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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 options

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

  # _arguments cannot handle following three options.
  _telnet_long=()
  [[ "$help" = *"[-noasynch]"* ]] &&
    _telnet_long=("$_telnet_long[@]" '-noasynch')
  [[ "$help" = *"[-noasyncnet]"* ]] &&
    _telnet_long=("$_telnet_long[@]" '-noasyncnet')
  [[ "$help" = *"[-noasynctty]"* ]] &&
    _telnet_long=("$_telnet_long[@]" '-noasynctty')
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 \
    ${options[-l]:+users=${options[-l]:q}} \
    hosts "$expl[@]"
  ;;

ports)
  _description expl 'port'
  _combination telnet_hosts_ports_users \
    ${options[-l]:+users=${options[-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