unofficial mirror of help-gnu-emacs@gnu.org
 help / color / mirror / Atom feed
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



      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]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: https://www.gnu.org/software/emacs/

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=87blhbyxbv.fsf@fastmail.fm \
    --to=joostkremers@fastmail.fm \
    --cc=dimech@gmx.com \
    --cc=help-gnu-emacs@gnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).