Miner 2.1 (alpha,works but is not done yet)

--[[
MINER

Made by HDGamer14

Alpha had has bugs most likely :(

--]]

local rows,length,torchs,x,y,x1,y1,direction,direction1,miner

function turn(dirc)
    if dirc == "left" then
        turtle.turnLeft()
        if direction == 3 then
            direction = 0
        else
            direction = direction + 1
        end
    else
        turtle.turnRight()
        if direction == 0 then
            direction = 3
        else
            direction = direction - 1
        end
    end
end

function goforward()
    if turtle.forward() == false then
        repeat
            turtle.dig()
            turtle.attack()
            sleep(0.5)
        until turtle.forward() == true
    end
end

function forward()
    checkfuel()
    if direction == 0 then
        goforward()
        x = x + 1
    elseif direction == 2 then
        goforward()
        x = x - 1
    elseif direction == 3 then
        goforward()
        y = y - 1
    else
        goforward()
        y = y + 1
    end
end

function checkfuel()
    if turtle.getFuelLevel() < 5 then
        print("Place fuel in slot 15")
        repeat
        sleep(1)
        until turtle.getItemCount(15) > 0
        turtle.select(15)
        turtle.refuel(turtle.getItemCount(15))
        print("Refueled, curent about of fuel : "..turtle.getFuelLevel())
    end
end

function gohome()
    x1 = x
    y1 = y
    direction1 = direction
    while direction ~= 3 do
        turn("right")
    end
    while y ~= 0 do
        forward()
    end
    turn("right")
    while x ~= 0 do
        forward()
    end
end

function goback()
    while direction ~= 0 do
        turn("right")
    end
    while x ~= x1 do
        forward()
    end
    turn("left")
    while y ~= y1 do
        forward()
    end
    while direction ~= direction1 do
        turn("right")
    end
end

function mine()
  turtle.digUp()
  turtle.dig()
  turtle.digDown()
end

function torch( )
    if torchs == true then
        if math.fmod(x,4) == 0 then
            if math.fmod(y,4) == 0 then
                turtle.select(16)
                turtle.placeDown()
            end
        end
    end
end

function row(lrow)
    for i=1,lrow do
        mine()
        torch()
        if turtle.getItemCount(12) > 0 then
            gohome()
            unload()
            goback()
        end
        forward()
--      print("X : ".. x)
--      print("Y : ".. y)
--      print("direction : "..direction)
--      print()
    end
end

function newrow()
    --forward()
    if (y == rows - 1) then
--      print("Swag rows = y")
        if direction == 0 then
            turn("right")
            mine()
        else
            turn("left")
            mine()
        end
    else
        if direction == 0 then
            turn("left")
            mine()
            forward()
            turn("left")
        else
            turn("right")
            mine()
            forward()
            turn("right")
        end
    end
end

function unload()
  print ("Unloading items...")
  for n=1,15 do
    turtle.select(n)
    turtle.drop()
  end
  turtle.select(1)
end

function cycle()
    row(length - 1)
    newrow()
end


x = 0
y = 0
direction = 0



-- Program start

  shell.run("clear")
  print("Place chest behind me!")
  print("How far you you like me to go?")
    length=read()
  print("How many rows would you like me to mine?")
    rows=read(number)
   -- if row == 1 then
   --   newRow = false
   -- end
  print("Would you like me to use torches? (yes/no)")
    torchs=read()
  if torchs == "yes" then
    print("Place torhes in slot 16")
    repeat
      sleep(1)
    until turtle.getItemCount(16) > 0

 torchs = true
   else
 torchs = false
  end

miner = rows

repeat
  cycle()
  miner = miner - 1
until miner == 0

gohome()
unload()

--print("X : ".. x)
--print("Y : ".. y)
--print("direction : "..direction)
print("All done!")