GNU bug report logs - #60223
29.0.60; Improve how tree-sitter changes to treesit--font-lock-fast-mode

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

From: ronisbr <ronisbr <at> ronanarraes.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.60; Improve how tree-sitter changes to
 treesit--font-lock-fast-mode
Date: Tue, 20 Dec 2022 11:08:28 -0300

Hi!

First of all, this is my very first interaction with Emacs mailing list. 
I have
a problem in the tree-sitter module that leads to a bug (Emacs 29). 
Hence, I am
not even sure if this is the right place to report it.

treesit.el has a fast font-lock mode that is also used to avoid locking 
if some
a query is taking too long:

            ;; If for any query the query time is strangely long,
            ;; switch to fast mode (see comments above).
            (when (> (time-to-seconds (time-subtract end-time 
start-time))
                     0.01)
              (setq-local treesit--font-lock-fast-mode t))

When coding Julia major mode using tree-sitter
(https://github.com/ronisbr/julia-ts-mode/blob/main/julia-ts-mode.el), I 
found a
strange behavior in my setup (Doom Emacs) that is caused precisely by 
that
feature.

If I open this file together with Emacs (first initialization):

https://github.com/ronisbr/PrettyTables.jl/blob/master/src/print.jl

The file has almost no font decoration and 
`treesit--font-lock-fast-mode` is set
to t. If I manually set it to nil and recompute everything, the font 
locking
works perfectly again.

However, everything works as expected if I open any other Julia code 
before
opening that file (print.jl). In this case, 
`treesit--font-lock-fast-mode`
remains nil.

My guess is that due to something that might or might not be related to 
my
setup, the query is taking longer than the 0.01s if I open that file 
during the
initialization of Julia mode. It is caused by that enormous string used 
to
document the function that seems to slow down tree-sitter parsing. Thus, 
I think
it would be very important to have a variable to customize this time 
interval
depending on the situation.

Best regards,
Ronan Arraes

In GNU Emacs 29.0.60 (build 1, aarch64-apple-darwin22.2.0, NS
 appkit-2299.30 Version 13.1 (Build 22C65)) of 2022-12-19 built on
 Mac-Studio-de-Ronan.local
System Description:  macOS 13.1

Configured using:
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Features:
(shadow sort disp-table whitespace vc-hg evil-collection-vc-git vc-git
evil-collection-diff-mode diff-mode vc-svn vc vc-dispatcher project
flyspell-lazy ispell flyspell vi-tilde-fringe display-line-numbers
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epg rfc6068 epg-config gnus-util mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils time-date cursor-sensor
vertico-repeat evil-collection-which-key which-key savehist
better-jumper company-capf company evil-collection-vertico vertico
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evil-snipe autorevert filenotify gcmh hl-line winner smartparens-config
smartparens-text smartparens ws-butler emojify evil-collection-apropos
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evil-collection-custom cus-edit cus-start cus-load wid-edit
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evil-terminal-cursor-changer color term/xterm xterm persp-mode
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doom-modeline-core all-the-icons all-the-icons-faces data-material
data-weathericons data-octicons data-fileicons data-faicons
data-alltheicons shrink-path f f-shortdoc shortdoc text-property-search
s dash compat dtrt-indent doom-themes-ext-treemacs doom-themes-ext-org
solaire-mode face-remap doom-one-theme doom-themes doom-themes-base
text-align julia-local fill-line comment-align setup-vterm
setup-treemacs setup-spell setup-prog-mode setup-org-mode setup-menu-bar
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threads xwidget-internal kqueue cocoa ns lcms2 multi-tty
make-network-process native-compile emacs)

Memory information:
((conses 16 438407 415086)
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 (strings 32 132168 31357)
 (string-bytes 1 3229232)
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 (intervals 56 843 120)
 (buffers 984 13))

Message #8 received at 60223 <at> debbugs.gnu.org (full text, mbox):

From: Yuan Fu <casouri <at> gmail.com>
To: ronisbr <at> ronanarraes.com
Cc: 60223 <at> debbugs.gnu.org
Subject: Re: bug#60223: 29.0.60; Improve how tree-sitter changes to 
 treesit--font-lock-fast-mode
Date: Tue, 20 Dec 2022 20:17:26 -0800

ronisbr <ronisbr <at> ronanarraes.com> writes:

> Hi!
>
> First of all, this is my very first interaction with Emacs mailing
> list. I have
> a problem in the tree-sitter module that leads to a bug (Emacs 29).
> Hence, I am
> not even sure if this is the right place to report it.
>
> treesit.el has a fast font-lock mode that is also used to avoid
> locking if some
> a query is taking too long:
>
>             ;; If for any query the query time is strangely long,
>             ;; switch to fast mode (see comments above).
>             (when (> (time-to-seconds (time-subtract end-time
>             start-time))
>                      0.01)
>               (setq-local treesit--font-lock-fast-mode t))
>
> When coding Julia major mode using tree-sitter
> (https://github.com/ronisbr/julia-ts-mode/blob/main/julia-ts-mode.el),
> I found a
> strange behavior in my setup (Doom Emacs) that is caused precisely by
> that
> feature.
>
> If I open this file together with Emacs (first initialization):
>
> https://github.com/ronisbr/PrettyTables.jl/blob/master/src/print.jl
>
> The file has almost no font decoration and
> `treesit--font-lock-fast-mode` is set
> to t. If I manually set it to nil and recompute everything, the font
> locking
> works perfectly again.
>
> However, everything works as expected if I open any other Julia code
> before
> opening that file (print.jl). In this case,
> `treesit--font-lock-fast-mode`
> remains nil.
>
> My guess is that due to something that might or might not be related
> to my
> setup, the query is taking longer than the 0.01s if I open that file
> during the
> initialization of Julia mode. It is caused by that enormous string
> used to
> document the function that seems to slow down tree-sitter parsing.
> Thus, I think
> it would be very important to have a variable to customize this time
> interval
> depending on the situation.
>
> Best regards,
> Ronan Arraes
>

Thanks for the report!

The "fast mode" should be buffer-local, so that particular file
shouldn’t affect other buffers. Just to make sure, you said that if you
open print.jl first, all other files are affected?

And I agree that the 0.01 second criterion is a crude one, but a long
string shouldn’t affect the _query_ time, and that string is not long at
all, far from enough to make tree-sitter query to slow down. Let me
investigate and see what’s the real cause, and if this can be solved by
better solutions than making the threshold customizable. We can’t expect
everyone to be able to pinpoint the culprit like you did :-)

Yuan

Message #11 received at 60223 <at> debbugs.gnu.org (full text, mbox):

From: ronisbr <ronisbr <at> ronanarraes.com>
To: Yuan Fu <casouri <at> gmail.com>
Cc: 60223 <at> debbugs.gnu.org
Subject: Re: bug#60223: 29.0.60; Improve how tree-sitter changes to
 treesit--font-lock-fast-mode
Date: Wed, 21 Dec 2022 12:59:27 -0300

Hi Yuan!

Em 2022-12-21 01:17, Yuan Fu escreveu:
> Thanks for the report!
> 
> The "fast mode" should be buffer-local, so that particular file
> shouldn’t affect other buffers. Just to make sure, you said that if you
> open print.jl first, all other files are affected?

Sorry for the misunderstanding. Indeed, only print.jl is affected.

The behavior is:

    1. If I open `print.jl` as the first file, the fast mode is 
activated,
       and the buffer shows a very strange font lock. All other buffers
       (including Julia files) work as expected.
    2. If I open any other Julia file and then I open `print.jl`, the 
fast
       mode is not activated, and everything works as expected.

> And I agree that the 0.01 second criterion is a crude one, but a long
> string shouldn’t affect the _query_ time, and that string is not long 
> at
> all, far from enough to make tree-sitter query to slow down. Let me
> investigate and see what’s the real cause, and if this can be solved by
> better solutions than making the threshold customizable. We can’t 
> expect
> everyone to be able to pinpoint the culprit like you did :-)
> 
> Yuan

Thanks! Let me know if I can help debugging :)

Best regards,
Ronan Arraes

Message #14 received at 60223 <at> debbugs.gnu.org (full text, mbox):

From: Yuan Fu <casouri <at> gmail.com>
To: ronisbr <at> ronanarraes.com
Cc: 60223 <at> debbugs.gnu.org
Subject: Re: bug#60223: 29.0.60; Improve how tree-sitter changes to 
 treesit--font-lock-fast-mode
Date: Sat, 24 Dec 2022 01:33:01 -0800

ronisbr <ronisbr <at> ronanarraes.com> writes:

> Hi Yuan!
>
> Em 2022-12-21 01:17, Yuan Fu escreveu:
>> Thanks for the report!
>> The "fast mode" should be buffer-local, so that particular file
>> shouldn’t affect other buffers. Just to make sure, you said that if you
>> open print.jl first, all other files are affected?
>
> Sorry for the misunderstanding. Indeed, only print.jl is affected.
>
> The behavior is:
>
>     1. If I open `print.jl` as the first file, the fast mode is
>     activated,
>        and the buffer shows a very strange font lock. All other buffers
>        (including Julia files) work as expected.
>     2. If I open any other Julia file and then I open `print.jl`, the
>     fast
>        mode is not activated, and everything works as expected.

Cool, that makes much more sence.

>> And I agree that the 0.01 second criterion is a crude one, but a long
>> string shouldn’t affect the _query_ time, and that string is not
>> long at
>> all, far from enough to make tree-sitter query to slow down. Let me
>> investigate and see what’s the real cause, and if this can be solved by
>> better solutions than making the threshold customizable. We can’t
>> expect
>> everyone to be able to pinpoint the culprit like you did :-)
>> Yuan
>
> Thanks! Let me know if I can help debugging :)

Which julia parser are you using? I installed the "official" one at
here: https://github.com/tree-sitter/tree-sitter-julia

but some queries in julia-ts-mode.el are not accepted by it, like the
(true) pattern: the parser I downloaded wants "true" instead.

Also julia-ts-mode has this code

(set-electric! 'julia-ts-mode
    :words '("catch"
             "else"
             "elseif"
             "finally"
             "end"))

which seems like a doom macro or something, since I don’t have doom
Emacs complains about undefined function. I commented it out so no
biggy, just FYI.

Yuan

Message #17 received at 60223 <at> debbugs.gnu.org (full text, mbox):

From: ronisbr <ronisbr <at> ronanarraes.com>
To: Yuan Fu <casouri <at> gmail.com>
Cc: 60223 <at> debbugs.gnu.org
Subject: Re: bug#60223: 29.0.60; Improve how tree-sitter changes to 
 treesit--font-lock-fast-mode
Date: Tue, 27 Dec 2022 00:16:25 -0300

Hi Yuan!

Em 2022-12-24 06:33, Yuan Fu escreveu:
> Which julia parser are you using? I installed the "official" one at
> here: https://github.com/tree-sitter/tree-sitter-julia
> 
> but some queries in julia-ts-mode.el are not accepted by it, like the
> (true) pattern: the parser I downloaded wants "true" instead.

Yes! I am using that parser. However, this modification happened in a
commit 4 days ago, and I have not updated `julia-ts-mode` yet.

> Also julia-ts-mode has this code
> 
> (set-electric! 'julia-ts-mode
>     :words '("catch"
>              "else"
>              "elseif"
>              "finally"
>              "end"))
> 
> which seems like a doom macro or something, since I don’t have doom
> Emacs complains about undefined function. I commented it out so no
> biggy, just FYI.

Oops, sorry about that! Yes, I am using Doom Emacs and this is
probably a macro for it.

Best regards,
Ronan Arraes

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