commit 33ac91e24bf77d05f5db3649435ca142b5908084
Author: Gabriel Tofvesson <gabriel@tofvesson.se>
Date:   Thu May 15 02:16:23 2025 +0200

    Implement basic inventory scanning and transfer

diff --git a/item.lua b/item.lua
new file mode 100644
index 0000000..dec3830
--- /dev/null
+++ b/item.lua
@@ -0,0 +1,42 @@
+local util = require("util")
+
+local item = {}
+
+local metatable = {
+    __eq = util.deepEqual,
+    __metatable = nil,
+    __tostring = function(ser)
+        return textutils.serialise(ser, { compact = true })
+    end
+}
+
+function item.fromDetail(detail)
+    local detailItem = {
+        name = detail.name,
+        displayName = detail.displayName,
+        tags = detail.tags,
+        itemGroups = detail.itemGroups,
+        maxCount = detail.maxCount
+    }
+
+    setmetatable(detailItem, metatable)
+
+    return detailItem
+end
+
+function item.fromString(str)
+    local strItem = textutils.unserialize(str)
+    if type(strItem.name) ~= "string" or
+        type(strItem.displayName) ~= "string" or
+        type(strItem.tags) ~= "table" or
+        type(strItem.itemGroups) ~= "table" or
+        type(strItem.maxCount) ~= "number" then
+        error("Could not parse item: "..str)
+    end
+
+    setmetatable(strItem, metatable)
+
+    return strItem
+end
+
+return item
\ No newline at end of file
diff --git a/itemstack.lua b/itemstack.lua
new file mode 100644
index 0000000..c37f0ae
--- /dev/null
+++ b/itemstack.lua
@@ -0,0 +1,83 @@
+local item = require("item")
+
+local itemstack = {}
+local prototype = {}
+
+function prototype:isBlank()
+    return self.item == nil
+end
+
+function prototype:availableCount()
+    return self.itemLimit - self.count
+end
+
+function prototype:canTransferTo(otherStack)
+    if self:isBlank() or self.item ~= otherStack.item then
+        return 0
+    end
+
+    local availableCount = otherStack:availableCount()
+    if availableCount >= self.count then
+        return self.count
+    end
+
+    return availableCount
+end
+
+local metatable = {
+    __eq = function(a, b)
+        return a.item == b.item and
+                a.count == b.count and
+                a.itemLimit == b.itemLimit
+    end,
+    __metatable = nil,
+    __index = prototype,
+    __tostring = function(ser)
+        return textutils.serialise({
+            item = tostring(ser.item),
+            count = ser.count,
+            itemLimit = ser.itemLimit
+        }, { compact = true })
+    end
+}
+
+local function newItemStack(itemInst, count, itemLimit)
+    local stack = {
+        item = itemInst,
+        count = count,
+        itemLimit = itemLimit
+    }
+
+    setmetatable(stack, metatable)
+
+    return stack
+end
+
+function itemstack.blank(itemLimit)
+    return newItemStack(nil, 0, itemLimit)
+end
+
+function itemstack.fromItemDetail(detail, itemLimit)
+    if detail == nil then
+        return itemstack.blank(itemLimit)
+    end
+
+    return newItemStack(item.fromDetail(detail), detail.count, itemLimit)
+end
+
+function itemstack.fromString(str)
+    local strStack = textutils.unserialize(str)
+    if type(strStack.item) ~= "string" or
+        type(strStack.count) ~= "number" or
+        type(strStack.itemLimit) ~= "number" then
+        error("Could not parse itemstack: "..str)
+    end
+
+    strStack.item = item.fromString(strStack.item)
+
+    setmetatable(strStack, metatable)
+
+    return strStack
+end
+
+return itemstack
\ No newline at end of file
diff --git a/localchest.lua b/localchest.lua
new file mode 100644
index 0000000..49c83f0
--- /dev/null
+++ b/localchest.lua
@@ -0,0 +1,134 @@
+local itemstack = require("itemstack")
+
+local localchest = {}
+local prototype = {}
+
+
+function prototype:exists()
+  return self.peripheral.size() ~= nil
+end
+
+function prototype:scanSlot(slot)
+  local stack = itemstack.fromItemDetail(self.peripheral.getItemDetail(slot), self.peripheral.getItemLimit(slot))
+  self.slots[slot] = stack
+  return stack
+end
+
+function prototype:rescan()
+  if not self:exists() then
+      return false
+  end
+
+  self.slots = {}
+  self.size = self.peripheral.size()
+
+  for key,_ in pairs(self.peripheral.list()) do
+      self:scanSlot(key)
+  end
+
+  return true
+end
+
+function prototype:sanityCheck()
+    if not self:exists() then
+        return false
+    end
+
+    local listData = self.peripheral.list()
+    for key,_ in pairs(self.slots) do
+        if listData[key] == nil then
+            return false
+        end
+    end
+
+    for key,stackData in pairs(listData) do
+        local cachedStack = self.slots[key]
+        if cachedStack == nil or cachedStack.item.name ~= stackData.name or cachedStack.count ~= stackData.count then
+            return false
+        end
+    end
+
+    return true
+end
+
+function prototype:getSlot(slot)
+  local stack = self.slots[slot]
+  if stack == nil then
+      return itemstack.blank(self.peripheral.getItemLimit(slot))
+  end
+
+  return stack
+end
+
+function prototype:moveItemsTo(count, fromSlot, otherChest, toSlot)
+  if not otherChest:exists() then
+      return 0
+  end
+
+  local myStack = self:getSlot(fromSlot)
+  local targetStack = otherChest:getSlot(toSlot)
+  local txCap = myStack:canTransferTo(targetStack)
+  if count > txCap then
+      return 0
+  end
+
+  local tx = self.peripheral.pushItems(peripheral.getName(otherChest.peripheral), fromSlot, count, toSlot)
+  myStack.count = myStack.count - tx
+  targetStack.count = targetStack.count + tx
+
+  return tx
+end
+
+local metatable = {
+    __index = prototype,
+    __metatable = nil,
+    __tostring = function(ser)
+        local slots = {}
+        for key,value in pairs(ser.slots) do
+            slots[key] = tostring(value)
+        end
+
+        return textutils.serialise({
+            peripheral = peripheral.getName(ser.peripheral),
+            slots = slots,
+            size = ser.size
+        }, { compact = true })
+    end
+}
+
+function localchest.fromPeripheral(per)
+  local chest = {
+    peripheral = per,
+    slots = {},
+    size = 0
+  }
+
+  setmetatable(chest, metatable)
+
+  return chest
+end
+
+function localchest.fromString(str)
+    local chest = textutils.unserialize(str)
+    if type(chest.peripheral) ~= "string" or
+        type(chest.slots) ~= "table" or
+        type(chest.size) ~= "number" then
+        error("Could not parse localchest: "..str)
+    end
+
+    local per = peripheral.wrap(chest.peripheral)
+    if per == nil then
+        error("Could not wrap peripheral for chest: "..chest.peripheral)
+    end
+    chest.peripheral = per
+
+    for key,value in pairs(chest.slots) do
+        chest.slots[key] = itemstack.fromString(value)
+    end
+
+    setmetatable(chest, metatable)
+
+    return chest
+end
+
+return localchest
\ No newline at end of file
diff --git a/util.lua b/util.lua
new file mode 100644
index 0000000..ce7c0f2
--- /dev/null
+++ b/util.lua
@@ -0,0 +1,28 @@
+local util = {}
+
+function util.deepEqual(a, b)
+    local varType = type(a)
+    if varType ~= type(b) then
+        return false
+    end
+
+    if varType == "table" then
+        for key,_ in pairs(b) do
+            if a[key] == nil then
+                return false
+            end
+        end
+
+        for key,value in pairs(a) do
+            if not util.deepEqual(value, b[key]) then
+                return false
+            end
+        end
+
+        return true
+    end
+
+    return a == b
+end
+
+return util
\ No newline at end of file