plan: move the primary functionality into a function

This prevents reliance on global variables

plan.py

@@ -37,14 +37,14 @@ def calculate_rates(recipes, remain):
     return required_items
 
 
-def basic_rate(recipes, name: str):
-    return fractions.Fraction(
-        target_recipe['output'][target_name],
-        target_recipe['crafting_time']
-    )
+def basic_rate(recipe):
+    for output, count in recipe['output'].items():
+        return fractions.Fraction(
+            count, recipe['crafting_time']
+        )
 
 
-if __name__ == '__main__':
+def main():
     recipes = satisfactory.Cookbook('data/recipes')
 
     required_items = collections.defaultdict(fractions.Fraction)
@@ -56,7 +56,7 @@ if __name__ == '__main__':
     target = recipes[target_name]
     target_recipe = target['recipes'][0]
 
-    remain = [{n: basic_rate(recipes, n) for n in targets}]
+    remain = [{n: basic_rate(recipes[n]['recipes'][0]) for n in targets}]
     required_items = calculate_rates(recipes, remain)
 
     for name, rate in required_items.items():
@@ -92,3 +92,7 @@ if __name__ == '__main__':
 
     print(required_power)
     print(math.ceil(required_power / 150), "fuel generators")
+
+
+if __name__ == '__main__':
+    main()