in a word, can I detect user undo buffer into a diffevent status?

it must can detect these case:
1. press u
2. press U
3. press :undo<CR>
4. function! My_undo()
        " some code...
        undo
        " some code...
    endfunction
    and press :call My_undo() or <C-R>=My_undo()<CR> or any other way
to call My_undo()

5. function My_undo()
        " some code...
        norm u
        " or
        norm U
        " some code....
    endfunction
    as above...

can I did this? Or I need to add a autocmd to implement it myself?

thanks for attention it, and waitting for reply...
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