Re: Interactive function displaying face attributes

[carlmarcos--- via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>]

Aug 9, 2022, 18:59 by eliz@gnu.org:

>> Date: Tue, 9 Aug 2022 20:53:32 +0200 (CEST)
>> From: carlmarcos@tutanota.com
>> Cc: help-gnu-emacs@gnu.org
>>
>> Aug 9, 2022, 18:33 by eliz@gnu.org:
>>
>> >> Date: Tue, 9 Aug 2022 20:24:21 +0200 (CEST)
>> >> From: carlmarcos--- via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>
>> >>
>> >>
>> >> I am writing this function to display face attributes.  The function works interactively accepting a string from the user obtained from `completing-read'.
>> >>
>> >
>> > What is that string?  If it's a face, then we already have
>> > describe-face.
>> >
>> The string is an element in the list passed in completing-read.
>>
>
> And what are the members of that list?  Are they faces?
>
They are strings telling users what faces to display.  Would need some call to intern
in the function body for some options (e.g. mode-line) when calling the appropriate function.

> IOW, do you want a function that displays attributes of a face?  If
> so, describe-face is your friend.
>
Yes, I have been using `describe-face' on `mode-line' and `mode-line-inactive'.

What about face after point?  What could I call?  Same `describe-face'?  And what would be the correct face name?

>> >> For `char-after-point' I want to display the face attribute of the
>> >> character after point.
>> >>
>> >
>> > Did you try "M-x describe-text-properties"?
>> >
>> No, have done `describe-face'
>>
>
> Well, how about trying describe-text-properties?
>
>> >> Having seen that there can be more than one face at point, what can I do?
>> >>
>> > No, the face at a given buffer position can have only one value.
>> >
>> If `hl-line-mode' is enabled, would that result in multiple faces at point?
>>
>
> No, there's just one.  But there might be other sources of face
> information besides the buffer text itself.  See the node "Displaying
> Faces" in the ELisp manual.  (Btw, describe-text-properties will show
> the other sources of face information as well.)
>