feat: emit now-playing json on track change

config/liquidsoap.liq

@@ -6,12 +6,27 @@ settings.log.level.set(3)
 
 source_pw = environment.get(default="", "SOURCE_PW")
 
+def emit_now_playing(station, m) =
+  filename = m["filename"]
+  if filename != "" then
+    payload = json()
+    payload.add("station", station)
+    payload.add("artist", m["artist"])
+    payload.add("title", m["title"])
+    payload.add("album", m["album"])
+    payload.add("filename", filename)
+    payload.add("started_at", string(int_of_float(time())))
+    file.write(data=payload.stringify(), atomic=true, temp_dir="/now-playing", "/now-playing/#{station}.json")
+  end
+end
+
 # === station: minecraft ===
 minecraft = playlist(
   reload_mode="watch",
   mode="randomize",
   "/library/minecraft/tracks"
 )
+minecraft.on_track(fun (m) -> emit_now_playing("minecraft", m))
 minecraft = crossfade(minecraft)
 minecraft = mksafe(minecraft)