init

init.lua

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+-- Wieldlight for mineclonia
+-- supports mcl_offhand
+-- License GPL3
+-- cora, 2023
+
+local UPDATE_INTERVAL = 1
+local placed_lights = {}
+local next_update = 0
+
+for i=2,minetest.LIGHT_MAX do
+	minetest.register_node("mcl_wieldlight:light_"..i,{
+		drawtype = "airlike",
+		walkable = false,
+		pointable = false,
+		buildable_to = true,
+		drop = "",
+		light_source = i,
+		groups = { wieldlight = i },
+	})
+end
+
+local function update_player_light(pl)
+	local wield = pl:get_wielded_item():get_name()
+	local offhand = mcl_offhand.get_offhand(pl):get_name()
+	local wl = minetest.registered_items[wield] and minetest.registered_items[wield].light_source or 0
+	local ol = minetest.registered_items[offhand] and minetest.registered_items[offhand].light_source or 0
+	local light = math.min(math.max(wl,ol,0),minetest.LIGHT_MAX)
+	local p = vector.round(vector.offset(pl:get_pos(),0,1,0))
+	local ph = minetest.hash_node_position(p)
+	local n = minetest.get_node(p)
+	local has_light = false
+	local rm = {}
+	for h,v in pairs(placed_lights[pl] or {}) do
+		if light < 2 or ph ~= h then
+			table.insert(rm,v)
+			placed_lights[pl][h] = nil
+		else
+			has_light = true
+		end
+	end
+
+	if light >= 2 and not has_light and n.name == "air" then
+		if not placed_lights[pl] then placed_lights[pl] = {} end
+		minetest.set_node(p,{name="mcl_wieldlight:light_"..light})
+		placed_lights[pl][ph] = p
+	end
+
+	minetest.bulk_set_node(rm,{name="air"}) --removal last otherwise you get flickering (and not nice flickering)
+end
+
+minetest.register_globalstep(function(dtime)
+	next_update = next_update - dtime
+	if next_update > 0 then return end
+
+	for _,pl in pairs(minetest.get_connected_players()) do
+		update_player_light(pl)
+	end
+	next_update = UPDATE_INTERVAL
+end)
+
+minetest.register_on_leaveplayer(function(pl)
+	for h,v in pairs(placed_lights[pl]) do
+		minetest.remove_node(v)
+	end
+	placed_lights[pl] = nil
+end)
+
+minetest.register_lbm({
+	label = "Remove oprphan wieldlights",
+	name = "mcl_wieldlight:remove_orphan_lights",
+	nodenames = {"group:wieldlight"},
+	run_at_every_load = true,
+	action = minetest.remove_node,
+})
+
+minetest.register_on_mods_loaded(function()
+	for k,v in pairs(minetest.registered_items) do
+		if v.light_source and v.light_source >= 2 then --allow all light emitting items as offhand nodes
+			minetest.override_item(k,{
+				groups = table.update({offhand_item = 1},v.groups)
+				--use "reverse arg" table.update instead of the preferred table.merge to support legacy mcl2
+			})
+		end
+	end
+end)

mod.conf

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+name = mcl_wieldlight
+author = cora
+depends = mcl_offhand