less bad set config value

lib/hobo/config.rb

@@ -1,5 +1,6 @@
 module Hobo
   module_function
+  
   def config
     @@config
   end
@@ -10,15 +11,18 @@ module Hobo
 
   def set_config_value(chain, val, cfg=@@config)
     keys = chain.split('.')
+
     return if keys.empty?
 
-    key = keys.shift.to_sym
-    if keys.empty? 
-      raise InvalidSettingAlteration if cfg[key].instance_of?(Hash)
-      return cfg[key] = val if keys.empty?
+    if keys.length == 1
+      # If we're out of keys and the value for this key is not a leaf blow up
+      raise InvalidSettingAlteration if cfg[keys.first.to_sym].is_a?(Hash)
+      
+      # set the value and return if the value is a leaf
+      return cfg[keys.first.to_sym] = val
     end
 
-    set_config_value(keys.join('.'), val, cfg[key])    
+    set_config_value(keys[1..-1].join('.'), val, cfg[keys.first.to_sym])    
   end
 
   class InvalidSettingAlteration < StandardError; end

test/hobo/config_test.rb

@@ -14,7 +14,7 @@ class ConfigTest < Test::Unit::TestCase
 
     should "prevent the alteration of a non leaf setting value" do
       assert_raise Hobo::InvalidSettingAlteration do
-        Hobo.set_config_value('a', 2)
+        Hobo.set_config_value 'a', 2
       end
     end