Add CraftingPlan to compute resource requirements

src/coffee/controllers/full_recipe_controller.coffee

@@ -71,7 +71,7 @@ module.exports = class FullRecipeController extends BaseController
         inputs.clear()
 
         if @model?
-            @model.eachInputStack (stack)->
+            for stack in @model.input
                 inputs.add stack.itemSlug, stack.quantity
 
 

src/coffee/models/crafting/crafting_node.coffee

@@ -32,13 +32,13 @@ module.exports = class CraftingNode
     # Public Methods ###############################################################################
 
     expand: (queue=[])->
+        return unless @valid
         return queue if @children.length > 0
 
         for child in @_createChildren()
             child.parent = this
-            if child.valid
-                @_children.push child
-                queue.push child
+            @_children.push child
+            queue.push child
         return queue
 
     acceptVisitor: (visitor)->
@@ -65,52 +65,46 @@ module.exports = class CraftingNode
 
     # Property Methods #############################################################################
 
-    getChildren: ->
-        return @_children
-
-    isComplete: ->
-        if not @_complete?
-            @_complete = @_checkCompleteness()
-        return @_complete
-
-    getCompleteText: ->
-        return if @complete then "✓" else "✗"
-
-    getDepth: ->
-        maxDepth = 1
-        for child in @children
-            maxDepth = Math.max maxDepth, child.getDepth() + 1
-        return maxDepth
-
-    getId: ->
-        return @_id
-
-    getRotations: ->
-        return @_rotations
-
-    getSize: ->
-        size = 1
-        for child in @children
-            size += child.size
-        return size
-
-    isValid: ->
-        return @_valid if @_valid?
-
-        valid = @_checkValidity()
-        @_valid = false if not valid
-
-        return valid
-
     Object.defineProperties @prototype,
-        children:     { get:@prototype.getChildren     }
-        complete:     { get:@prototype.isComplete      }
-        completeText: { get:@prototype.getCompleteText }
-        depth:        { get:@prototype.getDepth        }
-        id:           { get:@prototype.getId           }
-        rotations:    { get:@prototype.getRotations    }
-        size:         { get:@prototype.getSize         }
-        valid:        { get:@prototype.isValid         }
+
+        children:
+            get: -> return @_children
+
+        complete:
+            get: ->
+                if not @_complete?
+                    @_complete = @_checkCompleteness()
+                return @_complete
+
+        completeText:
+            get: -> if @complete then "◼︎" else "◻︎"
+
+        depth:
+            get: ->
+                maxDepth = 1
+                for child in @children
+                    maxDepth = Math.max maxDepth, child.depth + 1
+                return maxDepth
+
+        id:
+            get: -> return @_id
+
+        rotations:
+            get: -> return @_rotations
+
+        size:
+            get: ->
+                size = 1
+                for child in @children
+                    size += child.size
+                return size
+
+        valid:
+            get: -> @_checkValidity()
+
+        validText:
+            get: -> if @valid then "✓" else "✗"
+
 
     # Virtual Methods ##############################################################################
 

src/coffee/models/crafting/crafting_plan.coffee

@@ -39,12 +39,24 @@ module.exports = class CraftingPlan
     # Object Overrides #############################################################################
 
     toString: ->
-        return "#{@constructor.name}{
-            wanted:#{@wanted},
-            required:#{@required},
-            steps:[#{(step.toString() for step in @steps).join(',')}],
-            produced:#{@produced}
-            }"
+        result = ["To Make:"]
+        @_wanted.each (stack)->
+            result.push "    #{stack}"
+
+        result.push "Start with:"
+        @_required.each (stack)->
+            result.push "    #{stack}"
+
+        result.push "Use these recipes:"
+        for step in @_steps
+            result.push "    #{step}"
+
+        result.push "To produce:"
+        @_produced.each (stack)->
+            result.push "    #{stack}"
+
+        return result.join '\n'
+
 
     # Private Methods ##############################################################################
 
@@ -52,35 +64,32 @@ module.exports = class CraftingPlan
         @_required.addInventory @_wanted
 
         for i in [@_steps.length-1..0] by -1
-            recipe = @_steps[i]
+            step = @_steps[i]
 
-            for stack in recipe.output
+            for stack in step.recipe.output
                 while @_required.quantityOf(stack.itemSlug) > 0
-                    @_executeRecipe recipe
+                    @_executeStep step
 
         @_produced.addInventory @_wanted
 
-    _executeRecipe: (recipe)->
-        #console.log "executing: #{recipe}"
+    _executeStep: (step)->
+        step.repeat += 1
+        recipe = step.recipe
+
         for stack in recipe.input
-            @_use stack
+            available = @_produced.quantityOf stack.itemSlug
+            required  = recipe.getQuantityRequired stack.itemSlug
+            consumed  = Math.min required, available
+            deficit   = required - consumed
+
+            @_produced.remove stack.itemSlug, consumed
+            @_required.add stack.itemSlug, deficit
+
         for stack in recipe.output
-            @_produce stack
+            deficit     = @_required.quantityOf stack.itemSlug
+            created     = recipe.getQuantityProduced stack.itemSlug
+            replenished = Math.min deficit, created
+            surplus     = created - replenished
 
-    _produce: (stack)->
-        deficit     = @_required.quantityOf stack.itemSlug
-        replenished = Math.min deficit, stack.quantity
-        surplus     = stack.quantity - replenished
-
-        #console.log "producing #{stack.itemSlug}, surplus: #{surplus}, replenished:#{replenished}"
-        @_produced.add stack.itemSlug, surplus
-        @_required.remove stack.itemSlug, replenished
-
-    _use: (stack)->
-        available = @_produced.quantityOf stack.itemSlug
-        consumed  = Math.min stack.quantity, available
-        deficit   = stack.quantity - consumed
-
-        #console.log "using #{stack.itemSlug}, consumed: #{consumed}, deficit:#{deficit}"
-        @_produced.remove stack.itemSlug, consumed
-        @_required.add stack.itemSlug, deficit
+            @_produced.add stack.itemSlug, surplus
+            @_required.remove stack.itemSlug, replenished

src/coffee/models/crafting/crafting_step.coffee

@@ -0,0 +1,29 @@
+###
+Crafting Guide - crafting_step.coffee
+
+Copyright (c) 2015 by Redwood Labs
+All rights reserved.
+###
+
+########################################################################################################################
+
+module.exports = class CraftingStep
+
+    constructor: (recipe, repeat=0)->
+        if not recipe? then throw new Error 'recipe is required'
+        if repeat < 0 then throw new Error 'repeat must be at least 1'
+
+        @_recipe = recipe
+        @repeat = repeat
+
+    # Property Methods #############################################################################
+
+    Object.defineProperties @prototype,
+
+        recipe:
+            get: -> @_recipe
+
+    # Object Overrides #############################################################################
+
+    toString: ->
+        return "#{@repeat}x #{@recipe.slug}"

src/coffee/models/crafting/graph_builder.coffee

@@ -44,26 +44,23 @@ module.exports = class GraphBuilder
 
     # Property Methods #############################################################################
 
-    isComplete: ->
-        return false unless @_rootNode?
-        return false unless @_queue?
-        return false unless @_queue.length is 0
-        return true
-
-    getRootNode: ->
-        return @_rootNode
-
-    getStepCount: ->
-        return @_stepCount
-
-    getWanted: ->
-        return @_wanted
-
     Object.defineProperties @prototype,
-        complete:  { get:@prototype.isComplete   }
-        rootNode:  { get:@prototype.getRootNode  }
-        stepCount: { get:@prototype.getStepCount }
-        wanted:    { get:@prototype.getWanted    }
+
+        complete:
+            get: ->
+                return false unless @_rootNode?
+                return false unless @_queue?
+                return false unless @_queue.length is 0
+                return true
+
+        rootNode:
+            get: -> @_rootNode
+
+        stepCount:
+            get: -> @_stepCount
+
+        wanted:
+            get: -> @_wanted
 
     # Object Overrides ############################################################################
 

src/coffee/models/crafting/inventory_node.coffee

@@ -33,12 +33,12 @@ module.exports = class InventoryNode extends CraftingNode
 
     _checkCompleteness: ->
         for child in @children
-            return false unless child.isComplete
+            return false unless child.complete
         return true
 
     _checkValidity: ->
         for child in @children
-            return false unless child.isValid
+            return false unless child.valid
         return true
 
     # Object Overrides #############################################################################
@@ -47,8 +47,7 @@ module.exports = class InventoryNode extends CraftingNode
         options.indent ?= ''
         options.recursive ?= true
 
-        completeText = if @complete then 'complete' else 'incomplete'
-        parts = ["#{options.indent}#{@completeText} InventoryNode for #{@inventory}"]
+        parts = ["#{options.indent}#{@completeText} #{@validText} InventoryNode for #{@inventory}"]
         nextIndent = options.indent + '    '
         if options.recursive
             for child in @children

src/coffee/models/crafting/item_node.coffee

@@ -46,7 +46,10 @@ module.exports = class ItemNode extends CraftingNode
         return [] unless recipes.length > 0
 
         for recipe in recipes
-            result.push new RecipeNode modPack:@modPack, recipe:recipe
+            child = new RecipeNode modPack:@modPack, recipe:recipe
+            child.parent = this
+            if child.valid
+                result.push child
 
         return result
 
@@ -55,13 +58,13 @@ module.exports = class ItemNode extends CraftingNode
         return false unless @children?
 
         for child in @children
-            return true if child.isComplete
+            return true if child.complete
         return false
 
     _checkValidity: ->
         return true unless @children.length > 0
         for child in @children
-            return true if child.isValid
+            return true if child.valid
         return false
 
     # Object Overrides #############################################################################
@@ -70,8 +73,7 @@ module.exports = class ItemNode extends CraftingNode
         options.indent ?= ''
         options.recursive ?= true
 
-        completeText = if @complete then 'complete' else 'incomplete'
-        parts = ["#{options.indent}#{@completeText} ItemNode for #{@item.name}"]
+        parts = ["#{options.indent}#{@completeText} #{@validText} ItemNode for #{@item.name}"]
         nextIndent = options.indent + '    '
         if options.recursive
             for child in @children

src/coffee/models/crafting/plan_builder.coffee

@@ -7,6 +7,7 @@ All rights reserved.
 
 CraftingNode = require './crafting_node'
 CraftingPlan = require './crafting_plan'
+CraftingStep = require './crafting_step'
 Inventory    = require '../inventory'
 
 ########################################################################################################################
@@ -30,37 +31,34 @@ module.exports = class PlanBuilder
     producePlans: (maxPlans=null)->
         maxPlans = if maxPlans then @plans.length + maxPlans else Number.MAX_VALUE
 
-        while @plans.length is 0 or (@plans.length < maxPlans and not @complete)
+        while not @complete and (@plans.length < maxPlans)
             plan = @_captureCurrentPlan()
-            @plans.push plan
+            if plan?
+                @plans.push plan
+
             @_incrementChoiceNodes()
 
         return @_plans
 
     # Property Methods #############################################################################
 
-    isComplete: ->
-        return @_complete
-
-    getPlans: ->
-        return @_plans
-
-    getWanted: ->
-        return @_wanted
-
-    setWanted: (wanted)->
-        @_wanted = wanted or new Inventory
-
     Object.defineProperties @prototype,
-        complete: { get:@prototype.isComplete }
-        plans:    { get:@prototype.getPlans }
-        wanted:   { get:@prototype.getWanted, set:@prototype.setWanted }
+
+        complete:
+            get: -> @_complete
+
+        plans:
+            get: -> @_plans
+
+        wanted:
+            get: -> @_wanted
+            set: (wanted)-> @_wanted = wanted or new Inventory
 
     # Private Methods ##############################################################################
 
     _captureCurrentPlan: ->
         toVisit = [@_rootNode]
-        steps = []
+        stepNodes = []
 
         while toVisit.length > 0
             node = toVisit.shift()
@@ -70,14 +68,31 @@ module.exports = class PlanBuilder
             else if node.TYPE is CraftingNode::TYPES.ITEM
                 toVisit.push node.children[0] if node.children.length > 0
             else if node.TYPE is CraftingNode::TYPES.RECIPE
-                steps.push node.recipe
+                stepNodes.push node
                 toVisit.push(c) for c in node.children
 
-        steps.reverse()
+        steps = []
+        seenRecipes = {}
+        index = stepNodes.length - 1
+        while index >= 0
+            node = stepNodes[index]
+            index -= 1
+            return null unless node.valid and node.complete
+
+            recipeSlug = node.recipe.slug
+            continue if seenRecipes[recipeSlug]?
+
+            seenRecipes[recipeSlug] = true
+            steps.push new CraftingStep node.recipe
+
         plan = new CraftingPlan steps, @_wanted
         return plan
 
     _incrementChoiceNodes: ->
+        if @_choiceNodes.length is 0
+            @_complete = true
+            return
+
         index = @_choiceNodes.length - 1
         while true
             if index is -1

src/coffee/models/crafting/recipe_node.coffee

@@ -34,14 +34,15 @@ module.exports = class RecipeNode extends CraftingNode
 
     _checkCompleteness: ->
         for child in @children
-            return false unless child.isComplete
+            return false unless child.complete
         return true
 
     _checkValidity: ->
-        for child in @children
-            return false unless child.isValid
-
         return false if @_isRepeatedRecipe()
+
+        for child in @children
+            return false unless child.valid
+
         return true
 
     # Private Methods ##############################################################################
@@ -60,8 +61,7 @@ module.exports = class RecipeNode extends CraftingNode
         options.indent ?= ''
         options.recursive ?= true
 
-        completeText = if @complete then 'complete' else 'incomplete'
-        parts = ["#{options.indent}#{@completeText} RecipeNode for #{@recipe.slug}"]
+        parts = ["#{options.indent}#{@completeText} #{@validText} RecipeNode for #{@recipe.slug}"]
         nextIndent = options.indent + '    '
         if options.recursive
             for child in @children

src/coffee/models/crafting_plan.coffee

@@ -1,233 +0,0 @@
-###
-Crafting Guide - crafting_plan.coffee
-
-Copyright (c) 2014-2015 by Redwood Labs
-All rights reserved.
-###
-
-BaseModel = require './base_model'
-Inventory = require './inventory'
-ItemSlug  = require './item_slug'
-Step      = require './step'
-_         = require 'underscore'
-{Event}   = require '../constants'
-
-########################################################################################################################
-
-module.exports = class CraftingPlan extends BaseModel
-
-    constructor: (attributes={}, options={})->
-        if not attributes.modPack then throw new Error 'modPack is required'
-        attributes.includingTools ?= false
-        super attributes, options
-
-        @have   = new Inventory modPack:@modPack
-        @want   = new Inventory modPack:@modPack
-        @need   = new Inventory modPack:@modPack
-        @result = new Inventory modPack:@modPack
-
-        recraft = _.debounce (=> @craft()), 100
-        for inventory in [@have, @want]
-            inventory.on Event.change, recraft
-
-        @on Event.change + ':includingTools', recraft
-
-        @clear()
-
-    # Public Methods ###############################################################################
-
-    clear: (options={})->
-        @steps = []
-        @need.clear()
-        @result.clear()
-
-        @trigger 'change', this
-        return this
-
-    craft: ->
-        toolsMessage = if @includingTools then ' (including tools)' else ''
-        haveMessage = if @have.isEmpty then '' else " starting with #{@have.unparse()}"
-        logger.info => "crafting #{@want.unparse()}#{toolsMessage}#{haveMessage}"
-
-        @clear()
-        @have.localize()
-        @want.localize()
-
-        @result.addInventory @have
-
-        @steps = {}
-        @want.each (stack)=>
-            @_findSteps stack.itemSlug, {}, ignoreGatherable:true
-            item = @modPack.findItem stack.itemSlug
-            @need.add item.slug, stack.quantity
-
-        @steps = (step for recipeSlug, step of @steps)
-        @_resolveNeeds()
-        @_removeExtraSteps()
-
-        @result.addInventory @want
-
-        @need.trigger 'change', @need
-        @result.trigger 'change', @result
-        @trigger 'change', this
-
-    removeUncraftableItems: ->
-        toRemove = []
-        @want.each (stack)=>
-            item = @modPack.findItem stack.itemSlug
-            if not item? then toRemove.push stack.itemSlug
-
-        for itemSlug in toRemove
-            @want.remove itemSlug
-
-    # Event Methods ################################################################################
-
-    onIncludingToolsChanged: ->
-        @storage.setItem 'includingTools', "#{@includingTools}"
-        @craft()
-
-    # Object Overrides #############################################################################
-
-    toString: ->
-        return "#{@constructor.name} {
-                have:#{@have},
-                want:#{@want},
-                need:#{@need},
-                result:#{@result},
-                steps:#{@steps}
-            }"
-
-    # Private Methods ##############################################################################
-
-    _findRecipes: (item)->
-        recipes = @modPack.findRecipes item.slug
-        return null unless recipes? and recipes.length > 0
-
-        recipeOptions = []
-        for recipe in recipes
-            if recipe.tools.length is 0
-                recipeOptions.push recipe:recipe, missingTools:0
-            else
-                missingTools = []
-                for tool in recipe.tools
-                    if not @have.hasAtLeast tool.itemSlug
-                        missingTools.push tool
-                recipeOptions.push recipe:recipe, missingTools:missingTools.length
-
-        recipeOptions.sort (a, b)->
-            return 0 if a.missingTools is b.missingTools
-            return if a.missingTools < b.missingTools then -1 else +1
-
-        return (option.recipe for option in recipeOptions)
-
-    _findSteps: (itemSlug, parentSteps={})->
-        item = @modPack.findItem itemSlug
-        return unless item?
-        return unless item.isCraftable
-
-        ignoreGatherable = @want.hasAtLeast itemSlug, 1
-        if (not item.isGatherable) or ignoreGatherable
-            recipes = @_findRecipes item
-            recipes ?= []
-
-            if parentSteps[item.slug]?
-                logger.verbose -> "found cycle at #{item.slug}"
-                throw new Error 'invalid recipe path'
-            parentSteps[item.slug] = item
-
-            logger.verbose -> "exploring: #{item.slug}"
-            logger.indent()
-
-            currentSteps = _.clone @steps
-            foundValidRecipe = false
-            for i in [0...recipes.length] by 1
-                recipe = recipes[i]
-                logger.verbose -> "trying recipe #{i+1} of #{recipes.length}: #{recipe.slug}"
-                if @steps[recipe.slug]?
-                    logger.verbose -> "already accepted this recipe"
-                    foundValidRecipe = true
-                    break
-
-                try
-                    if @includingTools
-                        for toolStack in recipe.tools
-                            if not @_hasStep toolStack.itemSlug
-                                @_findSteps toolStack.itemSlug, parentSteps
-
-                    for inputStack in recipe.input
-                        @_findSteps inputStack.itemSlug, parentSteps
-
-                    logger.verbose -> "adding step for: #{recipe.slug}"
-                    @steps[recipe.slug] = new Step outputItemSlug:item.slug, recipe:recipe
-                    foundValidRecipe = true
-                    break
-                catch error
-                    logger.verbose -> "recipe didn't work out: #{recipe.slug}"
-                    if error.message isnt 'invalid recipe path' then throw error
-                    @steps = _.clone currentSteps
-
-            delete parentSteps[item.slug]
-            logger.outdent()
-
-        if not (foundValidRecipe or item.isGatherable)
-            logger.verbose -> "could not find a valid recipe for #{item.slug}"
-            throw new Error 'invalid recipe path'
-
-    _hasStep: (itemSlug)->
-        for recipeSlug, step of @steps
-            return true if step.recipe.produces itemSlug
-        return false
-
-    _qualifyItemSlug: (itemSlug)->
-        item = @modPack.findItem itemSlug
-        return item.slug if item?
-        return itemSlug
-
-    _removeExtraSteps: ->
-        result = []
-
-        number = 1
-        for step in @steps
-            if step.multiplier > 0
-                result.push step
-                step.number = number
-                number += 1
-
-        @steps = result
-
-    _resolveNeeds: ->
-        for i in [@steps.length-1..0] by -1
-            step   = @steps[i]
-            step.number = i + 1
-
-            recipe = step.recipe
-            outputQuantity = recipe.getQuantityProducedOf step.outputItemSlug
-
-            step.multiplier = Math.ceil(@need.quantityOf(step.outputItemSlug) / outputQuantity)
-
-            if @includingTools
-                recipe.eachToolStack (stack)=>
-                    itemSlug  = @_qualifyItemSlug stack.itemSlug
-                    available = @result.quantityOf(itemSlug) + @need.quantityOf(itemSlug)
-                    needed    = Math.max 0, stack.quantity - available
-
-                    @need.add itemSlug, needed
-                    @result.add itemSlug, needed
-
-            recipe.eachInputStack (stack)=>
-                itemSlug  = @_qualifyItemSlug stack.itemSlug
-                needed    = step.multiplier * stack.quantity
-                consumed  = Math.min needed, @result.quantityOf itemSlug
-                remaining = needed - consumed
-
-                @result.remove itemSlug, consumed
-                @need.add itemSlug, remaining
-
-            recipe.eachOutputStack (stack)=>
-                itemSlug  = @_qualifyItemSlug stack.itemSlug
-                created   = stack.quantity * step.multiplier
-                consumed  = Math.min created, @need.quantityOf itemSlug
-                remaining = created - consumed
-
-                @result.add itemSlug, remaining
-                @need.remove itemSlug, consumed

src/coffee/models/recipe.coffee

@@ -6,6 +6,7 @@ All rights reserved.
 ###
 
 BaseModel       = require './base_model'
+ItemSlug        = require './item_slug'
 Stack           = require './stack'
 {Event}         = require '../constants'
 {StringBuilder} = require 'crafting-guide-common'
@@ -46,50 +47,15 @@ module.exports = class Recipe extends BaseModel
                 return -1 if aValue
                 return +1 if bValue
 
-            aValue = a.getQuantityProducedOf itemSlug
-            bValue = b.getQuantityProducedOf itemSlug
+            aValue = a.getQuantityProduced itemSlug
+            bValue = b.getQuantityProduced itemSlug
             if aValue isnt bValue
                 return if aValue > bValue then -1 else +1
 
-        aValue = a.getOutputCount()
-        bValue = b.getOutputCount()
-        if aValue isnt bValue
-            return if aValue > bValue then -1 else +1
-
-        aValue = a.tools.length
-        bValue = b.tools.length
-        if aValue isnt bValue
-            return if aValue < bValue then -1 else +1
-
-        aValue = a.getInputCount()
-        bValue = b.getInputCount()
-        if aValue isnt bValue
-            return if aValue < bValue then -1 else +1
-
         return 0
 
     # Public Methods ###############################################################################
 
-    eachInputStack: (callback)->
-        for i in [0...@pattern.length]
-            stack = @getStackAtSlot(i)
-            continue unless stack?
-            callback stack
-
-    eachOutputStack: (callback)->
-        for stack in @output
-            callback stack
-
-    eachToolStack: (callback)->
-        for stack in @tools
-            callback stack
-
-    getInputCount: ->
-        result = 0
-        for stack in @input
-            result += stack.quantity
-        return result
-
     getStackAtSlot: (patternSlot)->
         trueIndex = 0:0, 1:1, 2:2, 3:4, 4:5, 5:6, 6:8, 7:9, 8:10
         patternDigit = @pattern[trueIndex[patternSlot]]
@@ -101,13 +67,7 @@ module.exports = class Recipe extends BaseModel
 
         return stack
 
-    getOutputCount: ->
-        result = 0
-        for stack in @output
-            result += stack.quantity
-        return result
-
-    getQuantityProducedOf: (itemSlug)->
+    getQuantityProduced: (itemSlug)->
         total = 0
         for stack in @output
             if stack.itemSlug.matches itemSlug
@@ -115,6 +75,16 @@ module.exports = class Recipe extends BaseModel
 
         return total
 
+    getQuantityRequired: (itemSlug)->
+        total = 0
+        for i in [0...@pattern.length]
+            stack = @getStackAtSlot i
+            continue unless stack?
+
+            if ItemSlug.equal stack.itemSlug, itemSlug
+                total += stack.quantity
+        return total
+
     hasAllTools: (modPack)->
         modPack ?= @modVersion?.mod?.modPack
         return true unless modPack
@@ -179,7 +149,7 @@ module.exports = class Recipe extends BaseModel
         if not @_slug?
             builder = new StringBuilder
             delimiterNeeded = false
-            @eachInputStack (stack)->
+            for stack in @input
                 if delimiterNeeded then builder.push ','
                 delimiterNeeded = true
 
@@ -187,12 +157,12 @@ module.exports = class Recipe extends BaseModel
                 builder.push stack.itemSlug.qualified
 
             builder.push '>'
-            @eachToolStack (stack)->
+            for stack in @tools
                 builder.push stack.itemSlug.qualified
             builder.push '>'
 
             delimiterNeeded = false
-            @eachOutputStack (stack)->
+            for stack in @output
                 if delimiterNeeded then builder.push ','
                 delimiterNeeded = true
 
@@ -215,7 +185,9 @@ module.exports = class Recipe extends BaseModel
         needsDelimiter = false
         for stack in @input
             if needsDelimiter then result.push ', '
-            result.push stack.toString()
+            result.push @getQuantityRequired stack.itemSlug
+            result.push ' '
+            result.push stack.itemSlug
             needsDelimiter = true
         result.push ']'
 
@@ -223,7 +195,9 @@ module.exports = class Recipe extends BaseModel
         needsDelimiter = false
         for stack in @output
             if needsDelimiter then result.push ', '
-            result.push stack.toString()
+            result.push @getQuantityProduced stack.itemSlug
+            result.push ' '
+            result.push stack.itemSlug
             needsDelimiter = true
         result.push ']'
 

src/coffee/models/step.coffee

@@ -31,5 +31,5 @@ module.exports = class Step extends BaseModel
 
     _computeInventory: ->
         @inventory.clear()
-        @recipe.eachInputStack (stack)=>
+        for stack in @recipe.input
             @inventory.add stack.itemSlug, stack.quantity * @multiplier