Mining Turtle Quarry Program

-- Mining Turtle Quarry Program Version 1.0

local distance = 0

-- Get quarry size
print ("Height (downwards):")
local height = tonumber(read())
print ("")
print ("Width (to the left):")
local width = tonumber(read())
print ("")
print ("Length (straight ahead):")
local length = tonumber(read())
length = length - 1
print ("")

function emptyInventory()
    print("Emptying inventory...")
    for i=1,16 do
        turtle.select(i)
        turtle.drop()
    end
    turtle.select(1)
    print("Finished emptying inventory.")
end

function refuel()
    print("Refueling...")
    turtle.select(1)
    while true do
        if turtle.suck() == false then
            turtle.dropUp()
            break
        end
        turtle.refuel()
        turtle.dropUp()
    end
    print("Finished refueling.")
    emptyInventory()
end

function resupply(h)
    -- return home
    print("Returning home for resupply...")
    for i=1,h do
        turtle.up()
    end
    -- empty Inventory
    turtle.turnRight()
    turtle.turnRight()
    emptyInventory()
    -- refuel
    turtle.turnRight()
    refuel()
    -- get back
    turtle.turnRight()
    for i=1,h do
        turtle.down()
    end
    print("Finished resupply.")
end

-- loop
for h=1,height do
    -- move to layer
    turtle.digDown()
    turtle.down()
    distance = distance + 1
    for w=1,width do
        -- dig line
        for l=1,length do
            turtle.dig()
            if l<length then
                if turtle.forward() == false then
                    repeat
                    turtle.dig()
                    sleep(0.25)  -- small sleep to allow for gravel/sand to fall.
                    until turtle.forward() == true
                end
                distance = distance + 1
            end
            if l==length then
                if turtle.detect() == true then
                    repeat
                    turtle.dig()
                    sleep(0.25)  -- small sleep to allow for gravel/sand to fall.
                    until turtle.detect() == false
                end
            end
        end
        -- move backwards
        for i=2,length do
            turtle.back()
            distance = distance - 1
        end
        -- move to next line
        if w<width then
            turtle.turnLeft()
            turtle.dig()
            if turtle.forward() == false then
                repeat
                turtle.dig()
                sleep(0.25)  -- small sleep to allow for gravel/sand to fall.
                until turtle.forward() == true
            end
            distance = distance + 1
            turtle.turnRight()
        end
        -- dump unwanted items
        print("Dumping unwanted items...")
        for i=1,16 do
            local data = turtle.getItemDetail(i)
            if data then
                if data.name == "minecraft:cobblestone" then
                    turtle.select(i)
                    turtle.drop()
                end
                if data.name == "minecraft:dirt" then
                    turtle.select(i)
                    turtle.drop()
                end
                if data.name == "minecraft:diorite" then
                    turtle.select(i)
                    turtle.drop()
                end
                if data.name == "minecraft:granite" then
                    turtle.select(i)
                    turtle.drop()
                end
                if data.name == "minecraft:andesite" then
                    turtle.select(i)
                    turtle.drop()
                end
                if data.name == "minecraft:gravel" then
                    turtle.select(i)
                    turtle.drop()
                end
                if data.name == "byg:scoria_cobblestone" then
                    turtle.select(i)
                    turtle.drop()
                end
                if data.name == "blockus:limestone" then
                    turtle.select(i)
                    turtle.drop()
                end
                if data.name == "croptosis:potash" then
                    turtle.select(i)
                    turtle.drop()
                end
                if data.name == "mysticalagriculture:inferium_essence" then
                    turtle.select(i)
                    turtle.drop()
                end
                if data.name == "minecraft:flint" then
                    turtle.select(i)
                    turtle.drop()
                end
                if data.name == "promenade:blunite" then
                    turtle.select(i)
                    turtle.drop()
                end
                if data.name == "minecraft:cobbled_deepslate" then
                    turtle.select(i)
                    turtle.drop()
                end
                if data.name == "minecraft:tuff" then
                    turtle.select(i)
                    turtle.drop()
                end
            end
        end
        print("Finished dumping unwanted items.")
        turtle.select(1)
        -- check for refuel items
        print("Checking for refuel items...")
        for i=1,16 do
            turtle.select(i)
            if turtle.refuel(0) == true then
                print("Found refuel item.")
                turtle.refuel()
            end
        end
        turtle.select(1)
        print("Finished checking for refuel items.")
    end
    -- move to the right
    turtle.turnRight()
    for i=2,width do
        if turtle.forward() == false then
            repeat
            turtle.dig()
            sleep(0.25)  -- small sleep to allow for gravel/sand to fall.
            until turtle.forward() == true
        end
        distance = distance - 1
    end
    turtle.turnLeft()
    -- check fuel
    local fuelForNextLayer = h + width * length + 10
    local currentFuelLevel = turtle.getFuelLevel()
    print("Remaining fuel: " .. currentFuelLevel)
    if currentFuelLevel < fuelForNextLayer then
        resupply(h)
    end
    -- check inventory space
    print("Checking inventory space...")
    local freeSlots = 0
    local inventorySpace = 1024
    for i=1,16 do
        turtle.select(i)
        inventorySpace = inventorySpace - turtle.getItemCount()
        if turtle.getItemCount() == 0 then
            freeSlots = freeSlots + 1
        end
    end
    print("Free slots: " .. freeSlots)
    print("Inventory space: " .. inventorySpace)
    turtle.select(1)
    if freeSlots < 5 then
        resupply(h)
    end
    if inventorySpace < 5 * 64 then
        resupply(h)
    end
end
-- move back to top
for i=1,height do
    turtle.up()
    distance = distance - 1
end
turtle.turnRight()
turtle.turnRight()
emptyInventory()
turtle.turnRight()
turtle.turnRight()
print("Finished digging.")