add looping to music

lib/audio.lua

@@ -4,9 +4,10 @@ local AnimationNode = require "lib.animation_node"
 --- @class Audio
 --- @field musicVolume number
 --- @field soundVolume number
+--- @field looped boolean
 --- @field animationNode AnimationNode?
---- @field from love.Source
+--- @field from love.Source?
---- @field to love.Source
+--- @field to love.Source?
 audio = {}
 audio.__index = audio
 
@@ -14,7 +15,8 @@ audio.__index = audio
 local function new(musicVolume, soundVolume)
     return setmetatable({
         musicVolume = musicVolume,
-        soundVolume = soundVolume
+        soundVolume = soundVolume,
+        looped = true
     }, audio)
 end
 
@@ -40,8 +42,8 @@ end
 --- @param ms number? in milliseconds
 function audio:crossfade(from, to, ms)
     print("[Audio]: Triggered crossfade")
+    self:play(to)
     to:setVolume(0)
-    to:play()
     self.from = from
     self.to = to
     self.animationNode = AnimationNode {
@@ -60,6 +62,7 @@ end
 --- @param source love.Source
 function audio:play(source)
     if source:getType() == "stream" then
+        source:setLooping(self.looped)
         source:setVolume(self.musicVolume)
         return source:play()
     end