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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <130116191415.ZM22284@torch.brasslantern.com>
Date: Wed, 16 Jan 2013 19:14:15 -0800
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To: zsh-users@zsh.org
Subject: Re: Completing all possible candidates
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On Jan 15,  8:28am, Jesper Nyg=E5rds wrote:
}
} _my-prev-result() {
}     local hstring
}     if [[ $WIDGET =3D *-all-* ]]; then
}         compstate[insert]=3Dall
}     fi
}     # Run last command again, save output in hstring
}     hstring=3D$(eval $(fc -l -n -1))

You probably ought to put double quotes around the inner $(...), because
without them in that context it's subject to word splitting and then the
eval will split the resulting words again.

}     # Split items on new-line into an array, quote each item
}     compadd - ${(@f)hstring}
} }

I'm glad the example worked well for you.