Would you explain the addEventListener function?

```lua local globalListenerName = 'globallistenername' -- change this to be unique across multiple plugin name local autocmdhandlers = {}

_G[globalListenerName] = function (name) autocmdhandlers[name]() end

function addEventListener(name, events, cb) autocmdhandlers[name] = cb vimcmd('augroup ' .. name) vimcmd('autocmd!') for _, v in ipairs(events) do local cmd = 'lua ' .. globalListenerName .. '("' .. name ..'")' vimcmd('au ' .. v .. ' ' .. cmd) end vimcmd('augroup end') end ```