make rack tell you when a request goes wonky

lib/assets/javascripts/flowerbox.js.coffee

@@ -1,7 +1,3 @@
-#= require_self
-#= require flowerbox/result
-#= require flowerbox/exception
-#
 Flowerbox =
   debug: false
   ping: ->
@@ -37,3 +33,25 @@ Flowerbox =
 
   fail: ->
 
+class Flowerbox.Exception
+  constructor: (@source, @name, @stack) ->
+
+  toJSON: ->
+    { status: Flowerbox.Result.FAILURE, source: @source, name: @name, trace: { stack: @stack } }
+
+class Flowerbox.Result
+  @SUCCESS = 'success'
+  @PENDING = 'pending'
+  @UNDEFINED = 'undefined'
+  @FAILURE = 'failure'
+  @SKIPPED = 'skipped'
+
+  constructor: (data) ->
+    for key, value of data
+      this[key] = value
+
+    this.status ||= Flowerbox.Result.SKIPPED
+    this.failures ||= []
+
+  toJSON: => this
+

lib/assets/javascripts/flowerbox/exception.js.coffee

@@ -1,5 +0,0 @@
-class Flowerbox.Exception
-  constructor: (@source, @name, @stack) ->
-
-  toJSON: ->
-    { status: Flowerbox.Result.FAILURE, source: @source, name: @name, trace: { stack: @stack } }

lib/assets/javascripts/flowerbox/result.js.coffee

@@ -1,17 +0,0 @@
-Flowerbox ||= {}
-
-class Flowerbox.Result
-  @SUCCESS = 'success'
-  @PENDING = 'pending'
-  @UNDEFINED = 'undefined'
-  @FAILURE = 'failure'
-  @SKIPPED = 'skipped'
-
-  constructor: (data) ->
-    for key, value of data
-      this[key] = value
-
-    this.status ||= Flowerbox.Result.SKIPPED
-    this.failures ||= []
-
-  toJSON: => this

lib/flowerbox/rack.rb

@@ -17,7 +17,18 @@ module Flowerbox
 
         result
       else
-        [ 200, { 'Content-type' => 'text/html' }, [ runner.template ] ]
+        begin
+          template = runner.template
+
+          [ 200, { 'Content-type' => 'text/html' }, [ template ] ]
+        rescue => e
+          $stderr.puts
+          $stderr.puts e.message
+          $stderr.puts e.backtrace.join("\n")
+          $stderr.puts
+
+          [ 500, {}, [] ]
+        end
       end
     end
   end