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#compdef telnet

# Parameter used:
#
#  telnet_hosts_ports_users
#    The array that contains 3-tuples `host:port:user'.

local state line expl
typeset -A opt_args

if (( ! $+_telnet_short )); then
  local k help="$(telnet -\? < /dev/null 2>&1)"
  local -A optionmap
  optionmap=( "[-8]" '-8[allow 8-Bit data]' \
              "[-E]" '-E[disable an escape character]' \
              "[-K]" '-K[no automatic login]' \
              "[-L]" '-L[allow 8-Bit data on output]' \
              "[-N]" '-N[supress reverse lookup]' \
              "[-S tos]" '-S+:IP type-of-service:' \
              "[-X atype]" '-X+:authentication type to disable:' \
              "[-a]" '-a[attempt automatic login]' \
              "[-c]" '-c[disable .telnetrc]' \
              "[-d]" '-d[debug mode]' \
              "[-e char]" '-e+[specify escape character]:escape character:' \
              "[-f/" '-f' \
              "/-F]" '-F' \
              "[-k realm]" '-k+:realm:' \
              "[-l user]" '-l+[specify user]:user:->users' \
              "[-n tracefile]" '-n+[specify tracefile]:tracefile:_files' \
              "[-r]" '-r[rlogin like user interface]' \
              "[-s src_addr]" '-s+[set source IP address]:src_addr:' \
              "[-x]" '-x' \
              "[-t transcom]" '-t+:transcom:' )

  _telnet_short=()
  for k in ${(k)optionmap}
  do
    [[ "$help" = *"$k"* ]] &&
      _telnet_short=( "$_telnet_short[@]" "$optionmap[$k]" )
  done

  # _arguments cannot handle following three options.
  optionmap=( "[-noasynch]" '-noasynch' \
              "[-noasyncnet]" '-noasyncnet' \
              "[-noasynctty]" '-noasynctty' )

  _telnet_long=()
  for k in ${(k)optionmap}
  do
    [[ "$help" = *"$k"* ]] &&
      _telnet_long=( "$_telnet_long[@]" "$optionmap[$k]" )
  done
fi

[[ $#_telnet_long != 0 && (
     -z "$compconfig[option_prefix]" ||
     "$compconfig[option_prefix]" = *\!${words[1]}* ||
     "$PREFIX" = [-+]* ) ]] && {
  _description expl 'option'
  _describe -o option _telnet_long "$expl[@]"
}

_arguments -s \
  "$_telnet_short[@]" \
  ':host:->hosts' \
  ':port:->ports'

case "$state" in
hosts)
  _description expl 'host'
  _combination telnet_hosts_ports_users \
    ${opt_args[-l]:+users=${opt_args[-l]:q}} \
    hosts "$expl[@]"
  ;;

ports)
  _description expl 'port'
  _combination telnet_hosts_ports_users \
    ${opt_args[-l]:+users=${opt_args[-l]:q}} \
    hosts="${line[2]:q}" \
    ports "$expl[@]"
  ;;

users)
  _description expl 'user'
  _combination telnet_hosts_ports_users \
    ${line[2]:+hosts="${line[2]:q}"} \
    ${line[3]:+ports="${line[3]:q}"} \
    users "$expl[@]"
  ;;
esac