Add a 'search limit' feature where the user can specify a set of fields (columns) to search when non-prefixed terms are used

src/calibre/gui2/layout.py

@@ -202,6 +202,15 @@ class SearchBar(QWidget): # {{{
         l.addWidget(x)
         x.setVisible(False)
 
+        x = parent.search_limit_to = QCheckBox()
+        x.setText(_('&Limit'))
+        x.setToolTip('<p>'+_('When searching for text without using lookup '
+            'prefixes, as for example someword instead of title:someword, '
+            'limit the columns searched to those named in the option '
+            'Preferences -> Look and Feel -> Limit non-prefixed searches to columns.'))
+        x.setVisible(False)
+        l.addWidget(x)
+
         x = parent.saved_search = SavedSearchBox(self)
         x.setMaximumSize(QSize(150, 16777215))
         x.setMinimumContentsLength(15)

src/calibre/gui2/preferences/look_feel.py

@@ -62,6 +62,8 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
         r('tags_browser_partition_method', gprefs, choices=choices)
         r('tags_browser_collapse_at', gprefs)
 
+        r('search_box_limit_to', prefs)
+
         self.current_font = None
         self.change_font_button.clicked.connect(self.change_font)
 
@@ -119,6 +121,7 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
         gui.search.search_as_you_type(config['search_as_you_type'])
         self.update_font_display()
         gui.tags_view.reread_collapse_parameters()
+        gui.search_limit_to.setEnabled(bool(prefs['search_box_limit_to']))
 
 if __name__ == '__main__':
     app = QApplication([])

src/calibre/gui2/preferences/look_feel.ui

@@ -200,6 +200,26 @@ up into sub-categories. If the partition method is set to disable, this value is
      </item>
     </layout>
    </item>
+   <item row="8" column="0">
+    <widget class="QLabel" name="label_81">
+     <property name="text">
+      <string>Limit non-&amp;prefixed searches to columns:</string>
+     </property>
+     <property name="buddy">
+      <cstring>opt_search_box_limit_to</cstring>
+     </property>
+    </widget>
+   </item>
+   <item row="8" column="1">
+    <widget class="QLineEdit" name="opt_search_box_limit_to">
+     <property name="toolTip">
+      <string>Choose columns to be searched when not using prefixes, as for
+example when searching for someword instead of title:someword.
+Enter a list of search/lookup names separated by commas. You
+must check the 'Limit' box on the GUI for this option to take effect.</string>
+     </property>
+    </widget>
+   </item>
    <item row="15" column="0" colspan="2">
     <widget class="QGroupBox" name="groupBox_2">
      <property name="title">

src/calibre/gui2/search_box.py

@@ -16,7 +16,7 @@ from calibre.gui2 import config
 from calibre.gui2.dialogs.confirm_delete import confirm
 from calibre.gui2.dialogs.saved_search_editor import SavedSearchEditor
 from calibre.gui2.dialogs.search import SearchDialog
-from calibre.utils.config import dynamic
+from calibre.utils.config import dynamic, prefs
 from calibre.utils.search_query_parser import saved_searches
 from calibre.utils.icu import sort_key
 
@@ -379,6 +379,12 @@ class SearchBoxMixin(object): # {{{
         self.search_highlight_only.stateChanged.connect(self.highlight_only_changed)
         self.search_highlight_only.setChecked(
                             dynamic.get('search_highlight_only', False))
+        self.search_limit_to.stateChanged.connect(self.search_limit_to_changed)
+        self.search_limit_to.setVisible(True)
+        chk = dynamic.get('use_search_box_limit', False)
+        self.search_limit_to.setChecked(chk)
+        prefs['use_search_box_limit'] = chk
+        self.search_limit_to.setEnabled(bool(prefs['search_box_limit_to']))
 
     def focus_search_box(self, *args):
         self.search.setFocus(Qt.OtherFocusReason)
@@ -410,6 +416,11 @@ class SearchBoxMixin(object): # {{{
         self.current_view().model().set_highlight_only(toWhat)
         self.focus_to_library()
 
+    def search_limit_to_changed(self, toWhat):
+        dynamic.set('use_search_box_limit', toWhat)
+        prefs['use_search_box_limit'] = toWhat
+        self.search.do_search()
+
     # }}}
 
 class SavedSearchBoxMixin(object): # {{{

src/calibre/gui2/tag_view.py

@@ -1214,7 +1214,7 @@ class TagBrowserMixin(object): # {{{
             db.field_metadata.remove_user_categories()
             for k in d.categories:
                 db.field_metadata.add_user_category('@' + k, k)
-            db.data.sqp_change_locations(db.field_metadata.get_search_terms())
+            db.data.change_search_locations(db.field_metadata.get_search_terms())
             self.tags_view.set_new_model()
             self.tags_view.recount()
 

src/calibre/gui2/ui.py

@@ -482,8 +482,10 @@ class Main(MainWindow, MainWindowMixin, DeviceMixin, EmailMixin, # {{{
         for action in self.iactions.values():
             action.location_selected(location)
         if location == 'library':
+            self.search_limit_to.setVisible(True)
             self.search_restriction.setEnabled(True)
         else:
+            self.search_limit_to.setVisible(False)
             self.search_restriction.setEnabled(False)
             # Reset the view in case something changed while it was invisible
             self.current_view().reset()

src/calibre/library/caches.py

@@ -11,7 +11,7 @@ from itertools import repeat
 from datetime import timedelta
 from threading import Thread
 
-from calibre.utils.config import tweaks
+from calibre.utils.config import tweaks, prefs
 from calibre.utils.date import parse_date, now, UNDEFINED_DATE
 from calibre.utils.search_query_parser import SearchQueryParser
 from calibre.utils.pyparsing import ParseException
@@ -182,15 +182,16 @@ class ResultCache(SearchQueryParser): # {{{
         self.first_sort = True
         self.search_restriction = ''
         self.field_metadata = field_metadata
-        all_search_locations = field_metadata.get_search_terms()
-        SearchQueryParser.__init__(self, all_search_locations, optimize=True)
+        self.all_search_locations = field_metadata.get_search_terms()
+        SearchQueryParser.__init__(self, self.all_search_locations, optimize=True)
         self.build_date_relop_dict()
         self.build_numeric_relop_dict()
 
     def break_cycles(self):
         self._data = self.field_metadata = self.FIELD_MAP = \
             self.numeric_search_relops = self.date_search_relops = \
-            self.db_prefs = None
+            self.db_prefs = self.all_search_locations = None
+        self.sqp_change_locations([])
 
 
     def __getitem__(self, row):
@@ -218,6 +219,10 @@ class ResultCache(SearchQueryParser): # {{{
     def universal_set(self):
         return set([i[0] for i in self._data if i is not None])
 
+    def change_search_locations(self, locations):
+        self.sqp_change_locations(locations)
+        self.all_search_locations = locations
+
     def build_date_relop_dict(self):
         '''
         Because the database dates have time in them, we can't use direct
@@ -432,6 +437,7 @@ class ResultCache(SearchQueryParser): # {{{
             # get metadata key associated with the search term. Eliminates
             # dealing with plurals and other aliases
             location = self.field_metadata.search_term_to_field_key(icu_lower(location.strip()))
+            # grouped search terms
             if isinstance(location, list):
                 if allow_recursion:
                     for loc in location:
@@ -440,6 +446,20 @@ class ResultCache(SearchQueryParser): # {{{
                     return matches
                 raise ParseException(query, len(query), 'Recursive query group detected', self)
 
+            # apply the limit if appropriate
+            if location == 'all' and prefs['use_search_box_limit'] and \
+                            prefs['search_box_limit_to']:
+                for l in prefs['search_box_limit_to'].split(','):
+                    l = icu_lower(l.strip())
+                    if not l or l == 'all':
+                        continue
+                    if l not in self.all_search_locations:
+                        raise ParseException(l, len(l),
+                            'Unknown field "%s" in search column limit'%l, self)
+                    matches |= self.get_matches(l, query,
+                        candidates=candidates, allow_recursion=allow_recursion)
+                return matches
+
             if location in self.field_metadata:
                 fm = self.field_metadata[location]
                 # take care of dates special case

src/calibre/utils/config.py

@@ -729,6 +729,11 @@ def _prefs():
     c.add_opt('manage_device_metadata', default='manual',
         help=_('How and when calibre updates metadata on the device.'))
 
+    c.add_opt('search_box_limit_to', default='',
+              help=_('Comma-separated list of fields to search when no prefix'))
+    c.add_opt('use_search_box_limit', default=False,
+              help=_('Set to true to apply the search box limit'))
+
     c.add_opt('migrated', default=False, help='For Internal use. Don\'t modify.')
     return c