graph: add graphviz script

graph.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+
+import json
+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')
+
+    recipes = dict()
+
+    for dirname, dirs, files in os.walk(recipe_root):
+        for f in files:
+            path = os.path.join(dirname, f)
+            name, _ = os.path.splitext(f)
+            with open(path, 'r') as src:
+                variations = json.load(src)
+
+            recipes[name] = variations
+
+    as_graphviz(recipes)