Merge from trunk

Changelog.yaml

@@ -4,6 +4,72 @@
 # for important features/bug fixes.
 # Also, each release can have new and improved recipes.
 
+- version: 0.7.9
+  date: 2010-07-17
+
+  new features:
+    - title: "New unified toolbar"
+      type: major
+      description: >
+        "A new unified toolbar combines the old toolbar and device display, to save space. Now when a device is connected, buttons 
+        are created in the unified toolbar for the device and its storage cards. Click the arrow next to the button to eject the device."
+
+    - title: "Device drivers: Add option to allow calibre to automatically manage metadata on the device in Preferences->Add/Save->Sending to device"
+
+    - title: "BibTeX output for catalogs. The list of books in calibre can now also be output as a .bib file"
+
+    - title: "A new toolbar button to choose/create different calibre libraries. Be careful using it if you also use custom columns."
+
+    - title: "Support for the MiBuk"
+
+  bug fixes:
+    - title: "MOBI metadata: Replace HTML entities in the title read from the MOBI file"
+
+    - title: "Conversion pipeline: Handle elements with percentage sizes that are children of zero size parents correctly."
+      tickets: [6155]
+
+    - title: "Fix regression that made LRF conversion less robust"
+      tickets: [6180]
+
+    - title: "FB2 Input: Handle embedded images correctly, so that EPUB generated from FB2 works with Adobe Digital Editions."
+      tickets: [6183]
+
+    - title: "Fix regression that prevented old news from being deleted in the calibre library if calibre is never kept running for more than an hour"
+
+    - title: "RTF Input: Fix handling of text align and superscript/subscripts"
+      tickets: [3644,5060]
+
+    - title: "Fix long series or publisher names causing convert dialog to become too wide"
+
+    - title: "SONY driver: Fix handling of invalid XML databases with null bytes"
+      tickets: [6165]
+
+    - title: "iTunes driver: Better series_index sorting"
+
+    - title: "Improved editing of dates for custom columns"
+
+    - title: "Linux USB scanner: Don't fail to start calibre if SYFS is not present. Instead simply fail to detect devices"
+      tickets: [6156]
+
+    - title: "Android driver: Show books on device if Aldiko is being used"
+      tickets: [6100]
+
+    - title: "Upgrade to Qt 4.6.3 in all binary builds to ensure proper rendering of the new toolbar icons"
+
+    - title: "Fix handling of entities in epub files by the epub-fix command"
+      tickets: [6136]
+
+  new recipes:
+    - title: "EL Pain Impresso"
+      author: Darko Miletic
+
+    - title: "MIT Technology Review, Alternet, Waco Tribune Herald and Orlando Sentinel"
+      author: rty
+
+  improved recipes:
+    - Google Reader
+
+
 - version: 0.7.8
   date: 2010-07-09
 

src/calibre/__init__.py

@@ -440,6 +440,9 @@ xml_entity_to_unicode = partial(entity_to_unicode, result_exceptions = {
     '>' : '>',
     '&' : '&'})
 
+def replace_entities(raw):
+    return _ent_pat.sub(entity_to_unicode, raw)
+
 def prepare_string_for_xml(raw, attribute=False):
     raw = _ent_pat.sub(entity_to_unicode, raw)
     raw = raw.replace('&', '&amp;').replace('<', '&lt;').replace('>', '&gt;')

src/calibre/constants.py

@@ -2,7 +2,7 @@ __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
 __appname__   = 'calibre'
-__version__   = '0.7.8'
+__version__   = '0.7.9'
 __author__    = "Kovid Goyal <kovid@kovidgoyal.net>"
 
 import re

src/calibre/ebooks/fb2/input.py

@@ -60,6 +60,9 @@ class FB2Input(InputFormatPlugin):
 
         transform = etree.XSLT(styledoc)
         result = transform(doc)
+        for img in result.xpath('//img[@src]'):
+            src = img.get('src')
+            img.set('src', self.binary_map.get(src, src))
         open('index.xhtml', 'wb').write(transform.tostring(result))
         stream.seek(0)
         mi = get_metadata(stream, 'fb2')
@@ -83,9 +86,15 @@ class FB2Input(InputFormatPlugin):
         return os.path.join(os.getcwd(), 'metadata.opf')
 
     def extract_embedded_content(self, doc):
+        self.binary_map = {}
         for elem in doc.xpath('./*'):
             if 'binary' in elem.tag and elem.attrib.has_key('id'):
+                ct = elem.get('content-type', '')
                 fname = elem.attrib['id']
+                ext = ct.rpartition('/')[-1].lower()
+                if ext in ('png', 'jpeg', 'jpg'):
+                    fname += '.' + ext
+                    self.binary_map[elem.get('id')] = fname
                 data = b64decode(elem.text.strip())
                 open(fname, 'wb').write(data)
 

src/calibre/ebooks/lrf/input.py

@@ -368,7 +368,15 @@ class LRFInput(InputFormatPlugin):
         if options.verbose > 2:
             open('lrs.xml', 'wb').write(xml.encode('utf-8'))
         parser = etree.XMLParser(no_network=True, huge_tree=True)
-        doc = etree.fromstring(xml, parser=parser)
+        try:
+            doc = etree.fromstring(xml, parser=parser)
+        except:
+            self.log.warn('Failed to parse XML. Trying to recover')
+            parser = etree.XMLParser(no_network=True, huge_tree=True,
+                    recover=True)
+            doc = etree.fromstring(xml, parser=parser)
+
+
         char_button_map = {}
         for x in doc.xpath('//CharButton[@refobj]'):
             ro = x.get('refobj')

src/calibre/ebooks/mobi/reader.py

@@ -14,7 +14,8 @@ except ImportError:
 
 from lxml import html, etree
 
-from calibre import xml_entity_to_unicode, CurrentDir, entity_to_unicode
+from calibre import xml_entity_to_unicode, CurrentDir, entity_to_unicode, \
+    replace_entities
 from calibre.utils.filenames import ascii_filename
 from calibre.utils.date import parse_date
 from calibre.ptempfile import TemporaryDirectory
@@ -70,7 +71,7 @@ class EXTHHeader(object):
             #else:
             #    print 'unknown record', id, repr(content)
         if title:
-            self.mi.title = title
+            self.mi.title = replace_entities(title)
 
     def process_metadata(self, id, content, codec):
         if id == 100:

src/calibre/ebooks/oeb/stylizer.py

@@ -475,7 +475,8 @@ class Style(object):
             value = float(m.group(1))
             unit = m.group(2)
             if unit == '%':
-                base = base or self.width
+                if base is None:
+                    base = self.width
                 result = (value / 100.0) * base
             elif unit == 'px':
                 result = value * 72.0 / self._profile.dpi

src/calibre/gui2/convert/structure_detection.ui

@@ -58,7 +58,7 @@
    <item row="9" column="0" colspan="2">
     <widget class="XPathEdit" name="opt_page_breaks_before" native="true"/>
    </item>
-   <item row="10" column="0">
+   <item row="10" column="0" colspan="2">
     <spacer name="verticalSpacer">
      <property name="orientation">
       <enum>Qt::Vertical</enum>

src/calibre/gui2/convert/xexp_edit.ui

@@ -43,12 +43,6 @@
          <height>0</height>
         </size>
        </property>
-       <property name="maximumSize">
-        <size>
-         <width>500</width>
-         <height>16777215</height>
-        </size>
-       </property>
        <property name="minimumContentsLength">
         <number>30</number>
        </property>

src/calibre/gui2/dialogs/choose_library.py

@@ -10,7 +10,7 @@ import os
 from PyQt4.Qt import QDialog
 
 from calibre.gui2.dialogs.choose_library_ui import Ui_Dialog
-from calibre.gui2 import error_dialog, choose_dir
+from calibre.gui2 import error_dialog, choose_dir, warning_dialog
 from calibre.constants import filesystem_encoding
 from calibre import isbytestring, patheq
 from calibre.utils.config import prefs
@@ -24,6 +24,7 @@ class ChooseLibrary(QDialog, Ui_Dialog):
         self.db = db
         self.new_db = None
         self.callback = callback
+        self.location.initialize('choose_library_dialog')
 
         lp = db.library_path
         if isbytestring(lp):
@@ -61,6 +62,12 @@ class ChooseLibrary(QDialog, Ui_Dialog):
         return True
 
     def perform_action(self, ac, loc):
+        if ac in ('new', 'existing'):
+            warning_dialog(self.parent(), _('Custom columns'),
+                    _('If you use custom columns and they differ between '
+                        'libraries, you will have various problems. Best '
+                        'to ensure you have the same custom columns in each '
+                        'library.'), show=True)
         if ac in ('new', 'existing'):
             prefs['library_path'] = loc
             self.callback(loc)
@@ -79,4 +86,5 @@ class ChooseLibrary(QDialog, Ui_Dialog):
                 loc):
             return
         QDialog.accept(self)
+        self.location.save_history()
         self.perform_action(action, loc)

src/calibre/gui2/dialogs/choose_library.ui

@@ -18,7 +18,7 @@
     <normaloff>:/images/lt.png</normaloff>:/images/lt.png</iconset>
   </property>
   <layout class="QGridLayout" name="gridLayout">
-   <item row="0" column="0" colspan="3">
+   <item row="0" column="0" colspan="4">
     <widget class="QLabel" name="old_location">
      <property name="text">
       <string>Your calibre library is currently located at {0}</string>
@@ -38,14 +38,7 @@
      </property>
     </widget>
    </item>
-   <item row="2" column="1">
+   <item row="4" column="0" colspan="4">
-    <widget class="QLineEdit" name="location">
-     <property name="readOnly">
-      <bool>true</bool>
-     </property>
-    </widget>
-   </item>
-   <item row="4" column="0" colspan="3">
     <widget class="QRadioButton" name="existing_library">
      <property name="text">
       <string>Use &amp;existing library at the new location</string>
@@ -55,21 +48,21 @@
      </property>
     </widget>
    </item>
-   <item row="5" column="0" colspan="2">
+   <item row="5" column="0" colspan="3">
     <widget class="QRadioButton" name="empty_library">
      <property name="text">
       <string>&amp;Create an empty library at the new location</string>
      </property>
     </widget>
    </item>
-   <item row="6" column="0" colspan="2">
+   <item row="6" column="0" colspan="3">
     <widget class="QRadioButton" name="move_library">
      <property name="text">
       <string>&amp;Move current library to new location</string>
      </property>
     </widget>
    </item>
-   <item row="8" column="1">
+   <item row="8" column="2">
     <widget class="QDialogButtonBox" name="buttonBox">
      <property name="orientation">
       <enum>Qt::Horizontal</enum>
@@ -79,7 +72,7 @@
      </property>
     </widget>
    </item>
-   <item row="7" column="1">
+   <item row="7" column="2">
     <spacer name="verticalSpacer">
      <property name="orientation">
       <enum>Qt::Vertical</enum>
@@ -118,7 +111,7 @@
      </property>
     </spacer>
    </item>
-   <item row="2" column="2">
+   <item row="2" column="3">
     <widget class="QToolButton" name="browse_button">
      <property name="text">
       <string>...</string>
@@ -129,8 +122,18 @@
      </property>
     </widget>
    </item>
+   <item row="2" column="1" colspan="2">
+    <widget class="HistoryLineEdit" name="location"/>
+   </item>
   </layout>
  </widget>
+ <customwidgets>
+  <customwidget>
+   <class>HistoryLineEdit</class>
+   <extends>QComboBox</extends>
+   <header>calibre/gui2/widgets.h</header>
+  </customwidget>
+ </customwidgets>
  <resources>
   <include location="../../../../resources/images.qrc"/>
  </resources>

src/calibre/gui2/dialogs/jobs.ui

@@ -60,7 +60,7 @@
    <item>
     <widget class="QPushButton" name="stop_all_jobs_button">
      <property name="text">
-      <string>Stop &amp;all jobs</string>
+      <string>Stop &amp;all non device jobs</string>
      </property>
     </widget>
    </item>

src/calibre/gui2/dialogs/scheduler.py

@@ -10,7 +10,7 @@ Scheduler for automated recipe downloads
 from datetime import timedelta
 
 from PyQt4.Qt import QDialog, SIGNAL, Qt, QTime, QObject, QMenu, \
-        QAction, QIcon, QMutex, QTimer
+        QAction, QIcon, QMutex, QTimer, pyqtSignal
 
 from calibre.gui2.dialogs.scheduler_ui import Ui_Dialog
 from calibre.gui2.search_box import SearchBox2
@@ -203,6 +203,9 @@ class Scheduler(QObject):
 
     INTERVAL = 1 # minutes
 
+    delete_old_news = pyqtSignal(object)
+    start_recipe_fetch = pyqtSignal(object)
+
     def __init__(self, parent, db):
         QObject.__init__(self, parent)
         self.internet_connection_failed = False
@@ -225,20 +228,23 @@ class Scheduler(QObject):
                 self.download_all_scheduled)
 
         self.timer = QTimer(self)
-        self.timer.start(int(self.INTERVAL * 60000))
+        self.timer.start(int(self.INTERVAL * 60 * 1000))
         self.oldest_timer = QTimer()
         self.connect(self.oldest_timer, SIGNAL('timeout()'), self.oldest_check)
         self.connect(self.timer, SIGNAL('timeout()'), self.check)
         self.oldest = gconf['oldest_news']
-        self.oldest_timer.start(int(60 * 60000))
+        self.oldest_timer.start(int(60 * 60 * 1000))
-        self.oldest_check()
+        QTimer.singleShot(5 * 1000, self.oldest_check)
+        self.database_changed = self.recipe_model.database_changed
 
     def oldest_check(self):
         if self.oldest > 0:
             delta = timedelta(days=self.oldest)
             ids = self.recipe_model.db.tags_older_than(_('News'), delta)
             if ids:
-                self.emit(SIGNAL('delete_old_news(PyQt_PyObject)'), ids)
+                ids = list(ids)
+                if ids:
+                    self.delete_old_news.emit(ids)
 
     def show_dialog(self, *args):
         self.lock.lock()
@@ -282,7 +288,7 @@ class Scheduler(QObject):
                     'urn':urn,
                    }
             self.download_queue.add(urn)
-            self.emit(SIGNAL('start_recipe_fetch(PyQt_PyObject)'), arg)
+            self.start_recipe_fetch.emit(arg)
         finally:
             self.lock.unlock()
 

src/calibre/gui2/layout.py

@@ -21,6 +21,7 @@ from calibre.gui2.widgets import ComboBoxWithHelp
 from calibre import human_readable
 from calibre.utils.config import prefs
 from calibre.ebooks import BOOK_EXTENSIONS
+from calibre.gui2.dialogs.scheduler import Scheduler
 
 ICON_SIZE = 48
 
@@ -83,7 +84,7 @@ class LocationManager(QObject): # {{{
 
         ac('library', _('Library'), 'lt.png',
                 _('Show books in calibre library'))
-        ac('main', _('Main'), 'reader.svg',
+        ac('main', _('Reader'), 'reader.svg',
                 _('Show books in the main memory of the device'))
         ac('carda', _('Card A'), 'sd.svg',
                 _('Show books in storage card A'))
@@ -307,7 +308,7 @@ class Action(QAction):
 
 class MainWindowMixin(object):
 
-    def __init__(self):
+    def __init__(self, db):
         self.device_connected = None
         self.setObjectName('MainWindow')
         self.setWindowIcon(QIcon(I('library.png')))
@@ -323,6 +324,7 @@ class MainWindowMixin(object):
         self.donate_button.set_normal_icon_size(ICON_SIZE, ICON_SIZE)
         self.location_manager = LocationManager(self)
 
+        self.init_scheduler(db)
         all_actions = self.setup_actions()
 
         self.search_bar = SearchBar(self)
@@ -334,6 +336,11 @@ class MainWindowMixin(object):
         l = self.centralwidget.layout()
         l.addWidget(self.search_bar)
 
+    def init_scheduler(self, db):
+        self.scheduler = Scheduler(self, db)
+        self.scheduler.start_recipe_fetch.connect(
+                self.download_scheduled_recipe, type=Qt.QueuedConnection)
+
 
     def read_toolbar_settings(self):
         pass
@@ -392,6 +399,10 @@ class MainWindowMixin(object):
         ac(-1, -1, 0, 'books_with_the_same_tags', _('Books with the same tags'),
                 'tags.svg')
 
+        self.action_news.setMenu(self.scheduler.news_menu)
+        self.action_news.triggered.connect(
+                self.scheduler.show_dialog)
+
         self.action_help.triggered.connect(self.show_help)
         md = QMenu()
         md.addAction(_('Edit metadata individually'),

src/calibre/gui2/library/views.py

@@ -218,9 +218,10 @@ class BooksView(QTableView): # {{{
         # Only save if we have been initialized (set_database called)
         if len(self.column_map) > 0 and self.was_restored:
             state = self.get_state()
+            db = getattr(self.model(), 'db', None)
             name = unicode(self.objectName())
-            if name:
+            if name and db is not None:
-                gprefs.set(name + ' books view state', state)
+                db.prefs.set(name + ' books view state', state)
 
     def cleanup_sort_history(self, sort_history):
         history = []
@@ -298,11 +299,27 @@ class BooksView(QTableView): # {{{
                     old_state['column_sizes'][name] += 12
         return old_state
 
-    def restore_state(self):
+    def get_old_state(self):
+        ans = None
         name = unicode(self.objectName())
-        old_state = None
         if name:
-            old_state = gprefs.get(name + ' books view state', None)
+            name += ' books view state'
+            db = getattr(self.model(), 'db', None)
+            if db is not None:
+                ans = db.prefs.get(name, None)
+                if ans is None:
+                    ans = gprefs.get(name, None)
+                    try:
+                        del gprefs[name]
+                    except:
+                        pass
+                    if ans is not None:
+                        db.prefs[name] = ans
+        return ans
+
+
+    def restore_state(self):
+        old_state = self.get_old_state()
         if old_state is None:
             old_state = self.get_default_state()
 

src/calibre/gui2/ui.py

@@ -27,7 +27,6 @@ from calibre.gui2 import error_dialog, GetMetadata, open_local_file, \
         gprefs, max_available_height, config, info_dialog
 from calibre.gui2.cover_flow import CoverFlowMixin
 from calibre.gui2.widgets import ProgressIndicator
-from calibre.gui2.dialogs.scheduler import Scheduler
 from calibre.gui2.update import UpdateMixin
 from calibre.gui2.main_window import MainWindow
 from calibre.gui2.layout import MainWindowMixin
@@ -119,7 +118,7 @@ class Main(MainWindow, MainWindowMixin, DeviceMixin, # {{{
                 self.another_instance_wants_to_talk)
         self.check_messages_timer.start(1000)
 
-        MainWindowMixin.__init__(self)
+        MainWindowMixin.__init__(self, db)
 
         # Jobs Button {{{
         self.job_manager = JobManager()
@@ -253,18 +252,6 @@ class Main(MainWindow, MainWindowMixin, DeviceMixin, # {{{
                     db, server_config().parse())
             self.test_server_timer = QTimer.singleShot(10000, self.test_server)
 
-
-        self.scheduler = Scheduler(self, self.library_view.model().db)
-        self.action_news.setMenu(self.scheduler.news_menu)
-        self.connect(self.action_news, SIGNAL('triggered(bool)'),
-                self.scheduler.show_dialog)
-        self.connect(self.scheduler, SIGNAL('delete_old_news(PyQt_PyObject)'),
-                self.library_view.model().delete_books_by_id,
-                Qt.QueuedConnection)
-        self.connect(self.scheduler,
-                SIGNAL('start_recipe_fetch(PyQt_PyObject)'),
-                self.download_scheduled_recipe, Qt.QueuedConnection)
-
         self.keyboard_interrupt.connect(self.quit, type=Qt.QueuedConnection)
         AddAction.__init__(self)
 
@@ -272,6 +259,11 @@ class Main(MainWindow, MainWindowMixin, DeviceMixin, # {{{
         self.finalize_layout()
         self.donate_button.start_animation()
 
+        self.scheduler.delete_old_news.connect(
+                self.library_view.model().delete_books_by_id,
+                type=Qt.QueuedConnection)
+
+
     def resizeEvent(self, ev):
         MainWindow.resizeEvent(self, ev)
         self.search.setMaximumWidth(self.width()-150)
@@ -402,6 +394,7 @@ class Main(MainWindow, MainWindowMixin, DeviceMixin, # {{{
         self.search.clear_to_help()
         self.book_details.reset_info()
         self.library_view.model().count_changed()
+        self.scheduler.database_changed(db)
         prefs['library_path'] = self.library_path
 
     def show_book_info(self, *args):

src/calibre/library/database2.py

@@ -19,6 +19,7 @@ from calibre.library.schema_upgrades import SchemaUpgrade
 from calibre.library.caches import ResultCache
 from calibre.library.custom_columns import CustomColumns
 from calibre.library.sqlite import connect, IntegrityError, DBThread
+from calibre.library.prefs import DBPrefs
 from calibre.ebooks.metadata import string_to_authors, authors_to_string, \
                                     MetaInformation
 from calibre.ebooks.metadata.meta import get_metadata, metadata_from_formats
@@ -140,6 +141,7 @@ class LibraryDatabase2(LibraryDatabase, SchemaUpgrade, CustomColumns):
         self.initialize_dynamic()
 
     def initialize_dynamic(self):
+        self.prefs = DBPrefs(self)
         self.conn.executescript('''
         DROP TRIGGER IF EXISTS author_insert_trg;
         CREATE TEMP TRIGGER author_insert_trg

src/calibre/library/prefs.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+# vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
+
+__license__   = 'GPL v3'
+__copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
+__docformat__ = 'restructuredtext en'
+
+import json
+
+from calibre.constants import preferred_encoding
+from calibre.utils.config import to_json, from_json
+
+class DBPrefs(dict):
+
+    def __init__(self, db):
+        dict.__init__(self)
+        self.db = db
+        for key, val in self.db.conn.get('SELECT key,val FROM preferences'):
+            val = self.raw_to_object(val)
+            dict.__setitem__(self, key, val)
+
+    def raw_to_object(self, raw):
+        if not isinstance(raw, unicode):
+            raw = raw.decode(preferred_encoding)
+        return json.loads(raw, object_hook=from_json)
+
+    def to_raw(self, val):
+        return json.dumps(val, indent=2, default=to_json)
+
+    def __getitem__(self, key):
+        return dict.__getitem__(self, key)
+
+    def __delitem__(self, key):
+        dict.__delitem__(self, key)
+        self.db.conn.execute('DELETE FROM preferences WHERE key=?', (key,))
+        self.db.conn.commit()
+
+    def __setitem__(self, key, val):
+        raw = self.to_raw(val)
+        self.db.conn.execute('DELETE FROM preferences WHERE key=?', (key,))
+        self.db.conn.execute('INSERT INTO preferences (key,val) VALUES (?,?)', (key,
+            raw))
+        self.db.conn.commit()
+        dict.__setitem__(self, key, val)
+
+    def set(self, key, val):
+        self.__setitem__(key, val)
+
+

src/calibre/library/schema_upgrades.py

@@ -387,3 +387,14 @@ class SchemaUpgrade(object):
 
         self.conn.execute('UPDATE authors SET sort=author_to_author_sort(name)')
 
+    def upgrade_version_12(self):
+        'DB based preference store'
+        script = '''
+        DROP TABLE IF EXISTS preferences;
+        CREATE TABLE preferences(id INTEGER PRIMARY KEY,
+                                 key TEXT NON NULL,
+                                 val TEXT NON NULL,
+                                 UNIQUE(key));
+        '''
+        self.conn.executescript(script)
+

src/calibre/utils/PythonMagickWand.py

@@ -66,7 +66,7 @@ and save it to a new file.
 
 
 """
-import ctypes, sys, os
+import ctypes, sys, os, glob
 from ctypes import util
 iswindows = 'win32' in sys.platform or 'win64' in sys.platform
 isosx     = 'darwin' in sys.platform
@@ -85,7 +85,8 @@ elif iswindows:
     _lib = flib if isfrozen else 'CORE_RL_wand_'
 else:
     if isfrozen:
-        _lib = os.path.join(sys.frozen_path, 'libMagickWand.so.2')
+        _lib = glob.glob(os.path.join(sys.frozen_path,
+            'libMagickWand.so.*'))[-1]
     else:
         _lib = util.find_library('MagickWand')
         if _lib is None:

src/calibre/utils/config.py

@@ -6,15 +6,16 @@ __docformat__ = 'restructuredtext en'
 '''
 Manage application-wide preferences.
 '''
-import os, re, cPickle, textwrap, traceback, plistlib, json, base64
+import os, re, cPickle, textwrap, traceback, plistlib, json, base64, datetime
 from copy import deepcopy
 from functools import partial
 from optparse import OptionParser as _OptionParser
 from optparse import IndentedHelpFormatter
+from collections import defaultdict
+
 from calibre.constants import terminal_controller, iswindows, isosx, \
                               __appname__, __version__, __author__, plugins
 from calibre.utils.lock import LockError, ExclusiveFile
-from collections import defaultdict
 
 if os.environ.has_key('CALIBRE_CONFIG_DIRECTORY'):
     config_dir = os.path.abspath(os.environ['CALIBRE_CONFIG_DIRECTORY'])
@@ -632,27 +633,34 @@ class XMLConfig(dict):
                 f.truncate()
                 f.write(raw)
 
+def to_json(obj):
+    if isinstance(obj, bytearray):
+        return {'__class__': 'bytearray',
+                '__value__': base64.standard_b64encode(bytes(obj))}
+    if isinstance(obj, datetime.datetime):
+        from calibre.utils.date import isoformat
+        return {'__class__': 'datetime.datetime',
+                '__value__': isoformat(obj, as_utc=True)}
+    raise TypeError(repr(obj) + ' is not JSON serializable')
+
+def from_json(obj):
+    if '__class__' in obj:
+        if obj['__class__'] == 'bytearray':
+            return bytearray(base64.standard_b64decode(obj['__value__']))
+        if obj['__class__'] == 'datetime.datetime':
+            from calibre.utils.date import parse_date
+            return parse_date(obj['__value__'], assume_utc=True)
+    return obj
+
 class JSONConfig(XMLConfig):
 
     EXTENSION = '.json'
 
-    def to_json(self, obj):
-        if isinstance(obj, bytearray):
-            return {'__class__': 'bytearray',
-                    '__value__': base64.standard_b64encode(bytes(obj))}
-        raise TypeError(repr(obj) + ' is not JSON serializable')
-
-    def from_json(self, obj):
-        if '__class__' in obj:
-            if obj['__class__'] == 'bytearray':
-                return bytearray(base64.standard_b64decode(obj['__value__']))
-        return obj
-
     def raw_to_object(self, raw):
-        return json.loads(raw.decode('utf-8'), object_hook=self.from_json)
+        return json.loads(raw.decode('utf-8'), object_hook=from_json)
 
     def to_raw(self):
-        return json.dumps(self, indent=2, default=self.to_json)
+        return json.dumps(self, indent=2, default=to_json)
 
     def __getitem__(self, key):
         return dict.__getitem__(self, key)

src/calibre/web/feeds/recipes/model.py

@@ -9,7 +9,7 @@ __docformat__ = 'restructuredtext en'
 import os, copy
 
 from PyQt4.Qt import QAbstractItemModel, QVariant, Qt, QColor, QFont, QIcon, \
-        QModelIndex, SIGNAL
+        QModelIndex, SIGNAL, QMetaObject, pyqtSlot
 
 from calibre.utils.search_query_parser import SearchQueryParser
 from calibre.gui2 import NONE
@@ -131,6 +131,16 @@ class RecipeModel(QAbstractItemModel, SearchQueryParser):
         self.scheduler_config = SchedulerConfig()
         self.do_refresh()
 
+    @pyqtSlot()
+    def do_database_change(self):
+        self.db = self.newdb
+        self.newdb = None
+        self.do_refresh()
+
+    def database_changed(self, db):
+        self.newdb = db
+        QMetaObject.invokeMethod(self, 'do_database_change', Qt.QueuedConnection)
+
     def get_builtin_recipe(self, urn, download=True):
         if download:
             try: