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#compdef gzip gunzip gzcat=gunzip pigz unpigz -redirect-,<,gunzip=gunzip -redirect-,>,gzip=gunzip -redirect-,<,gzip=gzip -value-,GZIP,-default-

local decompress files expl curcontext="$curcontext" state line ret=1
local -a pigz
typeset -A opt_args
local excl="--decompress --uncompress -1 -2 -3 -4 -5 -6 -7 -8 -9 -11 --best"

files=( '*:files:->files' )
case "$service" in
unpigz|pigz)
  pigz=(
    '(-K --zip)'{-K,--zip}'[compress to PKWare zip format]'
    '(-b --blocksize)'{-b+,--blocksize}'[set compression block size]:size (KiB)'
    '(-p --processes)'{-p,--processes}'[specify number of processes to use]'
    '(-z --zlib)'{-z,--zlib}'[compress to zlib (.zz) format]'
    '(-T --no-time)'{-T,--no-time}"[don't store/restore modification time in/from header]"
  )
;|
pigz)
  pigz+=(
    '(-i --independent)'{-i,--independent}'[compress blocks independently to allow for damage recovery]'
    "($excl)-11"
    '(--rsyncable)-R[make rsync-friendly archive]'
    "($excl)"{-F,--first}'[do iterations first, before block split]'
    "($excl)"{-I+,--iterations}'[specify number of iterations for optimization]:iterations [15]'
    "($excl)"{-M+,--maxsplits}'[specify maximum number of split blocks]:split blocks [15]'
    "($excl)"{-O,--oneblock}"[don't split into smaller blocks]"
  )
;|
*GZIP*)
  compset -q
  words=( fake "$words[@]" )
  (( CURRENT++ ))
  files=()
  ;&
gunzip|zcat|unpigz)
  decompress=yes
  ;&
gzip|pigz)
  _arguments -C -s -S \
    '(--to-stdout --stdout)-c[write on standard output]' \
    '(-c --stdout)--to-stdout[write on standard output]' \
    '(-c --to-stdout)--stdout[write on standard output]' \
    "($excl)"{-d,--decompress,--uncompress}'[decompress]' \
    '(--force)-f[force overwrite]' \
    '(-f)--force[force overwrite]' \
    '(- *)'{-h,--help}'[display help message]' \
    "(--keep)-k[don't delete input files]" \
    "(-k)--keep[don't delete input files]" \
    '(--list)-l[list compressed file contents]' \
    '(-l)--list[list compressed file contents]' \
    '(- *)'{-L,--license}'[display software license]' \
    "(--no-name)-n[don't save or restore the original name and time stamp]" \
    "(-n)--no-name[don't save or restore the original name and time stamp]" \
    '(--name)-N[save or restore the original name and time stamp]' \
    '(-N)--name[save or restore the original name and time stamp]' \
    '(--quiet --silent)-q[suppress all warnings]' \
    '(-q --silent)--quiet[suppress all warnings]' \
    '(-q --quiet)--silent[suppress all warnings]' \
    '(--recursive)-r[operate recursively on directories]' \
    '(-r)--recursive[operate recursively on directories]' \
    '(-R)--rsyncable[make rsync-friendly archive]' \
    '(--suffix)-S+[specify suffix for compressed files]:suffix:' \
    '(-S)--suffix=[specify suffix for compressed files]:suffix:' \
    '(--test)-t[test compressed file integrity]' \
    '(-t)--test[test compressed file integrity]' \
    '(--verbose)-v[verbose mode]' \
    '(-v)--verbose[verbose mode]' \
    '(- *)'{-V,--version}'[display version number]' \
    "($excl)"-{-fast,1,2,3,4,5,6,7,8,9,-best} \
    "$pigz[@]" "$files[@]" && ret=0
  ;;
esac

case "$state" in
files)
  (( $+opt_args[-d] || $+opt_args[--decompress] || $+opt_args[--uncompress] ||
     $+opt_args[-l] || $+opt_args[--list] ||
     $+opt_args[-t] || $+opt_args[--test] )) &&
    decompress=yes
  if (( $+opt_args[-r] || $+opt_args[--recursive] )); then
    if [[ -z "$decompress" ]]; then
      _description directories expl 'directory to compress'
      _files "$expl[@]" -/ && return
    else
      _description directories expl 'compressed directory'
      _files "$expl[@]" -/ && return
    fi
  else
    if [[ -z "$decompress" ]]; then
      _description files expl 'file to compress'
      _files "$expl[@]" -g '^*.(([tT]|)[gG]|)[zZ](-.)' && return
    else
      _description files expl 'compressed file'
      if (( $+opt_args[-f] )); then
	_files "$expl[@]" && return
      else
	_files "$expl[@]" -g '*.(([tT]|)[gG]|)[zZ](-.)' && return
      fi
    fi
  fi
  ;;
esac

return ret