stripmine

-- This prepares a 2 x 3 tunnel for strip mining

-- Check if the turtle has enough torches in slot 1
if turtle.getItemDetail(1)["name"] ~= "minecraft:torch" then
    print("Please place torches in slot 1 and try again")
    return
end

if turtle.getItemCount(1) < 64 then
    print("Please place 64 torches in slot 1 and try again")
    return
end

if turtle.getFuelLevel() < 1123 then
    print("Please refuel to 1123 and try again")
    return
end

-- Functions

local fwd = function ()
    while not turtle.forward() do
        turtle.dig()
    end
    turtle.digUp()
    turtle.digDown()
end

local function branchFwd()
    while not turtle.forward() do
        turtle.dig()
    end
end

local function branch() -- Digs one branch and returns to starting position
    turtle.turnLeft()
    for i = 1, 5 do
        branchFwd()
        turtle.digDown()
    end
    for i = 1, 5 do
        turtle.back()
    end
    turtle.turnRight()
end


-- Dig out the main tunnel

fwd() -- First column of tunnel
for i = 0, 124 do
    fwd()
end
turtle.turnRight()
fwd()
turtle.turnRight()
for i = 0, 124 do
    fwd()
end

-- Place torches
turtle.select(1) -- Select the torches

turtle.turnRight() -- Get back to starting position
fwd()
turtle.turnRight()

turtle.placeUp() -- Place first torch

for i = 0, 124 do
    if i % 4 == 0 then
        turtle.placeUp()
        if i ~= 0 then
            branch()
        end
    end
    if i ~= 124 then
        fwd()
    end
end

turtle.turnRight()
fwd()
turtle.turnRight()

turtle.placeUp()

for i = 0, 124 do
    if i % 4 == 0 then
        turtle.placeUp()
        if i ~= 124 then
            branch()
        end
    end
    fwd()
end