Simple Tunneling Program – Nullharp's Blog

The objective of our program is to make the turtle dig a tunnel of a specified length (passed as a command-line argument) and then return to the starting position. We will use a refueling function to ensure the turtle has enough fuel to complete the task.

Step 1: Writing the Program

Create a new program on your ComputerCraft computer and give it a name, for example, “tunneling_program.lua”.

				
					-- Step 1.1: Read the command-line argument (length)
local length = ...

-- Step 1.2: Function to refuel the turtle to a specific level
local function refuelToLevel(level)
    -- ... (code for refueling, see original program)
end

-- Step 1.3: Function to dig and move forward
local function digAndMove()
    -- ... (code for digging and moving forward, see original program)
end

-- Step 1.4: Function to return the turtle to the starting position
local function returnToStart(length)
    -- ... (code for returning to the starting position, see original program)
end

-- Step 1.5: Main program
local function main()
    -- ... (code for the main program, see original program)
end

-- Step 1.6: Call the main function with the given length
main()

Step 2: Implementing the Refuel Function

In this step, we’ll implement the refuel function to ensure the turtle has enough fuel to complete the tunneling task.

				
					-- Step 2.1: Read the command-line argument (length) 
local length = ... 
-- Step 2.2: Function to refuel the turtle to a specific level 
local function refuelToLevel(level) 
    while turtle.getFuelLevel() < level do 
        turtle.select(1) 
        -- Assuming fuel items are in slot 1 
        turtle.refuel() 
        sleep(0.25) 
    end 
end 
-- Step 2.3: ... (rest of the code from previous steps)

Step 3: Implementing the digAndMove Function

In this step, we’ll implement the digAndMove function, which will make the turtle dig and move forward until it completes the specified tunnel length.

				
					-- Step 3.1: Read the command-line argument (length) 
local length = ...
-- Step 3.2: Function to refuel the turtle to a specific level 
local function refuelToLevel(level) 
    -- ... (code for refueling, see Step 4) 
end 
-- Step 3.3: Function to dig and move forward 
local function digAndMove() 
    while not turtle.forward() do 
        if turtle.detect() then 
            turtle.dig() 
        else
            sleep(0.5) 
            -- Wait for something to move out of the way
        end
    end 
    turtle.digUp()
end 
-- Step 3.4: ... (rest of the code from previous steps)

Step 4: Implementing the returnToStart Function

In this step, we’ll implement the returnToStart function, which will make the turtle return to the starting position after completing the tunnel.

				
					-- Step 4.1: Read the command-line argument (length) 
local length = ... 
-- Step 4.2: Function to refuel the turtle to a specific level
local function refuelToLevel(level) 
-- ... (code for refueling, see Step 2) 
end 
-- Step 4.3: Function to dig and move forward 
local function digAndMove() 
-- ... (code for digging and moving forward, see Step 5) 
end 
-- Step 4.4: Function to return the turtle to the starting position 
local function returnToStart(length) 
    turtle.turnLeft() 
    turtle.turnLeft() 
    for i=1, length do 
        while not turtle.forward() do
            turtle.dig() 
            sleep(0.5) 
            -- Wait for something to move out of the way 
        end
    end 
    turtle.turnLeft() 
    turtle.turnLeft() 
end 
-- Step 4.5: ... (rest of the code from previous steps)

Step 5: Implementing the Main Function
In this step, we’ll implement the main function, which will be the entry point of our program.

				
					-- Step 5.1: Read the command-line argument (length)
local length = ...

-- Step 5.2: Function to refuel the turtle to a specific level
local function refuelToLevel(level)
    -- ... (code for refueling, see Step 2)
end

-- Step 5.3: Function to dig and move forward
local function digAndMove()
    -- ... (code for digging and moving forward, see Step 3)
end

-- Step 5.4: Function to return the turtle to the starting position
local function returnToStart(length)
    -- ... (code for returning to the starting position, see Step 4)
end

-- Step 5.5: Main program
local function main()
    -- Check if we have enough fuel to complete the task
    local fuelNeeded = length * 2
    refuelToLevel(fuelNeeded)

    -- Dig and move forward 'length' times
    for i=1, length do
        digAndMove()
    end

    -- Return to the starting position
    returnToStart(length)
end

-- Step 5.6: Call the main function with the given length
main()

Step 1: Writing the Program

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