curds: Add basic album class

We'll eventually pull out all the fields we need from a Mutagen
FileInfo class, but that has a dictionary-like interface so we can
easily fake one up for testing.

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

.gitignore

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+*__pycache__*

Makefile

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+# Copyright 2019 (c) Anna Schumaker.
+
+clean:
+	rm -rv $(find -name __pycache__ -type d)
+
+tests:
+	python -m unittest discover curds/

curds/album.py

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+# Copyright 2019 (c) Anna Schumaker.
+
+class Album:
+    def __init__(self, fileinfo):
+        self.album = fileinfo.get("album", [ "Unknown Album" ])[0]
+        self.genre = fileinfo.get("genre", [ "Unknown"       ])[0]
+        self.date  = int(fileinfo.get("date", [ 0 ])[0])
+        self.tracktotal  = int(fileinfo.get("tracktotal", [ 0 ])[0])
+        self.albumartist = fileinfo.get("albumartist",
+                                fileinfo.get("album artist",
+                                    fileinfo.get("artist", [ "Unknown Artist" ])))[0]

curds/test_album.py

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+# Copyright 2019 (c) Anna Schumaker
+import unittest
+import album
+
+album_info = {"album" : [ "Test Album" ], "albumartist" : [ "Test Artist" ],
+              "date" : [ "2019" ], "genre" : [ "Test" ], "tracktotal" : [ "1" ]}
+
+class TestAlbumClass(unittest.TestCase):
+    def test_init_basic(self):
+        a = album.Album(album_info)
+        self.assertEqual(a.album, "Test Album")
+        self.assertEqual(a.genre, "Test")
+        self.assertEqual(a.date,   2019)
+        self.assertEqual(a.albumartist, "Test Artist")
+        self.assertEqual(a.tracktotal,   1)
+
+    def test_init_empty(self):
+        a = album.Album({})
+        self.assertEqual(a.album, "Unknown Album")
+        self.assertEqual(a.genre, "Unknown")
+        self.assertEqual(a.date,   0)
+        self.assertEqual(a.albumartist, "Unknown Artist")
+        self.assertEqual(a.tracktotal,   0)
+
+    def test_init_artist_fallback(self):
+        test_info = {"albumartist" : [ "1" ], "album artist" : [ "2" ], "artist" : [ "3" ]}
+        self.assertEqual(album.Album(test_info).albumartist, "1")
+        test_info.pop("albumartist")
+        self.assertEqual(album.Album(test_info).albumartist, "2")
+        test_info.pop("album artist")
+        self.assertEqual(album.Album(test_info).albumartist, "3")
+        test_info.pop("artist")
+        self.assertEqual(album.Album(test_info).albumartist, "Unknown Artist")
+
+if __name__ == '__main__':
+    unittest.main()