Small fixes. Add (stolen) readme.

ruby/marcheiligers/README.md

@@ -0,0 +1,40 @@
+This README stolen from apauly's version and tweaked.
+
+How to run this Ruby version
+============================
+
+*   Change to this directory in a terminal
+
+*   Run prices.rb
+
+    > $ ruby prices.rb
+
+*   Look at the contents of pricefile.txt
+
+
+About the Code
+==============
+
+The example lends itself to a simple Product/Fruit object hierarchy,
+which is totally not what I've used here. Unlike _apauly_, instead I've 
+decided that products are products, but there are Rules which change 
+how a Product's markup and shelf life is calculated.
+
+The extra supplier logic is something which does not fit in with the
+_apualy_'s hierarchy, doesn't exist in this example. Instead all Products
+are tested against all Rules and those rules that match a product are
+applied. There are the basic fruit rules which set markup % and shelf
+life in days, and then the special Supplier rules which actually
+override the way the calculations are done. All the rules use some mild
+meta-programming, which I like.
+
+Some interesting features:
+* Rules are never actually instantiated. 
+* It's really easy to add additional Rules, both for new types of Fruit
+and for new Supplier "issues". But, there's no support for Supplier rules
+that apply to the same product. I haven't thought about how one might 
+implement that using this solution.
+* The actual LabelPrinter class just pulls functionality from the 3
+Modules. It's really easy to split the responsibilities, add rules, even
+have multiple different label printers, perhaps for different shops.
+* In a very non-Rubyist approach, I've done no testing what-so-ever :(

ruby/marcheiligers/prices.rb

@@ -19,9 +19,6 @@ def initialize(supplier_id, product_code, description, delivery_date, cost_price
     @delivery_date = Date.parse delivery_date
     @cost_price = cost_price.to_i
     @unit_count = unit_count.to_i
-
-    @markup = 0.5
-    @shelf_life = 7
   end
 
   def selling_price
@@ -104,9 +101,9 @@ def apply!(product)
 end
 
 class FruitRule < Rule
-  product_codes 1100, 1199
-  markup 0.4
-  shelf_life 14
+  product_codes 1000, 1999
+  markup 0.5
+  shelf_life 7
 end
 
 class AppleRule < Rule
@@ -126,7 +123,7 @@ class BerryRule < Rule
   markup 0.55
 end
 
-class SupplierRule
+class SupplierRule < Rule
   def self.for_suppliers(*ids)
     suppliers.concat ids
     self