extmine 0.2

args = {...}

-- length of the shaft
args[1] = args[1] or 75
-- count of the shaft circles
args[2] = args[2] or 1

local initFail = false
print("Initializing extmine API and logger...")
initFail = not(os.loadAPI("/programs/logger"))
initFail = not(os.loadAPI("/programs/extmineapi"))
if initFail then print("Initialization failed!")
else print("Complete") end

if args[1] ~= "ini" and not(initFail) then
  for i = 1, args[2] do
    -- digging circle shaft
    if not extmineapi.step(args[1]) then break end
    turtle.turnRight()
    if not extmineapi.step(1) then break end
    extmineapi.tryPlaceTorch()
    if not extmineapi.step(2) then break end
    turtle.turnRight()
    if not extmineapi.step(args[1]) then break end
    turtle.turnRight()
    if not extmineapi.step(3) then break end
    -- digging corridor with torch
    turtle.turnLeft()
    if not extmineapi.step(1) then break end
    turtle.turnLeft()
    if not extmineapi.step(3) then break end
    extmineapi.tryPlaceTorch()
    if not extmineapi.step(3) then break end
    turtle.turnLeft()
    if not extmineapi.step(1) then break end
    turtle.turnLeft()
    if not extmineapi.step(2) then break end
    turtle.turnRight()
    turtle.turnRight()
    if not extmineapi.step(2) then break end
    turtle.turnLeft()
  end
end