bug#33007: 27.0.50; Proposal for function to edit and return string

[Juri Linkov]

>> One thing I found: at the end of `string-edit', you have
>>
>> #+begin_src emacs-lisp
>> (message "%S" (substitute-command-keys
>>                  "Type `C-c C-c' when you've finished editing"))
>> #+end_src
>>
>> That should be "%s" - we don't want a quoted, `read'able string
>> messaged.
>
> Yup; fixed now (and I made it use the \[...] thing at the same time).

Another problem is that currently the message doesn't say how
to abort changes:

  Type C-c C-c when you’ve finished editing

whereas for example the message in Wdired is:

  Press C-c C-c when finished or C-c ESC to abort changes

>> Second: I find the name of `read-string-from-buffer' a bit misleading -
>> what about `edit-string-in-buffer'?  The emphasis should be on "edit",
>> because a string is already present, the function doesn't just prompt
>> for a (new) string.
>
> Yes, I was waffling between various names while I was typing the file,
> and renamed the function to read-string-from-buffer while writing the
> documentation.  :-)  I thought it might make sense from a discovery
> point of view to have something that people who looked for `read-string'
> would find easily (and could plug into existing functions easily).
>
> But this function will probably mostly be used for editing strings, as
> you point out, so `edit-string-in-buffer' sounds like a good idea to me.
> Anybody have any further opinions before I rename?

I think read-string-from-buffer is already a nice name,
and when its default is empty string, then it really reads
a new string from scratch.

Also it would be nicer to pop up its buffer under the current window
(need to play with display-buffer parameters), and a good example
is display-buffer-below-selected (e.g. as used in dired-mark-pop-up).