Turn RJS debugging on by default and show the source code when an exception is caught [DHH]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4003 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/lib/action_view/helpers/prototype_helper.rb

@@ -433,8 +433,9 @@ module GeneratorMethods
           def to_s #:nodoc:
             returning javascript = @lines * $/ do
               if ActionView::Base.debug_rjs
-                javascript.replace "try {\n#{javascript}\n} catch (e) "
-                javascript << "{ alert('RJS error:\\n\\n' + e.toString()); throw e }"
+                source = javascript.dup
+                javascript.replace "try {\n#{source}\n} catch (e) "
+                javascript << "{ alert('RJS error:\\n\\n' + e.toString()); alert('#{source.gsub(/\r\n|\n|\r/, "\\n").gsub(/["']/) { |m| "\\#{m}" }}'); throw e }"
               end
             end
           end

railties/environments/development.rb

@@ -14,6 +14,7 @@
 # Show full error reports and disable caching
 config.action_controller.consider_all_requests_local = true
 config.action_controller.perform_caching             = false
+config.action_view.debug_rjs                         = true
 
 # Don't care if the mailer can't send
 config.action_mailer.raise_delivery_errors = false