Allow the for grepping message bodies from the web frontend

Fixes #6
Fixes #8

src/ratpack/handlebars/topic-watch.html.hbs

@@ -1,10 +1,18 @@
 {{> header}}
 
 <div class="container">
-    <div class="progress" style="width: 100px;">
-    <div class="progress-bar progress-bar-striped" role="progressbar" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100" style="width: 100%">
-        <span class="sr-only">Loading..</span>
-    </div>
+    <div class="container">
+        <div class="progress" style="width: 100px;">
+        <div class="progress-bar progress-bar-striped" role="progressbar" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100" style="width: 100%">
+            <span class="sr-only">Loading..</span>
+        </div>
+        </div>
+
+        <div>
+            <form id="grep" role="form">
+                <input id="grepfield" class="form-control" type="search" placeholder="grep for.." size="20"/>
+            </form>
+        </div>
     </div>
 
     <div id="messages">
@@ -15,5 +23,13 @@
 <script src="/js/ws.js?1"></script>
 <script type="text/javascript">
     watchTopic("{{name}}");
+
+    $('#grep').submit(function(e) {
+        if (window.ws) {
+            window.ws.send($('#grepfield').val());
+        }
+        $('#grepfield').blur();
+        e.preventDefault();
+    });
 </script>
 {{> footer}}

src/ratpack/ratpack.groovy

@@ -44,16 +44,16 @@ ratpack {
         }
 
         get('topics/:name/websocket') { ctx ->
-            println "creating thingies"
             def client = new OfftopicClient(Configuration.instance)
-            println "client: ${client}"
+            def grepper = null
 
             websocket(ctx) { ws ->
                 println "Connected ${ws}"
                 client.onMessageCallback = { m ->
-                    println "called back with ${m}"
-                    ws.send(groovy.json.JsonOutput.toJson(m))
-                    println "sent message"
+                    println "called back with ${m} (grep: ${grepper})"
+                    if ((grepper == null) || (m.raw =~ grepper)) {
+                        ws.send(groovy.json.JsonOutput.toJson(m))
+                    }
                 }
                 client.createSubscribersFor(pathTokens.name)
                 print "subscribers created for ${pathTokens.name}"
@@ -63,7 +63,7 @@ ratpack {
                     client.shutdown()
                 }
                 sock.onMessage { msg ->
-                    println "client sent ${msg}"
+                    grepper = msg.text
                 }
             }
         }