Question: Is there something which is works same as i_CTRL-G_u, but for normal mode?

This would be useful in mappings (like nnoremap), because (I think, but fixme) in normal mode, if you are just typing commands (vs. a sequence mapped to a single key), then each command counts as a separate undo block.

Case in point: I'm trying to solve this exercise, from Learn Vimscript the Hard Way.

This is what I came up with, and it seems to work:

:nnoremap <leader>d ddi<C-G>u<esc>dd

While this works, it seems a bit hackish, going into insert mode just to break the undo sequence, so I was wondering if it is possible without going into insert mode.

Of course, I already tried the following variant, but all it does is deleting a single line, so it seems that the <C-G> part kind of ends the sequence:

:nnoremap <leader>d dd<C-G>udd
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    I nixed the spoiler—I'm not concerned about sharing the code, and it's important that the question is easy to read. If others feel strongly opposed, we can discuss – D. Ben Knoble Sep 8 '20 at 15:03
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    Not that I know of. You could try this: nnoremap <leader>d dd@=execute('let &ul = &ul')[-1]<cr>dd. But technically, it still temporarily leaves normal mode to enter the command-line (the expression one). See vi.stackexchange.com/a/26475/17449. – user938271 Sep 8 '20 at 15:09
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    "It seems a bit hackish, going into insert mode just to break the undo sequence." Welcome to Vimscript! You seem to be learning the actual lessons about it! 😂 – filbranden Sep 8 '20 at 15:14

Doing :let &ul=&ul breaks the undo sequence. This is documented under :h :undojoin:

Setting the value of 'undolevels' also breaks undo. Even when the new value is equal to the old value.

Using the described method, you can do the following:

nnoremap <leader>d dd:let &ul=&ul<CR>dd
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    This is documented at the end of :h :undoj. More specifically here. – user938271 Sep 8 '20 at 17:26
  • @user938271 thanks, I'll update my answer to reflect that. – Jake Grossman Sep 8 '20 at 18:23

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