#compdef uniq guniq

local args

args=(
  '(-c --count -u --unique)'{-c,--count}'[prefix lines by the number of occurrences]'
  '(-d --repeated -u --unique -D --all-repeated)'{-d,--repeated}'[only print a single copy of duplicate lines]'
  '(--all-repeated -d --repeated -u --unique)-D[print all duplicate lines]'
  '(-D -d --repeated -u --unique)--all-repeated=-[print all duplicate lines]::delimit method [none]:(none prepend separate)'
  '(-f --skip-fields)'{-f,--skip-fields=}'[avoid comparing initial fields]:number of fields'
  '--group=-[show all items]::group separation [separate]:(separate prepend append both)'
  '(-i --ignore-case)'{-i,--ignore-case}'[ignore differences in case when comparing]'
  '(-s --skip-chars)'{-s+,--skip-chars=}'[avoid comparing initial characters]:number of characters'
  '(-u --unique -c --count -d --repeated -D --all-repeated)'{-u,--unique}'[only print unique lines]'
  '(-w --check-chars)'{-w+,--check-chars=}'[specify maximum number of characters to compare]:characters'
  '(-z --zero-terminated)'{-z,--zero-terminated}'[delimit lines with null character, not newline]'
  '(- *)--help[display help information]'
  '(- *)--version[display version information]'
)

if ! _pick_variant gnu=Free\ Soft unix --version; then
  local optchars="cdufs"
  if [[ "$OSTYPE" == (darwin|dragonfly|freebsd|openbsd)* ]]; then
    optchars+=i
  fi
  [[ $OSTYPE = (darwin|freebsd)* ]] && optchars+=D
  args=( ${(M)args:#(|\*)(|\(*\))-[$optchars]*} )
fi

_arguments "$args[@]" \
  '1::input file:_files' \
  '2::output file:_files'