moreblocks/sweeper.lua

local S = moreblocks.intllib
local check_protection = moreblocks.check_protection
local sweepables = {}

--
-- functional sweeper
--
minetest.register_craftitem("moreblocks:sweeper", {
	description = S("Sweeper"),
	inventory_image = "moreblocks_sweeper.png",
	on_use = function(itemstack, user, pointed_thing)
		if pointed_thing.type ~= "node" then
			-- do nothing if it's not a node
			return
		end

		local node = minetest.get_node(pointed_thing.under)
		local ndef = minetest.registered_nodes[node.name]
		local sweepable = sweepables[node.name] or (ndef and ndef.on_sweep)

		if not sweepable then
			return
		end

		if check_protection(pointed_thing.under, user and user:get_player_name(), "sweeper", "sweep " .. node.name) then
			return
		end

		sweepable(pointed_thing.under, node)
	end
})

--
-- register sweepable node handler
--
function moreblocks.register_sweepable(node_name, callback)
	sweepables[node_name] = callback
end

--
-- default on_sweep handler factory
--
function moreblocks.on_sweep_default(clean_node, sweeps_to_clean)
	if nil == sweeps_to_clean then
		sweeps_to_clean = 3
	end

	return function (pos, node)
		local meta = minetest.get_meta(pos)
		local sweeps = meta:get_int('sweeps') + 1
	
		-- hit x times to clean
		if sweeps >= sweeps_to_clean then
			-- set clean node
			meta:set_int('sweeps', 0)
			minetest.swap_node(pos, { name = clean_node })
			return true
		end
	
		meta:set_int('sweeps', sweeps)
	
		return false
	end
end


------------------------------------
-- DEMO CODE                      --
-- TODO: REMOVE AFTER TESTING     --
-- Sweepable mossycobble example: --

-- use register_sweepable function
moreblocks.register_sweepable("default:mossycobble", moreblocks.on_sweep_default('default:cobble'))

-- or use on_sweep when registering node
--[[ 
minetest.register_node("default:mossycobble", {
	description = S("Mossy Cobblestone"),
	tiles = {"default_mossycobble.png"},
	is_ground_content = false,
	groups = {cracky = 3, stone = 1},
	sounds = default.node_sound_stone_defaults(),

	on_sweep = moreblocks.on_sweep_default('default:cobble'),
})
]]

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