old_contents: # Copyright (c) 2006, 2007, 2008, 2009, 2010, 2011  Andrey Golovizin
  # 
  # Permission is hereby granted, free of charge, to any person obtaining
  # a copy of this software and associated documentation files (the
  # "Software"), to deal in the Software without restriction, including
  # without limitation the rights to use, copy, modify, merge, publish,
  # distribute, sublicense, and/or sell copies of the Software, and to
  # permit persons to whom the Software is furnished to do so, subject to
  # the following conditions:
  # 
  # The above copyright notice and this permission notice shall be
  # included in all copies or substantial portions of the Software.
  # 
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  # IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  # CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  from pybtex.style.sorting import BaseSortingStyle
  
  
  class SortingStyle(BaseSortingStyle):
      name = 'author'
  
      def sorting_key(self, entry):
          return unicode(entry.persons['author'][0])  # XXX
  
new_contents: # Copyright (c) 2006, 2007, 2008, 2009, 2010, 2011  Andrey Golovizin
  # 
  # Permission is hereby granted, free of charge, to any person obtaining
  # a copy of this software and associated documentation files (the
  # "Software"), to deal in the Software without restriction, including
  # without limitation the rights to use, copy, modify, merge, publish,
  # distribute, sublicense, and/or sell copies of the Software, and to
  # permit persons to whom the Software is furnished to do so, subject to
  # the following conditions:
  # 
  # The above copyright notice and this permission notice shall be
  # included in all copies or substantial portions of the Software.
  # 
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  # IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  # CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  from pybtex.style.sorting import BaseSortingStyle
  
  
  class SortingStyle(BaseSortingStyle):
      name = 'author'
  
      def sorting_key(self, entry):
          return self.persons_key(entry.persons['author'])
  
      def persons_key(self, persons):
          return tuple(self.person_key(person) for person in persons)
  
      def join(self, string_list):
          return tuple(string.lower() for string in string_list)
  
      def person_key(self, person):
          return (
              self.join(person.prelast() + person.last()), 
              self.join(person.first() + person.middle()),
              self.join(person.lineage()),
          )
  
subject: Implement basic sorting by author.