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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <131217102648.ZM8656@torch.brasslantern.com>
Date: Tue, 17 Dec 2013 10:26:48 -0800
In-reply-to: <l8po7s$1og$1@ger.gmane.org>
Comments: In reply to "Yuri D'Elia" <wavexx@users.sourceforge.net>
 "Expanding quotes" (Dec 17,  3:48pm)
References: <l8po7s$1og$1@ger.gmane.org>
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To: zsh-users@zsh.org
Subject: Re: Expanding quotes
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On Dec 17,  3:48pm, Yuri D'Elia wrote:
} Subject: Expanding quotes
}
} touch file file\' file\"
} ls *\"<TAB>
} 
} results in:
} 
} % ls file file\" file\'

Hmm, somewhere down in the completion internals the code that sets the
PREFIX string is re-quoting both the backslash and the single quote.
When this is re-interpolated by the expand-word code it turns into
the empty string, so you get the expansion of "*".

} % ls *[\']<TAB>
} 
} doesn't expand

Same problem, except you get the expansion of *[] which is an invalid
pattern and hence nothing.

There's a basic conflict in the completion system in that it can't "know"
if you mean for the literal string backslash-quote to be completed, or if
you mean for the backslash to have its usual semantic effect on the quote.