Turtle Dig Progress

--Declare nescessary variables

local x, y = 0,0
local direction = "north"
local homeCoordX, homeCoordY = 0, 0

local digSize = ...

local success, idtable = turtle.inspectDown()

if success and idtable.name == "minecraft:chest" then --Make sure there is a chest at Home
    print("Success")
else
    error("Need chest below turtle to start digging!")
end

function testForAvailableFuel()
    for i = 1, 16 do
        turtle.select(i)
        if turtle.refuel(0) then --If the item in slot i is fuel, then return true but don't use it.
            return true
        end
    end
    return false
end

--[[function testForInvSpace() --Unsure how to go about function
    for i = 1, 16 do
        turtle.select(i)
        if turtle.
end]]

function fuel()
    local testSuccess = testForAvailableFuel()
    if turtle.getFuelLevel() <= math.floor(turtle.getFuelLimit()/2) and testSuccess == true then --If the turtle's fuel is less than half the limit AND there is fuel available
        for i = 1, 16 do
            turtle.select(i)
            if turtle.refuel(0) then
                turtle.refuel(math.floor(turtle.getItemCount(i)/2))
            end
        end
    end
end

function digForward(dirToGo, amount)
    for i = 1, amount do
        if dirToGo == "north" then --If needs to go north..
            y = y + 1
            if direction == "north" then --And is facing north..
                turtle.forward()
            elseif direction == "south" then --Facing south..
                turtle.turnLeft()
                turtle.turnLeft()
                turtle.forward()
            elseif direction == "west" then
                turtle.turnRight()
                turtle.forward()
            elseif direction == "east" then
                turtle.turnLeft()
                turtle.forward()
            end
            direction = "north"
        elseif dirToGo == "east" then --If needs to go east..
            x = x + 1
            if direction == "north" then
                turtle.turnRight()
                turtle.forward()
            elseif direction == "west" then
                turtle.turnLeft()
                turtle.turnLeft()
                turtle.forward()
            elseif direction == "east" then
                turtle.forward()
            elseif direction == "south" then
                turtle.turnLeft()
                turtle.forward()
            end
            direction = "east"
        elseif dirToGo == "south" then --If needs to go south..
            y = y - 1
            if direction == "south" then
                turtle.forward()
            elseif direction == "north" then
                turtle.turnLeft()
                turtle.turnLeft()
                turtle.forward()
            elseif direction == "east" then
                turtle.turnRight()
                turtle.forward()
            elseif direction == "west" then
                turtle.turnLeft()
                turtle.forward()
            end
            direction = "south"
        elseif dirToGo == "west" then --If needs to go west..
            x = x - 1
            if direction == "west" then
                turtle.forward()
            elseif direction == "east" then
                turtle.turnLeft()
                turtle.turnLeft()
                turtle.forward()
            elseif direction == "south" then
                turtle.turnRight()
                turtle.forward()
            elseif direction == "north" then
                turtle.turnLeft()
                turtle.forward()
            end
            direction = "west"
        end
        fuel()
    end
end

 --[[Turtle needs to dig in a perfect square, digSize x digSize in size.
    To do this, go north digSize, east digSize - 1, south digSize - 1, etc.]]

function basicDig()
    if turtle.detectUp() then turtle.digUp() end
    if turtle.detectDown() then turtle.digDown() end
    if turtle.detect() then turtle.dig() end
end

local compassRotation = {"north", "east", "south", "west"}

function dig(amt) --Dig function; parameter "amt", same as digSize specified in beginning
    local digLeft = amt
    for i = 1, digLeft do
        basicDig()

end

dig(digSize)