CC Turtle Branchmine

--[[
branchmine v 1.0
by AlphaSheepPig

To use, give the turtle the following:
Slot 1: Coal
Slot 2: Cobblestone
Slot 3: Chests
Slot 4: Torches

Turtle will dig a 2 high tunnel for
100 blocks, move 5 blocks over, and
dig a second tunnel back.
It places torches along the way,
and places a chest and offloads
inventory when full.
]]


function placeTorch ()
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.select(4)
    turtle.place()
    turtle.turnLeft()
    turtle.turnLeft()
end


function offLoad ()
    turtle.turnLeft()
    repeat
        sleep(0.5)
    until turtle.dig() == false or turtle.detect() == false
    turtle.forward()
    repeat
        sleep(0.5)
    until turtle.digUp() == false or turtle.detectUp() == false
    turtle.back()
    turtle.select(3)
    turtle.place()
    for slot = 5,16,1 do
        turtle.select(slot)
        turtle.drop()
    end
    turtle.select(5)
    turtle.turnRight()
end


function moveOneBlock (i)
    repeat
        sleep(0.5)
    until turtle.dig() == false or turtle.detect() == false
    repeat
        sleep(0.5)
    until turtle.digUp() == false or turtle.detectUp() == false
    turtle.select(2)
    turtle.placeDown()
    if i%13 == 0 then
        placeTorch()
    end
end


function checkMaterials()
    for slot = 1,4,1 do
        if turtle.getItemCount(slot) == 0 then
            print("Out of materials")
            exit()
        end
    end
end


function mineTunnel (length)
    i = 1
    while i < length do
        moveOneBlock(i)
        if turtle.getFuelLevel() == 0 then
            turtle.select(1)
            turtle.refuel(1)
        end
        if turtle.getItemCount(16) > 0 then
            offLoad()
        end
    if turtle.forward() then
            i = i+1
        end
        checkMaterials()
    end
end


function makeMine (x,y)
    -- digs a tunnel x blocks, moves over y blocks, and digs a tunnel back.
    mineTunnel(x)
    placeTorch()
    turtle.turnLeft()

    mineTunnel(y)
    placeTorch()
    turtle.turnLeft()

    mineTunnel(x)
    placeTorch()
    turtle.turnRight()

    mineTunnel(y)
    placeTorch()
    turtle.turnRight()
end


while true do
    makeMine(50,4)
end