graph: add some minimal documentation

graph.py

@@ -1,5 +1,10 @@
 #!/usr/bin/env python3
 
+"""
+This script takes a target item and produces GraphViz formatted output that
+describes the gross production dependencies required to produce the item.
+"""
+
 import satisfactory
 
 import os
@@ -8,6 +13,14 @@ from typing import Iterable
 
 
 def graph(cookbook: satisfactory.Cookbook, targets: Iterable[str]):
+    """
+    Output the directed graph representing the production chain needed to
+    produce all the provided targets.
+
+    :param cookbook:
+    :param targets:
+    :return:
+    """
     print("digraph G {")
 
     seen = set()
@@ -22,17 +35,10 @@ def graph(cookbook: satisfactory.Cookbook, targets: Iterable[str]):
                 remain.add(need)
 
         seen.add(output)
+
     print("}")
 
 
-def graph_all(recipes: dict) -> None:
-    graph(recipes, recipes.all())
-
-
-def graph_one(recipes: dict, target: str) -> None:
-    graph(recipes, [target])
-
-
 if __name__ == '__main__':
     def main():
         import argparse