enable 16-slot hotbar

add custom hotbar-selected image
delete gui_hotbar.png

mods/default/commands.lua

@@ -0,0 +1,23 @@
+hotbar_size = minetest.setting_get("hotbar_size") or 16
+
+minetest.register_on_joinplayer(function(player)
+	player:hud_set_hotbar_itemcount(hotbar_size)
+	minetest.after(0.5,function()
+		player:hud_set_hotbar_selected_image("gui_hotbar_selected.png")
+	end)
+end)
+
+minetest.register_chatcommand("hotbar", {
+	params = "[size]",
+	description = "Sets the size of your hotbar",
+	func = function(name, slots)
+		if slots == "" then slots = 16 end
+		if type(tonumber(slots)) ~= "number" or tonumber(slots) < 1 or tonumber(slots) > 23 then
+			minetest.chat_send_player(name, "[_] Hotbar size must be between 1 and 23.")
+			return
+		end
+		local player = minetest.get_player_by_name(name)
+		player:hud_set_hotbar_itemcount(tonumber(slots))
+		minetest.chat_send_player(name, "[_] Hotbar size set to " .. tonumber(slots) .. ".")
+	end,
+})

mods/default/init.lua

@@ -44,5 +44,6 @@ dofile(minetest.get_modpath("default").."/crafting.lua")
 dofile(minetest.get_modpath("default").."/mapgen.lua")
 dofile(minetest.get_modpath("default").."/player.lua")
 dofile(minetest.get_modpath("default").."/trees.lua")
+dofile(minetest.get_modpath("default").."/commands.lua")
 dofile(minetest.get_modpath("default").."/aliases.lua")
 dofile(minetest.get_modpath("default").."/legacy.lua")