Actually add ArrayProperty

lib/cheffish/array_property.rb

@@ -0,0 +1,29 @@
+require 'chef_compat/property'
+
+module Cheffish
+  # A typical array property. Defaults to [], accepts multiple args to setter, accumulates values.
+  class ArrayProperty < ChefCompat::Property
+    def initialize(**options)
+      options[:is] ||= Array
+      options[:default] ||= []
+      options[:coerce] ||= proc { |v| v.is_a?(Array) ? v : [ v ] }
+      super
+    end
+
+    # Support my_property 'a', 'b', 'c'; my_property 'a'; and my_property ['a', 'b']
+    def emit_dsl
+      declared_in.class_eval(<<-EOM, __FILE__, __LINE__+1)
+        def #{name}(*values)
+          property = self.class.properties[#{name.inspect}]
+          if values.empty?
+            property.get(self)
+          elsif property.is_set?(self)
+            property.set(self, property.get(self) + values.flatten)
+          else
+            property.set(self, values.flatten)
+          end
+        end
+      EOM
+    end
+  end
+end