smart single or multiple character deletion of x

Question

I want vim to ignore whitespace copy

Default cut x will work same but
When i cut one whitespace character or a visual block of whitespaces with x, vim register won't copy

like this thread, Vim Clever Whitespace Deletion
d or dd will cut but won't copy whitespace if it's only whitespaces
otherwise it will copy as usual
won't harm whitespaces like this situation: abc<space><space>

I only could do the first one
with this, vim won't copy single whitespaces when cut with x

function! Smart_Delete_x()
    let temp = getreg('"', 1)
    execute 'normal!' 'x'
    if matchstr(@", '\_s*') == @"    " if just whitespace
        call setreg('"', temp)
        call setreg('*', temp)
        call setreg('+', temp)
        call setreg('0', temp)
    endif
endfunction
nnoremap <silent> x :call Smart_Delete_x()<CR>

I couldn't do the visual block one.
vim won't copy blocks of whitespaces when cut with x

but if the blocks has single or multiple character like

<space>
<space>
abc

only then vim will copy

Answer 1

To make something work in visual mode, you need a visual-mode mapping (usually :x[nore]map). In this case, we need to do these steps

1. Save the register
2. Restore the selection and do the cut (x or d or whatever)
3. Restore the register if whitespace

This is reminiscent of your original function, so let's modify it to take a visual arg: if truthy, do gv before cut. (Prior to this modification, I would have just written normal! x without the :execute cruft. But now we're adding some conditional command interpolation, so we can get a bit fancier.)

Note that I'm also using the more correct getreginfo().

function! Smart_Delete_x(visual)
    let saved = getreginfo('"')
    execute printf('normal! %sx', a:visual ? 'gv' : '')
    if @" =~# '^\_s*$'
        call setreg('"', saved)
    endif
endfunction
nnoremap <silent> x :call Smart_Delete_x(v:false)<CR>
xnoremap x :<C-u>call Smart_Delete_x(v:true)<CR>

I removed restoring the clipboard and yank register. The yank register ("0) is for yanks. The clipboard should only be synchronized that way depending on 'clipboard', and I think setreg() with getreginfo() may handle some of those cases?