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#compdef whois fwhois

_whois () {
  _whois_setup
  case "$0" in
  fwhois) _whois_fwhois;;
  *) $_whois_comp;;
  esac
}

(( $+functions[_whois_setup] )) ||
_whois_setup () {
  (( $+_whois_defaultserver )) ||
    _whois_defaultserver='whois.internic.net'

  (( $+_whois_servers )) || {
    typeset -gUa _whois_servers
    _whois_servers=(
      $_whois_defaultserver
      domain-registry.nl
      is.nic.pw
      whois.apnic.net:p
      whois.arin.net:a
      whois.aunic.net
      whois.berkeley.edu
      whois.cdnnet.ca
      whois.dns.pt
      whois.funet.fi
      whois.gb.com
      whois.gb.net
      whois.internic.net
      whois.jpl.nasa.gov
      whois.nic-se.se
      whois.nic.ad.jp
      whois.nic.af
      whois.nic.as
      whois.nic.br
      whois.nic.bt
      whois.nic.ch
      whois.nic.cx
      whois.nic.fr
      whois.nic.gov:g
      whois.nic.hm
      whois.nic.it
      whois.nic.li
      whois.nic.lk
      whois.nic.mil:d
      whois.nic.mx
      whois.nic.nu
      whois.nic.or.kr
      whois.nic.sh
      whois.nic.tj
      whois.nic.tm
      whois.nic.uk
      whois.ripe.net:r
      whois.ripn.net:R
      whois.sics.se
      whois.stanford.edu
      whois.uk.com
      www.nic.at
      $(functions -m '_whois:*' |
	awk '/^undefined _whois:/ {print substr($2,8,length($2)-7)}
	     /^_whois:/ {print substr($1,8,length($1)-7)}')
    )
  }

  (( $+_whois_arguments )) || {
    local help="$(whois </dev/null 2>&1)"
    local tmp opt opts
    local hostopt=-h+

    if [[ $help = *"user[@<whois.server>]"* ]]; then
      _whois_comp=_whois_fwhois
    elif [[ $help = *(name\ ...|OBJECT...)* ]]; then
      _whois_comp=_whois_multi
    else
      _whois_comp=_whois_single
      hostopt=-h
    fi

    _whois_arguments=()

    if [[ $help = *"-p PORT"* ]]; then
      _whois_arguments=("$_whois_arguments[@]"
        '-p[port]:port:_whois_ports'
      )
    fi

    tmp="${(j::)${(@)${(@M)_whois_servers:#*:?}##*:}}" 
    if [[ $help = (#b)*\[-([$tmp]##)\]* ]]; then
      tmp=(${(s::)match[1]})
    else
      tmp=()
    fi

    if [[ $help = *"-h host"* ]]; then
      tmp=($tmp h)
    fi

    for opt in $tmp; do
      opts=(-${^tmp:#$opt})
      if (( $#opts )); then opts="($opts)"; else opts=; fi
      if [[ $opt = h ]]; then
	_whois_arguments=("$_whois_arguments[@]"
	  "${opts}${hostopt}:host:_whois_hosts")
      else
	_whois_arguments=("$_whois_arguments[@]"
	  "${opts}-${opt}[${${(@M)_whois_servers:#*:$opt}%:?}]")
      fi
    done
  }
}

_whois_single () {
  local curcontext="$curcontext" state line expl
  typeset -A opt_args
  local tmp host

  _arguments -C \
    "$_whois_arguments[@]" \
    ':identifier:->identifier'

  case "$state" in
  identifier)
    if [[ -z "$QIPREFIX" && -z "$PREFIX" ]]; then
      compadd -QS '' \'
      return
    fi
    compset -q
    host="${opt_args[-h]:-$_whois_defaultserver}"
    for tmp in $_whois_servers; do
      if [[ $tmp = *:? && $+opt_args[-${tmp##*:}] -ne 0 ]]; then
	host="${tmp%:?}"
        break
      fi
    done
    if (( $+functions[_whois:$host] )); then
      "_whois:$host" "$expl[@]"
    else
      _message "identifier"
    fi
    ;;
  esac
}

_whois_multi () {
  local curcontext="$curcontext" state line expl
  typeset -A opt_args
  local tmp host

  _arguments -C \
    "$_whois_arguments[@]" \
    '*::identifier:->identifier'

  case "$state" in
  identifier)
    host="${opt_args[-h]:-$_whois_defaultserver}"
    for tmp in $_whois_servers; do
      if [[ $tmp = *:? && $+opt_args[-${tmp##*:}] -ne 0 ]]; then
	host="${tmp%:?}"
        break
      fi
    done
    if (( $+functions[_whois:$host] )); then
      "_whois:$host" "$expl[@]"
    else
      _message "identifier"
    fi
    ;;
  esac
}

_whois_fwhois () {
  if compset -P '*@'; then
    _whois_hosts "$@"
  else
    if [[ -z "$QIPREFIX" && -z "$PREFIX" ]]; then
      compadd -QS '' \'
      return
    fi
    compset -q
    host="$_whois_defaultserver"
    if (( $+functions[_whois:$host] )); then
      "_whois:$host" "$@"
    else
      _message "identifier"
    fi
  fi
}

_whois_hosts () {
  _tags hosts &&
    compadd "$@" \
      -M 'm:{a-zA-Z}={A-Za-z} r:|.=* r:|=*' \
      - ${_whois_servers%:?} || _hosts "$@"
}

_whois_ports () {
  _tags ports && compadd "$@" - whois || _ports "$@"
}

(( $+functions[_whois:whois.internic.net] )) ||
_whois:whois.internic.net () {
  if (( CURRENT == 1 )); then
    local expl

    _wanted strings expl string && compadd "$expl[@]" HELP DOMAIN HOST
  else
    _message 'string'
  fi
}

(( $+functions[_whois:whois.nic.ad.jp] )) ||
_whois:whois.nic.ad.jp () {
  if (( CURRENT == 1 )); then
    local expl

    _wanted strings expl string && compadd HELP DOM NET HOST PERSON CONN COM
  else
    _message 'string'
  fi
}

_whois "$@"