miningTurtle

-- pastebin run FuQ3WvPs VW70dBq0 miningTurtle
local torches = turtle.getItemCount(1)
local fuel = turtle.getItemCount(2)
local buildingMaterial = turtle.getItemCount(3)
local maxFuel = fuel
local placeTorchAt = 8 -- place torch on every N. block
local errorLv = 0
local distance = 0
local mainPathLength = 0
local mainPath = true
local subLength = 32

function checkInventory ()
    print ("Checking inventory...\n")
    torches = turtle.getItemCount(1)
    fuel = turtle.getItemCount(2)
    buildingMaterial = turtle.getItemCount(3)

    print ("Torches: " .. tostring(torches) .. "\nFuel: " .. tostring(fuel) .. "\nBuilding Material: " .. tostring(buildingMaterial) .. "\n")

    if torches <= 1 then errorLv = 1 end
    if fuel <= maxFuel / 2 and turtle.getFuelLevel() < mainPathLength then errorLv = 1 end
    if buildingMaterial <= 1 then errorLv = 1 end

    print ("Error Level: " .. tostring(errorLv) .. "\n")
end

function home ()
    print ("Returning Home..\n")
    if mainPath then
        print ("On Main Path\n")
        turtle.turnRight()
        turtle.turnRight()
        for i = 1, mainPathLength, 1 do
            turtle.forward()
        end

        print ("I am home! Or am I?\n")
    else
        print ("Not on Main Path\n")
        turtle.turnRight()
        turtle.turnRight()
        for i = 1, distance, 1 do
            turtle.forward()
        end
        turtle.turnRight()
        mainPath = true
        home()
    end
end

function moveBit (pTorch)
    print ("Moving forward...\n")
    -- Move forward, if not possible -> dig
    while not turtle.forward() do
        turtle.dig()
    end

    -- Build floor
    turtle.select(3)
    turtle.placeDown()

    -- Build lower left wall
    turtle.turnLeft()
    turtle.place()

    -- Move Up
    while not turtle.up() do
        turtle.digUp()
    end

    -- Build ceiling
    turtle.placeUp()

    -- Build upper left wall
    turtle.place()

    -- Build upper right wall
    turtle.turnRight()
    turtle.turnRight()
    turtle.place()

    -- Move down
    turtle.down()

    -- Build lower right wall
    turtle.place()

    -- Place Torch
    if pTorch then
        print ("Placing Torch\n")
        turtle.select(1)
        turtle.placeUp()
        turtle.select(3)
    end

    -- Turn back to path
    turtle.turnLeft()

    distance = distance + 1
    if mainPath then mainPathLength = mainPathLength + 1 end
end

function run ()
    print ("Starting Program...\n")
    while (true) do
        checkInventory ()
        if errorLv ~= 0 then
            home()
            return
        end

        -- Refuel
        if turtle.getFuelLevel() == 0 then
            turtle.select(2)
            turtle.refuel()
        end

        -- Strip Mine Thing
        if mainPath and distance >= 3 then
            print ("Leaving Main Path...\n")
            mainPath = false
            distance = 0
            turtle.turnRight()
        elseif not mainPath and distance >= subLength then
            print ("Going back to Main Path...\n")
            turtle.turnRight()
            turtle.turnRight()
            distance = 0
            for i = 1, subLength, 1 do
                print (tostring(i) .. " of " .. tostring(subLength) .. "\n")
                turtle.forward()
            end
            turtle.turnRight()
            mainPath = true
        end

        -- Move, Dig, Build and place Torch
        moveBit((not mainPath and (((distance + 1) % placeTorchAt == 0) or (distance + 1) == 1)))
    end
end

run()