Adds mixing bowls

code/datums/recipe.dm

@@ -53,15 +53,28 @@
 		return -1
 	return .
 
-/datum/recipe/proc/check_items(obj/container) //1=precisely, 0=insufficiently, -1=superfluous
+/datum/recipe/proc/check_items(obj/container, list/ignored_items = null) //1=precisely, 0=insufficiently, -1=superfluous
 	if(!items)
 		if(locate(/obj/) in container)
-			return -1
-		else
+			if(ignored_items)	//are we supposed to be ignoring anything?
+				var/unignored = FALSE
+				for(var/obj/O in container)
+					if(!is_type_in_list(O, ignored_items))
+						unignored = TRUE	//found something we aren't ignoring, quit looking
+						break
+				if(unignored)
+					return -1
+				else	//anything we found is something we are ignoring
+					return 1
+			else	//not ignoring anything, and we found something
+				return -1
+		else	//didn't find anything
 			return 1
 	. = 1
 	var/list/checklist = items.Copy()
 	for(var/obj/O in container)
+		if(ignored_items && is_type_in_list(O, ignored_items))	//skip if this is something we are ignoring
+			continue
 		var/found = 0
 		for(var/type in checklist)
 			if(istype(O,type))
@@ -95,12 +108,12 @@
 	container.reagents.clear_reagents()
 	return result_obj
 
-/proc/select_recipe(list/datum/recipe/available_recipes, obj/obj, exact = 1 as num)
+/proc/select_recipe(list/datum/recipe/available_recipes, obj/obj, exact = 1 as num, list/ignored_items = null)
 	if(!exact)
 		exact = -1
 	var/list/datum/recipe/possible_recipes = new
 	for(var/datum/recipe/recipe in available_recipes)
-		if(recipe.check_reagents(obj.reagents) == exact && recipe.check_items(obj) == exact)
+		if(recipe.check_reagents(obj.reagents) == exact && recipe.check_items(obj, ignored_items) == exact)
 			possible_recipes += recipe
 	if(possible_recipes.len == 0)
 		return null