Smooth window splitting animation for Vim

smooth_split.vim

function SmoothSplit(vertical = 0) abort
    syntax off
    if a:vertical
        let new_size = winwidth(0) / 2
        vertical 1 split
    else
        let new_size = winheight(0) / 2
        1 split
    endif
    if a:vertical
        " TODO: adjust diff for a number of windows already open
        for i in range(new_size)
            vertical resize +1
            sleep 1m
            redraw
        endfor
    else
        for i in range(new_size)
            resize +1
            sleep 1m
            redraw
        endfor
    endif
    syntax enable
endfunction

nnoremap <c-w>s <cmd>call SmoothSplit(0)<cr>
nnoremap <c-w>v <cmd>call SmoothSplit(1)<cr>