compare NFD normalized paths

oml/item/scan.py

@@ -7,6 +7,7 @@ import os
 import shutil
 import stat
 import time
+import unicodedata
 
 import ox
 
@@ -31,6 +32,7 @@ def remove_missing(books=None):
     prefix = get_prefix()
     if books is None:
         books = collect_books(prefix)
+    books = [unicodedata.normalize('NFD', path) for path in books]
     with db.session():
         if os.path.exists(prefix):
             logger.debug('scan for removed files')
@@ -40,6 +42,8 @@ def remove_missing(books=None):
                 if state.shutdown:
                     return
                 path = f.fullpath()
+                path = unicode
+                path = unicodedata.normalize('NFD', path)
                 db_paths.append(path)
                 if f.item:
                     items[path] = f.sha1