GNU bug report logs - #23102
Wrong usage of underscore in .tex files

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Package: emacs; Severity: minor; Reported by: Angelo Graziosi <angelo.graziosi@HIDDEN>; dated Wed, 23 Mar 2016 23:32:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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Subject: Re: bug#23102: Wrong usage of underscore in .tex files
To: Tassilo Horn <tsdh@HIDDEN>
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From: Angelo Graziosi <angelo.graziosi@HIDDEN>
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(resend because failed)

Ciao Tassilo, thanks for clarification..

Il 28/03/2016 11:46, Tassilo Horn ha scritto:
>
> GNU AUCTeX does the same: _ has only subscript semantics in math mode.

Emacs should conform to what AUCTeX does.. I think.

  Angelo




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Subject: Re: bug#23102: Wrong usage of underscore in .tex files
To: John Wiegley <jwiegley@HIDDEN>
References: <56F32728.1000105@HIDDEN> <m2bn60oir3.fsf@HIDDEN>
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From: Angelo Graziosi <angelo.graziosi@HIDDEN>
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Date: Tue, 29 Mar 2016 10:42:04 +0200
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Il 29/03/2016 08:52, John Wiegley ha scritto:
>>>>>> Angelo Graziosi <angelo.graziosi@HIDDEN> writes:
>
>> I found no example suggesting to use \_ in \href{}{} or \url{} commands.
>
> I guess those commands are special, which means latex-mode aught to treat them
> as special as well, so I'll leave this open.
>

Maybe there are other commands with this issue. For example:

\ProvidesFile{bla_bla.tex}[2016/03/23 v.0.0 BLA_BLA]

Now, see as Emacs displays it in the attachment..


  Angelo

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>>>>> Angelo Graziosi <angelo.graziosi@HIDDEN> writes:

> I found no example suggesting to use \_ in \href{}{} or \url{} commands.

I guess those commands are special, which means latex-mode aught to treat them
as special as well, so I'll leave this open.

-- 
John Wiegley                  GPG fingerprint = 4710 CF98 AF9B 327B B80F
http://newartisans.com                          60E1 46C4 BD1A 7AC1 4BA2




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From: Tassilo Horn <tsdh@HIDDEN>
To: Angelo Graziosi <angelo.graziosi@HIDDEN>
Subject: Re: bug#23102: Wrong usage of underscore in .tex files
References: <56F32728.1000105@HIDDEN> <m2bn60oir3.fsf@HIDDEN>
 <56F83A3D.5050404@HIDDEN>
Date: Mon, 28 Mar 2016 11:46:18 +0200
In-Reply-To: <56F83A3D.5050404@HIDDEN> (Angelo Graziosi's message of "Sun,
 27 Mar 2016 21:53:33 +0200")
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--=-=-=
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Angelo Graziosi <angelo.graziosi@HIDDEN> writes:

Hi Angelo and John,

>>> Attached is how Emacs displays the usage of underscore out of
>>> mathematics and friends, for example:
>>
>>> \href{http://www.foo.it/bla_bla.html}{BLA_BLA}
>>
>> I'm pretty sure that the underscore in BLA_BLA here is incorrect LaTeX.
>> Shouldn't it be BLA\_BLA, which does display correct in latex-mode?

Well, the plain underscore in BLA_BLA is indeed wrong but the plain
underscore in the URL *is* correct though escaping it with \ is also
permitted.

> Yes, it works but it is only a workaround in my opinion: treating an
> url string as in mathematics seems wrong to me.
>
> I found no example suggesting to use \_ in \href{}{} or \url{} commands.

Right, you don't need to use \_ in \url{} or \href's 1st argument.
Interestingly, stock `latex-mode' displays the argument of \url{} as
verbatim without subscripting the character after the _.  It should do
the same with the first argument of \href.

> I tried with Atom Editor and its language-latex package, and the above example
> (BLA_BLA...) is displayed as expected from me. See attachment.

GNU AUCTeX does the same: _ has only subscript semantics in math mode.

--=-=-=
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--=-=-=
Content-Type: text/plain


Bye,
Tassilo

--=-=-=--




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#23102; Package emacs. Full text available.

Message received at 23102 <at> debbugs.gnu.org:


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Subject: Re: bug#23102: Wrong usage of underscore in .tex files
To: John Wiegley <jwiegley@HIDDEN>
References: <56F32728.1000105@HIDDEN> <m2bn60oir3.fsf@HIDDEN>
From: Angelo Graziosi <angelo.graziosi@HIDDEN>
Message-ID: <56F83A3D.5050404@HIDDEN>
Date: Sun, 27 Mar 2016 21:53:33 +0200
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Il 27/03/2016 01:40, John Wiegley ha scritto:
>>>>>> Angelo Graziosi <angelo.graziosi@HIDDEN> writes:
>
>> Attached is how Emacs displays the usage of underscore out of mathematics
>> and friends, for example:
>
>> \href{http://www.foo.it/bla_bla.html}{BLA_BLA}
>
> I'm pretty sure that the underscore in BLA_BLA here is incorrect LaTeX.
> Shouldn't it be BLA\_BLA, which does display correct in latex-mode?
>

Yes, it works but it is only a workaround in my opinion: treating an url 
string as in mathematics seems wrong to me.

I found no example suggesting to use \_ in \href{}{} or \url{} commands.

I tried with Atom Editor and its language-latex package, and the above 
example (BLA_BLA...) is displayed as expected from me. See attachment.

Anyway, if you think it is OK to use \_, you can close this bug report.

  Angelo

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--------------020507000804020807060606--




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#23102; Package emacs. Full text available.

Message received at 23102 <at> debbugs.gnu.org:


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From: John Wiegley <jwiegley@HIDDEN>
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To: Angelo Graziosi <angelo.graziosi@HIDDEN>
Subject: Re: bug#23102: Wrong usage of underscore in .tex files
In-Reply-To: <56F32728.1000105@HIDDEN> (Angelo Graziosi's message of "Thu,
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Date: Sat, 26 Mar 2016 17:40:48 -0700
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>>>>> Angelo Graziosi <angelo.graziosi@HIDDEN> writes:

> Attached is how Emacs displays the usage of underscore out of mathematics
> and friends, for example:

> \href{http://www.foo.it/bla_bla.html}{BLA_BLA}

I'm pretty sure that the underscore in BLA_BLA here is incorrect LaTeX.
Shouldn't it be BLA\_BLA, which does display correct in latex-mode?

-- 
John Wiegley                  GPG fingerprint = 4710 CF98 AF9B 327B B80F
http://newartisans.com                          60E1 46C4 BD1A 7AC1 4BA2




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#23102; Package emacs. Full text available.

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


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From: Angelo Graziosi <angelo.graziosi@HIDDEN>
Subject: Wrong usage of underscore in .tex files
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Date: Thu, 24 Mar 2016 00:30:48 +0100
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This is a multi-part message in MIME format.
--------------050606080609090705010606
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Attached is how Emacs displays the usage of underscore out of 
mathematics and friends, for example:

\href{http://www.foo.it/bla_bla.html}{BLA_BLA}

here the underscore is not used to display a subscript as in $A_n$ so 
the result, in my opinion, is wrong. At first sight, it is also almost 
unreadable...

  Angelo

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--------------050606080609090705010606--




Acknowledgement sent to Angelo Graziosi <angelo.graziosi@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#23102; Package emacs. Full text available.
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Last modified: Mon, 25 Nov 2019 12:00:02 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.