Awesome

Guard::Rack

Want to restart your Rack development with rackup whilst you work? Now you can!

guard 'rack', :port => 9292 do
  watch('Gemfile.lock')
  watch(%r{^(config|lib|app)/.*})
end

:cmd is the command to run to mount the Rack application (default rackup).
:host is the host ip address to run on (default 0.0.0.0).
:port is the port number to run on (default 9292).
:environment is the environment to use (default development).
:start_on_start will start the server when starting Guard (default true).
:force_run kills any process that's holding open the listen port before attempting to (re)start Rack (default false).
:daemon runs the server as a daemon, without any output to the terminal that ran guard (default false).
:debugger runs the server with the debugger enabled (default false). Required ruby-debug gem.
:timeout waits this number of seconds when restarting the Rack server before reporting there's a problem (default 20).
:server serve using server (one of webrick, mongrel or thin).
:config run the specified rackup file (default config.ru).

Fork the project. Make your feature addition or bug fix with tests. Send a pull request. Bonus points for topic branches.

MIT License, see LICENSE for details.