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From: Bart Schaefer <schaefer@brasslantern.com>
Date: Tue, 5 Dec 2017 01:04:58 -0800
Message-ID: <CAH+w=7YxnGzRa=0SL=Cj9c6FfGpStHaZQ29AREHHKKQaaUhKEQ@mail.gmail.com>
Subject: =?UTF-8?Q?Re=3A_Ternary_expression_in_Zsh_=28was=3A_Feature_request_?=
	=?UTF-8?Q?=E2=80=93_substitutions_similar_to_=2B=2C_=2D=2C_=3A=2B=2C_=3A=2D=29?=
To: "zsh-workers@zsh.org" <zsh-workers@zsh.org>
Cc: "Tom M." <boojum@stercus-accidit.com>
Content-Type: text/plain; charset="UTF-8"

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.