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Date: Sat, 01 Nov 2014 23:09:41 -0400
From: Sonny Michaud <michaud.sonny@gmail.com>
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To: Zsh Users <zsh-users@zsh.org>
Subject: Re: Sundry Completion Questions ($_ $(^^) $(!!:s//)
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Thanks for the response, it really clarifies a lot.  I did not have 
_expand in my completer, but I see how it ends up producing gibberish.

On 11/01/2014 10:08 PM, Bart Schaefer wrote:
> On Nov 1, 2014 5:39 PM, "Sonny Michaud" <michaud.sonny@gmail.com> wrote:
>> 1) I noticed that $_<TAB> does not expand.
> It expands for me.  It doesn't expand to anything very useful, because its
> value changes during the execution of the completion functions, but it does
> expand.
>
> Do you have _expand in your "completer" zstyle?
>
>> 2) Quick history substitution does not expand in subcommands.
> Quick history substitution is a command-line construct, not a command
> syntax construct.  It only works when the quick-history character appears
> as the first character of the input buffer.
>
>> 3) Since the above does not work, I usually use $(!!:s/foo/bar), which
> has bizarre behavior, depending on whether or not a trailing slash is
> provided.
>
> History syntax doesn't interact with shell command syntax in the way you
> are expecting.  *Everything* after the second slash, *including* the
> closing paren, is part of the history reference unless you close the
> history syntax by adding the third slash.
>
> History substitution is a purely lexical replacement which occurs before
> any shell-syntax analysis of the input is performed.
>