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#compdef xz unxz xzcat=unxz lzma=xz unlzma=unxz lzcat=unxz -redirect-,<,unxz=unxz -redirect-,>,xz=unxz -redirect-,<,xz=xz -value-,XZ_OPT,-default- -value-,XZ_DEFAULTS,-default-

local decompress files expl state line curcontext="$curcontext" ret=1
typeset -A opt_args

files=( '(--files --files0)*:files:->files' )
case "$service" in
  *XZ_*)
    compset -q
    words=( fake "$words[@]" )
    (( CURRENT++ ))
    files=()
  ;&
  xz) decompress=no;&
  unxz) _arguments -C -s -S "$files[@]" \
    '--robot[use machine-parsable messages]' \
    + 'common' \
    '(I -k --keep)'{-k,--keep}"[keep (don't delete) input files]" \
    '(I -f --force)'{-f,--force}'[force overwrite]' \
    '(I -c --stdout)'{-c,--stdout}'[write on standard output]' \
    '(I)*'{-q,--quiet}'[suppress all warnings]' \
    '(I)*'{-v,--verbose}'[verbose mode]' \
    '(I * --files --files0)--files=-[read list of files to process from file]::file:_files' \
    '(I * --files --files0)--files0=-[read null terminated list of files to process from file]::file:_files' \
    '(I -F --format)'{-F+,--format=}'[specify file format]:format:(auto xz lzma lzip raw)' \
    '(I -T --threads)'{-T+,--threads=}'[use specified number of threads]:threads [1]' \
    '(I -M --memlimit --memory)'{-M+,--memlimit=,--memory=}'[set memory usage limit]: :_numbers -u bytes "memory limit" KiB MiB GiB %\:percentage\ of\ available\ RAM' \
    '(I)--no-adjust[give error if settings exceed memory limit]' \
    '(I -Q --no-warn)'{-Q,--no-warn}'[make warnings not affect exit status]' \
    + 'comp' \
    "(I decomp)"{-z,--compress}'[compress]' \
    '(I decomp -e --extreme)'{-e,--extreme}'[try to improve compression ratio by using more CPU time]' \
    '(I decomp -S --suffix)'{-S+,--suffix=}'[use specified suffix for compressed files]:suffix [.xz]' \
    '(I decomp -C --check)'{-C+,--check=}'[integrity check type]:check type:(none crc32 crc64 sha256)' \
    '(I decomp)--block-size=[start a new .xz block after specified bytes of input]:size' \
    '(I decomp)--block-list=[start a new .xz block after specified intervals of uncompressed data]:size' \
    '(I decomp)--flush-timeout=[specify maximum time between flushing of output]:time (ms) [0]' \
    '(I decomp)--memlimit-compress=[set memory usage limit for compression]: :_numbers -u bytes "memory limit" KiB MiB GiB %\:percentage\ of\ available\ RAM' \
    + 'decomp' \
    '(I comp level filters)'{-d,--decompress}'[decompress]' \
    '(I comp level filters)'{-t,--test}'[test compressed file integrity]' \
    '(I comp level filters)'{-l,--list}'[list information about .xz files]' \
    "(I comp level filters)--ignore-check[don't verify integrity when decompressing]" \
    '(I comp level filters)--single-stream[decompress only the first stream]' \
    "(I comp level filters)--no-sparse[don't create sparse files when decompressing]" \
    '(I comp level filters)--memlimit-decompress=[set memory usage limit for decompression]: :_numbers -u bytes "memory limit" KiB MiB GiB %\:percentage\ of\ available\ RAM' \
    '(I comp level filters)--memlimit-mt-decompress=[set memory usage limit for multi‐threaded decompression]: :_numbers -u bytes "memory limit" KiB MiB GiB %\:percentage\ of\ available\ RAM' \
    + '(I)' \
    '(* comp decomp level filters common)--info-memory[display amount of RAM and memory usage limits]' \
    '(- *)'{-h,--help}'[display help message]' \
    '(- *)'{-H,--long-help}'[display the long help (lists also the advanced options)]' \
    '(* comp decomp level filters common)'{-V,--version}'[display version number]' \
    + '(level)' \
    '(I filters decomp)-'{-best,-fast,1,2,3,4,5,6,7,8,9} \
    + filters \
    '(I level decomp --extreme)'--{x86,powerpc,ia64,arm,armthumb,arm64,sparc}=-'[add a branch/call/jump filter]::option:->bcj-options' \
    '(I level decomp --extreme)'--lzma{1,2}=-'[add lzma filter]::option:->lzma-options' \
    '(I level decomp --extreme)--delta=-[add delta filter]::option:->delta-options' && ret=0
  ;;
esac

case $state in
  files)
    (( $+opt_args[-z] || $+opt_args[--compress] )) && decompress=no
    [[ -n ${(k)opt_args[(i)decomp*]} ]] && unset decompress
    if [[ -z "$decompress" ]]; then
      _description files expl 'compressed file'
      _files "$expl[@]" -g '*.(xz|txz||lz|lzma|tlz)(-.)' && return
    else
      _description files expl 'file to compress'
      _files "$expl[@]" -g '^*.(xz|txz|lz|lzma|tlz)(-.)' && return
    fi
  ;;
  lzma-options)
    _values -s , options 'preset:preset' 'dict:size' 'lc:context bits' \
      'lp:position bits' 'pb:position bites' 'mf:matchfinder:(hc3 hc4 bt2 bt3 bt4)' \
      'mode:mode:(fast normal)' 'nice:length' 'depth:depth' && ret=0
  ;;
  bcj-options)
    _values options 'start:offset' && return
  ;;
  delta-options)
    _values options 'dist:distance' && return
  ;;
esac

return ret