bakebread

SLOT_COUNT = 16
function getItemIndex(itemName)
    for slot = 1, SLOT_COUNT, 1 do
        local item = turtle.getItemDetail(slot)
        if (item ~= nil) then
            if(item["name"] ==itemName) then
                return slot
            end
        end
    end
end

function getPreferred(low, high)
    local wheatCount  = turtle.getItemCount(getItemIndex("minecraft:wheat"))
    if wheatCount < low and turtle.suckUp() == false then
        return false
    end
    if wheatCount < high and turtle.suckUp() == true then
        return false
    end
    if wheatCount > low and turtle.suckUp() == false then
        return true
    end
    if wheatCount <= high then
        return true
    end
end


function bakeBread()
    while true do
        local wheatIndex  = getItemIndex("minecraft:wheat")
        local breadIndex = getItemIndex("minecraft:bread")
        if wheatIndex == nil then
            repeat
                turtle.suckUp()
            until getPreferred(3, 64)
        end
        wheatIndexGlobal = turtle.getItemCount(wheatIndex)
        for i = 1, 3, 1 do
            local selectIndex = 4 + i
            turtle.select(wheatIndex)
            turtle.transferTo(selectIndex, 21)
        end
        if wheatIndex ~= nil then
            repeat
                turtle.select(wheatIndex)
                turtle.dropUp()
            until wheatIndex == nil
        end
        turtle.craft()
        if breadIndex ~= nil then
            turtle.select(breadIndex)
            turtle.dropUp()
        end
    end
end

while true do
    bakeBread()
end