Add tweak to control completion switchover to ASCII

resources/default_tweaks.py

@@ -37,7 +37,6 @@ series_index_auto_increment = 'next'
 # Can be either True or False
 authors_completer_append_separator = False
 
-
 #: Author sort name algorithm
 # The algorithm used to copy author to author_sort
 # Possible values are:
@@ -71,6 +70,15 @@ author_name_suffixes = ('Jr', 'Sr', 'Inc', 'Ph.D', 'Phd',
 #   categories_use_field_for_author_name = 'author_sort'
 categories_use_field_for_author_name = 'author'
 
+#: Completion sort order: choose when to change from lexicographic to ASCII-like
+# Calibre normally uses locale-dependent lexicographic ordering when showing
+# completion values. This means that the sort order is correct for the user's
+# language. However, this can be slow. Performance is improved by switching to
+# ascii ordering. This tweak controls when that switch happens. Set it to zero
+# to always use ascii ordering. Set it to something larger than zero to switch
+# to ascii ordering for performance reasons.
+completion_change_to_ascii_sorting = 2500
+
 #: Control partitioning of Tag Browser
 # When partitioning the tags browser, the format of the subcategory label is
 # controlled by a template: categories_collapsed_name_template if sorting by
@@ -93,7 +101,6 @@ categories_collapsed_name_template = r'{first.sort:shorten(4,,0)} - {last.sort:s
 categories_collapsed_rating_template = r'{first.avg_rating:4.2f:ifempty(0)} - {last.avg_rating:4.2f:ifempty(0)}'
 categories_collapsed_popularity_template = r'{first.count:d} - {last.count:d}'
 
-
 #: Specify columns to sort the booklist by on startup
 # Provide a set of columns to be sorted on when calibre starts
 #  The argument is None if saved sort history is to be used
@@ -244,17 +251,14 @@ sony_collection_name_template='{value}{category:| (|)}'
 # Default: empty (no rules), so no collection attributes are named.
 sony_collection_sorting_rules = []
 
-
 #: Control how tags are applied when copying books to another library
 # Set this to True to ensure that tags in 'Tags to add when adding
 # a book' are added when copying books to another library
 add_new_book_tags_when_importing_books = False
 
-
 #: Set the maximum number of tags to show per book in the content server
 max_content_server_tags_shown=5
 
-
 #: Set custom metadata fields that the content server will or will not display.
 # content_server_will_display is a list of custom fields to be displayed.
 # content_server_wont_display is a list of custom fields not to be displayed.
@@ -296,7 +300,6 @@ generate_cover_foot_font = None
 # Example: doubleclick_on_library_view = 'do_nothing'
 doubleclick_on_library_view = 'open_viewer'
 
-
 #: Language to use when sorting.
 # Setting this tweak will force sorting to use the
 # collating order for the specified language. This might be useful if you run

src/calibre/gui2/complete.py

@@ -12,11 +12,10 @@ from PyQt4.Qt import QLineEdit, QAbstractListModel, Qt, \
 from calibre.utils.icu import sort_key, lower
 from calibre.gui2 import NONE
 from calibre.gui2.widgets import EnComboBox, LineEditECM
+from calibre.utils.config_base import tweaks
 
 class CompleteModel(QAbstractListModel):
 
-    MAX_LEX_SORT_ITEMS = 5000
-
     def __init__(self, parent=None):
         QAbstractListModel.__init__(self, parent)
         self.items = []
@@ -24,7 +23,7 @@ class CompleteModel(QAbstractListModel):
 
     def set_items(self, items):
         items = [unicode(x.strip()) for x in items]
-        if len(items) < self.MAX_LEX_SORT_ITEMS:
+        if len(items) < tweaks['completion_change_to_ascii_sorting']:
             self.items = sorted(items, key=lambda x: sort_key(x))
             self.sorting = QCompleter.UnsortedModel
         else: