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In an unusual state, I want to ensure that a user sees a warning message upon startup, and presses a key to continue.

I could use sleep <seconds>, but I'm sure that vim can do this. Go vim!

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2 Answers 2

Reset to default
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You can use the input function, e.g.

call input('Press any key to continue')

See :h input().

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  • 1
    To add to your answer, you could also do inputdialog('Press any key to continue') for GUI.
    – DJMcMayhem
    Sep 27, 2016 at 6:27
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    Close. You've implemented "Press enter to continue". Not exactly what I was looking for.
    – Tom Hale
    Sep 27, 2016 at 7:16
  • True. Sorry, I was a little bit too quick here. I think @IngoKarkat's answer is then more correct, in particular with the getchar() function. I could update my answer, but I think it is more fair to mark Ingo's answer as correct.
    – Karl Yngve Lervåg
    Sep 27, 2016 at 13:09
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  • For a confirmation, I would use :call confirm('My warning here'); this uses a popup window in GVIM.
  • To wait for any character, you can use :call getchar().
  • For a confirmation with Enter, the already mentioned :call input('Press enter to continue')

Many people would consider such mandatory interrupt bad user experience. I don't know about your exact use case, but in general, I would just :autocmd VimEnter * echoerr 'Houston, we have a problem'. If the user somehow didn't see the message, :messages will recall them.

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