Specify item damage

craft.lua

@@ -9,39 +9,64 @@ RESULT_SLOT = 4
 
 local iron_pickaxe_recipe = {
     result = {
-        name = 'minecraft:iron_pickaxe',
+        item = { 'minecraft:iron_pickaxe', 0 },
         count = 1,
     },
     ingredients = {
-        'minecraft:iron_ingot', 'minecraft:iron_ingot', 'minecraft:iron_ingot',
-        nil, 'minecraft:stick', nil,
-        nil, 'minecraft:stick', nil,
+        -- pair of name (string id) and damage separated by ';'
+        'minecraft:iron_ingot;0', 'minecraft:iron_ingot;0', 'minecraft:iron_ingot;0',
+        nil, 'minecraft:stick;0', nil,
+        nil, 'minecraft:stick;0', nil,
     }
 }
 
 -- robots inventory is 4 wide and crafting uses the top left portion
 local slot_map = {
-    1,2,3,
-    5,6,7,
-    9,10,11
+    1, 2, 3,
+    5, 6, 7,
+    9, 10, 11
 }
 
--- local function read_chest_contents()
---     local size = inventory.getInventorySize(sides.forward)
---     for slot = 1, size do
---         local stack = inventory.getStackInSlot(sides.forward, slot)
---         if stack then
---             if stack.name == item then
---                 inventory.suckFromSlot(sides.forward, slot, 1)
---                 return true
---             end
---         end
---     end
--- end
+---"item" being pair string id and damage separated by ';' eg. "minecraft:wool;3"
+---returns "minecraft:wool", 3
+---@param str string
+---@param delimiter string
+---@return string|nil
+---@return number|nil
+local function parse_item(str, delimiter)
+    local pos = string.find(str, delimiter)
+    if not pos then
+        return nil,nil
+    end
+    return string.sub(str, 1, pos-1), tonumber(string.sub(str, pos+1))
+end
+
+---read the facing inventory and return a table of item names and their count or nil if not facing an inventory
+---@return table|nil
+local function read_chest_contents()
+    local contents = {}
+    local size = inventory.getInventorySize(sides.forward)
+    if not size then
+        return nil
+    end
+    for slot = 1, size do
+        local stack = inventory.getStackInSlot(sides.forward, slot)
+        if stack then
+            local name = stack.name .. ";" .. stack.damage
+            if contents[name] then
+                contents[name] = contents[name] + stack.size
+            else
+                contents[name] = stack.size
+            end
+        end
+    end
+    return contents
+end
 
--- store the item in the selected slot into the facing inventory
+---store the item in the selected slot into the facing inventory
+---@return boolean
 local function store_item()
--- check if that item is present in the inventory
+    -- check if that item is present in the inventory
     local item = inventory.getStackInInternalSlot()
 
     local size = inventory.getInventorySize(sides.forward)
@@ -82,9 +107,14 @@ local function store_item()
     end
 end
 
--- Search the facing chest for "item" and take "count" items and place them in "slot"
--- Returns number of items fetched
+---Search the facing chest for "item" and take "count" items and place them in "slot"
+---"item" being pair string id and damage separated by ';' eg. "minecraft:wool;3"
+---Returns number of items fetched
+---@param item string
+---@param output_slot number
+---@return boolean
 local function fetch_item(item, output_slot)
+    local name, damage = parse_item(item, ";")
     robot.select(output_slot)
     local size = inventory.getInventorySize(sides.forward)
     if not size then
@@ -95,7 +125,7 @@ local function fetch_item(item, output_slot)
     for slot = 1, size do
         local stack = inventory.getStackInSlot(sides.forward, slot)
         if stack then
-            if stack.name == item then
+            if stack.name == name and stack.damage == damage then
                 inventory.suckFromSlot(sides.forward, slot, 1)
                 return true
             end
@@ -106,8 +136,14 @@ local function fetch_item(item, output_slot)
     return false
 end
 
--- accepts a recipe table containing result and ingredients
+---accepts a recipe table containing result and ingredients
+---@param recipe table
+---@return boolean
 local function craft_recipe(recipe)
+    if inventory.getStackInInternalSlot(RESULT_SLOT) then
+        print('Cannot craft - output slot occupied')
+        return false
+    end
     for i, ingredient in pairs(recipe.ingredients) do
         print('Fetching ' .. ingredient)
         fetch_item(ingredient, slot_map[i])
@@ -118,10 +154,12 @@ local function craft_recipe(recipe)
 
     -- craft the resulting item
     local crafted = crafting.craft(1)
-
     if not crafted then
         print('Crafting failed')
+        return false
     end
+
+    return store_item()
 end
 
 -- local target = ...
@@ -131,5 +169,15 @@ end
 --     return
 -- end
 
--- craft_recipe(iron_pickaxe_recipe)
-store_item()
+craft_recipe(iron_pickaxe_recipe)
+
+-- store_item()
+
+-- local contents = read_chest_contents()
+-- if contents then
+--     for k,v in pairs(contents) do
+--         print(k,v)
+--     end
+-- else
+--     print('Not facing a chest')
+-- end