Improved error reporting especially around never shallowing exceptions. Debugging helpers should be much easier now #980 [Nicholas Seckar]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@985 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 34 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/core_ext/load_error.rb b/activesupport/lib/active_support/core_ext/load_error.rb
new file mode 100644
index 0000000000..42f2d42e78
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/load_error.rb
@@ -0,0 +1,34 @@
+class MissingSourceFile < LoadError
+  attr_reader :path
+  def initialize(message, path)
+    super(message)
+    @path = path
+  end
+  
+  def self.from_message(message)
+    REGEXPS.each do |regexp, capture|
+      match = regexp.match(message)
+      return MissingSourceFile.new(message, match[capture]) unless match.nil?
+    end
+    nil
+  end
+  
+  REGEXPS = [
+    [/^no such file to load -- (.+)$/i, 1],
+    [/^Missing \w+ (file\s*)?([^\s]+.rb)$/i, 2],
+    [/^Missing API definition file in (.+)$/i, 1]
+  ]
+end
+
+module ActiveSupport
+  module CoreExtensions
+    module LoadErrorExtensions
+      module LoadErrorClassMethods
+        def new(*args)
+          (self == LoadError && MissingSourceFile.from_message(args.first)) || super
+        end
+      end
+      ::LoadError.extend(LoadErrorClassMethods)
+    end
+  end
+end
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