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Basically I want to access the last \w\+ in my current insertion. (Hence I asked this question.)

Another solution I thought of was something like the following (I'm echoing, but clearly I'd pass it to a function in my real usecase¹):

augroup Foo
  autocmd!
  autocmd TextChangedI,TextChangedP * echo '<' . expand('<cword>') . '>'
augroup END

but it doesn't, as it prints <> while I type, and it does put some word in between < and > when I go insert mode, ... but not always. So I think I've not really understood what <cword> is and what makes it change.


(¹) I have come up with a fairly complex solution, whereby I pass col('.') to the function in the autocmd (the one taking the palce of the echo in the toy example above) and use that to regex-match the last word being written.

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  • You might try <C-r><C-w>?
    – D. Ben Knoble
    Jun 4, 2023 at 13:54

1 Answer 1

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<cword> is mostly a command-line mode thing, not an insert mode thing. I don't think it is reliable in this context.

Here is how I would approach the initial problem:

augroup Foo
  autocmd!
  autocmd TextChangedI,TextChangedP * echom getline('.')->matchstr('\w\+\%.c')
augroup END

where…

  • :help getline() grabs the text of the given line,
  • :help matchstr() returns the part of it that matches the given pattern,
  • \w\+\%.c matches as many word characters as possible (\w\+) before the cursor (\%.c is a zero-width match).

Issues left for OP to figure out:

  • This grabs the word before the cursor, which is not necessarily the word that is being inserted. Leaving a mark on InsertEnter and using that to anchor the pattern might help.
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  • "pettern"… sigh.
    – romainl
    Jun 5, 2023 at 16:15

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