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#compdef ln gln zf_ln

local curcontext="$curcontext" state line ret=1 variant
local -A opt_args

local -a args opts=( -A '-*' )
args=(
  '(-i)-f[remove existing destination files]'
  '-s[create symbolic links instead of hard links]'
)

_pick_variant -r variant -b zsh gnu=gnu $OSTYPE --help
case $variant; in
  gnu)
    opts=()
    args=(
      '(-b --backup)-b[create a backup of each existing destination file]' \
      '(-b --backup)--backup=[create a backup of each existing destination file]::method:((
          none\:"never create backups"
          off\:"never create backups"
          numbered\:"create numbered backup"
          t\:"create numbered backup"
          existing\:"same as numbered if numbered backups exist, otherwise same as simple"
          nil\:"same as numbered if numbered backups exist, otherwise same as simple"
          simple\:"always create simple backups"
          never\:"always create simple backups"))'
      '(-d -F --directory)'{-d,-F,--directory}'[allow the superuser to attempt to hard link directories]'
      '(-f --force)'{-f,--force}'[remove existing destination files]'
      '(-i --interactive)'{-i,--interactive}'[prompt before removing destination files]'
      '(-L --logical)'{-L,--logical}'[create hard links to symbolic link references]'
      '(-n --no-dereference)'{-n,--no-dereference}'[treat destination symbolic link to a directory as if it were a normal file]'
      '(-P --physical)'{-P,--physical}'[create hard links directly to symbolic links]'
      '(-r --relative)'{-r,--relative}'[create symbolic links relative to link location]'
      '(-s --symbolic)'{-s,--symbolic}'[create symbolic links instead of hard links]'
      '(-S --suffix)'{-S,--suffix=}'[override default backup suffix]:suffix'
      '(-t --target-directory)'{-t,--target-directory=}'[specify directory in which to create the links]: :_directories'
      '(-T --no-target-directory)'{-T,--no-target-directory}'[treat destination as a normal file]'
      '(-v --verbose)'{-v,--verbose}'[print name of each linked file]'
      '--help[display usage information and exit]'
      '--version[display version information and exit]')
    ;;
  zsh)
    args+=(
      '-d[attempt to hard link directories]'
      {-h,-n}'[do not dereference destination]'
      '(-f)-i[prompt before removing destination files]')
    ;;
  darwin*|dragonfly*|freebsd*|netbsd*|openbsd*)
    args+=(
      {-h,-n}'[do not dereference destination]'
    )
    ;|
  darwin*|dragonfly*|freebsd*|netbsd*)
    args+=(
      '-F[remove existing destination directories]'
      '(-f)-i[prompt before removing destination files]'
      '-v[print name of each linked file]'
    )
    ;|
  dragonfly*|freebsd*|netbsd*|openbsd*)
    args+=(
      '(-L)-P[create hard links directly to symbolic links]'
      '(-P)-L[create hard links to symbolic link references]'
    )
    ;|
  dragonfly*|freebsd*|netbsd*)
    args+=(
      "-w[warn if source of a symbolic link doesn't currently exist]"
    )
    ;;
esac

_arguments -C -s -S $opts : \
  $args \
  ':link target:_files' \
  '*:: :->files' && ret=0

case $state in
  (files)
    if [[ $variant == gnu && -n ${opt_args[(I)-t|--target-directory]} ]]; then
      _wanted files expl 'link target' _files && ret=0
    else
      if (( CURRENT == 2 )); then
        local expl
        _wanted files expl 'additional link target or link name' _files && ret=0
      else
        _alternative \
          'link-targets:additional link target:_files' \
          'target-directories:target directory:_directories' && ret=0
      fi
    fi
    ;;
esac

return ret