New Branch Mining Program

--Getting the variables
local tArgs = { ... }
if #tArgs < 1 then
    print("Usage: branch <length> <branches> <torches>")
    return true
end
steps = tonumber(tArgs[1])
branches = tonumber(tArgs[2])
if #tArgs >= 3 and tArgs[3] == "nt" then
    torch = false
else
    torch = true
end

-- figure out how long to tunnel to accomodate the number of branches
tunnellength = branches * 4
tunnelprogram = "tunnel"

shell.run(tunnelprogram,tunnellength)

-- tunnel completed, turn around and return to the beginning branch
turtle.turnLeft()
turtle.forward()
turtle.turnLeft()

tunnelreturn = tunnellength - 1

for x = 1, tunnelreturn do
    turtle.forward()
end

turtle.turnRight()

for z = 1, 2 do
    if z ~= 1 then
        -- left side complete, reposition for the right side
        turtle.forward()
        turtle.forward()
        turtle.turnRight()
        turtle.forward()
        turtle.forward()
        turtle.turnLeft()
        turtle.down()
    end
    -- should now be at the start, do the correct number of branches
    for y = 1, branches do
        if y ~= 1 then
            turtle.turnLeft()
            turtle.forward()
            turtle.forward()
            turtle.forward()
            turtle.forward()
            turtle.turnLeft()
            turtle.down()
        end
        --Starting the dig
        for x = 1, steps do
            if not turtle.forward() then
                repeat
                    turtle.dig()
                    sleep(0.6)
                until turtle.forward()
            end
        end
        --Getting into position for the return
        turtle.digUp()
        turtle.up()
        turtle.turnRight()
        turtle.turnRight()
        --Starting the return
        for x = 1, steps do
            if torch and x % 8 == 0 then
                turtle.placeDown()
            end
            if not turtle.forward() then
                repeat
                    turtle.dig()
                    sleep(0.25)
                until turtle.forward()
            end
        end
        -- dump all items from all slots apart from slot 1
        for v = 2, 16 do
            turtle.select(v)
            turtle.drop()
        end
        turtle.select(1)
    end
end

-- go to the start ready for another tunnel
turtle.forward()
turtle.down()
turtle.turnRight()
tunnelend = tunnellength + 1
for y = 1, tunnelend do
    turtle.forward()
end
if not turtle.forward() then
    repeat
        turtle.dig()
        sleep(0.6)
    until turtle.forward()
end