refresh chrome when a file changed in specified directory

refresh-chrome-change.rb

#!/usr/bin/env ruby
# watch.rb by Brett Terpstra, 2011 <http://brettterpstra.com>
# with credit to Carlo Zottmann <https://github.com/carlo/haml-sass-file-watcher>
# http://brettterpstra.com/2011/03/07/watch-for-file-changes-and-refresh-your-browser-automatically/

trap("SIGINT") { exit }

class String
  # colorization
  def colorize(color_code)
    "\e[#{color_code}m#{self}\e[0m"
  end

  def red
    colorize(31)
  end

  def green
    colorize(32)
  end

  def yellow
    colorize(33)
  end

  def blue
    colorize(34)
  end

  def pink
    colorize(35)
  end

  def light_blue
    colorize(36)
  end
end

if ARGV.length < 2
  puts "Usage: #{$0} watch_folder keyword"
  puts "Example: #{$0} . mywebproject"
  exit
end

filetypes = ['css','html','htm','php','rb','erb','less','js','inc']
watch_folder = ARGV[0]
keyword = ARGV[1]
puts "** Watching #{watch_folder} and subfolders for changes in project files...".blue

while true do
  files = []
  filetypes.each {|type|
    files += Dir.glob( File.join( watch_folder, "**", "*.#{type}" ) )
  }
  new_hash = files.collect {|f| [ f, File.stat(f).mtime.to_i ] }
  hash ||= new_hash
  diff_hash = new_hash - hash

  unless diff_hash.empty?
    hash = new_hash
    sleep 0.5
    diff_hash.each do |df|
      puts "** Detected change in #{df[0]}, refreshing".green
      %x{osascript<<ENDGAME
        	tell application "Google Chrome"
            set windowList to every window
            repeat with aWindow in windowList
              set tabList to every tab of aWindow
              repeat with atab in tabList
                if (URL of atab contains "#{keyword}") then
                  tell atab to reload
                end if
              end repeat
            end repeat
          end tell
ENDGAME
}
    end
  end

  sleep 1
end