Implement `template' task keyword

lib/producer/core/task.rb

@@ -57,6 +57,25 @@ module Producer
       def get(key)
         @env[key]
       end
+
+      def template(path, variables = {})
+        path = "#{path}.erb"
+        tpl = ERB.new(File.read(path), nil, '-')
+        tpl.filename = path
+        tpl.result build_erb_binding variables
+      end
+
+
+      private
+
+      def build_erb_binding(variables)
+        Object.new.instance_eval do |o|
+          variables.each do |k, v|
+            o.instance_variable_set "@#{k}", v
+          end
+          binding
+        end
+      end
     end
   end
 end