pathfinder

print("Input turtle X coord")
xCoord = read()
xCoord = tonumber(xCoord)
print("Input turtle Y coord")
yCoord = read()
yCoord = tonumber(yCoord)
print("Input turtle Z coord")
zCoord = read()
zCoord = tonumber(zCoord)
print("Input turtle direction NSEW")
facing = read()

function stepForwards(int)
    local i = 0
    repeat
        if turtle.forward() then
            i = i + 1
            if facing == "N" then
                zCoord = zCoord - 1
            elseif facing == "E" then
                xCoord = xCoord + 1
            elseif facing == "S" then
                zCoord = zCoord + 1
            elseif facing == "W" then
                xCoord = xCoord - 1
            end
        else
            turtle.attack()
            turtle.dig()
        end
    until i == int

end

function stepDown(int)
    local i = 0
    repeat
        if turtle.down() then
            i = i + 1
            yCoord = yCoord - 1
        else
            turtle.attackDown()
            turtle.digDown()
        end
    until i == int
end

function stepUp(int)
    local i = 0
    repeat
        if turtle.up() then
            i = i + 1
            yCoord = yCoord + 1
        else
            turtle.attackUp()
            turtle.digUp()
        end
    until i == int
end

function rotateNorth()
    if facing == "N" then
        facing = "N"
        return true
    elseif facing == "E" then
        facing = "N"
        turtle.turnLeft()
        return true
    elseif facing == "S" then
        facing = "N"
        turtle.turnLeft()
        turtle.turnLeft()
        return true
    elseif facing == "W" then
        facing = "N"
        turtle.turnRight()
        return true
    end
end

function rotateEast()
    if facing == "N" then
        facing = "E"
        turtle.turnRight()
        return true
    elseif facing == "E" then
        facing = "E"
        return true
    elseif facing == "S" then
        facing = "E"
        turtle.turnLeft()
        return true
    elseif facing == "W" then
        facing = "E"
        turtle.turnRight()
        turtle.turnRight()
        return true
    end
end

function rotateSouth()
    if facing == "N" then
        facing = "S"
        turtle.turnLeft()
        turtle.turnLeft()
        return true
    elseif facing == "E" then
        facing = "S"
        turtle.turnRight()
        return true
    elseif facing == "S" then
        facing = "S"
        return true
    elseif facing == "W" then
        facing = "S"
        turtle.turnLeft()
        return true
    end
end
function rotateWest()
    if facing == "N" then
        facing = "W"
        turtle.turnLeft()
        return true
    elseif facing == "E" then
        facing = "W"
        turtle.turnRight()
        turtle.turnRight()
        return true
    elseif facing == "S" then
    facing = "W"
        turtle.turnRight()
        return true
    elseif facing == "W" then
        facing = "W"
        return true
    end
end

while true do
    print("input targetX")
    targetX = read()
    targetX = tonumber(targetX)
    print("input targetY")
    targetY = read()
    targetY = tonumber(targetY)
    print("input targetZ")
    targetZ = read()
    targetZ = tonumber(targetZ)

    if xCoord < targetX then
        rotateEast()
        stepForwards(targetX - xCoord)
    elseif xCoord > targetX then
        rotateWest()
        stepForwards(xCoord - targetX)
    end
    if yCoord > targetY then
        stepDown(yCoord - targetY)
    elseif yCoord < targetY then
        stepUp(targetY - yCoord)
    end
    if zCoord > targetZ then
        rotateNorth()
        stepForwards(zCoord - targetZ)
    elseif zCoord < targetZ then
        rotateSouth()
        stepForwards(targetZ - zCoord)
    end
end