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RE: [External] : Re: completing-read depricated initial-input
From: |
Drew Adams |
Subject: |
RE: [External] : Re: completing-read depricated initial-input |
Date: |
Thu, 23 Jun 2022 16:30:01 +0000 |
> > (let ((list '("iffalse" "iftrue" "else" "fi")))
> > (completing-read "Macro: "
> > (mapcar (lambda (x) (concat "\\" x)) list)
> > nil nil "\\"))
>
> A convincing example, in my opinion.
Yes, it's a typical use case for non-nil INIT
arg: inserting a prefix.
And it's also essentially the case for non-nil
`insert-default-directory' for `read-file-name'.
(Try setting `insert-default-directory' to nil,
and see if you like it. Now imagine if Emacs
hard-coded the behavior as nil and decided to
tell users that inserting `default-directory'
is deprecated...)
This case can arise if you use `try-completion'
to obtain such a common prefix, and then you use
`completing-read' to get the completion the user
wants.
Another example:
(completing-read "Color: " (defined-colors)
nil nil (buffer-substring-no-properties
(widget-field-start widget)
(point)))
___
Another typical use case is when the HIST arg is a
cons, so you can insert a particular history element
and position the cursor after it.
This case is what the doc string of `completing-read'
(misguidedly) says is the _only_ use case:
(This is the only case in which you should use
INITIAL-INPUT instead of DEF.)
(Our docs shouldn't use "should", BTW. ;-))
And it's not even necessarily a case of "instead
of DEF". Using INIT here doesn't exclude also
using a DEF value.
- RE: standard libraries again (was: Re: [External] : Re: completing-read depricated initial-input), (continued)
- Re: completing-read depricated initial-input, Arash Esbati, 2022/06/23
- Re: completing-read depricated initial-input, carlmarcos, 2022/06/23
- Re: completing-read depricated initial-input, Emanuel Berg, 2022/06/23
- Re: completing-read depricated initial-input, Michael Heerdegen, 2022/06/23
- Re: completing-read depricated initial-input, Arash Esbati, 2022/06/23
- Re: completing-read depricated initial-input, Michael Heerdegen, 2022/06/23
- RE: [External] : Re: completing-read depricated initial-input,
Drew Adams <=
- Re: [External] : Re: completing-read depricated initial-input, Michael Heerdegen, 2022/06/23
- Re: [External] : Re: completing-read depricated initial-input, Christopher Dimech, 2022/06/23
- Re: [External] : Re: completing-read depricated initial-input, Emanuel Berg, 2022/06/23
- Re: RE: [External] : completing-read depricated initial-input, Christopher Dimech, 2022/06/23
- Re: [External] : Re: completing-read depricated initial-input, Emanuel Berg, 2022/06/23
- Re: completing-read depricated initial-input, Emanuel Berg, 2022/06/23
- Re: completing-read depricated initial-input, Emanuel Berg, 2022/06/23
- Re: completing-read depricated initial-input, Stefan Monnier, 2022/06/23
- Re: completing-read depricated initial-input, Christopher Dimech, 2022/06/23
- Re: completing-read depricated initial-input, Stefan Monnier, 2022/06/23