GNU bug report logs - #6767
24.0.50; face-all-attributes returns unspecified for everything

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Jan Djärv <jan.h.d <at> swipnet.se>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.0.50; face-all-attributes returns unspecified for everything
Date: Sat, 31 Jul 2010 11:36:52 +0200

This bug report will be sent to the Free Software Foundation,
not to your local site managers!
Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the bug-gnu-emacs <at> gnu.org mailing list,
and to the gnu.emacs.bug news group.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug.  If you can, give
a recipe starting from `emacs -Q':

In *scratch*:
(face-attribute 'italic :slant)
italic ;; Good.

(face-italic-p 'italic)
(italic oblique) ;; Fine.

(assq :slant (face-all-attributes 'italic))
(:slant . unspecified) ;; Say what??

In fact face-all-attributes gives me unspecified for all attributes in
the faces I tried (about 5), including the default face.

Did I misunderstand how face-all-attributes work?

    Jan D.


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In GNU Emacs 24.0.50.2 (x86_64-apple-darwin10.4.0, NS apple-appkit-1038.32)
 of 2010-07-20 on zeplin
Windowing system distributor `Apple', version 10.3.1038
configured using `configure  '--verbose' '--enable-asserts' '--with-ns' 
'--without-x' 'CFLAGS=-g''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: C
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: sv_SE.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<down-mouse-1> <mouse-1> ( f a c e - a t t r i b u
t e SPC ' i t a l i c SPC : s l a n t ) C-j ( f a c
e - i t a l i c - p SPC ' i t a l i c ) C-j ( a s s
q SPC : s l a n t SPC ( f a c e - a l l - a t t r i
b u t e s SPC ' i t a l i c ) ) C-j ( f a c e - a l
l - a t t r i b u t e s SPC ' i t a l i c ) C-j <escape>
x r e p o r t - e m <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr message rfc822 mml mml-sec mm-decode
mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mailabbrev mail-utils gmm-utils mailheader emacsbug
tooltip ediff-hook vc-hooks lisp-float-type mwheel ns-win easymenu
tool-bar dnd fontset image fringe lisp-mode register page menu-bar
rfn-eshadow timer select scroll-bar mldrag mouse jit-lock font-lock
syntax facemenu font-core frame cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev loaddefs button
minibuffer faces cus-face files text-properties overlay md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process ns multi-tty emacs)

Message #8 received at 6767 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Jan Djärv <jan.h.d <at> swipnet.se>
Cc: 6767 <at> debbugs.gnu.org
Subject: Re: bug#6767: 24.0.50;
	face-all-attributes returns unspecified for everything
Date: Sat, 31 Jul 2010 14:11:27 +0300

> Date: Sat, 31 Jul 2010 11:36:52 +0200
> From: Jan Djärv <jan.h.d <at> swipnet.se>
> Cc: 
> 
> In *scratch*:
> (face-attribute 'italic :slant)
> italic ;; Good.
> 
> (face-italic-p 'italic)
> (italic oblique) ;; Fine.
> 
> (assq :slant (face-all-attributes 'italic))
> (:slant . unspecified) ;; Say what??
> 
> In fact face-all-attributes gives me unspecified for all attributes in
> the faces I tried (about 5), including the default face.

This happens because face-new-frame-defaults has `unspecified' for all
the attributes of `italic' face (and all other faces as well).  Try

  (face-all-attributes 'italic (selected-frame))

and you will get what you expect.

> Did I misunderstand how face-all-attributes work?

I don't know, but it sounds like the doc string is at least misleading
in this regard.  OTOH, this function is not used anywhere in Emacs, so
it could be buggy.

What is your use-case, exactly?

Message #11 received at 6767 <at> debbugs.gnu.org (full text, mbox):

From: Jan Djärv <jan.h.d <at> swipnet.se>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 6767 <at> debbugs.gnu.org
Subject: Re: bug#6767: 24.0.50;	face-all-attributes returns unspecified for
	everything
Date: Sat, 31 Jul 2010 15:22:03 +0200

Eli Zaretskii skrev 2010-07-31 13.11:
>> Date: Sat, 31 Jul 2010 11:36:52 +0200
>> From: Jan Djärv<jan.h.d <at> swipnet.se>
>> Cc:
>>
>> In *scratch*:
>> (face-attribute 'italic :slant)
>> italic ;; Good.
>>
>> (face-italic-p 'italic)
>> (italic oblique) ;; Fine.
>>
>> (assq :slant (face-all-attributes 'italic))
>> (:slant . unspecified) ;; Say what??
>>
>> In fact face-all-attributes gives me unspecified for all attributes in
>> the faces I tried (about 5), including the default face.
>
> This happens because face-new-frame-defaults has `unspecified' for all
> the attributes of `italic' face (and all other faces as well).  Try
>
>    (face-all-attributes 'italic (selected-frame))
>
> and you will get what you expect.
>
>> Did I misunderstand how face-all-attributes work?
>
> I don't know, but it sounds like the doc string is at least misleading
> in this regard.  OTOH, this function is not used anywhere in Emacs, so
> it could be buggy.
>
> What is your use-case, exactly?

Just trying to get all attributes for a possible conversion to pango markup. 
I intend to use it for tooltips so Emacs can use the system tooltips instead 
of its own.  In principle it is possible to put properties on the tool tip 
string so I'm trying to handle that.  Maybe this is overkill, most toolstips 
in Emacs are straight strings, but I've seen bold and italic.  I can ask for 
specific attributes instead of using face-all-attributes.

An improvement for the documentation would be to refer to face-attribute and 
say that if frame is nil or omitted, face-attribute is called with frame 
argument t.

	Jan D.

Message #16 received at 6767-done <at> debbugs.gnu.org (full text, mbox):

From: Jan Djärv <jan.h.d <at> swipnet.se>
Cc: 6767-done <at> debbugs.gnu.org
Subject: Re: bug#6767: 24.0.50;	face-all-attributes returns unspecified for
	everything
Date: Sat, 31 Jul 2010 19:23:28 +0200

I made the function documentation more like the texinfo documentation.

	Jan D.

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