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 14 Jan 2016 01:19:34 -0800 (PST)
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From: Sebastian Gniazdowski <sgniazdowski@gmail.com>
Date: Thu, 14 Jan 2016 10:19:15 +0100
Message-ID: <CAKc7PVBMqngEu2KvyWvPVGYw7_zZ6DadpT+KV6msw9Mm8tkHCw@mail.gmail.com>
Subject: $( <Tab> has CURRENT=1, $(( <Tab> has CURRENT=0
To: Zsh hackers list <zsh-workers@zsh.org>
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X-Seq: zsh-workers 37617

Hello,
in both cases words array is empty, so CURRENT=3D0 seems to be more
logical value. Maybe something bigger is hidden behind this.

Here is a test code that might be employed to see this:

https://github.com/psprint/zsh-editing-workbench/blob/de33867898643e6161dd1=
72db6f8bab42f73083d/widen_for_history

It's enabled with:
autoload widen_for_history
zle -N widen_for_history
zstyle ':completion:*' completer widen_for_history _complete

Outputs of the code for $( <Tab> and $(( <Tab>

A CURRENT: 1, words: ><
B CURRENT: 1, words: >$( <
C CURRENT: 1, CURSR: 2, lft: |$(|, rght: ||, words: >$(<
PREFIX: |$(|, SUFFIX: ||
Calling _history
$(( 0 + 1 )) $(( 0 + 1 )) $(( =E8=A9=A6=E5=8F=A5=E7=9B=B8=E7=95=B6=E9=95=B7=
 ""  $(( 0 + 1 )) $( ( echo b ))
$(( echo b ) ) $(( echo a ) ) $(( 0 + 1 )) $(( 0 + 1 )) $(( i + 1 ))
$(( i + 1 )) $(( i + 1 )) $(( i+1 )) $(( i+1 )) $(( i+1 )) $(( i+1 ))
$(( i+1 ))

A CURRENT: 0, words: ><
B CURRENT: 0, words: >$(( <
C CURRENT: 1, CURSR: 4, lft: |$((|, rght: ||, words: >$((<
PREFIX: |$((|, SUFFIX: ||
Calling _history
$(( 0 + 1 )) $(( 0 + 1 )) $(( =E8=A9=A6=E5=8F=A5=E7=9B=B8=E7=95=B6=E9=95=B7=
 ""  $(( 0 + 1 )) $(( echo b ) )
$(( echo a ) ) $(( 0 + 1 )) $(( 0 + 1 )) $(( i + 1 )) $(( i + 1 )) $((
i + 1 )) $(( i+1 )) $(( i+1 )) $(( i+1 )) $(( i+1 )) $(( i+1 ))

Best regards,
Sebastian Gniazdowski