GNU bug report logs - #70236
Truncating only happening on 900 character long lines in *compilation* buffer

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Package: emacs; Reported by: Dan Jacobson <jidanni@HIDDEN>; Done: Eli Zaretskii <eliz@HIDDEN>; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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Date: Sun, 14 Apr 2024 01:09:58 +1200
From: Phil Sainty <psainty@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#70236: Truncating only happening on 900 character long
 lines in *compilation* buffer
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On 2024-04-14 00:04, Eli Zaretskii wrote:
> Feel free to fix as you see fit, and thanks in advance.

I've pushed commit f950621e6a177fc3110f3dec7c92b7d499fd25d6 to
resolve that.  It's working correctly for the reported test case
so far as I can see.


-Phil
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#70236; Package emacs. Full text available.

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From: Eli Zaretskii <eliz@HIDDEN>
To: Phil Sainty <psainty@HIDDEN>
In-Reply-To: <4037e3d2bad9584f9c350345cff302f6@HIDDEN> (message
 from Phil Sainty on Sat, 13 Apr 2024 23:06:32 +1200)
Subject: Re: bug#70236: Truncating only happening on 900 character long
 lines in *compilation* buffer
References: <87msq64zvd.5.fsf@HIDDEN>
 <defcd4bca1633536b5e2a386547bb383@HIDDEN>
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> Date: Sat, 13 Apr 2024 23:06:32 +1200
> From: Phil Sainty <psainty@HIDDEN>
> Cc: Dan Jacobson <jidanni@HIDDEN>, 70236-done <at> debbugs.gnu.org
> 
> On 2024-04-13 21:06, Eli Zaretskii wrote:
> > No further comments, so I presume the bug is indeed fixed,
> > and I'm therefore closing it.
> 
> Thanks Eli.  I presumed Dan would have tested, but I've just
> given that a whirl and it looks like there's an off-by-one
> bug in the fix.

Feel free to fix as you see fit, and thanks in advance.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#70236; Package emacs. Full text available.

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Date: Sat, 13 Apr 2024 23:06:32 +1200
From: Phil Sainty <psainty@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#70236: Truncating only happening on 900 character long
 lines in *compilation* buffer
In-Reply-To: <864jc5r5qx.fsf@HIDDEN>
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On 2024-04-13 21:06, Eli Zaretskii wrote:
> No further comments, so I presume the bug is indeed fixed,
> and I'm therefore closing it.

Thanks Eli.  I presumed Dan would have tested, but I've just
given that a whirl and it looks like there's an off-by-one
bug in the fix.

Apart from the "900" line (which seems to remain special for
whatever reason the truncation was working there in the first
place), all the lines > 400 chars are getting two buttons:
one with the ellipsis, followed by a second button which is
"hiding" only the final character in the line (but also using
that character as the button text, so it's not "hidden", and
selecting that button just has the effect of that character
no longer looking like a button.

So in that test file the end of the lines looks like "[…]]"
but the two "]" chars are not related -- it's just that "]"
is the last character of each long line in that test file.

Selecting the […] button eliminates both buttons, but
selecting the "final character" button only eliminates that
button (as in both cases the button callback acts through to
the `line-end-position'.

I *think* commenting out this addition is the solution?
You'd already called `backward-char' earlier, so it looks
like this was doubling-up on that.

           (put-text-property
            start ;; (if ends-in-nl
                  ;;     ;; Don't hide the final newline.
                  ;;     (1- (point))
                    (point);; )
            'display (if (char-displayable-p ?…) "[…]" "[...]"))


-Phil
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#70236; Package emacs. Full text available.

Message received at 70236-done <at> debbugs.gnu.org:


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Date: Sat, 13 Apr 2024 12:06:46 +0300
Message-Id: <864jc5r5qx.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Dan Jacobson <jidanni@HIDDEN>
In-Reply-To: <865xwt1qtd.fsf@HIDDEN> (message from Eli Zaretskii on Sun, 07
 Apr 2024 12:10:22 +0300)
Subject: Re: bug#70236: Truncating only happening on 900 character long lines
 in *compilation* buffer
References: <87msq64zvd.5.fsf@HIDDEN>
 <defcd4bca1633536b5e2a386547bb383@HIDDEN>
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> Cc: 70236 <at> debbugs.gnu.org
> Date: Sun, 07 Apr 2024 12:10:22 +0300
> From: Eli Zaretskii <eliz@HIDDEN>
> 
> > Date: Sun, 07 Apr 2024 13:31:28 +1200
> > From: Phil Sainty <psainty@HIDDEN>
> > 
> > This will generate the same output as that perl:
> > 
> > (cl-loop for n from 100 to 1500 by 100 do
> >           (insert (number-to-string n)
> >                   " [\"" (make-string n (string-to-char
> >                                            (format "%X" (/ n 100))))
> >                   "\"]\n\n"))
> > 
> > If you write that to a file "test" in some temp dir and have
> > a Makefile like this:
> > 
> > foo:
> > 	cat test
> > 
> > Then the suggested command will demonstrate the issue:
> > 
> > emacs -Q -f compile
> > 
> > What you're looking at is the difference between the "900" line
> > (which gets truncated) and all the other lines (which do not).
> > 
> > compilation-max-output-line-length is 400
> 
> Thanks, should be fixed now on the master branch.

No further comments, so I presume the bug is indeed fixed, and I'm
therefore closing it.
Notification sent to Dan Jacobson <jidanni@HIDDEN>:
bug acknowledged by developer. Full text available.
Reply sent to Eli Zaretskii <eliz@HIDDEN>:
You have taken responsibility. Full text available.

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Date: Sun, 07 Apr 2024 12:10:22 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
To: Phil Sainty <psainty@HIDDEN>
In-Reply-To: <defcd4bca1633536b5e2a386547bb383@HIDDEN> (message
 from Phil Sainty on Sun, 07 Apr 2024 13:31:28 +1200)
Subject: Re: bug#70236: Truncating only happening on 900 character long lines
 in *compilation* buffer
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 <defcd4bca1633536b5e2a386547bb383@HIDDEN>
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> Date: Sun, 07 Apr 2024 13:31:28 +1200
> From: Phil Sainty <psainty@HIDDEN>
> 
> This will generate the same output as that perl:
> 
> (cl-loop for n from 100 to 1500 by 100 do
>           (insert (number-to-string n)
>                   " [\"" (make-string n (string-to-char
>                                            (format "%X" (/ n 100))))
>                   "\"]\n\n"))
> 
> If you write that to a file "test" in some temp dir and have
> a Makefile like this:
> 
> foo:
> 	cat test
> 
> Then the suggested command will demonstrate the issue:
> 
> emacs -Q -f compile
> 
> What you're looking at is the difference between the "900" line
> (which gets truncated) and all the other lines (which do not).
> 
> compilation-max-output-line-length is 400

Thanks, should be fixed now on the master branch.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#70236; Package emacs. Full text available.

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Date: Sun, 7 Apr 2024 14:28:37 +0800
From: Dan Jacobson <jidanni@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#70236: Truncating only happening on 900 character long lines
 in *compilation* buffer
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OK, sorry. I cleaned it up. Please give it another (two) runs. Thanks!

On Sat, Apr 06, 2024 at 02:01:15PM +0300, Eli Zaretskii wrote:
> > https://emacs.stackexchange.com/questions/80941/what-truncates-lines-at-the-400th-character-in-the-compilation-buffer/80949

> I also don't understand what exactly is a bug here.  Is it the fact
> that truncation happens at the 900th character, or is it about the
> need of a nosy user to understand how the extra characters are hidden?

You'll see that it doesn't happen on the shorter lines, or longer lines, but only on that line!
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#70236; Package emacs. Full text available.

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From: Phil Sainty <psainty@HIDDEN>
To: 70236 <at> debbugs.gnu.org
Subject: Re: bug#70236: Truncating only happening on 900 character long
 lines in *compilation* buffer
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This will generate the same output as that perl:

(cl-loop for n from 100 to 1500 by 100 do
          (insert (number-to-string n)
                  " [\"" (make-string n (string-to-char
                                           (format "%X" (/ n 100))))
                  "\"]\n\n"))

If you write that to a file "test" in some temp dir and have
a Makefile like this:

foo:
	cat test

Then the suggested command will demonstrate the issue:

emacs -Q -f compile

What you're looking at is the difference between the "900" line
(which gets truncated) and all the other lines (which do not).

compilation-max-output-line-length is 400
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#70236; Package emacs. Full text available.

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Date: Sat, 06 Apr 2024 14:01:15 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
To: Dan Jacobson <jidanni@HIDDEN>
In-Reply-To: <87msq64zvd.5.fsf@HIDDEN> (message from Dan Jacobson on Sat, 
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Subject: Re: bug#70236: Truncating only happening on 900 character long lines
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> From: Dan Jacobson <jidanni@HIDDEN>
> Date: Sat, 06 Apr 2024 17:14:14 +0800
> 
> In
> https://emacs.stackexchange.com/questions/80941/what-truncates-lines-at-the-400th-character-in-the-compilation-buffer/80949
> I have reproduced truncating triggered on 900 character lines only,
> when one would expect it happening on other lines too.

When I try to reproduce, I get an error:

  make -k
  perl -MJSON -we 'for(1..9, q(A)..q(F)){$n=$_ x (hex ($_) * 100); @k=($n); print\
   length $n, " ", encode_json \@k, $/ x 2;}'
  Can't locate JSON.pm in @INC (you may need to install the JSON module) (@INC co\
  ntains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.34.0 /usr/local/share/\
  perl/5.34.0 /usr/lib/x86_64-linux-gnu/perl5/5.34 /usr/share/perl5 /usr/lib/x86_\
  64-linux-gnu/perl-base /usr/lib/x86_64-linux-gnu/perl/5.34 /usr/share/perl/5.34\
   /usr/local/lib/site_perl).
  BEGIN failed--compilation aborted.
  make: *** [Makefile:2: k] Error 2

So please post a recipe which mere mortals can follow without the need
to go down the rabbit hole if installing Perl modules and whatnot.
Surely, investigating an Emacs issue shouldn't require any Perl modules.

I also don't understand what exactly is a bug here.  Is it the fact
that truncation happens at the 900th character, or is it about the
need of a nosy user to understand how the extra characters are hidden?
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#70236; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: Dan Jacobson <jidanni@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: Truncating only happening on 900 character long lines in
 *compilation* buffer
Date: Sat, 06 Apr 2024 17:14:14 +0800
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In
https://emacs.stackexchange.com/questions/80941/what-truncates-lines-at-the-400th-character-in-the-compilation-buffer/80949
I have reproduced truncating triggered on 900 character lines only,
when one would expect it happening on other lines too.
Acknowledgement sent to Dan Jacobson <jidanni@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#70236; Package emacs. Full text available.
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