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#compdef df

local curcontext="$curcontext" state state_descr line args spec ret=1
local -A opt_args

if _pick_variant gnu=GNU unix --version; then
  args=(
    '--total[produce a grand total]'
    '(-T --print-type)'{-T,--print-type}'[print file system type]'
    '(-a --all)'{-a,--all}'[include dummy file systems]'
    '(-l --local)'{-l,--local}'[limit listing to local file systems]'
    '*'{-t+,--type=}'[limit listing to file systems of specified type]:file system type:_file_systems'
    '*'{-x+,--exclude-type=}'[exclude file systems of specified type]:file system type:_file_systems'
    '(--no-sync)--sync[invoke sync before getting usage info]'
    '(--sync)--no-sync[do not invoke sync before getting usage info (default)]'
    '-v[(ignored)]'
    '(- : *)--help[display help and exit]'
    '(- : *)--version[output version information and exit]'
    '*:files:_umountable'
    - '(format)'
    {-B+,--block-size=}'[specify block size]:size (bytes)'
    '-k[like --block-size=1K]'
    {-P,--portability}'[use the POSIX output format]'
    {-h,--human-readable}'[print sizes in human readable format]'
    {-H,--si}'[human readable format, but use powers of 1000 not 1024]'
    {-i,--inodes}'[list inode information instead of block usage]'
  )
elif [[ "$OSTYPE" == (darwin|freebsd|dragonfly)* ]]; then
  args=(
    '(-b -g -H -h -k -m)-b[use 512-byte blocks (default)]'
    '(-b -g -H -h -k -m)-g[use 1024^3-byte blocks]'
    '(-b -g -H -h -k -m)-H[human-readable output (base 10)]'
    '(-b -g -H -h -k -m)-h[human-readable output (base 2)]'
    '(-b -g -H -h -k -m)-k[use 1024-byte blocks]'
    '(-b -g -H -h -k -m)-m[use 1024*1024-byte blocks]'
    '-P[POSIX compliant output]'
    '-a[show all mount points]'
    '-c[display a grand total]'
    '-i[include inode usage statistics (default)]'
    '-l[only display locally-mounted file systems]'
    '-n[use previously obtained statistics]'
    '*:files:_umountable'
  )
  spec='[only display file systems of specified types]:file system type:->fslist'
  case "$OSTYPE" in
    (darwin*)
      args+=(
        "-T+$spec"
        "!-t+$spec" # obsolete
      )
      ;;
    (freebsd*|dragonfly*)
      args+=( "-t+$spec" '-T[include file system type]' )
      ;;
  esac
else
  # POSIX
  args=(
    '-k[use 1024-byte blocks]'
    '-P[POSIX compliant output]'
    '-t[include total allocated-space figures in the output]'
    '*:files:_umountable'
  )
fi

_arguments -C -s -S : $args && ret=0

case "$state" in
  (fslist)
    [[ ! -prefix *, ]] && ! compset -P 'no' &&
        _describe -t list-prefixes 'prefix to list' \
        '( no:exclude\ file\ system\ types\ in\ the\ list )' && ret=0
    _sequence -s , _file_systems && ret=0
    ;;
esac

return ret