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The code `(forward-thing 'sentence)' is not working in narrowed region
under c-ts-mode.

For example, open file `test.c`, then turn on `c-ts-mode', what in the
buffer is:

    int main () { return 0; }
  
Now select word `return' and execute `narrow-to-region', then in buffer:

    Ireturn

where `I' represent the cursor. Now execute:

    (forward-thing 'sentence)

Then you will find that the cursor is stay still, not moving to the
end. This behavior is not like the ones anywhere else, I think it's a bug.




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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: lorniu <lorniu@HIDDEN>
Subject: bug#76679: Acknowledgement (31.0.50; forward-sentence not working
 in the narrowed buffer under c-ts-mode)
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Subject: bug#76679: 31.0.50; forward-sentence not working in the narrowed buffer under c-ts-mode
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> From: lorniu <lorniu@HIDDEN>
> Date: Sun, 02 Mar 2025 15:44:48 +0800
> 
> 
> The code `(forward-thing 'sentence)' is not working in narrowed region
> under c-ts-mode.
> 
> For example, open file `test.c`, then turn on `c-ts-mode', what in the
> buffer is:
> 
>     int main () { return 0; }
>   
> Now select word `return' and execute `narrow-to-region', then in buffer:
> 
>     Ireturn
> 
> where `I' represent the cursor. Now execute:
> 
>     (forward-thing 'sentence)
> 
> Then you will find that the cursor is stay still, not moving to the
> end. This behavior is not like the ones anywhere else, I think it's a bug.

I'm not sure the notion of a "sentence" is well defined in C-like
languages.

Yuan and Juri, any comments or suggestions?




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>> The code `(forward-thing 'sentence)' is not working in narrowed region
>> under c-ts-mode.
>> 
>> For example, open file `test.c`, then turn on `c-ts-mode', what in the
>> buffer is:
>> 
>>     int main () { return 0; }
>>   
>> Now select word `return' and execute `narrow-to-region', then in buffer:
>> 
>>     Ireturn
>> 
>> where `I' represent the cursor. Now execute:
>> 
>>     (forward-thing 'sentence)
>> 
>> Then you will find that the cursor is stay still, not moving to the
>> end. This behavior is not like the ones anywhere else, I think it's a bug.
>
> I'm not sure the notion of a "sentence" is well defined in C-like
> languages.
>
> Yuan and Juri, any comments or suggestions?

We agreed that a "sentence" in C-like languages is a thing that
ends with a semicolon (or a comma that separates arguments).

However, this report raises a different question: whether forward-sentence
should navigate to the end of the narrowed region when the semicolon is hidden?




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Juri Linkov <juri@HIDDEN> writes:

> We agreed that a "sentence" in C-like languages is a thing that
> ends with a semicolon (or a comma that separates arguments).
>
> However, this report raises a different question: whether forward-sentence
> should navigate to the end of the narrowed region when the semicolon is hidden?

Isn't that what forward-sentence does in e.g. text-mode?  So wouldn't
doing that in C-like languages be consistent with that?




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>> We agreed that a "sentence" in C-like languages is a thing that
>> ends with a semicolon (or a comma that separates arguments).
>>
>> However, this report raises a different question: whether forward-sentence
>> should navigate to the end of the narrowed region when the semicolon is hidden?
>
> Isn't that what forward-sentence does in e.g. text-mode?  So wouldn't
> doing that in C-like languages be consistent with that?

When you set the end of the narrowed region at the middle
of the sentence either in text-mode or in C-like languages,
then use forward-sentence to move the end of the narrowed region,
then widen with 'C-x n w', point will be not at the end
of the sentence.  This behavior makes no sense.

Regardless of the fact that treesit-forward-sentence works
differently from forward-sentence, their both results make no sense.

There is no meaningful difference whether to keep point at its old
position as treesit-forward-sentence does, or move point to the
middle of the sentence as forward-sentence does.

So I think there is no bug here.




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> From: Juri Linkov <juri@HIDDEN>
> Cc: lorniu <lorniu@HIDDEN>,  Yuan Fu <casouri@HIDDEN>,
>   76679 <at> debbugs.gnu.org
> Date: Mon, 10 Mar 2025 20:28:12 +0200
> 
> >> The code `(forward-thing 'sentence)' is not working in narrowed region
> >> under c-ts-mode.
> >> 
> >> For example, open file `test.c`, then turn on `c-ts-mode', what in the
> >> buffer is:
> >> 
> >>     int main () { return 0; }
> >>   
> >> Now select word `return' and execute `narrow-to-region', then in buffer:
> >> 
> >>     Ireturn
> >> 
> >> where `I' represent the cursor. Now execute:
> >> 
> >>     (forward-thing 'sentence)
> >> 
> >> Then you will find that the cursor is stay still, not moving to the
> >> end. This behavior is not like the ones anywhere else, I think it's a bug.
> >
> > I'm not sure the notion of a "sentence" is well defined in C-like
> > languages.
> >
> > Yuan and Juri, any comments or suggestions?
> 
> We agreed that a "sentence" in C-like languages is a thing that
> ends with a semicolon (or a comma that separates arguments).
> 
> However, this report raises a different question: whether forward-sentence
> should navigate to the end of the narrowed region when the semicolon is hidden?

Nothing else would make sense.  Almost all Emacs commands behave like
there's nothing beyond the end of the narrowed region.  The few
exceptions are only in very specialized cases, which this one isn't,
because it's just a movement command.




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> From: Juri Linkov <juri@HIDDEN>
> Cc: Eli Zaretskii <eliz@HIDDEN>,  76679 <at> debbugs.gnu.org,  lorniu
>  <lorniu@HIDDEN>,  Yuan Fu <casouri@HIDDEN>
> Date: Tue, 11 Mar 2025 09:24:05 +0200
> 
> >> We agreed that a "sentence" in C-like languages is a thing that
> >> ends with a semicolon (or a comma that separates arguments).
> >>
> >> However, this report raises a different question: whether forward-sentence
> >> should navigate to the end of the narrowed region when the semicolon is hidden?
> >
> > Isn't that what forward-sentence does in e.g. text-mode?  So wouldn't
> > doing that in C-like languages be consistent with that?
> 
> When you set the end of the narrowed region at the middle
> of the sentence either in text-mode or in C-like languages,
> then use forward-sentence to move the end of the narrowed region,
> then widen with 'C-x n w', point will be not at the end
> of the sentence.  This behavior makes no sense.

Why does it not make sense?  What else would you expect a movement
command to do?




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Juri Linkov <juri@HIDDEN> writes:

>>> We agreed that a "sentence" in C-like languages is a thing that
>>> ends with a semicolon (or a comma that separates arguments).
>>>
>>> However, this report raises a different question: whether forward-sentence
>>> should navigate to the end of the narrowed region when the semicolon is hidden?
>>
>> Isn't that what forward-sentence does in e.g. text-mode?  So wouldn't
>> doing that in C-like languages be consistent with that?
>
> When you set the end of the narrowed region at the middle
> of the sentence either in text-mode or in C-like languages,
> then use forward-sentence to move the end of the narrowed region,
> then widen with 'C-x n w', point will be not at the end
> of the sentence.  This behavior makes no sense.
>
> Regardless of the fact that treesit-forward-sentence works
> differently from forward-sentence, their both results make no sense.
>
> There is no meaningful difference whether to keep point at its old
> position as treesit-forward-sentence does, or move point to the
> middle of the sentence as forward-sentence does.
>
> So I think there is no bug here.

Doesn't it make sense to be consistent with `fundamental-mode`?

Consider this case:

    (progn
      (get-buffer-create "mybuf99")
      (pop-to-buffer "mybuf99")
      (erase-buffer)
      (insert "sentence sentence sentence.")
      (goto-char (point-min))
      (narrow-to-region (point-min) 15)
      (forward-sentence)
      (widen))




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>> However, this report raises a different question: whether forward-sentence
>> should navigate to the end of the narrowed region when the semicolon is hidden?
>
> Nothing else would make sense.  Almost all Emacs commands behave like
> there's nothing beyond the end of the narrowed region.  The few
> exceptions are only in very specialized cases, which this one isn't,
> because it's just a movement command.

Ok, this patch provides the same behavior as for forward-sentence:

diff --git a/lisp/treesit.el b/lisp/treesit.el
index 319dc5a41fc..f94c97c2e7c 100644
--- a/lisp/treesit.el
+++ b/lisp/treesit.el
@@ -3417,9 +3417,10 @@ treesit-forward-sentence
 by `text' and `sentence' in `treesit-thing-settings'."
   (if (treesit-node-match-p (treesit-node-at (point)) 'text t)
       (funcall #'forward-sentence-default-function arg)
-    (funcall
-     (if (> arg 0) #'treesit-end-of-thing #'treesit-beginning-of-thing)
-     'sentence (abs arg))))
+    (or (funcall
+         (if (> arg 0) #'treesit-end-of-thing #'treesit-beginning-of-thing)
+         'sentence (abs arg))
+        (goto-char (if (> arg 0) (point-max) (point-min))))))




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merge 76679 76497
close 76679 31.0.50
thanks

> @@ -3417,9 +3417,10 @@ treesit-forward-sentence
>  by `text' and `sentence' in `treesit-thing-settings'."
>    (if (treesit-node-match-p (treesit-node-at (point)) 'text t)
>        (funcall #'forward-sentence-default-function arg)
> -    (funcall
> -     (if (> arg 0) #'treesit-end-of-thing #'treesit-beginning-of-thing)
> -     'sentence (abs arg))))
> +    (or (funcall
> +         (if (> arg 0) #'treesit-end-of-thing #'treesit-beginning-of-thing)
> +         'sentence (abs arg))
> +        (goto-char (if (> arg 0) (point-max) (point-min))))))

Actually this is not so simple, because also need to handle
range boundaries as well.  So pushed the change that stops
at the 'treesit-parser' overlay's end.




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From: Juri Linkov <juri@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#76679: 31.0.50; forward-sentence not working in the
 narrowed buffer under c-ts-mode
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 <87y0xcrb9f.fsf@HIDDEN> <86msdrdbgg.fsf@HIDDEN>
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Date: Thu, 13 Mar 2025 20:45:09 +0200
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merge 76679 76497
close 76679 31.0.50
thanks

> @@ -3417,9 +3417,10 @@ treesit-forward-sentence
>  by `text' and `sentence' in `treesit-thing-settings'."
>    (if (treesit-node-match-p (treesit-node-at (point)) 'text t)
>        (funcall #'forward-sentence-default-function arg)
> -    (funcall
> -     (if (> arg 0) #'treesit-end-of-thing #'treesit-beginning-of-thing)
> -     'sentence (abs arg))))
> +    (or (funcall
> +         (if (> arg 0) #'treesit-end-of-thing #'treesit-beginning-of-thing)
> +         'sentence (abs arg))
> +        (goto-char (if (> arg 0) (point-max) (point-min))))))

Actually this is not so simple, because also need to handle
range boundaries as well.  So pushed the change that stops
at the 'treesit-parser' overlay's end.




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From: Juri Linkov <juri@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#76679: 31.0.50; forward-sentence not working in the
 narrowed buffer under c-ts-mode
In-Reply-To: <87ldtbo5s8.fsf@HIDDEN>
Organization: LINKOV.NET
References: <87mse37u6n.fsf@HIDDEN> <8634fmh6gm.fsf@HIDDEN>
 <87y0xcrb9f.fsf@HIDDEN> <86msdrdbgg.fsf@HIDDEN>
 <87ldtbo5s8.fsf@HIDDEN>
Date: Thu, 13 Mar 2025 20:45:09 +0200
Message-ID: <87cyekwz0q.fsf@HIDDEN>
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merge 76679 76497
close 76679 31.0.50
thanks

> @@ -3417,9 +3417,10 @@ treesit-forward-sentence
>  by `text' and `sentence' in `treesit-thing-settings'."
>    (if (treesit-node-match-p (treesit-node-at (point)) 'text t)
>        (funcall #'forward-sentence-default-function arg)
> -    (funcall
> -     (if (> arg 0) #'treesit-end-of-thing #'treesit-beginning-of-thing)
> -     'sentence (abs arg))))
> +    (or (funcall
> +         (if (> arg 0) #'treesit-end-of-thing #'treesit-beginning-of-thing)
> +         'sentence (abs arg))
> +        (goto-char (if (> arg 0) (point-max) (point-min))))))

Actually this is not so simple, because also need to handle
range boundaries as well.  So pushed the change that stops
at the 'treesit-parser' overlay's end.





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