GNU bug report logs - #19720
24.4; minor mode's font-lock-add-keywords & auto-mode-alist problem

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

From: Joost Kremers <joostkremers <at> fastmail.fm>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.4; minor mode's font-lock-add-keywords & auto-mode-alist problem
Date: Wed, 28 Jan 2015 23:55:04 +0100

Font lock keywords added with `font-lock-add-keywords' in a minor mode's
activation function do not work when the minor mode is activated in a
major mode's hook and the major mode is activated through an entry in
`auto-mode-alist'. They work fine if the major mode is activated
manually (i.e., with `M-x <major-mode>').

I discovered the problem when I added font lock keywords to
`pandoc-mode` and opened a Markdown file. `pandoc-mode' is a minor mode
that I activate in `markdown-mode-hook'.

I haven't tested it with other major/minor modes, therefore I can't be
sure if it's related to either `markdown-mode' or `pandoc-mode', or if
it's a general problem.

Recipe to reproduce:

- Start Emacs with `emacs -Q'
- load `markdown-mode.el' (from http://jblevins.org/projects/markdown-mode/markdown-mode.el )
- load `pandoc-mode.el' (from https://github.com/joostkremers/pandoc-mode )
- (add-hook 'markdown-mode-hook 'pandoc-mode)
- (add-to-list 'auto-mode-alist '("\\.text\\'" . markdown-mode))
- save the following text as `sample.text' and open:

====================

This is a simple Markdown test file. It contains a citation
[@Chomsky1995], a Pandoc-specific Markdown extension. The citation
should be fontified, but this does not happens when `markdown-mode' is
activated through `auto-mode-alist'. To make sure the file is fontified,
*this* should be in _italic_ and __this__ in **boldface**.

====================

As stated, the citation `[@Chomsky1995]' should be fontified, but when
the file is first opened, it is not.

Note that `pandoc-mode' *is* active (all other functionality works) and
that right after the call to `font-lock-add-keywords' in `pandoc-mode'
(`pandoc-faces-load', to be exact), the buffer-local value of
`font-lock-keywords' *does* contain the new keywords. (I tested this by
assigning the value of `font-lock-keywords' to another variable right
after the call to `font-lock-add-keywords'.) For some reason, however,
the keywords are removed again, because when Emacs has finished opening
the file, `C-h v font-lock-keywords' only shows the keywords added by
`markdown-mode', not those added by `pandoc-mode'.

When `markdown-mode' is activated with `M-x markdown-mode', the
font-lock keywords that `pandoc-mode' adds work: the relevant elements
are fontified and `C-h v font-lock-keywords' shows that the keywords are
there.







in GNU Emacs 24.4.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.4.2)
 of 2014-10-22 on IdeaPad
Windowing system distributor `The X.Org Foundation', version 11.0.11501000
System Description:	elementary OS Luna

Important settings:
  value of $LC_MONETARY: en_IE.UTF-8
  value of $LC_NUMERIC: en_IE.UTF-8
  value of $LC_TIME: en_IE.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: EShell

Minor modes in effect:
  TeX-PDF-mode: t
  shell-dirtrack-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  global-edit-server-edit-mode: t
  ido-vertical-mode: t
  global-auto-complete-mode: t
  pyvenv-mode: t
  guide-key-mode: t
  global-aggressive-indent-mode: t
  autopair-global-mode: t
  autopair-mode: t
  global-visual-fill-column-mode: t
  show-paren-mode: t
  ido-everywhere: t
  delete-selection-mode: t
  override-global-mode: t
  tooltip-mode: t
  mouse-wheel-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
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
. p y <tab> <kp-home> n n n n n n n n - x y p R S <backspace> 
l i e b e SPC r <backspace> F r a u M-b M-b M-c C-e 
SPC G e r n e r t , <return> <return> <return> C-t 
e n t s c h u l d i g e n SPC n i e <M-backspace> S 
i e SPC b i t t e SPC d i e SPC s p ' a t e <M-backspace> 
<backspace> SPC s p " a t e SPC <M-backspace> <backspace> 
C-\ " a t e SPC A n t w o r t . SPC H a t SPC e m i 
n <M-backspace> m e i n e SPC E m a i l SPC v o n SPC 
l e t z t e r SPC W o c h e SPC a l l e SPC I h r e 
SPC F r a g e n SPC b e a n t w o r t e t M-b M-b M-b 
<M-backspace> C-e , o d <backspace> <backspace> SPC 
o d e r SPC <return> <return> C-t C-b s i n d SPC s 
<backspace> n o c h SPC F r a g e n SPC o f f e n SPC 
g e b l i e b e n ? <return> <return> m f g <tab> C-c 
C-c o c l <tab> . p y <tab> y m o c l <tab> . p y <tab> 
q b u n n n n n n n n D q G <C-tab> s-m U b u D D <return> 
q D q z c d <return> M-x r e p o r t <tab> <return
>

Recent messages:
[mu4e] Retrieving mail...done
[mu4e] Indexing... processed 30000, updated 8
[mu4e] Indexing completed; processed 30216, updated 8, cleaned-up 4
[mu4e] Contacts received: 4678
[mu4e] Retrieving mail...done
[mu4e] Indexing... processed 30000, updated 4
[mu4e] Indexing completed; processed 30217, updated 4, cleaned-up 2
[mu4e] Contacts received: 4678
[mu4e] mu4e-main-mode
[mu4e] Found 32 matching messages

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ansi-color ring yasnippet help-mode cl gv windmove swbuff-jk swbuff
smart-mode-line-respectful-theme rich-minority smart-mode-line mule-util
dash visual-fill-column server edmacro kmacro cl-loaddefs cl-lib paren
ido delsel cus-start cus-load adaptive-wrap-autoloads tex-site advice
help-fns info easymenu package epg-config bind-key easy-mmode time-date
tooltip electric uniquify ediff-hook vc-hooks lisp-float-type mwheel
x-win x-dnd tool-bar dnd fontset image regexp-opt fringe tabulated-list
newcomment lisp-mode prog-mode register page menu-bar rfn-eshadow timer
select scroll-bar 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 minibuffer nadvice loaddefs button faces cus-face macroexp
files text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
dbusbind gfilenotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:
((conses 16 749602 67603)
 (symbols 48 53753 0)
 (miscs 40 4968 8773)
 (strings 32 162236 29282)
 (string-bytes 1 4424883)
 (vectors 16 78290)
 (vector-slots 8 1973759 149184)
 (floats 8 1419 1415)
 (intervals 56 26254 4869)
 (buffers 960 60)
 (heap 1024 80290 20455))

-- 
Joost Kremers
Life has its moments

Message #8 received at 19720 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Joost Kremers <joostkremers <at> fastmail.fm>
Cc: 19720 <at> debbugs.gnu.org
Subject: Re: bug#19720: 24.4;
 minor mode's font-lock-add-keywords & auto-mode-alist problem
Date: Wed, 28 Jan 2015 21:42:40 -0500

Joost Kremers wrote:

> Font lock keywords added with `font-lock-add-keywords' in a minor mode's
> activation function do not work when the minor mode is activated in a
> major mode's hook and the major mode is activated through an entry in
> `auto-mode-alist'.

The minimal example works fine:

emacs-24.4 -Q -l foo.el foo.txt

where foo.el has contents:

  (define-minor-mode foobar-mode "blah" :initial-value nil
    (font-lock-add-keywords nil '(("foobar" . 'font-lock-warning-face))))

  (add-hook 'text-mode-hook 'foobar-mode)

and foo.txt contains:

  foobar

foobar gets font-lock-warning-face.

So your problem may be specific to your specific modes.

Message #11 received at 19720 <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dgutov <at> yandex.ru>
To: Glenn Morris <rgm <at> gnu.org>,
 Joost Kremers <joostkremers <at> fastmail.fm>
Cc: 19720 <at> debbugs.gnu.org
Subject: Re: bug#19720: 24.4; minor mode's font-lock-add-keywords &
 auto-mode-alist problem
Date: Thu, 29 Jan 2015 05:14:24 +0200

On 01/29/2015 04:42 AM, Glenn Morris wrote:

>    (add-hook 'text-mode-hook 'foobar-mode)

I think we need a better example: text-mode doesn't even set 
font-lock-keywords.

Message #14 received at 19720 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Dmitry Gutov <dgutov <at> yandex.ru>
Cc: Joost Kremers <joostkremers <at> fastmail.fm>, 19720 <at> debbugs.gnu.org
Subject: Re: bug#19720: 24.4;
 minor mode's font-lock-add-keywords & auto-mode-alist problem
Date: Wed, 28 Jan 2015 22:59:14 -0500

Dmitry Gutov wrote:

> On 01/29/2015 04:42 AM, Glenn Morris wrote:
>
>>    (add-hook 'text-mode-hook 'foobar-mode)
>
> I think we need a better example: text-mode doesn't even set
> font-lock-keywords.

s/text/f90

same result.

Message #17 received at 19720 <at> debbugs.gnu.org (full text, mbox):

From: Joost Kremers <joostkremers <at> fastmail.fm>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 19720 <at> debbugs.gnu.org, Dmitry Gutov <dgutov <at> yandex.ru>
Subject: Re: bug#19720: 24.4;
 minor mode's font-lock-add-keywords & auto-mode-alist problem
Date: Thu, 29 Jan 2015 07:42:23 +0100

On Thu, Jan 29 2015, Glenn Morris <rgm <at> gnu.org> wrote:
> Dmitry Gutov wrote:
>
>> On 01/29/2015 04:42 AM, Glenn Morris wrote:
>>
>>>    (add-hook 'text-mode-hook 'foobar-mode)
>>
>> I think we need a better example: text-mode doesn't even set
>> font-lock-keywords.
>
> s/text/f90
>
> same result.

Yup. Looks like it's a problem with `markdown-mode'.

Sorry for the noise.


-- 
Joost Kremers
Life has its moments

Message #20 received at 19720 <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dgutov <at> yandex.ru>
To: Joost Kremers <joostkremers <at> fastmail.fm>,
 Glenn Morris <rgm <at> gnu.org>
Cc: 19720 <at> debbugs.gnu.org
Subject: Re: bug#19720: 24.4; minor mode's font-lock-add-keywords &
 auto-mode-alist problem
Date: Thu, 29 Jan 2015 12:11:52 +0200

On 01/29/2015 08:42 AM, Joost Kremers wrote:

> Yup. Looks like it's a problem with `markdown-mode'.

But what kind of problem?

Message #23 received at 19720 <at> debbugs.gnu.org (full text, mbox):

From: Joost Kremers <joostkremers <at> fastmail.fm>
To: Dmitry Gutov <dgutov <at> yandex.ru>
Cc: 19720 <at> debbugs.gnu.org
Subject: Re: bug#19720: 24.4;
 minor mode's font-lock-add-keywords & auto-mode-alist problem
Date: Thu, 29 Jan 2015 12:11:16 +0100

On Thu, Jan 29 2015, Dmitry Gutov <dgutov <at> yandex.ru> wrote:
> On 01/29/2015 08:42 AM, Joost Kremers wrote:
>
>> Yup. Looks like it's a problem with `markdown-mode'.
>
> But what kind of problem?

I've been trying to figure that out, but haven't gotten very far yet.
I'm no expert on font-lock and I can't really tell if `markdown-mode'
does anything out of the ordinary with it.

I'll take this back to gnu.emacs.help and also send the maintainer of
`markdown-mode' an email. Perhaps he can shed some light on this.

-- 
Joost Kremers
Life has its moments

Message #26 received at 19720 <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dgutov <at> yandex.ru>
To: Joost Kremers <joostkremers <at> fastmail.fm>
Cc: 19720 <at> debbugs.gnu.org
Subject: Re: bug#19720: 24.4; minor mode's font-lock-add-keywords &
 auto-mode-alist problem
Date: Thu, 29 Jan 2015 13:36:41 +0200

On 01/29/2015 01:11 PM, Joost Kremers wrote:

> I've been trying to figure that out, but haven't gotten very far yet.
> I'm no expert on font-lock and I can't really tell if `markdown-mode'
> does anything out of the ordinary with it.
>
> I'll take this back to gnu.emacs.help and also send the maintainer of
> `markdown-mode' an email. Perhaps he can shed some light on this.

Looks like the problem is that `markdown-reload-extensions', which is 
called from `markdown-mode', not only sets `font-lock-defaults', but 
also calls `font-lock-refresh-defaults'.

This function is also added to `hack-local-variables-hook'.

Message #29 received at 19720 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Dmitry Gutov <dgutov <at> yandex.ru>
Cc: Joost Kremers <joostkremers <at> fastmail.fm>, 19720 <at> debbugs.gnu.org
Subject: Re: bug#19720: 24.4;
 minor mode's font-lock-add-keywords & auto-mode-alist problem
Date: Thu, 29 Jan 2015 10:12:54 -0500

> Looks like the problem is that `markdown-reload-extensions', which is called
> from `markdown-mode', not only sets `font-lock-defaults', but also calls
> `font-lock-refresh-defaults'.

FWIW, I think part of the problem is that there's no way to "reset
font-lock-keywords" without throwing away all the keywords added via
font-lock-add-keywords.


        Stefan

Message #32 received at 19720 <at> debbugs.gnu.org (full text, mbox):

From: Joost Kremers <joostkremers <at> fastmail.fm>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 19720 <at> debbugs.gnu.org, Dmitry Gutov <dgutov <at> yandex.ru>
Subject: Re: bug#19720: 24.4;
 minor mode's font-lock-add-keywords & auto-mode-alist problem
Date: Fri, 30 Jan 2015 17:59:57 +0100

On Thu, Jan 29 2015, Stefan Monnier <monnier <at> IRO.UMontreal.CA> wrote:
>> Looks like the problem is that `markdown-reload-extensions', which is called
>> from `markdown-mode', not only sets `font-lock-defaults', but also calls
>> `font-lock-refresh-defaults'.
>
> FWIW, I think part of the problem is that there's no way to "reset
> font-lock-keywords" without throwing away all the keywords added via
> font-lock-add-keywords.

But why does it only happen when the mode is set through an entry in
`auto-mode-alist' and not when I activate `markdown-mode' myself with
`M-x markdown-mode'? 

-- 
Joost Kremers
Life has its moments

Message #35 received at 19720 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Joost Kremers <joostkremers <at> fastmail.fm>
Cc: 19720 <at> debbugs.gnu.org, Dmitry Gutov <dgutov <at> yandex.ru>
Subject: Re: bug#19720: 24.4; minor mode's font-lock-add-keywords &
 auto-mode-alist problem
Date: Wed, 30 Oct 2019 16:51:30 +0100

Joost Kremers <joostkremers <at> fastmail.fm> writes:

> I've been trying to figure that out, but haven't gotten very far yet.
> I'm no expert on font-lock and I can't really tell if `markdown-mode'
> does anything out of the ordinary with it.
>
> I'll take this back to gnu.emacs.help and also send the maintainer of
> `markdown-mode' an email. Perhaps he can shed some light on this.

This seems to be a problem in markdown-mode (which is an external
package), and not in Emacs, so I'm closing this bug report.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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