Add in next/prev buttons for crafting table

src/scripts/controllers/crafting_table_controller.coffee

@@ -17,11 +17,35 @@ module.exports = class CraftingTableController extends BaseController
         options.templateName = 'crafting_table'
         super options
 
+    # Event Methods ################################################################################
+
+    onNextClicked: ->
+        @model.step += 1
+
+    onPrevClicked: ->
+        @model.step -= 1
+
     # BaseController Overrides #####################################################################
 
     onDidRender: ->
         @gridController = @addChild CraftingGridController, '.view__crafting_grid', model:@model.grid
 
-        @$nextButton = @$('button[name="next"]')
-        @$prevButton = @$('button[name="prev"]')
+        @$next = @$('.next')
+        @$prev = @$('.prev')
         super
+
+    refresh: ->
+        @$prev.removeClass 'enabled'
+        @$next.removeClass 'enabled'
+
+        if @model.hasSteps
+            if @model.hasPrevStep then @$prev.addClass 'enabled'
+            if @model.hasNextStep then @$next.addClass 'enabled'
+
+        super
+
+    # Backbone.View Overrides ######################################################################
+
+    events:
+        'click .next': 'onNextClicked'
+        'click .prev': 'onPrevClicked'

src/scripts/models/crafting_table.coffee

@@ -15,23 +15,70 @@ module.exports = class CraftingTable extends BaseModel
     constructor: (attributes={}, options={})->
         if not attributes.plan? then throw new Error "attributes.plan is required"
         attributes.grid ?= new CraftingGrid modPack:attributes.plan.modPack
-        attributes.step ?= 0
         super attributes, options
 
         @plan.on 'change', => @reset()
+        @_step = 0
+        @_steps = []
+
+        Object.defineProperties this, {
+            hasNextStep: { get:@hasNextStep           }
+            hasPrevStep: { get:@hasPrevStep           }
+            hasSteps:    { get:@hasSteps              }
+            step:        { get:@getStep, set:@setStep }
+        }
 
     # Public Methods ###############################################################################
 
     reset: ->
-        logger.trace "CraftingTable.reset()"
-
+        @_compactSteps()
         @step = 0
-        @grid.recipe = @plan.steps[0]
+
+        return this
+
+    # Property Methods #############################################################################
+
+    hasNextStep: ->
+        return @_step + 1 < @_steps.length
+
+    hasPrevStep: ->
+        return @_step > 0
+
+    getStep: ->
+        return @_step
+
+    setStep: (newStep)->
+        newStep = Math.max 0, Math.min @_steps.length, newStep
+
+        @_step = newStep
+        @grid.recipe = @_steps[@_step]?.recipe
         @trigger 'change', this
 
         return this
 
+    hasSteps: ->
+        return @_steps.length > 0
+
     # Object Overrides #############################################################################
 
     toString: ->
-        return "#{@constructor.name} (#{@cid}) { plan:#{@plan}, step:#{@step} }"
+        return "#{@constructor.name} (#{@cid}) { plan:#{@plan}, step:#{@_step} }"
+
+    # Private Methods ##############################################################################
+
+    _compactSteps: ->
+        @_steps = []
+        currentStep = null
+
+        for recipe in @plan.steps
+            if currentStep?
+                if currentStep.recipe.name is recipe.name
+                    currentStep.multiplier += 1
+                else
+                    currentStep = null
+
+            if not currentStep
+                currentStep = multiplier:1, recipe:recipe
+                @_steps.push currentStep
+
+        return @_steps

src/scripts/models/recipe.coffee

@@ -27,6 +27,7 @@ module.exports = class Recipe extends BaseModel
     getItemSlugAt: (index)->
         patternDigit = @pattern[index]
         return null unless patternDigit?
+        return null unless patternDigit.match /[0-9]/
 
         stack = @input[parseInt(patternDigit)]
         return null unless stack?