curds: Add a Collection playlist

This playlist collects all tracks that the user has added, across all
libraries.

Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

curds/playlist/manager.py

@@ -1,5 +1,6 @@
 # Copyright 2019 (c) Anna Schumaker.
 from . import library
+from . import playlist
 import os
 
 class LibraryManager(dict):
@@ -12,4 +13,10 @@ class LibraryManager(dict):
 
 class PlaylistManager(dict):
     def __init__(self):
-        self["Library"] = LibraryManager()
+        self["Collection"] = playlist.Playlist("collection")
+        self["Library"]    = LibraryManager()
+
+        playlist.Playlist.notify_me("on-scan", self.on_scan)
+
+    def on_scan(self, plist, track):
+        self["Collection"].add(track)

curds/playlist/test_manager.py

@@ -1,6 +1,8 @@
 # Copyright 2019 (c) Anna Schumaker.
 from . import library
 from . import manager
+from . import playlist
+from .. import tags
 from .. import threadqueue
 import os
 import unittest
@@ -10,15 +12,20 @@ test_library = os.path.abspath("./trier/Test Library")
 
 class TestPlaylistManager(unittest.TestCase):
     def setUp(self):
+        tags.tag_map.clear()
         if not library.library_thread.is_alive():
             library.library_thread = threadqueue.ThreadQueue()
 
+    def tearDown(self):
+        library.library_thread.stop()
+
     def test_manager_init(self):
         playman = manager.PlaylistManager()
         self.assertIsInstance(playman, manager.PlaylistManager)
         self.assertIsInstance(playman, dict)
-        self.assertIsInstance(playman["Library"], manager.LibraryManager)
-        self.assertIsInstance(playman["Library"], dict)
+        self.assertIsInstance(playman["Collection"], playlist.Playlist)
+        self.assertIsInstance(playman["Library"],    manager.LibraryManager)
+        self.assertIsInstance(playman["Library"],    dict)
 
     def test_manager_library(self):
         playman = manager.PlaylistManager()
@@ -33,4 +40,12 @@ class TestPlaylistManager(unittest.TestCase):
         self.assertIn(alist, playman["Library"].values())
         self.assertIn(plist, playman["Library"].values())
 
-        library.library_thread.stop()
+    def test_manager_on_scan(self):
+        playman = manager.PlaylistManager()
+        alist   = playman["Library"][test_album]
+        plist   = playman["Library"][test_library]
+
+        library.library_thread.join()
+        self.assertEqual(len(plist), 1250)
+        self.assertEqual(len(alist), 11)
+        self.assertEqual(len(playman["Collection"]), len(alist) + len(plist))