How to center the current line to 80% height of the current window, in NeoVim?

Question

As title. Since no one wants to become a turtle, I want to setup a behavior like M but instead pin the current line to 80% height (0% start from bottom) of the current window, not to center.

Answer 1

Update

Since I don't like scrolloff, I update to this new version:

vim.api.nvim_set_keymap('n', 'M', '<cmd>lua pin_to_80_percent_height()<CR>', NOREF_NOERR_TRUNC)
function _G.pin_to_80_percent_height()
  vim.opt.scrolloff = 5
  vim.cmd("exe 'normal! zt'")
  vim.opt.scrolloff = 0
end

---

old answer

1. Set scrolloff to 5

   vim.opt.scrolloff = 5
   

2. Set keymap M to zt.

   vim.api.nvim_set_keymap('n', 'M', 'zt', NOREF_NOERR_TRUNC)