server-nalc/mods/gauges/init.lua

-- Adds health bars above players.
-- Code by 4aiman, textures by Calinou. Licensed under CC0.

local hp_bar = {
	physical = false,
	collisionbox = {x = 0, y = 0, z = 0},
	visual = "sprite",
	textures = {"20.png"}, -- The texture is changed later in the code.
	visual_size = {x = 1.5, y = 0.09375, z = 1.5}, -- Y value is (1 / 16) * 1.5.
	wielder = nil,
}

function hp_bar:on_step(dtime)
	local wielder = self.wielder
	if wielder == nil then	
		self.object:remove()
		 return
	elseif minetest.get_player_by_name(wielder:get_player_name()) == nil then
		self.object:remove()
		return
	end
	hp = wielder:get_hp()
	breath = wielder:get_breath()
	self.object:set_properties({textures = {"health_" .. tostring(hp) .. ".png^breath_" .. tostring(breath) .. ".png"}})
end

minetest.register_entity("gauges:hp_bar", hp_bar)

function add_HP_gauge(pl)
		local pos = pl:getpos()
		local ent = minetest.add_entity(pos, "gauges:hp_bar")
		if ent ~= nil then
			ent:set_attach(pl, "", {x = 0, y = 10, z = 0}, {x = 0, y = 0, z = 0})
			ent = ent:get_luaentity()
			ent.wielder = pl
		end
end

if minetest.setting_getbool("health_bars") ~= false -- “If not defined or set to true then”
and minetest.setting_getbool("enable_damage") then -- Health bars only display when damage is enabled.
	minetest.register_on_joinplayer(add_HP_gauge)
end

if minetest.setting_getbool("log_mods") then
	minetest.log("action", "Carbone: [gauges] loaded.")
end