tiller.lua

local monitor = peripheral.wrap("right")

function getCoarseDirtAmount()
    local blockName = "minecraft:coarse_dirt"
    local total = 0

    for slot=1, 16 do
        local item = turtle.getItemDetail(slot)
        if item and item.name == blockName then
            total = total + item.count
        end
    end

    return total
end

function doDig()
    local foundCoarseDirt = false
    local slot = 0
    for i=2, 15 do
        local b = turtle.getItemDetail(i)
        if b and b.name == "minecraft:coarse_dirt" then
            foundCoarseDirt = true
            slot = i
            break
        end
    end

    if foundCoarseDirt == false then
        return false
    end

    turtle.select(slot)
    turtle.place()

    turtle.dig()

    turtle.select(16)
    turtle.equipRight()
    turtle.dig()
    turtle.equipRight()

    turtle.select(1)
    turtle.dropUp()

    return true
end

local amount = getCoarseDirtAmount()
local upToThen = 0

while doDig() do
    upToThen = upToThen + 1
    monitor.clear()
    monitor.setCursorPos(1, 1)
    monitor.setTextColor(colors.lime)
    monitor.write("TILLER_d")

    monitor.setCursorPos(1, 2)
    monitor.setTextColor(colors.white)
    monitor.write("At")
    monitor.setCursorPos(1, 3)
    monitor.write(""..upToThen.."/"..amount)
end

monitor.clear()
monitor.setTextColor(colors.lime)
monitor.setCursorPos(1, 1)
monitor.write("--------")
monitor.setCursorPos(1, 2)
monitor.write("Tilling")
monitor.setCursorPos(1, 3)
monitor.write("complete")
monitor.setCursorPos(1, 4)