GNU bug report logs - #65632
30.0.50; Proposal to improve `faces--attribute-at-point'.

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Package: emacs; Reported by: David Ponce <da_vid@HIDDEN>; Keywords: patch; dated Wed, 30 Aug 2023 18:06:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Added tag(s) patch. Request was from Stefan Kangas <stefankangas@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Subject: Re: bug#65632: 30.0.50; Proposal to improve
 `faces--attribute-at-point'.
From: David Ponce <da_vid@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
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On 31/08/2023 00:30, David Ponce wrote:
> On 30/08/2023 21:22, Eli Zaretskii wrote:
>>> Cc: 65632 <at> debbugs.gnu.org
>>> Date: Wed, 30 Aug 2023 21:35:11 +0300
>>> From: Eli Zaretskii <eliz@HIDDEN>
>>>
>>>> ;; Display "TEST" in red, bold, italic on yellow background.
>>>> (insert
>>>>    (propertize
>>>>     "TEST" 'font-lock-face
>>>>     '(bold ((:background "yellow") "italic"
>>>>             ((foreground-color . "red") underline)))))
>>>
>>> This is not a valid face, AFAIU.  That it works is sheer luck (because
>>> Emacs is very lenient with this stuff).  The correct face definition
>>> for what you want is this (see 'set-face-attribute's doc string):
>>>
>>>    (insert
>>>      (propertize
>>>       "TEST" 'font-lock-face
>>>       '(:weight bold :background "yellow" :slant italic
>>>          :foreground "red" :underline t)))
>>>
>>> If you use the above, foreground-color-at-point etc. will work as
>>> expected.
>>>
>>> I'm not sure we want to go out of our way to support the kind of face
>>> specifications that you used.
>>
>> However, if we do want that, we already have the technology:
>>
>>    (face-attributes-as-vector (get-char-property (point) 'font-lock-face))
>>
>> This will return a vector of face attribute values, where you can find
>> the value of any attribute you like.  For example, to get the
>> foreground color, evaluate:
>>
>>    (aref 9
>>      (face-attributes-as-vector (get-char-property (point) 'font-lock-face)))
> 
> Hi Eli,
> 
> Thank you very much for letting me know about `face-attributes-as-vector'
> (maybe its doc string could be improved?).  It is exactly the function I need :-)
> 
> In case you are interested, I attached an updated patch to faces.el that use
> this function to lookup face attribute, which improves and simplify  the
> functions `faces--attribute-at-point', `foreground-color-at-point' and
> `background-color-at-point'.
> 
> Regards

Please find attached a revised patch.  I used the name
`faces-attribute' instead of `face-attribute-lookup' for consistency
with `faces--attribute-at-point'.  I simplified this new function
because `face-attributes-as-vector' always returns the symbol
`unspecified' when an attribute is not specified (according to what I
understand of the implementation in xfaces.c).  I also improved the
doc string to include a link to the Elisp manual regarding the meaning
of face specification.

Here is an updated changelog:

	* faces.el: Improve attribute lookup of face at point.
	(face--attribute-index): New constant.
	(faces-attribute): New function.
	(faces--attribute-at-point): Use it.  Remove unused argument.
	(foreground-color-at-point)
	(background-color-at-point): Call accordingly.



Regards
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Subject: Re: bug#65632: 30.0.50; Proposal to improve
 `faces--attribute-at-point'.
To: Eli Zaretskii <eliz@HIDDEN>
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On 30/08/2023 21:22, Eli Zaretskii wrote:
>> Cc: 65632 <at> debbugs.gnu.org
>> Date: Wed, 30 Aug 2023 21:35:11 +0300
>> From: Eli Zaretskii <eliz@HIDDEN>
>>
>>> ;; Display "TEST" in red, bold, italic on yellow background.
>>> (insert
>>>    (propertize
>>>     "TEST" 'font-lock-face
>>>     '(bold ((:background "yellow") "italic"
>>>             ((foreground-color . "red") underline)))))
>>
>> This is not a valid face, AFAIU.  That it works is sheer luck (because
>> Emacs is very lenient with this stuff).  The correct face definition
>> for what you want is this (see 'set-face-attribute's doc string):
>>
>>    (insert
>>      (propertize
>>       "TEST" 'font-lock-face
>>       '(:weight bold :background "yellow" :slant italic
>> 	     :foreground "red" :underline t)))
>>
>> If you use the above, foreground-color-at-point etc. will work as
>> expected.
>>
>> I'm not sure we want to go out of our way to support the kind of face
>> specifications that you used.
> 
> However, if we do want that, we already have the technology:
> 
>    (face-attributes-as-vector (get-char-property (point) 'font-lock-face))
> 
> This will return a vector of face attribute values, where you can find
> the value of any attribute you like.  For example, to get the
> foreground color, evaluate:
> 
>    (aref 9
>      (face-attributes-as-vector (get-char-property (point) 'font-lock-face)))

Hi Eli,

Thank you very much for letting me know about `face-attributes-as-vector'
(maybe its doc string could be improved?).  It is exactly the function I need :-)

In case you are interested, I attached an updated patch to faces.el that use
this function to lookup face attribute, which improves and simplify  the
functions `faces--attribute-at-point', `foreground-color-at-point' and
`background-color-at-point'.

Regards
--------------jc9jmD4ZSu4eEvrewgb9RJsw
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--------------jc9jmD4ZSu4eEvrewgb9RJsw--
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#65632; Package emacs. Full text available.

Message received at 65632 <at> debbugs.gnu.org:


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Date: Wed, 30 Aug 2023 22:22:50 +0300
Message-Id: <83h6ogfi7p.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: da_vid@HIDDEN
In-Reply-To: <83jztcfkf4.fsf@HIDDEN> (message from Eli Zaretskii on Wed, 30
 Aug 2023 21:35:11 +0300)
Subject: Re: bug#65632: 30.0.50;
 Proposal to improve `faces--attribute-at-point'.
References: <c4b4dd2c-03ea-df8c-11b1-e899081e811b@HIDDEN>
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> Cc: 65632 <at> debbugs.gnu.org
> Date: Wed, 30 Aug 2023 21:35:11 +0300
> From: Eli Zaretskii <eliz@HIDDEN>
> 
> > ;; Display "TEST" in red, bold, italic on yellow background.
> > (insert
> >   (propertize
> >    "TEST" 'font-lock-face
> >    '(bold ((:background "yellow") "italic"
> >            ((foreground-color . "red") underline)))))
> 
> This is not a valid face, AFAIU.  That it works is sheer luck (because
> Emacs is very lenient with this stuff).  The correct face definition
> for what you want is this (see 'set-face-attribute's doc string):
> 
>   (insert
>     (propertize
>      "TEST" 'font-lock-face
>      '(:weight bold :background "yellow" :slant italic
> 	     :foreground "red" :underline t)))
> 
> If you use the above, foreground-color-at-point etc. will work as
> expected.
> 
> I'm not sure we want to go out of our way to support the kind of face
> specifications that you used.

However, if we do want that, we already have the technology:

  (face-attributes-as-vector (get-char-property (point) 'font-lock-face))

This will return a vector of face attribute values, where you can find
the value of any attribute you like.  For example, to get the
foreground color, evaluate:

  (aref 9
    (face-attributes-as-vector (get-char-property (point) 'font-lock-face)))
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#65632; Package emacs. Full text available.

Message received at 65632 <at> debbugs.gnu.org:


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Date: Wed, 30 Aug 2023 21:35:11 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
To: David Ponce <da_vid@HIDDEN>
In-Reply-To: <c4b4dd2c-03ea-df8c-11b1-e899081e811b@HIDDEN> (message from
 David Ponce on Wed, 30 Aug 2023 20:04:49 +0200)
Subject: Re: bug#65632: 30.0.50;
 Proposal to improve `faces--attribute-at-point'.
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> Date: Wed, 30 Aug 2023 20:04:49 +0200
> From: David Ponce <da_vid@HIDDEN>
> 
> I noticed that the functions `foreground-color-at-point' and
> `background-color-at-point' don't return expected values when the face
> at point includes anonymous face or is a nested list of face, for
> example.
> 
> Here is a simple recipe that demonstrates the issue (emacs -Q):
> 
> In scratch buffer eval:
> -----------------------
> 
> ;; Display "TEST" in red, bold, italic on yellow background.
> (insert
>   (propertize
>    "TEST" 'font-lock-face
>    '(bold ((:background "yellow") "italic"
>            ((foreground-color . "red") underline)))))

This is not a valid face, AFAIU.  That it works is sheer luck (because
Emacs is very lenient with this stuff).  The correct face definition
for what you want is this (see 'set-face-attribute's doc string):

  (insert
    (propertize
     "TEST" 'font-lock-face
     '(:weight bold :background "yellow" :slant italic
	     :foreground "red" :underline t)))

If you use the above, foreground-color-at-point etc. will work as
expected.

I'm not sure we want to go out of our way to support the kind of face
specifications that you used.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#65632; Package emacs. Full text available.

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From: David Ponce <da_vid@HIDDEN>
Subject: 30.0.50; Proposal to improve `faces--attribute-at-point'.
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This is a multi-part message in MIME format.
--------------JJEk5aKF1BTWenVZT0IQreZv
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit

Hello,

I noticed that the functions `foreground-color-at-point' and
`background-color-at-point' don't return expected values when the face
at point includes anonymous face or is a nested list of face, for
example.

Here is a simple recipe that demonstrates the issue (emacs -Q):

In scratch buffer eval:
-----------------------

;; Display "TEST" in red, bold, italic on yellow background.
(insert
  (propertize
   "TEST" 'font-lock-face
   '(bold ((:background "yellow") "italic"
           ((foreground-color . "red") underline)))))
TESTnil

;; Then click to move point somewhere on TEST and run
M-: (foreground-color-at-point) RET
>>> result is "black" instead of "red"
M-: (background-color-at-point) RET
>>> result is "white" instead of "yellow"

I propose the attached patch to faces.el to improve things.
The patch introduce a new function `face-attribute-lookup' to lookup
face attribute, that works when face specification is complex like in
above example.  The function `faces--attribute-at-point' is simplified
to use it.

Here is a possible changelog:

	* faces.el: Improve attribute lookup of face at point.
	(face--unnamed-attributes): New constant.
	(face--attribute-unspecified-p)
	(face-attribute-lookup): New functions.
	(faces--attribute-at-point): Use it.  Remove useless argument.
	(foreground-color-at-point)
	(background-color-at-point): Update accordingly.

Thanks
--------------JJEk5aKF1BTWenVZT0IQreZv
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--------------JJEk5aKF1BTWenVZT0IQreZv--
Acknowledgement sent to David Ponce <da_vid@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#65632; Package emacs. Full text available.
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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.