Epic/mods/caverealms_lite/abms.lua

minetest.register_abm({
   label = 'Firevine Growth/Spread',
   nodenames = {'caverealms:fire_vine'},
   neighbors = {'group:stone'},
   interval = 53,
   chance = 25,
   action = function(pos)
      local node_below = ({x=pos.x, y=pos.y-1, z=pos.z})
      local below_name = minetest.get_node(node_below).name
      local spread_chance = math.random(0,3)
      if spread_chance < 2 then
         if below_name ~= 'caverealms:fire_vine' or 'air' then
            local ran_num = math.random(1,4)
            local location = {}
            if ran_num == 1 then
               location = {x=pos.x+1, y=pos.y, z=pos.z}
            elseif ran_num == 2 then
               location = {x=pos.x-1, y=pos.y, z=pos.z}
            elseif ran_num == 3 then
               location = {x=pos.x, y=pos.y, z=pos.z+1}
            elseif ran_num == 4 then
               location = {x=pos.x, y=pos.y, z=pos.z-1}
            end
            local below_location = ({x=location.x, y=location.y-1, z=location.z})
            local below_location_node = minetest.get_node(below_location).name
            if below_location_node ~= 'air' then
               local location_node = minetest.get_node(location)
               local location_name = location_node.name
               if location_name == 'air' or minetest.get_item_group(location_name, 'flammable') > 0 then
                  minetest.set_node(location, {name = 'caverealms:fire_vine'})
               end
            end
            if below_name == 'air' then
               minetest.remove_node(pos)
            end
         end
      else
         local above_pos = {x=pos.x, y=pos.y+1, z=pos.z}
         local above_node = minetest.get_node(above_pos).name
         while above_node == 'caverealms:fire_vine' do
            above_pos.y = above_pos.y + 1
            above_node = minetest.get_node(above_pos).name
         end
         if minetest.get_item_group(above_node, 'flammable') > 0 or above_node == 'air' then
            minetest.set_node(above_pos, {name = 'caverealms:fire_vine'})
         end
      end
   end
})