Wither_builder

rednet.open("right")

xH = -175
yH = 15
zH = 539
homeFace = 1

function compass()
    x,y,z = gps.locate()
    while turtle.forward() == false do
        turtle.turnRight()
    end
    x1,y1,z1 = gps.locate()
    direction = {x = x - x1, y = y - y1, z = z - z1}
    for k,v in pairs( direction ) do
        if k == "x" and v == 1 then
            facing = 1 -- west
        elseif k == "x" and v == -1 then
            facing = 3 -- east
        elseif k == "z" and v == 1 then
            facing = 2 -- north
        elseif k == "z" and v == -1 then
            facing = 0 -- south
        end
    end
    turtle.back()
    return facing
end

function goHome()
while true do
    xL,yL,zL = gps.locate()
    print(yL)
    print(yH)
    x = xL - xH
    y = yL - yH
    z = zL - zH
    if y > 0 then
        turtle.down()
    elseif y < 0 then
        turtle.up()
    elseif z < 0 then
        currentDir = compass()
        if currentDir ~= 0 then
            turnTo(0)
        end
        while turtle.forward() == false do
            turtle.select(4)
            turtle.dig()
            turtle.forward()
            turtle.forward()
            turtle.turnRight()
            turtle.turnRight()
            turtle.place()
            turtle.turnRight()
            turtle.turnRight()
        end
    elseif z > 0 then
        currentDir = compass()
        if currentDir ~= 2 then
            turnTo(2)
        end
        while turtle.forward() == false do
            turtle.select(4)
            turtle.dig()
            turtle.forward()
            turtle.forward()
            turtle.turnRight()
            turtle.turnRight()
            turtle.place()
            turtle.turnRight()
            turtle.turnRight()
        end
    elseif x < 0 then
        currentDir = compass()
        if currentDir ~= 3 then
            turnTo(3)
        end
        while turtle.forward() == false do
            turtle.select(4)
            turtle.dig()
            turtle.forward()
            turtle.forward()
            turtle.turnRight()
            turtle.turnRight()
            turtle.place()
            turtle.turnRight()
            turtle.turnRight()
        end
    elseif x > 0 then
        currentDir = compass()
        if currentDir ~= 1 then
            turnTo(1)
        end
        while turtle.forward() == false do
            turtle.select(4)
            turtle.dig()
            turtle.forward()
            turtle.forward()
            turtle.turnRight()
            turtle.turnRight()
            turtle.place()
            turtle.turnRight()
            turtle.turnRight()
        end
    else
        break
    end
end
end


function turnTo(Int)
    if facing ~= Int then
        local current = facing - Int
        if current < 0 then
            for i = 1, math.abs(current) do
                turtle.turnRight()
            end
        else
            for i = 1,current do
            turtle.turnLeft()
            end
        end
    end
end

goHome()
compass()
turnTo(homeFace)
while true do
  event, p1, p2 = os.pullEvent("rednet_message")
  if p1 == 33 and p2 == true then
    goHome()
    print("got home")
    compass()
    turnTo(homeFace)
    sleep(.5)
    event = os.pullEvent("redstone")
    for i = 1,2 do
      turtle.forward()
    end
    turtle.select(4)
    turtle.dig()
    turtle.forward()
    turtle.forward()
    turtle.turnRight()
    turtle.turnRight()
    turtle.place()
    turtle.turnRight()
    turtle.turnRight()
    turtle.down()
    turtle.select(1)
    turtle.place()
    turtle.up()
    turtle.turnRight()
    turtle.forward()
    turtle.turnLeft()
    turtle.place()
    for i = 1, 2 do
      turtle.turnLeft()
      turtle.forward()
      turtle.turnRight()
      turtle.place()
    end
    turtle.up()
    turtle.select(2)
    turtle.place()
    for i = 1,2 do
      turtle.turnRight()
      turtle.forward()
      turtle.turnLeft()
      turtle.place()
    end
    turtle.down()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnLeft()
    turtle.select(4)
    turtle.dig()
    turtle.forward()
    turtle.forward()
    turtle.turnRight()
    turtle.turnRight()
    turtle.place()
    turtle.turnRight()
    turtle.turnRight()
    for i = 1,4 do
      turtle.forward()
    end
    turtle.turnRight()
    turtle.turnRight()
    turtle.select(3)
    turtle.refuel(1)
    sleep(11)
  else
    sleep(0.1)
  end
end