals in insert/terminal mode
autocmd("TermOpen", "*", cb(cmd.startinsert))

-- neovim's autoread doesn't do this by default.
autocmd("FocusGained", "*", cb(cmd.checktime))

-- >> autowriteall improvment
-- Stopinsert on leave, or autowriteall doesn't work.
autocmd({"WinLeave", "FocusLost"}, "*", { callback = function(_)
  if not fn.pumvisible() then
    fn.stopinsert()
  end
end })

-- write all on leave
autocmd("FocusLost", "*", cb(cmd.wa))


-- >> auto mkpath on write
autocmd("BufWritePre", "*", { callback = function(ctx)
  if vim.bo[ctx.buf].buftype == "" 
    and not string.match(ctx.file, "^[%w]+:")
  then
    fn.mkdir(fn.fnamemodify(ctx.file, ":p:h"), "p")
  end
end })

-- >> auto session ?

-- >> jump to last position on open
autocmd("BufReadPost", "*", { callback = function(_)
  local ft = vim.bo.filetype
  if ft == "mail" or string.match(ft, "^git") or string.match(ft, "^hg") then
    return ''
  end

  local lastpos = fn.line([['"]])
  if lastpos >= 1 and lastpos <= fn.line("$") then
    vim.cmd([[normal! g`"]])
  end
end })

-- >> simple highlight conflict markers
autocmd("BufReadPost", "*", { callback = function(_)
  fn.matchadd("Error", [[^\([<>|]\)\{7} \@=\|^=\{7}$]])
end })

-- >> nicer quickfix
autocmd("BufReadPost", "quickfix", { callback = function(ctx)
  -- simplify noisy :ltag output
  if string.match(vim.w.quickfix_title, "^ltag") then
    fn.matchadd("Conceal", [[|\zs\^\\V\|\\$|.*]])
  end

  -- easy close
  vim.keymap.set("n", "q", "<C-w>q", {buffer = true})
end })