NoBacksies is a callback layer built on top of Ruby's built-in callback methods. It makes it possible to add new callbacks very easily, without having to fuss with more nuanced issues of defining and redefining callback methods.
NoBacksies does not currently work with Rubinius. Anyone know why?
Here is a very simple example of how NoBacksies works.
class Y include NoBacksies::Callbacks def self.list @list ||=  end callback :method_added do |method| list << method end def foo; end def bar; end end Y.list #=> [:foo, :bar]
Here is another example taken from the Anise project.
class Y include Anise include NoBacksies def self.doc(string) callback :method_added, :once=>true do |method| self.ann(method, :doc=>string) end end doc "foo is cool" def foo # ... end end Y.ann(:foo, :doc) #=> "foo is cool"
See the QED documentation for more examples.
Install the RubyGems package in the usual fashion.
$ gem install no_backsies
Source code is hosted on GitHub. If you'd like to submit a patch please fork the repository and submit a pull request (ideally in a topic branch).
QED is used to testing.
$ gem install qed
To run the tests:
$ qed [path/to/test]
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(BSD 2 License)
Copyright © 2011 Thomas Sawyer
Unless otherwise negotiated with the original author, NoBacksies is distributable under the terms of the BSD 2-clause license.
See the LICENSE.rdoc file for details.