CC Turtle: Digger (3Wx1H) v0.2

local args = { ... }

local fl = turtle.getFuelLevel()
local dumpinventory = false

if #args < 1 then
    print("Usage: digger3Wx1H <length> [dump inventory when done (true|false)]")
    return
end

local length = tonumber( args[1] )

if #args == 2 then
    dumpinventory = args[2]
end

if length < 1 then
    print("Error: Length must be at least 1")
    return
end

if fl < ((length - 1) * 2) then
    print("Error: Not enough fuel to complete the action (need at least " .. ((length - 1) * 2) .. ")")
    return
end

local posX = 0
local distanceTraveled = 0
local numBlocks = 0
local numAttacks = 0


-- Dig the block in front of the turtle until no block is detected anymore
function digUntilClear()
    -- If there is a block in front, dig it. Loop in case of falling sand/gravel.
    while turtle.detect() == true do
        if turtle.dig() == true then
            numBlocks = numBlocks + 1
        else
            print("Error: Could not dig the block! Aborting...")
            return false
        end
        sleep(0.5)
    end

    return true
end


-- Attack as long as the attack succeeds (= mobs in front)
function attackUntilClear()
    local tmp1 = 0

    -- Attack if there are mobs in front of the turtle
    while turtle.attack() == true do
        numAttacks = numAttacks + 1
        -- Failsafe limit
        tmp1 = tmp1 + 1
        if tmp1 > 100 then
            print("Error: Hit the failsafe limit (100) of attacks!")
            return false
        end
    end

    return true
end

-- Move forward one block
function moveForward()
    local tmp2 = 0

    -- Attack while we can't move forward (because someONE is blocking us)
    while turtle.forward() == false do
        if attackUntilClear() == false then
            return false
        end

        -- Failsafe limit
        tmp2 = tmp2 + 1
        if tmp2 > 100 then
            print("Error: Hit the failsafe limit (100) of trying to move")
            return false
        end
    end

    return true
end


-- Dig a 3 wide area and move forward
function digAndMoveForward3W(fw)
    -- Dig the block in front
    if digUntilClear() == false then
        return false
    end

    -- Move to the digged spot
    if moveForward() == false then
        return false
    end

    -- Dig the blocks that are to the left and to the right
    turtle.turnLeft()
    if digUntilClear() == false then
        return false
    end

    turtle.turnRight()
    turtle.turnRight()
    if digUntilClear() == false then
        return false
    end

    if fw == true then
        -- Turn back to the forward direction
        turtle.turnLeft()
    else
        -- Turn around (= backwards)
        turtle.turnRight()
    end

    return true
end


-- (Dig and) move forward in a straight line (used for the return trip)
function digAndMoveForward1W()
    if digUntilClear() == false then
        return false
    end

    if moveForward() == false then
        return false
    end

    return true
end

-- Select the first slot so that the items get filled to the inventory starting from the first slot
turtle.select(1)


-- Dig and move forward for every block except the last one
for i = 1, (length - 1) do
    if digAndMoveForward3W(true) == false then
        break
    end

    posX = posX + 1
    distanceTraveled = distanceTraveled + 1
end


-- After the last row of blocks, we orient backwards for the return trip
if digAndMoveForward3W(false) == true then
    posX = posX + 1
    distanceTraveled = distanceTraveled + 1
end


-- Return back to the starting position
for i = 1, posX do
    if digAndMoveForward1W() == false then
        print("Error: Got stuck at distance " .. distanceTraveled)
        print("  blocks from start position while returning.")
        return
    end
    posX = posX - 1
    distanceTraveled = distanceTraveled + 1
end

if dumpinventory == "true" then
    -- If there is a block behind the starting position, assume it is a chest
    -- and dump the inventory to it.
    if turtle.detect() then
        for i = 1, 16 do
            turtle.select(i)
            turtle.drop()
--          if turtle.drop() == false then
--              break
--          end
        end
    end
end

-- And finally reorient
turtle.turnRight()
turtle.turnRight()

-- And print a summary
print("Done.")
print("Mined " .. numBlocks .. " blocks.")
print("Moved a total of " .. distanceTraveled .. " blocks.")
print("Attacked mobs " .. numAttacks .. " times.")