prepending actions so they can be added later yet still run first

lib/switchbox.rb

@@ -24,7 +24,11 @@ def condition(name, &block)
   end
 
   def action(*conditions, &block)
-    @actions << [lambda{ conditions.all?{|cond| self[cond]} }, block]
+    @actions << action_item( conditions, block )
+  end
+
+  def prepend_action(*conditions, &block)
+    @actions.unshift action_item( conditions, block )
   end
 
   def [](name)
@@ -37,5 +41,12 @@ def go
     action = @actions.find {|conds,act| conds.call }
     action.last.call if action
   end
+
+  private
+  def action_item(*args)
+    action = args.pop
+    conditions = args.flatten
+    [ lambda{ conditions.all? { |cond| self[cond] } }, action ]
+  end
 end
 

spec/switchbox_spec.rb

@@ -115,6 +115,14 @@
     @mango.should_not_receive :not_action
     @mango.should_not_receive :not_action_2
   end
+
+  it "should be able to prepend actions so that they get checked and ran first" do
+    @box.action(:true_cond) { @mango.first_action }
+    @box.prepend_action(:true_cond_2) { @mango.second_action }
+
+    @mango.should_receive     :second_action
+    @mango.should_not_receive :first_action
+  end
 end
 
 describe SwitchBox, "#new" do