#compdef unexpand gunexpand

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 usage information]'
    '(* -)--version[output version information]'
  )
fi

_arguments -s -S "$args[@]" && ret=0

return ret