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RE: read-face-name PROMPT arg should be self-contained, including ": "
From: |
Drew Adams |
Subject: |
RE: read-face-name PROMPT arg should be self-contained, including ": " |
Date: |
Sat, 17 Mar 2007 12:13:27 -0700 |
`read-face-name' still blindly appends ": " to the prompt it is supplied.
This means that it doesn't conform to what other functions, such as
`completing-read' do. It also means that code that is intended to work with
Emacs 20 as well must have two separate calls to `read-face-name', just to
work around the change in prompt behavior, one with a prompt arg that
includes the ": " and one with a prompt arg that doesn't include it.
Can we please change this exceptional prompt treatment of `read-face-name',
to make it compatible with `completing-read' behavior and with the previous
`read-face-name' behavior? Nothing important is gained by having the
function tweak the prompt blindly this way. Please let user code decide what
prompt to use, rather than having `read-file-name' try to second-guess what
prompt is needed.
If it is insisted that `read-file-name' try to be smart this way, then at
least have it check the prompt arg to first strip any trailing ": ", before
it appends ": ". That will let most programs that use it work with any Emacs
version. Something as simple as this, for example:
(when (string-match ": $" prompt)
(setq prompt (substring prompt 0 -2)))
(It would still be better to let user programs control the prompt, with no
second-guessing.)
P.S. I suggest this for Emacs, not for myself. I've already redefined
`read-face-name' in my own code to undo this prompt intelligence.
> From: Drew Adams Sent: Tuesday, January 23, 2007 10:32 AM
> To: Emacs-Pretest-Bug
>
> emacs -Q
>
> `read-face-name' has changed the meaning and behavior of its PROMPT
> arg since Emacs 20, and it is now unconventional, conflicting with
> standard Emacs treatment of PROMPT args. It should not append ": ".
> Instead, calling functions should do that themselves as they deem
> appropriate.
>
> This change was made in Emacs 21, but it is not a good change. It is
> presumably an attempt to be smart, but it reduces flexibility for
> calling functions. `read-face-name' should treat its PROMPT arg the
> same way that other Emacs prompting functions, such as
> `completing-read', treat their PROMPT args.
...
> There is at least one other function that is [also] non-standard wrt
> tacking on ": " instead of expecting the PROMPT arg to include it if
> needed: `bookmark-completing-read'. This problem should be fixed for
> `bookmark-completing-read' also. It's better to leave ": " to the
> calling function.
- RE: read-face-name PROMPT arg should be self-contained, including ": ",
Drew Adams <=
- Re: read-face-name PROMPT arg should be self-contained, including ": ", Richard Stallman, 2007/03/18
- RE: read-face-name PROMPT arg should be self-contained, including ": ", Drew Adams, 2007/03/18
- Re: read-face-name PROMPT arg should be self-contained, including ": ", Stefan Monnier, 2007/03/18
- RE: read-face-name PROMPT arg should be self-contained, including ": ", Drew Adams, 2007/03/19
- Re: read-face-name PROMPT arg should be self-contained, including ": ", Stefan Monnier, 2007/03/19
- RE: read-face-name PROMPT arg should be self-contained, including ": ", Drew Adams, 2007/03/19
- Re: read-face-name PROMPT arg should be self-contained, including ": ", Stefan Monnier, 2007/03/19
- RE: read-face-name PROMPT arg should be self-contained, including ": ", Drew Adams, 2007/03/19
- Re: read-face-name PROMPT arg should be self-contained, including ": ", Tamas Patrovics, 2007/03/19
- Re: read-face-name PROMPT arg should be self-contained, including ": ", Richard Stallman, 2007/03/19