[gnome-music/wip/jfelder/playlists-core-rewrite-prep-work: 9/20] playlists: Add a SmartPlaylist class

[Jean Felder <jfelder src gnome org>]

commit 23d3bec9b2499aac46d68449cc3b0d60de6a501b
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Mon Nov 28 18:33:07 2016 +0100

    playlists: Add a SmartPlaylist class
    
    The SmartPlaylist basically has the ::is_smart property
    set to True. All smart playlists now inherit from this
    class.

 gnomemusic/playlists.py | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)
---
diff --git a/gnomemusic/playlists.py b/gnomemusic/playlists.py
index fc4432a1..7b4cd94f 100644
--- a/gnomemusic/playlists.py
+++ b/gnomemusic/playlists.py
@@ -59,7 +59,19 @@ class Playlist(GObject.Object):
         self.props.title = title
 
 
-class MostPlayed(Playlist):
+class SmartPlaylist(Playlist):
+    """Base class for smart playlists"""
+
+    def __repr__(self):
+        return "<SmartPlaylist>"
+
+    def __init__(self):
+        super().__init__()
+
+        self.props.is_smart = True
+
+
+class MostPlayed(SmartPlaylist):
     """Most Played smart playlist"""
 
     def __init__(self):
@@ -71,7 +83,7 @@ class MostPlayed(Playlist):
         self.props.query = Query.get_never_played_songs()
 
 
-class NeverPlayed(Playlist):
+class NeverPlayed(SmartPlaylist):
     """Never Played smart playlist"""
 
     def __init__(self):
@@ -83,7 +95,7 @@ class NeverPlayed(Playlist):
         self.props.query = Query.get_never_played_songs()
 
 
-class RecentlyPlayed(Playlist):
+class RecentlyPlayed(SmartPlaylist):
     """Recently Played smart playlist"""
 
     def __init__(self):
@@ -95,7 +107,7 @@ class RecentlyPlayed(Playlist):
         self.props.query = Query.get_recently_played_songs()
 
 
-class RecentlyAdded(Playlist):
+class RecentlyAdded(SmartPlaylist):
     """Recently Added smart playlist"""
 
     def __init__(self):
@@ -107,7 +119,7 @@ class RecentlyAdded(Playlist):
         self.props.query = Query.get_recently_added_songs()
 
 
-class Favorites(Playlist):
+class Favorites(SmartPlaylist):
     """Favorites smart playlist"""
 
     def __init__(self):