Turtle Cube v1.1

args={...} -- Basicaly write *yourprogram* CubeDepth CubeWidth CubeHeight - for example | mine 2 2 | mines out cube 2x2x1
x=tonumber(args[1])   -- Takes negative dimensions in all directions too!
if x == nil then
 x=1
end
y=tonumber(args[2])
if y == nil then
 y=1
end
z=tonumber(args[3])
if z == nil then
 z=1
end
moves=0
-- Few functions so that the code is "easier" to code  (this mainly includes weird exceptions and failsafes)
function midPrint(text,color)
 term.setBackgroundColor(color)
 term.clear()
 r,t=term.getSize()
 t=t/2+1
 r=(r/2)-(string.len(text)/2)+1
 term.setCursorPos(r,t)
 print(text)
end
function Forward()
 while not turtle.detect() and not turtle.forward() do
 midPrint("Blocked!",colors.red)
 end
end
function Dig()
 while turtle.detect() do
  turtle.dig()
 end
end
function Up()
 while not turtle.detectUp() and not turtle.up() do
  midPrint("Blocked!",colors.red)
 end
end
function DigUp()
 while turtle.detectUp() do
  turtle.digUp()
 end
end
function Down()
 while not turtle.detectDown() and not turtle.down() do
  midPrint("Blocked!",colors.red)
 end
end
function DigDown()
 while turtle.detectDown() do
  turtle.digDown()
 end
end

local yOdd=false
-- Negative coords logic conversion
if z<0 then
 Zneg=true
 z=z*(-1)
end
if y<0 and x>0 then
 turtle.turnLeft()
 Ymem=y
 y=x
 x=Ymem*(-1)
elseif y<0 and x<0 then
 turtle.turnLeft(2)
 yOdd=true
 Ymem=y
 y=x*(-1)
 x=Ymem*(-1)
elseif y>0 and x<0 then
 turtle.turnRight()
 Ymem=y
 y=x*(-1)
 x=Ymem
end
--Fuel
while turtle.getFuelLevel()<(x*y*z) do
    local InventorySlots=16
    while turtle.select(InventorySlots) do
        midPrint(("Trying to find fuel! ("..((math.floor((x*y*z-turtle.getFuelLevel())/80))+1).." Required)"),colors.red)
        if turtle.getItemDetail() then
           if (tostring(turtle.getItemDetail().name)=="minecraft:coal") then
               break
           end
        end
        InventorySlots=InventorySlots-1
        if InventorySlots==0 then
            InventorySlots=16
            sleep(1)
        end
    end
    while ((turtle.getItemCount())<((math.floor((x*y*z-turtle.getFuelLevel())/80))+1)) do
        if turtle.getItemDetail() then
            if  (tostring(turtle.getItemDetail().name)=="minecraft:coal") then
                midPrint(("Not enough Fuel! ("..((math.floor((x*y*z-turtle.getFuelLevel())/80))+1).." Required)"),colors.yellow)
                sleep(3)
            else
                break
            end
        else
            break
        end
    end
    if ((turtle.getItemCount())>((math.floor((x*y*z-turtle.getFuelLevel())/80)))) and (tostring(turtle.getItemDetail().name)=="minecraft:coal") then
        turtle.refuel((math.floor((x*y*z-turtle.getFuelLevel())/80))+1)
        break
    end
end
-- Main loop
local l=false
for i=z-1,0,-1 do
    for m=y-1,1,-1 do
        for n=x-1,1,-1 do
            Dig()
            Forward()
            moves=moves+1
            midPrint((tostring((moves/(x*y*z))*100).."%"),colors.green)
        end
        if not yOdd then
            if not l then
                yOdd=true
                turtle.turnRight()
            end
            if x==1 and not l then
                yOdd=false
                l=true
            end
            Dig()
            Forward()
            moves=moves+1
            midPrint((tostring((moves/(x*y*z))*100).."%"),colors.green)
            if not l then
                turtle.turnRight()
            end
        else
            yOdd=false
            turtle.turnLeft()
            Dig()
            Forward()
            moves=moves+1
            midPrint((tostring((moves/(x*y*z))*100).."%"),colors.green)
            turtle.turnLeft()
        end
    end
    for n=x-1,1,-1 do
        Dig()
        Forward()
        moves=moves+1
        midPrint((tostring((moves/(x*y*z))*100).."%"),colors.green)
    end
    if i>0 then
        if Zneg then
            DigDown()
            Down()
            moves=moves+1
            midPrint((tostring((moves/(x*y*z))*100).."%"),colors.green)
            if x>1 or y>1 then
                turtle.turnLeft()
                turtle.turnLeft()
            end
        else
            DigUp()
            Up()
            moves=moves+1
            midPrint((tostring((moves/(x*y*z))*100).."%"),colors.green)
            if x>1 or y>1 then
                turtle.turnLeft()
                turtle.turnLeft()
            end
        end
    end
end
midPrint("Complete",colors.blue)
term.setCursorPos(1,1)