hudbars/hbhunger/init.lua

if not minetest.setting_getbool("enable_damage") then
	return
end

hbhunger = {}
hbhunger.hunger = {} -- HUD statbar values
hbhunger.hunger_out = {}
hbhunger.exhaustion = {} -- Exhaustion is experimental!

-- HUD item ids
local hunger_hud = {}

HUNGER_HUD_TICK = 0.5 -- was 0.1
HUNGER_HUNGER_TICK = 500 -- time in seconds after that 1 hunger point is taken (600)
HUNGER_EXHAUST_DIG = 3  -- exhaustion increased this value after digged node
HUNGER_EXHAUST_PLACE = 1 -- exhaustion increased this value after placed
HUNGER_EXHAUST_MOVE = 0.3 -- exhaustion increased this value if player movement detected
HUNGER_EXHAUST_LVL = 160 -- at what exhaustion player satiation gets lowerd


--[[load custom settings
local set = io.open(minetest.get_modpath("hbhunger").."/hbhunger.conf", "r")
if set then 
	dofile(minetest.get_modpath("hbhunger").."/hbhunger.conf")
	set:close()
end--]]

local function custom_hud(player)

	hb.init_hudbar(player, "satiation", hbhunger.get_hunger(player))
end

dofile(minetest.get_modpath("hbhunger") .. "/hunger.lua")

-- register satiation hudbar
hb.register_hudbar(
	"satiation", 0xFFFFFF, "Satiation",
	{
		icon = "hbhunger_icon.png",
		bgicon = "hbhunger_bgicon.png",
		bar = "hbhunger_bar.png"
	},
	20, 30, false
)

-- update hud elemtents if value has changed
local function update_hud(player)

	if not player then return end

	local name = player:get_player_name()
	local h_out = tonumber(hbhunger.hunger_out[name])
	local h = tonumber(hbhunger.hunger[name])

	if h_out ~= h then

		hbhunger.hunger_out[name] = h
		hb.change_hudbar(player, "satiation", h)
	end
end

hbhunger.get_hunger = function(player)

	local inv = player:get_inventory()

	if not inv then return nil end

	local hgp = inv:get_stack("hunger", 1):get_count()

	if hgp == 0 then

		hgp = 21

		inv:set_stack("hunger", 1, ItemStack({name = ":", count = hgp}))
	else
		hgp = hgp
	end

	return hgp - 1
end

hbhunger.set_hunger = function(player)
	local inv = player:get_inventory()
	local name = player:get_player_name()
	local value = hbhunger.hunger[name]
	if not inv  or not value then return nil end
	if value > 30 then value = 30 end
	if value < 0 then value = 0 end
	inv:set_stack("hunger", 1, ItemStack({name = ":", count = value + 1}))
	return true
end

minetest.register_on_joinplayer(function(player)

	local name = player:get_player_name()
	local inv = player:get_inventory()

	inv:set_size("hunger", 1)

	hbhunger.hunger[name] = hbhunger.get_hunger(player)
	hbhunger.hunger_out[name] = hbhunger.hunger[name]
	hbhunger.exhaustion[name] = 0

	custom_hud(player)

	hbhunger.set_hunger(player)
end)

minetest.register_on_respawnplayer(function(player)

	-- reset hunger (and save)
	local name = player:get_player_name()

	hbhunger.hunger[name] = 20
	hbhunger.set_hunger(player)
	hbhunger.exhaustion[name] = 0
end)

local main_timer = 0
local timer = 0
local timer2 = 0

minetest.register_globalstep(function(dtime)

	main_timer = main_timer + dtime
	timer = timer + dtime
	timer2 = timer2 + dtime

	if main_timer > HUNGER_HUD_TICK
	or timer > 4
	or timer2 > HUNGER_HUNGER_TICK then

		if main_timer > HUNGER_HUD_TICK then
			main_timer = 0
		end

		for _,player in pairs(minetest.get_connected_players()) do

			local name = player:get_player_name()
			local h = tonumber(hbhunger.hunger[name])
			local hp = player:get_hp()

			if timer > 4 then

				-- heal player by 1 hp if not dead and satiation is > 15
				if h > 15
				and hp > 0
				and player:get_breath() > 0 then

					player:set_hp(hp + 1)

				-- or damage player by 1 hp if satiation is < 2
				elseif h <= 1 then

					if hp - 1 >= 0 then
						player:set_hp(hp - 1)
					end
				end
			end

			-- lower satiation by 1 point after xx seconds
			if timer2 > HUNGER_HUNGER_TICK then

					if h > 0 then

					h = h - 1

					hbhunger.hunger[name] = h
					hbhunger.set_hunger(player)
				end
			end

			-- update hud elements
			update_hud(player)

			-- Determine if player is walking
			local controls = player:get_player_control()
			if controls.up
			or controls.down
			or controls.left
			or controls.right then

				hbhunger.handle_node_actions(nil, nil, player)
			end

		end

	end

	if timer > 4 then
		timer = 0
	end

	if timer2 > HUNGER_HUNGER_TICK then
		timer2 = 0
	end

end)