livereload.rb

#!/usr/bin/ruby -rubygems

# This is a replacement for "livereload" gem for working with Rails.
# It watches the filesystem with OS X FSEvents rather than with EventMachine.
# This is better for large projects for wich EventMachine fails.
#
# Sass is supported; .sass files can also be stored in "app/styles/" directory.
#
# Command line options are "-D" to enable debug mode. All other parameters
# (if given) specify a list of directories to watch.
#
# Dependencies:
#   $ sudo /usr/bin/gem install mislav-rspactor em-websocket json haml

require 'rspactor'
require 'em-websocket'
require 'json'
require 'sass/plugin'

API_VERSION = '1.3'

web_sockets = []
debug = !!ARGV.delete('-D')
dirs = ARGV.empty?? [Dir.pwd] : ARGV

Sass::Plugin.add_template_location(Dir.pwd + '/app/styles')

listener = RSpactor::Listener.new(:extensions => %w[html erb haml rb sass yml css js], :relative_paths => false) { |files|
  for file in files
    case file
    when %r{/app/.+\.(erb|haml)$}, %r{/app/helpers/.+\.rb$}, %r{/public/.+\.(css|js|html)$}, %r{/config/locales/.+\.yml$}
      data = ['refresh', { :path => file, :apply_js_live  => false, :apply_css_live => true }].to_json
      puts data if debug
      web_sockets.each do |ws|
        ws.send data
      end
    when %r{\.sass$}
      Sass::Plugin.update_stylesheets
    end
  end
}

Sass::Plugin.on_updating_stylesheet do |template, css|
  listener.force_changed << File.expand_path(css, Dir.pwd)
end

EventMachine.run do
  puts "LiveReload is waiting for a browser to connect."
  EventMachine::WebSocket.start(:host => '0.0.0.0', :port => '10083', :debug => debug) do |ws|
    ws.onopen do
      begin
        puts "Browser connected."
        ws.send "!!ver:#{API_VERSION}"
        web_sockets << ws
      rescue
        puts $!
        puts $!.backtrace
      end
    end
  
    ws.onmessage do |msg|
      puts "Browser URL: #{msg}"
    end
  
    ws.onclose do
      web_sockets.delete ws
      puts "Browser disconnected."
    end
  end
  
  puts "Starting file watcher for directories: #{dirs.inspect}"
  listener.start(dirs)
  
  # Disable the RubyCocoa thread hook as apparently Laurent did not apply the
  # thread patches to the OS X system Ruby
  ENV['RUBYCOCOA_THREAD_HOOK_DISABLE'] = 'kampai'
  
  Thread.new { OSX.CFRunLoopRun }
end