Cleanup BookList classes

src/calibre/devices/interface.py

@@ -387,7 +387,7 @@ class BookList(list):
     __getslice__ = None
     __setslice__ = None
 
-    def __init__(self, oncard, prefix):
+    def __init__(self, oncard, prefix, settings):
         pass
 
     def supports_tags(self):
@@ -402,3 +402,17 @@ class BookList(list):
         '''
         raise NotImplementedError()
 
+    def add_book(self, book, replace_metadata):
+        '''
+        Add the book to the booklist. Intent is to maintain any device-internal
+        metadata. Return True if booklists must be sync'ed
+        '''
+        raise NotImplementedError()
+
+    def remove_book(self, book):
+        '''
+        Remove a book from the booklist. Correct any device metadata at the
+        same time
+        '''
+        raise NotImplementedError()
+

src/calibre/devices/usbms/books.py

@@ -108,9 +108,6 @@ class Book(MetaInformation):
 
 class BookList(_BookList):
 
-    def __init__(self, oncard, prefix, settings):
-        pass
-
     def supports_tags(self):
         return True
 
@@ -118,16 +115,9 @@ class BookList(_BookList):
         book.tags = tags
 
     def add_book(self, book, replace_metadata):
-        '''
-        Add the book to the booklist. Intent is to maintain any device-internal
-        metadata. Return True if booklists must be sync'ed
-        '''
         if book not in self:
             self.append(book)
+            return True
 
     def remove_book(self, book):
-        '''
-        Remove a book from the booklist. Correct any device metadata at the
-        same time
-        '''
         self.remove(book)