Compiles coffeescripts to js in the background, preserving directory structure

compile-coffeescript.watchr

# Run me with:
#   $ watchr compile.watchr

# --------------------------------------------------
# Rules
# --------------------------------------------------
watch( '^Resources/cs/(.*\.coffee)'                       )  { |m| coffee m }


# --------------------------------------------------
# Signal Handling
# --------------------------------------------------
Signal.trap('INT' ) { abort("\n") } # Ctrl-C
Signal.trap('QUIT' ) { coffee everything } # Ctrl-\

# --------------------------------------------------
# Helpers
# --------------------------------------------------

def coffee(*paths)
  if paths[0].is_a?(Array)
    paths = paths[0]
  end
  paths.each do |i|  
    if (i.is_a?(MatchData))
      input = i[0].to_s
      output_dir = i[0].to_s
    else
      puts "#{i}\n"
      input = i.clone
      output_dir = i.clone
    end
    output_dir.sub!(/\/(\w*\.coffee)/, '')
    output_dir.sub!(/cs/, 'js')
    FileUtils.mkdir_p output_dir
    run "coffee -c -o #{output_dir} #{input}"
  end
end

def everything
  scripts = Dir['Resources/cs/**/*.coffee']
  scripts.flatten
end

def run( cmd )
  puts   cmd
  puts system cmd
end

I was using 0.9.4! Thanks!