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From: scowles@ckhb.org
To: Zsh Users <zsh-users@zsh.org>
Subject: CONDITIONAL EXPRESSIONS, string == pattern
Date: Sat, 24 Jul 2021 19:14:28 -0700 (PDT)	[thread overview]
Message-ID: <ae9325b1-1a8a-1384-3bd0-2286348843e@ckhb.org> (raw)

I would like to execute test on patterns that are dynamically generated and that 
change between invocations depending on other data.  When I generate a scalar 
parameter containing the pattern, construct the test statement, then invoke it, 
the test fails.  However, if I force an eval on the test statement, the test 
succeeds.  I do not understand zsh parsing in this case.  Could someone please 
let me know the mechanics I am missing?

thanks very much.

zsh version:  5.8, patch 460
platform:  x64, ubu 21.04, current patches

# test code begin:

unset vs vp r
local -a r

vs=' str1  a2'

r=( ${(f)"$( eval echo 'test ${vs} == ${vp} && echo hi || echo lo' )"} )
echo ${r[-1]}

test ${vs} == ${vp} && echo hi || echo lo

# test code end.

first test output:   hi
second test output:  lo

             reply	other threads:[~2021-07-25  2:15 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-25  2:14 scowles [this message]
2021-07-25  3:30 ` Eric Cook
2021-07-25  3:48   ` Lawrence Velázquez

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