zsh/Completion/Linux/Command/_iwconfig

#compdef iwconfig

local curcontext="$curcontext" state line expl ret=1

_arguments -C \
  '(1 * -)--help[display help information]' \
  '(1 * -)--version[display version information]' \
  '1:network interface:_net_interfaces' \
  '*:parameter:->parameters' && ret=0

if [[ -n "$state" ]]; then
  local -a arg

  case $words[CURRENT-1] in
    essid)  _wanted -x names expl 'network name' compadd off any on ;;
    nwid|domain) _message -e ids 'network id' ;;
    freq|channel) _message -e channels 'channel or frequency' ;;
    sens) _message -e levels 'signal level' ;;
    mode)
      _wanted modes expl 'operating mode' compadd \
          Ad-Hoc Managed Master Repeater Secondary Monitor Auto
    ;;
    ap) _message -e access-points 'access point' ;;
    nick*) _message -e names 'nickname' ;;
    rate|bit*) _message -e bit-rates 'bit rate' ;;
    rts*|frag*) _message -e sizes 'size' ;;
    key|enc*) _message -e keys 'key' ;;
    power)
      arg=(
        \*{min,max}'[modifier]'
	'*off[disable power management]'
	'*on[enable power management]'
	'*all[receive all packets]'
	'unicast[receive unicast packets only]'
	'multicast[receive multicast and broadcast packets only]'
      )
    ;&
    min|max)
      _values -S ' ' -w 'parameter' \
        'period[set the period between wake ups]' \
	'timeout[set timeout before sleep]' \
	$arg[@] && ret=0
    ;;
    period|timeout) _message -e timeouts 'timeout' ;;
    txpower) _message -e power 'transmit power' ;;
    retry) _message -e retries 'retries' ;;
    *)
      _values -S ' ' -w 'option' \
      	'essid[set the network name]' \
	'(nwid domain)'{nwid,domain}'[set the network ID]' \
	'(freq channel)'{freq,channel}'[set the operating frequency or channel]' \
	'sens[set the sensitivity threhold]' \
      	'mode[set operating mode]' \
	'ap[register with given access point]' \
	'(nick nickname)'nick{,name}'[set the nickname]' \
	'(rate bit)'{rate,bit}'[set the bitrate]' \
	'rts[set packet size threshold for sending RTS]' \
	'frag[set maximum packet fragment size]' \
	\*{key,enc}'[add encryption key]' \
	'*power[manipulate power management scheme parameters]' \
	'txpower[set transmit power]' \
	'retry[set number of retries]' \
	'commit[apply changes imediately]' && ret=0
    ;;
  esac
fi

return ret