curds: Implement a track.decade() function

We could figure this out in the decade playlist code, but it's easier to
just do it inside the track itself.

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

curds/playlist/decade.py

@@ -5,9 +5,6 @@ from .. import notify
 
 DECADE_ICON = "x-office-calendar"
 
-def decade(year):
-    return f"{int(year) // 10 * 10}s"
-
 
 class DecadePlaylist(playlist.Playlist):
     def alloc_child(self, name, icon):
@@ -31,4 +28,4 @@ class DecadeNode(node.PlaylistNode):
                     [ "date", "artist", "album", "discnumber", "tracknumber" ])
 
     def new_track(self, track):
-        self.find_child(decade(track["date"]), DECADE_ICON).add(track)
+        self.find_child(track.decade(), DECADE_ICON).add(track)

curds/playlist/test_decade.py

@@ -17,11 +17,6 @@ class TestDecadePlaylist(unittest.TestCase):
         notify.clear()
         trak.reset()
 
-    def test_decade(self):
-        self.assertEqual(decade.decade( 1971),  "1970s")
-        self.assertEqual(decade.decade( 1989),  "1980s")
-        self.assertEqual(decade.decade("2222"), "2220s")
-
     def test_decade_node(self):
         dnode = decade.DecadeNode()
         self.assertIsInstance(dnode, node.PlaylistNode)

curds/trak/test_track.py

@@ -49,6 +49,12 @@ class TestTrackTag(unittest.TestCase):
         self.assertEqual(t.tracknumber, 0)
         self.assertEqual(t.tracktotal,  0)
 
+    def test_track_decade(self):
+        t = track.Track(os.path.join(test_tracks, "01 - Test Track.ogg"))
+        self.assertEqual(t.decade(), "2010s")
+        t.date = 1975
+        self.assertEqual(t.decade(), "1970s")
+
     def test_track_getitem(self):
         p = [ test_tracks, "01 - Test Track.ogg" ]
         t = track.Track(os.path.join(*p))

curds/trak/track.py

@@ -3,6 +3,7 @@ from . import tagfile
 from .. import notify
 from .. import sort
 import os
+import sys
 
 class Track:
     def __init__(self, path):
@@ -31,6 +32,9 @@ class Track:
         item = vars(self).get(key)
         return str(item) if item != None else None
 
+    def decade(self):
+        return f"{self.date // 10 * 10}s"
+
     def sort_key(self, fields):
         ret = [ ]
         for field in fields: