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bug#28525: 26.0.60; dired-delete-file: Accept y/n if yes-or-no-p is alia

From: Tino Calancha
Subject: bug#28525: 26.0.60; dired-delete-file: Accept y/n if yes-or-no-p is aliased to y-or-n-p
Date: Mon, 2 Oct 2017 14:40:20 +0900 (JST)
User-agent: Alpine 2.20 (DEB 67 2015-01-07)

On Sun, 1 Oct 2017, Drew Adams wrote:

FWIW: I don't think that Emacs should test for
function aliases and change its behavior accordingly.

I don't think users should be encouraged to alias
`yes-or-no-p' to `y-or-n-p'.  That's a bad idea
_in general_, IMO, even if it some users might
find it's appropriate for them.

I think that making Emacs code automatically
recognize such an alias just encourages such
(bad) practice on the part of users.


FWIW2: It can, however, be helpful to let users
override a design choice of `y-or-n-p' or
`yes-or-no-p' _for a given calling function_
(as opposed to globally).  I've written library
Yes-No, to provide such a feature.


Thank you for the detailed answer.

Your library looks a good solution to add more control
where to allow aliasing 'yes-or-no-p to 'y-or-n-p.

Here, what i am trying to propose is different: extend the
'yes or no' functions (or add two new functions),
so that they accept more than 2 answers.
This is inpired in the way `query-replace' works:

M-% a RET o RET
This prompts to replace 'a' with 'o'.  In principle this
looks like a 'yes or no' question; actually  we can
provide additional answers: all possibilities are listed
if the user inputs 'h'.  For example, '!' performs all replacements
without further questions.

We find something similar in dired-delete-file: in addition
to 'yes', 'no', we can answer to delete all the dirs with
no more questions.

A function like 'yes-or-no-p' accepting more than 2 answers
might be used to handle the examples above, and future cases.

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