Branch 0.8

local args = {...}
-- Actual length = length*torchesInterval
local length = 10
local torchesInterval = 10
local branches = 2
local branchesinterval = 4
local torchSlot = 1
local chestSlot = 2
local blockSlot = 3
local fuelNeed = length * (torchesInterval+2)

local function forward()
    while (not turtle.forward()) do
        if (turtle.detect()) then
            turtle.dig()
        else
            turtle.attack()
        end
    end
end

local function down()
    while (not turtle.down()) do
        if (turtle.detectDown()) then
            turtle.digDown()
        else
            turtle.attackDown()
        end
    end
end

local function up()
    while (not turtle.up()) do
        if (turtle.detectUp()) then
            turtle.digUp()
        else
            turtle.attackUp()
        end
    end
end

local function dig()
    turtle.digDown()
end

local function alwaysFalse()
    return false
end

local function placeBlock(detect, place, slot)
    if (not detect()) then
        turtle.select(slot)
        place()
    end
end

local function place(slot)
    down()
    dig()
    placeBlock(alwaysFalse, turtle.placeDown, blockSlot)
    up()
    placeBlock(alwaysFalse, turtle.placeDown, slot)
end

local function branchLoop()
    for b=1, branches do
        for i=1, length do
            for j=1, torchesInterval do
                forward()
                placeBlock(turtle.detectUp, turtle.placeUp, blockSlot)
                dig()
            end
            place(torchSlot)
        end
        turtle.turnLeft()
        for i=1, branchesinterval do
            forward()
            placeBlock(turtle.detectUp, turtle.placeUp, blockSlot)
            dig()
        end
        place(torchSlot)

        turtle.turnRight()
        forward()
        place(chestSlot)
        for k=16, blockSlot+1, -1 do
            turtle.select(k)
            turtle.dropDown()
        end
        turtle.turnLeft()
        turtle.turnLeft()
        forward()
    end
end

local function mainLoop()
    branchLoop()
end

mainLoop()