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From: Bart Schaefer <schaefer@brasslantern.com>
To: "zsh-workers@zsh.org" <zsh-workers@zsh.org>
Cc: "Tom M." <boojum@stercus-accidit.com>
Subject: Re: Ternary expression in Zsh (was: Feature request – substitutions similar to +, -, :+, :-)
Date: Tue, 5 Dec 2017 01:04:58 -0800	[thread overview]
Message-ID: <CAH+w=7YxnGzRa=0SL=Cj9c6FfGpStHaZQ29AREHHKKQaaUhKEQ@mail.gmail.com> (raw)
In-Reply-To: <CACfAdfYgAjNR7AWTLtF=zLMF5vOgOpzxJHQznf1K-O=YX797ww@mail.gmail.com>

On Tue, Dec 5, 2017 at 12:06 AM, Tom M. <boojum@stercus-accidit.com> wrote:
>> $ true; echo ${${=:-green red}[2-!?]}
>> green
>> $ false; echo ${${=:-green red}[2-!?]}
>> red
>
> The above fails for me:
> [...]
> And if run from zsh -f:
> % true; echo ${${=:-green red}[2-!?]}
> zsh: no such event: ]}

Stephane has forgotten that he has "setopt nobanghist".

You can get the same effect with $? except the sense is reversed:

% true; echo ${${=:-green red}[2-$?]}
red
% false; echo ${${=:-green red}[2-$?]}
green

This avoids the issue with banghist, but beware of commands that
return other than 0 or 1 for success/failure.


  reply	other threads:[~2017-12-05  9:05 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-18 18:05 Feature request – substitutions similar to +, -, :+, :- Sebastian Gniazdowski
2017-11-18 18:22 ` Sebastian Gniazdowski
2017-11-18 18:46   ` Bart Schaefer
     [not found]   ` <etPan.5a10805d.57d72d7c.137@AirmailxGenerated.am>
2017-11-25 11:15     ` Sebastian Gniazdowski
2017-12-03  9:11       ` Ternary expression in Zsh (was: Feature request – substitutions similar to +, -, :+, :-) Sebastian Gniazdowski
2017-12-05  6:55         ` Stephane Chazelas
2017-12-05  8:06           ` Tom M.
2017-12-05  9:04             ` Bart Schaefer [this message]
2017-12-05  8:24         ` Sebastian Gniazdowski
2017-12-05  9:05           ` Bart Schaefer

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