Added ActiveSupport::BacktraceCleaner and Rails::BacktraceCleaner for cutting down on backtrace noise (inspired by the Thoughtbot Quiet Backtrace plugin) [DHH]

3 files changed, 46 insertions, 3 deletions

diff --git a/railties/lib/initializer.rb b/railties/lib/initializer.rb
index 16abe62d1b..fcf6ea3feb 100644
--- a/railties/lib/initializer.rb
+++ b/railties/lib/initializer.rb
@@ -39,6 +39,14 @@ module Rails
         nil
       end
     end
+    
+    def backtrace_cleaner
+      @@backtrace_cleaner ||= begin
+        # Relies on ActiveSupport, so we have to lazy load to postpone definition until AS has been loaded
+        require 'rails/backtrace_cleaner'
+        Rails::BacktraceCleaner.new
+      end
+    end
 
     def root
       if defined?(RAILS_ROOT)
diff --git a/railties/lib/rails/backtrace_cleaner.rb b/railties/lib/rails/backtrace_cleaner.rb
new file mode 100644
index 0000000000..ffc5ef42aa
--- /dev/null
+++ b/railties/lib/rails/backtrace_cleaner.rb
@@ -0,0 +1,34 @@
+module Rails
+  class BacktraceCleaner < ActiveSupport::BacktraceCleaner
+    ERB_METHOD_SIG = /:in `_run_erb_.*/
+    
+    VENDOR_DIRS  = %w( vendor/plugins vendor/gems vendor/rails )
+    MONGREL_DIRS = %w( lib/mongrel bin/mongrel )
+    RAILS_NOISE  = %w( script/server )
+    RUBY_NOISE   = %w( rubygems/custom_require benchmark.rb )
+
+    ALL_NOISE    = VENDOR_DIRS + MONGREL_DIRS + RAILS_NOISE + RUBY_NOISE
+  
+
+    def initialize
+      super
+      add_filter   { |line| line.sub(RAILS_ROOT, '') }
+      add_filter   { |line| line.sub(ERB_METHOD_SIG, '') }
+      add_silencer { |line| ALL_NOISE.any? { |dir| line.include?(dir) } }
+    end
+  end
+
+
+  # For installing the BacktraceCleaner in the test/unit
+  module BacktraceFilterForTestUnit #:nodoc:
+    def self.included(klass)
+      klass.send :alias_method_chain, :filter_backtrace, :cleaning
+    end
+  
+    def filter_backtrace_with_cleaning(backtrace)
+      backtrace = filter_backtrace_without_cleaning(backtrace)
+      backtrace = backtrace.first.split("\n") if backtrace.size == 1
+      Rails.backtrace_cleaner.clean(backtrace)
+    end
+  end
+end
\ No newline at end of file
diff --git a/railties/lib/rails_generator/generators/applications/app/app_generator.rb b/railties/lib/rails_generator/generators/applications/app/app_generator.rb
index 347ce6352c..e52dcadd4d 100644
--- a/railties/lib/rails_generator/generators/applications/app/app_generator.rb
+++ b/railties/lib/rails_generator/generators/applications/app/app_generator.rb
@@ -62,9 +62,10 @@ class AppGenerator < Rails::Generator::Base
       m.template "configs/routes.rb", "config/routes.rb"
 
       # Initializers
-      m.template "configs/initializers/inflections.rb", "config/initializers/inflections.rb"
-      m.template "configs/initializers/mime_types.rb", "config/initializers/mime_types.rb"
-      m.template "configs/initializers/new_rails_defaults.rb", "config/initializers/new_rails_defaults.rb"
+      m.template "configs/initializers/backtrace_silencers.rb", "config/initializers/backtrace_silencers.rb"
+      m.template "configs/initializers/inflections.rb",         "config/initializers/inflections.rb"
+      m.template "configs/initializers/mime_types.rb",          "config/initializers/mime_types.rb"
+      m.template "configs/initializers/new_rails_defaults.rb",  "config/initializers/new_rails_defaults.rb"
 
       # Locale
       m.template "configs/locales/en.yml", "config/locales/en.yml"