Crafting a recipe

craft.lua

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+local component = require("component")
+local robot = require("robot")
+local sides = require("sides")
+
+local crafting = component.crafting
+local inventory = component.inventory_controller
+
+RESULT_SLOT = 4
+
+local iron_pickaxe_recipe = {
+    result = {
+        name = 'minecraft:iron_pickaxe',
+        count = 1,
+    },
+    ingredients = {
+        'minecraft:iron_ingot', 'minecraft:iron_ingot', 'minecraft:iron_ingot',
+        nil, 'minecraft:stick', nil,
+        nil, 'minecraft:stick', 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
+}
+
+-- Search the facing chest for "item" and take "count" items and place them in "slot"
+-- Returns number of items fetched
+local function fetch_item(item, output_slot)
+    robot.select(output_slot)
+    local size = inventory.getInventorySize(sides.forward)
+    if not size then
+        print('Not facing a chest')
+        return false
+    end
+
+    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
+
+    print('Missing ' .. item)
+    return false
+end
+
+-- accepts a recipe table containing result and ingredients
+local function craft_recipe(recipe)
+    for i, ingredient in pairs(recipe.ingredients) do
+        print('Fetching ' .. ingredient)
+        fetch_item(ingredient, slot_map[i])
+    end
+
+    -- select slot for the result
+    robot.select(RESULT_SLOT)
+
+    -- craft the resulting item
+    local crafted = crafting.craft(1)
+
+    if not crafted then
+        print('Crafting failed')
+    end
+end
+
+-- local target = ...
+
+-- if not target then
+--     print("Usage: craft <item>")
+--     return
+-- end
+
+craft_recipe(iron_pickaxe_recipe)