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private fun findHoppersAndChests(block: Block,
                                 lambda: (Set<Hopper>, Set<Chest>) -> Unit,
                                 hoppers: HashSet<Hopper> = hashSetOf(block.state.data as Hopper),
                                 chests: HashSet<Chest> = hashSetOf()) {
    when (block.type) {
        Material.HOPPER -> {
            val hopper = block.state.data as org.bukkit.material.Hopper
            val relative = block.getRelative(hopper.facing)

            if (relative.type == Material.CHEST || relative.type == Material.TRAPPED_CHEST) {

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/**
 * Converts a [BlockFace] to a yaw value.
 */
private fun faceToYaw(face: BlockFace): Float {
    return when (face) {
        BlockFace.NORTH -> 180.0F
        BlockFace.NORTH_NORTH_EAST -> 202.5F
        BlockFace.NORTH_EAST -> 225.0F
        BlockFace.EAST_NORTH_EAST -> 247.5F
        BlockFace.EAST -> 270.0F

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/**
 * Tries to find the most probable ground level for a given [point].
 */
private fun findGroundLevel(point: Point3D): Int {
    for (y in 0..5) {
        // path visualization is always going to be down
        val block = startLoc.world.getBlockAt(point.x, point.y - y, point.z)

        // don't put block updates in the air
        if (NON_SOLID_BLOCKS.contains(block.type.id.toByte())) {

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// hijack logging filter to suppress the server's complaints about commands being dispatched async
Bukkit.getLogger().setFilter {
    return@setFilter !it.message.contains("Command Dispatched Async")
}