From bc54eb3f6b245e4d51def6bcfe61be8540560ac4 Mon Sep 17 00:00:00 2001
From: Aleksander Wasaznik <aleksander@wasaznik.com>
Date: Sun, 5 Feb 2017 16:30:18 +0100
Subject: [PATCH] Add singleton playlist manager

Currently implemented is queing, dequening, and automatic title fetch
using metadatafetch.
---
 grzegorz/__init__.py       |  2 ++
 grzegorz/playlistmanage.py | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 grzegorz/playlistmanage.py

diff --git a/grzegorz/__init__.py b/grzegorz/__init__.py
index 640a5fc..c2c0a7c 100644
--- a/grzegorz/__init__.py
+++ b/grzegorz/__init__.py
@@ -1,7 +1,9 @@
 import asyncio
+from . import playlistmanage
 
 async def entry():
     await asyncio.wait([
+        playlistmanage.metadatafetch_loop(),
     ])
 
 def main():
diff --git a/grzegorz/playlistmanage.py b/grzegorz/playlistmanage.py
new file mode 100644
index 0000000..081831e
--- /dev/null
+++ b/grzegorz/playlistmanage.py
@@ -0,0 +1,34 @@
+import asyncio
+
+from . import metadatafetch
+from . import nyasync
+
+metadatafetch_queue = nyasync.Queue()
+async def metadatafetch_loop():
+    async for item in metadatafetch_queue:
+        title = await metadatafetch.title(item.url)
+        item.title = title
+        metadatafetch_queue.task_done()
+
+class PlaylistItem:
+    def __init__(self, url):
+        self.url = url
+        self.title = None
+
+class Playlist:
+    def __init__(self):
+        self.playlist = []
+        self.nonempty = nyasync.Condition(lambda: self.playlist)
+        self.change = nyasync.Event()
+
+    def queue(self, url):
+        item = PlaylistItem(url)
+        self.playlist.append(item)
+        metadatafetch_queue.put_nowait(item)
+        self.nonempty.notify()
+        self.change.notify()
+
+    async def dequeue(self) -> PlaylistItem:
+        await self.nonempty
+        self.change.notify()
+        return self.playlist.pop(0)