In Your Face

#!/usr/bin/env ruby
require "rubygems"
require "opencv"

include OpenCV

class IChat
  
  def available!
    tell_me_to "set status to available"
  end

  def away!
    tell_me_to "set status to away"
  end
   
  def tell_me_to(message)
    lines = ['tell application "System Events"', 
             'if exists process "iChat" then', 
              'tell application "iChat"', 
              message, 
              'end tell', 
              'end if', 
              'end tell']
    cmd = "-e '#{lines.join("' -e '")}'" 
    system "osascript #{cmd}"
  end
end

camera = CvCapture.open
face_detector = CvHaarClassifierCascade::load("haarcascade_frontalface_alt.xml")
ichat = IChat.new
check_every = 10

while true
  image = camera.query
  faces = face_detector.detect_objects(image)
  if faces.empty?
    ichat.away!
  else
    ichat.available!
  end
  sleep(check_every)
end