Improve handling of pass-through items in recipes

src/client/models/crafting/crafting_plan.coffee

@@ -24,6 +24,7 @@ module.exports = class CraftingPlan
         @_rawScores = {}
         @_scores    = {}
         @_steps     = steps
+        @_tools     = null
         @_want      = want
 
         @_numberSteps()
@@ -37,19 +38,27 @@ module.exports = class CraftingPlan
         @_made = new SimpleInventory modPack:@_modPack
         @_made.addInventory @_have
 
+        @_tools = new SimpleInventory modPack:@_modPack
+
         for i in [@_steps.length-1..0] by -1
             step = @_steps[i]
             step.multiplier = 0
+            recipe = step.recipe
 
             for stack in step.recipe.output
-                if not stack?
-                    throw new Error 'stack should not be null here'
-
                 qualifiedSlug = @_modPack.qualifySlug stack.itemSlug
+
+                if recipe.isPassThroughFor stack.itemSlug
+                    continue if @_need.hasAtLeast qualifiedSlug, 1
+                    continue if @_tools.hasAtLeast qualifiedSlug, 1
+                    @_need.add qualifiedSlug, 1
+                    @_tools.add qualifiedSlug, 1
+                else
                     while @_need.quantityOf(qualifiedSlug) > 0
                         @_executeStep step
 
         @_made.addInventory @_want
+        @_made.addInventory @_tools
         @_pruneEmptySteps()
         @_numberSteps()
 

src/client/models/crafting/crafting_plan.test.coffee

@@ -63,6 +63,22 @@ describe 'crafting_plan.coffee', ->
             '1x 8 test__iron_ore,test__coal>.0. ... .1.>test__furnace>8 test__iron_ingot'
         ]
 
+    it 'uses the correct amount of passthrough items', ->
+        plans = fixtures.makePlans [10, 'test__split_oak_wood'], [10, 'test__split_spruce_wood']
+        plan = plans[2]
+        plan.computeRequired()
+
+        plan.need.unparse().should.equal 'coal:8.iron_ore:6.oak_wood:5.spruce_wood'
+        plan.made.unparse().should.equal '4.iron_ingot:maul:2.oak_planks:10.split_oak_wood:10.split_spruce_wood:stick'
+        (s.toString() for s in plan.steps).should.eql [
+            '1x test__oak_wood>... .0. ...>>4 test__oak_planks'
+            '1x test__oak_planks>.0. .0. ...>>4 test__stick'
+            '1x 8 test__iron_ore,test__coal>.0. ... .1.>test__furnace>8 test__iron_ingot'
+            '1x test__iron_ingot,test__stick>001 001 ..1>test__crafting_table>test__maul'
+            '5x test__spruce_wood,test__maul>.1. .0. ...>>2 test__split_spruce_wood,test__maul'
+            '5x test__oak_wood,test__maul>.1. .0. ...>>2 test__split_oak_wood,test__maul'
+        ]
+
     it 'can compute multiple items with multiple plans', ->
         plans = fixtures.makePlans [1, 'test__copper_block'], [1, 'test__iron_sword']
         plans.length.should.equal 4

src/client/models/crafting/crafting_step.coffee

@@ -67,4 +67,6 @@ module.exports = class CraftingStep
         @_inventory = new SimpleInventory
         for stack in @_recipe.input
             qualifiedSlug = @_modPack.qualifySlug stack.itemSlug
-            @_inventory.add qualifiedSlug, @multiplier * @_recipe.getQuantityRequired stack.itemSlug
+            required = @_recipe.getQuantityRequired(stack.itemSlug) - @_recipe.getQuantityProduced(stack.itemSlug)
+            required = if required > 0 then required * @multiplier else 1
+            @_inventory.add qualifiedSlug, required

src/client/models/crafting/fixtures.test.coffee

@@ -98,6 +98,12 @@ MOD_VERSION_FILE =
             input: Stick, Cobblestone
             pattern: .0. .1. ...
 
+    item: Maul
+        recipe:
+            input: Iron Ingot, Stick
+            pattern: 001 001 ..1
+            tools: Crafting Table
+
     item: Oak Planks
         recipe:
             input: Oak Wood
@@ -107,12 +113,29 @@ MOD_VERSION_FILE =
     item: Oak Wood
         gatherable: yes
 
+    item: Spruce Wood
+        gatherable: yes
+
     item: Stick
         recipe:
             input: Oak Planks
             pattern: .0. .0. ...
             quantity: 4
 
+    item: Split Oak Wood
+        recipe:
+            extras: Maul
+            input: Oak Wood, Maul
+            pattern: .1. .0. ...
+            quantity: 2
+
+    item: Split Spruce Wood
+        recipe:
+            extras: Maul
+            input: Spruce Wood, Maul
+            pattern: .1. .0. ...
+            quantity: 2
+
     item: String
         gatherable: yes
 

src/client/models/game/recipe.coffee

@@ -111,16 +111,7 @@ module.exports = class Recipe extends BaseModel
         return result
 
     isPassThroughFor: (itemSlug)->
-        amountCreated = 0
-        for stack in @output
-            if stack.itemSlug.matches itemSlug
-                amountCreated += stack.quantity
-
-        for stack in @input
-            if stack.itemSlug.matches itemSlug
-                amountCreated -= stack.quantity
-
-        return amountCreated <= 0
+        return @getQuantityProduced(itemSlug) is @getQuantityRequired(itemSlug)
 
     produces: (itemSlug)->
         if not @_produces?