write something there

mods/show_wielded_item/init.lua

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+-- Based on 4itemnames mod by 4aiman
+
+-- Function to determine if show item name functionality is already implemented
+local function show_already_implemented()
+	return minetest.get_modpath("unified_inventory") and true or false
+end
+
+local wield = {}
+local wieldindex = {}
+local huds = {}
+local dtimes = {}
+local dlimit = 3  -- HUD element will be hidden after this many seconds
+
+local hudbars_mod = minetest.get_modpath("hudbars")
+local unified_inventory_mod = minetest.get_modpath("unified_inventory")
+local stamina_mod = minetest.get_modpath("stamina")
+
+-- Legacy support: Name of the HUD type field for 'hud_add'.
+local hud_type_field_name
+if minetest.features.hud_def_type_field then
+	-- engine version 5.9.0 and later
+	hud_type_field_name = "type"
+else
+	-- All engine versions before 5.9.0
+	hud_type_field_name = "hud_elem_type"
+end
+
+-- Disable mod if Unified Inventory item names feature is enabled
+if unified_inventory_mod and minetest.settings:get_bool("unified_inventory_item_names") ~= false then
+	minetest.log("action", "[show_wielded_item] Unified Inventory's item names feature was detected! Running show_wielded_item is pointless now, so it won't do anything")
+	return
+end
+
+local function set_hud(player)
+	if not player:is_player() then return end
+	local player_name = player:get_player_name() 
+	-- Fixed offset in config file
+	local fixed = tonumber(minetest.settings:get("show_wielded_item_y_offset"))
+	local off
+	if fixed and fixed ~= -1 then
+		-- Manual offset
+		off = {x=0, y=-fixed}
+	else
+		-- Default offset
+		off = {x=0, y=-101}
+
+		if hudbars_mod then
+			-- Tweak offset if hudbars mod was found
+
+			local rows = math.floor((#hb.get_hudbar_identifiers()-1) / 2) + 1
+			local vmargin = tonumber(minetest.settings:get("hudbars_vmargin")) or 24
+			off.y = -76 - vmargin*rows
+		elseif stamina_mod then
+			-- Tweak offset if stamina mod was found
+			off.y = off.y - 22
+		end
+
+		-- Dirty trick to avoid collision with Luanti's status text (e.g. “Volume changed to 0%”)
+		if off.y >= -167 and off.y <= -156 then
+			off.y = -181
+		end
+	end
+
+	huds[player_name] = player:hud_add({
+		[hud_type_field_name] = "text",
+		position = {x=0.5, y=1},
+		offset = off,
+		alignment = {x=0, y=0},
+		number = 0xFFFFFF ,
+		text = "",
+		z_index = 100,
+		style = 1,
+	})
+end
+
+minetest.register_on_joinplayer(function(player)
+	set_hud(player)
+
+	local name = player:get_player_name()
+	wield[name] = player:get_wielded_item():get_name()
+	wieldindex[name] = player:get_wield_index()
+end)
+
+minetest.register_on_leaveplayer(function(player)
+	local name = player:get_player_name()
+	wield[name] = nil
+	wieldindex[name] = nil
+end)
+
+local function get_first_line(text)
+	-- Cut off text after first newline
+	local firstnewline = string.find(text, "\n")
+	if firstnewline then
+		text = string.sub(text, 1, firstnewline-1)
+	end
+	return text
+end
+
+if not show_already_implemented() then
+	minetest.register_globalstep(function(dtime)
+		for _, player in pairs(minetest.get_connected_players()) do
+			local player_name = player:get_player_name()
+			local wstack = player:get_wielded_item()
+			local wname = wstack:get_name()
+			local windex = player:get_wield_index()
+
+			if dtimes[player_name] and dtimes[player_name] < dlimit then
+				dtimes[player_name] = dtimes[player_name] + dtime
+				if dtimes[player_name] > dlimit and huds[player_name] then
+					player:hud_change(huds[player_name], 'text', "")
+				end
+			end
+
+			-- Update HUD when wielded item or wielded index changed
+			if wname ~= wield[player_name] or windex ~= wieldindex[player_name] then
+				wieldindex[player_name] = windex
+				wield[player_name] = wname
+				dtimes[player_name] = 0
+
+				if huds[player_name] then 
+
+					-- Get description (various fallback checks for old Luanti/Minetest versions)
+					local def = minetest.registered_items[wname]
+					local desc
+					if wstack.get_short_description then
+						-- get_short_description()
+						desc = wstack:get_short_description()
+					end
+					if (not desc or desc == "") and wstack.get_description then
+						-- get_description()
+						desc = wstack:get_description()
+						desc = get_first_line(desc)
+					end
+					if (not desc or desc == "") and not wstack.get_description then
+						-- Metadata (old versions only)
+						local meta = wstack:get_meta()
+						desc = meta:get_string("description")
+						desc = get_first_line(desc)
+					end
+					if not desc or desc == "" then
+						-- Item definition
+						desc = def.description
+						desc = get_first_line(desc)
+					end
+					if not desc or desc == "" then
+						-- Final fallback: itemstring
+						desc = wname
+					end
+
+					-- Print description
+					if desc then
+						-- Optionally append the 'technical' itemname
+						local tech = minetest.settings:get_bool("show_wielded_item_itemname", false)
+						if tech and desc ~= "" then
+							desc = desc .. " ["..wname.."]"
+						end
+						player:hud_change(huds[player_name], 'text', desc)
+					end
+				end
+			end
+		end
+	end)
+end