curds: Remove the PlaylistManager parent() function

I'm transitioning this class to be a PlaylistNode, and nodes can easily
access their parent through a .parent pointer

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

curds/playlist/manager.py

@@ -15,6 +15,11 @@ class PlaylistManager(list):
         self.append(previous.PreviousPlaylist())
         self.append(genre.GenreNode())
         self.append(library.LibraryNode())
+
+        for plist in self:
+            plist.parent = self
+        self.children = self
+
         self.current = [ self.lookup("Collection") ]
         self.track   = None
 
@@ -28,6 +33,9 @@ class PlaylistManager(list):
             old.changed()
             self.current[0].changed()
 
+    def get_path(self):
+        return [ ]
+
     def index(self, plist):
         for (i, pl) in enumerate(self):
             if id(pl) == id(plist): return i
@@ -76,12 +84,6 @@ class PlaylistManager(list):
         random.setstate(state)
         return res
 
-    def parent(self, child):
-        parent = self
-        if child and child.parent:
-            return child.parent
-        return parent if child in parent else None
-
     def previous(self):
         self.track = self.lookup("Previous").next()
         return self.track

rind/manager.py

@@ -155,19 +155,10 @@ class ManagerModel(GObject.GObject, Gtk.TreeModel):
             playlist.PlistModel.set_playlist(plist)
 
     def playlist_iter(self, plist):
-        parent = curds.PlaylistManager.parent(plist)
-        if parent == None:
+        if plist == None or plist.parent == None:
             return None
-        elif parent == curds.PlaylistManager:
-            iter = Gtk.TreeIter()
-            iter.user_data = parent.index(plist) + 1
-        else:
-            iter = self.playlist_iter(parent)
-            try:
-                iter.user_data2 = plist.node_index() + 1
-            except:
-                iter.user_data2 = parent.index(plist) + 1
-        return iter
+        path = plist.get_path()
+        return self.do_get_iter(path)[1]
 
     def set_filter_text(self, entry):
         try: