From: Martijn Dekker <martijn@inlv.org>
To: zsh-workers@zsh.org
Subject: Re: 'while do done' hangs interactive zsh
Date: Sun, 16 May 2021 20:25:21 +0200 [thread overview]
Message-ID: <d6f015b1-4735-a681-47c3-582b0362965e@inlv.org> (raw)
In-Reply-To: <CAH+w=7YQqiev2TrWLg-5jGh+Kac2KVe-xQ6JLpJFmaPHr8wsMw@mail.gmail.com>
Op 16-05-21 om 20:02 schreef Bart Schaefer:
> Bash requires at least one pipeline in the do-LIST as well.
>
> Is this worth making into an emulation-mode thing, i.e., adding a
> couple of more conditions to my while-do-done patch?
My understanding of the emulation mode is that it attempts to make the
changes necessary to eliminate incompatibilities with the POSIX
standard. This does not require disabling extensions that are compatible
with it.
The two empty command lists in 'while do done' are both straightforward
syntax errors in POSIX, so the extension to allow them is not
incompatible with the standard; there's no syntactic clash with the
POSIX equivalent, 'while :; do :; done'. So I see no need for the
emulation mode to disallow empty command lists.
AFAIK there's only one shell with a POSIX mode that attempts to disallow
(almost) everything not specified by the standard, and that's yash.
--
|| modernish -- harness the shell
|| https://github.com/modernish/modernish
||
|| KornShell lives!
|| https://github.com/ksh93/ksh
prev parent reply other threads:[~2021-05-16 18:26 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-16 9:16 Arseny Maslennikov
2021-05-16 14:28 ` Bart Schaefer
2021-05-16 15:46 ` Bart Schaefer
2021-05-16 16:15 ` Mikael Magnusson
2021-05-16 16:22 ` Lawrence Velázquez
2021-05-16 17:47 ` Bart Schaefer
2021-05-16 18:23 ` Martijn Dekker
2021-05-16 19:59 ` Bart Schaefer
2021-05-16 20:34 ` Peter Stephenson
2021-05-16 21:19 ` [PATCH] volatile declarations (was Re: 'while do done' hangs interactive zsh) Bart Schaefer
2021-05-16 23:40 ` Martijn Dekker
2021-05-16 16:43 ` 'while do done' hangs interactive zsh Stephane Chazelas
2021-05-16 18:02 ` Bart Schaefer
2021-05-16 18:25 ` Martijn Dekker [this message]
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