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Re: Question about completion behavior

From: Juri Linkov
Subject: Re: Question about completion behavior
Date: Sun, 13 Mar 2022 19:44:49 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (x86_64-pc-linux-gnu)

>> Maybe better to have the whole string with all text properties
>> as the default value of 'completion-header-text-property-list'
>> that then could be renamed to e.g. 'completion-header-string'?
> I don't know a simple way for creating a string with the properties in a
> single call.  We may need a sort of wrapper function that initializes
> the string and call set properties in a single call otherwise the user
> may need to do it manually... Something like:
> (defun make-text-with-properties (string properties)
>        (let ((out string))
>             (set-text-properties ...)
>             out))
> Any better idea?

Something like

  (defvar completion-header-format
    (propertize "%s possible completions:"
                'face 'shadow
                :help "Please select a completion")
    "Format of completion header.")

> The other detail is that there are 2 strings: "Possible completions are"
> and "There are no possible completions of what you have typed."

In case of no completions it will be formatted to: "0 possible completions".

>> Regarding 'completion-lazy-count': it would be even better to allow
>> customization of this format like in 'icomplete-matches-format'
>> that was recently added in 28.1.
> Probably the best is to join the two variables in
> completion-header-string and allow it to have a %s for a count... I will
> go in that way.
> Is it OK?

It's OK, like above.

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