Integrate into vanilla

util.lua

@@ -0,0 +1,86 @@
+local util = {}
+
+-- Add a prerequisite to a given technology
+function util.add_prerequisite(technology_name, prerequisite)
+  technology = data.raw.technology[technology_name]
+	table.insert(technology.prerequisites, prerequisite)
+end
+
+-- Add a given quantity of ingredient to a given recipe
+function util.add_ingredient(recipe_name, ingredient, quantity)
+  add_ingredient(data.raw.recipe[recipe_name], ingredient, quantity)
+  add_ingredient(data.raw.recipe[recipe_name].normal, ingredient, quantity)
+  add_ingredient(data.raw.recipe[recipe_name].expensive, ingredient, quantity)
+end
+
+function add_ingredient(recipe, ingredient, quantity)
+  if recipe ~= nil and recipe.ingredients ~= nil then
+    table.insert(recipe.ingredients, {ingredient, quantity})
+  end
+end
+
+-- Replace one ingredien with another in a recipe
+function util.replace_ingredient(recipe_name, old, new)
+   replace_ingredient(data.raw.recipe[recipe_name], old, new)
+   replace_ingredient(data.raw.recipe[recipe_name].normal, old, new)
+   replace_ingredient(data.raw.recipe[recipe_name].expensive, old, new)
+end
+
+function replace_ingredient(recipe, old, new)
+	if recipe ~= nil and recipe.ingredients ~= nil then
+		for i, ingredient in pairs(recipe.ingredients) do 
+			-- For final fixes
+			if ingredient.name == old then ingredient.name = new end
+			-- For updates
+			if ingredient[1] == old then ingredient[1] = new end
+		end
+	end
+end
+
+-- Remove an ingredient from a recipe
+function util.remove_ingredient(recipe_name, old)
+  remove_ingredient(data.raw.recipe[recipe_name], old)
+  remove_ingredient(data.raw.recipe[recipe_name].normal, old)
+  remove_ingredient(data.raw.recipe[recipe_name].expensive, old)
+end
+
+function remove_ingredient(recipe, old)
+  index = -1
+	if recipe ~= nil and recipe.ingredients ~= nil then
+		for i, ingredient in pairs(recipe.ingredients) do 
+      if ingredient.name == old or ingredient[1] == old then
+        index = i
+        break
+      end
+    end
+    if index > -1 then
+      table.remove(recipe.ingredients, index)
+    end
+  end
+end
+
+
+-- Replace an amount of an ingredient in a recipe. Keep at least 1 of old.
+function util.replace_some_ingredient(recipe_name, old, new, amount)
+  replace_some_ingredient(data.raw.recipe[recipe_name], old, new, amount)
+  replace_some_ingredient(data.raw.recipe[recipe_name].normal, old, new, amount)
+  replace_some_ingredient(data.raw.recipe[recipe_name].expensive, old, new, amount)
+end
+
+function replace_some_ingredient(recipe, old, new, amount)
+	if recipe ~= nil and recipe.ingredients ~= nil then
+		for i, ingredient in pairs(recipe.ingredients) do 
+			-- For final fixes
+			if ingredient.name == old then
+        ingredient.amount = math.max(1, ingredient.amount - amount)
+      end
+			-- For updates
+			if ingredient[1] == old then
+        ingredient[2] = math.max(1, ingredient[2] - amount)
+      end
+		end
+    add_ingredient(recipe, new, amount)
+	end
+end
+
+return util