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bug#25665: 26.0.50; [PATCH] Indicate prefix arg in minibuffer prompt for


From: Tino Calancha
Subject: bug#25665: 26.0.50; [PATCH] Indicate prefix arg in minibuffer prompt for shell-command
Date: Fri, 10 Feb 2017 16:13:26 +0900 (JST)
User-agent: Alpine 2.20 (DEB 67 2015-01-07)



On Thu, 9 Feb 2017, address@hidden wrote:

Tino Calancha <address@hidden> writes:

On Thu, 9 Feb 2017, address@hidden wrote:

On Thu, Feb 9, 2017 at 11:53 AM, Tino Calancha <address@hidden> wrote:

The meaning of the prefix argument must be explained in the docstring.
That and the manual are the source of documentation, not the prompt.

But it's nice if Emacs gives you a different prompt, so that you can be
sure you typed in the command correctly.
Confirmation for having typed C-u?
Well, sometimes some keys in old keyboards die... ;-)

We already have that in `echo-keystrokes'.

But I'm thinking also of times when you do C-u M-! and then switch to
another window to copy the command, then maybe when you come back, you
don't remember 100% what you were doing.
I see.  That's a point.  I agree in that edge case would be useful.

There are lots of commands in Emacs accepting a raw,
numeric prefix etc.  If we change M-! prompt, we might
also want to tune the prompt for all of them.  Do we want that?

IMO yes, if the difference can be summarized in the prompt concisely
enough.
It might be a pain in the ass to follow such new policy:
emacs -Q:
  C-x b foo RET
  aeiou
I)
    C-x C-s
II)
    C-u C-x C-s
III)
    C-u C-u C-x C-s
IV)
    C-u C-u C-u C-x C-s

All have the same prompt:
File to save in: ~/





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