#compdef compress uncompress -redirect-,<,uncompress=uncompress -redirect-,>,compress=uncompress -redirect-,<,compress=compress

local expl state line bits common_args1 common_args2 decompress ret=1
local curcontext="$curcontext"
typeset -A opt_args
bits=( {9..16} )

common_args1=( \
  '-n[omit compressed file header from compressed file]' \
  '-V[display current version and compile options]' \
  '*:files:->files')
common_args2=( \
  '-c[write on standard output]' \
  '(-F)-f[force overwrite]' \
  '(-f)-F[force overwrite]' \
  '(-v)-q[suppress display of compression statistics]' \
  '(-q)-v[display compression statistics]' \
  "${common_args1[@]}" )

case "$service" in
  compress)
    _arguments -C -s \
      "-b[specify maximum number of bits used to replace common substring]:bits:(${bits[*]})" \
      '-C[produce output compatible with BSD 2.0]' \
      '(-b -C)-d[decompress]' \
      "${common_args2[@]}" && ret=0
  ;;
  uncompress)
    _arguments -C -s "${common_args2[@]}" && ret=0
    decompress=yes
  ;;
  zcat)
    _arguments -C -s "${common_args1[@]}" && ret=0
    decompress=yes
  ;;
esac

if [[ "$state" = files ]]; then
  if [[ -z "$decompress" ]] || (( $+opt_args[-d] )); then
    _description files expl 'file to compress'
    _files "$expl[@]" -g '^*.Z(-.)' && return
  else
    _description files expl 'compressed file'
    _files "$expl[@]" -g '*.Z(-.)' && return
  fi
fi

return ret