Make searches in the tag browser a possible hierarchical field.

src/calibre/gui2/dialogs/saved_search_editor.py

@@ -9,12 +9,13 @@ from PyQt4.QtGui import QDialog
 from calibre.gui2.dialogs.saved_search_editor_ui import Ui_SavedSearchEditor
 from calibre.utils.search_query_parser import saved_searches
 from calibre.utils.icu import sort_key
+from calibre.gui2 import error_dialog
 from calibre.gui2.dialogs.confirm_delete import confirm
 
 class SavedSearchEditor(QDialog, Ui_SavedSearchEditor):
 
-    def __init__(self, window, initial_search=None):
+    def __init__(self, parent, initial_search=None):
-        QDialog.__init__(self, window)
+        QDialog.__init__(self, parent)
         Ui_SavedSearchEditor.__init__(self)
         self.setupUi(self)
 
@@ -22,12 +23,13 @@ class SavedSearchEditor(QDialog, Ui_SavedSearchEditor):
         self.connect(self.search_name_box, SIGNAL('currentIndexChanged(int)'),
                                     self.current_index_changed)
         self.connect(self.delete_search_button, SIGNAL('clicked()'), self.del_search)
+        self.rename_button.clicked.connect(self.rename_search)
 
         self.current_search_name = None
         self.searches = {}
-        self.searches_to_delete = []
         for name in saved_searches().names():
             self.searches[name] = saved_searches().lookup(name)
+        self.search_names = set([icu_lower(n) for n in saved_searches().names()])
 
         self.populate_search_list()
         if initial_search is not None and initial_search in self.searches:
@@ -42,6 +44,11 @@ class SavedSearchEditor(QDialog, Ui_SavedSearchEditor):
         search_name = unicode(self.input_box.text()).strip()
         if search_name == '':
             return False
+        if icu_lower(search_name) in self.search_names:
+            error_dialog(self, _('Saved search already exists'),
+                     _('The saved search %s already exists, perhaps with '
+                       'different case')%search_name).exec_()
+            return False
         if search_name not in self.searches:
             self.searches[search_name] = ''
             self.populate_search_list()
@@ -57,10 +64,25 @@ class SavedSearchEditor(QDialog, Ui_SavedSearchEditor):
                         +'</p>', 'saved_search_editor_delete', self):
                 return
             del self.searches[self.current_search_name]
-            self.searches_to_delete.append(self.current_search_name)
             self.current_search_name = None
             self.search_name_box.removeItem(self.search_name_box.currentIndex())
 
+    def rename_search(self):
+        new_search_name = unicode(self.input_box.text()).strip()
+        if new_search_name == '':
+            return False
+        if icu_lower(new_search_name) in self.search_names:
+            error_dialog(self, _('Saved search already exists'),
+                    _('The saved search %s already exists, perhaps with '
+                      'different case')%new_search_name).exec_()
+            return False
+        if self.current_search_name in self.searches:
+            self.searches[new_search_name] = self.searches[self.current_search_name]
+            del self.searches[self.current_search_name]
+            self.populate_search_list()
+            self.select_search(new_search_name)
+        return True
+
     def select_search(self, name):
         self.search_name_box.setCurrentIndex(self.search_name_box.findText(name))
 
@@ -78,7 +100,7 @@ class SavedSearchEditor(QDialog, Ui_SavedSearchEditor):
     def accept(self):
         if self.current_search_name:
             self.searches[self.current_search_name] = unicode(self.search_text.toPlainText())
-        for name in self.searches_to_delete:
+        for name in saved_searches().names():
             saved_searches().delete(name)
         for name in self.searches:
             saved_searches().add(name, self.searches[name])

src/calibre/gui2/dialogs/saved_search_editor.ui

@@ -134,6 +134,20 @@
        </property>
       </widget>
      </item>
+     <item row="0" column="6">
+      <widget class="QToolButton" name="rename_button">
+       <property name="toolTip">
+        <string>Rename the current search to what is in the box</string>
+       </property>
+       <property name="text">
+        <string>...</string>
+       </property>
+       <property name="icon">
+        <iconset>
+         <normaloff>:/images/edit-undo.png</normaloff>:/images/edit-undo.png</iconset>
+       </property>
+      </widget>
+     </item>
     </layout>
    </item>
    <item row="1" column="0">

src/calibre/gui2/preferences/look_feel.py

@@ -67,6 +67,7 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
                     if db.field_metadata[k]['is_category'] and
                        db.field_metadata[k]['datatype'] in ['text', 'series', 'enumeration']])
         choices -= set(['authors', 'publisher', 'formats', 'news', 'identifiers'])
+        choices |= set(['search'])
         self.opt_categories_using_hierarchy.update_items_cache(choices)
         r('categories_using_hierarchy', db.prefs, setting=CommaSeparatedList,
           choices=sorted(list(choices), key=sort_key))

src/calibre/gui2/tag_view.py

@@ -533,7 +533,9 @@ class TagsView(QTreeView): # {{{
             self.setModel(self._model)
         except:
             # The DB must be gone. Set the model to None and hope that someone
-            # will call set_database later. I don't know if this in fact works
+            # will call set_database later. I don't know if this in fact works.
+            # But perhaps a Bad Thing Happened, so print the exception
+            traceback.print_exc()
             self._model = None
             self.setModel(None)
     # }}}
@@ -678,7 +680,8 @@ class TagTreeItem(object): # {{{
                         break
                 elif self.tag.state == TAG_SEARCH_STATES['mark_plusplus'] or\
                         self.tag.state == TAG_SEARCH_STATES['mark_minusminus']:
-                    if self.tag.is_hierarchical and len(self.children):
+                    if self.tag.is_searchable and self.tag.is_hierarchical \
+                                and len(self.children):
                         break
                 else:
                     break
@@ -1258,19 +1261,22 @@ class TagsModel(QAbstractItemModel): # {{{
                                             if t.type != TagTreeItem.CATEGORY])
                         if (comp,tag.category) in child_map:
                             node_parent = child_map[(comp,tag.category)]
-                            node_parent.tag.is_hierarchical = True
+                            node_parent.tag.is_hierarchical = key != 'search'
                         else:
                             if i < len(components)-1:
                                 t = copy.copy(tag)
                                 t.original_name = '.'.join(components[:i+1])
+                                if key != 'search':
                                     # This 'manufactured' intermediate node can
                                     # be searched, but cannot be edited.
                                     t.is_editable = False
+                                else:
+                                    t.is_searchable = t.is_editable = False
                             else:
                                 t = tag
                                 if not in_uc:
                                     t.original_name = t.name
-                            t.is_hierarchical = True
+                            t.is_hierarchical = key != 'search'
                             t.name = comp
                             self.beginInsertRows(category_index, 999999, 1)
                             node_parent = TagTreeItem(parent=node_parent, data=t,

src/calibre/library/database2.py

@@ -56,7 +56,7 @@ class Tag(object):
         self.is_hierarchical = False
         self.is_editable = is_editable
         self.is_searchable = is_searchable
-        self.id_set = id_set
+        self.id_set = id_set if id_set is not None else set([])
         self.avg_rating = avg/2.0 if avg is not None else 0
         self.sort = sort
         if self.avg_rating > 0: