From: Joost Kremers <joostkremers@fastmail.fm>
To: Christopher Dimech <dimech@gmx.com>
Cc: help-gnu-emacs@gnu.org
Subject: Re: Emacs Interactive functions with arguments
Date: Fri, 09 Oct 2020 22:10:44 +0200 [thread overview]
Message-ID: <87blhbyxbv.fsf@fastmail.fm> (raw)
In-Reply-To: <trinity-8a6770e7-44e5-4f2f-bc1d-b443546c69ce-1602244369148@3c-app-mailcom-bs09>
On Fri, Oct 09 2020, Christopher Dimech wrote:
[snip]
The interactive codes "n" and "N" both return a number. "n" *always* reads a
number in the minibuffer, so any prefix argument the user types is ignored. "N"
returns the prefix argument as a number, but will ask for a number in the
minibuffer if there is no prefix argument.
"p" OTOH always returns the prefix argument as a number, even if the user didn't
type one. (In that case, the value is 1).
> Besides general comments, I have some specific question.
> (1) The two constructs (interactive "p") and (interactive "pMessage: ")
> are valid, but are they equivalent?
"p" doesn't take a prompt, because it never asks for input through the
minibuffer. So if you provide a prompt, it is simply ignored.
> (2) How is (interactive "p") different from (interactive "N").
> They both represent numeric arguments, but what is different?
"p" never asks for a number in the minibufffer, "N" does, if necessary.
--
Joost Kremers
Life has its moments
prev parent reply other threads:[~2020-10-09 20:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-09 11:52 Emacs Interactive functions with arguments Christopher Dimech
2020-10-09 14:10 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-10-09 14:42 ` Christopher Dimech
2020-10-09 20:10 ` Joost Kremers [this message]
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