lib/pallets/graph.rb in pallets-0.2.0 vs lib/pallets/graph.rb in pallets-0.3.0

@@ -14,9 +14,13 @@
 
     def parents(node)
       @nodes[node]
     end
 
+    def empty?
+      @nodes.empty?
+    end
+
     # Returns nodes topologically sorted, together with their order (number of
     # nodes that have to be executed prior)
     def sorted_with_order
       # Identify groups of nodes that can be executed concurrently
       groups = tsort_each.slice_when { |a, b| parents(a) != parents(b) }