Fix problems with restrictions when changing libraries:

- restrictions box is not reloaded
- counts are not correct

Add tweak to set restriction at calibre startup

resources/default_tweaks.py

@@ -80,3 +80,8 @@ title_series_sorting = 'library_order'
 # strictly_alphabetic, it would remain "The Client".
 save_template_title_series_sorting = 'library_order'
 
+# Specify a restriction to apply when calibre starts or when change library is
+# used. Provide the name of a saved search. It is ignored if the saved search
+# does not exist in the library being opened. The value '' means no restriction.
+restrict_at_startup = ''
+

src/calibre/gui2/search_box.py

@@ -382,8 +382,7 @@ class SearchBoxMixin(object):
 
 class SavedSearchBoxMixin(object):
 
-    def __init__(self, db):
-        self.db = db
+    def __init__(self):
         self.connect(self.saved_search, SIGNAL('changed()'), self.saved_searches_changed)
         self.saved_searches_changed()
         self.connect(self.clear_button, SIGNAL('clicked()'), self.saved_search.clear_to_help)
@@ -402,10 +401,6 @@ class SavedSearchBoxMixin(object):
             b = getattr(self, x+'_search_button')
             b.setStatusTip(b.toolTip())
 
-    def set_database(self, db):
-        self.db = db
-        self.saved_searches_changed()
-
     def saved_searches_changed(self):
         p = saved_searches().names()
         p.sort()
@@ -415,13 +410,8 @@ class SavedSearchBoxMixin(object):
         self.tags_view.recount()
         for s in p:
             self.search_restriction.addItem(s)
-        if t:
-            if t in p: # redo the current restriction, if there was one
-                self.search_restriction.setCurrentIndex(self.search_restriction.findText(t))
-                # self.tags_view.set_search_restriction(t)
-            else:
-                self.search_restriction.setCurrentIndex(0)
-                self.apply_search_restriction('')
+        if t: # redo the search restriction if there was one
+            self.apply_named_search_restriction(t)
 
     def do_saved_search_edit(self, search):
         d = SavedSearchEditor(self, search)

src/calibre/gui2/search_restriction_mixin.py

@@ -29,6 +29,16 @@ class SearchRestrictionMixin(object):
         if self.restriction_in_effect:
             self.set_number_of_books_shown()
 
+    def apply_named_search_restriction(self, name):
+        if not name:
+            r = 0
+        else:
+            r = self.search_restriction.findText(name)
+            if r < 0:
+                r = 0
+        self.search_restriction.setCurrentIndex(r)
+        self.apply_search_restriction(r)
+
     def apply_search_restriction(self, i):
         r = unicode(self.search_restriction.currentText())
         if r is not None and r != '':

src/calibre/gui2/ui.py

@@ -21,7 +21,7 @@ from PyQt4.Qt import Qt, SIGNAL, QTimer, \
 from calibre import  prints
 from calibre.constants import __appname__, isosx
 from calibre.ptempfile import PersistentTemporaryFile
-from calibre.utils.config import prefs, dynamic
+from calibre.utils.config import prefs, dynamic, tweaks
 from calibre.utils.ipc.server import Server
 from calibre.library.database2 import LibraryDatabase2
 from calibre.customize.ui import interface_actions
@@ -195,7 +195,7 @@ class Main(MainWindow, MainWindowMixin, DeviceMixin, # {{{
         UpdateMixin.__init__(self, opts)
 
         ####################### Search boxes ########################
-        SavedSearchBoxMixin.__init__(self, db)
+        SavedSearchBoxMixin.__init__(self)
         SearchBoxMixin.__init__(self)
 
         ####################### Library view ########################
@@ -230,6 +230,8 @@ class Main(MainWindow, MainWindowMixin, DeviceMixin, # {{{
 
         ######################### Search Restriction ##########################
         SearchRestrictionMixin.__init__(self)
+        if tweaks['restrict_at_startup']:
+            self.apply_named_search_restriction(tweaks['restrict_at_startup'])
 
         ########################### Cover Flow ################################
 
@@ -371,6 +373,10 @@ class Main(MainWindow, MainWindowMixin, DeviceMixin, # {{{
         for action in self.iactions.values():
             action.library_changed(db)
         self.set_window_title()
+        self.apply_named_search_restriction('') # reset restriction to null
+        self.saved_searches_changed() # reload the search restrictions combo box
+        if tweaks['restrict_at_startup']:
+            self.apply_named_search_restriction(tweaks['restrict_at_startup'])
 
     def set_window_title(self):
         self.setWindowTitle(__appname__ + u' - ||%s||'%self.iactions['Choose Library'].library_name())