Add trivial mcl_music mod and a piano track by diminixed

mods/PLAYER/mcl_music/init.lua

@@ -0,0 +1,90 @@
+local modname = minetest.get_current_modname()
+local modpath = minetest.get_modpath(modname)
+
+local pianowtune = "diminixed-pianowtune01"
+
+local listeners = {}
+
+local weather_state
+
+local function stop_music_for_listener_name(listener_name)
+	if not listener_name then return end
+	local listener = listeners[listener_name]
+	if not listener then return end
+	local handle = listener.handle
+	if not handle then return end
+	minetest.sound_stop(handle)
+	listeners[listener_name].handle = nil
+end
+
+local function stop()
+	for _, player in pairs(minetest.get_connected_players()) do
+		local player_name = player:get_player_name()
+		stop_music_for_listener_name(player_name)
+	end
+end
+
+local function play()
+	local new_weather_state = mcl_weather.get_weather()
+	local was_good_weather = weather_state == "none" or weather_state == "clear"
+	weather_state = new_weather_state
+	local is_good_weather = weather_state == "none" or weather_state == "clear"
+	local is_weather_changed = weather_state ~= new_weather_state
+	if is_weather_changed or not is_good_weather then
+		stop()
+		return
+	end
+	local time = minetest.get_timeofday()
+	if time < 0.2 or time >= 0.8 then
+		stop()
+		return
+	end
+	for _, player in pairs(minetest.get_connected_players()) do
+		local player_name = player:get_player_name()
+		local listener = listeners[player_name]
+		local old_hp = listener and listener.hp
+		local hp = player:get_hp()
+		local is_hp_changed = old_hp and math.abs(old_hp - hp) > 0.00001
+		local handle = listener and listener.handle
+		if is_hp_changed and handle then
+			stop_music_for_listener_name(player_name)
+			return
+		end
+		if handle then
+			return
+		end
+		local spec = {
+			name  = pianowtune,
+			gain  = 0.3,
+			pitch = 1.0,
+		}
+		local parameters = {
+			to_player = player_name,
+			gain      = 1.0,
+			fade      = 0.0,
+			pitch     = 1.0,
+		}
+		handle = minetest.sound_play(spec, parameters, false)
+		listeners[player_name] = {
+			spec       = spec,
+			parameters = parameters,
+			handle     = handle,
+			hp         = hp,
+		}
+	end
+
+	minetest.after(7, play)
+end
+
+minetest.after(15, play)
+
+minetest.register_on_joinplayer(function(player, last_login)
+	local player_name = player:get_player_name()
+	stop_music_for_listener_name(player_name)
+end)
+
+minetest.register_on_respawnplayer(function(player)
+	local player_name = player:get_player_name()
+	stop_music_for_listener_name(player_name)
+end)
+

mods/PLAYER/mcl_music/mod.conf

@@ -0,0 +1,4 @@
+name = mcl_music
+author = diminixed, kay27
+description = Mod check some conditions and plays music
+depends = mcl_player, mcl_weather