falling_light/staves.lua

-- Staff of X (based on Staff of Light by Xanthin)

minetest.register_tool("vivarium:staff_clone", { -- this will be the floor staff
	description = "Floor Master Staff (extend nodes horzontally from above, side or below)",
	inventory_image = "water_staff.png^[colorize:green:130",
	wield_image = "water_staff.png^[colorize:green:130",
	range = 5,
	stack_max = 1,
	on_use = function(itemstack, user, pointed_thing)

		if pointed_thing.type ~= "node" then
			print ("Not a node")
			return
		end

		local pos = pointed_thing.under
		local pname = user:get_player_name()

		if minetest.is_protected(pos, pname) then
			minetest.record_protection_violation(pos, pname)
			print ("Protection violation")
			return
		end


		local breadth = 2 -- full square is 2*breadth+1 on side
		local targetnode = minetest.get_node(pos).name
		local userpos = user:getpos()
		local relpos = 0
		if (userpos.y - pos.y)^2 > 2 then -- if clearly above/below
			relpos = (userpos.y - pos.y)/math.sqrt((userpos.y - pos.y)^2)
		end
                local airnodes = minetest.find_nodes_in_area(
                        {x = pos.x - breadth, y = pos.y+relpos, z = pos.z - breadth},
                        {x = pos.x + breadth, y = pos.y+relpos, z = pos.z + breadth},
                        {"air"}
		)

                for _,fpos in pairs(airnodes) do
			minetest.swap_node(fpos, {name = targetnode })
		end
		return itemstack

	end,
})

-- quick and dirty tool to repair carnage caused by NSSM ice mobs
minetest.register_tool("vivarium:staff_melt", {
	description = "Staff of Melting (replace snow/ice with node under it, or above it)",
	inventory_image = "water_staff.png^[colorize:blue:130",
	wield_image = "water_staff.png^[colorize:blue:130",
	range = 12,
	stack_max = 1,
	on_use = function(itemstack, user, pointed_thing)

		if pointed_thing.type ~= "node" then
			return
		end

		local pos = pointed_thing.under
		local pname = user:get_player_name()

		if minetest.is_protected(pos, pname) then
			minetest.record_protection_violation(pos, pname)
			return
		end


		local breadth = 2 -- full square is 2*breadth+1 on side
                local frost = minetest.find_nodes_in_area(
                        {x = pos.x - breadth, y = pos.y, z = pos.z - breadth},
                        {x = pos.x + breadth, y = pos.y, z = pos.z + breadth},
                        {"default:ice","default:snowblock"}
		)

                for _,fpos in pairs(frost) do
				local replname = minetest.get_node({x=fpos.x,y=fpos.y-1,z=fpos.z}).name
				if replname == "default:ice" or replname == "default:snowblock" then
					replname = minetest.get_node({x=fpos.x,y=fpos.y+1,z=fpos.z}).name
				end
				-- future: if replname == air, then get average node around  that is not air, use that
				if fpos.y > 0 and fpos.y < 3 and replname == "default:water_source" then
					replname = "air"
				end
				minetest.swap_node(fpos, {name = replname })
		end
		return itemstack

	end,
})

minetest.register_alias("vivarium:water_staff","vivarium:staff_melt")