App

-- https://turtleappstore.com/u/UltraBob/a/patrol
os.loadAPI('hare')
os.loadAPI('bobdule')
debug=false

-- Attack and keep attacking as long as you are hitting
function getEm()
    while turtle.attack() or turtle.attackUp() or turtle.attackDown() do
        bobdule.debug("hit something, I'm gonna keep going.", debug)
    end
end

function isFuzzyBlock(name)
    result, block = turtle.inspect()
    if result and string.match(block['name'], name) then
        return true
    else
        return false
    end
end

function isDirection(direction)
    if direction ~= "left" and direction ~= "right" then
        return false
    end
    return true
end

function turnToward(direction)
    if not isDirection(direction) then
        error("invalid direction: ", direction)
    end
    if direction == "right" then
        turtle.turnRight()
    else
        turtle.turnLeft()
    end
end

function turnAway(direction)
    if not isDirection(direction) then
        error("Invalid direction; ", direction)
    end
    if direction == "right" then
        turtle.turnLeft()
    else
        turtle.turnRight()
    end
end

function swapDirections(direction)
    print("Swapping ", direction)
    if not isDirection(direction) then error("invalid direction: ", direction) end
    if direction == "right" then
        print("returning left")
        return "left"
    else
        print("returning right")
        return "right"
    end
end

function proceed(fenceDir)
    if isFuzzyBlock('fence') then
        print("I've hit a fence, what should I do?")
        return false
    else
        getEm()
        if turtle.forward() then
            bobdule.findFirstSlotandGrab()
            getEm()
            return true
        else
            -- turtle has hit something.  what is it?
            if isFuzzyBlock('fence') then
                turnToward(fenceDir)
                if isFuzzyBlock("fence") then
                    turnToward(fenceDir)
                    print("I've come to the end and turned around my friend")
                    return true
                elseif turtle.inspect() then
                    print("Turned the corner")
                    return true
                else
                    error("I don't know what situation I'm in Mummy!")
                end
            else -- not a fence
                bobdule.debug("I hit something besides a fence, and turned.")
                turnToward(fenceDir)
                return true
            end
            end
        return true
    end
end

function fuzzyFindBlock(name)
    local result, block

    for i = 1, 4 do
        if isFuzzyBlock(name) then
            print('Found ', name, 'in front of me.  Returning')
            return true
        end
        print("Turning right")
        turtle.turnRight()
    end
    print("returning false")
    return false
end

-- init make sure I'm next to a fence, then turn so the fence is to my right
function init()
    if fuzzyFindBlock('fence') then
        print("fence should be in front of me")
        turtle.turnLeft()
        return true
    else
        print("no fence found")
        return false
    end
end

function timeToNight()
    time = os.time()
    print("time: ", time)
    if time < 6.0 or time > 18.541 then
        bobdule.debug("It is already night", debug)
        return true
    else
        timeLeft = 18.541 - time
        secondsLeft = timeLeft * 50
        return false, math.ceil(secondsLeft)
    end
end

if init() then
    print("can start moving now")
    local direction = "right"
    local walking = true
    while true do
        if walking == true then
            night, secondsLeft = timeToNight()
            print("night: ", night)
            print("secondsLeft: ", secondsLeft)
            if not night then
                print("Waiting ", secondsLeft, " seconds for night.  See you then!")
                sleep(secondsLeft)
            else
                walking = proceed(direction)
            end
        else
            turnAway(direction)
            turnAway(direction)
            print("I turned ", direction, " twice, and now am I facing in the right direction?")
            direction = swapDirections(direction)
            print("Now I think the fence is on my ", direction)
            walking = true
        end
    end
end