Enhancement #8033: Sony collection name format changes

resources/default_tweaks.py

@@ -135,32 +135,53 @@ auto_connect_to_folder = ''
 # metadata management is set to automatic. Collections on Sonys are named
 # depending upon whether the field is standard or custom. A collection derived
 # from a standard field is named for the value in that field. For example, if
-# the standard 'series' column contains the name 'Darkover', then the series
-# will be named 'Darkover'. A collection derived from a custom field will have
-# the name of the field added to the value. For example, if a custom series
+# the standard 'series' column contains the value 'Darkover', then the
+# collection name is 'Darkover'. A collection derived from a custom field will
+# have the name of the field added to the value. For example, if a custom series
 # column named 'My Series' contains the name 'Darkover', then the collection
-# will be named 'Darkover (My Series)'. If two books have fields that generate
-# the same collection name, then both books will be in that collection. This
-# tweak lets you specify for a standard or custom field the value to be put
-# inside the parentheses. You can use it to add a parenthetical description to a
+# will by default be named 'Darkover (My Series)'. For purposes of this
+# documentation, 'Darkover' is called the value and 'My Series' is called the
+# category. If two books have fields that generate the same collection name,
+# then both books will be in that collection.
+# This set of tweaks tweak lets you specify for a standard or custom field how
+# the collections are to be named. You can use it to add a description to a
 # standard field, for example 'Foo (Tag)' instead of the 'Foo'. You can also use
 # it to force multiple fields to end up in the same collection. For example, you
 # could force the values in 'series', '#my_series_1', and '#my_series_2' to
 # appear in collections named 'some_value (Series)', thereby merging all of the
-# fields into one set of collections. The syntax of this tweak is
-# {'field_lookup_name':'name_to_use', 'lookup_name':'name', ...}
-# Example 1: I want three series columns to be merged into one set of
-# collections. If the column lookup names are 'series', '#series_1' and
-# '#series_2', and if I want nothing in the parenthesis, then the value to use
-# in the tweak value would be:
+# fields into one set of collections.
+# There are two related tweaks. The first determines the category name to use
+# for a metadata field.  The second is a template, used to determines how the
+# value and category are combined to create the collection name.
+# The syntax of the first tweak, sony_collection_renaming_rules, is:
+# {'field_lookup_name':'category_name_to_use', 'lookup_name':'name', ...}
+# The second tweak, sony_collection_name_template, is a template. It uses the
+# same template language as plugboards and save templates. This tweak controls
+# how the value and category are combined together to make the collection name.
+# The only two fields available are {category} and {value}. The {value} field is
+# never empty. The {category} field can be empty. The default is to put the
+# value first, then the category enclosed in parentheses, it is isn't empty:
+# '{value} {category:|(|)}'
+# Examples: The first three examples assume that the second tweak
+# has not been changed.
+# 1: I want three series columns to be merged into one set of collections. The
+# column lookup names are 'series', '#series_1' and '#series_2'. I want nothing
+# in the parenthesis. The value to use in the tweak value would be:
 #    sony_collection_renaming_rules={'series':'', '#series_1':'', '#series_2':''}
-# Example 2: I want the word '(Series)' to appear on collections made from
-# series, and the word '(Tag)' to appear on collections made from tags. Use:
+# 2: I want the word '(Series)' to appear on collections made from series, and
+# the word '(Tag)' to appear on collections made from tags. Use:
 #    sony_collection_renaming_rules={'series':'Series', 'tags':'Tag'}
-# Example 3: I want 'series' and '#myseries' to be merged, and for the
-# collection name to have '(Series)' appended. The renaming rule is:
+# 3: I want 'series' and '#myseries' to be merged, and for the collection name
+# to have '(Series)' appended. The renaming rule is:
 #    sony_collection_renaming_rules={'series':'Series', '#myseries':'Series'}
+# 4: Same as example 2, but instead of having the category name in parentheses
+# and appended to the value, I want it prepended and separated by a colon, such
+# as in Series: Darkover. I must change the template used to format the category name
+# The resulting two tweaks are:
+#    sony_collection_renaming_rules={'series':'Series', 'tags':'Tag'}
+#    sony_collection_name_template='{category:||: }{value}'
 sony_collection_renaming_rules={}
+sony_collection_name_template='{value}{category:| (|)}'
 
 
 # Specify how sony collections are sorted. This tweak is only applicable if

src/calibre/devices/usbms/books.py

@@ -14,6 +14,22 @@ from calibre.constants import preferred_encoding
 from calibre import isbytestring, force_unicode
 from calibre.utils.config import prefs, tweaks
 from calibre.utils.icu import strcmp
+from calibre.utils.formatter import TemplateFormatter
+
+class SafeFormat(TemplateFormatter):
+    '''
+    Provides a format function that substitutes '' for any missing value
+    '''
+
+    def get_value(self, key, args, kwargs):
+        try:
+            if key in kwargs:
+                return kwargs[key]
+            return key
+        except:
+            return key
+
+safe_formatter = SafeFormat()
 
 class Book(Metadata):
     def __init__(self, prefix, lpath, size=None, other=None):
@@ -107,23 +123,25 @@ class CollectionsBookList(BookList):
                 return sortattr
         return None
 
-    def compute_category_name(self, attr, category, field_meta):
+    def compute_category_name(self, field_key, field_value, field_meta):
         renames = tweaks['sony_collection_renaming_rules']
-        attr_name = renames.get(attr, None)
-        if attr_name is None:
+        field_name = renames.get(field_key, None)
+        if field_name is None:
             if field_meta['is_custom']:
-                attr_name = '(%s)'%field_meta['name']
+                field_name = field_meta['name']
             else:
-                attr_name = ''
-        elif attr_name != '':
-            attr_name = '(%s)'%attr_name
-        cat_name = '%s %s'%(category, attr_name)
+                field_name = ''
+        cat_name = safe_formatter.safe_format(
+                        fmt=tweaks['sony_collection_name_template'],
+                        kwargs={'category':field_name, 'value':field_value},
+                        error_value='', book=None)
         return cat_name.strip()
 
     def get_collections(self, collection_attributes):
         from calibre.devices.usbms.driver import debug_print
         debug_print('Starting get_collections:', prefs['manage_device_metadata'])
         debug_print('Renaming rules:', tweaks['sony_collection_renaming_rules'])
+        debug_print('Formatting template:', tweaks['sony_collection_name_template'])
         debug_print('Sorting rules:', tweaks['sony_collection_sorting_rules'])
 
         # Complexity: we can use renaming rules only when using automatic