From 1127231ca9333497d70debc07c9ae0293c42be6f Mon Sep 17 00:00:00 2001
From: cora <coradelamouche@gmx.ch>
Date: Fri, 27 May 2022 15:06:25 +0200
Subject: [PATCH 1/2] Fix crash on non existent xp-hud due to gamemode

---
 mods/HUD/mcl_experience/init.lua | 60 ++++++++++++++++++--------------
 1 file changed, 33 insertions(+), 27 deletions(-)

diff --git a/mods/HUD/mcl_experience/init.lua b/mods/HUD/mcl_experience/init.lua
index aea805fa2..6ead36687 100644
--- a/mods/HUD/mcl_experience/init.lua
+++ b/mods/HUD/mcl_experience/init.lua
@@ -156,33 +156,7 @@ function mcl_experience.throw_xp(pos, total_xp)
 	end
 end
 
-function mcl_experience.update(player)
-	local xp = mcl_experience.get_xp(player)
-	local cache = caches[player]
-
-	cache.level = xp_to_level(xp)
-
-	if not minetest.is_creative_enabled(player:get_player_name()) then
-		player:hud_change(hud_bars[player], "text", "mcl_experience_bar_background.png^[lowpart:"
-			.. math.floor(math.floor(xp_to_bar(xp, cache.level) * 18) / 18 * 100)
-			.. ":mcl_experience_bar.png^[transformR270"
-		)
-
-		if cache.level == 0 then
-			player:hud_change(hud_levels[player], "text", "")
-		else
-			player:hud_change(hud_levels[player], "text", tostring(cache.level))
-		end
-	end
-end
-
-function mcl_experience.register_on_add_xp(func, priority)
-	table.insert(mcl_experience.on_add_xp, {func = func, priority = priority or 0})
-end
-
--- callbacks
-
-minetest.register_on_joinplayer(function(player)
+local function setup_hud(player)
 	caches[player] = {
 		last_time = get_time(),
 	}
@@ -205,7 +179,39 @@ minetest.register_on_joinplayer(function(player)
 			z_index = 12,
 		})
 	end
+end
 
+function mcl_experience.update(player)
+	local xp = mcl_experience.get_xp(player)
+	local cache = caches[player]
+
+	cache.level = xp_to_level(xp)
+
+	if not minetest.is_creative_enabled(player:get_player_name()) then
+		if not hud_bars[player] then
+			setup_hud(player)
+		end
+		player:hud_change(hud_bars[player], "text", "mcl_experience_bar_background.png^[lowpart:"
+			.. math.floor(math.floor(xp_to_bar(xp, cache.level) * 18) / 18 * 100)
+			.. ":mcl_experience_bar.png^[transformR270"
+		)
+
+		if cache.level == 0 then
+			player:hud_change(hud_levels[player], "text", "")
+		else
+			player:hud_change(hud_levels[player], "text", tostring(cache.level))
+		end
+	end
+end
+
+function mcl_experience.register_on_add_xp(func, priority)
+	table.insert(mcl_experience.on_add_xp, {func = func, priority = priority or 0})
+end
+
+-- callbacks
+
+minetest.register_on_joinplayer(function(player)
+	setup_hud(player)
 	mcl_experience.update(player)
 end)
 

From ae2860d017e9c962384528c971c07d96eb0f9dfd Mon Sep 17 00:00:00 2001
From: cora <coradelamouche@gmx.ch>
Date: Fri, 27 May 2022 19:56:47 +0200
Subject: [PATCH 2/2] Show/Hide XP-hud immediately after gamemode switch

---
 mods/HUD/mcl_experience/init.lua | 19 ++++++++++++++++---
 mods/HUD/mcl_inventory/init.lua  |  6 ++++++
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/mods/HUD/mcl_experience/init.lua b/mods/HUD/mcl_experience/init.lua
index 6ead36687..37250ee2f 100644
--- a/mods/HUD/mcl_experience/init.lua
+++ b/mods/HUD/mcl_experience/init.lua
@@ -156,7 +156,20 @@ function mcl_experience.throw_xp(pos, total_xp)
 	end
 end
 
-local function setup_hud(player)
+function mcl_experience.remove_hud(player)
+	if hud_bars[player] then
+		player:hud_remove(hud_bars[player])
+		hud_bars[player] = nil
+	end
+	if hud_levels[player] then
+		player:hud_remove(hud_levels[player])
+		hud_levels[player] = nil
+	end
+end
+
+function mcl_experience.setup_hud(player)
+	if hud_bars[player] and hud_levels[player] then return end
+	mcl_experience.remove_hud(player)
 	caches[player] = {
 		last_time = get_time(),
 	}
@@ -189,7 +202,7 @@ function mcl_experience.update(player)
 
 	if not minetest.is_creative_enabled(player:get_player_name()) then
 		if not hud_bars[player] then
-			setup_hud(player)
+			mcl_experience.setup_hud(player)
 		end
 		player:hud_change(hud_bars[player], "text", "mcl_experience_bar_background.png^[lowpart:"
 			.. math.floor(math.floor(xp_to_bar(xp, cache.level) * 18) / 18 * 100)
@@ -211,7 +224,7 @@ end
 -- callbacks
 
 minetest.register_on_joinplayer(function(player)
-	setup_hud(player)
+	mcl_experience.setup_hud(player)
 	mcl_experience.update(player)
 end)
 
diff --git a/mods/HUD/mcl_inventory/init.lua b/mods/HUD/mcl_inventory/init.lua
index eb6b4c7b1..1a73e59df 100644
--- a/mods/HUD/mcl_inventory/init.lua
+++ b/mods/HUD/mcl_inventory/init.lua
@@ -206,6 +206,12 @@ local gamemodes = {
 function mcl_inventory.player_set_gamemode(p,g)
 	local m = p:get_meta()
 	m:set_string("gamemode",g)
+	if g == "survival" then
+		 mcl_experience.setup_hud(p)
+		 mcl_experience.update(p)
+	elseif g == "creative" then
+		 mcl_experience.remove_hud(p)
+	end
 	set_inventory(p)
 end