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#compdef dig

_dns_types() {
  local expl
  _description dns-types expl 'DNS type'
  compadd "$@" "$expl[@]" -M 'm:{a-z}={A-Z}' \
      ANY A AAAA AFSDB APL AXFR CAA CDNSKEY CDS CERT CNAME DHCID DLV DNAME \
      DNSKEY DS HIP HINFO IPSECKEY IXFR KEY KX LOC MX NAPTR NS NSEC NSEC3 \
      NSEC3PARAM OPT PTR RRSIG RP SIG SOA SPF SRV SSHFP TA TKEY TLSA TSIG TXT
}

local curcontext="$curcontext" state line expl
local -a alts args
[[ -prefix + ]] && args=(
  '*+'{no,}'tcp[use TCP instead of UDP for queries]'
  '*+'{no,}'ignore[ignore truncation in UDP responses]'
  '*+domain=[set search list to single domain]:domain:_hosts'
  '*+'{no,}'search[use search list defined in resolv.conf]'
  '*+'{no,}'showsearch[show intermediate results in domain search]'
  '*+'{no,}'aaonly[set aa flag in the query]'
  '*+'{no,}'adflag[set the AD (authentic data) bit in the query]'
  '*+'{no,}'cdflag[set the CD (checking disabled) bit in the query]'
  '*+'{no,}'cl[display the CLASS whening printing the record]'
  '*+'{no,}'ttlid[display the TTL whening printing the record]'
  '*+'{no,}'recurse[set the RD (recursion desired) bit in the query]'
  '*+'{no,}'nssearch[search all authoritative nameservers]'
  '*+'{no,}'trace[trace delegation down from root]'
  '*+'{no,}'cmd[print initial comment in output]'
  '*+'{no,}'short[print terse output]'
  '*+'{no,}'identify[print IP and port of responder]'
  '*+'{no,}'comments[print comment lines in output]'
  '*+'{no,}'stats[print statistics]'
  '*+'{no,}'qr[print query as it was sent]'
  '*+'{no,}'question[print question section of a query]'
  '*+'{no,}'answer[print answer section of a reply]'
  '*+'{no,}'authority[print authority section of a reply]'
  '*+'{no,}'additional[print additional section of a reply]'
  '*+'{no,}'all[set all print/display flags]'
  '*+time=[set query timeout]:timeout (seconds)'
  '*+tries=[specify number of UDP query attempts]:tries'
  '*+retry=[specify number of UDP query retries]:retries'
  '*+ndots=[specify number of dots to be considered absolute]:dots'
  '*+bufsize=[specify UDP buffer size]:size (bytes)'
  '*+edns=[specify EDNS version for query]:version (0-255)'
  '*+noedns[clean EDNS version]'
  '*+'{no,}'multiline[verbose multi-line output]'
  '*+'{no,}'onesoa[AXFR prints only one soa record]'
  '*+'{no,}"fail[don't try next server on SERVFAIL]"
  '*+'{no,}'besteffort[try to parse even malformed messages]'
  '*+'{no,}'dnssec[request DNSSEC records]'
  '*+'{no,}'sigchase[chase DNSSEC signature chains]'
  '*+trusted-key=[specify file conrtaing trusted kets]:file:_files'
  '*+'{no,}'topdown[do DNSSEC validation in top down mode]'
  '*+'{no,}'nsid[include EDNS name server ID request in query]'
)
_arguments -s -C $args \
  '(- *)-h[display help information]' \
  '(- *)-v[display version information]' \
  '*-c+[specify class]:class:compadd -M "m:{a-z}={A-Z}" - IN CS CH HS' \
  '*-b+[specify source IP]:IP' \
  '*-f+[batch mode, read arguments from file]:file:_files' \
  '*-m[enable memory usage debugging]' \
  '*-p+[specify port number]:port:_ports' \
  '*-4[use IPv4 only]' \
  '*-6[use IPv6 only]' \
  '*-t+[specify type]:type:_dns_types' \
  '*-q+[specify host name to query]:host:_hosts' \
  '*-x+[reverse lookup]:IP address' \
  '*-k+[specify TSIG key file]:file:_files' \
  '*-y+[specify TSIG key]:hmac\:name\:key' \
  '*: :->args' && ret=0

if [[ -n $state ]]; then
  if compset -P @; then
    _wanted hosts expl 'DNS server' _hosts && ret=0;
  else
    case $#line in
      <3->) alts+=( 'classes:query class:compadd -M "m:{a-z}={A-Z}" - IN CS CH HS' ) ;&
      2) alts+=( 'types:query type:_dns_types' ) ;;
    esac
    _alternative 'hosts:host:_hosts' $alts && ret=0
  fi
fi

return ret