turtleTurn

-- move program by Caio "Jabulba" Jabulka 2015
-- Turtle type: Mining Turtle
-- Purpose: Turtle moves the specified amount of times forward.
-- Licensed MIT

local enderChestId = "EnderStorage:enderChest"
local inventoryEmptiedCount = 0
local args = {...}
args[1] = tonumber(args[1]) or 1
assert(type(args[1]) == "number", "Expected at most one argument as number.")
if not(args[2] == "l" or args[2] == "r" or args[2] == "left" or args[2] == "right") then
    args[1] = 0
    error("Provided direction " .. args[2] .. " is invalid. Try 'l' or 'r'")
end

local function checkFuel()
    local fuelLevel = turtle.getFuelLevel()
    if fuelLevel < 5 then
        print("CRITICAL: FUEL LEVEL CRITICAL.")
        print("EMERGENCY REFUELING INITIATED.")
        for slot = 1, 16, 1 do
            if turtle.refuel() then
                break
            end
        end
    elseif fuelLevel < 25 then
        print("CRITICAL: FUEL LEVEL EXTREMELY LOW.")
    elseif fuelLevel < 500 then
        print("WARNING: FUEL LEVEL LOW.")
    end
end

local function turtleTurn(direction, attempts)
    direction = direction or "left"
    attempts = attempts or 1

    checkFuel()

    if attempts > 30 then
        return false
    end

    if direction == "l" or direction == "left" then
        if not turtle.turnLeft() then
            turtleTurn("f", attempts)
        end
    elseif direction == "r" or direction == "right" then
        if not turtle.turnRight() then
            turtle.attackDown()
            turtleTurn("d", attempts)
        end
    end

    return true
end

for runs = 1, args[1], 1 do
    turtleTurn(args[2])
end