Lua function to toggle three options

Lua
1

I have the following vim.keymap.set:

-- vimscript way:
-- inoremap <expr> <Home> col('.') == 1 ? '<C-O>^' : '<C-O>0'

vim.keymap.set('n', '0',
 function()
  local pos = (vim.api.nvim_win_get_cursor(0)[2]+1)
  vim.cmd('normal! ^')
  if pos == (vim.api.nvim_win_get_cursor(0)[2]+1) then
    vim.cmd('normal! 0')
  end
end, { noremap = true, silent = true, desc = "toggle between start of the line of first non blank", }
)

I want to improve this function to add $ or g_ as a third option, it would be great. Maybe a shorter way of getting the current cursor position. Is vim.fn.getpos('.') something better than what I am doing?

Another idea is to avoid this mapping when using macros, because the expected behavior of zero in normal mode is jumping to the first character of the line, that’s way I have lost my old vim mapping that I were used to toggle these three options.

Just as a tip, I also have other complicated mappings, still using vim syntax:

map( "n", "<C-l>", [[ (&hls && v:hlsearch ? ':nohls' : ':set hls')."\n" <BAR> redraw<CR>]],
   { silent = true, expr = true, desc = "toggles highlighting" })
2 
vim.keymap.set('n', '0',
 function()
  local pos = (vim.api.nvim_win_get_cursor(0)[2]+1)
  vim.cmd('normal! ^')
  if pos == (vim.api.nvim_win_get_cursor(0)[2]+1) then
    vim.cmd('normal! 0')
    return
    end
    if pos == 1 then
        vim.cmd('normal! g_')
    end
  end, { noremap = true, silent = true, desc = "toggle between start of the line of first non blank", }
)

Later I will format properly because I am on android now!

3

Now I will try to rewrite this mapping using zero as the first jump, this way, if I record a macro I will not to unmap zero or worry about messing things up