curds: Add basic playlist class

The intention is that different playlist types will create a subclass of
this class to do whatever work they need.

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

curds/playlist/__init__.py

@@ -0,0 +1 @@
+# Copyright 2019 (c) Anna Schumaker.

curds/playlist/playlist.py

@@ -0,0 +1,20 @@
+# Copyright 2019 (c) Anna Schumaker.
+
+class Playlist(list):
+    def __init__(self, name):
+        self.name = name
+
+    def add(self, track):
+        if track is not None:
+            self.append(track)
+
+    def runtime(self):
+        m, s = divmod(sum([ track.length for track in self ]), 60)
+        h, m = divmod(m, 60)
+        d, h = divmod(h, 24)
+        res  = [ ]
+        if d > 0: res.append(f"{int(d)} day{'s' if d != 1 else ''}")
+        if h > 0: res.append(f"{int(h)} hour{'s' if h != 1 else ''}")
+        if m > 0: res.append(f"{int(m)} minute{'s' if m  != 1 else ''}")
+        if s > 0: res.append(f"{int(s)} second{'s' if s  != 1 else ''}")
+        return ", ".join(res)

curds/playlist/test_playlist.py

@@ -0,0 +1,57 @@
+# Copyright 2019 (c) Anna Schumaker.
+from . import playlist
+from .. import tags
+import os
+import unittest
+
+test_library = os.path.abspath("./trier/Test Library")
+
+class TestPlaylist(unittest.TestCase):
+    def setUp(self):
+        tags.tag_map.clear()
+
+    def test_playlist_init(self):
+        plist = playlist.Playlist("Test Playlist")
+        self.assertIsInstance(plist, list)
+        self.assertEqual(plist.name, "Test Playlist")
+        self.assertEqual(len(plist), 0)
+        self.assertEqual(plist.runtime(), "")
+
+    def test_playlist_add(self):
+        path  = os.path.join(test_library, "Test Artist 01", "Test Album 1")
+        plist = playlist.Playlist("Test Playlist")
+
+        plist.add(tags.Track.add(os.path.join(path, "01 - Test Track 01.ogg")))
+        self.assertEqual(len(plist), 1)
+        self.assertEqual(plist.runtime(), "1 second")
+
+        plist.add(tags.Track.add(os.path.join(path, "02 - Test Track 02.ogg")))
+        self.assertEqual(len(plist), 2)
+        self.assertEqual(plist.runtime(), "3 seconds")
+
+        plist.add(None)
+        self.assertEqual(len(plist), 2)
+        self.assertEqual(plist.runtime(), "3 seconds")
+        self.assertNotIn(None, plist)
+
+    def test_playlist_runtime(self):
+        path  = os.path.join(test_library, "Test Artist 01", "Test Album 1")
+        track = tags.Track.add(os.path.join(path, "01 - Test Track 01.ogg"))
+        plist = playlist.Playlist("Test Playlist")
+
+        plist.add(track)
+        self.assertEqual(plist.runtime(), "1 second")
+        track.length = 2
+        self.assertEqual(plist.runtime(), "2 seconds")
+        track.length = 60
+        self.assertEqual(plist.runtime(), "1 minute")
+        track.length = 120
+        self.assertEqual(plist.runtime(), "2 minutes")
+        track.length = 3600
+        self.assertEqual(plist.runtime(), "1 hour")
+        track.length = 7200
+        self.assertEqual(plist.runtime(), "2 hours")
+        track.length = 86400
+        self.assertEqual(plist.runtime(), "1 day")
+        track.length = 172800
+        self.assertEqual(plist.runtime(), "2 days")

test_emmental.py

@@ -8,3 +8,5 @@ class TestEmmental(unittest.TestCase):
         self.assertIsNotNone(curds.data)
         self.assertIsNotNone(curds.tags)
         self.assertIsNotNone(curds.threadqueue)
+        self.assertIsNotNone(curds.playlist)
+        self.assertIsNotNone(curds.playlist.playlist)