curds: Create a Collection playlist type

This represents all tracks added to the collection, from across all
library paths. We also fix the value of Playlist.loop to "True" and
prevent changing it

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

curds/playlist/collection.py

@@ -0,0 +1,13 @@
+# Copyright 2019 (c) Anna Schumaker.
+from . import playlist
+from .. import notify
+
+class CollectionPlaylist(playlist.Playlist):
+    def __init__(self):
+        playlist.Playlist.__init__(self, "Collection")
+        notify.Notify.notify_me("new-track", self.add)
+        self.loop = True
+
+    def set_loop(self, loop):
+        self.loop = True
+        return self.loop

curds/playlist/manager.py

@@ -1,7 +1,6 @@
 # Copyright 2019 (c) Anna Schumaker.
+from . import collection
 from . import library
-from . import playlist
-from .. import notify
 import os
 
 class LibraryManager(dict):
@@ -14,10 +13,5 @@ class LibraryManager(dict):
 
 class PlaylistManager(dict):
     def __init__(self):
-        self["Collection"] = playlist.Playlist("Collection")
+        self["Collection"] = collection.CollectionPlaylist()
         self["Library"]    = LibraryManager()
-
-        notify.Notify.notify_me("new-track", self.on_new_track)
-
-    def on_new_track(self, track):
-        self["Collection"].add(track)

curds/playlist/test_collection.py

@@ -0,0 +1,25 @@
+# Copyright 2019 (c) Anna Schumaker.
+from . import collection
+from . import playlist
+from .. import tags
+import os
+import unittest
+
+test_album = os.path.abspath("./trier/Test Album")
+
+class TestCollectionPlaylist(unittest.TestCase):
+    def test_collection_plist(self):
+        plist = collection.CollectionPlaylist()
+
+        self.assertIsInstance(plist,  collection.CollectionPlaylist)
+        self.assertIsInstance(plist,  playlist.Playlist)
+        self.assertEqual(plist.name, "Collection")
+        self.assertEqual(len(plist),  0)
+
+        track1 = tags.Track.lookup(os.path.join(test_album, "01 - Test Track.ogg"))
+        self.assertEqual(len(plist),  1)
+        self.assertEqual(plist[0],    track1)
+
+        self.assertTrue(plist.loop)
+        self.assertTrue(plist.set_loop(False))
+        self.assertTrue(plist.loop)

curds/playlist/test_manager.py

@@ -1,4 +1,5 @@
 # Copyright 2019 (c) Anna Schumaker.
+from . import collection
 from . import library
 from . import manager
 from . import playlist
@@ -25,7 +26,7 @@ class TestPlaylistManager(unittest.TestCase):
         playman = manager.PlaylistManager()
         self.assertIsInstance(playman, manager.PlaylistManager)
         self.assertIsInstance(playman, dict)
-        self.assertIsInstance(playman["Collection"], playlist.Playlist)
+        self.assertIsInstance(playman["Collection"], collection.CollectionPlaylist)
         self.assertIsInstance(playman["Library"],    manager.LibraryManager)
         self.assertIsInstance(playman["Library"],    dict)