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#compdef sort gsort

local args variant
local ordering='(-d --dictionary-order -g --general-numeric-sort -M --month-sort -h --human-numeric-sort -n --numeric-sort --sort -V --version-sort --help --version)'

args=(
  '(-c --check -C)-c[check whether input is sorted; do not sort]'
  '(-m --merge)'{-m,--merge}'[merge already sorted files; do not sort]'
  '(-o --output)'{-o+,--output=}'[write result to file instead of standard output]:output file:_files'
  \*{-T+,--temporary-directory=}'[specify directory for temporary files]:directory:_directories'
  '(-u --unique)'{-u,--unique}'[with -c, check for strict ordering; without -c, output only the first of an equal run]'
  "$ordering"{-d,--dictionary-order}'[consider only blanks and alphanumeric characters]'
  '(-f --ignore-case)'{-f,--ignore-case}'[fold lower case to upper case characters]'
  '(-i --ignore-nonprinting)'{-i,--ignore-nonprinting}'[consider only printable characters]'
  "$ordering"{-n,--numeric-sort}'[compare according to string numerical value]'
  '(-r --reverse)'{-r,--reverse}'[reverse the result of comparisons]'
  '(-b --ignore-leading-blanks)'{-b,--ignore-leading-blanks}'[ignore leading blanks]'
  '(-t --field-separator)'{-t+,--field-separator=}'[specify field separator instead of non-blank to blank transition]:separator'
  '(-k --key)'{-k+,--key=}'[specified start and end fields for key]:key field'
)

_pick_variant -r variant gnu=GNU $OSTYPE --version
case $variant in
  dragonfly*|netbsd*|openbsd*|freebsd*|gnu)
    args+=(
      '(-s --stable)'{-s,--stable}'[preserve original order of lines with the same key]'
    )
  ;|
  openbsd*|freebsd*|gnu)
    args+=(
      '(-c --check -C)-C[check whether input is sorted; do not sort]'
      '(-z --zero-terminated)'{-z,--zero-terminated}'[end lines with 0 byte, not newline]'
    )
  ;|
  freebsd*|gnu)
    args+=(
      '(-c --check -C)--check=-[check whether input is sorted; do not sort]::bad line handling:(diagnose-first silent quiet)'
      "$ordering"{-g,--general-numeric-sort}'[compare according to general numeric value]'
      "$ordering"{-M,--month-sort}"[compare (unknown) < 'JAN' < ... < 'DEC']"
      "$ordering"{-h,--human-numeric-sort}'[compare human readable numbers (e.g., 2K 1G)]'
      "$ordering"{-R,--random-sort}'[sort by random hash of keys]'
      "$ordering"{-V,--version-sort}'[sort version numbers]'
      "$ordering--sort=[sort according to ordering]:ordering:(general-numeric human-numeric month numeric random version)"
      '(-i --ignore-nonprinting)'{-i,--ignore-nonprinting}'[consider only printable characters]'
      '--random-source=[get random bytes from file]:file:_files'
      '--batch-size=[maximum inputs to merge]:number'
      '--compress-program=[specify program to compress temporary files with]:program:(gzip bzip2 lzop xz)'
      '--debug[annotate the of the line used to sort]'
      '--files0-from=[read input files from file]:file:_files'
      '(-S --buffer-size)'{-S+,--buffer-size=}'[specify size for main memory buffer]:size'
      '(- *)--help[display help and exit]'
      '(- *)--version[output version information and exit]'
    )
  ;|
  netbsd*|dragonfly*)
    args+=(
      "${ordering}-l[sort by string length of field]"
      "(-s)-S[don't use stable sort]"
    )
  ;|
  openbsd*)
    args+=(
      '-H[use a merge sort instead of a radix sort]'
      '-R[specify record separator]:separator'
    )
  ;|
  gnu)
    args+=( '--parallel=[set number of sorts run concurrently]:number' )
  ;;
  freebsd*)
    args+=( --radixsort  --mergesort --qsort --heapsort --mmap )
  ;;
  *) args=( "${(@)args:#(|\(*\))(|\*)--*}" ) ;;
esac

_arguments -s -S $args '*:file:_files'