From 6eaa75527b5754cfbb8df833ad3375b724d51cfd Mon Sep 17 00:00:00 2001
From: Charles Haley <>
Date: Sat, 11 Sep 2010 21:01:26 +0100
Subject: [PATCH] resort maximum_resort_levels tweak implemented

---
 resources/default_tweaks.py        | 7 +++++++
 src/calibre/gui2/library/models.py | 4 ++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/resources/default_tweaks.py b/resources/default_tweaks.py
index 66ee4d1471..9d9bc7651c 100644
--- a/resources/default_tweaks.py
+++ b/resources/default_tweaks.py
@@ -114,3 +114,10 @@ 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 the maximum number of sort 'levels' that calibre will use to resort the
+# library after certain operations such as searches or device insertion. Each
+# sort level adds a performance penalty. If the database is large (thousands of
+# books) the penalty might be noticeable. If you are not concerned about multi-
+# level sorts, and if you are seeing a slowdown, reduce the value of this tweak.
+maximum_resort_levels = 5
\ No newline at end of file
diff --git a/src/calibre/gui2/library/models.py b/src/calibre/gui2/library/models.py
index 8ad0cd6818..d2f38cc0a1 100644
--- a/src/calibre/gui2/library/models.py
+++ b/src/calibre/gui2/library/models.py
@@ -266,8 +266,8 @@ class BooksModel(QAbstractTableModel): # {{{
         self.db.refresh(field=None)
         self.resort(reset=reset)
 
-    def resort(self, reset=True, history=5): # Bug report needed history=4 :)
-        for col,ord in reversed(self.sort_history[:history]):
+    def resort(self, reset=True):
+        for col,ord in reversed(self.sort_history[:tweaks['maximum_resort_levels']]):
             try:
                 col = self.column_map.index(col)
             except ValueError: