Eli Zaretskii <eliz@HIDDEN>
to control <at> debbugs.gnu.org.
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Date: Mon, 10 Jun 2024 15:55:57 +0300
Message-Id: <86tti17y8y.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Konstantin Kharlamov <Hi-Angel@HIDDEN>
In-Reply-To: <abcb0453868da407f23e412ad31f39b927186ae7.camel@HIDDEN>
(message from Konstantin Kharlamov on Mon, 10 Jun 2024 14:59:37 +0300)
Subject: Re: bug#71469: font-lock does not apply standard faces and their
descendants
References: <abcb0453868da407f23e412ad31f39b927186ae7.camel@HIDDEN>
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tags 71469 notabug
thanks
> From: Konstantin Kharlamov <Hi-Angel@HIDDEN>
> Date: Mon, 10 Jun 2024 14:59:37 +0300
>
> (defface test-face
> '((t (:inherit bold)))
> "Test face.")
>
> (define-derived-mode my-mode fundamental-mode "My Mode"
> "A minimal mode that highlights 'hello world' text."
> (font-lock-add-keywords nil '(("hello world" 0 test-face)))
From the ELisp manual:
Each element of ‘font-lock-keywords’ should have one of these forms:
[...]
‘(MATCHER . FACESPEC)’
In this kind of element, FACESPEC is an expression whose value
specifies the face to use for highlighting. In the simplest case,
FACESPEC is a Lisp variable (a symbol) whose value is a face name.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
IOW, there's a difference between a symbol of a variable whose value
is a face name, and that face name itself.
This works for me:
(defface test-face
'((t (:inherit bold)))
"Test face.")
(defvar test-face 'test-face
"Face name to use for My Mode.")
(define-derived-mode my-mode fundamental-mode "My Mode"
"A minimal mode that highlights 'hello world' text."
(font-lock-add-keywords nil '(("hello world" 0 test-face)))
(font-lock-flush))
(add-to-list 'auto-mode-alist (cons "test.txt" 'my-mode))
(provide 'my-mode)
bug-gnu-emacs@HIDDEN:bug#71469; Package emacs.
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Subject: [PATCH] Re: bug#71469: font-lock does not apply standard faces and
their descendants
From: Konstantin Kharlamov <Hi-Angel@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Date: Mon, 10 Jun 2024 16:41:53 +0300
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On Mon, 2024-06-10 at 15:55 +0300, Eli Zaretskii wrote:
> tags 71469 notabug
> thanks
>=20
> > From: Konstantin Kharlamov <Hi-Angel@HIDDEN>
> > Date: Mon, 10 Jun 2024 14:59:37 +0300
> >=20
> > =C2=A0=C2=A0=C2=A0=C2=A0 (defface test-face
> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 '((t (:inherit bold)))
> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 "Test face.")
> >=20
> > =C2=A0=C2=A0=C2=A0=C2=A0 (define-derived-mode my-mode fundamental-mode =
"My Mode"
> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 "A minimal mode that highlights 'h=
ello world' text."
> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (font-lock-add-keywords nil '(("he=
llo world" 0 test-face)))
>=20
> From the ELisp manual:
>=20
> =C2=A0=C2=A0 Each element of =E2=80=98font-lock-keywords=E2=80=99 should =
have one of these
> forms:
> =C2=A0=C2=A0 [...]
> =C2=A0 =E2=80=98(MATCHER . FACESPEC)=E2=80=99
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 In this kind of element, FACESPEC is=
an expression whose value
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 specifies the face to use for highli=
ghting.=C2=A0 In the simplest
> case,
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 FACESPEC is a Lisp variable (a symbo=
l) whose value is a face
> name.
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>=20
> IOW, there's a difference between a symbol of a variable whose value
> is a face name, and that face name itself.
>=20
> This works for me:
>=20
> =C2=A0 (defface test-face
> =C2=A0=C2=A0=C2=A0 '((t (:inherit bold)))
> =C2=A0=C2=A0=C2=A0 "Test face.")
> =C2=A0 (defvar test-face 'test-face
> =C2=A0=C2=A0=C2=A0 "Face name to use for My Mode.")
>=20
> =C2=A0 (define-derived-mode my-mode fundamental-mode "My Mode"
> =C2=A0=C2=A0=C2=A0 "A minimal mode that highlights 'hello world' text."
> =C2=A0=C2=A0=C2=A0 (font-lock-add-keywords nil '(("hello world" 0 test-fa=
ce)))
> =C2=A0=C2=A0=C2=A0 (font-lock-flush))
> =C2=A0 (add-to-list 'auto-mode-alist (cons "test.txt" 'my-mode))
> =C2=A0 (provide 'my-mode)
Ooh, I see, thank you! So using e.g. a `'test-face` also makes it work.
I'm wondering if it would be okay to mention such nuance in the
"standard faces" documentation, such as with the attached patch? I
think it would be really helpful, because the nuance of how it works is
not obvious at all (it would be much easier if none of the faces such
as font-lock-keyword-face, would be defining a variable). I've spent
for about an hour on this trying in different ways to make it work, and
I also think it wasn't the first time I stumbled upon this. Having the
"standard faces" mention that interaction nuance I think could be
helpful for people in the future.
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bug-gnu-emacs@HIDDEN:bug#71469; Package emacs.
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Subject: font-lock does not apply standard faces and their descendants
From: Konstantin Kharlamov <Hi-Angel@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Date: Mon, 10 Jun 2024 14:59:37 +0300
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While trying to add a face to a major mode I found that both standard
faces=C2=B9 and inherited ones are ignored completely.
In steps below I create a simple major mode and it uses an inherited
face, but face does not get applied. NOTE: if you replace the inherited
face with, for example, `font-lock-constant-face`, it will get
highlighted. I.e. the problem somehow bound to faces.
# Steps to reproduce
1. Create `test.el` file as follows:
(defface test-face
'((t (:inherit bold)))
"Test face.")
(define-derived-mode my-mode fundamental-mode "My Mode"
"A minimal mode that highlights 'hello world' text."
(font-lock-add-keywords nil '(("hello world" 0 test-face)))
(font-lock-flush))
(add-to-list 'auto-mode-alist (cons "test.txt" 'my-mode))
(provide 'my-mode)
And `test.txt` as follows:
=20
=3D=3D> hello world <=3D=3D
2. Launch Emacs as `emacs -Q -l test.el test.txt`
3. Put a caret over the word `hello` and evaluate M-x describe-char
## Expected
The description buffer mentions that `face` is `test-face`.
## Actual
There is no `face` property at all.
# Additional information
Versions tested: Emacs built from February master and a stable 29.3
The problem actually doesn't seem to be related to `defface`, because
passing `bold` to the `font-lock-add-keywords` had similarly no effect
for some reason. More likely it's related to the "standard faces".
1: https://www.gnu.org/software/emacs/manual/html_node/emacs/Standard-Faces=
.html
Konstantin Kharlamov <Hi-Angel@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#71469; Package emacs.
Full text available.
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