global-font-lock-mode-check-buffers: What does it do?

global-font-lock-mode-check-buffers: What does it do?

[raman]

I see that global-font-lock-mode-check-buffers is present in
post-command-hook  -- that function appears to get defined
automagically in font-core.el - at least that's where find-function
jumps when asked about that function. It's present in the .elc file,
but not in font-core.el so I guess it's getting generated through a
macro call -- haven't found where though.
The function has no doc string.

Am looking to see what it does while trying to debug a problem with
Emacspeak's voice-lock in Info mode buffers.

Background:

emacspeak attaches property 'personality to match  Emacs' font-locking
to produce audio-formatted output. It works everywhere but has stopped
working in Info buffers:

1. When I open an Info node for the first time, voice-lock is applied
correctly and I hear all the voice changes.

2. Subsequently -- if I perform any command in that displayed info
buffer -- including C-n for moving by line, the personality properties
disappear -- the face properties are present.

3. If I move to another node that hasn't been displayed, I hear the
effects of voice-lock -- returning to the previously displayed node
shows the voice properties to be still missing.

Am suspecting post-command-hook as   a possible place where something
might be going wrong since the voice properties disappear the moment I
interact with the Info buffer.
-- 

-- 

Re: global-font-lock-mode-check-buffers: What does it do?

[Stefan Monnier]

> I see that global-font-lock-mode-check-buffers is present in
> post-command-hook  -- that function appears to get defined
> automagically in font-core.el

It's defined by the call to define-globalized-minor-mode.


        Stefan

Re: global-font-lock-mode-check-buffers: What does it do?

[T.V Raman]

But I still cant tell what it does after looking at the code where it
is generated. Also, why is it placed on post-command-hook -- given
that jit-lock is already attached to after-change-functions?

Stefan Monnier writes:
 > > I see that global-font-lock-mode-check-buffers is present in
 > > post-command-hook  -- that function appears to get defined
 > > automagically in font-core.el
 > 
 > It's defined by the call to define-globalized-minor-mode.
 > 
 > 
 >         Stefan

-- 

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Re: global-font-lock-mode-check-buffers: What does it do?

[Stefan Monnier]

> But I still cant tell what it does after looking at the code where it
> is generated. Also, why is it placed on post-command-hook -- given
> that jit-lock is already attached to after-change-functions?

As mentioned, it's created by define-globalized-minor-mode, i.e. code
which works for any minor mode.  It knows nothing about jit-lock's
own hooks.

What it does is check whether some newly created buffer might need
font-lock enabled.


        Stefan


> Stefan Monnier writes:
>> > I see that global-font-lock-mode-check-buffers is present in
>> > post-command-hook  -- that function appears to get defined
>> > automagically in font-core.el
>> 
>> It's defined by the call to define-globalized-minor-mode.
>> 
>> 
>> Stefan

> -- 

> --