Split Toggle

split-toggle.vim

nnoremap <Leader>s <Cmd>call SplitToggle()<CR>
command SplitToggle call SplitToggle()

function! SplitToggle() abort
  " Check if there's already a split
  if !exists('s:split_id')
    " Create the split
    vsplit
    " Move to the new window
    wincmd p
    " Make a note of its ID
    let s:split_id = win_getid()
    " Move back
    wincmd p
  else
    " Try moving to the split
    if win_gotoid(s:split_id)
      " Close it
      wincmd c
    endif
    " Remove the saved ID
    unlet s:split_id
  endif
endfunction