#compdef unexpand

local all tabs ret=1
local -a args

all="convert all whitespace, instead of just initial whitespace"
tabs="use comma separated list of tab positions"
args=( 
    "(--all)-a[$all]"
    "(--tabs)-t[$tabs]:tablist"
    "*:file:_files"
)

if _pick_variant gnu="Free Soft" unix --version; then
    args+=(
        "(-a)--all[$all]"
        "--first-only[convert only leading sequences of whitespace]"
        "(-t)--tabs=[$tabs]:tablist"
        "(* -)--help[display help message and exit]"
        "(* -)--version[output version information and exit]"
    )
fi

_arguments "$args[@]" && ret=0

return ret