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emulate -L zsh
setopt extendedglob

local opt keys
integer stat

while getopts "k:" opt; do
    case $opt in
	(k)
	keys=$OPTARG
	;;

	(*)
	return 1
	;;
    esac
done
(( OPTIND > 1 )) && shift $(( OPTIND - 1 ))

local savelbuffer=$LBUFFER saverbuffer=$RBUFFER
local savepredisplay=$PREDISPLAY savepostdisplay=$POSTDISPLAY

LBUFFER=
RBUFFER=
PREDISPLAY="$PREDISPLAY$savelbuffer$saverbuffer$POSTDISPLAY
${1:-? }"
POSTDISPLAY=

if [[ -n $keys ]]; then
    zle -R
    read -k $keys
    stat=$?
else
    zle recursive-edit
    stat=$?
    (( stat )) || REPLY=$BUFFER
fi

LBUFFER=$savelbuffer
RBUFFER=$saverbuffer
PREDISPLAY=$savepredisplay
POSTDISPLAY=$savepostdisplay

return $stat