From: Stephane Chazelas <stephane@chazelas.org>
To: Peter Stephenson <p.w.stephenson@ntlworld.com>
Cc: zsh workers <zsh-workers@zsh.org>
Subject: Re: $var not expanded in ${x?$var}
Date: Tue, 20 Feb 2024 07:05:05 +0000 [thread overview]
Message-ID: <20240220070505.fd6jfbcdldieqv7u@chazelas.org> (raw)
In-Reply-To: <836025199.2014747.1673889335246@mail.virginmedia.com>
2023-01-16 17:15:35 +0000, Peter Stephenson:
> > On 13/01/2023 08:02 Stephane Chazelas <stephane@chazelas.org> wrote:
> >
> > $ zsh -c 'echo ${1?$USERNAME}'
> > zsh:1: 1: $USERNAME
> >
> > No quote removal either:
> >
> > $ zsh -c 'echo ${1?"x"}'
> > zsh:1: 1: "x"
> >
> > Doc says:
> >
> > > In any of the above expressions that test a variable and substitute an
> > > alternate WORD, note that you can use standard shell quoting in the WORD
> > > value to selectively override the splitting done by the SH_WORD_SPLIT
> > > option and the = flag, but not splitting by the s:STRING: flag.
>
> In fact the shell does not "substitute an alternate WORD" here, it
> just prints it out, but the difference is easy to miss and expanding it
> seems the right thing to do from other points of view, so I've noted it
> in the doc.
[...]
Thanks.
$ echo ${1?$'a\nb'}
zsh: 1: a\nb
$ print -Prv err '%F{red}BAD%f'
$ a=${1?$err}
zsh: 1: ^[[31mBAD^[[39m
That transformation of newline into \n and other nicezputs'ness
seems undesirable to me though.
It doesn't seem unreasonable for someone to want to provide a
multiline error message or one with terminal escape sequences.
See for instance
https://unix.stackexchange.com/questions/769679/bash-parameter-substitution-with-multi-line-error-message
AFAICT, except for bash doing the IFS-split + join, all other
shells send the expansion verbatim to stderr.
--
Stephane
next prev parent reply other threads:[~2024-02-20 7:05 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-13 8:02 Stephane Chazelas
2023-01-16 8:35 ` Daniel Shahaf
2023-01-16 17:15 ` Peter Stephenson
2024-02-20 7:05 ` Stephane Chazelas [this message]
2024-02-20 17:45 ` Bart Schaefer
2024-02-20 19:39 ` Stephane Chazelas
2024-02-21 4:44 ` Bart Schaefer
2024-02-21 19:45 ` Stephane Chazelas
2024-02-21 19:52 ` Bart Schaefer
2024-02-21 20:21 ` Stephane Chazelas
2024-02-22 0:46 ` [PATCH] unmetafy " Bart Schaefer
2024-02-22 7:23 ` Stephane Chazelas
2024-02-22 7:55 ` Metafication in error messages (Was: [PATCH] unmetafy Re: $var not expanded in ${x?$var}) Stephane Chazelas
2024-02-22 17:02 ` Bart Schaefer
2024-02-22 22:31 ` Bart Schaefer
2024-02-23 0:49 ` Bart Schaefer
2024-02-23 19:27 ` Stephane Chazelas
2024-02-23 22:32 ` Bart Schaefer
2024-02-23 23:38 ` Bart Schaefer
2024-02-24 9:47 ` Stephane Chazelas
2024-02-24 10:36 ` Stephane Chazelas
2024-02-25 4:35 ` [PATCH] 'bad interpreter' error garbled Bart Schaefer
2024-02-25 5:26 ` Bart Schaefer
2024-02-25 2:17 ` Metafication in error messages (Was: [PATCH] unmetafy Re: $var not expanded in ${x?$var}) Bart Schaefer
2024-02-25 6:05 ` Bart Schaefer
2024-02-25 7:29 ` Stephane Chazelas
2024-02-25 8:28 ` typeset -<non-ASCII> (Was: metafication in error messages) Stephane Chazelas
2024-02-25 8:35 ` Stephane Chazelas
2024-02-25 21:02 ` Bart Schaefer
2024-02-23 0:33 ` Metafication in error messages (Was: [PATCH] unmetafy Re: $var not expanded in ${x?$var}) Bart Schaefer
2024-02-25 5:06 ` [PATCH] count multibyte and metafied characters correctly for math ops errors Bart Schaefer
2024-02-22 8:34 ` [PATCH] unmetafy Re: $var not expanded in ${x?$var} Roman Perepelitsa
2024-02-22 17:07 ` Bart Schaefer
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