write something there

mods/ethereal/flight.lua

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+
+-- translation and settings
+
+local S = minetest.get_translator("ethereal")
+local flight_secs = minetest.settings:get("ethereal.flightpotion_duration") or (5 * 60)
+local timer_check = 5 -- seconds per check
+
+-- get player timer
+
+local function get_timer(user)
+
+	if not user then return end
+
+	local meta = user:get_meta() ; if not meta then return "" end
+
+	return meta:get_string("ethereal:fly_timer") or ""
+end
+
+-- do we have fly privs
+
+local function has_fly(name)
+	return minetest.get_player_privs(name).fly
+end
+
+-- set player timer
+
+local function set_timer(user, timer)
+
+	local meta = user:get_meta() ; if not meta then return end
+
+	meta:set_string("ethereal:fly_timer", timer)
+end
+
+-- give or revoke fly priv
+
+local function set_flight(user, set)
+
+	local name = user and user:get_player_name() ; if not name then return end
+	local privs = minetest.get_player_privs(name)
+
+	privs.fly = set
+
+	minetest.set_player_privs(name, privs)
+
+	-- when flight removed set timer to temp position
+	if set ~= true then set_timer(user, "-99") end
+end
+
+-- after function
+
+local function ethereal_set_flight(user)
+
+	local name = user and user:get_player_name() ; if not name then return end
+
+	local timer = tonumber(get_timer(user)) or 0
+
+	-- if timer ran out then remove 'fly' privelage
+	if timer <= 0 and timer ~= -99 then
+
+		set_flight(user, nil)
+
+		return
+	end
+
+	local privs = minetest.get_player_privs(name)
+
+	-- have we already applied 'fly' privelage?
+	if not privs.fly then set_flight(user, true) end
+
+	-- handle timer
+	timer = timer - timer_check
+
+	-- show expiration message and play sound
+	if timer <= 10 then
+
+		minetest.chat_send_player(name, minetest.get_color_escape_sequence("#ff5500")
+				.. S("Flight timer about to expire!"))
+
+		minetest.sound_play("default_dig_dig_immediate",
+				{to_player = name, gain = 1.0}, true)
+	end
+
+	set_timer(user, timer) -- set update timer
+
+	-- restart checks
+	minetest.after(timer_check, function()
+		ethereal_set_flight(user)
+	end)
+end
+
+-- on join / leave
+
+minetest.register_on_joinplayer(function(player)
+
+	-- wait 2 seconds before doing flight checks on player
+	minetest.after(2.0, function(player)
+
+		-- get player name and timer
+		local name = player and player:get_player_name() ; if not name then return end
+		local timer = get_timer(player)
+
+		-- if timer is blank and player can already fly then default and return
+		if timer == "" and has_fly(name) then
+
+			set_timer(player, "-99")
+
+			return
+		end
+
+		timer = tonumber(timer) or 0
+
+		-- if timer is set to default then return
+		if timer == -99 then return end
+
+		-- if we got this far and player is flying then start countdown check
+		if has_fly(name) then
+
+			minetest.after(timer_check, function()
+				ethereal_set_flight(player)
+			end)
+		end
+
+	end, player)
+end)
+
+-- potion item
+
+minetest.register_node("ethereal:flight_potion", {
+	description = S("Flight Potion"),
+	drawtype = "plantlike",
+	tiles = {"ethereal_flight_potion.png"},
+	inventory_image = "ethereal_flight_potion.png",
+	wield_image = "ethereal_flight_potion.png",
+	paramtype = "light",
+	sunlight_propagates = true,
+	walkable = false,
+	selection_box = {
+		type = "fixed", fixed = {-0.2, -0.37, -0.2, 0.2, 0.31, 0.2}
+	},
+	groups = {dig_immediate = 3, vessel = 1},
+	sounds = default.node_sound_glass_defaults(),
+
+	on_use = function(itemstack, user, pointed_thing)
+
+		if user.is_fake_player then return end
+
+		-- get info
+		local name = user:get_player_name()
+		local privs = minetest.get_player_privs(name)
+		local timer = get_timer(user)
+
+		if privs.fly then
+
+			local msg = timer
+
+			if timer == "" or timer == "-99" then msg = S("unlimited") end
+
+			minetest.chat_send_player(name, minetest.get_color_escape_sequence("#ffff00")
+					.. S("Flight already granted, @1 seconds left!", msg))
+
+			return
+		end
+
+		set_timer(user, flight_secs) -- set flight timer
+
+		-- show time remaining
+		minetest.chat_send_player(name,
+				minetest.get_color_escape_sequence("#1eff00")
+				.. S("Flight granted, you have @1 seconds!", flight_secs))
+
+		ethereal_set_flight(user) -- start check
+
+		itemstack:take_item() -- take item
+
+		-- return empty bottle
+		local inv = user:get_inventory()
+
+		if inv:room_for_item("main", {name = "vessels:glass_bottle"}) then
+			user:get_inventory():add_item("main", "vessels:glass_bottle")
+		else
+			minetest.add_item(user:get_pos(), {name = "vessels:glass_bottle"})
+		end
+
+		return itemstack
+	end
+})
+
+-- recipe
+
+minetest.register_craft({
+	output = "ethereal:flight_potion",
+	recipe = {
+		{"ethereal:etherium_dust", "ethereal:etherium_dust", "ethereal:etherium_dust"},
+		{"ethereal:etherium_dust", "ethereal:fire_dust", "ethereal:etherium_dust"},
+		{"ethereal:etherium_dust", "vessels:glass_bottle", "ethereal:etherium_dust"}
+	}
+})