Initial commit.

README

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+= Summary
+
+  Allows using the 'super' keyword in methods of reopened classes.
+  Simple and elegant alternative to alias_method_chain for redifining methods while keeping access to the previous definition.
+
+= Examples
+
+  class Post
+    def text
+      @text.strip
+    end
+  end
+
+  class Post
+    override :text
+    def text
+      super.reverse
+    end
+  end

Rakefile

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+require 'rake/gempackagetask'
+require 'pathname'
+require 'yaml'
+
+def gem
+  RUBY_1_9 ? 'gem19' : 'gem'
+end
+
+def all_except(paths)
+  Dir['**/*'] - paths.map {|path| path.strip.gsub(/^\//,'').gsub(/\/$/,'') }
+end
+
+spec = Gem::Specification.new do |s|
+  s.name            = 'override'
+  s.version         = '0.5.0'
+  s.summary         = "Allows using 'super' in methods of reopened classes."
+  s.description     = "Provides a simple and elegant alternative to alias_method_chain for redifining methods, while keeping access to the previous defenition."
+  s.author          = "Martin Aumont"
+  s.email           = 'mynyml@gmail.com'
+  s.homepage        = ''
+  s.has_rdoc        = true
+  s.require_path    = "lib"
+  s.files           = Dir['**/*']
+end
+
+Rake::GemPackageTask.new(spec) do |p|
+  p.gem_spec = spec
+end
+
+
+desc "Remove package products"
+task :clean => :clobber_package
+
+desc "Update the gemspec for GitHub's gem server"
+task :gemspec do
+  Pathname("#{spec.name}.gemspec").open('w') {|f| f << YAML.dump(spec) }
+end
+
+desc "Install gem"
+task :install => [:clobber, :package] do
+  sh "#{SUDO} #{gem} install pkg/#{spec.full_name}.gem"
+end
+
+desc "Uninstall gem"
+task :uninstall => :clean do
+  sh "#{SUDO} #{gem} uninstall -v #{spec.version} -x #{spec.name}"
+end
+

lib/override.rb

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+#original idea: http://github.com/wycats/merb/blob/677d08b9dd972367369a509987264ded25e70f9a/merb-core/lib/merb-core/core_ext/class.rb
+class Class
+  def override(*names)
+    mod = Module.new
+    names.each do |name|
+      method = self.instance_method(name.to_sym)
+      mod.module_eval { send(:define_method, name.to_sym, method) }
+      include mod
+    end
+  end
+end

test/test_helper.rb

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+#require 'pathname'
+require 'test/unit'
+require 'rubygems'
+require 'context'
+require 'matchy'
+#require 'zebra'
+#require 'mocha'
+begin
+  require 'ruby-debug'
+  require 'quietbacktrace'
+rescue LoadError, RuntimeError
+  # pass
+end

test/test_override.rb

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+require 'pathname'
+root  =  Pathname(__FILE__).dirname.parent
+require root.join('test/test_helper')
+require root.join('lib/override')
+
+class OverrideTest < Test::Unit::TestCase
+  context "Override" do
+    context "in reopened class" do
+      before do
+        class ::A
+          def a() 'canada' end
+          define_method(:b) { 'brazil' }
+        end
+      end
+      after do
+        Object.send(:remove_const, :A)
+        lambda { ::A }.should raise_error(NameError) #make sure ::A is unset
+      end
+      test "allows using 'super' keyword" do
+        class ::A
+          override(:a)
+          def a() super + '&montreal' end
+        end
+        A.new.a.should be('canada&montreal')
+      end
+      test "works with dynamically defined methods" do
+        class ::A
+          override(:b)
+          def b() super + '&saopaulo' end
+        end
+        A.new.b.should be('brazil&saopaulo')
+      end
+      test "accepts multiple method names" do
+        class ::A
+          override(:a,:b)
+          def a() super + '&montreal' end
+          def b() super + '&saopaulo' end
+        end
+        A.new.a.should be('canada&montreal')
+        A.new.b.should be('brazil&saopaulo')
+      end
+    end
+  end
+end