1) Make hierarchies display as complete tags in user categories.

2) Add a sublist template function for slicing names apart.

src/calibre/gui2/tag_view.py

@@ -515,6 +515,12 @@ class TagTreeItem(object): # {{{
                 tweaks['categories_use_field_for_author_name'] == 'author_sort':
             name = tag.sort
             tt_author = True
+        else:
+            p = self
+            while p.parent.type != self.ROOT:
+                p = p.parent
+            if p.category_key.startswith('@'):
+                name = getattr(tag, 'original_name', tag.name)
             else:
                 name = tag.name
             tt_author = False
@@ -903,18 +909,19 @@ class TagsModel(QAbstractItemModel): # {{{
                     node_parent = category
 
                 components = [t for t in tag.name.split('.')]
-                if key in ['authors', 'publisher', 'title'] or len(components) == 1:
+                if key in ['authors', 'publisher', 'title'] or len(components) == 1 or \
+                        self.db.field_metadata[key]['kind'] == 'user':
                     self.beginInsertRows(category_index, 999999, 1)
                     TagTreeItem(parent=node_parent, data=tag, tooltip=tt,
                                     icon_map=self.icon_state_map)
                     self.endInsertRows()
                 else:
-                    print components
                     for i,comp in enumerate(components):
-                        children = dict([(t.tag.name, t) for t in node_parent.children
+                        child_map = dict([(t.tag.name, t) for t in node_parent.children
                                             if t.type != TagTreeItem.CATEGORY])
-                        if comp in children:
+                        if comp in child_map:
-                            node_parent = children[comp]
+                            node_parent = child_map[comp]
+                            node_parent.tag.count += tag.count
                         else:
                             if i < len(components)-1:
                                 t = copy.copy(tag)
@@ -934,14 +941,14 @@ class TagsModel(QAbstractItemModel): # {{{
 
         for category in self.category_nodes:
             if len(category.children) > 0:
-                children = category.children
+                child_map = category.children
                 states = [c.tag.state for c in category.child_tags()]
                 names = [(c.tag.name, c.tag.category) for c in category.child_tags()]
                 state_map = dict(izip(names, states))
-                ctags = [c for c in children if c.type == TagTreeItem.CATEGORY]
+                ctags = [c for c in child_map if c.type == TagTreeItem.CATEGORY]
                 start = len(ctags)
                 self.beginRemoveRows(self.createIndex(category.row(), 0, category),
-                                     start, len(children)-1)
+                                     start, len(child_map)-1)
                 category.children = ctags
                 self.endRemoveRows()
             else:

src/calibre/utils/formatter_functions.py

@@ -396,6 +396,34 @@ class BuiltinListitem(BuiltinFormatterFunction):
         except:
             return ''
 
+class BuiltinSublist(BuiltinFormatterFunction):
+    name = 'sublist'
+    arg_count = 4
+    doc = _('sublist(val, start_index, end_index, separator) -- interpret the '
+            ' value as a list of items separated by `separator`, returning a '
+            ' new list made from the `start_index`th to the `end_index`th item. '
+            'The first item is number zero. If an index is negative, then it '
+            'counts from the end of the list. As a special case, an end_index '
+            'of zero is assumed to be the length of the list. Examples using '
+            'basic template mode and assuming a #genre value if A.B.C: '
+            '{#genre:sublist(-1,0,.)} returns C<br/>'
+            '{#genre:sublist(0,1,.)} returns A<br/>'
+            '{#genre:sublist(0,-1,.)} returns A.B')
+
+    def evaluate(self, formatter, kwargs, mi, locals, val, start_index, end_index, sep):
+        if not val:
+            return ''
+        si = int(start_index)
+        ei = int(end_index)
+        val = val.split(sep)
+        try:
+            if ei == 0:
+                return sep.join(val[si:])
+            else:
+                return sep.join(val[si:ei])
+        except:
+            return ''
+
 class BuiltinUppercase(BuiltinFormatterFunction):
     name = 'uppercase'
     arg_count = 1
@@ -447,6 +475,7 @@ builtin_re          = BuiltinRe()
 builtin_shorten     = BuiltinShorten()
 builtin_strcat      = BuiltinStrcat()
 builtin_strcmp      = BuiltinStrcmp()
+builtin_sublist     = BuiltinSublist()
 builtin_substr      = BuiltinSubstr()
 builtin_subtract    = BuiltinSubtract()
 builtin_switch      = BuiltinSwitch()