inv Manager

local whiteList = {
    "minecraft:skull",     3,
    "minecraft:soul_sand", 4,
}

while true do
    local bool,data = turtle.inspect()
    if bool then
        print("Redstone level is "..data.metadata)
    end
    if data.metadata > 9 then
        print("Redstone acceptable. Doing the thing")
        turtle.turnLeft()

        for i = 1, 16 do --Dump inventory
            local data = turtle.getItemDetail(i)
            if data then
                turtle.select(i)
                turtle.drop()
            end
        end

        --Grab everything in 16 slot chest and make a list of each item, slot, and count
        local itemList = {}
        turtle.select(1)
        for i = 1, 16 do
            turtle.select(i)
            turtle.suck()
            local data = turtle.getItemDetail(i)
            if not itemList[data.name] then --If new item then make a table for it
                itemList[data.name] = {}
                itemList[data.name][1] = { count = data.count, slot = i }
            else --Item has already been seen. Insert an entry
                itemList[data.name][ #itemList[data.name]+1 ] = {count = data.count, slot = i}
            end
        end

        --Clear inventory of everything and all amounts not specified in whiteList
        for i,name in pairs(itemList) do --Iterate through every name in the item list
            for k = 1, #whiteList, 2 do --Iterate through whitelist and check name against it

                if name ~= whiteList[k] and k == #whiteList-1 do --Name is not on whitelist. Dump it
                    for j = 1, #itemList[name] do
                        turtle.select(itemList[name][j].slot)
                        turtle.drop()
                    end
                    break
                elseif name == whiteList[k] then --Name is on the whitelist. Dump extra items
                    --Get target amount for whitelisted item
                    local tA
                    for j = 1, #whiteList, 2 do
                        if whiteList[j] == name then
                            tA = whitelist[j+1]
                            break
                        end
                    end
                    --Dump extra
                    for l = 1, #itemList[name] do
                        local keepAmount = 0
                        if itemList[name][l].count + keepAmount < tA then --We don't have enough saved yet
                            if itemList[l].count > tA + keepAmount then --Too much in this slot
                                turtle.drop(itemList[name][l].count-tA)
                                keepAmount = tA
                            else
                                keepAmount = keepAmount + itemList[name][l].count --Not enough in just this slot
                            end
                        else --We've saved enough. Dump the extra
                            turtle.select(itemList[name][l].slot)
                            turtle.drop()
                        end
                    end
                end
            end
        end
    else
        print("Not doing the thing")
    end
    turtle.turnRight()
end