Detects when a player interacts with air, regardless of what block they're standing on.

player-interact-air.zs

import crafttweaker.event.PlayerInteractEvent;
import crafttweaker.event.PlayerInteractBlockEvent;
import crafttweaker.event.PlayerInteractEntityEvent;
import crafttweaker.event.EntityLivingUseItemEvent.Start;
import crafttweaker.entity.IEntityLiving;
import crafttweaker.entity.IEntityEquipmentSlot as slots;
import crafttweaker.server.IServer;
import crafttweaker.block.IBlock;
import crafttweaker.entity.IEntity;
import crafttweaker.world.IFacing;
/* import crafttweaker.command.ICommand; */
import crafttweaker.command.ICommandSender;
import mods.ctutils.utils.Math;
import crafttweaker.event.PlayerUseHoeEvent;
import crafttweaker.entity.IEntityLivingBase;
import crafttweaker.world.IBlockPos;
import mods.contenttweaker.BlockState;
import scripts.player_interact_statics as stats;

events.onPlayerInteract(function(event as PlayerInteractEvent)
{
  if (event.player.world.isRemote()) { return; }
  print("player interact");
  /* print("Start is PlayerInteractBlockEvent: "~((event instanceof PlayerInteractBlockEvent) as string));
  print("Start is PlayerInteractEntityEvent: "~((event instanceof PlayerInteractEntityEvent) as string)); */

  /* print("useBlock: "~event.useBlock);
  print("useItem: "~event.useItem); */
  /* print("item: "~event.item.definition.id); */
  print("current item: "~event.player.currentItem.definition.id);


  print("event block: "~event.block.definition.id);
  print("player blockPos y-1 block: "~event.player.world.getBlock((event.player as IEntity).position.getOffset(IFacing.down(), 1)).definition.id);
  print("event pos: "~event.x~", "~event.y~", "~event.z);
  print("player pos: "~(event.player as IEntity).position.x~", "~(event.player as IEntity).position.y~", "~(event.player as IEntity).position.z);
  /* print("event pos block: "~event.player.world.getBlock(event.position).definition.id); */

  /* print("event.block == event.world.getBlock y-1 ?: "~((([event.block] as IBlock []) has event.world.getBlock((event.player as IEntity).position.getOffset(IFacing.down(), 1))) as string)); */

  if (event.player.currentItem.definition.id == <minecraft:fire_charge>.definition.id)// &&
  {
    print("fire charge used!");
    if (event.block.definition.id == <block:minecraft:air>.getBlock().definition.id)// ||
    {
      print("fire charge used on air");
      server.commandManager.executeCommand(event.player, "summon small_fireball "~(event.player.x as string)~" "~(event.player.y+3 as string)~" "~(event.player.z as string)~" {direction:[0.0,0.0,0.0],power:[0.1,0.0, 0.0]}");
    }
    else
    {
      print("fire charge not used on air");
      /* if (([event.position] as IBlockPos []) has (event.player as IEntity).position) */
      if((event.x == (event.player as IEntity).position.x) &&
        (event.y == Math.floor(event.player.y)) && 
        (event.z == (event.player as IEntity).position.z))
      {
        print("fire charge used and pos's match");
        server.commandManager.executeCommand(event.player, "summon small_fireball "~(event.player.x as string)~" "~(event.player.y+3 as string)~" "~(event.player.z as string)~" {direction:[0.0,0.0,0.0],power:[0.1,0.0, 0.0]}");

      }
    }
  }
});


/* val direction  as
eyeHeight
heldEquipment
rotationYaw
rotationPitch
lookingDirection */