Branch

--[[
    Author
        Rasmus Sommer aka. TheSommer
        youtube.com/thesommersmc
        twitch.tv/thesommer

    How to use:
        Slot 1 - Fuel
        Slot 2 - Bridge material
        Slot 3 - Torches

        branch <length>
--]]

local tArgs = { ... }
if #tArgs ~= 1 then
    print( "Usage: branch <length>" )
    return
end

local length = tonumber( tArgs[1] )
if length < 1 then
    print( "Branch length must be positive" )
    return
end

local function tryRefuel()
    if turtle.getFuelLevel() == 0 then
        turtle.select(1)
        turtle.refuel(1)
    end
end

local function tryDig()
    while turtle.detect() == true do
        turtle.dig()
        sleep(0.5)
    end
end

local function tryDigUp()
    while turtle.detectUp() == true do
        turtle.digUp()
        sleep(0.5)
    end
end

local function tryUp()
    tryDigUp()
    tryRefuel()
    turtle.up()
end

local function tryDown()
    while turtle.detectDown() == true do
        turtle.digDown()
        sleep(0.5)
    end
    tryRefuel()
    turtle.down()
end

local function tryForward()
    tryDig()
    tryRefuel()
    turtle.forward()
end

local function makeBridge()
    if turtle.detectDown() == false then
        turtle.select(2)
        turtle.placeDown()
    end
end

local count = 1

for i = 1, length do
    tryForward()
    makeBridge()
    tryDigUp()
    if count % 8 == 0 then
        turtle.turnRight()
        turtle.turnRight()
        turtle.select(3)
        turtle.place()
        turtle.turnRight()
        turtle.turnRight()
    end
    count = count + 1
end