lifo/Gemfile

## chat_ramp.rb
require 'vendor/gems/environment'

require 'cramp/controller'
require 'erubis'
require 'usher'

Cramp::Controller::Websocket.backend = :thin

module ChatRamp
  class HomeAction < Cramp::Controller::Action
    @@template = Erubis::Eruby.new(File.read('index.erb'))

    def start
      render @@template.result(binding)
      finish
    end
  end

  class SocketAction < Cramp::Controller::Websocket
    @@users = Set.new

    on_start :user_connected
    on_finish :user_left
    on_data :message_received

    def user_connected
      @@users << self
    end

    def user_left
      @@users.delete self
    end

    def message_received(data)
      @@users.each {|u| u.render data }
    end
  end
end

routes = Usher::Interface.for(:rack) do
  add('/').to(ChatRamp::HomeAction)
  add('/socket').to(ChatRamp::SocketAction)
end

Rack::Handler::Thin.run routes, :Port => 8080

## Gemfile
gem 'cramp'
gem 'erubis', '2.6.5'
gem 'usher', "0.6.0"

## index.erb
<!-- Taken from http://dev.eclipse.org/svnroot/rt/org.eclipse.jetty/jetty/trunk/test-jetty-webapp/src/main/webapp/ws/index.html -->

<html><head>
    <title>WebSocket Chat</title>
    <script type='text/javascript'>

      if (!window.WebSocket)
        alert("WebSocket not supported by this browser");

      function $() { return document.getElementById(arguments[0]); }
      function $F() { return document.getElementById(arguments[0]).value; }

      function getKeyCode(ev) { if (window.event) return window.event.keyCode; return ev.keyCode; }

      var room = {
        join: function(name) {
          this._username=name;
          var location = 'ws://<%= request.host_with_port %>/socket'
           // document.location.toString().replace('http:','ws:');
          this._ws=new WebSocket(location);
          this._ws.onopen=this._onopen;
          this._ws.onmessage=this._onmessage;
          this._ws.onclose=this._onclose;
        },

        _onopen: function(){
          $('join').className='hidden';
          $('joined').className='';
          $('phrase').focus();
          room._send(room._username,'has joined!');
        },

        _send: function(user,message){
          user=user.replace(':','_');
          if (this._ws)
            this._ws.send(user+':'+message);
        },

        chat: function(text) {
          if (text != null && text.length>0 )
              room._send(room._username,text);
        },

        _onmessage: function(m) {
          if (m.data){
            var c=m.data.indexOf(':');
            var from=m.data.substring(0,c).replace('<','&lt;').replace('>','&gt;');
            var text=m.data.substring(c+1).replace('<','&lt;').replace('>','&gt;');

            var chat=$('chat');
            var spanFrom = document.createElement('span');
            spanFrom.className='from';
            spanFrom.innerHTML=from+':&nbsp;';
            var spanText = document.createElement('span');
            spanText.className='text';
            spanText.innerHTML=text;
            var lineBreak = document.createElement('br');
            chat.appendChild(spanFrom);
            chat.appendChild(spanText);
            chat.appendChild(lineBreak);
            chat.scrollTop = chat.scrollHeight - chat.clientHeight;
          }
        },

        _onclose: function(m) {
          this._ws=null;
          $('join').className='';
          $('joined').className='hidden';
          $('username').focus();
          $('chat').innerHTML='';
        }

      };

    </script>
    <style type='text/css'>
    div { border: 0px solid black; }
    div#chat { clear: both; width: 40em; height: 20ex; overflow: auto; background-color: #f0f0f0; padding: 4px; border: 1px solid black; }
    div#input { clear: both; width: 40em; padding: 4px; background-color: #e0e0e0; border: 1px solid black; border-top: 0px }
    input#phrase { width:30em; background-color: #e0f0f0; }
    input#username { width:14em; background-color: #e0f0f0; }
    div.hidden { display: none; }
    span.from { font-weight: bold; }
    span.alert { font-style: italic; }
    </style>
</head><body>
<div id='chat'></div>
<div id='input'>
  <div id='join' >
    Username:&nbsp;<input id='username' type='text'/><input id='joinB' class='button' type='submit' name='join' value='Join'/>
  </div>
  <div id='joined' class='hidden'>
    Chat:&nbsp;<input id='phrase' type='text'/>
    <input id='sendB' class='button' type='submit' name='join' value='Send'/>
  </div>
</div>
<script type='text/javascript'>
$('username').setAttribute('autocomplete','OFF');
$('username').onkeyup = function(ev) { var keyc=getKeyCode(ev); if (keyc==13 || keyc==10) { room.join($F('username')); return false; } return true; } ;
$('joinB').onclick = function(event) { room.join($F('username')); return false; };
$('phrase').setAttribute('autocomplete','OFF');
$('phrase').onkeyup = function(ev) {   var keyc=getKeyCode(ev); if (keyc==13 || keyc==10) { room.chat($F('phrase')); $('phrase').value=''; return false; } return true; };
$('sendB').onclick = function(event) { room.chat($F('phrase')); $('phrase').value=''; return false; };
</script>

<p>
This is a demonstration of the <a href="http://m.onkey.org/2010/1/7/introducing-cramp">Cramp Framework</a>'s websocket capabiltiy using HTML from <a href="http://jetty.mortbay.org/">Jetty websocket server</a>.
</p>
</body></html>
	require 'vendor/gems/environment'

	require 'cramp/controller'
	require 'erubis'
	require 'usher'

	Cramp::Controller::Websocket.backend = :thin

	module ChatRamp
	class HomeAction < Cramp::Controller::Action
	@@template = Erubis::Eruby.new(File.read('index.erb'))

	def start
	render @@template.result(binding)
	finish
	end
	end

	class SocketAction < Cramp::Controller::Websocket
	@@users = Set.new

	on_start :user_connected
	on_finish :user_left
	on_data :message_received

	def user_connected
	@@users << self
	end

	def user_left
	@@users.delete self
	end

	def message_received(data)
	@@users.each {\|u\| u.render data }
	end
	end
	end

	routes = Usher::Interface.for(:rack) do
	add('/').to(ChatRamp::HomeAction)
	add('/socket').to(ChatRamp::SocketAction)
	end

	Rack::Handler::Thin.run routes, :Port => 8080
	<!-- Taken from http://dev.eclipse.org/svnroot/rt/org.eclipse.jetty/jetty/trunk/test-jetty-webapp/src/main/webapp/ws/index.html -->

	<html><head>
	<title>WebSocket Chat</title>
	<script type='text/javascript'>

	if (!window.WebSocket)
	alert("WebSocket not supported by this browser");

	function $() { return document.getElementById(arguments[0]); }
	function $F() { return document.getElementById(arguments[0]).value; }

	function getKeyCode(ev) { if (window.event) return window.event.keyCode; return ev.keyCode; }

	var room = {
	join: function(name) {
	this._username=name;
	var location = 'ws://<%= request.host_with_port %>/socket'
	// document.location.toString().replace('http:','ws:');
	this._ws=new WebSocket(location);
	this._ws.onopen=this._onopen;
	this._ws.onmessage=this._onmessage;
	this._ws.onclose=this._onclose;
	},

	_onopen: function(){
	$('join').className='hidden';
	$('joined').className='';
	$('phrase').focus();
	room._send(room._username,'has joined!');
	},

	_send: function(user,message){
	user=user.replace(':','_');
	if (this._ws)
	this._ws.send(user+':'+message);
	},

	chat: function(text) {
	if (text != null && text.length>0 )
	room._send(room._username,text);
	},

	_onmessage: function(m) {
	if (m.data){
	var c=m.data.indexOf(':');
	var from=m.data.substring(0,c).replace('<','<').replace('>','>');
	var text=m.data.substring(c+1).replace('<','<').replace('>','>');

	var chat=$('chat');
	var spanFrom = document.createElement('span');
	spanFrom.className='from';
	spanFrom.innerHTML=from+': ';
	var spanText = document.createElement('span');
	spanText.className='text';
	spanText.innerHTML=text;
	var lineBreak = document.createElement('br');
	chat.appendChild(spanFrom);
	chat.appendChild(spanText);
	chat.appendChild(lineBreak);
	chat.scrollTop = chat.scrollHeight - chat.clientHeight;
	}
	},

	_onclose: function(m) {
	this._ws=null;
	$('join').className='';
	$('joined').className='hidden';
	$('username').focus();
	$('chat').innerHTML='';
	}

	};

	</script>
	<style type='text/css'>
	div { border: 0px solid black; }
	div#chat { clear: both; width: 40em; height: 20ex; overflow: auto; background-color: #f0f0f0; padding: 4px; border: 1px solid black; }
	div#input { clear: both; width: 40em; padding: 4px; background-color: #e0e0e0; border: 1px solid black; border-top: 0px }
	input#phrase { width:30em; background-color: #e0f0f0; }
	input#username { width:14em; background-color: #e0f0f0; }
	div.hidden { display: none; }
	span.from { font-weight: bold; }
	span.alert { font-style: italic; }
	</style>
	</head><body>
	<div id='chat'></div>
	<div id='input'>
	<div id='join' >
	Username: <input id='username' type='text'/><input id='joinB' class='button' type='submit' name='join' value='Join'/>
	</div>
	<div id='joined' class='hidden'>
	Chat: <input id='phrase' type='text'/>
	<input id='sendB' class='button' type='submit' name='join' value='Send'/>
	</div>
	</div>
	<script type='text/javascript'>
	$('username').setAttribute('autocomplete','OFF');
	$('username').onkeyup = function(ev) { var keyc=getKeyCode(ev); if (keyc==13 \|\| keyc==10) { room.join($F('username')); return false; } return true; } ;
	$('joinB').onclick = function(event) { room.join($F('username')); return false; };
	$('phrase').setAttribute('autocomplete','OFF');
	$('phrase').onkeyup = function(ev) { var keyc=getKeyCode(ev); if (keyc==13 \|\| keyc==10) { room.chat($F('phrase')); $('phrase').value=''; return false; } return true; };
	$('sendB').onclick = function(event) { room.chat($F('phrase')); $('phrase').value=''; return false; };
	</script>

	<p>
	This is a demonstration of the <a href="http://m.onkey.org/2010/1/7/introducing-cramp">Cramp Framework</a>'s websocket capabiltiy using HTML from <a href="http://jetty.mortbay.org/">Jetty websocket server</a>.
	</p>
	</body></html>