Move MusicalKey type out of dbcore module

This is library-specific.

beets/dbcore/types.py

@@ -14,8 +14,6 @@
 
 """Representation of type information for DBCore model fields.
 """
-import re
-
 from . import query
 from beets.util import str2bool
 
@@ -174,31 +172,3 @@ class Boolean(Type):
 
     def parse(self, string):
         return str2bool(string)
-
-
-class MusicalKey(String):
-    """String representing the musical key of a song.
-
-    The standard format is C, Cm, C#, C#m, etc.
-    """
-
-    ENHARMONIC = {
-        r'db': 'c#',
-        r'eb': 'd#',
-        r'gb': 'f#',
-        r'ab': 'g#',
-        r'bb': 'a#',
-    }
-
-    def parse(self, key):
-        key = key.lower()
-        for flat, sharp in self.ENHARMONIC.items():
-            key = re.sub(flat, sharp, key)
-        key = re.sub(r'[\W\s]+minor', 'm', key)
-        return key.capitalize()
-
-    def normalize(self, key):
-        if key is None:
-            return None
-        else:
-            return self.parse(key)

beets/library.py

@@ -20,6 +20,7 @@ import logging
 import shlex
 import unicodedata
 import time
+import re
 from unidecode import unidecode
 from beets.mediafile import MediaFile, MutagenError
 from beets import plugins
@@ -107,6 +108,33 @@ class PathType(types.Type):
             return value
 
 
+class MusicalKey(types.String):
+    """String representing the musical key of a song.
+
+    The standard format is C, Cm, C#, C#m, etc.
+    """
+    ENHARMONIC = {
+        r'db': 'c#',
+        r'eb': 'd#',
+        r'gb': 'f#',
+        r'ab': 'g#',
+        r'bb': 'a#',
+    }
+
+    def parse(self, key):
+        key = key.lower()
+        for flat, sharp in self.ENHARMONIC.items():
+            key = re.sub(flat, sharp, key)
+        key = re.sub(r'[\W\s]+minor', 'm', key)
+        return key.capitalize()
+
+    def normalize(self, key):
+        if key is None:
+            return None
+        else:
+            return self.parse(key)
+
+
 # Special path format key.
 PF_KEY_DEFAULT = 'default'
 
@@ -244,7 +272,7 @@ class Item(LibModel):
         'original_year':        types.PaddedInt(4),
         'original_month':       types.PaddedInt(2),
         'original_day':         types.PaddedInt(2),
-        'initial_key':          types.MusicalKey(),
+        'initial_key':          MusicalKey(),
 
         'length':      types.Float(),
         'bitrate':     types.ScaledInt(1000, u'kbps'),