watch.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>

trap("SIGINT") { exit }

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

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

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

    diff_hash.each do |df|
      puts "Detected change in #{df[0]}, refreshing"
      %x{osascript<<ENDGAME
        	tell application "Safari"
          	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 do javascript "window.location.reload()"
          			end if
          		end repeat
          	end repeat
        	end tell
ENDGAME
}
    end
  end

  sleep 1
end