required: add world resource query

required.py

@@ -5,15 +5,6 @@ import typing
 import os
 
 
-def as_graphviz(recipes: dict):
-    print("digraph G {")
-    for result, method in recipes.items():
-        for variation in method:
-            for input in variation["input"]:
-                print(f"{input} -> {result}")
-    print("}")
-
-
 if __name__ == '__main__':
     root = os.path.dirname(__file__)
     recipe_root = os.path.join(root, 'data', 'recipes')
@@ -29,4 +20,12 @@ if __name__ == '__main__':
 
             recipes[name] = variations
 
-    as_graphviz(recipes)
+
+    resources = set()
+
+    for output, variations in recipes.items():
+        for option in variations:
+            if len(option['input']) == 0:
+                resources.add(output)
+
+    print("Resources:", resources)