GNU bug report logs - #42588
27.0.50; Emacs shell differs from a terminal in unexpected ways

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Markus Triska <triska <at> metalevel.at>
Subject: bug#42588: closed (This issue is resolved by a change in Scryer
 Prolog)
Date: Sat, 01 Aug 2020 08:01:02 +0000

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Your bug report

#42588: 27.0.50; Emacs shell differs from a terminal in unexpected ways

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 42588 <at> debbugs.gnu.org.

-- 
42588: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=42588
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Markus Triska <triska <at> metalevel.at>
To: 42588-done <at> debbugs.gnu.org
Subject: This issue is resolved by a change in Scryer Prolog
Date: Sat, 01 Aug 2020 09:59:59 +0200

A change was installed in Scryer Prolog that resolves this:

  https://github.com/mthom/scryer-prolog/issues/643

The system now works as expected in the Emacs shell.

Thank you a lot!
Markus

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From: Markus Triska <triska <at> metalevel.at>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.0.50; Emacs shell differs from a terminal in unexpected ways
Date: Tue, 28 Jul 2020 22:44:09 +0200

To reproduce this issue, please install Scryer Prolog in one of the ways
indicated in its source repository:

    https://github.com/mthom/scryer-prolog/

For example, use:

    $ cargo install scryer-prolog

Then, start Emacs with:

    $ emacs -Q

and start a shell with M-x shell RET. In the shell, invoke Scryer Prolog
and paste the following in the buffer:

    writeq('\
    '). % "\\\n" 

Scryer Prolog will answer with:

    caught: error(syntax_error(invalid_single_quoted_character),read_term/3)
    ?- caught: error(syntax_error(invalid_single_quoted_character),read_term/3)
    ?-

However, when I launch Scryer Prolog in any terminal application and
paste the exact same text, I get as response:

    ''   true.

So, the entire interaction reads, and is supposed to be:

    ?- writeq('\
    '). % "\\\n" 
    ''   true.

I expect the same result when posting this in the Emacs shell. However,
in the Emacs shell, the entire interaction is unexpectedly:

    bash-3.2$ ~/scryer-prolog/target/release/scryer-prolog 
    ?- writeq('\
    '). % "\\\n" 
    caught: error(syntax_error(invalid_single_quoted_character),read_term/3)
    ?- caught: error(syntax_error(invalid_single_quoted_character),read_term/3)
    ?- 

Could you please have a look, and if possible implement the behaviour of
the system terminal also in the Emacs shell?

Thank you a lot!
Markus

In GNU Emacs 27.0.50 (build 1, x86_64-apple-darwin18.0.0, X toolkit, Xaw scroll bars)
 of 2018-11-15 built on mt-mac
Repository revision: b4eb908f858284a7962851fd99c94598f76afa6f
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:  Mac OS X 10.14.2

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