Add a basic hardcore_mode that's enabled via the game menu settings.

mods/HUD/mcl_inventory/init.lua

@@ -199,7 +199,8 @@ end
 
 local gamemodes = {
 	"survival",
-	"creative"
+	"creative",
+	"spectator"
 }
 
 function mcl_inventory.player_set_gamemode(p,g)
@@ -208,8 +209,12 @@ function mcl_inventory.player_set_gamemode(p,g)
 	if g == "survival" then
 		 mcl_experience.setup_hud(p)
 		 mcl_experience.update(p)
+		 mcl_hardcore.spectator_mode_disabled(p)
 	elseif g == "creative" then
 		 mcl_experience.remove_hud(p)
+		 mcl_hardcore.spectator_mode_disabled(p)
+	elseif g == "spectator" then
+		 mcl_hardcore.spectator_mode(p)
 	end
 	mcl_meshhand.update_player(p)
 	set_inventory(p)

mods/ITEMS/mcl_potions/functions.lua

@@ -18,7 +18,25 @@ end
 
 local icon_ids = {}
 
+-- Hardcore mode Healthbar change
+local file = io.open(minetest.get_worldpath().."/hardcore_mode.txt", "r")
+if file ~= nil then
+	hardcore_world = true
+end
+
 local function potions_set_hudbar(player)
+	if hardcore_world then
+
+		if EF.poisoned[player] and EF.regenerating[player] then
+			hb.change_hudbar(player, "health", nil, nil, "hbhunger_icon_regen_poison_hardcore.png", nil, "hudbars_bar_health.png")
+		elseif EF.poisoned[player] then
+			hb.change_hudbar(player, "health", nil, nil, "hbhunger_icon_health_poison_hardcore.png", nil, "hudbars_bar_health.png")
+		elseif EF.regenerating[player] then
+			hb.change_hudbar(player, "health", nil, nil, "hudbars_icon_regenerate_hardcore.png", nil, "hudbars_bar_health.png")
+		else
+			hb.change_hudbar(player, "health", nil, nil,  "hudbars_icon_health_hardcore.png", nil, "hudbars_bar_health.png")
+		end
+	else
 
 		if EF.poisoned[player] and EF.regenerating[player] then
 			hb.change_hudbar(player, "health", nil, nil, "hbhunger_icon_regen_poison.png", nil, "hudbars_bar_health.png")
@@ -29,7 +47,7 @@ local function potions_set_hudbar(player)
 		else
 			hb.change_hudbar(player, "health", nil, nil,  "hudbars_icon_health.png", nil, "hudbars_bar_health.png")
 		end
-
+	end
 end
 
 local function potions_init_icons(player)

mods/PLAYER/mcl_hardcore/README.md

@@ -0,0 +1,32 @@
+
+## mcl_hardcore
+
+
+A fork of: YOLO - You Only Live Once by sofar
+Heavily modified by MysticTempest for MineClone2
+
+A simple player-based hardcore mod.
+
+Players will only have one life in hardcore mode, after dying they will be placed into spectator mode.
+As spectators, they will be be: unable to interact with the world, immortal, invisible, have noclip and fly, and health/hunger hudbars will be hidden.
+
+
+Enabling:  
+Enabled via a "Settings" option; newly created worlds will be set to Hardcore Mode. 
+
+Extra Note:  
+You only need to toggle it on when creating a hardcore world. 
+
+After doing so; you may 'disable' it again to create non-hardcore worlds.
+Hardcore mode for that world will persist after world creation, and across any "Settings" change.
+
+
+
+---------
+Code:  
+	Author: Copyright (C) 2019 - Auke Kok <sofar@foo-projects.org>
+			Copyright (C) 2022 - MysticTempest
+	License: LGPL-2.1-or-later
+
+Texture:
+	"*_hardcore.png" - derivative of PixelPerfection heart textures: CC-By SA 4.0

mods/PLAYER/mcl_hardcore/init.lua

@@ -0,0 +1,129 @@
+--[[
+Copyright (C) 2019 - Auke Kok <sofar@foo-projects.org>
+Copyright (C) 2022 - MysticTempest
+
+"mcl_hardcore" is a fork of "yolo", is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as
+published by the Free Software Foundation; either version 2.1
+of the license, or (at your option) any later version.
+
+--]]
+
+-- Spectator mode:
+--	Players are unable to interact with the world, invisible, have fast, fly & noclip, are immortal and their health/hunger hudbars are hidden.
+--
+--
+
+mcl_hardcore = {}
+
+-- Write Hardcore mode state to world.
+function mcl_hardcore.save()
+	local file = io.open(minetest.get_worldpath().."/hardcore_mode.txt", "w")
+	if file then
+		file:write("Enabled")
+		file:close()
+	end
+	hardcore_world = true
+end
+
+
+-- Spectator mode
+function mcl_hardcore.spectator_mode(player)
+	local meta = player:get_meta()
+	local player_name = player:get_player_name()
+
+	meta:set_int("mcl_privs:interact_revoked", 1)
+	player:set_armor_groups({immortal=1})
+	minetest.set_player_privs(player_name, {fly=true,fast=true,noclip=true,interact=nil})
+
+	-- Have to wait since mcl_potions clears old effects on startup.
+	minetest.after(3, function(player)
+		mcl_potions._reset_player_effects(player) -- Fix some cases of not clearing.
+		mcl_potions.invisiblility_func(player, null, 86400) -- Invisible for 24 hours.
+		hb.hide_hudbar(player, "hunger")
+		hb.change_hudbar(player, "health", nil, nil,  "blank.png", nil, "hudbars_bar_health.png")
+		mcl_experience.remove_hud(player)
+	end, player)
+	if meta:get_string("gamemode") ~= "spectator" then
+		meta:set_string("gamemode","spectator")
+	end
+end
+
+function mcl_hardcore.spectator_mode_disabled(player)
+	local meta = player:get_meta()
+	local player_name = player:get_player_name()
+	local privs = minetest.get_player_privs(player_name)
+
+
+	if meta:get_int("dead") == 1 and hardcore_world==true then
+		meta:set_string("gamemode","spectator")
+		minetest.chat_send_player(player_name, "You died in hardcore mode; spectator mode not disabled.")
+		return
+	else
+		minetest.after(3, function(player) -- Fix startup crash conflict by waiting slightly.
+			mcl_potions._reset_player_effects(player)
+			mcl_potions.invisiblility_func(player, null, 0)
+			hb.unhide_hudbar(player, "hunger")
+			meta:set_int("mcl_privs:interact_revoked", 0)
+			player:set_armor_groups({immortal=0})
+
+			-- Try to preserve privs somewhat
+			if meta:get_string("gamemode") == "spectator" then
+				meta:set_string("gamemode","")
+			elseif meta:get_string("gamemode") == "creative" then
+				privs.fast = nil
+				privs.noclip = nil
+				privs.fly = true
+				privs.interact = true
+				minetest.set_player_privs(player_name, privs)
+			else -- survival; only basic privs
+				minetest.set_player_privs(player_name, {basic_privs=true})
+			end
+		end, player)
+	end
+end
+
+
+-- Hardcore mode
+function mcl_hardcore.hardcore_mode(player)
+	local meta = player:get_meta()
+	local player_name = player:get_player_name()
+	if meta:get_int("dead") == 1 then
+		mcl_hardcore.spectator_mode(player)
+		minetest.chat_send_player(player_name, "You died in hardcore mode; rejoining as a spectator.")
+	end
+
+	minetest.register_on_dieplayer(function(player, reason)
+		local name = player:get_player_name()
+		local meta = player:get_meta()
+		meta:set_int("dead", 1)
+	end)
+
+	-- Make player a spectator on respawn in hardcore mode.
+	minetest.register_on_respawnplayer(function(player)
+		local meta = player:get_meta()
+		local player_name = player:get_player_name()
+		if meta:get_int("dead") == 1 then
+			mcl_hardcore.spectator_mode(player)
+			minetest.chat_send_player(player_name, "You died in hardcore mode; respawning as a spectator.")
+		end
+	end)
+end
+
+
+local hardcore_mode = minetest.settings:get_bool("enable_hardcore_mode", false)
+--Set world state:
+minetest.register_on_joinplayer(function(player)
+	if minetest.get_gametime() <= 5 and hardcore_mode then
+		mcl_hardcore.save()
+	else
+		local file = io.open(minetest.get_worldpath().."/hardcore_mode.txt", "r")
+		if file ~= nil then
+			hardcore_world = true
+		end
+	end
+	if hardcore_world then
+		mcl_hardcore.hardcore_mode(player)
+	end
+
+end)

mods/PLAYER/mcl_hardcore/mod.conf

@@ -0,0 +1,4 @@
+name = mcl_hardcore
+license = LGPL-2.1
+description = Hardcore mode - death is permanent. A fork of sofar's YOLO mod.
+depends = mcl_potions, hudbars, mcl_inventory

settingtypes.txt

@@ -45,6 +45,16 @@ mcl_disabled_structures (Disabled structures) string
 # Comma separated list of disabled event names
 mcl_disabled_events (Disabled events) string
 
+# If enabled, newly created worlds will be in Hardcore Mode.
+#
+# In this mode; you will only have 1 life to use.
+# After death you will be dropped into spectator mode, and will be unable to interact with the world.
+#
+# Extra Note:
+# After creating your HC world; you may set this back to disabled to create non-HC worlds.
+# As Hardcore Mode is saved to the world, and will persist across any settings change.
+enable_hardcore_mode (Enable Hardcore mode) bool false
+
 [Players]
 # If enabled, players respawn at the bed they last lay on instead of normal
 # spawn.