blockgame/mods/bg_funnel/recipe.lua

local modname = minetest.get_current_modname()

blockgame.crafting.register_pummel_recipe({
	label = "pummel logs into funnel",
	used_item = "woodworking:plank",
	target_node = "bg_tree:log",
	check = function (pos, used_node, target_node)
		local below = pos + blockgame.vector.dirs.down
		return minetest.get_node(below).name == "bg_tree:log"
	end,
	on_success = function (pos, used_node, target_node)
		local below = pos + blockgame.vector.dirs.down
		minetest.remove_node(pos)
		minetest.set_node(below, {name = modname .. ":funnel"})
	end,
})