-refactored _execute() for much better readability :-)

-added dependency for for ruby-debug-completion

-turned on auto-eval for ruby-debug

-added the ability to run debugger on the last line of a method: http://dancingpenguinsoflight.com/2009/09/an-improved-ruby-debugger-invocation/

Rakefile

@@ -4,20 +4,21 @@ require 'rake'
 begin
   require 'jeweler'
   Jeweler::Tasks.new do |gem|
-    gem.name = "aasm"
+    gem.name = 'aasm'
     gem.summary = %Q{State machine mixin for Ruby objects}
     gem.description = %Q{AASM is a continuation of the acts as state machine rails plugin, built for plain Ruby objects.}
-    gem.homepage = "http://rubyist.github.com/aasm/"
+    gem.homepage = 'http://rubyist.github.com/aasm/'
-    gem.authors = ["Scott Barron", "Scott Petersen", "Travis Tilley"]
+    gem.authors = ['Scott Barron', 'Scott Petersen', 'Travis Tilley']
-    gem.email = "scott@elitists.net, ttilley@gmail.com"
+    gem.email = 'scott@elitists.net, ttilley@gmail.com'
-    gem.add_development_dependency "rspec"
+    gem.add_development_dependency 'ruby-debug-completion'
-    gem.add_development_dependency "shoulda"
+    gem.add_development_dependency 'rspec'
+    gem.add_development_dependency 'shoulda'
     gem.add_development_dependency 'sdoc'
     # gem is a Gem::Specification... see http://www.rubygems.org/read/chapter/20 for additional settings
   end
   Jeweler::GemcutterTasks.new
 rescue LoadError
-  puts "Jeweler (or a dependency) not available. Install it with: sudo gem install jeweler"
+  puts 'Jeweler (or a dependency) not available. Install it with: sudo gem install jeweler'
 end
 
 require 'spec/rake/spectask'
@@ -38,7 +39,7 @@ begin
   end
 rescue LoadError
   task :rcov do
-    abort "RCov is not available. In order to run rcov, you must: sudo gem install spicycode-rcov"
+    abort 'RCov is not available. In order to run rcov, you must: sudo gem install spicycode-rcov'
   end
 end
 
@@ -66,7 +67,7 @@ begin
   end
 rescue LoadError
   task :reek do
-    abort "Reek is not available. In order to run reek, you must: sudo gem install reek"
+    abort 'Reek is not available. In order to run reek, you must: sudo gem install reek'
   end
 end
 
@@ -78,7 +79,7 @@ begin
   end
 rescue LoadError
   task :roodi do
-    abort "Roodi is not available. In order to run roodi, you must: sudo gem install roodi"
+    abort 'Roodi is not available. In order to run roodi, you must: sudo gem install roodi'
   end
 end
 
@@ -91,7 +92,7 @@ begin
     if File.exist?('VERSION')
       version = File.read('VERSION')
     else
-      version = ""
+      version = ''
     end
 
     rdoc.rdoc_dir = 'rdoc'
@@ -103,6 +104,6 @@ begin
     rdoc.template = 'direct'
   end
 rescue LoadError
-  puts "aasm makes use of the sdoc gem. Install it with: sudo gem install sdoc"
+  puts 'aasm makes use of the sdoc gem. Install it with: sudo gem install sdoc'
 end
 

lib/aasm/state_transition.rb

@@ -35,18 +35,11 @@ class AASM::SupportingClasses::StateTransition
   private
 
   def _execute(obj, on_transition, *args)
-    if on_transition.is_a?(Proc)
+    case on_transition
-      if on_transition.arity != 0
+    when Proc
-        on_transition.call(obj, *args)
+      on_transition.arity == 0 ? on_transition.call : on_transition.call(obj, *args)
-      else
+    when Symbol, String
-        on_transition.call
+      obj.send(:method, on_transition.to_sym).arity == 0 ? obj.send(on_transition) : obj.send(on_transition, *args)
-      end
-    elsif on_transition.is_a?(Symbol) || on_transition.is_a?(String)
-      if obj.send(:method, on_transition.to_sym).arity != 0
-        obj.send(on_transition, *args)
-      else
-        obj.send(on_transition)
-      end
     end
   end
 

spec/spec_helper.rb

@@ -6,6 +6,9 @@ require 'aasm'
 require 'spec'
 require 'spec/autorun'
 
+require 'ruby-debug'; Debugger.settings[:autoeval] = true; debugger; rubys_debugger = 'annoying'
+require 'ruby-debug/completion'
+
 Spec::Runner.configure do |config|
   
 end

test/test_helper.rb

@@ -23,8 +23,8 @@ class Test::Unit::TestCase
 end
 
 begin
-  require 'ruby-debug'
+  require 'ruby-debug'; Debugger.settings[:autoeval] = true; debugger; rubys_debugger = 'annoying'
-  Debugger.start
+  require 'ruby-debug/completion'
 rescue LoadError
 end