Added Extension extension to provide support for clean backtraces.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2623 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/CHANGELOG

 *SVN*
 
+* Added Extension extension to provide support for clean backtraces. [Nicholas Seckar]
+
 * Updated whiny nil to be more concise and useful. [Nicholas Seckar]
 
 * Added Enumerable#first_match [Nicholas Seckar]

activesupport/lib/active_support/core_ext/exception.rb

+class Exception
+  
+  alias :clean_message :message
+  
+  TraceSubstitutions = []
+  
+  def clean_backtrace
+    backtrace.collect do |line|
+      TraceSubstitutions.inject(line) do |line, (regexp, sub)|
+        line.gsub regexp, sub
+      end
+    end
+  end
+  
+  def application_backtrace
+    clean_backtrace.reject { |line| line =~ /(vendor|dispatch|ruby|script\/\w+)/ }
+  end
+end
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