zsh/Completion/X/Command/_vnc

#compdef vncserver vncviewer xvncviewer

local displays args
displays=( ~/.vnc/$HOST:<->.pid(N:r:t:s/$HOST//) )
displays=( \\${^displays} ) 

case $service in
  vncserver)
    # currently lacking Xvnc arguments
    _arguments \
      - start \
	'-name:desktop name:_x_name' \
	'-geometry:geometry:(1600x1200 1280x1024 1152x864 1024x768 800x600 640x480)' \
	'-depth:pixel depth:(8 16 24 32)' \
	'-pixelformat:pixel format' \
	'1::display number:_guard "(|:[0-9]#)"' \
      - kill \
	"-kill:display number:($displays)" \
      - help \
	'-help'
  ;;
  *vncviewer) 
    _xt_arguments -shared -viewonly -fullscreen -bgr233 -owncmap -truecolour \
      '-encodings:encodings:_values -s " " copyrect hextile corre rre raw' \
      '-depth:depth' \
      '-passwd:file:_files' \
      '(1)-listen:display number' \
      '(-listen)1::display:_x_display'
  ;;
esac