Lars Ingebrigtsen <larsi@HIDDEN>
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From: =?utf-8?B?Sm/Do28gVMOhdm9yYQ==?= <joaotavora@HIDDEN>
To: Augusto Stoffel <arstoffel@HIDDEN>
Subject: Re: bug#40865: 26.3; Electric pair mode and syntax class $
References: <993210aab0f5abcac7e2e84e4289468431c5b5f5.camel@HIDDEN>
Date: Tue, 12 May 2020 22:58:36 +0100
In-Reply-To: <993210aab0f5abcac7e2e84e4289468431c5b5f5.camel@HIDDEN>
(Augusto Stoffel's message of "Sun, 26 Apr 2020 12:18:32 +0200")
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Augusto Stoffel <arstoffel@HIDDEN> writes:
Hi Augusto, thank you for the report.
> Electric pair mode does not treat string quote characters and paired
> delimiters (syntax class "$") in the same way, but it should probably
> do so.
Paired delimiters don't formally define any kind of syntactic region
between them, contrary to string delimiters.
Therefore, electric-pair-mode can't easily know if a decision to skip or
auto-pair would be benefitting the balance of the syntax buffer.
Therefore, it decides to be dumb and always autopair, never autoskip.
If I had chosen the alternative, having your point just before a '$foo$'
would make autoskip put it inside the group, instead of creating a new
'$$$foo$', which is probably what you wanted in that particular
situation.
Maybe, even though flawed, that is more defensible as a default
behaviour than the current one. At least it doesn't seem to break any
tests.
The "correct" way to fix this is to make latex-mode treat paired
delimiters like it does string delimiteres. But that probably has other
negative implications that I'm not aware of.
I have the vague recollection that this came up when I was developing
electric-pair-mode, particularly in latex-mode, some 6 years ago, but I
can't remember anymore.
Anyway, if you do prefer the alternative I gave earlier you can do this:
(add-hook 'latex-mode-hook
(lambda ()
(add-function :before-until
(local 'electric-pair-skip-self)
(lambda (char) (eq char ?$))
'((name . latex-skip-paired-delimiters)))))
Jo=C3=A3o
PS: On a related note, note that AUCTex mode (a different mode to edit
TeX files) has a special binding for the dollar sign, TeX-insert-dollar,
which doesn't follow _any_ of electric-pair-mode.
bug-gnu-emacs@HIDDEN:bug#40865; Package emacs.
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Subject: 26.3; Electric pair mode and syntax class $
From: Augusto Stoffel <arstoffel@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Date: Sun, 26 Apr 2020 12:18:32 +0200
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Electric pair mode does not treat string quote characters and paired
delimiters (syntax class "$") in the same way, but it should probably
do so.
For instance, in TeX mode with electric pair mode active, typing a
dollar sign in the situation
$a<point here>$
shold result in
$a$<point here>
but instead results in
$a$<point here>$$
The issue seems to be related with the function
`electric-pair-skip-if-helps-balance'.
In GNU Emacs 26.3 (build 1, x86_64-redhat-linux-gnu, GTK+ Version
3.24.13)
of 2019-12-10 built on buildhw-07.phx2.fedoraproject.org
Windowing system distributor 'Fedora Project', version 11.0.12006000
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Augusto Stoffel <arstoffel@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#40865; Package emacs.
Full text available.
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